// CodeMirror, copyright (c) by Marijn Haverbeke and others

// Distributed under an MIT license: http://codemirror.net/LICENSE



// This is CodeMirror (http://codemirror.net), a code editor

// implemented in JavaScript on top of the browser's DOM.

//

// You can find some technical background for some of the code below

// at http://marijnhaverbeke.nl/blog/#cm-internals .



(function (global, factory) {

  typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :

  typeof define === 'function' && define.amd ? define(factory) :

  (global.CodeMirror = factory());

}(this, (function () { 'use strict';



// Kludges for bugs and behavior differences that can't be feature

// detected are enabled based on userAgent etc sniffing.

var userAgent = navigator.userAgent

var platform = navigator.platform



var gecko = /gecko\/\d/i.test(userAgent)

var ie_upto10 = /MSIE \d/.test(userAgent)

var ie_11up = /Trident\/(?:[7-9]|\d{2,})\..*rv:(\d+)/.exec(userAgent)

var edge = /Edge\/(\d+)/.exec(userAgent)

var ie = ie_upto10 || ie_11up || edge

var ie_version = ie && (ie_upto10 ? document.documentMode || 6 : +(edge || ie_11up)[1])

var webkit = !edge && /WebKit\//.test(userAgent)

var qtwebkit = webkit && /Qt\/\d+\.\d+/.test(userAgent)

var chrome = !edge && /Chrome\//.test(userAgent)

var presto = /Opera\//.test(userAgent)

var safari = /Apple Computer/.test(navigator.vendor)

var mac_geMountainLion = /Mac OS X 1\d\D([8-9]|\d\d)\D/.test(userAgent)

var phantom = /PhantomJS/.test(userAgent)



var ios = !edge && /AppleWebKit/.test(userAgent) && /Mobile\/\w+/.test(userAgent)

var android = /Android/.test(userAgent)

// This is woefully incomplete. Suggestions for alternative methods welcome.

var mobile = ios || android || /webOS|BlackBerry|Opera Mini|Opera Mobi|IEMobile/i.test(userAgent)

var mac = ios || /Mac/.test(platform)

var chromeOS = /\bCrOS\b/.test(userAgent)

var windows = /win/i.test(platform)



var presto_version = presto && userAgent.match(/Version\/(\d*\.\d*)/)

if (presto_version) { presto_version = Number(presto_version[1]) }

if (presto_version && presto_version >= 15) { presto = false; webkit = true }

// Some browsers use the wrong event properties to signal cmd/ctrl on OS X

var flipCtrlCmd = mac && (qtwebkit || presto && (presto_version == null || presto_version < 12.11))

var captureRightClick = gecko || (ie && ie_version >= 9)



function classTest(cls) { return new RegExp("(^|\\s)" + cls + "(?:$|\\s)\\s*") }



var rmClass = function(node, cls) {

  var current = node.className

  var match = classTest(cls).exec(current)

  if (match) {

    var after = current.slice(match.index + match[0].length)

    node.className = current.slice(0, match.index) + (after ? match[1] + after : "")

  }

}



function removeChildren(e) {

  for (var count = e.childNodes.length; count > 0; --count)

    { e.removeChild(e.firstChild) }

  return e

}



function removeChildrenAndAdd(parent, e) {

  return removeChildren(parent).appendChild(e)

}



function elt(tag, content, className, style) {

  var e = document.createElement(tag)

  if (className) { e.className = className }

  if (style) { e.style.cssText = style }

  if (typeof content == "string") { e.appendChild(document.createTextNode(content)) }

  else if (content) { for (var i = 0; i < content.length; ++i) { e.appendChild(content[i]) } }

  return e

}

// wrapper for elt, which removes the elt from the accessibility tree

function eltP(tag, content, className, style) {

  var e = elt(tag, content, className, style)

  e.setAttribute("role", "presentation")

  return e

}



var range

if (document.createRange) { range = function(node, start, end, endNode) {

  var r = document.createRange()

  r.setEnd(endNode || node, end)

  r.setStart(node, start)

  return r

} }

else { range = function(node, start, end) {

  var r = document.body.createTextRange()

  try { r.moveToElementText(node.parentNode) }

  catch(e) { return r }

  r.collapse(true)

  r.moveEnd("character", end)

  r.moveStart("character", start)

  return r

} }



function contains(parent, child) {

  if (child.nodeType == 3) // Android browser always returns false when child is a textnode

    { child = child.parentNode }

  if (parent.contains)

    { return parent.contains(child) }

  do {

    if (child.nodeType == 11) { child = child.host }

    if (child == parent) { return true }

  } while (child = child.parentNode)

}



function activeElt() {

  // IE and Edge may throw an "Unspecified Error" when accessing document.activeElement.

  // IE < 10 will throw when accessed while the page is loading or in an iframe.

  // IE > 9 and Edge will throw when accessed in an iframe if document.body is unavailable.

  var activeElement

  try {

    activeElement = document.activeElement

  } catch(e) {

    activeElement = document.body || null

  }

  while (activeElement && activeElement.shadowRoot && activeElement.shadowRoot.activeElement)

    { activeElement = activeElement.shadowRoot.activeElement }

  return activeElement

}



function addClass(node, cls) {

  var current = node.className

  if (!classTest(cls).test(current)) { node.className += (current ? " " : "") + cls }

}

function joinClasses(a, b) {

  var as = a.split(" ")

  for (var i = 0; i < as.length; i++)

    { if (as[i] && !classTest(as[i]).test(b)) { b += " " + as[i] } }

  return b

}



var selectInput = function(node) { node.select() }

if (ios) // Mobile Safari apparently has a bug where select() is broken.

  { selectInput = function(node) { node.selectionStart = 0; node.selectionEnd = node.value.length } }

else if (ie) // Suppress mysterious IE10 errors

  { selectInput = function(node) { try { node.select() } catch(_e) {} } }



function bind(f) {

  var args = Array.prototype.slice.call(arguments, 1)

  return function(){return f.apply(null, args)}

}



function copyObj(obj, target, overwrite) {

  if (!target) { target = {} }

  for (var prop in obj)

    { if (obj.hasOwnProperty(prop) && (overwrite !== false || !target.hasOwnProperty(prop)))

      { target[prop] = obj[prop] } }

  return target

}



// Counts the column offset in a string, taking tabs into account.

// Used mostly to find indentation.

function countColumn(string, end, tabSize, startIndex, startValue) {

  if (end == null) {

    end = string.search(/[^\s\u00a0]/)

    if (end == -1) { end = string.length }

  }

  for (var i = startIndex || 0, n = startValue || 0;;) {

    var nextTab = string.indexOf("\t", i)

    if (nextTab < 0 || nextTab >= end)

      { return n + (end - i) }

    n += nextTab - i

    n += tabSize - (n % tabSize)

    i = nextTab + 1

  }

}



var Delayed = function() {this.id = null};

Delayed.prototype.set = function (ms, f) {

  clearTimeout(this.id)

  this.id = setTimeout(f, ms)

};



function indexOf(array, elt) {

  for (var i = 0; i < array.length; ++i)

    { if (array[i] == elt) { return i } }

  return -1

}



// Number of pixels added to scroller and sizer to hide scrollbar

var scrollerGap = 30



// Returned or thrown by various protocols to signal 'I'm not

// handling this'.

var Pass = {toString: function(){return "CodeMirror.Pass"}}



// Reused option objects for setSelection & friends

var sel_dontScroll = {scroll: false};

var sel_mouse = {origin: "*mouse"};

var sel_move = {origin: "+move"};

// The inverse of countColumn -- find the offset that corresponds to

// a particular column.

function findColumn(string, goal, tabSize) {

  for (var pos = 0, col = 0;;) {

    var nextTab = string.indexOf("\t", pos)

    if (nextTab == -1) { nextTab = string.length }

    var skipped = nextTab - pos

    if (nextTab == string.length || col + skipped >= goal)

      { return pos + Math.min(skipped, goal - col) }

    col += nextTab - pos

    col += tabSize - (col % tabSize)

    pos = nextTab + 1

    if (col >= goal) { return pos }

  }

}



var spaceStrs = [""]

function spaceStr(n) {

  while (spaceStrs.length <= n)

    { spaceStrs.push(lst(spaceStrs) + " ") }

  return spaceStrs[n]

}



function lst(arr) { return arr[arr.length-1] }



function map(array, f) {

  var out = []

  for (var i = 0; i < array.length; i++) { out[i] = f(array[i], i) }

  return out

}



function insertSorted(array, value, score) {

  var pos = 0, priority = score(value)

  while (pos < array.length && score(array[pos]) <= priority) { pos++ }

  array.splice(pos, 0, value)

}



function nothing() {}



function createObj(base, props) {

  var inst

  if (Object.create) {

    inst = Object.create(base)

  } else {

    nothing.prototype = base

    inst = new nothing()

  }

  if (props) { copyObj(props, inst) }

  return inst

}



var nonASCIISingleCaseWordChar = /[\u00df\u0587\u0590-\u05f4\u0600-\u06ff\u3040-\u309f\u30a0-\u30ff\u3400-\u4db5\u4e00-\u9fcc\uac00-\ud7af]/

function isWordCharBasic(ch) {

  return /\w/.test(ch) || ch > "\x80" &&

    (ch.toUpperCase() != ch.toLowerCase() || nonASCIISingleCaseWordChar.test(ch))

}

function isWordChar(ch, helper) {

  if (!helper) { return isWordCharBasic(ch) }

  if (helper.source.indexOf("\\w") > -1 && isWordCharBasic(ch)) { return true }

  return helper.test(ch)

}



function isEmpty(obj) {

  for (var n in obj) { if (obj.hasOwnProperty(n) && obj[n]) { return false } }

  return true

}



// Extending unicode characters. A series of a non-extending char +

// any number of extending chars is treated as a single unit as far

// as editing and measuring is concerned. This is not fully correct,

// since some scripts/fonts/browsers also treat other configurations

// of code points as a group.

var extendingChars = /[\u0300-\u036f\u0483-\u0489\u0591-\u05bd\u05bf\u05c1\u05c2\u05c4\u05c5\u05c7\u0610-\u061a\u064b-\u065e\u0670\u06d6-\u06dc\u06de-\u06e4\u06e7\u06e8\u06ea-\u06ed\u0711\u0730-\u074a\u07a6-\u07b0\u07eb-\u07f3\u0816-\u0819\u081b-\u0823\u0825-\u0827\u0829-\u082d\u0900-\u0902\u093c\u0941-\u0948\u094d\u0951-\u0955\u0962\u0963\u0981\u09bc\u09be\u09c1-\u09c4\u09cd\u09d7\u09e2\u09e3\u0a01\u0a02\u0a3c\u0a41\u0a42\u0a47\u0a48\u0a4b-\u0a4d\u0a51\u0a70\u0a71\u0a75\u0a81\u0a82\u0abc\u0ac1-\u0ac5\u0ac7\u0ac8\u0acd\u0ae2\u0ae3\u0b01\u0b3c\u0b3e\u0b3f\u0b41-\u0b44\u0b4d\u0b56\u0b57\u0b62\u0b63\u0b82\u0bbe\u0bc0\u0bcd\u0bd7\u0c3e-\u0c40\u0c46-\u0c48\u0c4a-\u0c4d\u0c55\u0c56\u0c62\u0c63\u0cbc\u0cbf\u0cc2\u0cc6\u0ccc\u0ccd\u0cd5\u0cd6\u0ce2\u0ce3\u0d3e\u0d41-\u0d44\u0d4d\u0d57\u0d62\u0d63\u0dca\u0dcf\u0dd2-\u0dd4\u0dd6\u0ddf\u0e31\u0e34-\u0e3a\u0e47-\u0e4e\u0eb1\u0eb4-\u0eb9\u0ebb\u0ebc\u0ec8-\u0ecd\u0f18\u0f19\u0f35\u0f37\u0f39\u0f71-\u0f7e\u0f80-\u0f84\u0f86\u0f87\u0f90-\u0f97\u0f99-\u0fbc\u0fc6\u102d-\u1030\u1032-\u1037\u1039\u103a\u103d\u103e\u1058\u1059\u105e-\u1060\u1071-\u1074\u1082\u1085\u1086\u108d\u109d\u135f\u1712-\u1714\u1732-\u1734\u1752\u1753\u1772\u1773\u17b7-\u17bd\u17c6\u17c9-\u17d3\u17dd\u180b-\u180d\u18a9\u1920-\u1922\u1927\u1928\u1932\u1939-\u193b\u1a17\u1a18\u1a56\u1a58-\u1a5e\u1a60\u1a62\u1a65-\u1a6c\u1a73-\u1a7c\u1a7f\u1b00-\u1b03\u1b34\u1b36-\u1b3a\u1b3c\u1b42\u1b6b-\u1b73\u1b80\u1b81\u1ba2-\u1ba5\u1ba8\u1ba9\u1c2c-\u1c33\u1c36\u1c37\u1cd0-\u1cd2\u1cd4-\u1ce0\u1ce2-\u1ce8\u1ced\u1dc0-\u1de6\u1dfd-\u1dff\u200c\u200d\u20d0-\u20f0\u2cef-\u2cf1\u2de0-\u2dff\u302a-\u302f\u3099\u309a\ua66f-\ua672\ua67c\ua67d\ua6f0\ua6f1\ua802\ua806\ua80b\ua825\ua826\ua8c4\ua8e0-\ua8f1\ua926-\ua92d\ua947-\ua951\ua980-\ua982\ua9b3\ua9b6-\ua9b9\ua9bc\uaa29-\uaa2e\uaa31\uaa32\uaa35\uaa36\uaa43\uaa4c\uaab0\uaab2-\uaab4\uaab7\uaab8\uaabe\uaabf\uaac1\uabe5\uabe8\uabed\udc00-\udfff\ufb1e\ufe00-\ufe0f\ufe20-\ufe26\uff9e\uff9f]/

function isExtendingChar(ch) { return ch.charCodeAt(0) >= 768 && extendingChars.test(ch) }



// Returns a number from the range [`0`; `str.length`] unless `pos` is outside that range.

function skipExtendingChars(str, pos, dir) {

  while ((dir < 0 ? pos > 0 : pos < str.length) && isExtendingChar(str.charAt(pos))) { pos += dir }

  return pos

}



// Returns the value from the range [`from`; `to`] that satisfies

// `pred` and is closest to `from`. Assumes that at least `to`

// satisfies `pred`. Supports `from` being greater than `to`.

function findFirst(pred, from, to) {

  // At any point we are certain `to` satisfies `pred`, don't know

  // whether `from` does.

  var dir = from > to ? -1 : 1

  for (;;) {

    if (from == to) { return from }

    var midF = (from + to) / 2, mid = dir < 0 ? Math.ceil(midF) : Math.floor(midF)

    if (mid == from) { return pred(mid) ? from : to }

    if (pred(mid)) { to = mid }

    else { from = mid + dir }

  }

}



// The display handles the DOM integration, both for input reading

// and content drawing. It holds references to DOM nodes and

// display-related state.



function Display(place, doc, input) {

  var d = this

  this.input = input



  // Covers bottom-right square when both scrollbars are present.

  d.scrollbarFiller = elt("div", null, "CodeMirror-scrollbar-filler")

  d.scrollbarFiller.setAttribute("cm-not-content", "true")

  // Covers bottom of gutter when coverGutterNextToScrollbar is on

  // and h scrollbar is present.

  d.gutterFiller = elt("div", null, "CodeMirror-gutter-filler")

  d.gutterFiller.setAttribute("cm-not-content", "true")

  // Will contain the actual code, positioned to cover the viewport.

  d.lineDiv = eltP("div", null, "CodeMirror-code")

  // Elements are added to these to represent selection and cursors.

  d.selectionDiv = elt("div", null, null, "position: relative; z-index: 1")

  d.cursorDiv = elt("div", null, "CodeMirror-cursors")

  // A visibility: hidden element used to find the size of things.

  d.measure = elt("div", null, "CodeMirror-measure")

  // When lines outside of the viewport are measured, they are drawn in this.

  d.lineMeasure = elt("div", null, "CodeMirror-measure")

  // Wraps everything that needs to exist inside the vertically-padded coordinate system

  d.lineSpace = eltP("div", [d.measure, d.lineMeasure, d.selectionDiv, d.cursorDiv, d.lineDiv],

                    null, "position: relative; outline: none")

  var lines = eltP("div", [d.lineSpace], "CodeMirror-lines")

  // Moved around its parent to cover visible view.

  d.mover = elt("div", [lines], null, "position: relative")

  // Set to the height of the document, allowing scrolling.

  d.sizer = elt("div", [d.mover], "CodeMirror-sizer")

  d.sizerWidth = null

  // Behavior of elts with overflow: auto and padding is

  // inconsistent across browsers. This is used to ensure the

  // scrollable area is big enough.

  d.heightForcer = elt("div", null, null, "position: absolute; height: " + scrollerGap + "px; width: 1px;")

  // Will contain the gutters, if any.

  d.gutters = elt("div", null, "CodeMirror-gutters")

  d.lineGutter = null

  // Actual scrollable element.

  d.scroller = elt("div", [d.sizer, d.heightForcer, d.gutters], "CodeMirror-scroll")

  d.scroller.setAttribute("tabIndex", "-1")

  // The element in which the editor lives.

  d.wrapper = elt("div", [d.scrollbarFiller, d.gutterFiller, d.scroller], "CodeMirror")



  // Work around IE7 z-index bug (not perfect, hence IE7 not really being supported)

  if (ie && ie_version < 8) { d.gutters.style.zIndex = -1; d.scroller.style.paddingRight = 0 }

  if (!webkit && !(gecko && mobile)) { d.scroller.draggable = true }



  if (place) {

    if (place.appendChild) { place.appendChild(d.wrapper) }

    else { place(d.wrapper) }

  }



  // Current rendered range (may be bigger than the view window).

  d.viewFrom = d.viewTo = doc.first

  d.reportedViewFrom = d.reportedViewTo = doc.first

  // Information about the rendered lines.

  d.view = []

  d.renderedView = null

  // Holds info about a single rendered line when it was rendered

  // for measurement, while not in view.

  d.externalMeasured = null

  // Empty space (in pixels) above the view

  d.viewOffset = 0

  d.lastWrapHeight = d.lastWrapWidth = 0

  d.updateLineNumbers = null



  d.nativeBarWidth = d.barHeight = d.barWidth = 0

  d.scrollbarsClipped = false



  // Used to only resize the line number gutter when necessary (when

  // the amount of lines crosses a boundary that makes its width change)

  d.lineNumWidth = d.lineNumInnerWidth = d.lineNumChars = null

  // Set to true when a non-horizontal-scrolling line widget is

  // added. As an optimization, line widget aligning is skipped when

  // this is false.

  d.alignWidgets = false



  d.cachedCharWidth = d.cachedTextHeight = d.cachedPaddingH = null



  // Tracks the maximum line length so that the horizontal scrollbar

  // can be kept static when scrolling.

  d.maxLine = null

  d.maxLineLength = 0

  d.maxLineChanged = false



  // Used for measuring wheel scrolling granularity

  d.wheelDX = d.wheelDY = d.wheelStartX = d.wheelStartY = null



  // True when shift is held down.

  d.shift = false



  // Used to track whether anything happened since the context menu

  // was opened.

  d.selForContextMenu = null



  d.activeTouch = null



  input.init(d)

}



// Find the line object corresponding to the given line number.

function getLine(doc, n) {

  n -= doc.first

  if (n < 0 || n >= doc.size) { throw new Error("There is no line " + (n + doc.first) + " in the document.") }

  var chunk = doc

  while (!chunk.lines) {

    for (var i = 0;; ++i) {

      var child = chunk.children[i], sz = child.chunkSize()

      if (n < sz) { chunk = child; break }

      n -= sz

    }

  }

  return chunk.lines[n]

}



// Get the part of a document between two positions, as an array of

// strings.

function getBetween(doc, start, end) {

  var out = [], n = start.line

  doc.iter(start.line, end.line + 1, function (line) {

    var text = line.text

    if (n == end.line) { text = text.slice(0, end.ch) }

    if (n == start.line) { text = text.slice(start.ch) }

    out.push(text)

    ++n

  })

  return out

}

// Get the lines between from and to, as array of strings.

function getLines(doc, from, to) {

  var out = []

  doc.iter(from, to, function (line) { out.push(line.text) }) // iter aborts when callback returns truthy value

  return out

}



// Update the height of a line, propagating the height change

// upwards to parent nodes.

function updateLineHeight(line, height) {

  var diff = height - line.height

  if (diff) { for (var n = line; n; n = n.parent) { n.height += diff } }

}



// Given a line object, find its line number by walking up through

// its parent links.

function lineNo(line) {

  if (line.parent == null) { return null }

  var cur = line.parent, no = indexOf(cur.lines, line)

  for (var chunk = cur.parent; chunk; cur = chunk, chunk = chunk.parent) {

    for (var i = 0;; ++i) {

      if (chunk.children[i] == cur) { break }

      no += chunk.children[i].chunkSize()

    }

  }

  return no + cur.first

}



// Find the line at the given vertical position, using the height

// information in the document tree.

function lineAtHeight(chunk, h) {

  var n = chunk.first

  outer: do {

    for (var i$1 = 0; i$1 < chunk.children.length; ++i$1) {

      var child = chunk.children[i$1], ch = child.height

      if (h < ch) { chunk = child; continue outer }

      h -= ch

      n += child.chunkSize()

    }

    return n

  } while (!chunk.lines)

  var i = 0

  for (; i < chunk.lines.length; ++i) {

    var line = chunk.lines[i], lh = line.height

    if (h < lh) { break }

    h -= lh

  }

  return n + i

}



function isLine(doc, l) {return l >= doc.first && l < doc.first + doc.size}



function lineNumberFor(options, i) {

  return String(options.lineNumberFormatter(i + options.firstLineNumber))

}



// A Pos instance represents a position within the text.

function Pos(line, ch, sticky) {

  if ( sticky === void 0 ) sticky = null;



  if (!(this instanceof Pos)) { return new Pos(line, ch, sticky) }

  this.line = line

  this.ch = ch

  this.sticky = sticky

}



// Compare two positions, return 0 if they are the same, a negative

// number when a is less, and a positive number otherwise.

function cmp(a, b) { return a.line - b.line || a.ch - b.ch }



function equalCursorPos(a, b) { return a.sticky == b.sticky && cmp(a, b) == 0 }



function copyPos(x) {return Pos(x.line, x.ch)}

function maxPos(a, b) { return cmp(a, b) < 0 ? b : a }

function minPos(a, b) { return cmp(a, b) < 0 ? a : b }



// Most of the external API clips given positions to make sure they

// actually exist within the document.

function clipLine(doc, n) {return Math.max(doc.first, Math.min(n, doc.first + doc.size - 1))}

function clipPos(doc, pos) {

  if (pos.line < doc.first) { return Pos(doc.first, 0) }

  var last = doc.first + doc.size - 1

  if (pos.line > last) { return Pos(last, getLine(doc, last).text.length) }

  return clipToLen(pos, getLine(doc, pos.line).text.length)

}

function clipToLen(pos, linelen) {

  var ch = pos.ch

  if (ch == null || ch > linelen) { return Pos(pos.line, linelen) }

  else if (ch < 0) { return Pos(pos.line, 0) }

  else { return pos }

}

function clipPosArray(doc, array) {

  var out = []

  for (var i = 0; i < array.length; i++) { out[i] = clipPos(doc, array[i]) }

  return out

}



// Optimize some code when these features are not used.

var sawReadOnlySpans = false;

var sawCollapsedSpans = false;

function seeReadOnlySpans() {

  sawReadOnlySpans = true

}



function seeCollapsedSpans() {

  sawCollapsedSpans = true

}



// TEXTMARKER SPANS



function MarkedSpan(marker, from, to) {

  this.marker = marker

  this.from = from; this.to = to

}



// Search an array of spans for a span matching the given marker.

function getMarkedSpanFor(spans, marker) {

  if (spans) { for (var i = 0; i < spans.length; ++i) {

    var span = spans[i]

    if (span.marker == marker) { return span }

  } }

}

// Remove a span from an array, returning undefined if no spans are

// left (we don't store arrays for lines without spans).

function removeMarkedSpan(spans, span) {

  var r

  for (var i = 0; i < spans.length; ++i)

    { if (spans[i] != span) { (r || (r = [])).push(spans[i]) } }

  return r

}

// Add a span to a line.

function addMarkedSpan(line, span) {

  line.markedSpans = line.markedSpans ? line.markedSpans.concat([span]) : [span]

  span.marker.attachLine(line)

}



// Used for the algorithm that adjusts markers for a change in the

// document. These functions cut an array of spans at a given

// character position, returning an array of remaining chunks (or

// undefined if nothing remains).

function markedSpansBefore(old, startCh, isInsert) {

  var nw

  if (old) { for (var i = 0; i < old.length; ++i) {

    var span = old[i], marker = span.marker

    var startsBefore = span.from == null || (marker.inclusiveLeft ? span.from <= startCh : span.from < startCh)

    if (startsBefore || span.from == startCh && marker.type == "bookmark" && (!isInsert || !span.marker.insertLeft)) {

      var endsAfter = span.to == null || (marker.inclusiveRight ? span.to >= startCh : span.to > startCh)

      ;(nw || (nw = [])).push(new MarkedSpan(marker, span.from, endsAfter ? null : span.to))

    }

  } }

  return nw

}

function markedSpansAfter(old, endCh, isInsert) {

  var nw

  if (old) { for (var i = 0; i < old.length; ++i) {

    var span = old[i], marker = span.marker

    var endsAfter = span.to == null || (marker.inclusiveRight ? span.to >= endCh : span.to > endCh)

    if (endsAfter || span.from == endCh && marker.type == "bookmark" && (!isInsert || span.marker.insertLeft)) {

      var startsBefore = span.from == null || (marker.inclusiveLeft ? span.from <= endCh : span.from < endCh)

      ;(nw || (nw = [])).push(new MarkedSpan(marker, startsBefore ? null : span.from - endCh,

                                            span.to == null ? null : span.to - endCh))

    }

  } }

  return nw

}



// Given a change object, compute the new set of marker spans that

// cover the line in which the change took place. Removes spans

// entirely within the change, reconnects spans belonging to the

// same marker that appear on both sides of the change, and cuts off

// spans partially within the change. Returns an array of span

// arrays with one element for each line in (after) the change.

function stretchSpansOverChange(doc, change) {

  if (change.full) { return null }

  var oldFirst = isLine(doc, change.from.line) && getLine(doc, change.from.line).markedSpans

  var oldLast = isLine(doc, change.to.line) && getLine(doc, change.to.line).markedSpans

  if (!oldFirst && !oldLast) { return null }



  var startCh = change.from.ch, endCh = change.to.ch, isInsert = cmp(change.from, change.to) == 0

  // Get the spans that 'stick out' on both sides

  var first = markedSpansBefore(oldFirst, startCh, isInsert)

  var last = markedSpansAfter(oldLast, endCh, isInsert)



  // Next, merge those two ends

  var sameLine = change.text.length == 1, offset = lst(change.text).length + (sameLine ? startCh : 0)

  if (first) {

    // Fix up .to properties of first

    for (var i = 0; i < first.length; ++i) {

      var span = first[i]

      if (span.to == null) {

        var found = getMarkedSpanFor(last, span.marker)

        if (!found) { span.to = startCh }

        else if (sameLine) { span.to = found.to == null ? null : found.to + offset }

      }

    }

  }

  if (last) {

    // Fix up .from in last (or move them into first in case of sameLine)

    for (var i$1 = 0; i$1 < last.length; ++i$1) {

      var span$1 = last[i$1]

      if (span$1.to != null) { span$1.to += offset }

      if (span$1.from == null) {

        var found$1 = getMarkedSpanFor(first, span$1.marker)

        if (!found$1) {

          span$1.from = offset

          if (sameLine) { (first || (first = [])).push(span$1) }

        }

      } else {

        span$1.from += offset

        if (sameLine) { (first || (first = [])).push(span$1) }

      }

    }

  }

  // Make sure we didn't create any zero-length spans

  if (first) { first = clearEmptySpans(first) }

  if (last && last != first) { last = clearEmptySpans(last) }



  var newMarkers = [first]

  if (!sameLine) {

    // Fill gap with whole-line-spans

    var gap = change.text.length - 2, gapMarkers

    if (gap > 0 && first)

      { for (var i$2 = 0; i$2 < first.length; ++i$2)

        { if (first[i$2].to == null)

          { (gapMarkers || (gapMarkers = [])).push(new MarkedSpan(first[i$2].marker, null, null)) } } }

    for (var i$3 = 0; i$3 < gap; ++i$3)

      { newMarkers.push(gapMarkers) }

    newMarkers.push(last)

  }

  return newMarkers

}



// Remove spans that are empty and don't have a clearWhenEmpty

// option of false.

function clearEmptySpans(spans) {

  for (var i = 0; i < spans.length; ++i) {

    var span = spans[i]

    if (span.from != null && span.from == span.to && span.marker.clearWhenEmpty !== false)

      { spans.splice(i--, 1) }

  }

  if (!spans.length) { return null }

  return spans

}



// Used to 'clip' out readOnly ranges when making a change.

function removeReadOnlyRanges(doc, from, to) {

  var markers = null

  doc.iter(from.line, to.line + 1, function (line) {

    if (line.markedSpans) { for (var i = 0; i < line.markedSpans.length; ++i) {

      var mark = line.markedSpans[i].marker

      if (mark.readOnly && (!markers || indexOf(markers, mark) == -1))

        { (markers || (markers = [])).push(mark) }

    } }

  })

  if (!markers) { return null }

  var parts = [{from: from, to: to}]

  for (var i = 0; i < markers.length; ++i) {

    var mk = markers[i], m = mk.find(0)

    for (var j = 0; j < parts.length; ++j) {

      var p = parts[j]

      if (cmp(p.to, m.from) < 0 || cmp(p.from, m.to) > 0) { continue }

      var newParts = [j, 1], dfrom = cmp(p.from, m.from), dto = cmp(p.to, m.to)

      if (dfrom < 0 || !mk.inclusiveLeft && !dfrom)

        { newParts.push({from: p.from, to: m.from}) }

      if (dto > 0 || !mk.inclusiveRight && !dto)

        { newParts.push({from: m.to, to: p.to}) }

      parts.splice.apply(parts, newParts)

      j += newParts.length - 3

    }

  }

  return parts

}



// Connect or disconnect spans from a line.

function detachMarkedSpans(line) {

  var spans = line.markedSpans

  if (!spans) { return }

  for (var i = 0; i < spans.length; ++i)

    { spans[i].marker.detachLine(line) }

  line.markedSpans = null

}

function attachMarkedSpans(line, spans) {

  if (!spans) { return }

  for (var i = 0; i < spans.length; ++i)

    { spans[i].marker.attachLine(line) }

  line.markedSpans = spans

}



// Helpers used when computing which overlapping collapsed span

// counts as the larger one.

function extraLeft(marker) { return marker.inclusiveLeft ? -1 : 0 }

function extraRight(marker) { return marker.inclusiveRight ? 1 : 0 }



// Returns a number indicating which of two overlapping collapsed

// spans is larger (and thus includes the other). Falls back to

// comparing ids when the spans cover exactly the same range.

function compareCollapsedMarkers(a, b) {

  var lenDiff = a.lines.length - b.lines.length

  if (lenDiff != 0) { return lenDiff }

  var aPos = a.find(), bPos = b.find()

  var fromCmp = cmp(aPos.from, bPos.from) || extraLeft(a) - extraLeft(b)

  if (fromCmp) { return -fromCmp }

  var toCmp = cmp(aPos.to, bPos.to) || extraRight(a) - extraRight(b)

  if (toCmp) { return toCmp }

  return b.id - a.id

}



// Find out whether a line ends or starts in a collapsed span. If

// so, return the marker for that span.

function collapsedSpanAtSide(line, start) {

  var sps = sawCollapsedSpans && line.markedSpans, found

  if (sps) { for (var sp = (void 0), i = 0; i < sps.length; ++i) {

    sp = sps[i]

    if (sp.marker.collapsed && (start ? sp.from : sp.to) == null &&

        (!found || compareCollapsedMarkers(found, sp.marker) < 0))

      { found = sp.marker }

  } }

  return found

}

function collapsedSpanAtStart(line) { return collapsedSpanAtSide(line, true) }

function collapsedSpanAtEnd(line) { return collapsedSpanAtSide(line, false) }



// Test whether there exists a collapsed span that partially

// overlaps (covers the start or end, but not both) of a new span.

// Such overlap is not allowed.

function conflictingCollapsedRange(doc, lineNo, from, to, marker) {

  var line = getLine(doc, lineNo)

  var sps = sawCollapsedSpans && line.markedSpans

  if (sps) { for (var i = 0; i < sps.length; ++i) {

    var sp = sps[i]

    if (!sp.marker.collapsed) { continue }

    var found = sp.marker.find(0)

    var fromCmp = cmp(found.from, from) || extraLeft(sp.marker) - extraLeft(marker)

    var toCmp = cmp(found.to, to) || extraRight(sp.marker) - extraRight(marker)

    if (fromCmp >= 0 && toCmp <= 0 || fromCmp <= 0 && toCmp >= 0) { continue }

    if (fromCmp <= 0 && (sp.marker.inclusiveRight && marker.inclusiveLeft ? cmp(found.to, from) >= 0 : cmp(found.to, from) > 0) ||

        fromCmp >= 0 && (sp.marker.inclusiveRight && marker.inclusiveLeft ? cmp(found.from, to) <= 0 : cmp(found.from, to) < 0))

      { return true }

  } }

}



// A visual line is a line as drawn on the screen. Folding, for

// example, can cause multiple logical lines to appear on the same

// visual line. This finds the start of the visual line that the

// given line is part of (usually that is the line itself).

function visualLine(line) {

  var merged

  while (merged = collapsedSpanAtStart(line))

    { line = merged.find(-1, true).line }

  return line

}



function visualLineEnd(line) {

  var merged

  while (merged = collapsedSpanAtEnd(line))

    { line = merged.find(1, true).line }

  return line

}



// Returns an array of logical lines that continue the visual line

// started by the argument, or undefined if there are no such lines.

function visualLineContinued(line) {

  var merged, lines

  while (merged = collapsedSpanAtEnd(line)) {

    line = merged.find(1, true).line

    ;(lines || (lines = [])).push(line)

  }

  return lines

}



// Get the line number of the start of the visual line that the

// given line number is part of.

function visualLineNo(doc, lineN) {

  var line = getLine(doc, lineN), vis = visualLine(line)

  if (line == vis) { return lineN }

  return lineNo(vis)

}



// Get the line number of the start of the next visual line after

// the given line.

function visualLineEndNo(doc, lineN) {

  if (lineN > doc.lastLine()) { return lineN }

  var line = getLine(doc, lineN), merged

  if (!lineIsHidden(doc, line)) { return lineN }

  while (merged = collapsedSpanAtEnd(line))

    { line = merged.find(1, true).line }

  return lineNo(line) + 1

}



// Compute whether a line is hidden. Lines count as hidden when they

// are part of a visual line that starts with another line, or when

// they are entirely covered by collapsed, non-widget span.

function lineIsHidden(doc, line) {

  var sps = sawCollapsedSpans && line.markedSpans

  if (sps) { for (var sp = (void 0), i = 0; i < sps.length; ++i) {

    sp = sps[i]

    if (!sp.marker.collapsed) { continue }

    if (sp.from == null) { return true }

    if (sp.marker.widgetNode) { continue }

    if (sp.from == 0 && sp.marker.inclusiveLeft && lineIsHiddenInner(doc, line, sp))

      { return true }

  } }

}

function lineIsHiddenInner(doc, line, span) {

  if (span.to == null) {

    var end = span.marker.find(1, true)

    return lineIsHiddenInner(doc, end.line, getMarkedSpanFor(end.line.markedSpans, span.marker))

  }

  if (span.marker.inclusiveRight && span.to == line.text.length)

    { return true }

  for (var sp = (void 0), i = 0; i < line.markedSpans.length; ++i) {

    sp = line.markedSpans[i]

    if (sp.marker.collapsed && !sp.marker.widgetNode && sp.from == span.to &&

        (sp.to == null || sp.to != span.from) &&

        (sp.marker.inclusiveLeft || span.marker.inclusiveRight) &&

        lineIsHiddenInner(doc, line, sp)) { return true }

  }

}



// Find the height above the given line.

function heightAtLine(lineObj) {

  lineObj = visualLine(lineObj)



  var h = 0, chunk = lineObj.parent

  for (var i = 0; i < chunk.lines.length; ++i) {

    var line = chunk.lines[i]

    if (line == lineObj) { break }

    else { h += line.height }

  }

  for (var p = chunk.parent; p; chunk = p, p = chunk.parent) {

    for (var i$1 = 0; i$1 < p.children.length; ++i$1) {

      var cur = p.children[i$1]

      if (cur == chunk) { break }

      else { h += cur.height }

    }

  }

  return h

}



// Compute the character length of a line, taking into account

// collapsed ranges (see markText) that might hide parts, and join

// other lines onto it.

function lineLength(line) {

  if (line.height == 0) { return 0 }

  var len = line.text.length, merged, cur = line

  while (merged = collapsedSpanAtStart(cur)) {

    var found = merged.find(0, true)

    cur = found.from.line

    len += found.from.ch - found.to.ch

  }

  cur = line

  while (merged = collapsedSpanAtEnd(cur)) {

    var found$1 = merged.find(0, true)

    len -= cur.text.length - found$1.from.ch

    cur = found$1.to.line

    len += cur.text.length - found$1.to.ch

  }

  return len

}



// Find the longest line in the document.

function findMaxLine(cm) {

  var d = cm.display, doc = cm.doc

  d.maxLine = getLine(doc, doc.first)

  d.maxLineLength = lineLength(d.maxLine)

  d.maxLineChanged = true

  doc.iter(function (line) {

    var len = lineLength(line)

    if (len > d.maxLineLength) {

      d.maxLineLength = len

      d.maxLine = line

    }

  })

}



// BIDI HELPERS



function iterateBidiSections(order, from, to, f) {

  if (!order) { return f(from, to, "ltr", 0) }

  var found = false

  for (var i = 0; i < order.length; ++i) {

    var part = order[i]

    if (part.from < to && part.to > from || from == to && part.to == from) {

      f(Math.max(part.from, from), Math.min(part.to, to), part.level == 1 ? "rtl" : "ltr", i)

      found = true

    }

  }

  if (!found) { f(from, to, "ltr") }

}



var bidiOther = null

function getBidiPartAt(order, ch, sticky) {

  var found

  bidiOther = null

  for (var i = 0; i < order.length; ++i) {

    var cur = order[i]

    if (cur.from < ch && cur.to > ch) { return i }

    if (cur.to == ch) {

      if (cur.from != cur.to && sticky == "before") { found = i }

      else { bidiOther = i }

    }

    if (cur.from == ch) {

      if (cur.from != cur.to && sticky != "before") { found = i }

      else { bidiOther = i }

    }

  }

  return found != null ? found : bidiOther

}



// Bidirectional ordering algorithm

// See http://unicode.org/reports/tr9/tr9-13.html for the algorithm

// that this (partially) implements.



// One-char codes used for character types:

// L (L):   Left-to-Right

// R (R):   Right-to-Left

// r (AL):  Right-to-Left Arabic

// 1 (EN):  European Number

// + (ES):  European Number Separator

// % (ET):  European Number Terminator

// n (AN):  Arabic Number

// , (CS):  Common Number Separator

// m (NSM): Non-Spacing Mark

// b (BN):  Boundary Neutral

// s (B):   Paragraph Separator

// t (S):   Segment Separator

// w (WS):  Whitespace

// N (ON):  Other Neutrals



// Returns null if characters are ordered as they appear

// (left-to-right), or an array of sections ({from, to, level}

// objects) in the order in which they occur visually.

var bidiOrdering = (function() {

  // Character types for codepoints 0 to 0xff

  var lowTypes = "bbbbbbbbbtstwsbbbbbbbbbbbbbbssstwNN%%%NNNNNN,N,N1111111111NNNNNNNLLLLLLLLLLLLLLLLLLLLLLLLLLNNNNNNLLLLLLLLLLLLLLLLLLLLLLLLLLNNNNbbbbbbsbbbbbbbbbbbbbbbbbbbbbbbbbb,N%%%%NNNNLNNNNN%%11NLNNN1LNNNNNLLLLLLLLLLLLLLLLLLLLLLLNLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLN"

  // Character types for codepoints 0x600 to 0x6f9

  var arabicTypes = "nnnnnnNNr%%r,rNNmmmmmmmmmmmrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrmmmmmmmmmmmmmmmmmmmmmnnnnnnnnnn%nnrrrmrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrmmmmmmmnNmmmmmmrrmmNmmmmrr1111111111"

  function charType(code) {

    if (code <= 0xf7) { return lowTypes.charAt(code) }

    else if (0x590 <= code && code <= 0x5f4) { return "R" }

    else if (0x600 <= code && code <= 0x6f9) { return arabicTypes.charAt(code - 0x600) }

    else if (0x6ee <= code && code <= 0x8ac) { return "r" }

    else if (0x2000 <= code && code <= 0x200b) { return "w" }

    else if (code == 0x200c) { return "b" }

    else { return "L" }

  }



  var bidiRE = /[\u0590-\u05f4\u0600-\u06ff\u0700-\u08ac]/

  var isNeutral = /[stwN]/, isStrong = /[LRr]/, countsAsLeft = /[Lb1n]/, countsAsNum = /[1n]/



  function BidiSpan(level, from, to) {

    this.level = level

    this.from = from; this.to = to

  }



  return function(str, direction) {

    var outerType = direction == "ltr" ? "L" : "R"



    if (str.length == 0 || direction == "ltr" && !bidiRE.test(str)) { return false }

    var len = str.length, types = []

    for (var i = 0; i < len; ++i)

      { types.push(charType(str.charCodeAt(i))) }



    // W1. Examine each non-spacing mark (NSM) in the level run, and

    // change the type of the NSM to the type of the previous

    // character. If the NSM is at the start of the level run, it will

    // get the type of sor.

    for (var i$1 = 0, prev = outerType; i$1 < len; ++i$1) {

      var type = types[i$1]

      if (type == "m") { types[i$1] = prev }

      else { prev = type }

    }



    // W2. Search backwards from each instance of a European number

    // until the first strong type (R, L, AL, or sor) is found. If an

    // AL is found, change the type of the European number to Arabic

    // number.

    // W3. Change all ALs to R.

    for (var i$2 = 0, cur = outerType; i$2 < len; ++i$2) {

      var type$1 = types[i$2]

      if (type$1 == "1" && cur == "r") { types[i$2] = "n" }

      else if (isStrong.test(type$1)) { cur = type$1; if (type$1 == "r") { types[i$2] = "R" } }

    }



    // W4. A single European separator between two European numbers

    // changes to a European number. A single common separator between

    // two numbers of the same type changes to that type.

    for (var i$3 = 1, prev$1 = types[0]; i$3 < len - 1; ++i$3) {

      var type$2 = types[i$3]

      if (type$2 == "+" && prev$1 == "1" && types[i$3+1] == "1") { types[i$3] = "1" }

      else if (type$2 == "," && prev$1 == types[i$3+1] &&

               (prev$1 == "1" || prev$1 == "n")) { types[i$3] = prev$1 }

      prev$1 = type$2

    }



    // W5. A sequence of European terminators adjacent to European

    // numbers changes to all European numbers.

    // W6. Otherwise, separators and terminators change to Other

    // Neutral.

    for (var i$4 = 0; i$4 < len; ++i$4) {

      var type$3 = types[i$4]

      if (type$3 == ",") { types[i$4] = "N" }

      else if (type$3 == "%") {

        var end = (void 0)

        for (end = i$4 + 1; end < len && types[end] == "%"; ++end) {}

        var replace = (i$4 && types[i$4-1] == "!") || (end < len && types[end] == "1") ? "1" : "N"

        for (var j = i$4; j < end; ++j) { types[j] = replace }

        i$4 = end - 1

      }

    }



    // W7. Search backwards from each instance of a European number

    // until the first strong type (R, L, or sor) is found. If an L is

    // found, then change the type of the European number to L.

    for (var i$5 = 0, cur$1 = outerType; i$5 < len; ++i$5) {

      var type$4 = types[i$5]

      if (cur$1 == "L" && type$4 == "1") { types[i$5] = "L" }

      else if (isStrong.test(type$4)) { cur$1 = type$4 }

    }



    // N1. A sequence of neutrals takes the direction of the

    // surrounding strong text if the text on both sides has the same

    // direction. European and Arabic numbers act as if they were R in

    // terms of their influence on neutrals. Start-of-level-run (sor)

    // and end-of-level-run (eor) are used at level run boundaries.

    // N2. Any remaining neutrals take the embedding direction.

    for (var i$6 = 0; i$6 < len; ++i$6) {

      if (isNeutral.test(types[i$6])) {

        var end$1 = (void 0)

        for (end$1 = i$6 + 1; end$1 < len && isNeutral.test(types[end$1]); ++end$1) {}

        var before = (i$6 ? types[i$6-1] : outerType) == "L"

        var after = (end$1 < len ? types[end$1] : outerType) == "L"

        var replace$1 = before == after ? (before ? "L" : "R") : outerType

        for (var j$1 = i$6; j$1 < end$1; ++j$1) { types[j$1] = replace$1 }

        i$6 = end$1 - 1

      }

    }



    // Here we depart from the documented algorithm, in order to avoid

    // building up an actual levels array. Since there are only three

    // levels (0, 1, 2) in an implementation that doesn't take

    // explicit embedding into account, we can build up the order on

    // the fly, without following the level-based algorithm.

    var order = [], m

    for (var i$7 = 0; i$7 < len;) {

      if (countsAsLeft.test(types[i$7])) {

        var start = i$7

        for (++i$7; i$7 < len && countsAsLeft.test(types[i$7]); ++i$7) {}

        order.push(new BidiSpan(0, start, i$7))

      } else {

        var pos = i$7, at = order.length

        for (++i$7; i$7 < len && types[i$7] != "L"; ++i$7) {}

        for (var j$2 = pos; j$2 < i$7;) {

          if (countsAsNum.test(types[j$2])) {

            if (pos < j$2) { order.splice(at, 0, new BidiSpan(1, pos, j$2)) }

            var nstart = j$2

            for (++j$2; j$2 < i$7 && countsAsNum.test(types[j$2]); ++j$2) {}

            order.splice(at, 0, new BidiSpan(2, nstart, j$2))

            pos = j$2

          } else { ++j$2 }

        }

        if (pos < i$7) { order.splice(at, 0, new BidiSpan(1, pos, i$7)) }

      }

    }

    if (direction == "ltr") {

      if (order[0].level == 1 && (m = str.match(/^\s+/))) {

        order[0].from = m[0].length

        order.unshift(new BidiSpan(0, 0, m[0].length))

      }

      if (lst(order).level == 1 && (m = str.match(/\s+$/))) {

        lst(order).to -= m[0].length

        order.push(new BidiSpan(0, len - m[0].length, len))

      }

    }



    return direction == "rtl" ? order.reverse() : order

  }

})()



// Get the bidi ordering for the given line (and cache it). Returns

// false for lines that are fully left-to-right, and an array of

// BidiSpan objects otherwise.

function getOrder(line, direction) {

  var order = line.order

  if (order == null) { order = line.order = bidiOrdering(line.text, direction) }

  return order

}



// EVENT HANDLING



// Lightweight event framework. on/off also work on DOM nodes,

// registering native DOM handlers.



var noHandlers = []



var on = function(emitter, type, f) {

  if (emitter.addEventListener) {

    emitter.addEventListener(type, f, false)

  } else if (emitter.attachEvent) {

    emitter.attachEvent("on" + type, f)

  } else {

    var map = emitter._handlers || (emitter._handlers = {})

    map[type] = (map[type] || noHandlers).concat(f)

  }

}



function getHandlers(emitter, type) {

  return emitter._handlers && emitter._handlers[type] || noHandlers

}



function off(emitter, type, f) {

  if (emitter.removeEventListener) {

    emitter.removeEventListener(type, f, false)

  } else if (emitter.detachEvent) {

    emitter.detachEvent("on" + type, f)

  } else {

    var map = emitter._handlers, arr = map && map[type]

    if (arr) {

      var index = indexOf(arr, f)

      if (index > -1)

        { map[type] = arr.slice(0, index).concat(arr.slice(index + 1)) }

    }

  }

}



function signal(emitter, type /*, values...*/) {

  var handlers = getHandlers(emitter, type)

  if (!handlers.length) { return }

  var args = Array.prototype.slice.call(arguments, 2)

  for (var i = 0; i < handlers.length; ++i) { handlers[i].apply(null, args) }

}



// The DOM events that CodeMirror handles can be overridden by

// registering a (non-DOM) handler on the editor for the event name,

// and preventDefault-ing the event in that handler.

function signalDOMEvent(cm, e, override) {

  if (typeof e == "string")

    { e = {type: e, preventDefault: function() { this.defaultPrevented = true }} }

  signal(cm, override || e.type, cm, e)

  return e_defaultPrevented(e) || e.codemirrorIgnore

}



function signalCursorActivity(cm) {

  var arr = cm._handlers && cm._handlers.cursorActivity

  if (!arr) { return }

  var set = cm.curOp.cursorActivityHandlers || (cm.curOp.cursorActivityHandlers = [])

  for (var i = 0; i < arr.length; ++i) { if (indexOf(set, arr[i]) == -1)

    { set.push(arr[i]) } }

}



function hasHandler(emitter, type) {

  return getHandlers(emitter, type).length > 0

}



// Add on and off methods to a constructor's prototype, to make

// registering events on such objects more convenient.

function eventMixin(ctor) {

  ctor.prototype.on = function(type, f) {on(this, type, f)}

  ctor.prototype.off = function(type, f) {off(this, type, f)}

}



// Due to the fact that we still support jurassic IE versions, some

// compatibility wrappers are needed.



function e_preventDefault(e) {

  if (e.preventDefault) { e.preventDefault() }

  else { e.returnValue = false }

}

function e_stopPropagation(e) {

  if (e.stopPropagation) { e.stopPropagation() }

  else { e.cancelBubble = true }

}

function e_defaultPrevented(e) {

  return e.defaultPrevented != null ? e.defaultPrevented : e.returnValue == false

}

function e_stop(e) {e_preventDefault(e); e_stopPropagation(e)}



function e_target(e) {return e.target || e.srcElement}

function e_button(e) {

  var b = e.which

  if (b == null) {

    if (e.button & 1) { b = 1 }

    else if (e.button & 2) { b = 3 }

    else if (e.button & 4) { b = 2 }

  }

  if (mac && e.ctrlKey && b == 1) { b = 3 }

  return b

}



// Detect drag-and-drop

var dragAndDrop = function() {

  // There is *some* kind of drag-and-drop support in IE6-8, but I

  // couldn't get it to work yet.

  if (ie && ie_version < 9) { return false }

  var div = elt('div')

  return "draggable" in div || "dragDrop" in div

}()



var zwspSupported

function zeroWidthElement(measure) {

  if (zwspSupported == null) {

    var test = elt("span", "\u200b")

    removeChildrenAndAdd(measure, elt("span", [test, document.createTextNode("x")]))

    if (measure.firstChild.offsetHeight != 0)

      { zwspSupported = test.offsetWidth <= 1 && test.offsetHeight > 2 && !(ie && ie_version < 8) }

  }

  var node = zwspSupported ? elt("span", "\u200b") :

    elt("span", "\u00a0", null, "display: inline-block; width: 1px; margin-right: -1px")

  node.setAttribute("cm-text", "")

  return node

}



// Feature-detect IE's crummy client rect reporting for bidi text

var badBidiRects

function hasBadBidiRects(measure) {

  if (badBidiRects != null) { return badBidiRects }

  var txt = removeChildrenAndAdd(measure, document.createTextNode("A\u062eA"))

  var r0 = range(txt, 0, 1).getBoundingClientRect()

  var r1 = range(txt, 1, 2).getBoundingClientRect()

  removeChildren(measure)

  if (!r0 || r0.left == r0.right) { return false } // Safari returns null in some cases (#2780)

  return badBidiRects = (r1.right - r0.right < 3)

}



// See if "".split is the broken IE version, if so, provide an

// alternative way to split lines.

var splitLinesAuto = "\n\nb".split(/\n/).length != 3 ? function (string) {

  var pos = 0, result = [], l = string.length

  while (pos <= l) {

    var nl = string.indexOf("\n", pos)

    if (nl == -1) { nl = string.length }

    var line = string.slice(pos, string.charAt(nl - 1) == "\r" ? nl - 1 : nl)

    var rt = line.indexOf("\r")

    if (rt != -1) {

      result.push(line.slice(0, rt))

      pos += rt + 1

    } else {

      result.push(line)

      pos = nl + 1

    }

  }

  return result

} : function (string) { return string.split(/\r\n?|\n/); }



var hasSelection = window.getSelection ? function (te) {

  try { return te.selectionStart != te.selectionEnd }

  catch(e) { return false }

} : function (te) {

  var range

  try {range = te.ownerDocument.selection.createRange()}

  catch(e) {}

  if (!range || range.parentElement() != te) { return false }

  return range.compareEndPoints("StartToEnd", range) != 0

}



var hasCopyEvent = (function () {

  var e = elt("div")

  if ("oncopy" in e) { return true }

  e.setAttribute("oncopy", "return;")

  return typeof e.oncopy == "function"

})()



var badZoomedRects = null

function hasBadZoomedRects(measure) {

  if (badZoomedRects != null) { return badZoomedRects }

  var node = removeChildrenAndAdd(measure, elt("span", "x"))

  var normal = node.getBoundingClientRect()

  var fromRange = range(node, 0, 1).getBoundingClientRect()

  return badZoomedRects = Math.abs(normal.left - fromRange.left) > 1

}



var modes = {};

var mimeModes = {};

// Extra arguments are stored as the mode's dependencies, which is

// used by (legacy) mechanisms like loadmode.js to automatically

// load a mode. (Preferred mechanism is the require/define calls.)

function defineMode(name, mode) {

  if (arguments.length > 2)

    { mode.dependencies = Array.prototype.slice.call(arguments, 2) }

  modes[name] = mode

}



function defineMIME(mime, spec) {

  mimeModes[mime] = spec

}



// Given a MIME type, a {name, ...options} config object, or a name

// string, return a mode config object.

function resolveMode(spec) {

  if (typeof spec == "string" && mimeModes.hasOwnProperty(spec)) {

    spec = mimeModes[spec]

  } else if (spec && typeof spec.name == "string" && mimeModes.hasOwnProperty(spec.name)) {

    var found = mimeModes[spec.name]

    if (typeof found == "string") { found = {name: found} }

    spec = createObj(found, spec)

    spec.name = found.name

  } else if (typeof spec == "string" && /^[\w\-]+\/[\w\-]+\+xml$/.test(spec)) {

    return resolveMode("application/xml")

  } else if (typeof spec == "string" && /^[\w\-]+\/[\w\-]+\+json$/.test(spec)) {

    return resolveMode("application/json")

  }

  if (typeof spec == "string") { return {name: spec} }

  else { return spec || {name: "null"} }

}



// Given a mode spec (anything that resolveMode accepts), find and

// initialize an actual mode object.

function getMode(options, spec) {

  spec = resolveMode(spec)

  var mfactory = modes[spec.name]

  if (!mfactory) { return getMode(options, "text/plain") }

  var modeObj = mfactory(options, spec)

  if (modeExtensions.hasOwnProperty(spec.name)) {

    var exts = modeExtensions[spec.name]

    for (var prop in exts) {

      if (!exts.hasOwnProperty(prop)) { continue }

      if (modeObj.hasOwnProperty(prop)) { modeObj["_" + prop] = modeObj[prop] }

      modeObj[prop] = exts[prop]

    }

  }

  modeObj.name = spec.name

  if (spec.helperType) { modeObj.helperType = spec.helperType }

  if (spec.modeProps) { for (var prop$1 in spec.modeProps)

    { modeObj[prop$1] = spec.modeProps[prop$1] } }



  return modeObj

}



// This can be used to attach properties to mode objects from

// outside the actual mode definition.

var modeExtensions = {}

function extendMode(mode, properties) {

  var exts = modeExtensions.hasOwnProperty(mode) ? modeExtensions[mode] : (modeExtensions[mode] = {})

  copyObj(properties, exts)

}



function copyState(mode, state) {

  if (state === true) { return state }

  if (mode.copyState) { return mode.copyState(state) }

  var nstate = {}

  for (var n in state) {

    var val = state[n]

    if (val instanceof Array) { val = val.concat([]) }

    nstate[n] = val

  }

  return nstate

}



// Given a mode and a state (for that mode), find the inner mode and

// state at the position that the state refers to.

function innerMode(mode, state) {

  var info

  while (mode.innerMode) {

    info = mode.innerMode(state)

    if (!info || info.mode == mode) { break }

    state = info.state

    mode = info.mode

  }

  return info || {mode: mode, state: state}

}



function startState(mode, a1, a2) {

  return mode.startState ? mode.startState(a1, a2) : true

}



// STRING STREAM



// Fed to the mode parsers, provides helper functions to make

// parsers more succinct.



var StringStream = function(string, tabSize, lineOracle) {

  this.pos = this.start = 0

  this.string = string

  this.tabSize = tabSize || 8

  this.lastColumnPos = this.lastColumnValue = 0

  this.lineStart = 0

  this.lineOracle = lineOracle

};



StringStream.prototype.eol = function () {return this.pos >= this.string.length};

StringStream.prototype.sol = function () {return this.pos == this.lineStart};

StringStream.prototype.peek = function () {return this.string.charAt(this.pos) || undefined};

StringStream.prototype.next = function () {

  if (this.pos < this.string.length)

    { return this.string.charAt(this.pos++) }

};

StringStream.prototype.eat = function (match) {

  var ch = this.string.charAt(this.pos)

  var ok

  if (typeof match == "string") { ok = ch == match }

  else { ok = ch && (match.test ? match.test(ch) : match(ch)) }

  if (ok) {++this.pos; return ch}

};

StringStream.prototype.eatWhile = function (match) {

  var start = this.pos

  while (this.eat(match)){}

  return this.pos > start

};

StringStream.prototype.eatSpace = function () {

    var this$1 = this;



  var start = this.pos

  while (/[\s\u00a0]/.test(this.string.charAt(this.pos))) { ++this$1.pos }

  return this.pos > start

};

StringStream.prototype.skipToEnd = function () {this.pos = this.string.length};

StringStream.prototype.skipTo = function (ch) {

  var found = this.string.indexOf(ch, this.pos)

  if (found > -1) {this.pos = found; return true}

};

StringStream.prototype.backUp = function (n) {this.pos -= n};

StringStream.prototype.column = function () {

  if (this.lastColumnPos < this.start) {

    this.lastColumnValue = countColumn(this.string, this.start, this.tabSize, this.lastColumnPos, this.lastColumnValue)

    this.lastColumnPos = this.start

  }

  return this.lastColumnValue - (this.lineStart ? countColumn(this.string, this.lineStart, this.tabSize) : 0)

};

StringStream.prototype.indentation = function () {

  return countColumn(this.string, null, this.tabSize) -

    (this.lineStart ? countColumn(this.string, this.lineStart, this.tabSize) : 0)

};

StringStream.prototype.match = function (pattern, consume, caseInsensitive) {

  if (typeof pattern == "string") {

    var cased = function (str) { return caseInsensitive ? str.toLowerCase() : str; }

    var substr = this.string.substr(this.pos, pattern.length)

    if (cased(substr) == cased(pattern)) {

      if (consume !== false) { this.pos += pattern.length }

      return true

    }

  } else {

    var match = this.string.slice(this.pos).match(pattern)

    if (match && match.index > 0) { return null }

    if (match && consume !== false) { this.pos += match[0].length }

    return match

  }

};

StringStream.prototype.current = function (){return this.string.slice(this.start, this.pos)};

StringStream.prototype.hideFirstChars = function (n, inner) {

  this.lineStart += n

  try { return inner() }

  finally { this.lineStart -= n }

};

StringStream.prototype.lookAhead = function (n) {

  var oracle = this.lineOracle

  return oracle && oracle.lookAhead(n)

};

StringStream.prototype.baseToken = function () {

  var oracle = this.lineOracle

  return oracle && oracle.baseToken(this.pos)

};



var SavedContext = function(state, lookAhead) {

  this.state = state

  this.lookAhead = lookAhead

};



var Context = function(doc, state, line, lookAhead) {

  this.state = state

  this.doc = doc

  this.line = line

  this.maxLookAhead = lookAhead || 0

  this.baseTokens = null

  this.baseTokenPos = 1

};



Context.prototype.lookAhead = function (n) {

  var line = this.doc.getLine(this.line + n)

  if (line != null && n > this.maxLookAhead) { this.maxLookAhead = n }

  return line

};



Context.prototype.baseToken = function (n) {

    var this$1 = this;



  if (!this.baseTokens) { return null }

  while (this.baseTokens[this.baseTokenPos] <= n)

    { this$1.baseTokenPos += 2 }

  var type = this.baseTokens[this.baseTokenPos + 1]

  return {type: type && type.replace(/( |^)overlay .*/, ""),

          size: this.baseTokens[this.baseTokenPos] - n}

};



Context.prototype.nextLine = function () {

  this.line++

  if (this.maxLookAhead > 0) { this.maxLookAhead-- }

};



Context.fromSaved = function (doc, saved, line) {

  if (saved instanceof SavedContext)

    { return new Context(doc, copyState(doc.mode, saved.state), line, saved.lookAhead) }

  else

    { return new Context(doc, copyState(doc.mode, saved), line) }

};



Context.prototype.save = function (copy) {

  var state = copy !== false ? copyState(this.doc.mode, this.state) : this.state

  return this.maxLookAhead > 0 ? new SavedContext(state, this.maxLookAhead) : state

};





// Compute a style array (an array starting with a mode generation

// -- for invalidation -- followed by pairs of end positions and

// style strings), which is used to highlight the tokens on the

// line.

function highlightLine(cm, line, context, forceToEnd) {

  // A styles array always starts with a number identifying the

  // mode/overlays that it is based on (for easy invalidation).

  var st = [cm.state.modeGen], lineClasses = {}

  // Compute the base array of styles

  runMode(cm, line.text, cm.doc.mode, context, function (end, style) { return st.push(end, style); },

          lineClasses, forceToEnd)

  var state = context.state



  // Run overlays, adjust style array.

  var loop = function ( o ) {

    context.baseTokens = st

    var overlay = cm.state.overlays[o], i = 1, at = 0

    context.state = true

    runMode(cm, line.text, overlay.mode, context, function (end, style) {

      var start = i

      // Ensure there's a token end at the current position, and that i points at it

      while (at < end) {

        var i_end = st[i]

        if (i_end > end)

          { st.splice(i, 1, end, st[i+1], i_end) }

        i += 2

        at = Math.min(end, i_end)

      }

      if (!style) { return }

      if (overlay.opaque) {

        st.splice(start, i - start, end, "overlay " + style)

        i = start + 2

      } else {

        for (; start < i; start += 2) {

          var cur = st[start+1]

          st[start+1] = (cur ? cur + " " : "") + "overlay " + style

        }

      }

    }, lineClasses)

    context.state = state

    context.baseTokens = null

    context.baseTokenPos = 1

  };



  for (var o = 0; o < cm.state.overlays.length; ++o) loop( o );



  return {styles: st, classes: lineClasses.bgClass || lineClasses.textClass ? lineClasses : null}

}



function getLineStyles(cm, line, updateFrontier) {

  if (!line.styles || line.styles[0] != cm.state.modeGen) {

    var context = getContextBefore(cm, lineNo(line))

    var resetState = line.text.length > cm.options.maxHighlightLength && copyState(cm.doc.mode, context.state)

    var result = highlightLine(cm, line, context)

    if (resetState) { context.state = resetState }

    line.stateAfter = context.save(!resetState)

    line.styles = result.styles

    if (result.classes) { line.styleClasses = result.classes }

    else if (line.styleClasses) { line.styleClasses = null }

    if (updateFrontier === cm.doc.highlightFrontier)

      { cm.doc.modeFrontier = Math.max(cm.doc.modeFrontier, ++cm.doc.highlightFrontier) }

  }

  return line.styles

}



function getContextBefore(cm, n, precise) {

  var doc = cm.doc, display = cm.display

  if (!doc.mode.startState) { return new Context(doc, true, n) }

  var start = findStartLine(cm, n, precise)

  var saved = start > doc.first && getLine(doc, start - 1).stateAfter

  var context = saved ? Context.fromSaved(doc, saved, start) : new Context(doc, startState(doc.mode), start)



  doc.iter(start, n, function (line) {

    processLine(cm, line.text, context)

    var pos = context.line

    line.stateAfter = pos == n - 1 || pos % 5 == 0 || pos >= display.viewFrom && pos < display.viewTo ? context.save() : null

    context.nextLine()

  })

  if (precise) { doc.modeFrontier = context.line }

  return context

}



// Lightweight form of highlight -- proceed over this line and

// update state, but don't save a style array. Used for lines that

// aren't currently visible.

function processLine(cm, text, context, startAt) {

  var mode = cm.doc.mode

  var stream = new StringStream(text, cm.options.tabSize, context)

  stream.start = stream.pos = startAt || 0

  if (text == "") { callBlankLine(mode, context.state) }

  while (!stream.eol()) {

    readToken(mode, stream, context.state)

    stream.start = stream.pos

  }

}



function callBlankLine(mode, state) {

  if (mode.blankLine) { return mode.blankLine(state) }

  if (!mode.innerMode) { return }

  var inner = innerMode(mode, state)

  if (inner.mode.blankLine) { return inner.mode.blankLine(inner.state) }

}



function readToken(mode, stream, state, inner) {

  for (var i = 0; i < 10; i++) {

    if (inner) { inner[0] = innerMode(mode, state).mode }

    var style = mode.token(stream, state)

    if (stream.pos > stream.start) { return style }

  }

  throw new Error("Mode " + mode.name + " failed to advance stream.")

}



var Token = function(stream, type, state) {

  this.start = stream.start; this.end = stream.pos

  this.string = stream.current()

  this.type = type || null

  this.state = state

};



// Utility for getTokenAt and getLineTokens

function takeToken(cm, pos, precise, asArray) {

  var doc = cm.doc, mode = doc.mode, style

  pos = clipPos(doc, pos)

  var line = getLine(doc, pos.line), context = getContextBefore(cm, pos.line, precise)

  var stream = new StringStream(line.text, cm.options.tabSize, context), tokens

  if (asArray) { tokens = [] }

  while ((asArray || stream.pos < pos.ch) && !stream.eol()) {

    stream.start = stream.pos

    style = readToken(mode, stream, context.state)

    if (asArray) { tokens.push(new Token(stream, style, copyState(doc.mode, context.state))) }

  }

  return asArray ? tokens : new Token(stream, style, context.state)

}



function extractLineClasses(type, output) {

  if (type) { for (;;) {

    var lineClass = type.match(/(?:^|\s+)line-(background-)?(\S+)/)

    if (!lineClass) { break }

    type = type.slice(0, lineClass.index) + type.slice(lineClass.index + lineClass[0].length)

    var prop = lineClass[1] ? "bgClass" : "textClass"

    if (output[prop] == null)

      { output[prop] = lineClass[2] }

    else if (!(new RegExp("(?:^|\s)" + lineClass[2] + "(?:$|\s)")).test(output[prop]))

      { output[prop] += " " + lineClass[2] }

  } }

  return type

}



// Run the given mode's parser over a line, calling f for each token.

function runMode(cm, text, mode, context, f, lineClasses, forceToEnd) {

  var flattenSpans = mode.flattenSpans

  if (flattenSpans == null) { flattenSpans = cm.options.flattenSpans }

  var curStart = 0, curStyle = null

  var stream = new StringStream(text, cm.options.tabSize, context), style

  var inner = cm.options.addModeClass && [null]

  if (text == "") { extractLineClasses(callBlankLine(mode, context.state), lineClasses) }

  while (!stream.eol()) {

    if (stream.pos > cm.options.maxHighlightLength) {

      flattenSpans = false

      if (forceToEnd) { processLine(cm, text, context, stream.pos) }

      stream.pos = text.length

      style = null

    } else {

      style = extractLineClasses(readToken(mode, stream, context.state, inner), lineClasses)

    }

    if (inner) {

      var mName = inner[0].name

      if (mName) { style = "m-" + (style ? mName + " " + style : mName) }

    }

    if (!flattenSpans || curStyle != style) {

      while (curStart < stream.start) {

        curStart = Math.min(stream.start, curStart + 5000)

        f(curStart, curStyle)

      }

      curStyle = style

    }

    stream.start = stream.pos

  }

  while (curStart < stream.pos) {

    // Webkit seems to refuse to render text nodes longer than 57444

    // characters, and returns inaccurate measurements in nodes

    // starting around 5000 chars.

    var pos = Math.min(stream.pos, curStart + 5000)

    f(pos, curStyle)

    curStart = pos

  }

}



// Finds the line to start with when starting a parse. Tries to

// find a line with a stateAfter, so that it can start with a

// valid state. If that fails, it returns the line with the

// smallest indentation, which tends to need the least context to

// parse correctly.

function findStartLine(cm, n, precise) {

  var minindent, minline, doc = cm.doc

  var lim = precise ? -1 : n - (cm.doc.mode.innerMode ? 1000 : 100)

  for (var search = n; search > lim; --search) {

    if (search <= doc.first) { return doc.first }

    var line = getLine(doc, search - 1), after = line.stateAfter

    if (after && (!precise || search + (after instanceof SavedContext ? after.lookAhead : 0) <= doc.modeFrontier))

      { return search }

    var indented = countColumn(line.text, null, cm.options.tabSize)

    if (minline == null || minindent > indented) {

      minline = search - 1

      minindent = indented

    }

  }

  return minline

}



function retreatFrontier(doc, n) {

  doc.modeFrontier = Math.min(doc.modeFrontier, n)

  if (doc.highlightFrontier < n - 10) { return }

  var start = doc.first

  for (var line = n - 1; line > start; line--) {

    var saved = getLine(doc, line).stateAfter

    // change is on 3

    // state on line 1 looked ahead 2 -- so saw 3

    // test 1 + 2 < 3 should cover this

    if (saved && (!(saved instanceof SavedContext) || line + saved.lookAhead < n)) {

      start = line + 1

      break

    }

  }

  doc.highlightFrontier = Math.min(doc.highlightFrontier, start)

}



// LINE DATA STRUCTURE



// Line objects. These hold state related to a line, including

// highlighting info (the styles array).

var Line = function(text, markedSpans, estimateHeight) {

  this.text = text

  attachMarkedSpans(this, markedSpans)

  this.height = estimateHeight ? estimateHeight(this) : 1

};



Line.prototype.lineNo = function () { return lineNo(this) };

eventMixin(Line)



// Change the content (text, markers) of a line. Automatically

// invalidates cached information and tries to re-estimate the

// line's height.

function updateLine(line, text, markedSpans, estimateHeight) {

  line.text = text

  if (line.stateAfter) { line.stateAfter = null }

  if (line.styles) { line.styles = null }

  if (line.order != null) { line.order = null }

  detachMarkedSpans(line)

  attachMarkedSpans(line, markedSpans)

  var estHeight = estimateHeight ? estimateHeight(line) : 1

  if (estHeight != line.height) { updateLineHeight(line, estHeight) }

}



// Detach a line from the document tree and its markers.

function cleanUpLine(line) {

  line.parent = null

  detachMarkedSpans(line)

}



// Convert a style as returned by a mode (either null, or a string

// containing one or more styles) to a CSS style. This is cached,

// and also looks for line-wide styles.

var styleToClassCache = {};

var styleToClassCacheWithMode = {};

function interpretTokenStyle(style, options) {

  if (!style || /^\s*$/.test(style)) { return null }

  var cache = options.addModeClass ? styleToClassCacheWithMode : styleToClassCache

  return cache[style] ||

    (cache[style] = style.replace(/\S+/g, "cm-$&"))

}



// Render the DOM representation of the text of a line. Also builds

// up a 'line map', which points at the DOM nodes that represent

// specific stretches of text, and is used by the measuring code.

// The returned object contains the DOM node, this map, and

// information about line-wide styles that were set by the mode.

function buildLineContent(cm, lineView) {

  // The padding-right forces the element to have a 'border', which

  // is needed on Webkit to be able to get line-level bounding

  // rectangles for it (in measureChar).

  var content = eltP("span", null, null, webkit ? "padding-right: .1px" : null)

  var builder = {pre: eltP("pre", [content], "CodeMirror-line"), content: content,

                 col: 0, pos: 0, cm: cm,

                 trailingSpace: false,

                 splitSpaces: (ie || webkit) && cm.getOption("lineWrapping")}

  lineView.measure = {}



  // Iterate over the logical lines that make up this visual line.

  for (var i = 0; i <= (lineView.rest ? lineView.rest.length : 0); i++) {

    var line = i ? lineView.rest[i - 1] : lineView.line, order = (void 0)

    builder.pos = 0

    builder.addToken = buildToken

    // Optionally wire in some hacks into the token-rendering

    // algorithm, to deal with browser quirks.

    if (hasBadBidiRects(cm.display.measure) && (order = getOrder(line, cm.doc.direction)))

      { builder.addToken = buildTokenBadBidi(builder.addToken, order) }

    builder.map = []

    var allowFrontierUpdate = lineView != cm.display.externalMeasured && lineNo(line)

    insertLineContent(line, builder, getLineStyles(cm, line, allowFrontierUpdate))

    if (line.styleClasses) {

      if (line.styleClasses.bgClass)

        { builder.bgClass = joinClasses(line.styleClasses.bgClass, builder.bgClass || "") }

      if (line.styleClasses.textClass)

        { builder.textClass = joinClasses(line.styleClasses.textClass, builder.textClass || "") }

    }



    // Ensure at least a single node is present, for measuring.

    if (builder.map.length == 0)

      { builder.map.push(0, 0, builder.content.appendChild(zeroWidthElement(cm.display.measure))) }



    // Store the map and a cache object for the current logical line

    if (i == 0) {

      lineView.measure.map = builder.map

      lineView.measure.cache = {}

    } else {

      ;(lineView.measure.maps || (lineView.measure.maps = [])).push(builder.map)

      ;(lineView.measure.caches || (lineView.measure.caches = [])).push({})

    }

  }



  // See issue #2901

  if (webkit) {

    var last = builder.content.lastChild

    if (/\bcm-tab\b/.test(last.className) || (last.querySelector && last.querySelector(".cm-tab")))

      { builder.content.className = "cm-tab-wrap-hack" }

  }



  signal(cm, "renderLine", cm, lineView.line, builder.pre)

  if (builder.pre.className)

    { builder.textClass = joinClasses(builder.pre.className, builder.textClass || "") }



  return builder

}



function defaultSpecialCharPlaceholder(ch) {

  var token = elt("span", "\u2022", "cm-invalidchar")

  token.title = "\\u" + ch.charCodeAt(0).toString(16)

  token.setAttribute("aria-label", token.title)

  return token

}



// Build up the DOM representation for a single token, and add it to

// the line map. Takes care to render special characters separately.

function buildToken(builder, text, style, startStyle, endStyle, title, css) {

  if (!text) { return }

  var displayText = builder.splitSpaces ? splitSpaces(text, builder.trailingSpace) : text

  var special = builder.cm.state.specialChars, mustWrap = false

  var content

  if (!special.test(text)) {

    builder.col += text.length

    content = document.createTextNode(displayText)

    builder.map.push(builder.pos, builder.pos + text.length, content)

    if (ie && ie_version < 9) { mustWrap = true }

    builder.pos += text.length

  } else {

    content = document.createDocumentFragment()

    var pos = 0

    while (true) {

      special.lastIndex = pos

      var m = special.exec(text)

      var skipped = m ? m.index - pos : text.length - pos

      if (skipped) {

        var txt = document.createTextNode(displayText.slice(pos, pos + skipped))

        if (ie && ie_version < 9) { content.appendChild(elt("span", [txt])) }

        else { content.appendChild(txt) }

        builder.map.push(builder.pos, builder.pos + skipped, txt)

        builder.col += skipped

        builder.pos += skipped

      }

      if (!m) { break }

      pos += skipped + 1

      var txt$1 = (void 0)

      if (m[0] == "\t") {

        var tabSize = builder.cm.options.tabSize, tabWidth = tabSize - builder.col % tabSize

        txt$1 = content.appendChild(elt("span", spaceStr(tabWidth), "cm-tab"))

        txt$1.setAttribute("role", "presentation")

        txt$1.setAttribute("cm-text", "\t")

        builder.col += tabWidth

      } else if (m[0] == "\r" || m[0] == "\n") {

        txt$1 = content.appendChild(elt("span", m[0] == "\r" ? "\u240d" : "\u2424", "cm-invalidchar"))

        txt$1.setAttribute("cm-text", m[0])

        builder.col += 1

      } else {

        txt$1 = builder.cm.options.specialCharPlaceholder(m[0])

        txt$1.setAttribute("cm-text", m[0])

        if (ie && ie_version < 9) { content.appendChild(elt("span", [txt$1])) }

        else { content.appendChild(txt$1) }

        builder.col += 1

      }

      builder.map.push(builder.pos, builder.pos + 1, txt$1)

      builder.pos++

    }

  }

  builder.trailingSpace = displayText.charCodeAt(text.length - 1) == 32

  if (style || startStyle || endStyle || mustWrap || css) {

    var fullStyle = style || ""

    if (startStyle) { fullStyle += startStyle }

    if (endStyle) { fullStyle += endStyle }

    var token = elt("span", [content], fullStyle, css)

    if (title) { token.title = title }

    return builder.content.appendChild(token)

  }

  builder.content.appendChild(content)

}



function splitSpaces(text, trailingBefore) {

  if (text.length > 1 && !/  /.test(text)) { return text }

  var spaceBefore = trailingBefore, result = ""

  for (var i = 0; i < text.length; i++) {

    var ch = text.charAt(i)

    if (ch == " " && spaceBefore && (i == text.length - 1 || text.charCodeAt(i + 1) == 32))

      { ch = "\u00a0" }

    result += ch

    spaceBefore = ch == " "

  }

  return result

}



// Work around nonsense dimensions being reported for stretches of

// right-to-left text.

function buildTokenBadBidi(inner, order) {

  return function (builder, text, style, startStyle, endStyle, title, css) {

    style = style ? style + " cm-force-border" : "cm-force-border"

    var start = builder.pos, end = start + text.length

    for (;;) {

      // Find the part that overlaps with the start of this text

      var part = (void 0)

      for (var i = 0; i < order.length; i++) {

        part = order[i]

        if (part.to > start && part.from <= start) { break }

      }

      if (part.to >= end) { return inner(builder, text, style, startStyle, endStyle, title, css) }

      inner(builder, text.slice(0, part.to - start), style, startStyle, null, title, css)

      startStyle = null

      text = text.slice(part.to - start)

      start = part.to

    }

  }

}



function buildCollapsedSpan(builder, size, marker, ignoreWidget) {

  var widget = !ignoreWidget && marker.widgetNode

  if (widget) { builder.map.push(builder.pos, builder.pos + size, widget) }

  if (!ignoreWidget && builder.cm.display.input.needsContentAttribute) {

    if (!widget)

      { widget = builder.content.appendChild(document.createElement("span")) }

    widget.setAttribute("cm-marker", marker.id)

  }

  if (widget) {

    builder.cm.display.input.setUneditable(widget)

    builder.content.appendChild(widget)

  }

  builder.pos += size

  builder.trailingSpace = false

}



// Outputs a number of spans to make up a line, taking highlighting

// and marked text into account.

function insertLineContent(line, builder, styles) {

  var spans = line.markedSpans, allText = line.text, at = 0

  if (!spans) {

    for (var i$1 = 1; i$1 < styles.length; i$1+=2)

      { builder.addToken(builder, allText.slice(at, at = styles[i$1]), interpretTokenStyle(styles[i$1+1], builder.cm.options)) }

    return

  }



  var len = allText.length, pos = 0, i = 1, text = "", style, css

  var nextChange = 0, spanStyle, spanEndStyle, spanStartStyle, title, collapsed

  for (;;) {

    if (nextChange == pos) { // Update current marker set

      spanStyle = spanEndStyle = spanStartStyle = title = css = ""

      collapsed = null; nextChange = Infinity

      var foundBookmarks = [], endStyles = (void 0)

      for (var j = 0; j < spans.length; ++j) {

        var sp = spans[j], m = sp.marker

        if (m.type == "bookmark" && sp.from == pos && m.widgetNode) {

          foundBookmarks.push(m)

        } else if (sp.from <= pos && (sp.to == null || sp.to > pos || m.collapsed && sp.to == pos && sp.from == pos)) {

          if (sp.to != null && sp.to != pos && nextChange > sp.to) {

            nextChange = sp.to

            spanEndStyle = ""

          }

          if (m.className) { spanStyle += " " + m.className }

          if (m.css) { css = (css ? css + ";" : "") + m.css }

          if (m.startStyle && sp.from == pos) { spanStartStyle += " " + m.startStyle }

          if (m.endStyle && sp.to == nextChange) { (endStyles || (endStyles = [])).push(m.endStyle, sp.to) }

          if (m.title && !title) { title = m.title }

          if (m.collapsed && (!collapsed || compareCollapsedMarkers(collapsed.marker, m) < 0))

            { collapsed = sp }

        } else if (sp.from > pos && nextChange > sp.from) {

          nextChange = sp.from

        }

      }

      if (endStyles) { for (var j$1 = 0; j$1 < endStyles.length; j$1 += 2)

        { if (endStyles[j$1 + 1] == nextChange) { spanEndStyle += " " + endStyles[j$1] } } }



      if (!collapsed || collapsed.from == pos) { for (var j$2 = 0; j$2 < foundBookmarks.length; ++j$2)

        { buildCollapsedSpan(builder, 0, foundBookmarks[j$2]) } }

      if (collapsed && (collapsed.from || 0) == pos) {

        buildCollapsedSpan(builder, (collapsed.to == null ? len + 1 : collapsed.to) - pos,

                           collapsed.marker, collapsed.from == null)

        if (collapsed.to == null) { return }

        if (collapsed.to == pos) { collapsed = false }

      }

    }

    if (pos >= len) { break }



    var upto = Math.min(len, nextChange)

    while (true) {

      if (text) {

        var end = pos + text.length

        if (!collapsed) {

          var tokenText = end > upto ? text.slice(0, upto - pos) : text

          builder.addToken(builder, tokenText, style ? style + spanStyle : spanStyle,

                           spanStartStyle, pos + tokenText.length == nextChange ? spanEndStyle : "", title, css)

        }

        if (end >= upto) {text = text.slice(upto - pos); pos = upto; break}

        pos = end

        spanStartStyle = ""

      }

      text = allText.slice(at, at = styles[i++])

      style = interpretTokenStyle(styles[i++], builder.cm.options)

    }

  }

}





// These objects are used to represent the visible (currently drawn)

// part of the document. A LineView may correspond to multiple

// logical lines, if those are connected by collapsed ranges.

function LineView(doc, line, lineN) {

  // The starting line

  this.line = line

  // Continuing lines, if any

  this.rest = visualLineContinued(line)

  // Number of logical lines in this visual line

  this.size = this.rest ? lineNo(lst(this.rest)) - lineN + 1 : 1

  this.node = this.text = null

  this.hidden = lineIsHidden(doc, line)

}



// Create a range of LineView objects for the given lines.

function buildViewArray(cm, from, to) {

  var array = [], nextPos

  for (var pos = from; pos < to; pos = nextPos) {

    var view = new LineView(cm.doc, getLine(cm.doc, pos), pos)

    nextPos = pos + view.size

    array.push(view)

  }

  return array

}



var operationGroup = null



function pushOperation(op) {

  if (operationGroup) {

    operationGroup.ops.push(op)

  } else {

    op.ownsGroup = operationGroup = {

      ops: [op],

      delayedCallbacks: []

    }

  }

}



function fireCallbacksForOps(group) {

  // Calls delayed callbacks and cursorActivity handlers until no

  // new ones appear

  var callbacks = group.delayedCallbacks, i = 0

  do {

    for (; i < callbacks.length; i++)

      { callbacks[i].call(null) }

    for (var j = 0; j < group.ops.length; j++) {

      var op = group.ops[j]

      if (op.cursorActivityHandlers)

        { while (op.cursorActivityCalled < op.cursorActivityHandlers.length)

          { op.cursorActivityHandlers[op.cursorActivityCalled++].call(null, op.cm) } }

    }

  } while (i < callbacks.length)

}



function finishOperation(op, endCb) {

  var group = op.ownsGroup

  if (!group) { return }



  try { fireCallbacksForOps(group) }

  finally {

    operationGroup = null

    endCb(group)

  }

}



var orphanDelayedCallbacks = null



// Often, we want to signal events at a point where we are in the

// middle of some work, but don't want the handler to start calling

// other methods on the editor, which might be in an inconsistent

// state or simply not expect any other events to happen.

// signalLater looks whether there are any handlers, and schedules

// them to be executed when the last operation ends, or, if no

// operation is active, when a timeout fires.

function signalLater(emitter, type /*, values...*/) {

  var arr = getHandlers(emitter, type)

  if (!arr.length) { return }

  var args = Array.prototype.slice.call(arguments, 2), list

  if (operationGroup) {

    list = operationGroup.delayedCallbacks

  } else if (orphanDelayedCallbacks) {

    list = orphanDelayedCallbacks

  } else {

    list = orphanDelayedCallbacks = []

    setTimeout(fireOrphanDelayed, 0)

  }

  var loop = function ( i ) {

    list.push(function () { return arr[i].apply(null, args); })

  };



  for (var i = 0; i < arr.length; ++i)

    loop( i );

}



function fireOrphanDelayed() {

  var delayed = orphanDelayedCallbacks

  orphanDelayedCallbacks = null

  for (var i = 0; i < delayed.length; ++i) { delayed[i]() }

}



// When an aspect of a line changes, a string is added to

// lineView.changes. This updates the relevant part of the line's

// DOM structure.

function updateLineForChanges(cm, lineView, lineN, dims) {

  for (var j = 0; j < lineView.changes.length; j++) {

    var type = lineView.changes[j]

    if (type == "text") { updateLineText(cm, lineView) }

    else if (type == "gutter") { updateLineGutter(cm, lineView, lineN, dims) }

    else if (type == "class") { updateLineClasses(cm, lineView) }

    else if (type == "widget") { updateLineWidgets(cm, lineView, dims) }

  }

  lineView.changes = null

}



// Lines with gutter elements, widgets or a background class need to

// be wrapped, and have the extra elements added to the wrapper div

function ensureLineWrapped(lineView) {

  if (lineView.node == lineView.text) {

    lineView.node = elt("div", null, null, "position: relative")

    if (lineView.text.parentNode)

      { lineView.text.parentNode.replaceChild(lineView.node, lineView.text) }

    lineView.node.appendChild(lineView.text)

    if (ie && ie_version < 8) { lineView.node.style.zIndex = 2 }

  }

  return lineView.node

}



function updateLineBackground(cm, lineView) {

  var cls = lineView.bgClass ? lineView.bgClass + " " + (lineView.line.bgClass || "") : lineView.line.bgClass

  if (cls) { cls += " CodeMirror-linebackground" }

  if (lineView.background) {

    if (cls) { lineView.background.className = cls }

    else { lineView.background.parentNode.removeChild(lineView.background); lineView.background = null }

  } else if (cls) {

    var wrap = ensureLineWrapped(lineView)

    lineView.background = wrap.insertBefore(elt("div", null, cls), wrap.firstChild)

    cm.display.input.setUneditable(lineView.background)

  }

}



// Wrapper around buildLineContent which will reuse the structure

// in display.externalMeasured when possible.

function getLineContent(cm, lineView) {

  var ext = cm.display.externalMeasured

  if (ext && ext.line == lineView.line) {

    cm.display.externalMeasured = null

    lineView.measure = ext.measure

    return ext.built

  }

  return buildLineContent(cm, lineView)

}



// Redraw the line's text. Interacts with the background and text

// classes because the mode may output tokens that influence these

// classes.

function updateLineText(cm, lineView) {

  var cls = lineView.text.className

  var built = getLineContent(cm, lineView)

  if (lineView.text == lineView.node) { lineView.node = built.pre }

  lineView.text.parentNode.replaceChild(built.pre, lineView.text)

  lineView.text = built.pre

  if (built.bgClass != lineView.bgClass || built.textClass != lineView.textClass) {

    lineView.bgClass = built.bgClass

    lineView.textClass = built.textClass

    updateLineClasses(cm, lineView)

  } else if (cls) {

    lineView.text.className = cls

  }

}



function updateLineClasses(cm, lineView) {

  updateLineBackground(cm, lineView)

  if (lineView.line.wrapClass)

    { ensureLineWrapped(lineView).className = lineView.line.wrapClass }

  else if (lineView.node != lineView.text)

    { lineView.node.className = "" }

  var textClass = lineView.textClass ? lineView.textClass + " " + (lineView.line.textClass || "") : lineView.line.textClass

  lineView.text.className = textClass || ""

}



function updateLineGutter(cm, lineView, lineN, dims) {

  if (lineView.gutter) {

    lineView.node.removeChild(lineView.gutter)

    lineView.gutter = null

  }

  if (lineView.gutterBackground) {

    lineView.node.removeChild(lineView.gutterBackground)

    lineView.gutterBackground = null

  }

  if (lineView.line.gutterClass) {

    var wrap = ensureLineWrapped(lineView)

    lineView.gutterBackground = elt("div", null, "CodeMirror-gutter-background " + lineView.line.gutterClass,

                                    ("left: " + (cm.options.fixedGutter ? dims.fixedPos : -dims.gutterTotalWidth) + "px; width: " + (dims.gutterTotalWidth) + "px"))

    cm.display.input.setUneditable(lineView.gutterBackground)

    wrap.insertBefore(lineView.gutterBackground, lineView.text)

  }

  var markers = lineView.line.gutterMarkers

  if (cm.options.lineNumbers || markers) {

    var wrap$1 = ensureLineWrapped(lineView)

    var gutterWrap = lineView.gutter = elt("div", null, "CodeMirror-gutter-wrapper", ("left: " + (cm.options.fixedGutter ? dims.fixedPos : -dims.gutterTotalWidth) + "px"))

    cm.display.input.setUneditable(gutterWrap)

    wrap$1.insertBefore(gutterWrap, lineView.text)

    if (lineView.line.gutterClass)

      { gutterWrap.className += " " + lineView.line.gutterClass }

    if (cm.options.lineNumbers && (!markers || !markers["CodeMirror-linenumbers"]))

      { lineView.lineNumber = gutterWrap.appendChild(

        elt("div", lineNumberFor(cm.options, lineN),

            "CodeMirror-linenumber CodeMirror-gutter-elt",

            ("left: " + (dims.gutterLeft["CodeMirror-linenumbers"]) + "px; width: " + (cm.display.lineNumInnerWidth) + "px"))) }

    if (markers) { for (var k = 0; k < cm.options.gutters.length; ++k) {

      var id = cm.options.gutters[k], found = markers.hasOwnProperty(id) && markers[id]

      if (found)

        { gutterWrap.appendChild(elt("div", [found], "CodeMirror-gutter-elt",

                                   ("left: " + (dims.gutterLeft[id]) + "px; width: " + (dims.gutterWidth[id]) + "px"))) }

    } }

  }

}



function updateLineWidgets(cm, lineView, dims) {

  if (lineView.alignable) { lineView.alignable = null }

  for (var node = lineView.node.firstChild, next = (void 0); node; node = next) {

    next = node.nextSibling

    if (node.className == "CodeMirror-linewidget")

      { lineView.node.removeChild(node) }

  }

  insertLineWidgets(cm, lineView, dims)

}



// Build a line's DOM representation from scratch

function buildLineElement(cm, lineView, lineN, dims) {

  var built = getLineContent(cm, lineView)

  lineView.text = lineView.node = built.pre

  if (built.bgClass) { lineView.bgClass = built.bgClass }

  if (built.textClass) { lineView.textClass = built.textClass }



  updateLineClasses(cm, lineView)

  updateLineGutter(cm, lineView, lineN, dims)

  insertLineWidgets(cm, lineView, dims)

  return lineView.node

}



// A lineView may contain multiple logical lines (when merged by

// collapsed spans). The widgets for all of them need to be drawn.

function insertLineWidgets(cm, lineView, dims) {

  insertLineWidgetsFor(cm, lineView.line, lineView, dims, true)

  if (lineView.rest) { for (var i = 0; i < lineView.rest.length; i++)

    { insertLineWidgetsFor(cm, lineView.rest[i], lineView, dims, false) } }

}



function insertLineWidgetsFor(cm, line, lineView, dims, allowAbove) {

  if (!line.widgets) { return }

  var wrap = ensureLineWrapped(lineView)

  for (var i = 0, ws = line.widgets; i < ws.length; ++i) {

    var widget = ws[i], node = elt("div", [widget.node], "CodeMirror-linewidget")

    if (!widget.handleMouseEvents) { node.setAttribute("cm-ignore-events", "true") }

    positionLineWidget(widget, node, lineView, dims)

    cm.display.input.setUneditable(node)

    if (allowAbove && widget.above)

      { wrap.insertBefore(node, lineView.gutter || lineView.text) }

    else

      { wrap.appendChild(node) }

    signalLater(widget, "redraw")

  }

}



function positionLineWidget(widget, node, lineView, dims) {

  if (widget.noHScroll) {

    ;(lineView.alignable || (lineView.alignable = [])).push(node)

    var width = dims.wrapperWidth

    node.style.left = dims.fixedPos + "px"

    if (!widget.coverGutter) {

      width -= dims.gutterTotalWidth

      node.style.paddingLeft = dims.gutterTotalWidth + "px"

    }

    node.style.width = width + "px"

  }

  if (widget.coverGutter) {

    node.style.zIndex = 5

    node.style.position = "relative"

    if (!widget.noHScroll) { node.style.marginLeft = -dims.gutterTotalWidth + "px" }

  }

}



function widgetHeight(widget) {

  if (widget.height != null) { return widget.height }

  var cm = widget.doc.cm

  if (!cm) { return 0 }

  if (!contains(document.body, widget.node)) {

    var parentStyle = "position: relative;"

    if (widget.coverGutter)

      { parentStyle += "margin-left: -" + cm.display.gutters.offsetWidth + "px;" }

    if (widget.noHScroll)

      { parentStyle += "width: " + cm.display.wrapper.clientWidth + "px;" }

    removeChildrenAndAdd(cm.display.measure, elt("div", [widget.node], null, parentStyle))

  }

  return widget.height = widget.node.parentNode.offsetHeight

}



// Return true when the given mouse event happened in a widget

function eventInWidget(display, e) {

  for (var n = e_target(e); n != display.wrapper; n = n.parentNode) {

    if (!n || (n.nodeType == 1 && n.getAttribute("cm-ignore-events") == "true") ||

        (n.parentNode == display.sizer && n != display.mover))

      { return true }

  }

}



// POSITION MEASUREMENT



function paddingTop(display) {return display.lineSpace.offsetTop}

function paddingVert(display) {return display.mover.offsetHeight - display.lineSpace.offsetHeight}

function paddingH(display) {

  if (display.cachedPaddingH) { return display.cachedPaddingH }

  var e = removeChildrenAndAdd(display.measure, elt("pre", "x"))

  var style = window.getComputedStyle ? window.getComputedStyle(e) : e.currentStyle

  var data = {left: parseInt(style.paddingLeft), right: parseInt(style.paddingRight)}

  if (!isNaN(data.left) && !isNaN(data.right)) { display.cachedPaddingH = data }

  return data

}



function scrollGap(cm) { return scrollerGap - cm.display.nativeBarWidth }

function displayWidth(cm) {

  return cm.display.scroller.clientWidth - scrollGap(cm) - cm.display.barWidth

}

function displayHeight(cm) {

  return cm.display.scroller.clientHeight - scrollGap(cm) - cm.display.barHeight

}



// Ensure the lineView.wrapping.heights array is populated. This is

// an array of bottom offsets for the lines that make up a drawn

// line. When lineWrapping is on, there might be more than one

// height.

function ensureLineHeights(cm, lineView, rect) {

  var wrapping = cm.options.lineWrapping

  var curWidth = wrapping && displayWidth(cm)

  if (!lineView.measure.heights || wrapping && lineView.measure.width != curWidth) {

    var heights = lineView.measure.heights = []

    if (wrapping) {

      lineView.measure.width = curWidth

      var rects = lineView.text.firstChild.getClientRects()

      for (var i = 0; i < rects.length - 1; i++) {

        var cur = rects[i], next = rects[i + 1]

        if (Math.abs(cur.bottom - next.bottom) > 2)

          { heights.push((cur.bottom + next.top) / 2 - rect.top) }

      }

    }

    heights.push(rect.bottom - rect.top)

  }

}



// Find a line map (mapping character offsets to text nodes) and a

// measurement cache for the given line number. (A line view might

// contain multiple lines when collapsed ranges are present.)

function mapFromLineView(lineView, line, lineN) {

  if (lineView.line == line)

    { return {map: lineView.measure.map, cache: lineView.measure.cache} }

  for (var i = 0; i < lineView.rest.length; i++)

    { if (lineView.rest[i] == line)

      { return {map: lineView.measure.maps[i], cache: lineView.measure.caches[i]} } }

  for (var i$1 = 0; i$1 < lineView.rest.length; i$1++)

    { if (lineNo(lineView.rest[i$1]) > lineN)

      { return {map: lineView.measure.maps[i$1], cache: lineView.measure.caches[i$1], before: true} } }

}



// Render a line into the hidden node display.externalMeasured. Used

// when measurement is needed for a line that's not in the viewport.

function updateExternalMeasurement(cm, line) {

  line = visualLine(line)

  var lineN = lineNo(line)

  var view = cm.display.externalMeasured = new LineView(cm.doc, line, lineN)

  view.lineN = lineN

  var built = view.built = buildLineContent(cm, view)

  view.text = built.pre

  removeChildrenAndAdd(cm.display.lineMeasure, built.pre)

  return view

}



// Get a {top, bottom, left, right} box (in line-local coordinates)

// for a given character.

function measureChar(cm, line, ch, bias) {

  return measureCharPrepared(cm, prepareMeasureForLine(cm, line), ch, bias)

}



// Find a line view that corresponds to the given line number.

function findViewForLine(cm, lineN) {

  if (lineN >= cm.display.viewFrom && lineN < cm.display.viewTo)

    { return cm.display.view[findViewIndex(cm, lineN)] }

  var ext = cm.display.externalMeasured

  if (ext && lineN >= ext.lineN && lineN < ext.lineN + ext.size)

    { return ext }

}



// Measurement can be split in two steps, the set-up work that

// applies to the whole line, and the measurement of the actual

// character. Functions like coordsChar, that need to do a lot of

// measurements in a row, can thus ensure that the set-up work is

// only done once.

function prepareMeasureForLine(cm, line) {

  var lineN = lineNo(line)

  var view = findViewForLine(cm, lineN)

  if (view && !view.text) {

    view = null

  } else if (view && view.changes) {

    updateLineForChanges(cm, view, lineN, getDimensions(cm))

    cm.curOp.forceUpdate = true

  }

  if (!view)

    { view = updateExternalMeasurement(cm, line) }



  var info = mapFromLineView(view, line, lineN)

  return {

    line: line, view: view, rect: null,

    map: info.map, cache: info.cache, before: info.before,

    hasHeights: false

  }

}



// Given a prepared measurement object, measures the position of an

// actual character (or fetches it from the cache).

function measureCharPrepared(cm, prepared, ch, bias, varHeight) {

  if (prepared.before) { ch = -1 }

  var key = ch + (bias || ""), found

  if (prepared.cache.hasOwnProperty(key)) {

    found = prepared.cache[key]

  } else {

    if (!prepared.rect)

      { prepared.rect = prepared.view.text.getBoundingClientRect() }

    if (!prepared.hasHeights) {

      ensureLineHeights(cm, prepared.view, prepared.rect)

      prepared.hasHeights = true

    }

    found = measureCharInner(cm, prepared, ch, bias)

    if (!found.bogus) { prepared.cache[key] = found }

  }

  return {left: found.left, right: found.right,

          top: varHeight ? found.rtop : found.top,

          bottom: varHeight ? found.rbottom : found.bottom}

}



var nullRect = {left: 0, right: 0, top: 0, bottom: 0}



function nodeAndOffsetInLineMap(map, ch, bias) {

  var node, start, end, collapse, mStart, mEnd

  // First, search the line map for the text node corresponding to,

  // or closest to, the target character.

  for (var i = 0; i < map.length; i += 3) {

    mStart = map[i]

    mEnd = map[i + 1]

    if (ch < mStart) {

      start = 0; end = 1

      collapse = "left"

    } else if (ch < mEnd) {

      start = ch - mStart

      end = start + 1

    } else if (i == map.length - 3 || ch == mEnd && map[i + 3] > ch) {

      end = mEnd - mStart

      start = end - 1

      if (ch >= mEnd) { collapse = "right" }

    }

    if (start != null) {

      node = map[i + 2]

      if (mStart == mEnd && bias == (node.insertLeft ? "left" : "right"))

        { collapse = bias }

      if (bias == "left" && start == 0)

        { while (i && map[i - 2] == map[i - 3] && map[i - 1].insertLeft) {

          node = map[(i -= 3) + 2]

          collapse = "left"

        } }

      if (bias == "right" && start == mEnd - mStart)

        { while (i < map.length - 3 && map[i + 3] == map[i + 4] && !map[i + 5].insertLeft) {

          node = map[(i += 3) + 2]

          collapse = "right"

        } }

      break

    }

  }

  return {node: node, start: start, end: end, collapse: collapse, coverStart: mStart, coverEnd: mEnd}

}



function getUsefulRect(rects, bias) {

  var rect = nullRect

  if (bias == "left") { for (var i = 0; i < rects.length; i++) {

    if ((rect = rects[i]).left != rect.right) { break }

  } } else { for (var i$1 = rects.length - 1; i$1 >= 0; i$1--) {

    if ((rect = rects[i$1]).left != rect.right) { break }

  } }

  return rect

}



function measureCharInner(cm, prepared, ch, bias) {

  var place = nodeAndOffsetInLineMap(prepared.map, ch, bias)

  var node = place.node, start = place.start, end = place.end, collapse = place.collapse



  var rect

  if (node.nodeType == 3) { // If it is a text node, use a range to retrieve the coordinates.

    for (var i$1 = 0; i$1 < 4; i$1++) { // Retry a maximum of 4 times when nonsense rectangles are returned

      while (start && isExtendingChar(prepared.line.text.charAt(place.coverStart + start))) { --start }

      while (place.coverStart + end < place.coverEnd && isExtendingChar(prepared.line.text.charAt(place.coverStart + end))) { ++end }

      if (ie && ie_version < 9 && start == 0 && end == place.coverEnd - place.coverStart)

        { rect = node.parentNode.getBoundingClientRect() }

      else

        { rect = getUsefulRect(range(node, start, end).getClientRects(), bias) }

      if (rect.left || rect.right || start == 0) { break }

      end = start

      start = start - 1

      collapse = "right"

    }

    if (ie && ie_version < 11) { rect = maybeUpdateRectForZooming(cm.display.measure, rect) }

  } else { // If it is a widget, simply get the box for the whole widget.

    if (start > 0) { collapse = bias = "right" }

    var rects

    if (cm.options.lineWrapping && (rects = node.getClientRects()).length > 1)

      { rect = rects[bias == "right" ? rects.length - 1 : 0] }

    else

      { rect = node.getBoundingClientRect() }

  }

  if (ie && ie_version < 9 && !start && (!rect || !rect.left && !rect.right)) {

    var rSpan = node.parentNode.getClientRects()[0]

    if (rSpan)

      { rect = {left: rSpan.left, right: rSpan.left + charWidth(cm.display), top: rSpan.top, bottom: rSpan.bottom} }

    else

      { rect = nullRect }

  }



  var rtop = rect.top - prepared.rect.top, rbot = rect.bottom - prepared.rect.top

  var mid = (rtop + rbot) / 2

  var heights = prepared.view.measure.heights

  var i = 0

  for (; i < heights.length - 1; i++)

    { if (mid < heights[i]) { break } }

  var top = i ? heights[i - 1] : 0, bot = heights[i]

  var result = {left: (collapse == "right" ? rect.right : rect.left) - prepared.rect.left,

                right: (collapse == "left" ? rect.left : rect.right) - prepared.rect.left,

                top: top, bottom: bot}

  if (!rect.left && !rect.right) { result.bogus = true }

  if (!cm.options.singleCursorHeightPerLine) { result.rtop = rtop; result.rbottom = rbot }



  return result

}



// Work around problem with bounding client rects on ranges being

// returned incorrectly when zoomed on IE10 and below.

function maybeUpdateRectForZooming(measure, rect) {

  if (!window.screen || screen.logicalXDPI == null ||

      screen.logicalXDPI == screen.deviceXDPI || !hasBadZoomedRects(measure))

    { return rect }

  var scaleX = screen.logicalXDPI / screen.deviceXDPI

  var scaleY = screen.logicalYDPI / screen.deviceYDPI

  return {left: rect.left * scaleX, right: rect.right * scaleX,

          top: rect.top * scaleY, bottom: rect.bottom * scaleY}

}



function clearLineMeasurementCacheFor(lineView) {

  if (lineView.measure) {

    lineView.measure.cache = {}

    lineView.measure.heights = null

    if (lineView.rest) { for (var i = 0; i < lineView.rest.length; i++)

      { lineView.measure.caches[i] = {} } }

  }

}



function clearLineMeasurementCache(cm) {

  cm.display.externalMeasure = null

  removeChildren(cm.display.lineMeasure)

  for (var i = 0; i < cm.display.view.length; i++)

    { clearLineMeasurementCacheFor(cm.display.view[i]) }

}



function clearCaches(cm) {

  clearLineMeasurementCache(cm)

  cm.display.cachedCharWidth = cm.display.cachedTextHeight = cm.display.cachedPaddingH = null

  if (!cm.options.lineWrapping) { cm.display.maxLineChanged = true }

  cm.display.lineNumChars = null

}



function pageScrollX() {

  // Work around https://bugs.chromium.org/p/chromium/issues/detail?id=489206

  // which causes page_Offset and bounding client rects to use

  // different reference viewports and invalidate our calculations.

  if (chrome && android) { return -(document.body.getBoundingClientRect().left - parseInt(getComputedStyle(document.body).marginLeft)) }

  return window.pageXOffset || (document.documentElement || document.body).scrollLeft

}

function pageScrollY() {

  if (chrome && android) { return -(document.body.getBoundingClientRect().top - parseInt(getComputedStyle(document.body).marginTop)) }

  return window.pageYOffset || (document.documentElement || document.body).scrollTop

}



function widgetTopHeight(lineObj) {

  var height = 0

  if (lineObj.widgets) { for (var i = 0; i < lineObj.widgets.length; ++i) { if (lineObj.widgets[i].above)

    { height += widgetHeight(lineObj.widgets[i]) } } }

  return height

}



// Converts a {top, bottom, left, right} box from line-local

// coordinates into another coordinate system. Context may be one of

// "line", "div" (display.lineDiv), "local"./null (editor), "window",

// or "page".

function intoCoordSystem(cm, lineObj, rect, context, includeWidgets) {

  if (!includeWidgets) {

    var height = widgetTopHeight(lineObj)

    rect.top += height; rect.bottom += height

  }

  if (context == "line") { return rect }

  if (!context) { context = "local" }

  var yOff = heightAtLine(lineObj)

  if (context == "local") { yOff += paddingTop(cm.display) }

  else { yOff -= cm.display.viewOffset }

  if (context == "page" || context == "window") {

    var lOff = cm.display.lineSpace.getBoundingClientRect()

    yOff += lOff.top + (context == "window" ? 0 : pageScrollY())

    var xOff = lOff.left + (context == "window" ? 0 : pageScrollX())

    rect.left += xOff; rect.right += xOff

  }

  rect.top += yOff; rect.bottom += yOff

  return rect

}



// Coverts a box from "div" coords to another coordinate system.

// Context may be "window", "page", "div", or "local"./null.

function fromCoordSystem(cm, coords, context) {

  if (context == "div") { return coords }

  var left = coords.left, top = coords.top

  // First move into "page" coordinate system

  if (context == "page") {

    left -= pageScrollX()

    top -= pageScrollY()

  } else if (context == "local" || !context) {

    var localBox = cm.display.sizer.getBoundingClientRect()

    left += localBox.left

    top += localBox.top

  }



  var lineSpaceBox = cm.display.lineSpace.getBoundingClientRect()

  return {left: left - lineSpaceBox.left, top: top - lineSpaceBox.top}

}



function charCoords(cm, pos, context, lineObj, bias) {

  if (!lineObj) { lineObj = getLine(cm.doc, pos.line) }

  return intoCoordSystem(cm, lineObj, measureChar(cm, lineObj, pos.ch, bias), context)

}



// Returns a box for a given cursor position, which may have an

// 'other' property containing the position of the secondary cursor

// on a bidi boundary.

// A cursor Pos(line, char, "before") is on the same visual line as `char - 1`

// and after `char - 1` in writing order of `char - 1`

// A cursor Pos(line, char, "after") is on the same visual line as `char`

// and before `char` in writing order of `char`

// Examples (upper-case letters are RTL, lower-case are LTR):

//     Pos(0, 1, ...)

//     before   after

// ab     a|b     a|b

// aB     a|B     aB|

// Ab     |Ab     A|b

// AB     B|A     B|A

// Every position after the last character on a line is considered to stick

// to the last character on the line.

function cursorCoords(cm, pos, context, lineObj, preparedMeasure, varHeight) {

  lineObj = lineObj || getLine(cm.doc, pos.line)

  if (!preparedMeasure) { preparedMeasure = prepareMeasureForLine(cm, lineObj) }

  function get(ch, right) {

    var m = measureCharPrepared(cm, preparedMeasure, ch, right ? "right" : "left", varHeight)

    if (right) { m.left = m.right; } else { m.right = m.left }

    return intoCoordSystem(cm, lineObj, m, context)

  }

  var order = getOrder(lineObj, cm.doc.direction), ch = pos.ch, sticky = pos.sticky

  if (ch >= lineObj.text.length) {

    ch = lineObj.text.length

    sticky = "before"

  } else if (ch <= 0) {

    ch = 0

    sticky = "after"

  }

  if (!order) { return get(sticky == "before" ? ch - 1 : ch, sticky == "before") }



  function getBidi(ch, partPos, invert) {

    var part = order[partPos], right = part.level == 1

    return get(invert ? ch - 1 : ch, right != invert)

  }

  var partPos = getBidiPartAt(order, ch, sticky)

  var other = bidiOther

  var val = getBidi(ch, partPos, sticky == "before")

  if (other != null) { val.other = getBidi(ch, other, sticky != "before") }

  return val

}



// Used to cheaply estimate the coordinates for a position. Used for

// intermediate scroll updates.

function estimateCoords(cm, pos) {

  var left = 0

  pos = clipPos(cm.doc, pos)

  if (!cm.options.lineWrapping) { left = charWidth(cm.display) * pos.ch }

  var lineObj = getLine(cm.doc, pos.line)

  var top = heightAtLine(lineObj) + paddingTop(cm.display)

  return {left: left, right: left, top: top, bottom: top + lineObj.height}

}



// Positions returned by coordsChar contain some extra information.

// xRel is the relative x position of the input coordinates compared

// to the found position (so xRel > 0 means the coordinates are to

// the right of the character position, for example). When outside

// is true, that means the coordinates lie outside the line's

// vertical range.

function PosWithInfo(line, ch, sticky, outside, xRel) {

  var pos = Pos(line, ch, sticky)

  pos.xRel = xRel

  if (outside) { pos.outside = true }

  return pos

}



// Compute the character position closest to the given coordinates.

// Input must be lineSpace-local ("div" coordinate system).

function coordsChar(cm, x, y) {

  var doc = cm.doc

  y += cm.display.viewOffset

  if (y < 0) { return PosWithInfo(doc.first, 0, null, true, -1) }

  var lineN = lineAtHeight(doc, y), last = doc.first + doc.size - 1

  if (lineN > last)

    { return PosWithInfo(doc.first + doc.size - 1, getLine(doc, last).text.length, null, true, 1) }

  if (x < 0) { x = 0 }



  var lineObj = getLine(doc, lineN)

  for (;;) {

    var found = coordsCharInner(cm, lineObj, lineN, x, y)

    var merged = collapsedSpanAtEnd(lineObj)

    var mergedPos = merged && merged.find(0, true)

    if (merged && (found.ch > mergedPos.from.ch || found.ch == mergedPos.from.ch && found.xRel > 0))

      { lineN = lineNo(lineObj = mergedPos.to.line) }

    else

      { return found }

  }

}



function wrappedLineExtent(cm, lineObj, preparedMeasure, y) {

  y -= widgetTopHeight(lineObj)

  var end = lineObj.text.length

  var begin = findFirst(function (ch) { return measureCharPrepared(cm, preparedMeasure, ch - 1).bottom <= y; }, end, 0)

  end = findFirst(function (ch) { return measureCharPrepared(cm, preparedMeasure, ch).top > y; }, begin, end)

  return {begin: begin, end: end}

}



function wrappedLineExtentChar(cm, lineObj, preparedMeasure, target) {

  if (!preparedMeasure) { preparedMeasure = prepareMeasureForLine(cm, lineObj) }

  var targetTop = intoCoordSystem(cm, lineObj, measureCharPrepared(cm, preparedMeasure, target), "line").top

  return wrappedLineExtent(cm, lineObj, preparedMeasure, targetTop)

}



// Returns true if the given side of a box is after the given

// coordinates, in top-to-bottom, left-to-right order.

function boxIsAfter(box, x, y, left) {

  return box.bottom <= y ? false : box.top > y ? true : (left ? box.left : box.right) > x

}



function coordsCharInner(cm, lineObj, lineNo, x, y) {

  // Move y into line-local coordinate space

  y -= heightAtLine(lineObj)

  var preparedMeasure = prepareMeasureForLine(cm, lineObj)

  // When directly calling `measureCharPrepared`, we have to adjust

  // for the widgets at this line.

  var widgetHeight = widgetTopHeight(lineObj)

  var begin = 0, end = lineObj.text.length, ltr = true



  var order = getOrder(lineObj, cm.doc.direction)

  // If the line isn't plain left-to-right text, first figure out

  // which bidi section the coordinates fall into.

  if (order) {

    var part = (cm.options.lineWrapping ? coordsBidiPartWrapped : coordsBidiPart)

                 (cm, lineObj, lineNo, preparedMeasure, order, x, y)

    ltr = part.level != 1

    // The awkward -1 offsets are needed because findFirst (called

    // on these below) will treat its first bound as inclusive,

    // second as exclusive, but we want to actually address the

    // characters in the part's range

    begin = ltr ? part.from : part.to - 1

    end = ltr ? part.to : part.from - 1

  }



  // A binary search to find the first character whose bounding box

  // starts after the coordinates. If we run across any whose box wrap

  // the coordinates, store that.

  var chAround = null, boxAround = null

  var ch = findFirst(function (ch) {

    var box = measureCharPrepared(cm, preparedMeasure, ch)

    box.top += widgetHeight; box.bottom += widgetHeight

    if (!boxIsAfter(box, x, y, false)) { return false }

    if (box.top <= y && box.left <= x) {

      chAround = ch

      boxAround = box

    }

    return true

  }, begin, end)



  var baseX, sticky, outside = false

  // If a box around the coordinates was found, use that

  if (boxAround) {

    // Distinguish coordinates nearer to the left or right side of the box

    var atLeft = x - boxAround.left < boxAround.right - x, atStart = atLeft == ltr

    ch = chAround + (atStart ? 0 : 1)

    sticky = atStart ? "after" : "before"

    baseX = atLeft ? boxAround.left : boxAround.right

  } else {

    // (Adjust for extended bound, if necessary.)

    if (!ltr && (ch == end || ch == begin)) { ch++ }

    // To determine which side to associate with, get the box to the

    // left of the character and compare it's vertical position to the

    // coordinates

    sticky = ch == 0 ? "after" : ch == lineObj.text.length ? "before" :

      (measureCharPrepared(cm, preparedMeasure, ch - (ltr ? 1 : 0)).bottom + widgetHeight <= y) == ltr ?

      "after" : "before"

    // Now get accurate coordinates for this place, in order to get a

    // base X position

    var coords = cursorCoords(cm, Pos(lineNo, ch, sticky), "line", lineObj, preparedMeasure)

    baseX = coords.left

    outside = y < coords.top || y >= coords.bottom

  }



  ch = skipExtendingChars(lineObj.text, ch, 1)

  return PosWithInfo(lineNo, ch, sticky, outside, x - baseX)

}



function coordsBidiPart(cm, lineObj, lineNo, preparedMeasure, order, x, y) {

  // Bidi parts are sorted left-to-right, and in a non-line-wrapping

  // situation, we can take this ordering to correspond to the visual

  // ordering. This finds the first part whose end is after the given

  // coordinates.

  var index = findFirst(function (i) {

    var part = order[i], ltr = part.level != 1

    return boxIsAfter(cursorCoords(cm, Pos(lineNo, ltr ? part.to : part.from, ltr ? "before" : "after"),

                                   "line", lineObj, preparedMeasure), x, y, true)

  }, 0, order.length - 1)

  var part = order[index]

  // If this isn't the first part, the part's start is also after

  // the coordinates, and the coordinates aren't on the same line as

  // that start, move one part back.

  if (index > 0) {

    var ltr = part.level != 1

    var start = cursorCoords(cm, Pos(lineNo, ltr ? part.from : part.to, ltr ? "after" : "before"),

                             "line", lineObj, preparedMeasure)

    if (boxIsAfter(start, x, y, true) && start.top > y)

      { part = order[index - 1] }

  }

  return part

}



function coordsBidiPartWrapped(cm, lineObj, _lineNo, preparedMeasure, order, x, y) {

  // In a wrapped line, rtl text on wrapping boundaries can do things

  // that don't correspond to the ordering in our `order` array at

  // all, so a binary search doesn't work, and we want to return a

  // part that only spans one line so that the binary search in

  // coordsCharInner is safe. As such, we first find the extent of the

  // wrapped line, and then do a flat search in which we discard any

  // spans that aren't on the line.

  var ref = wrappedLineExtent(cm, lineObj, preparedMeasure, y);

  var begin = ref.begin;

  var end = ref.end;

  if (/\s/.test(lineObj.text.charAt(end - 1))) { end-- }

  var part = null, closestDist = null

  for (var i = 0; i < order.length; i++) {

    var p = order[i]

    if (p.from >= end || p.to <= begin) { continue }

    var ltr = p.level != 1

    var endX = measureCharPrepared(cm, preparedMeasure, ltr ? Math.min(end, p.to) - 1 : Math.max(begin, p.from)).right

    // Weigh against spans ending before this, so that they are only

    // picked if nothing ends after

    var dist = endX < x ? x - endX + 1e9 : endX - x

    if (!part || closestDist > dist) {

      part = p

      closestDist = dist

    }

  }

  if (!part) { part = order[order.length - 1] }

  // Clip the part to the wrapped line.

  if (part.from < begin) { part = {from: begin, to: part.to, level: part.level} }

  if (part.to > end) { part = {from: part.from, to: end, level: part.level} }

  return part

}



var measureText

// Compute the default text height.

function textHeight(display) {

  if (display.cachedTextHeight != null) { return display.cachedTextHeight }

  if (measureText == null) {

    measureText = elt("pre")

    // Measure a bunch of lines, for browsers that compute

    // fractional heights.

    for (var i = 0; i < 49; ++i) {

      measureText.appendChild(document.createTextNode("x"))

      measureText.appendChild(elt("br"))

    }

    measureText.appendChild(document.createTextNode("x"))

  }

  removeChildrenAndAdd(display.measure, measureText)

  var height = measureText.offsetHeight / 50

  if (height > 3) { display.cachedTextHeight = height }

  removeChildren(display.measure)

  return height || 1

}



// Compute the default character width.

function charWidth(display) {

  if (display.cachedCharWidth != null) { return display.cachedCharWidth }

  var anchor = elt("span", "xxxxxxxxxx")

  var pre = elt("pre", [anchor])

  removeChildrenAndAdd(display.measure, pre)

  var rect = anchor.getBoundingClientRect(), width = (rect.right - rect.left) / 10

  if (width > 2) { display.cachedCharWidth = width }

  return width || 10

}



// Do a bulk-read of the DOM positions and sizes needed to draw the

// view, so that we don't interleave reading and writing to the DOM.

function getDimensions(cm) {

  var d = cm.display, left = {}, width = {}

  var gutterLeft = d.gutters.clientLeft

  for (var n = d.gutters.firstChild, i = 0; n; n = n.nextSibling, ++i) {

    left[cm.options.gutters[i]] = n.offsetLeft + n.clientLeft + gutterLeft

    width[cm.options.gutters[i]] = n.clientWidth

  }

  return {fixedPos: compensateForHScroll(d),

          gutterTotalWidth: d.gutters.offsetWidth,

          gutterLeft: left,

          gutterWidth: width,

          wrapperWidth: d.wrapper.clientWidth}

}



// Computes display.scroller.scrollLeft + display.gutters.offsetWidth,

// but using getBoundingClientRect to get a sub-pixel-accurate

// result.

function compensateForHScroll(display) {

  return display.scroller.getBoundingClientRect().left - display.sizer.getBoundingClientRect().left

}



// Returns a function that estimates the height of a line, to use as

// first approximation until the line becomes visible (and is thus

// properly measurable).

function estimateHeight(cm) {

  var th = textHeight(cm.display), wrapping = cm.options.lineWrapping

  var perLine = wrapping && Math.max(5, cm.display.scroller.clientWidth / charWidth(cm.display) - 3)

  return function (line) {

    if (lineIsHidden(cm.doc, line)) { return 0 }



    var widgetsHeight = 0

    if (line.widgets) { for (var i = 0; i < line.widgets.length; i++) {

      if (line.widgets[i].height) { widgetsHeight += line.widgets[i].height }

    } }



    if (wrapping)

      { return widgetsHeight + (Math.ceil(line.text.length / perLine) || 1) * th }

    else

      { return widgetsHeight + th }

  }

}



function estimateLineHeights(cm) {

  var doc = cm.doc, est = estimateHeight(cm)

  doc.iter(function (line) {

    var estHeight = est(line)

    if (estHeight != line.height) { updateLineHeight(line, estHeight) }

  })

}



// Given a mouse event, find the corresponding position. If liberal

// is false, it checks whether a gutter or scrollbar was clicked,

// and returns null if it was. forRect is used by rectangular

// selections, and tries to estimate a character position even for

// coordinates beyond the right of the text.

function posFromMouse(cm, e, liberal, forRect) {

  var display = cm.display

  if (!liberal && e_target(e).getAttribute("cm-not-content") == "true") { return null }



  var x, y, space = display.lineSpace.getBoundingClientRect()

  // Fails unpredictably on IE[67] when mouse is dragged around quickly.

  try { x = e.clientX - space.left; y = e.clientY - space.top }

  catch (e) { return null }

  var coords = coordsChar(cm, x, y), line

  if (forRect && coords.xRel == 1 && (line = getLine(cm.doc, coords.line).text).length == coords.ch) {

    var colDiff = countColumn(line, line.length, cm.options.tabSize) - line.length

    coords = Pos(coords.line, Math.max(0, Math.round((x - paddingH(cm.display).left) / charWidth(cm.display)) - colDiff))

  }

  return coords

}



// Find the view element corresponding to a given line. Return null

// when the line isn't visible.

function findViewIndex(cm, n) {

  if (n >= cm.display.viewTo) { return null }

  n -= cm.display.viewFrom

  if (n < 0) { return null }

  var view = cm.display.view

  for (var i = 0; i < view.length; i++) {

    n -= view[i].size

    if (n < 0) { return i }

  }

}



function updateSelection(cm) {

  cm.display.input.showSelection(cm.display.input.prepareSelection())

}



function prepareSelection(cm, primary) {

  if ( primary === void 0 ) primary = true;



  var doc = cm.doc, result = {}

  var curFragment = result.cursors = document.createDocumentFragment()

  var selFragment = result.selection = document.createDocumentFragment()



  for (var i = 0; i < doc.sel.ranges.length; i++) {

    if (!primary && i == doc.sel.primIndex) { continue }

    var range = doc.sel.ranges[i]

    if (range.from().line >= cm.display.viewTo || range.to().line < cm.display.viewFrom) { continue }

    var collapsed = range.empty()

    if (collapsed || cm.options.showCursorWhenSelecting)

      { drawSelectionCursor(cm, range.head, curFragment) }

    if (!collapsed)

      { drawSelectionRange(cm, range, selFragment) }

  }

  return result

}



// Draws a cursor for the given range

function drawSelectionCursor(cm, head, output) {

  var pos = cursorCoords(cm, head, "div", null, null, !cm.options.singleCursorHeightPerLine)



  var cursor = output.appendChild(elt("div", "\u00a0", "CodeMirror-cursor"))

  cursor.style.left = pos.left + "px"

  cursor.style.top = pos.top + "px"

  cursor.style.height = Math.max(0, pos.bottom - pos.top) * cm.options.cursorHeight + "px"



  if (pos.other) {

    // Secondary cursor, shown when on a 'jump' in bi-directional text

    var otherCursor = output.appendChild(elt("div", "\u00a0", "CodeMirror-cursor CodeMirror-secondarycursor"))

    otherCursor.style.display = ""

    otherCursor.style.left = pos.other.left + "px"

    otherCursor.style.top = pos.other.top + "px"

    otherCursor.style.height = (pos.other.bottom - pos.other.top) * .85 + "px"

  }

}



function cmpCoords(a, b) { return a.top - b.top || a.left - b.left }



// Draws the given range as a highlighted selection

function drawSelectionRange(cm, range, output) {

  var display = cm.display, doc = cm.doc

  var fragment = document.createDocumentFragment()

  var padding = paddingH(cm.display), leftSide = padding.left

  var rightSide = Math.max(display.sizerWidth, displayWidth(cm) - display.sizer.offsetLeft) - padding.right

  var docLTR = doc.direction == "ltr"



  function add(left, top, width, bottom) {

    if (top < 0) { top = 0 }

    top = Math.round(top)

    bottom = Math.round(bottom)

    fragment.appendChild(elt("div", null, "CodeMirror-selected", ("position: absolute; left: " + left + "px;\n                             top: " + top + "px; width: " + (width == null ? rightSide - left : width) + "px;\n                             height: " + (bottom - top) + "px")))

  }



  function drawForLine(line, fromArg, toArg) {

    var lineObj = getLine(doc, line)

    var lineLen = lineObj.text.length

    var start, end

    function coords(ch, bias) {

      return charCoords(cm, Pos(line, ch), "div", lineObj, bias)

    }



    function wrapX(pos, dir, side) {

      var extent = wrappedLineExtentChar(cm, lineObj, null, pos)

      var prop = (dir == "ltr") == (side == "after") ? "left" : "right"

      var ch = side == "after" ? extent.begin : extent.end - (/\s/.test(lineObj.text.charAt(extent.end - 1)) ? 2 : 1)

      return coords(ch, prop)[prop]

    }



    var order = getOrder(lineObj, doc.direction)

    iterateBidiSections(order, fromArg || 0, toArg == null ? lineLen : toArg, function (from, to, dir, i) {

      var ltr = dir == "ltr"

      var fromPos = coords(from, ltr ? "left" : "right")

      var toPos = coords(to - 1, ltr ? "right" : "left")



      var openStart = fromArg == null && from == 0, openEnd = toArg == null && to == lineLen

      var first = i == 0, last = !order || i == order.length - 1

      if (toPos.top - fromPos.top <= 3) { // Single line

        var openLeft = (docLTR ? openStart : openEnd) && first

        var openRight = (docLTR ? openEnd : openStart) && last

        var left = openLeft ? leftSide : (ltr ? fromPos : toPos).left

        var right = openRight ? rightSide : (ltr ? toPos : fromPos).right

        add(left, fromPos.top, right - left, fromPos.bottom)

      } else { // Multiple lines

        var topLeft, topRight, botLeft, botRight

        if (ltr) {

          topLeft = docLTR && openStart && first ? leftSide : fromPos.left

          topRight = docLTR ? rightSide : wrapX(from, dir, "before")

          botLeft = docLTR ? leftSide : wrapX(to, dir, "after")

          botRight = docLTR && openEnd && last ? rightSide : toPos.right

        } else {

          topLeft = !docLTR ? leftSide : wrapX(from, dir, "before")

          topRight = !docLTR && openStart && first ? rightSide : fromPos.right

          botLeft = !docLTR && openEnd && last ? leftSide : toPos.left

          botRight = !docLTR ? rightSide : wrapX(to, dir, "after")

        }

        add(topLeft, fromPos.top, topRight - topLeft, fromPos.bottom)

        if (fromPos.bottom < toPos.top) { add(leftSide, fromPos.bottom, null, toPos.top) }

        add(botLeft, toPos.top, botRight - botLeft, toPos.bottom)

      }



      if (!start || cmpCoords(fromPos, start) < 0) { start = fromPos }

      if (cmpCoords(toPos, start) < 0) { start = toPos }

      if (!end || cmpCoords(fromPos, end) < 0) { end = fromPos }

      if (cmpCoords(toPos, end) < 0) { end = toPos }

    })

    return {start: start, end: end}

  }



  var sFrom = range.from(), sTo = range.to()

  if (sFrom.line == sTo.line) {

    drawForLine(sFrom.line, sFrom.ch, sTo.ch)

  } else {

    var fromLine = getLine(doc, sFrom.line), toLine = getLine(doc, sTo.line)

    var singleVLine = visualLine(fromLine) == visualLine(toLine)

    var leftEnd = drawForLine(sFrom.line, sFrom.ch, singleVLine ? fromLine.text.length + 1 : null).end

    var rightStart = drawForLine(sTo.line, singleVLine ? 0 : null, sTo.ch).start

    if (singleVLine) {

      if (leftEnd.top < rightStart.top - 2) {

        add(leftEnd.right, leftEnd.top, null, leftEnd.bottom)

        add(leftSide, rightStart.top, rightStart.left, rightStart.bottom)

      } else {

        add(leftEnd.right, leftEnd.top, rightStart.left - leftEnd.right, leftEnd.bottom)

      }

    }

    if (leftEnd.bottom < rightStart.top)

      { add(leftSide, leftEnd.bottom, null, rightStart.top) }

  }



  output.appendChild(fragment)

}



// Cursor-blinking

function restartBlink(cm) {

  if (!cm.state.focused) { return }

  var display = cm.display

  clearInterval(display.blinker)

  var on = true

  display.cursorDiv.style.visibility = ""

  if (cm.options.cursorBlinkRate > 0)

    { display.blinker = setInterval(function () { return display.cursorDiv.style.visibility = (on = !on) ? "" : "hidden"; },

      cm.options.cursorBlinkRate) }

  else if (cm.options.cursorBlinkRate < 0)

    { display.cursorDiv.style.visibility = "hidden" }

}



function ensureFocus(cm) {

  if (!cm.state.focused) { cm.display.input.focus(); onFocus(cm) }

}



function delayBlurEvent(cm) {

  cm.state.delayingBlurEvent = true

  setTimeout(function () { if (cm.state.delayingBlurEvent) {

    cm.state.delayingBlurEvent = false

    onBlur(cm)

  } }, 100)

}



function onFocus(cm, e) {

  if (cm.state.delayingBlurEvent) { cm.state.delayingBlurEvent = false }



  if (cm.options.readOnly == "nocursor") { return }

  if (!cm.state.focused) {

    signal(cm, "focus", cm, e)

    cm.state.focused = true

    addClass(cm.display.wrapper, "CodeMirror-focused")

    // This test prevents this from firing when a context

    // menu is closed (since the input reset would kill the

    // select-all detection hack)

    if (!cm.curOp && cm.display.selForContextMenu != cm.doc.sel) {

      cm.display.input.reset()

      if (webkit) { setTimeout(function () { return cm.display.input.reset(true); }, 20) } // Issue #1730

    }

    cm.display.input.receivedFocus()

  }

  restartBlink(cm)

}

function onBlur(cm, e) {

  if (cm.state.delayingBlurEvent) { return }



  if (cm.state.focused) {

    signal(cm, "blur", cm, e)

    cm.state.focused = false

    rmClass(cm.display.wrapper, "CodeMirror-focused")

  }

  clearInterval(cm.display.blinker)

  setTimeout(function () { if (!cm.state.focused) { cm.display.shift = false } }, 150)

}



// Read the actual heights of the rendered lines, and update their

// stored heights to match.

function updateHeightsInViewport(cm) {

  var display = cm.display

  var prevBottom = display.lineDiv.offsetTop

  for (var i = 0; i < display.view.length; i++) {

    var cur = display.view[i], height = (void 0)

    if (cur.hidden) { continue }

    if (ie && ie_version < 8) {

      var bot = cur.node.offsetTop + cur.node.offsetHeight

      height = bot - prevBottom

      prevBottom = bot

    } else {

      var box = cur.node.getBoundingClientRect()

      height = box.bottom - box.top

    }

    var diff = cur.line.height - height

    if (height < 2) { height = textHeight(display) }

    if (diff > .005 || diff < -.005) {

      updateLineHeight(cur.line, height)

      updateWidgetHeight(cur.line)

      if (cur.rest) { for (var j = 0; j < cur.rest.length; j++)

        { updateWidgetHeight(cur.rest[j]) } }

    }

  }

}



// Read and store the height of line widgets associated with the

// given line.

function updateWidgetHeight(line) {

  if (line.widgets) { for (var i = 0; i < line.widgets.length; ++i) {

    var w = line.widgets[i], parent = w.node.parentNode

    if (parent) { w.height = parent.offsetHeight }

  } }

}



// Compute the lines that are visible in a given viewport (defaults

// the the current scroll position). viewport may contain top,

// height, and ensure (see op.scrollToPos) properties.

function visibleLines(display, doc, viewport) {

  var top = viewport && viewport.top != null ? Math.max(0, viewport.top) : display.scroller.scrollTop

  top = Math.floor(top - paddingTop(display))

  var bottom = viewport && viewport.bottom != null ? viewport.bottom : top + display.wrapper.clientHeight



  var from = lineAtHeight(doc, top), to = lineAtHeight(doc, bottom)

  // Ensure is a {from: {line, ch}, to: {line, ch}} object, and

  // forces those lines into the viewport (if possible).

  if (viewport && viewport.ensure) {

    var ensureFrom = viewport.ensure.from.line, ensureTo = viewport.ensure.to.line

    if (ensureFrom < from) {

      from = ensureFrom

      to = lineAtHeight(doc, heightAtLine(getLine(doc, ensureFrom)) + display.wrapper.clientHeight)

    } else if (Math.min(ensureTo, doc.lastLine()) >= to) {

      from = lineAtHeight(doc, heightAtLine(getLine(doc, ensureTo)) - display.wrapper.clientHeight)

      to = ensureTo

    }

  }

  return {from: from, to: Math.max(to, from + 1)}

}



// Re-align line numbers and gutter marks to compensate for

// horizontal scrolling.

function alignHorizontally(cm) {

  var display = cm.display, view = display.view

  if (!display.alignWidgets && (!display.gutters.firstChild || !cm.options.fixedGutter)) { return }

  var comp = compensateForHScroll(display) - display.scroller.scrollLeft + cm.doc.scrollLeft

  var gutterW = display.gutters.offsetWidth, left = comp + "px"

  for (var i = 0; i < view.length; i++) { if (!view[i].hidden) {

    if (cm.options.fixedGutter) {

      if (view[i].gutter)

        { view[i].gutter.style.left = left }

      if (view[i].gutterBackground)

        { view[i].gutterBackground.style.left = left }

    }

    var align = view[i].alignable

    if (align) { for (var j = 0; j < align.length; j++)

      { align[j].style.left = left } }

  } }

  if (cm.options.fixedGutter)

    { display.gutters.style.left = (comp + gutterW) + "px" }

}



// Used to ensure that the line number gutter is still the right

// size for the current document size. Returns true when an update

// is needed.

function maybeUpdateLineNumberWidth(cm) {

  if (!cm.options.lineNumbers) { return false }

  var doc = cm.doc, last = lineNumberFor(cm.options, doc.first + doc.size - 1), display = cm.display

  if (last.length != display.lineNumChars) {

    var test = display.measure.appendChild(elt("div", [elt("div", last)],

                                               "CodeMirror-linenumber CodeMirror-gutter-elt"))

    var innerW = test.firstChild.offsetWidth, padding = test.offsetWidth - innerW

    display.lineGutter.style.width = ""

    display.lineNumInnerWidth = Math.max(innerW, display.lineGutter.offsetWidth - padding) + 1

    display.lineNumWidth = display.lineNumInnerWidth + padding

    display.lineNumChars = display.lineNumInnerWidth ? last.length : -1

    display.lineGutter.style.width = display.lineNumWidth + "px"

    updateGutterSpace(cm)

    return true

  }

  return false

}



// SCROLLING THINGS INTO VIEW



// If an editor sits on the top or bottom of the window, partially

// scrolled out of view, this ensures that the cursor is visible.

function maybeScrollWindow(cm, rect) {

  if (signalDOMEvent(cm, "scrollCursorIntoView")) { return }



  var display = cm.display, box = display.sizer.getBoundingClientRect(), doScroll = null

  if (rect.top + box.top < 0) { doScroll = true }

  else if (rect.bottom + box.top > (window.innerHeight || document.documentElement.clientHeight)) { doScroll = false }

  if (doScroll != null && !phantom) {

    var scrollNode = elt("div", "\u200b", null, ("position: absolute;\n                         top: " + (rect.top - display.viewOffset - paddingTop(cm.display)) + "px;\n                         height: " + (rect.bottom - rect.top + scrollGap(cm) + display.barHeight) + "px;\n                         left: " + (rect.left) + "px; width: " + (Math.max(2, rect.right - rect.left)) + "px;"))

    cm.display.lineSpace.appendChild(scrollNode)

    scrollNode.scrollIntoView(doScroll)

    cm.display.lineSpace.removeChild(scrollNode)

  }

}



// Scroll a given position into view (immediately), verifying that

// it actually became visible (as line heights are accurately

// measured, the position of something may 'drift' during drawing).

function scrollPosIntoView(cm, pos, end, margin) {

  if (margin == null) { margin = 0 }

  var rect

  if (!cm.options.lineWrapping && pos == end) {

    // Set pos and end to the cursor positions around the character pos sticks to

    // If pos.sticky == "before", that is around pos.ch - 1, otherwise around pos.ch

    // If pos == Pos(_, 0, "before"), pos and end are unchanged

    pos = pos.ch ? Pos(pos.line, pos.sticky == "before" ? pos.ch - 1 : pos.ch, "after") : pos

    end = pos.sticky == "before" ? Pos(pos.line, pos.ch + 1, "before") : pos

  }

  for (var limit = 0; limit < 5; limit++) {

    var changed = false

    var coords = cursorCoords(cm, pos)

    var endCoords = !end || end == pos ? coords : cursorCoords(cm, end)

    rect = {left: Math.min(coords.left, endCoords.left),

            top: Math.min(coords.top, endCoords.top) - margin,

            right: Math.max(coords.left, endCoords.left),

            bottom: Math.max(coords.bottom, endCoords.bottom) + margin}

    var scrollPos = calculateScrollPos(cm, rect)

    var startTop = cm.doc.scrollTop, startLeft = cm.doc.scrollLeft

    if (scrollPos.scrollTop != null) {

      updateScrollTop(cm, scrollPos.scrollTop)

      if (Math.abs(cm.doc.scrollTop - startTop) > 1) { changed = true }

    }

    if (scrollPos.scrollLeft != null) {

      setScrollLeft(cm, scrollPos.scrollLeft)

      if (Math.abs(cm.doc.scrollLeft - startLeft) > 1) { changed = true }

    }

    if (!changed) { break }

  }

  return rect

}



// Scroll a given set of coordinates into view (immediately).

function scrollIntoView(cm, rect) {

  var scrollPos = calculateScrollPos(cm, rect)

  if (scrollPos.scrollTop != null) { updateScrollTop(cm, scrollPos.scrollTop) }

  if (scrollPos.scrollLeft != null) { setScrollLeft(cm, scrollPos.scrollLeft) }

}



// Calculate a new scroll position needed to scroll the given

// rectangle into view. Returns an object with scrollTop and

// scrollLeft properties. When these are undefined, the

// vertical/horizontal position does not need to be adjusted.

function calculateScrollPos(cm, rect) {

  var display = cm.display, snapMargin = textHeight(cm.display)

  if (rect.top < 0) { rect.top = 0 }

  var screentop = cm.curOp && cm.curOp.scrollTop != null ? cm.curOp.scrollTop : display.scroller.scrollTop

  var screen = displayHeight(cm), result = {}

  if (rect.bottom - rect.top > screen) { rect.bottom = rect.top + screen }

  var docBottom = cm.doc.height + paddingVert(display)

  var atTop = rect.top < snapMargin, atBottom = rect.bottom > docBottom - snapMargin

  if (rect.top < screentop) {

    result.scrollTop = atTop ? 0 : rect.top

  } else if (rect.bottom > screentop + screen) {

    var newTop = Math.min(rect.top, (atBottom ? docBottom : rect.bottom) - screen)

    if (newTop != screentop) { result.scrollTop = newTop }

  }



  var screenleft = cm.curOp && cm.curOp.scrollLeft != null ? cm.curOp.scrollLeft : display.scroller.scrollLeft

  var screenw = displayWidth(cm) - (cm.options.fixedGutter ? display.gutters.offsetWidth : 0)

  var tooWide = rect.right - rect.left > screenw

  if (tooWide) { rect.right = rect.left + screenw }

  if (rect.left < 10)

    { result.scrollLeft = 0 }

  else if (rect.left < screenleft)

    { result.scrollLeft = Math.max(0, rect.left - (tooWide ? 0 : 10)) }

  else if (rect.right > screenw + screenleft - 3)

    { result.scrollLeft = rect.right + (tooWide ? 0 : 10) - screenw }

  return result

}



// Store a relative adjustment to the scroll position in the current

// operation (to be applied when the operation finishes).

function addToScrollTop(cm, top) {

  if (top == null) { return }

  resolveScrollToPos(cm)

  cm.curOp.scrollTop = (cm.curOp.scrollTop == null ? cm.doc.scrollTop : cm.curOp.scrollTop) + top

}



// Make sure that at the end of the operation the current cursor is

// shown.

function ensureCursorVisible(cm) {

  resolveScrollToPos(cm)

  var cur = cm.getCursor()

  cm.curOp.scrollToPos = {from: cur, to: cur, margin: cm.options.cursorScrollMargin}

}



function scrollToCoords(cm, x, y) {

  if (x != null || y != null) { resolveScrollToPos(cm) }

  if (x != null) { cm.curOp.scrollLeft = x }

  if (y != null) { cm.curOp.scrollTop = y }

}



function scrollToRange(cm, range) {

  resolveScrollToPos(cm)

  cm.curOp.scrollToPos = range

}



// When an operation has its scrollToPos property set, and another

// scroll action is applied before the end of the operation, this

// 'simulates' scrolling that position into view in a cheap way, so

// that the effect of intermediate scroll commands is not ignored.

function resolveScrollToPos(cm) {

  var range = cm.curOp.scrollToPos

  if (range) {

    cm.curOp.scrollToPos = null

    var from = estimateCoords(cm, range.from), to = estimateCoords(cm, range.to)

    scrollToCoordsRange(cm, from, to, range.margin)

  }

}



function scrollToCoordsRange(cm, from, to, margin) {

  var sPos = calculateScrollPos(cm, {

    left: Math.min(from.left, to.left),

    top: Math.min(from.top, to.top) - margin,

    right: Math.max(from.right, to.right),

    bottom: Math.max(from.bottom, to.bottom) + margin

  })

  scrollToCoords(cm, sPos.scrollLeft, sPos.scrollTop)

}



// Sync the scrollable area and scrollbars, ensure the viewport

// covers the visible area.

function updateScrollTop(cm, val) {

  if (Math.abs(cm.doc.scrollTop - val) < 2) { return }

  if (!gecko) { updateDisplaySimple(cm, {top: val}) }

  setScrollTop(cm, val, true)

  if (gecko) { updateDisplaySimple(cm) }

  startWorker(cm, 100)

}



function setScrollTop(cm, val, forceScroll) {

  val = Math.min(cm.display.scroller.scrollHeight - cm.display.scroller.clientHeight, val)

  if (cm.display.scroller.scrollTop == val && !forceScroll) { return }

  cm.doc.scrollTop = val

  cm.display.scrollbars.setScrollTop(val)

  if (cm.display.scroller.scrollTop != val) { cm.display.scroller.scrollTop = val }

}



// Sync scroller and scrollbar, ensure the gutter elements are

// aligned.

function setScrollLeft(cm, val, isScroller, forceScroll) {

  val = Math.min(val, cm.display.scroller.scrollWidth - cm.display.scroller.clientWidth)

  if ((isScroller ? val == cm.doc.scrollLeft : Math.abs(cm.doc.scrollLeft - val) < 2) && !forceScroll) { return }

  cm.doc.scrollLeft = val

  alignHorizontally(cm)

  if (cm.display.scroller.scrollLeft != val) { cm.display.scroller.scrollLeft = val }

  cm.display.scrollbars.setScrollLeft(val)

}



// SCROLLBARS



// Prepare DOM reads needed to update the scrollbars. Done in one

// shot to minimize update/measure roundtrips.

function measureForScrollbars(cm) {

  var d = cm.display, gutterW = d.gutters.offsetWidth

  var docH = Math.round(cm.doc.height + paddingVert(cm.display))

  return {

    clientHeight: d.scroller.clientHeight,

    viewHeight: d.wrapper.clientHeight,

    scrollWidth: d.scroller.scrollWidth, clientWidth: d.scroller.clientWidth,

    viewWidth: d.wrapper.clientWidth,

    barLeft: cm.options.fixedGutter ? gutterW : 0,

    docHeight: docH,

    scrollHeight: docH + scrollGap(cm) + d.barHeight,

    nativeBarWidth: d.nativeBarWidth,

    gutterWidth: gutterW

  }

}



var NativeScrollbars = function(place, scroll, cm) {

  this.cm = cm

  var vert = this.vert = elt("div", [elt("div", null, null, "min-width: 1px")], "CodeMirror-vscrollbar")

  var horiz = this.horiz = elt("div", [elt("div", null, null, "height: 100%; min-height: 1px")], "CodeMirror-hscrollbar")

  place(vert); place(horiz)



  on(vert, "scroll", function () {

    if (vert.clientHeight) { scroll(vert.scrollTop, "vertical") }

  })

  on(horiz, "scroll", function () {

    if (horiz.clientWidth) { scroll(horiz.scrollLeft, "horizontal") }

  })



  this.checkedZeroWidth = false

  // Need to set a minimum width to see the scrollbar on IE7 (but must not set it on IE8).

  if (ie && ie_version < 8) { this.horiz.style.minHeight = this.vert.style.minWidth = "18px" }

};



NativeScrollbars.prototype.update = function (measure) {

  var needsH = measure.scrollWidth > measure.clientWidth + 1

  var needsV = measure.scrollHeight > measure.clientHeight + 1

  var sWidth = measure.nativeBarWidth



  if (needsV) {

    this.vert.style.display = "block"

    this.vert.style.bottom = needsH ? sWidth + "px" : "0"

    var totalHeight = measure.viewHeight - (needsH ? sWidth : 0)

    // A bug in IE8 can cause this value to be negative, so guard it.

    this.vert.firstChild.style.height =

      Math.max(0, measure.scrollHeight - measure.clientHeight + totalHeight) + "px"

  } else {

    this.vert.style.display = ""

    this.vert.firstChild.style.height = "0"

  }



  if (needsH) {

    this.horiz.style.display = "block"

    this.horiz.style.right = needsV ? sWidth + "px" : "0"

    this.horiz.style.left = measure.barLeft + "px"

    var totalWidth = measure.viewWidth - measure.barLeft - (needsV ? sWidth : 0)

    this.horiz.firstChild.style.width =

      Math.max(0, measure.scrollWidth - measure.clientWidth + totalWidth) + "px"

  } else {

    this.horiz.style.display = ""

    this.horiz.firstChild.style.width = "0"

  }



  if (!this.checkedZeroWidth && measure.clientHeight > 0) {

    if (sWidth == 0) { this.zeroWidthHack() }

    this.checkedZeroWidth = true

  }



  return {right: needsV ? sWidth : 0, bottom: needsH ? sWidth : 0}

};



NativeScrollbars.prototype.setScrollLeft = function (pos) {

  if (this.horiz.scrollLeft != pos) { this.horiz.scrollLeft = pos }

  if (this.disableHoriz) { this.enableZeroWidthBar(this.horiz, this.disableHoriz, "horiz") }

};



NativeScrollbars.prototype.setScrollTop = function (pos) {

  if (this.vert.scrollTop != pos) { this.vert.scrollTop = pos }

  if (this.disableVert) { this.enableZeroWidthBar(this.vert, this.disableVert, "vert") }

};



NativeScrollbars.prototype.zeroWidthHack = function () {

  var w = mac && !mac_geMountainLion ? "12px" : "18px"

  this.horiz.style.height = this.vert.style.width = w

  this.horiz.style.pointerEvents = this.vert.style.pointerEvents = "none"

  this.disableHoriz = new Delayed

  this.disableVert = new Delayed

};



NativeScrollbars.prototype.enableZeroWidthBar = function (bar, delay, type) {

  bar.style.pointerEvents = "auto"

  function maybeDisable() {

    // To find out whether the scrollbar is still visible, we

    // check whether the element under the pixel in the bottom

    // right corner of the scrollbar box is the scrollbar box

    // itself (when the bar is still visible) or its filler child

    // (when the bar is hidden). If it is still visible, we keep

    // it enabled, if it's hidden, we disable pointer events.

    var box = bar.getBoundingClientRect()

    var elt = type == "vert" ? document.elementFromPoint(box.right - 1, (box.top + box.bottom) / 2)

        : document.elementFromPoint((box.right + box.left) / 2, box.bottom - 1)

    if (elt != bar) { bar.style.pointerEvents = "none" }

    else { delay.set(1000, maybeDisable) }

  }

  delay.set(1000, maybeDisable)

};



NativeScrollbars.prototype.clear = function () {

  var parent = this.horiz.parentNode

  parent.removeChild(this.horiz)

  parent.removeChild(this.vert)

};



var NullScrollbars = function () {};



NullScrollbars.prototype.update = function () { return {bottom: 0, right: 0} };

NullScrollbars.prototype.setScrollLeft = function () {};

NullScrollbars.prototype.setScrollTop = function () {};

NullScrollbars.prototype.clear = function () {};



function updateScrollbars(cm, measure) {

  if (!measure) { measure = measureForScrollbars(cm) }

  var startWidth = cm.display.barWidth, startHeight = cm.display.barHeight

  updateScrollbarsInner(cm, measure)

  for (var i = 0; i < 4 && startWidth != cm.display.barWidth || startHeight != cm.display.barHeight; i++) {

    if (startWidth != cm.display.barWidth && cm.options.lineWrapping)

      { updateHeightsInViewport(cm) }

    updateScrollbarsInner(cm, measureForScrollbars(cm))

    startWidth = cm.display.barWidth; startHeight = cm.display.barHeight

  }

}



// Re-synchronize the fake scrollbars with the actual size of the

// content.

function updateScrollbarsInner(cm, measure) {

  var d = cm.display

  var sizes = d.scrollbars.update(measure)



  d.sizer.style.paddingRight = (d.barWidth = sizes.right) + "px"

  d.sizer.style.paddingBottom = (d.barHeight = sizes.bottom) + "px"

  d.heightForcer.style.borderBottom = sizes.bottom + "px solid transparent"



  if (sizes.right && sizes.bottom) {

    d.scrollbarFiller.style.display = "block"

    d.scrollbarFiller.style.height = sizes.bottom + "px"

    d.scrollbarFiller.style.width = sizes.right + "px"

  } else { d.scrollbarFiller.style.display = "" }

  if (sizes.bottom && cm.options.coverGutterNextToScrollbar && cm.options.fixedGutter) {

    d.gutterFiller.style.display = "block"

    d.gutterFiller.style.height = sizes.bottom + "px"

    d.gutterFiller.style.width = measure.gutterWidth + "px"

  } else { d.gutterFiller.style.display = "" }

}



var scrollbarModel = {"native": NativeScrollbars, "null": NullScrollbars}



function initScrollbars(cm) {

  if (cm.display.scrollbars) {

    cm.display.scrollbars.clear()

    if (cm.display.scrollbars.addClass)

      { rmClass(cm.display.wrapper, cm.display.scrollbars.addClass) }

  }



  cm.display.scrollbars = new scrollbarModel[cm.options.scrollbarStyle](function (node) {

    cm.display.wrapper.insertBefore(node, cm.display.scrollbarFiller)

    // Prevent clicks in the scrollbars from killing focus

    on(node, "mousedown", function () {

      if (cm.state.focused) { setTimeout(function () { return cm.display.input.focus(); }, 0) }

    })

    node.setAttribute("cm-not-content", "true")

  }, function (pos, axis) {

    if (axis == "horizontal") { setScrollLeft(cm, pos) }

    else { updateScrollTop(cm, pos) }

  }, cm)

  if (cm.display.scrollbars.addClass)

    { addClass(cm.display.wrapper, cm.display.scrollbars.addClass) }

}



// Operations are used to wrap a series of changes to the editor

// state in such a way that each change won't have to update the

// cursor and display (which would be awkward, slow, and

// error-prone). Instead, display updates are batched and then all

// combined and executed at once.



var nextOpId = 0

// Start a new operation.

function startOperation(cm) {

  cm.curOp = {

    cm: cm,

    viewChanged: false,      // Flag that indicates that lines might need to be redrawn

    startHeight: cm.doc.height, // Used to detect need to update scrollbar

    forceUpdate: false,      // Used to force a redraw

    updateInput: null,       // Whether to reset the input textarea

    typing: false,           // Whether this reset should be careful to leave existing text (for compositing)

    changeObjs: null,        // Accumulated changes, for firing change events

    cursorActivityHandlers: null, // Set of handlers to fire cursorActivity on

    cursorActivityCalled: 0, // Tracks which cursorActivity handlers have been called already

    selectionChanged: false, // Whether the selection needs to be redrawn

    updateMaxLine: false,    // Set when the widest line needs to be determined anew

    scrollLeft: null, scrollTop: null, // Intermediate scroll position, not pushed to DOM yet

    scrollToPos: null,       // Used to scroll to a specific position

    focus: false,

    id: ++nextOpId           // Unique ID

  }

  pushOperation(cm.curOp)

}



// Finish an operation, updating the display and signalling delayed events

function endOperation(cm) {

  var op = cm.curOp

  finishOperation(op, function (group) {

    for (var i = 0; i < group.ops.length; i++)

      { group.ops[i].cm.curOp = null }

    endOperations(group)

  })

}



// The DOM updates done when an operation finishes are batched so

// that the minimum number of relayouts are required.

function endOperations(group) {

  var ops = group.ops

  for (var i = 0; i < ops.length; i++) // Read DOM

    { endOperation_R1(ops[i]) }

  for (var i$1 = 0; i$1 < ops.length; i$1++) // Write DOM (maybe)

    { endOperation_W1(ops[i$1]) }

  for (var i$2 = 0; i$2 < ops.length; i$2++) // Read DOM

    { endOperation_R2(ops[i$2]) }

  for (var i$3 = 0; i$3 < ops.length; i$3++) // Write DOM (maybe)

    { endOperation_W2(ops[i$3]) }

  for (var i$4 = 0; i$4 < ops.length; i$4++) // Read DOM

    { endOperation_finish(ops[i$4]) }

}



function endOperation_R1(op) {

  var cm = op.cm, display = cm.display

  maybeClipScrollbars(cm)

  if (op.updateMaxLine) { findMaxLine(cm) }



  op.mustUpdate = op.viewChanged || op.forceUpdate || op.scrollTop != null ||

    op.scrollToPos && (op.scrollToPos.from.line < display.viewFrom ||

                       op.scrollToPos.to.line >= display.viewTo) ||

    display.maxLineChanged && cm.options.lineWrapping

  op.update = op.mustUpdate &&

    new DisplayUpdate(cm, op.mustUpdate && {top: op.scrollTop, ensure: op.scrollToPos}, op.forceUpdate)

}



function endOperation_W1(op) {

  op.updatedDisplay = op.mustUpdate && updateDisplayIfNeeded(op.cm, op.update)

}



function endOperation_R2(op) {

  var cm = op.cm, display = cm.display

  if (op.updatedDisplay) { updateHeightsInViewport(cm) }



  op.barMeasure = measureForScrollbars(cm)



  // If the max line changed since it was last measured, measure it,

  // and ensure the document's width matches it.

  // updateDisplay_W2 will use these properties to do the actual resizing

  if (display.maxLineChanged && !cm.options.lineWrapping) {

    op.adjustWidthTo = measureChar(cm, display.maxLine, display.maxLine.text.length).left + 3

    cm.display.sizerWidth = op.adjustWidthTo

    op.barMeasure.scrollWidth =

      Math.max(display.scroller.clientWidth, display.sizer.offsetLeft + op.adjustWidthTo + scrollGap(cm) + cm.display.barWidth)

    op.maxScrollLeft = Math.max(0, display.sizer.offsetLeft + op.adjustWidthTo - displayWidth(cm))

  }



  if (op.updatedDisplay || op.selectionChanged)

    { op.preparedSelection = display.input.prepareSelection() }

}



function endOperation_W2(op) {

  var cm = op.cm



  if (op.adjustWidthTo != null) {

    cm.display.sizer.style.minWidth = op.adjustWidthTo + "px"

    if (op.maxScrollLeft < cm.doc.scrollLeft)

      { setScrollLeft(cm, Math.min(cm.display.scroller.scrollLeft, op.maxScrollLeft), true) }

    cm.display.maxLineChanged = false

  }



  var takeFocus = op.focus && op.focus == activeElt()

  if (op.preparedSelection)

    { cm.display.input.showSelection(op.preparedSelection, takeFocus) }

  if (op.updatedDisplay || op.startHeight != cm.doc.height)

    { updateScrollbars(cm, op.barMeasure) }

  if (op.updatedDisplay)

    { setDocumentHeight(cm, op.barMeasure) }



  if (op.selectionChanged) { restartBlink(cm) }



  if (cm.state.focused && op.updateInput)

    { cm.display.input.reset(op.typing) }

  if (takeFocus) { ensureFocus(op.cm) }

}



function endOperation_finish(op) {

  var cm = op.cm, display = cm.display, doc = cm.doc



  if (op.updatedDisplay) { postUpdateDisplay(cm, op.update) }



  // Abort mouse wheel delta measurement, when scrolling explicitly

  if (display.wheelStartX != null && (op.scrollTop != null || op.scrollLeft != null || op.scrollToPos))

    { display.wheelStartX = display.wheelStartY = null }



  // Propagate the scroll position to the actual DOM scroller

  if (op.scrollTop != null) { setScrollTop(cm, op.scrollTop, op.forceScroll) }



  if (op.scrollLeft != null) { setScrollLeft(cm, op.scrollLeft, true, true) }

  // If we need to scroll a specific position into view, do so.

  if (op.scrollToPos) {

    var rect = scrollPosIntoView(cm, clipPos(doc, op.scrollToPos.from),

                                 clipPos(doc, op.scrollToPos.to), op.scrollToPos.margin)

    maybeScrollWindow(cm, rect)

  }



  // Fire events for markers that are hidden/unidden by editing or

  // undoing

  var hidden = op.maybeHiddenMarkers, unhidden = op.maybeUnhiddenMarkers

  if (hidden) { for (var i = 0; i < hidden.length; ++i)

    { if (!hidden[i].lines.length) { signal(hidden[i], "hide") } } }

  if (unhidden) { for (var i$1 = 0; i$1 < unhidden.length; ++i$1)

    { if (unhidden[i$1].lines.length) { signal(unhidden[i$1], "unhide") } } }



  if (display.wrapper.offsetHeight)

    { doc.scrollTop = cm.display.scroller.scrollTop }



  // Fire change events, and delayed event handlers

  if (op.changeObjs)

    { signal(cm, "changes", cm, op.changeObjs) }

  if (op.update)

    { op.update.finish() }

}



// Run the given function in an operation

function runInOp(cm, f) {

  if (cm.curOp) { return f() }

  startOperation(cm)

  try { return f() }

  finally { endOperation(cm) }

}

// Wraps a function in an operation. Returns the wrapped function.

function operation(cm, f) {

  return function() {

    if (cm.curOp) { return f.apply(cm, arguments) }

    startOperation(cm)

    try { return f.apply(cm, arguments) }

    finally { endOperation(cm) }

  }

}

// Used to add methods to editor and doc instances, wrapping them in

// operations.

function methodOp(f) {

  return function() {

    if (this.curOp) { return f.apply(this, arguments) }

    startOperation(this)

    try { return f.apply(this, arguments) }

    finally { endOperation(this) }

  }

}

function docMethodOp(f) {

  return function() {

    var cm = this.cm

    if (!cm || cm.curOp) { return f.apply(this, arguments) }

    startOperation(cm)

    try { return f.apply(this, arguments) }

    finally { endOperation(cm) }

  }

}



// Updates the display.view data structure for a given change to the

// document. From and to are in pre-change coordinates. Lendiff is

// the amount of lines added or subtracted by the change. This is

// used for changes that span multiple lines, or change the way

// lines are divided into visual lines. regLineChange (below)

// registers single-line changes.

function regChange(cm, from, to, lendiff) {

  if (from == null) { from = cm.doc.first }

  if (to == null) { to = cm.doc.first + cm.doc.size }

  if (!lendiff) { lendiff = 0 }



  var display = cm.display

  if (lendiff && to < display.viewTo &&

      (display.updateLineNumbers == null || display.updateLineNumbers > from))

    { display.updateLineNumbers = from }



  cm.curOp.viewChanged = true



  if (from >= display.viewTo) { // Change after

    if (sawCollapsedSpans && visualLineNo(cm.doc, from) < display.viewTo)

      { resetView(cm) }

  } else if (to <= display.viewFrom) { // Change before

    if (sawCollapsedSpans && visualLineEndNo(cm.doc, to + lendiff) > display.viewFrom) {

      resetView(cm)

    } else {

      display.viewFrom += lendiff

      display.viewTo += lendiff

    }

  } else if (from <= display.viewFrom && to >= display.viewTo) { // Full overlap

    resetView(cm)

  } else if (from <= display.viewFrom) { // Top overlap

    var cut = viewCuttingPoint(cm, to, to + lendiff, 1)

    if (cut) {

      display.view = display.view.slice(cut.index)

      display.viewFrom = cut.lineN

      display.viewTo += lendiff

    } else {

      resetView(cm)

    }

  } else if (to >= display.viewTo) { // Bottom overlap

    var cut$1 = viewCuttingPoint(cm, from, from, -1)

    if (cut$1) {

      display.view = display.view.slice(0, cut$1.index)

      display.viewTo = cut$1.lineN

    } else {

      resetView(cm)

    }

  } else { // Gap in the middle

    var cutTop = viewCuttingPoint(cm, from, from, -1)

    var cutBot = viewCuttingPoint(cm, to, to + lendiff, 1)

    if (cutTop && cutBot) {

      display.view = display.view.slice(0, cutTop.index)

        .concat(buildViewArray(cm, cutTop.lineN, cutBot.lineN))

        .concat(display.view.slice(cutBot.index))

      display.viewTo += lendiff

    } else {

      resetView(cm)

    }

  }



  var ext = display.externalMeasured

  if (ext) {

    if (to < ext.lineN)

      { ext.lineN += lendiff }

    else if (from < ext.lineN + ext.size)

      { display.externalMeasured = null }

  }

}



// Register a change to a single line. Type must be one of "text",

// "gutter", "class", "widget"

function regLineChange(cm, line, type) {

  cm.curOp.viewChanged = true

  var display = cm.display, ext = cm.display.externalMeasured

  if (ext && line >= ext.lineN && line < ext.lineN + ext.size)

    { display.externalMeasured = null }



  if (line < display.viewFrom || line >= display.viewTo) { return }

  var lineView = display.view[findViewIndex(cm, line)]

  if (lineView.node == null) { return }

  var arr = lineView.changes || (lineView.changes = [])

  if (indexOf(arr, type) == -1) { arr.push(type) }

}



// Clear the view.

function resetView(cm) {

  cm.display.viewFrom = cm.display.viewTo = cm.doc.first

  cm.display.view = []

  cm.display.viewOffset = 0

}



function viewCuttingPoint(cm, oldN, newN, dir) {

  var index = findViewIndex(cm, oldN), diff, view = cm.display.view

  if (!sawCollapsedSpans || newN == cm.doc.first + cm.doc.size)

    { return {index: index, lineN: newN} }

  var n = cm.display.viewFrom

  for (var i = 0; i < index; i++)

    { n += view[i].size }

  if (n != oldN) {

    if (dir > 0) {

      if (index == view.length - 1) { return null }

      diff = (n + view[index].size) - oldN

      index++

    } else {

      diff = n - oldN

    }

    oldN += diff; newN += diff

  }

  while (visualLineNo(cm.doc, newN) != newN) {

    if (index == (dir < 0 ? 0 : view.length - 1)) { return null }

    newN += dir * view[index - (dir < 0 ? 1 : 0)].size

    index += dir

  }

  return {index: index, lineN: newN}

}



// Force the view to cover a given range, adding empty view element

// or clipping off existing ones as needed.

function adjustView(cm, from, to) {

  var display = cm.display, view = display.view

  if (view.length == 0 || from >= display.viewTo || to <= display.viewFrom) {

    display.view = buildViewArray(cm, from, to)

    display.viewFrom = from

  } else {

    if (display.viewFrom > from)

      { display.view = buildViewArray(cm, from, display.viewFrom).concat(display.view) }

    else if (display.viewFrom < from)

      { display.view = display.view.slice(findViewIndex(cm, from)) }

    display.viewFrom = from

    if (display.viewTo < to)

      { display.view = display.view.concat(buildViewArray(cm, display.viewTo, to)) }

    else if (display.viewTo > to)

      { display.view = display.view.slice(0, findViewIndex(cm, to)) }

  }

  display.viewTo = to

}



// Count the number of lines in the view whose DOM representation is

// out of date (or nonexistent).

function countDirtyView(cm) {

  var view = cm.display.view, dirty = 0

  for (var i = 0; i < view.length; i++) {

    var lineView = view[i]

    if (!lineView.hidden && (!lineView.node || lineView.changes)) { ++dirty }

  }

  return dirty

}



// HIGHLIGHT WORKER



function startWorker(cm, time) {

  if (cm.doc.highlightFrontier < cm.display.viewTo)

    { cm.state.highlight.set(time, bind(highlightWorker, cm)) }

}



function highlightWorker(cm) {

  var doc = cm.doc

  if (doc.highlightFrontier >= cm.display.viewTo) { return }

  var end = +new Date + cm.options.workTime

  var context = getContextBefore(cm, doc.highlightFrontier)

  var changedLines = []



  doc.iter(context.line, Math.min(doc.first + doc.size, cm.display.viewTo + 500), function (line) {

    if (context.line >= cm.display.viewFrom) { // Visible

      var oldStyles = line.styles

      var resetState = line.text.length > cm.options.maxHighlightLength ? copyState(doc.mode, context.state) : null

      var highlighted = highlightLine(cm, line, context, true)

      if (resetState) { context.state = resetState }

      line.styles = highlighted.styles

      var oldCls = line.styleClasses, newCls = highlighted.classes

      if (newCls) { line.styleClasses = newCls }

      else if (oldCls) { line.styleClasses = null }

      var ischange = !oldStyles || oldStyles.length != line.styles.length ||

        oldCls != newCls && (!oldCls || !newCls || oldCls.bgClass != newCls.bgClass || oldCls.textClass != newCls.textClass)

      for (var i = 0; !ischange && i < oldStyles.length; ++i) { ischange = oldStyles[i] != line.styles[i] }

      if (ischange) { changedLines.push(context.line) }

      line.stateAfter = context.save()

      context.nextLine()

    } else {

      if (line.text.length <= cm.options.maxHighlightLength)

        { processLine(cm, line.text, context) }

      line.stateAfter = context.line % 5 == 0 ? context.save() : null

      context.nextLine()

    }

    if (+new Date > end) {

      startWorker(cm, cm.options.workDelay)

      return true

    }

  })

  doc.highlightFrontier = context.line

  doc.modeFrontier = Math.max(doc.modeFrontier, context.line)

  if (changedLines.length) { runInOp(cm, function () {

    for (var i = 0; i < changedLines.length; i++)

      { regLineChange(cm, changedLines[i], "text") }

  }) }

}



// DISPLAY DRAWING



var DisplayUpdate = function(cm, viewport, force) {

  var display = cm.display



  this.viewport = viewport

  // Store some values that we'll need later (but don't want to force a relayout for)

  this.visible = visibleLines(display, cm.doc, viewport)

  this.editorIsHidden = !display.wrapper.offsetWidth

  this.wrapperHeight = display.wrapper.clientHeight

  this.wrapperWidth = display.wrapper.clientWidth

  this.oldDisplayWidth = displayWidth(cm)

  this.force = force

  this.dims = getDimensions(cm)

  this.events = []

};



DisplayUpdate.prototype.signal = function (emitter, type) {

  if (hasHandler(emitter, type))

    { this.events.push(arguments) }

};

DisplayUpdate.prototype.finish = function () {

    var this$1 = this;



  for (var i = 0; i < this.events.length; i++)

    { signal.apply(null, this$1.events[i]) }

};



function maybeClipScrollbars(cm) {

  var display = cm.display

  if (!display.scrollbarsClipped && display.scroller.offsetWidth) {

    display.nativeBarWidth = display.scroller.offsetWidth - display.scroller.clientWidth

    display.heightForcer.style.height = scrollGap(cm) + "px"

    display.sizer.style.marginBottom = -display.nativeBarWidth + "px"

    display.sizer.style.borderRightWidth = scrollGap(cm) + "px"

    display.scrollbarsClipped = true

  }

}



function selectionSnapshot(cm) {

  if (cm.hasFocus()) { return null }

  var active = activeElt()

  if (!active || !contains(cm.display.lineDiv, active)) { return null }

  var result = {activeElt: active}

  if (window.getSelection) {

    var sel = window.getSelection()

    if (sel.anchorNode && sel.extend && contains(cm.display.lineDiv, sel.anchorNode)) {

      result.anchorNode = sel.anchorNode

      result.anchorOffset = sel.anchorOffset

      result.focusNode = sel.focusNode

      result.focusOffset = sel.focusOffset

    }

  }

  return result

}



function restoreSelection(snapshot) {

  if (!snapshot || !snapshot.activeElt || snapshot.activeElt == activeElt()) { return }

  snapshot.activeElt.focus()

  if (snapshot.anchorNode && contains(document.body, snapshot.anchorNode) && contains(document.body, snapshot.focusNode)) {

    var sel = window.getSelection(), range = document.createRange()

    range.setEnd(snapshot.anchorNode, snapshot.anchorOffset)

    range.collapse(false)

    sel.removeAllRanges()

    sel.addRange(range)

    sel.extend(snapshot.focusNode, snapshot.focusOffset)

  }

}



// Does the actual updating of the line display. Bails out

// (returning false) when there is nothing to be done and forced is

// false.

function updateDisplayIfNeeded(cm, update) {

  var display = cm.display, doc = cm.doc



  if (update.editorIsHidden) {

    resetView(cm)

    return false

  }



  // Bail out if the visible area is already rendered and nothing changed.

  if (!update.force &&

      update.visible.from >= display.viewFrom && update.visible.to <= display.viewTo &&

      (display.updateLineNumbers == null || display.updateLineNumbers >= display.viewTo) &&

      display.renderedView == display.view && countDirtyView(cm) == 0)

    { return false }



  if (maybeUpdateLineNumberWidth(cm)) {

    resetView(cm)

    update.dims = getDimensions(cm)

  }



  // Compute a suitable new viewport (from & to)

  var end = doc.first + doc.size

  var from = Math.max(update.visible.from - cm.options.viewportMargin, doc.first)

  var to = Math.min(end, update.visible.to + cm.options.viewportMargin)

  if (display.viewFrom < from && from - display.viewFrom < 20) { from = Math.max(doc.first, display.viewFrom) }

  if (display.viewTo > to && display.viewTo - to < 20) { to = Math.min(end, display.viewTo) }

  if (sawCollapsedSpans) {

    from = visualLineNo(cm.doc, from)

    to = visualLineEndNo(cm.doc, to)

  }



  var different = from != display.viewFrom || to != display.viewTo ||

    display.lastWrapHeight != update.wrapperHeight || display.lastWrapWidth != update.wrapperWidth

  adjustView(cm, from, to)



  display.viewOffset = heightAtLine(getLine(cm.doc, display.viewFrom))

  // Position the mover div to align with the current scroll position

  cm.display.mover.style.top = display.viewOffset + "px"



  var toUpdate = countDirtyView(cm)

  if (!different && toUpdate == 0 && !update.force && display.renderedView == display.view &&

      (display.updateLineNumbers == null || display.updateLineNumbers >= display.viewTo))

    { return false }



  // For big changes, we hide the enclosing element during the

  // update, since that speeds up the operations on most browsers.

  var selSnapshot = selectionSnapshot(cm)

  if (toUpdate > 4) { display.lineDiv.style.display = "none" }

  patchDisplay(cm, display.updateLineNumbers, update.dims)

  if (toUpdate > 4) { display.lineDiv.style.display = "" }

  display.renderedView = display.view

  // There might have been a widget with a focused element that got

  // hidden or updated, if so re-focus it.

  restoreSelection(selSnapshot)



  // Prevent selection and cursors from interfering with the scroll

  // width and height.

  removeChildren(display.cursorDiv)

  removeChildren(display.selectionDiv)

  display.gutters.style.height = display.sizer.style.minHeight = 0



  if (different) {

    display.lastWrapHeight = update.wrapperHeight

    display.lastWrapWidth = update.wrapperWidth

    startWorker(cm, 400)

  }



  display.updateLineNumbers = null



  return true

}



function postUpdateDisplay(cm, update) {

  var viewport = update.viewport



  for (var first = true;; first = false) {

    if (!first || !cm.options.lineWrapping || update.oldDisplayWidth == displayWidth(cm)) {

      // Clip forced viewport to actual scrollable area.

      if (viewport && viewport.top != null)

        { viewport = {top: Math.min(cm.doc.height + paddingVert(cm.display) - displayHeight(cm), viewport.top)} }

      // Updated line heights might result in the drawn area not

      // actually covering the viewport. Keep looping until it does.

      update.visible = visibleLines(cm.display, cm.doc, viewport)

      if (update.visible.from >= cm.display.viewFrom && update.visible.to <= cm.display.viewTo)

        { break }

    }

    if (!updateDisplayIfNeeded(cm, update)) { break }

    updateHeightsInViewport(cm)

    var barMeasure = measureForScrollbars(cm)

    updateSelection(cm)

    updateScrollbars(cm, barMeasure)

    setDocumentHeight(cm, barMeasure)

    update.force = false

  }



  update.signal(cm, "update", cm)

  if (cm.display.viewFrom != cm.display.reportedViewFrom || cm.display.viewTo != cm.display.reportedViewTo) {

    update.signal(cm, "viewportChange", cm, cm.display.viewFrom, cm.display.viewTo)

    cm.display.reportedViewFrom = cm.display.viewFrom; cm.display.reportedViewTo = cm.display.viewTo

  }

}



function updateDisplaySimple(cm, viewport) {

  var update = new DisplayUpdate(cm, viewport)

  if (updateDisplayIfNeeded(cm, update)) {

    updateHeightsInViewport(cm)

    postUpdateDisplay(cm, update)

    var barMeasure = measureForScrollbars(cm)

    updateSelection(cm)

    updateScrollbars(cm, barMeasure)

    setDocumentHeight(cm, barMeasure)

    update.finish()

  }

}



// Sync the actual display DOM structure with display.view, removing

// nodes for lines that are no longer in view, and creating the ones

// that are not there yet, and updating the ones that are out of

// date.

function patchDisplay(cm, updateNumbersFrom, dims) {

  var display = cm.display, lineNumbers = cm.options.lineNumbers

  var container = display.lineDiv, cur = container.firstChild



  function rm(node) {

    var next = node.nextSibling

    // Works around a throw-scroll bug in OS X Webkit

    if (webkit && mac && cm.display.currentWheelTarget == node)

      { node.style.display = "none" }

    else

      { node.parentNode.removeChild(node) }

    return next

  }



  var view = display.view, lineN = display.viewFrom

  // Loop over the elements in the view, syncing cur (the DOM nodes

  // in display.lineDiv) with the view as we go.

  for (var i = 0; i < view.length; i++) {

    var lineView = view[i]

    if (lineView.hidden) {

    } else if (!lineView.node || lineView.node.parentNode != container) { // Not drawn yet

      var node = buildLineElement(cm, lineView, lineN, dims)

      container.insertBefore(node, cur)

    } else { // Already drawn

      while (cur != lineView.node) { cur = rm(cur) }

      var updateNumber = lineNumbers && updateNumbersFrom != null &&

        updateNumbersFrom <= lineN && lineView.lineNumber

      if (lineView.changes) {

        if (indexOf(lineView.changes, "gutter") > -1) { updateNumber = false }

        updateLineForChanges(cm, lineView, lineN, dims)

      }

      if (updateNumber) {

        removeChildren(lineView.lineNumber)

        lineView.lineNumber.appendChild(document.createTextNode(lineNumberFor(cm.options, lineN)))

      }

      cur = lineView.node.nextSibling

    }

    lineN += lineView.size

  }

  while (cur) { cur = rm(cur) }

}



function updateGutterSpace(cm) {

  var width = cm.display.gutters.offsetWidth

  cm.display.sizer.style.marginLeft = width + "px"

}



function setDocumentHeight(cm, measure) {

  cm.display.sizer.style.minHeight = measure.docHeight + "px"

  cm.display.heightForcer.style.top = measure.docHeight + "px"

  cm.display.gutters.style.height = (measure.docHeight + cm.display.barHeight + scrollGap(cm)) + "px"

}



// Rebuild the gutter elements, ensure the margin to the left of the

// code matches their width.

function updateGutters(cm) {

  var gutters = cm.display.gutters, specs = cm.options.gutters

  removeChildren(gutters)

  var i = 0

  for (; i < specs.length; ++i) {

    var gutterClass = specs[i]

    var gElt = gutters.appendChild(elt("div", null, "CodeMirror-gutter " + gutterClass))

    if (gutterClass == "CodeMirror-linenumbers") {

      cm.display.lineGutter = gElt

      gElt.style.width = (cm.display.lineNumWidth || 1) + "px"

    }

  }

  gutters.style.display = i ? "" : "none"

  updateGutterSpace(cm)

}



// Make sure the gutters options contains the element

// "CodeMirror-linenumbers" when the lineNumbers option is true.

function setGuttersForLineNumbers(options) {

  var found = indexOf(options.gutters, "CodeMirror-linenumbers")

  if (found == -1 && options.lineNumbers) {

    options.gutters = options.gutters.concat(["CodeMirror-linenumbers"])

  } else if (found > -1 && !options.lineNumbers) {

    options.gutters = options.gutters.slice(0)

    options.gutters.splice(found, 1)

  }

}



var wheelSamples = 0;

var wheelPixelsPerUnit = null;

// Fill in a browser-detected starting value on browsers where we

// know one. These don't have to be accurate -- the result of them

// being wrong would just be a slight flicker on the first wheel

// scroll (if it is large enough).

if (ie) { wheelPixelsPerUnit = -.53 }

else if (gecko) { wheelPixelsPerUnit = 15 }

else if (chrome) { wheelPixelsPerUnit = -.7 }

else if (safari) { wheelPixelsPerUnit = -1/3 }



function wheelEventDelta(e) {

  var dx = e.wheelDeltaX, dy = e.wheelDeltaY

  if (dx == null && e.detail && e.axis == e.HORIZONTAL_AXIS) { dx = e.detail }

  if (dy == null && e.detail && e.axis == e.VERTICAL_AXIS) { dy = e.detail }

  else if (dy == null) { dy = e.wheelDelta }

  return {x: dx, y: dy}

}

function wheelEventPixels(e) {

  var delta = wheelEventDelta(e)

  delta.x *= wheelPixelsPerUnit

  delta.y *= wheelPixelsPerUnit

  return delta

}



function onScrollWheel(cm, e) {

  var delta = wheelEventDelta(e), dx = delta.x, dy = delta.y



  var display = cm.display, scroll = display.scroller

  // Quit if there's nothing to scroll here

  var canScrollX = scroll.scrollWidth > scroll.clientWidth

  var canScrollY = scroll.scrollHeight > scroll.clientHeight

  if (!(dx && canScrollX || dy && canScrollY)) { return }



  // Webkit browsers on OS X abort momentum scrolls when the target

  // of the scroll event is removed from the scrollable element.

  // This hack (see related code in patchDisplay) makes sure the

  // element is kept around.

  if (dy && mac && webkit) {

    outer: for (var cur = e.target, view = display.view; cur != scroll; cur = cur.parentNode) {

      for (var i = 0; i < view.length; i++) {

        if (view[i].node == cur) {

          cm.display.currentWheelTarget = cur

          break outer

        }

      }

    }

  }



  // On some browsers, horizontal scrolling will cause redraws to

  // happen before the gutter has been realigned, causing it to

  // wriggle around in a most unseemly way. When we have an

  // estimated pixels/delta value, we just handle horizontal

  // scrolling entirely here. It'll be slightly off from native, but

  // better than glitching out.

  if (dx && !gecko && !presto && wheelPixelsPerUnit != null) {

    if (dy && canScrollY)

      { updateScrollTop(cm, Math.max(0, scroll.scrollTop + dy * wheelPixelsPerUnit)) }

    setScrollLeft(cm, Math.max(0, scroll.scrollLeft + dx * wheelPixelsPerUnit))

    // Only prevent default scrolling if vertical scrolling is

    // actually possible. Otherwise, it causes vertical scroll

    // jitter on OSX trackpads when deltaX is small and deltaY

    // is large (issue #3579)

    if (!dy || (dy && canScrollY))

      { e_preventDefault(e) }

    display.wheelStartX = null // Abort measurement, if in progress

    return

  }



  // 'Project' the visible viewport to cover the area that is being

  // scrolled into view (if we know enough to estimate it).

  if (dy && wheelPixelsPerUnit != null) {

    var pixels = dy * wheelPixelsPerUnit

    var top = cm.doc.scrollTop, bot = top + display.wrapper.clientHeight

    if (pixels < 0) { top = Math.max(0, top + pixels - 50) }

    else { bot = Math.min(cm.doc.height, bot + pixels + 50) }

    updateDisplaySimple(cm, {top: top, bottom: bot})

  }



  if (wheelSamples < 20) {

    if (display.wheelStartX == null) {

      display.wheelStartX = scroll.scrollLeft; display.wheelStartY = scroll.scrollTop

      display.wheelDX = dx; display.wheelDY = dy

      setTimeout(function () {

        if (display.wheelStartX == null) { return }

        var movedX = scroll.scrollLeft - display.wheelStartX

        var movedY = scroll.scrollTop - display.wheelStartY

        var sample = (movedY && display.wheelDY && movedY / display.wheelDY) ||

          (movedX && display.wheelDX && movedX / display.wheelDX)

        display.wheelStartX = display.wheelStartY = null

        if (!sample) { return }

        wheelPixelsPerUnit = (wheelPixelsPerUnit * wheelSamples + sample) / (wheelSamples + 1)

        ++wheelSamples

      }, 200)

    } else {

      display.wheelDX += dx; display.wheelDY += dy

    }

  }

}



// Selection objects are immutable. A new one is created every time

// the selection changes. A selection is one or more non-overlapping

// (and non-touching) ranges, sorted, and an integer that indicates

// which one is the primary selection (the one that's scrolled into

// view, that getCursor returns, etc).

var Selection = function(ranges, primIndex) {

  this.ranges = ranges

  this.primIndex = primIndex

};



Selection.prototype.primary = function () { return this.ranges[this.primIndex] };



Selection.prototype.equals = function (other) {

    var this$1 = this;



  if (other == this) { return true }

  if (other.primIndex != this.primIndex || other.ranges.length != this.ranges.length) { return false }

  for (var i = 0; i < this.ranges.length; i++) {

    var here = this$1.ranges[i], there = other.ranges[i]

    if (!equalCursorPos(here.anchor, there.anchor) || !equalCursorPos(here.head, there.head)) { return false }

  }

  return true

};



Selection.prototype.deepCopy = function () {

    var this$1 = this;



  var out = []

  for (var i = 0; i < this.ranges.length; i++)

    { out[i] = new Range(copyPos(this$1.ranges[i].anchor), copyPos(this$1.ranges[i].head)) }

  return new Selection(out, this.primIndex)

};



Selection.prototype.somethingSelected = function () {

    var this$1 = this;



  for (var i = 0; i < this.ranges.length; i++)

    { if (!this$1.ranges[i].empty()) { return true } }

  return false

};



Selection.prototype.contains = function (pos, end) {

    var this$1 = this;



  if (!end) { end = pos }

  for (var i = 0; i < this.ranges.length; i++) {

    var range = this$1.ranges[i]

    if (cmp(end, range.from()) >= 0 && cmp(pos, range.to()) <= 0)

      { return i }

  }

  return -1

};



var Range = function(anchor, head) {

  this.anchor = anchor; this.head = head

};



Range.prototype.from = function () { return minPos(this.anchor, this.head) };

Range.prototype.to = function () { return maxPos(this.anchor, this.head) };

Range.prototype.empty = function () { return this.head.line == this.anchor.line && this.head.ch == this.anchor.ch };



// Take an unsorted, potentially overlapping set of ranges, and

// build a selection out of it. 'Consumes' ranges array (modifying

// it).

function normalizeSelection(ranges, primIndex) {

  var prim = ranges[primIndex]

  ranges.sort(function (a, b) { return cmp(a.from(), b.from()); })

  primIndex = indexOf(ranges, prim)

  for (var i = 1; i < ranges.length; i++) {

    var cur = ranges[i], prev = ranges[i - 1]

    if (cmp(prev.to(), cur.from()) >= 0) {

      var from = minPos(prev.from(), cur.from()), to = maxPos(prev.to(), cur.to())

      var inv = prev.empty() ? cur.from() == cur.head : prev.from() == prev.head

      if (i <= primIndex) { --primIndex }

      ranges.splice(--i, 2, new Range(inv ? to : from, inv ? from : to))

    }

  }

  return new Selection(ranges, primIndex)

}



function simpleSelection(anchor, head) {

  return new Selection([new Range(anchor, head || anchor)], 0)

}



// Compute the position of the end of a change (its 'to' property

// refers to the pre-change end).

function changeEnd(change) {

  if (!change.text) { return change.to }

  return Pos(change.from.line + change.text.length - 1,

             lst(change.text).length + (change.text.length == 1 ? change.from.ch : 0))

}



// Adjust a position to refer to the post-change position of the

// same text, or the end of the change if the change covers it.

function adjustForChange(pos, change) {

  if (cmp(pos, change.from) < 0) { return pos }

  if (cmp(pos, change.to) <= 0) { return changeEnd(change) }



  var line = pos.line + change.text.length - (change.to.line - change.from.line) - 1, ch = pos.ch

  if (pos.line == change.to.line) { ch += changeEnd(change).ch - change.to.ch }

  return Pos(line, ch)

}



function computeSelAfterChange(doc, change) {

  var out = []

  for (var i = 0; i < doc.sel.ranges.length; i++) {

    var range = doc.sel.ranges[i]

    out.push(new Range(adjustForChange(range.anchor, change),

                       adjustForChange(range.head, change)))

  }

  return normalizeSelection(out, doc.sel.primIndex)

}



function offsetPos(pos, old, nw) {

  if (pos.line == old.line)

    { return Pos(nw.line, pos.ch - old.ch + nw.ch) }

  else

    { return Pos(nw.line + (pos.line - old.line), pos.ch) }

}



// Used by replaceSelections to allow moving the selection to the

// start or around the replaced test. Hint may be "start" or "around".

function computeReplacedSel(doc, changes, hint) {

  var out = []

  var oldPrev = Pos(doc.first, 0), newPrev = oldPrev

  for (var i = 0; i < changes.length; i++) {

    var change = changes[i]

    var from = offsetPos(change.from, oldPrev, newPrev)

    var to = offsetPos(changeEnd(change), oldPrev, newPrev)

    oldPrev = change.to

    newPrev = to

    if (hint == "around") {

      var range = doc.sel.ranges[i], inv = cmp(range.head, range.anchor) < 0

      out[i] = new Range(inv ? to : from, inv ? from : to)

    } else {

      out[i] = new Range(from, from)

    }

  }

  return new Selection(out, doc.sel.primIndex)

}



// Used to get the editor into a consistent state again when options change.



function loadMode(cm) {

  cm.doc.mode = getMode(cm.options, cm.doc.modeOption)

  resetModeState(cm)

}



function resetModeState(cm) {

  cm.doc.iter(function (line) {

    if (line.stateAfter) { line.stateAfter = null }

    if (line.styles) { line.styles = null }

  })

  cm.doc.modeFrontier = cm.doc.highlightFrontier = cm.doc.first

  startWorker(cm, 100)

  cm.state.modeGen++

  if (cm.curOp) { regChange(cm) }

}



// DOCUMENT DATA STRUCTURE



// By default, updates that start and end at the beginning of a line

// are treated specially, in order to make the association of line

// widgets and marker elements with the text behave more intuitive.

function isWholeLineUpdate(doc, change) {

  return change.from.ch == 0 && change.to.ch == 0 && lst(change.text) == "" &&

    (!doc.cm || doc.cm.options.wholeLineUpdateBefore)

}



// Perform a change on the document data structure.

function updateDoc(doc, change, markedSpans, estimateHeight) {

  function spansFor(n) {return markedSpans ? markedSpans[n] : null}

  function update(line, text, spans) {

    updateLine(line, text, spans, estimateHeight)

    signalLater(line, "change", line, change)

  }

  function linesFor(start, end) {

    var result = []

    for (var i = start; i < end; ++i)

      { result.push(new Line(text[i], spansFor(i), estimateHeight)) }

    return result

  }



  var from = change.from, to = change.to, text = change.text

  var firstLine = getLine(doc, from.line), lastLine = getLine(doc, to.line)

  var lastText = lst(text), lastSpans = spansFor(text.length - 1), nlines = to.line - from.line



  // Adjust the line structure

  if (change.full) {

    doc.insert(0, linesFor(0, text.length))

    doc.remove(text.length, doc.size - text.length)

  } else if (isWholeLineUpdate(doc, change)) {

    // This is a whole-line replace. Treated specially to make

    // sure line objects move the way they are supposed to.

    var added = linesFor(0, text.length - 1)

    update(lastLine, lastLine.text, lastSpans)

    if (nlines) { doc.remove(from.line, nlines) }

    if (added.length) { doc.insert(from.line, added) }

  } else if (firstLine == lastLine) {

    if (text.length == 1) {

      update(firstLine, firstLine.text.slice(0, from.ch) + lastText + firstLine.text.slice(to.ch), lastSpans)

    } else {

      var added$1 = linesFor(1, text.length - 1)

      added$1.push(new Line(lastText + firstLine.text.slice(to.ch), lastSpans, estimateHeight))

      update(firstLine, firstLine.text.slice(0, from.ch) + text[0], spansFor(0))

      doc.insert(from.line + 1, added$1)

    }

  } else if (text.length == 1) {

    update(firstLine, firstLine.text.slice(0, from.ch) + text[0] + lastLine.text.slice(to.ch), spansFor(0))

    doc.remove(from.line + 1, nlines)

  } else {

    update(firstLine, firstLine.text.slice(0, from.ch) + text[0], spansFor(0))

    update(lastLine, lastText + lastLine.text.slice(to.ch), lastSpans)

    var added$2 = linesFor(1, text.length - 1)

    if (nlines > 1) { doc.remove(from.line + 1, nlines - 1) }

    doc.insert(from.line + 1, added$2)

  }



  signalLater(doc, "change", doc, change)

}



// Call f for all linked documents.

function linkedDocs(doc, f, sharedHistOnly) {

  function propagate(doc, skip, sharedHist) {

    if (doc.linked) { for (var i = 0; i < doc.linked.length; ++i) {

      var rel = doc.linked[i]

      if (rel.doc == skip) { continue }

      var shared = sharedHist && rel.sharedHist

      if (sharedHistOnly && !shared) { continue }

      f(rel.doc, shared)

      propagate(rel.doc, doc, shared)

    } }

  }

  propagate(doc, null, true)

}



// Attach a document to an editor.

function attachDoc(cm, doc) {

  if (doc.cm) { throw new Error("This document is already in use.") }

  cm.doc = doc

  doc.cm = cm

  estimateLineHeights(cm)

  loadMode(cm)

  setDirectionClass(cm)

  if (!cm.options.lineWrapping) { findMaxLine(cm) }

  cm.options.mode = doc.modeOption

  regChange(cm)

}



function setDirectionClass(cm) {

  ;(cm.doc.direction == "rtl" ? addClass : rmClass)(cm.display.lineDiv, "CodeMirror-rtl")

}



function directionChanged(cm) {

  runInOp(cm, function () {

    setDirectionClass(cm)

    regChange(cm)

  })

}



function History(startGen) {

  // Arrays of change events and selections. Doing something adds an

  // event to done and clears undo. Undoing moves events from done

  // to undone, redoing moves them in the other direction.

  this.done = []; this.undone = []

  this.undoDepth = Infinity

  // Used to track when changes can be merged into a single undo

  // event

  this.lastModTime = this.lastSelTime = 0

  this.lastOp = this.lastSelOp = null

  this.lastOrigin = this.lastSelOrigin = null

  // Used by the isClean() method

  this.generation = this.maxGeneration = startGen || 1

}



// Create a history change event from an updateDoc-style change

// object.

function historyChangeFromChange(doc, change) {

  var histChange = {from: copyPos(change.from), to: changeEnd(change), text: getBetween(doc, change.from, change.to)}

  attachLocalSpans(doc, histChange, change.from.line, change.to.line + 1)

  linkedDocs(doc, function (doc) { return attachLocalSpans(doc, histChange, change.from.line, change.to.line + 1); }, true)

  return histChange

}



// Pop all selection events off the end of a history array. Stop at

// a change event.

function clearSelectionEvents(array) {

  while (array.length) {

    var last = lst(array)

    if (last.ranges) { array.pop() }

    else { break }

  }

}



// Find the top change event in the history. Pop off selection

// events that are in the way.

function lastChangeEvent(hist, force) {

  if (force) {

    clearSelectionEvents(hist.done)

    return lst(hist.done)

  } else if (hist.done.length && !lst(hist.done).ranges) {

    return lst(hist.done)

  } else if (hist.done.length > 1 && !hist.done[hist.done.length - 2].ranges) {

    hist.done.pop()

    return lst(hist.done)

  }

}



// Register a change in the history. Merges changes that are within

// a single operation, or are close together with an origin that

// allows merging (starting with "+") into a single event.

function addChangeToHistory(doc, change, selAfter, opId) {

  var hist = doc.history

  hist.undone.length = 0

  var time = +new Date, cur

  var last



  if ((hist.lastOp == opId ||

       hist.lastOrigin == change.origin && change.origin &&

       ((change.origin.charAt(0) == "+" && doc.cm && hist.lastModTime > time - doc.cm.options.historyEventDelay) ||

        change.origin.charAt(0) == "*")) &&

      (cur = lastChangeEvent(hist, hist.lastOp == opId))) {

    // Merge this change into the last event

    last = lst(cur.changes)

    if (cmp(change.from, change.to) == 0 && cmp(change.from, last.to) == 0) {

      // Optimized case for simple insertion -- don't want to add

      // new changesets for every character typed

      last.to = changeEnd(change)

    } else {

      // Add new sub-event

      cur.changes.push(historyChangeFromChange(doc, change))

    }

  } else {

    // Can not be merged, start a new event.

    var before = lst(hist.done)

    if (!before || !before.ranges)

      { pushSelectionToHistory(doc.sel, hist.done) }

    cur = {changes: [historyChangeFromChange(doc, change)],

           generation: hist.generation}

    hist.done.push(cur)

    while (hist.done.length > hist.undoDepth) {

      hist.done.shift()

      if (!hist.done[0].ranges) { hist.done.shift() }

    }

  }

  hist.done.push(selAfter)

  hist.generation = ++hist.maxGeneration

  hist.lastModTime = hist.lastSelTime = time

  hist.lastOp = hist.lastSelOp = opId

  hist.lastOrigin = hist.lastSelOrigin = change.origin



  if (!last) { signal(doc, "historyAdded") }

}



function selectionEventCanBeMerged(doc, origin, prev, sel) {

  var ch = origin.charAt(0)

  return ch == "*" ||

    ch == "+" &&

    prev.ranges.length == sel.ranges.length &&

    prev.somethingSelected() == sel.somethingSelected() &&

    new Date - doc.history.lastSelTime <= (doc.cm ? doc.cm.options.historyEventDelay : 500)

}



// Called whenever the selection changes, sets the new selection as

// the pending selection in the history, and pushes the old pending

// selection into the 'done' array when it was significantly

// different (in number of selected ranges, emptiness, or time).

function addSelectionToHistory(doc, sel, opId, options) {

  var hist = doc.history, origin = options && options.origin



  // A new event is started when the previous origin does not match

  // the current, or the origins don't allow matching. Origins

  // starting with * are always merged, those starting with + are

  // merged when similar and close together in time.

  if (opId == hist.lastSelOp ||

      (origin && hist.lastSelOrigin == origin &&

       (hist.lastModTime == hist.lastSelTime && hist.lastOrigin == origin ||

        selectionEventCanBeMerged(doc, origin, lst(hist.done), sel))))

    { hist.done[hist.done.length - 1] = sel }

  else

    { pushSelectionToHistory(sel, hist.done) }



  hist.lastSelTime = +new Date

  hist.lastSelOrigin = origin

  hist.lastSelOp = opId

  if (options && options.clearRedo !== false)

    { clearSelectionEvents(hist.undone) }

}



function pushSelectionToHistory(sel, dest) {

  var top = lst(dest)

  if (!(top && top.ranges && top.equals(sel)))

    { dest.push(sel) }

}



// Used to store marked span information in the history.

function attachLocalSpans(doc, change, from, to) {

  var existing = change["spans_" + doc.id], n = 0

  doc.iter(Math.max(doc.first, from), Math.min(doc.first + doc.size, to), function (line) {

    if (line.markedSpans)

      { (existing || (existing = change["spans_" + doc.id] = {}))[n] = line.markedSpans }

    ++n

  })

}



// When un/re-doing restores text containing marked spans, those

// that have been explicitly cleared should not be restored.

function removeClearedSpans(spans) {

  if (!spans) { return null }

  var out

  for (var i = 0; i < spans.length; ++i) {

    if (spans[i].marker.explicitlyCleared) { if (!out) { out = spans.slice(0, i) } }

    else if (out) { out.push(spans[i]) }

  }

  return !out ? spans : out.length ? out : null

}



// Retrieve and filter the old marked spans stored in a change event.

function getOldSpans(doc, change) {

  var found = change["spans_" + doc.id]

  if (!found) { return null }

  var nw = []

  for (var i = 0; i < change.text.length; ++i)

    { nw.push(removeClearedSpans(found[i])) }

  return nw

}



// Used for un/re-doing changes from the history. Combines the

// result of computing the existing spans with the set of spans that

// existed in the history (so that deleting around a span and then

// undoing brings back the span).

function mergeOldSpans(doc, change) {

  var old = getOldSpans(doc, change)

  var stretched = stretchSpansOverChange(doc, change)

  if (!old) { return stretched }

  if (!stretched) { return old }



  for (var i = 0; i < old.length; ++i) {

    var oldCur = old[i], stretchCur = stretched[i]

    if (oldCur && stretchCur) {

      spans: for (var j = 0; j < stretchCur.length; ++j) {

        var span = stretchCur[j]

        for (var k = 0; k < oldCur.length; ++k)

          { if (oldCur[k].marker == span.marker) { continue spans } }

        oldCur.push(span)

      }

    } else if (stretchCur) {

      old[i] = stretchCur

    }

  }

  return old

}



// Used both to provide a JSON-safe object in .getHistory, and, when

// detaching a document, to split the history in two

function copyHistoryArray(events, newGroup, instantiateSel) {

  var copy = []

  for (var i = 0; i < events.length; ++i) {

    var event = events[i]

    if (event.ranges) {

      copy.push(instantiateSel ? Selection.prototype.deepCopy.call(event) : event)

      continue

    }

    var changes = event.changes, newChanges = []

    copy.push({changes: newChanges})

    for (var j = 0; j < changes.length; ++j) {

      var change = changes[j], m = (void 0)

      newChanges.push({from: change.from, to: change.to, text: change.text})

      if (newGroup) { for (var prop in change) { if (m = prop.match(/^spans_(\d+)$/)) {

        if (indexOf(newGroup, Number(m[1])) > -1) {

          lst(newChanges)[prop] = change[prop]

          delete change[prop]

        }

      } } }

    }

  }

  return copy

}



// The 'scroll' parameter given to many of these indicated whether

// the new cursor position should be scrolled into view after

// modifying the selection.



// If shift is held or the extend flag is set, extends a range to

// include a given position (and optionally a second position).

// Otherwise, simply returns the range between the given positions.

// Used for cursor motion and such.

function extendRange(range, head, other, extend) {

  if (extend) {

    var anchor = range.anchor

    if (other) {

      var posBefore = cmp(head, anchor) < 0

      if (posBefore != (cmp(other, anchor) < 0)) {

        anchor = head

        head = other

      } else if (posBefore != (cmp(head, other) < 0)) {

        head = other

      }

    }

    return new Range(anchor, head)

  } else {

    return new Range(other || head, head)

  }

}



// Extend the primary selection range, discard the rest.

function extendSelection(doc, head, other, options, extend) {

  if (extend == null) { extend = doc.cm && (doc.cm.display.shift || doc.extend) }

  setSelection(doc, new Selection([extendRange(doc.sel.primary(), head, other, extend)], 0), options)

}



// Extend all selections (pos is an array of selections with length

// equal the number of selections)

function extendSelections(doc, heads, options) {

  var out = []

  var extend = doc.cm && (doc.cm.display.shift || doc.extend)

  for (var i = 0; i < doc.sel.ranges.length; i++)

    { out[i] = extendRange(doc.sel.ranges[i], heads[i], null, extend) }

  var newSel = normalizeSelection(out, doc.sel.primIndex)

  setSelection(doc, newSel, options)

}



// Updates a single range in the selection.

function replaceOneSelection(doc, i, range, options) {

  var ranges = doc.sel.ranges.slice(0)

  ranges[i] = range

  setSelection(doc, normalizeSelection(ranges, doc.sel.primIndex), options)

}



// Reset the selection to a single range.

function setSimpleSelection(doc, anchor, head, options) {

  setSelection(doc, simpleSelection(anchor, head), options)

}



// Give beforeSelectionChange handlers a change to influence a

// selection update.

function filterSelectionChange(doc, sel, options) {

  var obj = {

    ranges: sel.ranges,

    update: function(ranges) {

      var this$1 = this;



      this.ranges = []

      for (var i = 0; i < ranges.length; i++)

        { this$1.ranges[i] = new Range(clipPos(doc, ranges[i].anchor),

                                   clipPos(doc, ranges[i].head)) }

    },

    origin: options && options.origin

  }

  signal(doc, "beforeSelectionChange", doc, obj)

  if (doc.cm) { signal(doc.cm, "beforeSelectionChange", doc.cm, obj) }

  if (obj.ranges != sel.ranges) { return normalizeSelection(obj.ranges, obj.ranges.length - 1) }

  else { return sel }

}



function setSelectionReplaceHistory(doc, sel, options) {

  var done = doc.history.done, last = lst(done)

  if (last && last.ranges) {

    done[done.length - 1] = sel

    setSelectionNoUndo(doc, sel, options)

  } else {

    setSelection(doc, sel, options)

  }

}



// Set a new selection.

function setSelection(doc, sel, options) {

  setSelectionNoUndo(doc, sel, options)

  addSelectionToHistory(doc, doc.sel, doc.cm ? doc.cm.curOp.id : NaN, options)

}



function setSelectionNoUndo(doc, sel, options) {

  if (hasHandler(doc, "beforeSelectionChange") || doc.cm && hasHandler(doc.cm, "beforeSelectionChange"))

    { sel = filterSelectionChange(doc, sel, options) }



  var bias = options && options.bias ||

    (cmp(sel.primary().head, doc.sel.primary().head) < 0 ? -1 : 1)

  setSelectionInner(doc, skipAtomicInSelection(doc, sel, bias, true))



  if (!(options && options.scroll === false) && doc.cm)

    { ensureCursorVisible(doc.cm) }

}



function setSelectionInner(doc, sel) {

  if (sel.equals(doc.sel)) { return }



  doc.sel = sel



  if (doc.cm) {

    doc.cm.curOp.updateInput = doc.cm.curOp.selectionChanged = true

    signalCursorActivity(doc.cm)

  }

  signalLater(doc, "cursorActivity", doc)

}



// Verify that the selection does not partially select any atomic

// marked ranges.

function reCheckSelection(doc) {

  setSelectionInner(doc, skipAtomicInSelection(doc, doc.sel, null, false))

}



// Return a selection that does not partially select any atomic

// ranges.

function skipAtomicInSelection(doc, sel, bias, mayClear) {

  var out

  for (var i = 0; i < sel.ranges.length; i++) {

    var range = sel.ranges[i]

    var old = sel.ranges.length == doc.sel.ranges.length && doc.sel.ranges[i]

    var newAnchor = skipAtomic(doc, range.anchor, old && old.anchor, bias, mayClear)

    var newHead = skipAtomic(doc, range.head, old && old.head, bias, mayClear)

    if (out || newAnchor != range.anchor || newHead != range.head) {

      if (!out) { out = sel.ranges.slice(0, i) }

      out[i] = new Range(newAnchor, newHead)

    }

  }

  return out ? normalizeSelection(out, sel.primIndex) : sel

}



function skipAtomicInner(doc, pos, oldPos, dir, mayClear) {

  var line = getLine(doc, pos.line)

  if (line.markedSpans) { for (var i = 0; i < line.markedSpans.length; ++i) {

    var sp = line.markedSpans[i], m = sp.marker

    if ((sp.from == null || (m.inclusiveLeft ? sp.from <= pos.ch : sp.from < pos.ch)) &&

        (sp.to == null || (m.inclusiveRight ? sp.to >= pos.ch : sp.to > pos.ch))) {

      if (mayClear) {

        signal(m, "beforeCursorEnter")

        if (m.explicitlyCleared) {

          if (!line.markedSpans) { break }

          else {--i; continue}

        }

      }

      if (!m.atomic) { continue }



      if (oldPos) {

        var near = m.find(dir < 0 ? 1 : -1), diff = (void 0)

        if (dir < 0 ? m.inclusiveRight : m.inclusiveLeft)

          { near = movePos(doc, near, -dir, near && near.line == pos.line ? line : null) }

        if (near && near.line == pos.line && (diff = cmp(near, oldPos)) && (dir < 0 ? diff < 0 : diff > 0))

          { return skipAtomicInner(doc, near, pos, dir, mayClear) }

      }



      var far = m.find(dir < 0 ? -1 : 1)

      if (dir < 0 ? m.inclusiveLeft : m.inclusiveRight)

        { far = movePos(doc, far, dir, far.line == pos.line ? line : null) }

      return far ? skipAtomicInner(doc, far, pos, dir, mayClear) : null

    }

  } }

  return pos

}



// Ensure a given position is not inside an atomic range.

function skipAtomic(doc, pos, oldPos, bias, mayClear) {

  var dir = bias || 1

  var found = skipAtomicInner(doc, pos, oldPos, dir, mayClear) ||

      (!mayClear && skipAtomicInner(doc, pos, oldPos, dir, true)) ||

      skipAtomicInner(doc, pos, oldPos, -dir, mayClear) ||

      (!mayClear && skipAtomicInner(doc, pos, oldPos, -dir, true))

  if (!found) {

    doc.cantEdit = true

    return Pos(doc.first, 0)

  }

  return found

}



function movePos(doc, pos, dir, line) {

  if (dir < 0 && pos.ch == 0) {

    if (pos.line > doc.first) { return clipPos(doc, Pos(pos.line - 1)) }

    else { return null }

  } else if (dir > 0 && pos.ch == (line || getLine(doc, pos.line)).text.length) {

    if (pos.line < doc.first + doc.size - 1) { return Pos(pos.line + 1, 0) }

    else { return null }

  } else {

    return new Pos(pos.line, pos.ch + dir)

  }

}



function selectAll(cm) {

  cm.setSelection(Pos(cm.firstLine(), 0), Pos(cm.lastLine()), sel_dontScroll)

}



// UPDATING



// Allow "beforeChange" event handlers to influence a change

function filterChange(doc, change, update) {

  var obj = {

    canceled: false,

    from: change.from,

    to: change.to,

    text: change.text,

    origin: change.origin,

    cancel: function () { return obj.canceled = true; }

  }

  if (update) { obj.update = function (from, to, text, origin) {

    if (from) { obj.from = clipPos(doc, from) }

    if (to) { obj.to = clipPos(doc, to) }

    if (text) { obj.text = text }

    if (origin !== undefined) { obj.origin = origin }

  } }

  signal(doc, "beforeChange", doc, obj)

  if (doc.cm) { signal(doc.cm, "beforeChange", doc.cm, obj) }



  if (obj.canceled) { return null }

  return {from: obj.from, to: obj.to, text: obj.text, origin: obj.origin}

}



// Apply a change to a document, and add it to the document's

// history, and propagating it to all linked documents.

function makeChange(doc, change, ignoreReadOnly) {

  if (doc.cm) {

    if (!doc.cm.curOp) { return operation(doc.cm, makeChange)(doc, change, ignoreReadOnly) }

    if (doc.cm.state.suppressEdits) { return }

  }



  if (hasHandler(doc, "beforeChange") || doc.cm && hasHandler(doc.cm, "beforeChange")) {

    change = filterChange(doc, change, true)

    if (!change) { return }

  }



  // Possibly split or suppress the update based on the presence

  // of read-only spans in its range.

  var split = sawReadOnlySpans && !ignoreReadOnly && removeReadOnlyRanges(doc, change.from, change.to)

  if (split) {

    for (var i = split.length - 1; i >= 0; --i)

      { makeChangeInner(doc, {from: split[i].from, to: split[i].to, text: i ? [""] : change.text, origin: change.origin}) }

  } else {

    makeChangeInner(doc, change)

  }

}



function makeChangeInner(doc, change) {

  if (change.text.length == 1 && change.text[0] == "" && cmp(change.from, change.to) == 0) { return }

  var selAfter = computeSelAfterChange(doc, change)

  addChangeToHistory(doc, change, selAfter, doc.cm ? doc.cm.curOp.id : NaN)



  makeChangeSingleDoc(doc, change, selAfter, stretchSpansOverChange(doc, change))

  var rebased = []



  linkedDocs(doc, function (doc, sharedHist) {

    if (!sharedHist && indexOf(rebased, doc.history) == -1) {

      rebaseHist(doc.history, change)

      rebased.push(doc.history)

    }

    makeChangeSingleDoc(doc, change, null, stretchSpansOverChange(doc, change))

  })

}



// Revert a change stored in a document's history.

function makeChangeFromHistory(doc, type, allowSelectionOnly) {

  if (doc.cm && doc.cm.state.suppressEdits && !allowSelectionOnly) { return }



  var hist = doc.history, event, selAfter = doc.sel

  var source = type == "undo" ? hist.done : hist.undone, dest = type == "undo" ? hist.undone : hist.done



  // Verify that there is a useable event (so that ctrl-z won't

  // needlessly clear selection events)

  var i = 0

  for (; i < source.length; i++) {

    event = source[i]

    if (allowSelectionOnly ? event.ranges && !event.equals(doc.sel) : !event.ranges)

      { break }

  }

  if (i == source.length) { return }

  hist.lastOrigin = hist.lastSelOrigin = null



  for (;;) {

    event = source.pop()

    if (event.ranges) {

      pushSelectionToHistory(event, dest)

      if (allowSelectionOnly && !event.equals(doc.sel)) {

        setSelection(doc, event, {clearRedo: false})

        return

      }

      selAfter = event

    }

    else { break }

  }



  // Build up a reverse change object to add to the opposite history

  // stack (redo when undoing, and vice versa).

  var antiChanges = []

  pushSelectionToHistory(selAfter, dest)

  dest.push({changes: antiChanges, generation: hist.generation})

  hist.generation = event.generation || ++hist.maxGeneration



  var filter = hasHandler(doc, "beforeChange") || doc.cm && hasHandler(doc.cm, "beforeChange")



  var loop = function ( i ) {

    var change = event.changes[i]

    change.origin = type

    if (filter && !filterChange(doc, change, false)) {

      source.length = 0

      return {}

    }



    antiChanges.push(historyChangeFromChange(doc, change))



    var after = i ? computeSelAfterChange(doc, change) : lst(source)

    makeChangeSingleDoc(doc, change, after, mergeOldSpans(doc, change))

    if (!i && doc.cm) { doc.cm.scrollIntoView({from: change.from, to: changeEnd(change)}) }

    var rebased = []



    // Propagate to the linked documents

    linkedDocs(doc, function (doc, sharedHist) {

      if (!sharedHist && indexOf(rebased, doc.history) == -1) {

        rebaseHist(doc.history, change)

        rebased.push(doc.history)

      }

      makeChangeSingleDoc(doc, change, null, mergeOldSpans(doc, change))

    })

  };



  for (var i$1 = event.changes.length - 1; i$1 >= 0; --i$1) {

    var returned = loop( i$1 );



    if ( returned ) return returned.v;

  }

}



// Sub-views need their line numbers shifted when text is added

// above or below them in the parent document.

function shiftDoc(doc, distance) {

  if (distance == 0) { return }

  doc.first += distance

  doc.sel = new Selection(map(doc.sel.ranges, function (range) { return new Range(

    Pos(range.anchor.line + distance, range.anchor.ch),

    Pos(range.head.line + distance, range.head.ch)

  ); }), doc.sel.primIndex)

  if (doc.cm) {

    regChange(doc.cm, doc.first, doc.first - distance, distance)

    for (var d = doc.cm.display, l = d.viewFrom; l < d.viewTo; l++)

      { regLineChange(doc.cm, l, "gutter") }

  }

}



// More lower-level change function, handling only a single document

// (not linked ones).

function makeChangeSingleDoc(doc, change, selAfter, spans) {

  if (doc.cm && !doc.cm.curOp)

    { return operation(doc.cm, makeChangeSingleDoc)(doc, change, selAfter, spans) }



  if (change.to.line < doc.first) {

    shiftDoc(doc, change.text.length - 1 - (change.to.line - change.from.line))

    return

  }

  if (change.from.line > doc.lastLine()) { return }



  // Clip the change to the size of this doc

  if (change.from.line < doc.first) {

    var shift = change.text.length - 1 - (doc.first - change.from.line)

    shiftDoc(doc, shift)

    change = {from: Pos(doc.first, 0), to: Pos(change.to.line + shift, change.to.ch),

              text: [lst(change.text)], origin: change.origin}

  }

  var last = doc.lastLine()

  if (change.to.line > last) {

    change = {from: change.from, to: Pos(last, getLine(doc, last).text.length),

              text: [change.text[0]], origin: change.origin}

  }



  change.removed = getBetween(doc, change.from, change.to)



  if (!selAfter) { selAfter = computeSelAfterChange(doc, change) }

  if (doc.cm) { makeChangeSingleDocInEditor(doc.cm, change, spans) }

  else { updateDoc(doc, change, spans) }

  setSelectionNoUndo(doc, selAfter, sel_dontScroll)

}



// Handle the interaction of a change to a document with the editor

// that this document is part of.

function makeChangeSingleDocInEditor(cm, change, spans) {

  var doc = cm.doc, display = cm.display, from = change.from, to = change.to



  var recomputeMaxLength = false, checkWidthStart = from.line

  if (!cm.options.lineWrapping) {

    checkWidthStart = lineNo(visualLine(getLine(doc, from.line)))

    doc.iter(checkWidthStart, to.line + 1, function (line) {

      if (line == display.maxLine) {

        recomputeMaxLength = true

        return true

      }

    })

  }



  if (doc.sel.contains(change.from, change.to) > -1)

    { signalCursorActivity(cm) }



  updateDoc(doc, change, spans, estimateHeight(cm))



  if (!cm.options.lineWrapping) {

    doc.iter(checkWidthStart, from.line + change.text.length, function (line) {

      var len = lineLength(line)

      if (len > display.maxLineLength) {

        display.maxLine = line

        display.maxLineLength = len

        display.maxLineChanged = true

        recomputeMaxLength = false

      }

    })

    if (recomputeMaxLength) { cm.curOp.updateMaxLine = true }

  }



  retreatFrontier(doc, from.line)

  startWorker(cm, 400)



  var lendiff = change.text.length - (to.line - from.line) - 1

  // Remember that these lines changed, for updating the display

  if (change.full)

    { regChange(cm) }

  else if (from.line == to.line && change.text.length == 1 && !isWholeLineUpdate(cm.doc, change))

    { regLineChange(cm, from.line, "text") }

  else

    { regChange(cm, from.line, to.line + 1, lendiff) }



  var changesHandler = hasHandler(cm, "changes"), changeHandler = hasHandler(cm, "change")

  if (changeHandler || changesHandler) {

    var obj = {

      from: from, to: to,

      text: change.text,

      removed: change.removed,

      origin: change.origin

    }

    if (changeHandler) { signalLater(cm, "change", cm, obj) }

    if (changesHandler) { (cm.curOp.changeObjs || (cm.curOp.changeObjs = [])).push(obj) }

  }

  cm.display.selForContextMenu = null

}



function replaceRange(doc, code, from, to, origin) {

  if (!to) { to = from }

  if (cmp(to, from) < 0) { var assign;

    (assign = [to, from], from = assign[0], to = assign[1], assign) }

  if (typeof code == "string") { code = doc.splitLines(code) }

  makeChange(doc, {from: from, to: to, text: code, origin: origin})

}



// Rebasing/resetting history to deal with externally-sourced changes



function rebaseHistSelSingle(pos, from, to, diff) {

  if (to < pos.line) {

    pos.line += diff

  } else if (from < pos.line) {

    pos.line = from

    pos.ch = 0

  }

}



// Tries to rebase an array of history events given a change in the

// document. If the change touches the same lines as the event, the

// event, and everything 'behind' it, is discarded. If the change is

// before the event, the event's positions are updated. Uses a

// copy-on-write scheme for the positions, to avoid having to

// reallocate them all on every rebase, but also avoid problems with

// shared position objects being unsafely updated.

function rebaseHistArray(array, from, to, diff) {

  for (var i = 0; i < array.length; ++i) {

    var sub = array[i], ok = true

    if (sub.ranges) {

      if (!sub.copied) { sub = array[i] = sub.deepCopy(); sub.copied = true }

      for (var j = 0; j < sub.ranges.length; j++) {

        rebaseHistSelSingle(sub.ranges[j].anchor, from, to, diff)

        rebaseHistSelSingle(sub.ranges[j].head, from, to, diff)

      }

      continue

    }

    for (var j$1 = 0; j$1 < sub.changes.length; ++j$1) {

      var cur = sub.changes[j$1]

      if (to < cur.from.line) {

        cur.from = Pos(cur.from.line + diff, cur.from.ch)

        cur.to = Pos(cur.to.line + diff, cur.to.ch)

      } else if (from <= cur.to.line) {

        ok = false

        break

      }

    }

    if (!ok) {

      array.splice(0, i + 1)

      i = 0

    }

  }

}



function rebaseHist(hist, change) {

  var from = change.from.line, to = change.to.line, diff = change.text.length - (to - from) - 1

  rebaseHistArray(hist.done, from, to, diff)

  rebaseHistArray(hist.undone, from, to, diff)

}



// Utility for applying a change to a line by handle or number,

// returning the number and optionally registering the line as

// changed.

function changeLine(doc, handle, changeType, op) {

  var no = handle, line = handle

  if (typeof handle == "number") { line = getLine(doc, clipLine(doc, handle)) }

  else { no = lineNo(handle) }

  if (no == null) { return null }

  if (op(line, no) && doc.cm) { regLineChange(doc.cm, no, changeType) }

  return line

}



// The document is represented as a BTree consisting of leaves, with

// chunk of lines in them, and branches, with up to ten leaves or

// other branch nodes below them. The top node is always a branch

// node, and is the document object itself (meaning it has

// additional methods and properties).

//

// All nodes have parent links. The tree is used both to go from

// line numbers to line objects, and to go from objects to numbers.

// It also indexes by height, and is used to convert between height

// and line object, and to find the total height of the document.

//

// See also http://marijnhaverbeke.nl/blog/codemirror-line-tree.html



function LeafChunk(lines) {

  var this$1 = this;



  this.lines = lines

  this.parent = null

  var height = 0

  for (var i = 0; i < lines.length; ++i) {

    lines[i].parent = this$1

    height += lines[i].height

  }

  this.height = height

}



LeafChunk.prototype = {

  chunkSize: function chunkSize() { return this.lines.length },



  // Remove the n lines at offset 'at'.

  removeInner: function removeInner(at, n) {

    var this$1 = this;



    for (var i = at, e = at + n; i < e; ++i) {

      var line = this$1.lines[i]

      this$1.height -= line.height

      cleanUpLine(line)

      signalLater(line, "delete")

    }

    this.lines.splice(at, n)

  },



  // Helper used to collapse a small branch into a single leaf.

  collapse: function collapse(lines) {

    lines.push.apply(lines, this.lines)

  },



  // Insert the given array of lines at offset 'at', count them as

  // having the given height.

  insertInner: function insertInner(at, lines, height) {

    var this$1 = this;



    this.height += height

    this.lines = this.lines.slice(0, at).concat(lines).concat(this.lines.slice(at))

    for (var i = 0; i < lines.length; ++i) { lines[i].parent = this$1 }

  },



  // Used to iterate over a part of the tree.

  iterN: function iterN(at, n, op) {

    var this$1 = this;



    for (var e = at + n; at < e; ++at)

      { if (op(this$1.lines[at])) { return true } }

  }

}



function BranchChunk(children) {

  var this$1 = this;



  this.children = children

  var size = 0, height = 0

  for (var i = 0; i < children.length; ++i) {

    var ch = children[i]

    size += ch.chunkSize(); height += ch.height

    ch.parent = this$1

  }

  this.size = size

  this.height = height

  this.parent = null

}



BranchChunk.prototype = {

  chunkSize: function chunkSize() { return this.size },



  removeInner: function removeInner(at, n) {

    var this$1 = this;



    this.size -= n

    for (var i = 0; i < this.children.length; ++i) {

      var child = this$1.children[i], sz = child.chunkSize()

      if (at < sz) {

        var rm = Math.min(n, sz - at), oldHeight = child.height

        child.removeInner(at, rm)

        this$1.height -= oldHeight - child.height

        if (sz == rm) { this$1.children.splice(i--, 1); child.parent = null }

        if ((n -= rm) == 0) { break }

        at = 0

      } else { at -= sz }

    }

    // If the result is smaller than 25 lines, ensure that it is a

    // single leaf node.

    if (this.size - n < 25 &&

        (this.children.length > 1 || !(this.children[0] instanceof LeafChunk))) {

      var lines = []

      this.collapse(lines)

      this.children = [new LeafChunk(lines)]

      this.children[0].parent = this

    }

  },



  collapse: function collapse(lines) {

    var this$1 = this;



    for (var i = 0; i < this.children.length; ++i) { this$1.children[i].collapse(lines) }

  },



  insertInner: function insertInner(at, lines, height) {

    var this$1 = this;



    this.size += lines.length

    this.height += height

    for (var i = 0; i < this.children.length; ++i) {

      var child = this$1.children[i], sz = child.chunkSize()

      if (at <= sz) {

        child.insertInner(at, lines, height)

        if (child.lines && child.lines.length > 50) {

          // To avoid memory thrashing when child.lines is huge (e.g. first view of a large file), it's never spliced.

          // Instead, small slices are taken. They're taken in order because sequential memory accesses are fastest.

          var remaining = child.lines.length % 25 + 25

          for (var pos = remaining; pos < child.lines.length;) {

            var leaf = new LeafChunk(child.lines.slice(pos, pos += 25))

            child.height -= leaf.height

            this$1.children.splice(++i, 0, leaf)

            leaf.parent = this$1

          }

          child.lines = child.lines.slice(0, remaining)

          this$1.maybeSpill()

        }

        break

      }

      at -= sz

    }

  },



  // When a node has grown, check whether it should be split.

  maybeSpill: function maybeSpill() {

    if (this.children.length <= 10) { return }

    var me = this

    do {

      var spilled = me.children.splice(me.children.length - 5, 5)

      var sibling = new BranchChunk(spilled)

      if (!me.parent) { // Become the parent node

        var copy = new BranchChunk(me.children)

        copy.parent = me

        me.children = [copy, sibling]

        me = copy

     } else {

        me.size -= sibling.size

        me.height -= sibling.height

        var myIndex = indexOf(me.parent.children, me)

        me.parent.children.splice(myIndex + 1, 0, sibling)

      }

      sibling.parent = me.parent

    } while (me.children.length > 10)

    me.parent.maybeSpill()

  },



  iterN: function iterN(at, n, op) {

    var this$1 = this;



    for (var i = 0; i < this.children.length; ++i) {

      var child = this$1.children[i], sz = child.chunkSize()

      if (at < sz) {

        var used = Math.min(n, sz - at)

        if (child.iterN(at, used, op)) { return true }

        if ((n -= used) == 0) { break }

        at = 0

      } else { at -= sz }

    }

  }

}



// Line widgets are block elements displayed above or below a line.



var LineWidget = function(doc, node, options) {

  var this$1 = this;



  if (options) { for (var opt in options) { if (options.hasOwnProperty(opt))

    { this$1[opt] = options[opt] } } }

  this.doc = doc

  this.node = node

};



LineWidget.prototype.clear = function () {

    var this$1 = this;



  var cm = this.doc.cm, ws = this.line.widgets, line = this.line, no = lineNo(line)

  if (no == null || !ws) { return }

  for (var i = 0; i < ws.length; ++i) { if (ws[i] == this$1) { ws.splice(i--, 1) } }

  if (!ws.length) { line.widgets = null }

  var height = widgetHeight(this)

  updateLineHeight(line, Math.max(0, line.height - height))

  if (cm) {

    runInOp(cm, function () {

      adjustScrollWhenAboveVisible(cm, line, -height)

      regLineChange(cm, no, "widget")

    })

    signalLater(cm, "lineWidgetCleared", cm, this, no)

  }

};



LineWidget.prototype.changed = function () {

    var this$1 = this;



  var oldH = this.height, cm = this.doc.cm, line = this.line

  this.height = null

  var diff = widgetHeight(this) - oldH

  if (!diff) { return }

  updateLineHeight(line, line.height + diff)

  if (cm) {

    runInOp(cm, function () {

      cm.curOp.forceUpdate = true

      adjustScrollWhenAboveVisible(cm, line, diff)

      signalLater(cm, "lineWidgetChanged", cm, this$1, lineNo(line))

    })

  }

};

eventMixin(LineWidget)



function adjustScrollWhenAboveVisible(cm, line, diff) {

  if (heightAtLine(line) < ((cm.curOp && cm.curOp.scrollTop) || cm.doc.scrollTop))

    { addToScrollTop(cm, diff) }

}



function addLineWidget(doc, handle, node, options) {

  var widget = new LineWidget(doc, node, options)

  var cm = doc.cm

  if (cm && widget.noHScroll) { cm.display.alignWidgets = true }

  changeLine(doc, handle, "widget", function (line) {

    var widgets = line.widgets || (line.widgets = [])

    if (widget.insertAt == null) { widgets.push(widget) }

    else { widgets.splice(Math.min(widgets.length - 1, Math.max(0, widget.insertAt)), 0, widget) }

    widget.line = line

    if (cm && !lineIsHidden(doc, line)) {

      var aboveVisible = heightAtLine(line) < doc.scrollTop

      updateLineHeight(line, line.height + widgetHeight(widget))

      if (aboveVisible) { addToScrollTop(cm, widget.height) }

      cm.curOp.forceUpdate = true

    }

    return true

  })

  signalLater(cm, "lineWidgetAdded", cm, widget, typeof handle == "number" ? handle : lineNo(handle))

  return widget

}



// TEXTMARKERS



// Created with markText and setBookmark methods. A TextMarker is a

// handle that can be used to clear or find a marked position in the

// document. Line objects hold arrays (markedSpans) containing

// {from, to, marker} object pointing to such marker objects, and

// indicating that such a marker is present on that line. Multiple

// lines may point to the same marker when it spans across lines.

// The spans will have null for their from/to properties when the

// marker continues beyond the start/end of the line. Markers have

// links back to the lines they currently touch.



// Collapsed markers have unique ids, in order to be able to order

// them, which is needed for uniquely determining an outer marker

// when they overlap (they may nest, but not partially overlap).

var nextMarkerId = 0



var TextMarker = function(doc, type) {

  this.lines = []

  this.type = type

  this.doc = doc

  this.id = ++nextMarkerId

};



// Clear the marker.

TextMarker.prototype.clear = function () {

    var this$1 = this;



  if (this.explicitlyCleared) { return }

  var cm = this.doc.cm, withOp = cm && !cm.curOp

  if (withOp) { startOperation(cm) }

  if (hasHandler(this, "clear")) {

    var found = this.find()

    if (found) { signalLater(this, "clear", found.from, found.to) }

  }

  var min = null, max = null

  for (var i = 0; i < this.lines.length; ++i) {

    var line = this$1.lines[i]

    var span = getMarkedSpanFor(line.markedSpans, this$1)

    if (cm && !this$1.collapsed) { regLineChange(cm, lineNo(line), "text") }

    else if (cm) {

      if (span.to != null) { max = lineNo(line) }

      if (span.from != null) { min = lineNo(line) }

    }

    line.markedSpans = removeMarkedSpan(line.markedSpans, span)

    if (span.from == null && this$1.collapsed && !lineIsHidden(this$1.doc, line) && cm)

      { updateLineHeight(line, textHeight(cm.display)) }

  }

  if (cm && this.collapsed && !cm.options.lineWrapping) { for (var i$1 = 0; i$1 < this.lines.length; ++i$1) {

    var visual = visualLine(this$1.lines[i$1]), len = lineLength(visual)

    if (len > cm.display.maxLineLength) {

      cm.display.maxLine = visual

      cm.display.maxLineLength = len

      cm.display.maxLineChanged = true

    }

  } }



  if (min != null && cm && this.collapsed) { regChange(cm, min, max + 1) }

  this.lines.length = 0

  this.explicitlyCleared = true

  if (this.atomic && this.doc.cantEdit) {

    this.doc.cantEdit = false

    if (cm) { reCheckSelection(cm.doc) }

  }

  if (cm) { signalLater(cm, "markerCleared", cm, this, min, max) }

  if (withOp) { endOperation(cm) }

  if (this.parent) { this.parent.clear() }

};



// Find the position of the marker in the document. Returns a {from,

// to} object by default. Side can be passed to get a specific side

// -- 0 (both), -1 (left), or 1 (right). When lineObj is true, the

// Pos objects returned contain a line object, rather than a line

// number (used to prevent looking up the same line twice).

TextMarker.prototype.find = function (side, lineObj) {

    var this$1 = this;



  if (side == null && this.type == "bookmark") { side = 1 }

  var from, to

  for (var i = 0; i < this.lines.length; ++i) {

    var line = this$1.lines[i]

    var span = getMarkedSpanFor(line.markedSpans, this$1)

    if (span.from != null) {

      from = Pos(lineObj ? line : lineNo(line), span.from)

      if (side == -1) { return from }

    }

    if (span.to != null) {

      to = Pos(lineObj ? line : lineNo(line), span.to)

      if (side == 1) { return to }

    }

  }

  return from && {from: from, to: to}

};



// Signals that the marker's widget changed, and surrounding layout

// should be recomputed.

TextMarker.prototype.changed = function () {

    var this$1 = this;



  var pos = this.find(-1, true), widget = this, cm = this.doc.cm

  if (!pos || !cm) { return }

  runInOp(cm, function () {

    var line = pos.line, lineN = lineNo(pos.line)

    var view = findViewForLine(cm, lineN)

    if (view) {

      clearLineMeasurementCacheFor(view)

      cm.curOp.selectionChanged = cm.curOp.forceUpdate = true

    }

    cm.curOp.updateMaxLine = true

    if (!lineIsHidden(widget.doc, line) && widget.height != null) {

      var oldHeight = widget.height

      widget.height = null

      var dHeight = widgetHeight(widget) - oldHeight

      if (dHeight)

        { updateLineHeight(line, line.height + dHeight) }

    }

    signalLater(cm, "markerChanged", cm, this$1)

  })

};



TextMarker.prototype.attachLine = function (line) {

  if (!this.lines.length && this.doc.cm) {

    var op = this.doc.cm.curOp

    if (!op.maybeHiddenMarkers || indexOf(op.maybeHiddenMarkers, this) == -1)

      { (op.maybeUnhiddenMarkers || (op.maybeUnhiddenMarkers = [])).push(this) }

  }

  this.lines.push(line)

};



TextMarker.prototype.detachLine = function (line) {

  this.lines.splice(indexOf(this.lines, line), 1)

  if (!this.lines.length && this.doc.cm) {

    var op = this.doc.cm.curOp

    ;(op.maybeHiddenMarkers || (op.maybeHiddenMarkers = [])).push(this)

  }

};

eventMixin(TextMarker)



// Create a marker, wire it up to the right lines, and

function markText(doc, from, to, options, type) {

  // Shared markers (across linked documents) are handled separately

  // (markTextShared will call out to this again, once per

  // document).

  if (options && options.shared) { return markTextShared(doc, from, to, options, type) }

  // Ensure we are in an operation.

  if (doc.cm && !doc.cm.curOp) { return operation(doc.cm, markText)(doc, from, to, options, type) }



  var marker = new TextMarker(doc, type), diff = cmp(from, to)

  if (options) { copyObj(options, marker, false) }

  // Don't connect empty markers unless clearWhenEmpty is false

  if (diff > 0 || diff == 0 && marker.clearWhenEmpty !== false)

    { return marker }

  if (marker.replacedWith) {

    // Showing up as a widget implies collapsed (widget replaces text)

    marker.collapsed = true

    marker.widgetNode = eltP("span", [marker.replacedWith], "CodeMirror-widget")

    if (!options.handleMouseEvents) { marker.widgetNode.setAttribute("cm-ignore-events", "true") }

    if (options.insertLeft) { marker.widgetNode.insertLeft = true }

  }

  if (marker.collapsed) {

    if (conflictingCollapsedRange(doc, from.line, from, to, marker) ||

        from.line != to.line && conflictingCollapsedRange(doc, to.line, from, to, marker))

      { throw new Error("Inserting collapsed marker partially overlapping an existing one") }

    seeCollapsedSpans()

  }



  if (marker.addToHistory)

    { addChangeToHistory(doc, {from: from, to: to, origin: "markText"}, doc.sel, NaN) }



  var curLine = from.line, cm = doc.cm, updateMaxLine

  doc.iter(curLine, to.line + 1, function (line) {

    if (cm && marker.collapsed && !cm.options.lineWrapping && visualLine(line) == cm.display.maxLine)

      { updateMaxLine = true }

    if (marker.collapsed && curLine != from.line) { updateLineHeight(line, 0) }

    addMarkedSpan(line, new MarkedSpan(marker,

                                       curLine == from.line ? from.ch : null,

                                       curLine == to.line ? to.ch : null))

    ++curLine

  })

  // lineIsHidden depends on the presence of the spans, so needs a second pass

  if (marker.collapsed) { doc.iter(from.line, to.line + 1, function (line) {

    if (lineIsHidden(doc, line)) { updateLineHeight(line, 0) }

  }) }



  if (marker.clearOnEnter) { on(marker, "beforeCursorEnter", function () { return marker.clear(); }) }



  if (marker.readOnly) {

    seeReadOnlySpans()

    if (doc.history.done.length || doc.history.undone.length)

      { doc.clearHistory() }

  }

  if (marker.collapsed) {

    marker.id = ++nextMarkerId

    marker.atomic = true

  }

  if (cm) {

    // Sync editor state

    if (updateMaxLine) { cm.curOp.updateMaxLine = true }

    if (marker.collapsed)

      { regChange(cm, from.line, to.line + 1) }

    else if (marker.className || marker.title || marker.startStyle || marker.endStyle || marker.css)

      { for (var i = from.line; i <= to.line; i++) { regLineChange(cm, i, "text") } }

    if (marker.atomic) { reCheckSelection(cm.doc) }

    signalLater(cm, "markerAdded", cm, marker)

  }

  return marker

}



// SHARED TEXTMARKERS



// A shared marker spans multiple linked documents. It is

// implemented as a meta-marker-object controlling multiple normal

// markers.

var SharedTextMarker = function(markers, primary) {

  var this$1 = this;



  this.markers = markers

  this.primary = primary

  for (var i = 0; i < markers.length; ++i)

    { markers[i].parent = this$1 }

};



SharedTextMarker.prototype.clear = function () {

    var this$1 = this;



  if (this.explicitlyCleared) { return }

  this.explicitlyCleared = true

  for (var i = 0; i < this.markers.length; ++i)

    { this$1.markers[i].clear() }

  signalLater(this, "clear")

};



SharedTextMarker.prototype.find = function (side, lineObj) {

  return this.primary.find(side, lineObj)

};

eventMixin(SharedTextMarker)



function markTextShared(doc, from, to, options, type) {

  options = copyObj(options)

  options.shared = false

  var markers = [markText(doc, from, to, options, type)], primary = markers[0]

  var widget = options.widgetNode

  linkedDocs(doc, function (doc) {

    if (widget) { options.widgetNode = widget.cloneNode(true) }

    markers.push(markText(doc, clipPos(doc, from), clipPos(doc, to), options, type))

    for (var i = 0; i < doc.linked.length; ++i)

      { if (doc.linked[i].isParent) { return } }

    primary = lst(markers)

  })

  return new SharedTextMarker(markers, primary)

}



function findSharedMarkers(doc) {

  return doc.findMarks(Pos(doc.first, 0), doc.clipPos(Pos(doc.lastLine())), function (m) { return m.parent; })

}



function copySharedMarkers(doc, markers) {

  for (var i = 0; i < markers.length; i++) {

    var marker = markers[i], pos = marker.find()

    var mFrom = doc.clipPos(pos.from), mTo = doc.clipPos(pos.to)

    if (cmp(mFrom, mTo)) {

      var subMark = markText(doc, mFrom, mTo, marker.primary, marker.primary.type)

      marker.markers.push(subMark)

      subMark.parent = marker

    }

  }

}



function detachSharedMarkers(markers) {

  var loop = function ( i ) {

    var marker = markers[i], linked = [marker.primary.doc]

    linkedDocs(marker.primary.doc, function (d) { return linked.push(d); })

    for (var j = 0; j < marker.markers.length; j++) {

      var subMarker = marker.markers[j]

      if (indexOf(linked, subMarker.doc) == -1) {

        subMarker.parent = null

        marker.markers.splice(j--, 1)

      }

    }

  };



  for (var i = 0; i < markers.length; i++) loop( i );

}



var nextDocId = 0

var Doc = function(text, mode, firstLine, lineSep, direction) {

  if (!(this instanceof Doc)) { return new Doc(text, mode, firstLine, lineSep, direction) }

  if (firstLine == null) { firstLine = 0 }



  BranchChunk.call(this, [new LeafChunk([new Line("", null)])])

  this.first = firstLine

  this.scrollTop = this.scrollLeft = 0

  this.cantEdit = false

  this.cleanGeneration = 1

  this.modeFrontier = this.highlightFrontier = firstLine

  var start = Pos(firstLine, 0)

  this.sel = simpleSelection(start)

  this.history = new History(null)

  this.id = ++nextDocId

  this.modeOption = mode

  this.lineSep = lineSep

  this.direction = (direction == "rtl") ? "rtl" : "ltr"

  this.extend = false



  if (typeof text == "string") { text = this.splitLines(text) }

  updateDoc(this, {from: start, to: start, text: text})

  setSelection(this, simpleSelection(start), sel_dontScroll)

}



Doc.prototype = createObj(BranchChunk.prototype, {

  constructor: Doc,

  // Iterate over the document. Supports two forms -- with only one

  // argument, it calls that for each line in the document. With

  // three, it iterates over the range given by the first two (with

  // the second being non-inclusive).

  iter: function(from, to, op) {

    if (op) { this.iterN(from - this.first, to - from, op) }

    else { this.iterN(this.first, this.first + this.size, from) }

  },



  // Non-public interface for adding and removing lines.

  insert: function(at, lines) {

    var height = 0

    for (var i = 0; i < lines.length; ++i) { height += lines[i].height }

    this.insertInner(at - this.first, lines, height)

  },

  remove: function(at, n) { this.removeInner(at - this.first, n) },



  // From here, the methods are part of the public interface. Most

  // are also available from CodeMirror (editor) instances.



  getValue: function(lineSep) {

    var lines = getLines(this, this.first, this.first + this.size)

    if (lineSep === false) { return lines }

    return lines.join(lineSep || this.lineSeparator())

  },

  setValue: docMethodOp(function(code) {

    var top = Pos(this.first, 0), last = this.first + this.size - 1

    makeChange(this, {from: top, to: Pos(last, getLine(this, last).text.length),

                      text: this.splitLines(code), origin: "setValue", full: true}, true)

    if (this.cm) { scrollToCoords(this.cm, 0, 0) }

    setSelection(this, simpleSelection(top), sel_dontScroll)

  }),

  replaceRange: function(code, from, to, origin) {

    from = clipPos(this, from)

    to = to ? clipPos(this, to) : from

    replaceRange(this, code, from, to, origin)

  },

  getRange: function(from, to, lineSep) {

    var lines = getBetween(this, clipPos(this, from), clipPos(this, to))

    if (lineSep === false) { return lines }

    return lines.join(lineSep || this.lineSeparator())

  },



  getLine: function(line) {var l = this.getLineHandle(line); return l && l.text},



  getLineHandle: function(line) {if (isLine(this, line)) { return getLine(this, line) }},

  getLineNumber: function(line) {return lineNo(line)},



  getLineHandleVisualStart: function(line) {

    if (typeof line == "number") { line = getLine(this, line) }

    return visualLine(line)

  },



  lineCount: function() {return this.size},

  firstLine: function() {return this.first},

  lastLine: function() {return this.first + this.size - 1},



  clipPos: function(pos) {return clipPos(this, pos)},



  getCursor: function(start) {

    var range = this.sel.primary(), pos

    if (start == null || start == "head") { pos = range.head }

    else if (start == "anchor") { pos = range.anchor }

    else if (start == "end" || start == "to" || start === false) { pos = range.to() }

    else { pos = range.from() }

    return pos

  },

  listSelections: function() { return this.sel.ranges },

  somethingSelected: function() {return this.sel.somethingSelected()},



  setCursor: docMethodOp(function(line, ch, options) {

    setSimpleSelection(this, clipPos(this, typeof line == "number" ? Pos(line, ch || 0) : line), null, options)

  }),

  setSelection: docMethodOp(function(anchor, head, options) {

    setSimpleSelection(this, clipPos(this, anchor), clipPos(this, head || anchor), options)

  }),

  extendSelection: docMethodOp(function(head, other, options) {

    extendSelection(this, clipPos(this, head), other && clipPos(this, other), options)

  }),

  extendSelections: docMethodOp(function(heads, options) {

    extendSelections(this, clipPosArray(this, heads), options)

  }),

  extendSelectionsBy: docMethodOp(function(f, options) {

    var heads = map(this.sel.ranges, f)

    extendSelections(this, clipPosArray(this, heads), options)

  }),

  setSelections: docMethodOp(function(ranges, primary, options) {

    var this$1 = this;



    if (!ranges.length) { return }

    var out = []

    for (var i = 0; i < ranges.length; i++)

      { out[i] = new Range(clipPos(this$1, ranges[i].anchor),

                         clipPos(this$1, ranges[i].head)) }

    if (primary == null) { primary = Math.min(ranges.length - 1, this.sel.primIndex) }

    setSelection(this, normalizeSelection(out, primary), options)

  }),

  addSelection: docMethodOp(function(anchor, head, options) {

    var ranges = this.sel.ranges.slice(0)

    ranges.push(new Range(clipPos(this, anchor), clipPos(this, head || anchor)))

    setSelection(this, normalizeSelection(ranges, ranges.length - 1), options)

  }),



  getSelection: function(lineSep) {

    var this$1 = this;



    var ranges = this.sel.ranges, lines

    for (var i = 0; i < ranges.length; i++) {

      var sel = getBetween(this$1, ranges[i].from(), ranges[i].to())

      lines = lines ? lines.concat(sel) : sel

    }

    if (lineSep === false) { return lines }

    else { return lines.join(lineSep || this.lineSeparator()) }

  },

  getSelections: function(lineSep) {

    var this$1 = this;



    var parts = [], ranges = this.sel.ranges

    for (var i = 0; i < ranges.length; i++) {

      var sel = getBetween(this$1, ranges[i].from(), ranges[i].to())

      if (lineSep !== false) { sel = sel.join(lineSep || this$1.lineSeparator()) }

      parts[i] = sel

    }

    return parts

  },

  replaceSelection: function(code, collapse, origin) {

    var dup = []

    for (var i = 0; i < this.sel.ranges.length; i++)

      { dup[i] = code }

    this.replaceSelections(dup, collapse, origin || "+input")

  },

  replaceSelections: docMethodOp(function(code, collapse, origin) {

    var this$1 = this;



    var changes = [], sel = this.sel

    for (var i = 0; i < sel.ranges.length; i++) {

      var range = sel.ranges[i]

      changes[i] = {from: range.from(), to: range.to(), text: this$1.splitLines(code[i]), origin: origin}

    }

    var newSel = collapse && collapse != "end" && computeReplacedSel(this, changes, collapse)

    for (var i$1 = changes.length - 1; i$1 >= 0; i$1--)

      { makeChange(this$1, changes[i$1]) }

    if (newSel) { setSelectionReplaceHistory(this, newSel) }

    else if (this.cm) { ensureCursorVisible(this.cm) }

  }),

  undo: docMethodOp(function() {makeChangeFromHistory(this, "undo")}),

  redo: docMethodOp(function() {makeChangeFromHistory(this, "redo")}),

  undoSelection: docMethodOp(function() {makeChangeFromHistory(this, "undo", true)}),

  redoSelection: docMethodOp(function() {makeChangeFromHistory(this, "redo", true)}),



  setExtending: function(val) {this.extend = val},

  getExtending: function() {return this.extend},



  historySize: function() {

    var hist = this.history, done = 0, undone = 0

    for (var i = 0; i < hist.done.length; i++) { if (!hist.done[i].ranges) { ++done } }

    for (var i$1 = 0; i$1 < hist.undone.length; i$1++) { if (!hist.undone[i$1].ranges) { ++undone } }

    return {undo: done, redo: undone}

  },

  clearHistory: function() {this.history = new History(this.history.maxGeneration)},



  markClean: function() {

    this.cleanGeneration = this.changeGeneration(true)

  },

  changeGeneration: function(forceSplit) {

    if (forceSplit)

      { this.history.lastOp = this.history.lastSelOp = this.history.lastOrigin = null }

    return this.history.generation

  },

  isClean: function (gen) {

    return this.history.generation == (gen || this.cleanGeneration)

  },



  getHistory: function() {

    return {done: copyHistoryArray(this.history.done),

            undone: copyHistoryArray(this.history.undone)}

  },

  setHistory: function(histData) {

    var hist = this.history = new History(this.history.maxGeneration)

    hist.done = copyHistoryArray(histData.done.slice(0), null, true)

    hist.undone = copyHistoryArray(histData.undone.slice(0), null, true)

  },



  setGutterMarker: docMethodOp(function(line, gutterID, value) {

    return changeLine(this, line, "gutter", function (line) {

      var markers = line.gutterMarkers || (line.gutterMarkers = {})

      markers[gutterID] = value

      if (!value && isEmpty(markers)) { line.gutterMarkers = null }

      return true

    })

  }),



  clearGutter: docMethodOp(function(gutterID) {

    var this$1 = this;



    this.iter(function (line) {

      if (line.gutterMarkers && line.gutterMarkers[gutterID]) {

        changeLine(this$1, line, "gutter", function () {

          line.gutterMarkers[gutterID] = null

          if (isEmpty(line.gutterMarkers)) { line.gutterMarkers = null }

          return true

        })

      }

    })

  }),



  lineInfo: function(line) {

    var n

    if (typeof line == "number") {

      if (!isLine(this, line)) { return null }

      n = line

      line = getLine(this, line)

      if (!line) { return null }

    } else {

      n = lineNo(line)

      if (n == null) { return null }

    }

    return {line: n, handle: line, text: line.text, gutterMarkers: line.gutterMarkers,

            textClass: line.textClass, bgClass: line.bgClass, wrapClass: line.wrapClass,

            widgets: line.widgets}

  },



  addLineClass: docMethodOp(function(handle, where, cls) {

    return changeLine(this, handle, where == "gutter" ? "gutter" : "class", function (line) {

      var prop = where == "text" ? "textClass"

               : where == "background" ? "bgClass"

               : where == "gutter" ? "gutterClass" : "wrapClass"

      if (!line[prop]) { line[prop] = cls }

      else if (classTest(cls).test(line[prop])) { return false }

      else { line[prop] += " " + cls }

      return true

    })

  }),

  removeLineClass: docMethodOp(function(handle, where, cls) {

    return changeLine(this, handle, where == "gutter" ? "gutter" : "class", function (line) {

      var prop = where == "text" ? "textClass"

               : where == "background" ? "bgClass"

               : where == "gutter" ? "gutterClass" : "wrapClass"

      var cur = line[prop]

      if (!cur) { return false }

      else if (cls == null) { line[prop] = null }

      else {

        var found = cur.match(classTest(cls))

        if (!found) { return false }

        var end = found.index + found[0].length

        line[prop] = cur.slice(0, found.index) + (!found.index || end == cur.length ? "" : " ") + cur.slice(end) || null

      }

      return true

    })

  }),



  addLineWidget: docMethodOp(function(handle, node, options) {

    return addLineWidget(this, handle, node, options)

  }),

  removeLineWidget: function(widget) { widget.clear() },



  markText: function(from, to, options) {

    return markText(this, clipPos(this, from), clipPos(this, to), options, options && options.type || "range")

  },

  setBookmark: function(pos, options) {

    var realOpts = {replacedWith: options && (options.nodeType == null ? options.widget : options),

                    insertLeft: options && options.insertLeft,

                    clearWhenEmpty: false, shared: options && options.shared,

                    handleMouseEvents: options && options.handleMouseEvents}

    pos = clipPos(this, pos)

    return markText(this, pos, pos, realOpts, "bookmark")

  },

  findMarksAt: function(pos) {

    pos = clipPos(this, pos)

    var markers = [], spans = getLine(this, pos.line).markedSpans

    if (spans) { for (var i = 0; i < spans.length; ++i) {

      var span = spans[i]

      if ((span.from == null || span.from <= pos.ch) &&

          (span.to == null || span.to >= pos.ch))

        { markers.push(span.marker.parent || span.marker) }

    } }

    return markers

  },

  findMarks: function(from, to, filter) {

    from = clipPos(this, from); to = clipPos(this, to)

    var found = [], lineNo = from.line

    this.iter(from.line, to.line + 1, function (line) {

      var spans = line.markedSpans

      if (spans) { for (var i = 0; i < spans.length; i++) {

        var span = spans[i]

        if (!(span.to != null && lineNo == from.line && from.ch >= span.to ||

              span.from == null && lineNo != from.line ||

              span.from != null && lineNo == to.line && span.from >= to.ch) &&

            (!filter || filter(span.marker)))

          { found.push(span.marker.parent || span.marker) }

      } }

      ++lineNo

    })

    return found

  },

  getAllMarks: function() {

    var markers = []

    this.iter(function (line) {

      var sps = line.markedSpans

      if (sps) { for (var i = 0; i < sps.length; ++i)

        { if (sps[i].from != null) { markers.push(sps[i].marker) } } }

    })

    return markers

  },



  posFromIndex: function(off) {

    var ch, lineNo = this.first, sepSize = this.lineSeparator().length

    this.iter(function (line) {

      var sz = line.text.length + sepSize

      if (sz > off) { ch = off; return true }

      off -= sz

      ++lineNo

    })

    return clipPos(this, Pos(lineNo, ch))

  },

  indexFromPos: function (coords) {

    coords = clipPos(this, coords)

    var index = coords.ch

    if (coords.line < this.first || coords.ch < 0) { return 0 }

    var sepSize = this.lineSeparator().length

    this.iter(this.first, coords.line, function (line) { // iter aborts when callback returns a truthy value

      index += line.text.length + sepSize

    })

    return index

  },



  copy: function(copyHistory) {

    var doc = new Doc(getLines(this, this.first, this.first + this.size),

                      this.modeOption, this.first, this.lineSep, this.direction)

    doc.scrollTop = this.scrollTop; doc.scrollLeft = this.scrollLeft

    doc.sel = this.sel

    doc.extend = false

    if (copyHistory) {

      doc.history.undoDepth = this.history.undoDepth

      doc.setHistory(this.getHistory())

    }

    return doc

  },



  linkedDoc: function(options) {

    if (!options) { options = {} }

    var from = this.first, to = this.first + this.size

    if (options.from != null && options.from > from) { from = options.from }

    if (options.to != null && options.to < to) { to = options.to }

    var copy = new Doc(getLines(this, from, to), options.mode || this.modeOption, from, this.lineSep, this.direction)

    if (options.sharedHist) { copy.history = this.history

    ; }(this.linked || (this.linked = [])).push({doc: copy, sharedHist: options.sharedHist})

    copy.linked = [{doc: this, isParent: true, sharedHist: options.sharedHist}]

    copySharedMarkers(copy, findSharedMarkers(this))

    return copy

  },

  unlinkDoc: function(other) {

    var this$1 = this;



    if (other instanceof CodeMirror) { other = other.doc }

    if (this.linked) { for (var i = 0; i < this.linked.length; ++i) {

      var link = this$1.linked[i]

      if (link.doc != other) { continue }

      this$1.linked.splice(i, 1)

      other.unlinkDoc(this$1)

      detachSharedMarkers(findSharedMarkers(this$1))

      break

    } }

    // If the histories were shared, split them again

    if (other.history == this.history) {

      var splitIds = [other.id]

      linkedDocs(other, function (doc) { return splitIds.push(doc.id); }, true)

      other.history = new History(null)

      other.history.done = copyHistoryArray(this.history.done, splitIds)

      other.history.undone = copyHistoryArray(this.history.undone, splitIds)

    }

  },

  iterLinkedDocs: function(f) {linkedDocs(this, f)},



  getMode: function() {return this.mode},

  getEditor: function() {return this.cm},



  splitLines: function(str) {

    if (this.lineSep) { return str.split(this.lineSep) }

    return splitLinesAuto(str)

  },

  lineSeparator: function() { return this.lineSep || "\n" },



  setDirection: docMethodOp(function (dir) {

    if (dir != "rtl") { dir = "ltr" }

    if (dir == this.direction) { return }

    this.direction = dir

    this.iter(function (line) { return line.order = null; })

    if (this.cm) { directionChanged(this.cm) }

  })

})



// Public alias.

Doc.prototype.eachLine = Doc.prototype.iter



// Kludge to work around strange IE behavior where it'll sometimes

// re-fire a series of drag-related events right after the drop (#1551)

var lastDrop = 0



function onDrop(e) {

  var cm = this

  clearDragCursor(cm)

  if (signalDOMEvent(cm, e) || eventInWidget(cm.display, e))

    { return }

  e_preventDefault(e)

  if (ie) { lastDrop = +new Date }

  var pos = posFromMouse(cm, e, true), files = e.dataTransfer.files

  if (!pos || cm.isReadOnly()) { return }

  // Might be a file drop, in which case we simply extract the text

  // and insert it.

  if (files && files.length && window.FileReader && window.File) {

    var n = files.length, text = Array(n), read = 0

    var loadFile = function (file, i) {

      if (cm.options.allowDropFileTypes &&

          indexOf(cm.options.allowDropFileTypes, file.type) == -1)

        { return }



      var reader = new FileReader

      reader.onload = operation(cm, function () {

        var content = reader.result

        if (/[\x00-\x08\x0e-\x1f]{2}/.test(content)) { content = "" }

        text[i] = content

        if (++read == n) {

          pos = clipPos(cm.doc, pos)

          var change = {from: pos, to: pos,

                        text: cm.doc.splitLines(text.join(cm.doc.lineSeparator())),

                        origin: "paste"}

          makeChange(cm.doc, change)

          setSelectionReplaceHistory(cm.doc, simpleSelection(pos, changeEnd(change)))

        }

      })

      reader.readAsText(file)

    }

    for (var i = 0; i < n; ++i) { loadFile(files[i], i) }

  } else { // Normal drop

    // Don't do a replace if the drop happened inside of the selected text.

    if (cm.state.draggingText && cm.doc.sel.contains(pos) > -1) {

      cm.state.draggingText(e)

      // Ensure the editor is re-focused

      setTimeout(function () { return cm.display.input.focus(); }, 20)

      return

    }

    try {

      var text$1 = e.dataTransfer.getData("Text")

      if (text$1) {

        var selected

        if (cm.state.draggingText && !cm.state.draggingText.copy)

          { selected = cm.listSelections() }

        setSelectionNoUndo(cm.doc, simpleSelection(pos, pos))

        if (selected) { for (var i$1 = 0; i$1 < selected.length; ++i$1)

          { replaceRange(cm.doc, "", selected[i$1].anchor, selected[i$1].head, "drag") } }

        cm.replaceSelection(text$1, "around", "paste")

        cm.display.input.focus()

      }

    }

    catch(e){}

  }

}



function onDragStart(cm, e) {

  if (ie && (!cm.state.draggingText || +new Date - lastDrop < 100)) { e_stop(e); return }

  if (signalDOMEvent(cm, e) || eventInWidget(cm.display, e)) { return }



  e.dataTransfer.setData("Text", cm.getSelection())

  e.dataTransfer.effectAllowed = "copyMove"



  // Use dummy image instead of default browsers image.

  // Recent Safari (~6.0.2) have a tendency to segfault when this happens, so we don't do it there.

  if (e.dataTransfer.setDragImage && !safari) {

    var img = elt("img", null, null, "position: fixed; left: 0; top: 0;")

    img.src = "data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw=="

    if (presto) {

      img.width = img.height = 1

      cm.display.wrapper.appendChild(img)

      // Force a relayout, or Opera won't use our image for some obscure reason

      img._top = img.offsetTop

    }

    e.dataTransfer.setDragImage(img, 0, 0)

    if (presto) { img.parentNode.removeChild(img) }

  }

}



function onDragOver(cm, e) {

  var pos = posFromMouse(cm, e)

  if (!pos) { return }

  var frag = document.createDocumentFragment()

  drawSelectionCursor(cm, pos, frag)

  if (!cm.display.dragCursor) {

    cm.display.dragCursor = elt("div", null, "CodeMirror-cursors CodeMirror-dragcursors")

    cm.display.lineSpace.insertBefore(cm.display.dragCursor, cm.display.cursorDiv)

  }

  removeChildrenAndAdd(cm.display.dragCursor, frag)

}



function clearDragCursor(cm) {

  if (cm.display.dragCursor) {

    cm.display.lineSpace.removeChild(cm.display.dragCursor)

    cm.display.dragCursor = null

  }

}



// These must be handled carefully, because naively registering a

// handler for each editor will cause the editors to never be

// garbage collected.



function forEachCodeMirror(f) {

  if (!document.getElementsByClassName) { return }

  var byClass = document.getElementsByClassName("CodeMirror")

  for (var i = 0; i < byClass.length; i++) {

    var cm = byClass[i].CodeMirror

    if (cm) { f(cm) }

  }

}



var globalsRegistered = false

function ensureGlobalHandlers() {

  if (globalsRegistered) { return }

  registerGlobalHandlers()

  globalsRegistered = true

}

function registerGlobalHandlers() {

  // When the window resizes, we need to refresh active editors.

  var resizeTimer

  on(window, "resize", function () {

    if (resizeTimer == null) { resizeTimer = setTimeout(function () {

      resizeTimer = null

      forEachCodeMirror(onResize)

    }, 100) }

  })

  // When the window loses focus, we want to show the editor as blurred

  on(window, "blur", function () { return forEachCodeMirror(onBlur); })

}

// Called when the window resizes

function onResize(cm) {

  var d = cm.display

  if (d.lastWrapHeight == d.wrapper.clientHeight && d.lastWrapWidth == d.wrapper.clientWidth)

    { return }

  // Might be a text scaling operation, clear size caches.

  d.cachedCharWidth = d.cachedTextHeight = d.cachedPaddingH = null

  d.scrollbarsClipped = false

  cm.setSize()

}



var keyNames = {

  3: "Enter", 8: "Backspace", 9: "Tab", 13: "Enter", 16: "Shift", 17: "Ctrl", 18: "Alt",

  19: "Pause", 20: "CapsLock", 27: "Esc", 32: "Space", 33: "PageUp", 34: "PageDown", 35: "End",

  36: "Home", 37: "Left", 38: "Up", 39: "Right", 40: "Down", 44: "PrintScrn", 45: "Insert",

  46: "Delete", 59: ";", 61: "=", 91: "Mod", 92: "Mod", 93: "Mod",

  106: "*", 107: "=", 109: "-", 110: ".", 111: "/", 127: "Delete",

  173: "-", 186: ";", 187: "=", 188: ",", 189: "-", 190: ".", 191: "/", 192: "`", 219: "[", 220: "\\",

  221: "]", 222: "'", 63232: "Up", 63233: "Down", 63234: "Left", 63235: "Right", 63272: "Delete",

  63273: "Home", 63275: "End", 63276: "PageUp", 63277: "PageDown", 63302: "Insert"

}



// Number keys

for (var i = 0; i < 10; i++) { keyNames[i + 48] = keyNames[i + 96] = String(i) }

// Alphabetic keys

for (var i$1 = 65; i$1 <= 90; i$1++) { keyNames[i$1] = String.fromCharCode(i$1) }

// Function keys

for (var i$2 = 1; i$2 <= 12; i$2++) { keyNames[i$2 + 111] = keyNames[i$2 + 63235] = "F" + i$2 }



var keyMap = {}



keyMap.basic = {

  "Left": "goCharLeft", "Right": "goCharRight", "Up": "goLineUp", "Down": "goLineDown",

  "End": "goLineEnd", "Home": "goLineStartSmart", "PageUp": "goPageUp", "PageDown": "goPageDown",

  "Delete": "delCharAfter", "Backspace": "delCharBefore", "Shift-Backspace": "delCharBefore",

  "Tab": "defaultTab", "Shift-Tab": "indentAuto",

  "Enter": "newlineAndIndent", "Insert": "toggleOverwrite",

  "Esc": "singleSelection"

}

// Note that the save and find-related commands aren't defined by

// default. User code or addons can define them. Unknown commands

// are simply ignored.

keyMap.pcDefault = {

  "Ctrl-A": "selectAll", "Ctrl-D": "deleteLine", "Ctrl-Z": "undo", "Shift-Ctrl-Z": "redo", "Ctrl-Y": "redo",

  "Ctrl-Home": "goDocStart", "Ctrl-End": "goDocEnd", "Ctrl-Up": "goLineUp", "Ctrl-Down": "goLineDown",

  "Ctrl-Left": "goGroupLeft", "Ctrl-Right": "goGroupRight", "Alt-Left": "goLineStart", "Alt-Right": "goLineEnd",

  "Ctrl-Backspace": "delGroupBefore", "Ctrl-Delete": "delGroupAfter", "Ctrl-S": "save", "Ctrl-F": "find",

  "Ctrl-G": "findNext", "Shift-Ctrl-G": "findPrev", "Shift-Ctrl-F": "replace", "Shift-Ctrl-R": "replaceAll",

  "Ctrl-[": "indentLess", "Ctrl-]": "indentMore",

  "Ctrl-U": "undoSelection", "Shift-Ctrl-U": "redoSelection", "Alt-U": "redoSelection",

  fallthrough: "basic"

}

// Very basic readline/emacs-style bindings, which are standard on Mac.

keyMap.emacsy = {

  "Ctrl-F": "goCharRight", "Ctrl-B": "goCharLeft", "Ctrl-P": "goLineUp", "Ctrl-N": "goLineDown",

  "Alt-F": "goWordRight", "Alt-B": "goWordLeft", "Ctrl-A": "goLineStart", "Ctrl-E": "goLineEnd",

  "Ctrl-V": "goPageDown", "Shift-Ctrl-V": "goPageUp", "Ctrl-D": "delCharAfter", "Ctrl-H": "delCharBefore",

  "Alt-D": "delWordAfter", "Alt-Backspace": "delWordBefore", "Ctrl-K": "killLine", "Ctrl-T": "transposeChars",

  "Ctrl-O": "openLine"

}

keyMap.macDefault = {

  "Cmd-A": "selectAll", "Cmd-D": "deleteLine", "Cmd-Z": "undo", "Shift-Cmd-Z": "redo", "Cmd-Y": "redo",

  "Cmd-Home": "goDocStart", "Cmd-Up": "goDocStart", "Cmd-End": "goDocEnd", "Cmd-Down": "goDocEnd", "Alt-Left": "goGroupLeft",

  "Alt-Right": "goGroupRight", "Cmd-Left": "goLineLeft", "Cmd-Right": "goLineRight", "Alt-Backspace": "delGroupBefore",

  "Ctrl-Alt-Backspace": "delGroupAfter", "Alt-Delete": "delGroupAfter", "Cmd-S": "save", "Cmd-F": "find",

  "Cmd-G": "findNext", "Shift-Cmd-G": "findPrev", "Cmd-Alt-F": "replace", "Shift-Cmd-Alt-F": "replaceAll",

  "Cmd-[": "indentLess", "Cmd-]": "indentMore", "Cmd-Backspace": "delWrappedLineLeft", "Cmd-Delete": "delWrappedLineRight",

  "Cmd-U": "undoSelection", "Shift-Cmd-U": "redoSelection", "Ctrl-Up": "goDocStart", "Ctrl-Down": "goDocEnd",

  fallthrough: ["basic", "emacsy"]

}

keyMap["default"] = mac ? keyMap.macDefault : keyMap.pcDefault



// KEYMAP DISPATCH



function normalizeKeyName(name) {

  var parts = name.split(/-(?!$)/)

  name = parts[parts.length - 1]

  var alt, ctrl, shift, cmd

  for (var i = 0; i < parts.length - 1; i++) {

    var mod = parts[i]

    if (/^(cmd|meta|m)$/i.test(mod)) { cmd = true }

    else if (/^a(lt)?$/i.test(mod)) { alt = true }

    else if (/^(c|ctrl|control)$/i.test(mod)) { ctrl = true }

    else if (/^s(hift)?$/i.test(mod)) { shift = true }

    else { throw new Error("Unrecognized modifier name: " + mod) }

  }

  if (alt) { name = "Alt-" + name }

  if (ctrl) { name = "Ctrl-" + name }

  if (cmd) { name = "Cmd-" + name }

  if (shift) { name = "Shift-" + name }

  return name

}



// This is a kludge to keep keymaps mostly working as raw objects

// (backwards compatibility) while at the same time support features

// like normalization and multi-stroke key bindings. It compiles a

// new normalized keymap, and then updates the old object to reflect

// this.

function normalizeKeyMap(keymap) {

  var copy = {}

  for (var keyname in keymap) { if (keymap.hasOwnProperty(keyname)) {

    var value = keymap[keyname]

    if (/^(name|fallthrough|(de|at)tach)$/.test(keyname)) { continue }

    if (value == "...") { delete keymap[keyname]; continue }



    var keys = map(keyname.split(" "), normalizeKeyName)

    for (var i = 0; i < keys.length; i++) {

      var val = (void 0), name = (void 0)

      if (i == keys.length - 1) {

        name = keys.join(" ")

        val = value

      } else {

        name = keys.slice(0, i + 1).join(" ")

        val = "..."

      }

      var prev = copy[name]

      if (!prev) { copy[name] = val }

      else if (prev != val) { throw new Error("Inconsistent bindings for " + name) }

    }

    delete keymap[keyname]

  } }

  for (var prop in copy) { keymap[prop] = copy[prop] }

  return keymap

}



function lookupKey(key, map, handle, context) {

  map = getKeyMap(map)

  var found = map.call ? map.call(key, context) : map[key]

  if (found === false) { return "nothing" }

  if (found === "...") { return "multi" }

  if (found != null && handle(found)) { return "handled" }



  if (map.fallthrough) {

    if (Object.prototype.toString.call(map.fallthrough) != "[object Array]")

      { return lookupKey(key, map.fallthrough, handle, context) }

    for (var i = 0; i < map.fallthrough.length; i++) {

      var result = lookupKey(key, map.fallthrough[i], handle, context)

      if (result) { return result }

    }

  }

}



// Modifier key presses don't count as 'real' key presses for the

// purpose of keymap fallthrough.

function isModifierKey(value) {

  var name = typeof value == "string" ? value : keyNames[value.keyCode]

  return name == "Ctrl" || name == "Alt" || name == "Shift" || name == "Mod"

}



function addModifierNames(name, event, noShift) {

  var base = name

  if (event.altKey && base != "Alt") { name = "Alt-" + name }

  if ((flipCtrlCmd ? event.metaKey : event.ctrlKey) && base != "Ctrl") { name = "Ctrl-" + name }

  if ((flipCtrlCmd ? event.ctrlKey : event.metaKey) && base != "Cmd") { name = "Cmd-" + name }

  if (!noShift && event.shiftKey && base != "Shift") { name = "Shift-" + name }

  return name

}



// Look up the name of a key as indicated by an event object.

function keyName(event, noShift) {

  if (presto && event.keyCode == 34 && event["char"]) { return false }

  var name = keyNames[event.keyCode]

  if (name == null || event.altGraphKey) { return false }

  return addModifierNames(name, event, noShift)

}



function getKeyMap(val) {

  return typeof val == "string" ? keyMap[val] : val

}



// Helper for deleting text near the selection(s), used to implement

// backspace, delete, and similar functionality.

function deleteNearSelection(cm, compute) {

  var ranges = cm.doc.sel.ranges, kill = []

  // Build up a set of ranges to kill first, merging overlapping

  // ranges.

  for (var i = 0; i < ranges.length; i++) {

    var toKill = compute(ranges[i])

    while (kill.length && cmp(toKill.from, lst(kill).to) <= 0) {

      var replaced = kill.pop()

      if (cmp(replaced.from, toKill.from) < 0) {

        toKill.from = replaced.from

        break

      }

    }

    kill.push(toKill)

  }

  // Next, remove those actual ranges.

  runInOp(cm, function () {

    for (var i = kill.length - 1; i >= 0; i--)

      { replaceRange(cm.doc, "", kill[i].from, kill[i].to, "+delete") }

    ensureCursorVisible(cm)

  })

}



function moveCharLogically(line, ch, dir) {

  var target = skipExtendingChars(line.text, ch + dir, dir)

  return target < 0 || target > line.text.length ? null : target

}



function moveLogically(line, start, dir) {

  var ch = moveCharLogically(line, start.ch, dir)

  return ch == null ? null : new Pos(start.line, ch, dir < 0 ? "after" : "before")

}



function endOfLine(visually, cm, lineObj, lineNo, dir) {

  if (visually) {

    var order = getOrder(lineObj, cm.doc.direction)

    if (order) {

      var part = dir < 0 ? lst(order) : order[0]

      var moveInStorageOrder = (dir < 0) == (part.level == 1)

      var sticky = moveInStorageOrder ? "after" : "before"

      var ch

      // With a wrapped rtl chunk (possibly spanning multiple bidi parts),

      // it could be that the last bidi part is not on the last visual line,

      // since visual lines contain content order-consecutive chunks.

      // Thus, in rtl, we are looking for the first (content-order) character

      // in the rtl chunk that is on the last line (that is, the same line

      // as the last (content-order) character).

      if (part.level > 0 || cm.doc.direction == "rtl") {

        var prep = prepareMeasureForLine(cm, lineObj)

        ch = dir < 0 ? lineObj.text.length - 1 : 0

        var targetTop = measureCharPrepared(cm, prep, ch).top

        ch = findFirst(function (ch) { return measureCharPrepared(cm, prep, ch).top == targetTop; }, (dir < 0) == (part.level == 1) ? part.from : part.to - 1, ch)

        if (sticky == "before") { ch = moveCharLogically(lineObj, ch, 1) }

      } else { ch = dir < 0 ? part.to : part.from }

      return new Pos(lineNo, ch, sticky)

    }

  }

  return new Pos(lineNo, dir < 0 ? lineObj.text.length : 0, dir < 0 ? "before" : "after")

}



function moveVisually(cm, line, start, dir) {

  var bidi = getOrder(line, cm.doc.direction)

  if (!bidi) { return moveLogically(line, start, dir) }

  if (start.ch >= line.text.length) {

    start.ch = line.text.length

    start.sticky = "before"

  } else if (start.ch <= 0) {

    start.ch = 0

    start.sticky = "after"

  }

  var partPos = getBidiPartAt(bidi, start.ch, start.sticky), part = bidi[partPos]

  if (cm.doc.direction == "ltr" && part.level % 2 == 0 && (dir > 0 ? part.to > start.ch : part.from < start.ch)) {

    // Case 1: We move within an ltr part in an ltr editor. Even with wrapped lines,

    // nothing interesting happens.

    return moveLogically(line, start, dir)

  }



  var mv = function (pos, dir) { return moveCharLogically(line, pos instanceof Pos ? pos.ch : pos, dir); }

  var prep

  var getWrappedLineExtent = function (ch) {

    if (!cm.options.lineWrapping) { return {begin: 0, end: line.text.length} }

    prep = prep || prepareMeasureForLine(cm, line)

    return wrappedLineExtentChar(cm, line, prep, ch)

  }

  var wrappedLineExtent = getWrappedLineExtent(start.sticky == "before" ? mv(start, -1) : start.ch)



  if (cm.doc.direction == "rtl" || part.level == 1) {

    var moveInStorageOrder = (part.level == 1) == (dir < 0)

    var ch = mv(start, moveInStorageOrder ? 1 : -1)

    if (ch != null && (!moveInStorageOrder ? ch >= part.from && ch >= wrappedLineExtent.begin : ch <= part.to && ch <= wrappedLineExtent.end)) {

      // Case 2: We move within an rtl part or in an rtl editor on the same visual line

      var sticky = moveInStorageOrder ? "before" : "after"

      return new Pos(start.line, ch, sticky)

    }

  }



  // Case 3: Could not move within this bidi part in this visual line, so leave

  // the current bidi part



  var searchInVisualLine = function (partPos, dir, wrappedLineExtent) {

    var getRes = function (ch, moveInStorageOrder) { return moveInStorageOrder

      ? new Pos(start.line, mv(ch, 1), "before")

      : new Pos(start.line, ch, "after"); }



    for (; partPos >= 0 && partPos < bidi.length; partPos += dir) {

      var part = bidi[partPos]

      var moveInStorageOrder = (dir > 0) == (part.level != 1)

      var ch = moveInStorageOrder ? wrappedLineExtent.begin : mv(wrappedLineExtent.end, -1)

      if (part.from <= ch && ch < part.to) { return getRes(ch, moveInStorageOrder) }

      ch = moveInStorageOrder ? part.from : mv(part.to, -1)

      if (wrappedLineExtent.begin <= ch && ch < wrappedLineExtent.end) { return getRes(ch, moveInStorageOrder) }

    }

  }



  // Case 3a: Look for other bidi parts on the same visual line

  var res = searchInVisualLine(partPos + dir, dir, wrappedLineExtent)

  if (res) { return res }



  // Case 3b: Look for other bidi parts on the next visual line

  var nextCh = dir > 0 ? wrappedLineExtent.end : mv(wrappedLineExtent.begin, -1)

  if (nextCh != null && !(dir > 0 && nextCh == line.text.length)) {

    res = searchInVisualLine(dir > 0 ? 0 : bidi.length - 1, dir, getWrappedLineExtent(nextCh))

    if (res) { return res }

  }



  // Case 4: Nowhere to move

  return null

}



// Commands are parameter-less actions that can be performed on an

// editor, mostly used for keybindings.

var commands = {

  selectAll: selectAll,

  singleSelection: function (cm) { return cm.setSelection(cm.getCursor("anchor"), cm.getCursor("head"), sel_dontScroll); },

  killLine: function (cm) { return deleteNearSelection(cm, function (range) {

    if (range.empty()) {

      var len = getLine(cm.doc, range.head.line).text.length

      if (range.head.ch == len && range.head.line < cm.lastLine())

        { return {from: range.head, to: Pos(range.head.line + 1, 0)} }

      else

        { return {from: range.head, to: Pos(range.head.line, len)} }

    } else {

      return {from: range.from(), to: range.to()}

    }

  }); },

  deleteLine: function (cm) { return deleteNearSelection(cm, function (range) { return ({

    from: Pos(range.from().line, 0),

    to: clipPos(cm.doc, Pos(range.to().line + 1, 0))

  }); }); },

  delLineLeft: function (cm) { return deleteNearSelection(cm, function (range) { return ({

    from: Pos(range.from().line, 0), to: range.from()

  }); }); },

  delWrappedLineLeft: function (cm) { return deleteNearSelection(cm, function (range) {

    var top = cm.charCoords(range.head, "div").top + 5

    var leftPos = cm.coordsChar({left: 0, top: top}, "div")

    return {from: leftPos, to: range.from()}

  }); },

  delWrappedLineRight: function (cm) { return deleteNearSelection(cm, function (range) {

    var top = cm.charCoords(range.head, "div").top + 5

    var rightPos = cm.coordsChar({left: cm.display.lineDiv.offsetWidth + 100, top: top}, "div")

    return {from: range.from(), to: rightPos }

  }); },

  undo: function (cm) { return cm.undo(); },

  redo: function (cm) { return cm.redo(); },

  undoSelection: function (cm) { return cm.undoSelection(); },

  redoSelection: function (cm) { return cm.redoSelection(); },

  goDocStart: function (cm) { return cm.extendSelection(Pos(cm.firstLine(), 0)); },

  goDocEnd: function (cm) { return cm.extendSelection(Pos(cm.lastLine())); },

  goLineStart: function (cm) { return cm.extendSelectionsBy(function (range) { return lineStart(cm, range.head.line); },

    {origin: "+move", bias: 1}

  ); },

  goLineStartSmart: function (cm) { return cm.extendSelectionsBy(function (range) { return lineStartSmart(cm, range.head); },

    {origin: "+move", bias: 1}

  ); },

  goLineEnd: function (cm) { return cm.extendSelectionsBy(function (range) { return lineEnd(cm, range.head.line); },

    {origin: "+move", bias: -1}

  ); },

  goLineRight: function (cm) { return cm.extendSelectionsBy(function (range) {

    var top = cm.cursorCoords(range.head, "div").top + 5

    return cm.coordsChar({left: cm.display.lineDiv.offsetWidth + 100, top: top}, "div")

  }, sel_move); },

  goLineLeft: function (cm) { return cm.extendSelectionsBy(function (range) {

    var top = cm.cursorCoords(range.head, "div").top + 5

    return cm.coordsChar({left: 0, top: top}, "div")

  }, sel_move); },

  goLineLeftSmart: function (cm) { return cm.extendSelectionsBy(function (range) {

    var top = cm.cursorCoords(range.head, "div").top + 5

    var pos = cm.coordsChar({left: 0, top: top}, "div")

    if (pos.ch < cm.getLine(pos.line).search(/\S/)) { return lineStartSmart(cm, range.head) }

    return pos

  }, sel_move); },

  goLineUp: function (cm) { return cm.moveV(-1, "line"); },

  goLineDown: function (cm) { return cm.moveV(1, "line"); },

  goPageUp: function (cm) { return cm.moveV(-1, "page"); },

  goPageDown: function (cm) { return cm.moveV(1, "page"); },

  goCharLeft: function (cm) { return cm.moveH(-1, "char"); },

  goCharRight: function (cm) { return cm.moveH(1, "char"); },

  goColumnLeft: function (cm) { return cm.moveH(-1, "column"); },

  goColumnRight: function (cm) { return cm.moveH(1, "column"); },

  goWordLeft: function (cm) { return cm.moveH(-1, "word"); },

  goGroupRight: function (cm) { return cm.moveH(1, "group"); },

  goGroupLeft: function (cm) { return cm.moveH(-1, "group"); },

  goWordRight: function (cm) { return cm.moveH(1, "word"); },

  delCharBefore: function (cm) { return cm.deleteH(-1, "char"); },

  delCharAfter: function (cm) { return cm.deleteH(1, "char"); },

  delWordBefore: function (cm) { return cm.deleteH(-1, "word"); },

  delWordAfter: function (cm) { return cm.deleteH(1, "word"); },

  delGroupBefore: function (cm) { return cm.deleteH(-1, "group"); },

  delGroupAfter: function (cm) { return cm.deleteH(1, "group"); },

  indentAuto: function (cm) { return cm.indentSelection("smart"); },

  indentMore: function (cm) { return cm.indentSelection("add"); },

  indentLess: function (cm) { return cm.indentSelection("subtract"); },

  insertTab: function (cm) { return cm.replaceSelection("\t"); },

  insertSoftTab: function (cm) {

    var spaces = [], ranges = cm.listSelections(), tabSize = cm.options.tabSize

    for (var i = 0; i < ranges.length; i++) {

      var pos = ranges[i].from()

      var col = countColumn(cm.getLine(pos.line), pos.ch, tabSize)

      spaces.push(spaceStr(tabSize - col % tabSize))

    }

    cm.replaceSelections(spaces)

  },

  defaultTab: function (cm) {

    if (cm.somethingSelected()) { cm.indentSelection("add") }

    else { cm.execCommand("insertTab") }

  },

  // Swap the two chars left and right of each selection's head.

  // Move cursor behind the two swapped characters afterwards.

  //

  // Doesn't consider line feeds a character.

  // Doesn't scan more than one line above to find a character.

  // Doesn't do anything on an empty line.

  // Doesn't do anything with non-empty selections.

  transposeChars: function (cm) { return runInOp(cm, function () {

    var ranges = cm.listSelections(), newSel = []

    for (var i = 0; i < ranges.length; i++) {

      if (!ranges[i].empty()) { continue }

      var cur = ranges[i].head, line = getLine(cm.doc, cur.line).text

      if (line) {

        if (cur.ch == line.length) { cur = new Pos(cur.line, cur.ch - 1) }

        if (cur.ch > 0) {

          cur = new Pos(cur.line, cur.ch + 1)

          cm.replaceRange(line.charAt(cur.ch - 1) + line.charAt(cur.ch - 2),

                          Pos(cur.line, cur.ch - 2), cur, "+transpose")

        } else if (cur.line > cm.doc.first) {

          var prev = getLine(cm.doc, cur.line - 1).text

          if (prev) {

            cur = new Pos(cur.line, 1)

            cm.replaceRange(line.charAt(0) + cm.doc.lineSeparator() +

                            prev.charAt(prev.length - 1),

                            Pos(cur.line - 1, prev.length - 1), cur, "+transpose")

          }

        }

      }

      newSel.push(new Range(cur, cur))

    }

    cm.setSelections(newSel)

  }); },

  newlineAndIndent: function (cm) { return runInOp(cm, function () {

    var sels = cm.listSelections()

    for (var i = sels.length - 1; i >= 0; i--)

      { cm.replaceRange(cm.doc.lineSeparator(), sels[i].anchor, sels[i].head, "+input") }

    sels = cm.listSelections()

    for (var i$1 = 0; i$1 < sels.length; i$1++)

      { cm.indentLine(sels[i$1].from().line, null, true) }

    ensureCursorVisible(cm)

  }); },

  openLine: function (cm) { return cm.replaceSelection("\n", "start"); },

  toggleOverwrite: function (cm) { return cm.toggleOverwrite(); }

}





function lineStart(cm, lineN) {

  var line = getLine(cm.doc, lineN)

  var visual = visualLine(line)

  if (visual != line) { lineN = lineNo(visual) }

  return endOfLine(true, cm, visual, lineN, 1)

}

function lineEnd(cm, lineN) {

  var line = getLine(cm.doc, lineN)

  var visual = visualLineEnd(line)

  if (visual != line) { lineN = lineNo(visual) }

  return endOfLine(true, cm, line, lineN, -1)

}

function lineStartSmart(cm, pos) {

  var start = lineStart(cm, pos.line)

  var line = getLine(cm.doc, start.line)

  var order = getOrder(line, cm.doc.direction)

  if (!order || order[0].level == 0) {

    var firstNonWS = Math.max(0, line.text.search(/\S/))

    var inWS = pos.line == start.line && pos.ch <= firstNonWS && pos.ch

    return Pos(start.line, inWS ? 0 : firstNonWS, start.sticky)

  }

  return start

}



// Run a handler that was bound to a key.

function doHandleBinding(cm, bound, dropShift) {

  if (typeof bound == "string") {

    bound = commands[bound]

    if (!bound) { return false }

  }

  // Ensure previous input has been read, so that the handler sees a

  // consistent view of the document

  cm.display.input.ensurePolled()

  var prevShift = cm.display.shift, done = false

  try {

    if (cm.isReadOnly()) { cm.state.suppressEdits = true }

    if (dropShift) { cm.display.shift = false }

    done = bound(cm) != Pass

  } finally {

    cm.display.shift = prevShift

    cm.state.suppressEdits = false

  }

  return done

}



function lookupKeyForEditor(cm, name, handle) {

  for (var i = 0; i < cm.state.keyMaps.length; i++) {

    var result = lookupKey(name, cm.state.keyMaps[i], handle, cm)

    if (result) { return result }

  }

  return (cm.options.extraKeys && lookupKey(name, cm.options.extraKeys, handle, cm))

    || lookupKey(name, cm.options.keyMap, handle, cm)

}



// Note that, despite the name, this function is also used to check

// for bound mouse clicks.



var stopSeq = new Delayed



function dispatchKey(cm, name, e, handle) {

  var seq = cm.state.keySeq

  if (seq) {

    if (isModifierKey(name)) { return "handled" }

    if (/\'$/.test(name))

      { cm.state.keySeq = null }

    else

      { stopSeq.set(50, function () {

        if (cm.state.keySeq == seq) {

          cm.state.keySeq = null

          cm.display.input.reset()

        }

      }) }

    if (dispatchKeyInner(cm, seq + " " + name, e, handle)) { return true }

  }

  return dispatchKeyInner(cm, name, e, handle)

}



function dispatchKeyInner(cm, name, e, handle) {

  var result = lookupKeyForEditor(cm, name, handle)



  if (result == "multi")

    { cm.state.keySeq = name }

  if (result == "handled")

    { signalLater(cm, "keyHandled", cm, name, e) }



  if (result == "handled" || result == "multi") {

    e_preventDefault(e)

    restartBlink(cm)

  }



  return !!result

}



// Handle a key from the keydown event.

function handleKeyBinding(cm, e) {

  var name = keyName(e, true)

  if (!name) { return false }



  if (e.shiftKey && !cm.state.keySeq) {

    // First try to resolve full name (including 'Shift-'). Failing

    // that, see if there is a cursor-motion command (starting with

    // 'go') bound to the keyname without 'Shift-'.

    return dispatchKey(cm, "Shift-" + name, e, function (b) { return doHandleBinding(cm, b, true); })

        || dispatchKey(cm, name, e, function (b) {

             if (typeof b == "string" ? /^go[A-Z]/.test(b) : b.motion)

               { return doHandleBinding(cm, b) }

           })

  } else {

    return dispatchKey(cm, name, e, function (b) { return doHandleBinding(cm, b); })

  }

}



// Handle a key from the keypress event

function handleCharBinding(cm, e, ch) {

  return dispatchKey(cm, "'" + ch + "'", e, function (b) { return doHandleBinding(cm, b, true); })

}



var lastStoppedKey = null

function onKeyDown(e) {

  var cm = this

  cm.curOp.focus = activeElt()

  if (signalDOMEvent(cm, e)) { return }

  // IE does strange things with escape.

  if (ie && ie_version < 11 && e.keyCode == 27) { e.returnValue = false }

  var code = e.keyCode

  cm.display.shift = code == 16 || e.shiftKey

  var handled = handleKeyBinding(cm, e)

  if (presto) {

    lastStoppedKey = handled ? code : null

    // Opera has no cut event... we try to at least catch the key combo

    if (!handled && code == 88 && !hasCopyEvent && (mac ? e.metaKey : e.ctrlKey))

      { cm.replaceSelection("", null, "cut") }

  }



  // Turn mouse into crosshair when Alt is held on Mac.

  if (code == 18 && !/\bCodeMirror-crosshair\b/.test(cm.display.lineDiv.className))

    { showCrossHair(cm) }

}



function showCrossHair(cm) {

  var lineDiv = cm.display.lineDiv

  addClass(lineDiv, "CodeMirror-crosshair")



  function up(e) {

    if (e.keyCode == 18 || !e.altKey) {

      rmClass(lineDiv, "CodeMirror-crosshair")

      off(document, "keyup", up)

      off(document, "mouseover", up)

    }

  }

  on(document, "keyup", up)

  on(document, "mouseover", up)

}



function onKeyUp(e) {

  if (e.keyCode == 16) { this.doc.sel.shift = false }

  signalDOMEvent(this, e)

}



function onKeyPress(e) {

  var cm = this

  if (eventInWidget(cm.display, e) || signalDOMEvent(cm, e) || e.ctrlKey && !e.altKey || mac && e.metaKey) { return }

  var keyCode = e.keyCode, charCode = e.charCode

  if (presto && keyCode == lastStoppedKey) {lastStoppedKey = null; e_preventDefault(e); return}

  if ((presto && (!e.which || e.which < 10)) && handleKeyBinding(cm, e)) { return }

  var ch = String.fromCharCode(charCode == null ? keyCode : charCode)

  // Some browsers fire keypress events for backspace

  if (ch == "\x08") { return }

  if (handleCharBinding(cm, e, ch)) { return }

  cm.display.input.onKeyPress(e)

}



var DOUBLECLICK_DELAY = 400



var PastClick = function(time, pos, button) {

  this.time = time

  this.pos = pos

  this.button = button

};



PastClick.prototype.compare = function (time, pos, button) {

  return this.time + DOUBLECLICK_DELAY > time &&

    cmp(pos, this.pos) == 0 && button == this.button

};



var lastClick;

var lastDoubleClick;

function clickRepeat(pos, button) {

  var now = +new Date

  if (lastDoubleClick && lastDoubleClick.compare(now, pos, button)) {

    lastClick = lastDoubleClick = null

    return "triple"

  } else if (lastClick && lastClick.compare(now, pos, button)) {

    lastDoubleClick = new PastClick(now, pos, button)

    lastClick = null

    return "double"

  } else {

    lastClick = new PastClick(now, pos, button)

    lastDoubleClick = null

    return "single"

  }

}



// A mouse down can be a single click, double click, triple click,

// start of selection drag, start of text drag, new cursor

// (ctrl-click), rectangle drag (alt-drag), or xwin

// middle-click-paste. Or it might be a click on something we should

// not interfere with, such as a scrollbar or widget.

function onMouseDown(e) {

  var cm = this, display = cm.display

  if (signalDOMEvent(cm, e) || display.activeTouch && display.input.supportsTouch()) { return }

  display.input.ensurePolled()

  display.shift = e.shiftKey



  if (eventInWidget(display, e)) {

    if (!webkit) {

      // Briefly turn off draggability, to allow widgets to do

      // normal dragging things.

      display.scroller.draggable = false

      setTimeout(function () { return display.scroller.draggable = true; }, 100)

    }

    return

  }

  if (clickInGutter(cm, e)) { return }

  var pos = posFromMouse(cm, e), button = e_button(e), repeat = pos ? clickRepeat(pos, button) : "single"

  window.focus()



  // #3261: make sure, that we're not starting a second selection

  if (button == 1 && cm.state.selectingText)

    { cm.state.selectingText(e) }



  if (pos && handleMappedButton(cm, button, pos, repeat, e)) { return }



  if (button == 1) {

    if (pos) { leftButtonDown(cm, pos, repeat, e) }

    else if (e_target(e) == display.scroller) { e_preventDefault(e) }

  } else if (button == 2) {

    if (pos) { extendSelection(cm.doc, pos) }

    setTimeout(function () { return display.input.focus(); }, 20)

  } else if (button == 3) {

    if (captureRightClick) { onContextMenu(cm, e) }

    else { delayBlurEvent(cm) }

  }

}



function handleMappedButton(cm, button, pos, repeat, event) {

  var name = "Click"

  if (repeat == "double") { name = "Double" + name }

  else if (repeat == "triple") { name = "Triple" + name }

  name = (button == 1 ? "Left" : button == 2 ? "Middle" : "Right") + name



  return dispatchKey(cm,  addModifierNames(name, event), event, function (bound) {

    if (typeof bound == "string") { bound = commands[bound] }

    if (!bound) { return false }

    var done = false

    try {

      if (cm.isReadOnly()) { cm.state.suppressEdits = true }

      done = bound(cm, pos) != Pass

    } finally {

      cm.state.suppressEdits = false

    }

    return done

  })

}



function configureMouse(cm, repeat, event) {

  var option = cm.getOption("configureMouse")

  var value = option ? option(cm, repeat, event) : {}

  if (value.unit == null) {

    var rect = chromeOS ? event.shiftKey && event.metaKey : event.altKey

    value.unit = rect ? "rectangle" : repeat == "single" ? "char" : repeat == "double" ? "word" : "line"

  }

  if (value.extend == null || cm.doc.extend) { value.extend = cm.doc.extend || event.shiftKey }

  if (value.addNew == null) { value.addNew = mac ? event.metaKey : event.ctrlKey }

  if (value.moveOnDrag == null) { value.moveOnDrag = !(mac ? event.altKey : event.ctrlKey) }

  return value

}



function leftButtonDown(cm, pos, repeat, event) {

  if (ie) { setTimeout(bind(ensureFocus, cm), 0) }

  else { cm.curOp.focus = activeElt() }



  var behavior = configureMouse(cm, repeat, event)



  var sel = cm.doc.sel, contained

  if (cm.options.dragDrop && dragAndDrop && !cm.isReadOnly() &&

      repeat == "single" && (contained = sel.contains(pos)) > -1 &&

      (cmp((contained = sel.ranges[contained]).from(), pos) < 0 || pos.xRel > 0) &&

      (cmp(contained.to(), pos) > 0 || pos.xRel < 0))

    { leftButtonStartDrag(cm, event, pos, behavior) }

  else

    { leftButtonSelect(cm, event, pos, behavior) }

}



// Start a text drag. When it ends, see if any dragging actually

// happen, and treat as a click if it didn't.

function leftButtonStartDrag(cm, event, pos, behavior) {

  var display = cm.display, moved = false

  var dragEnd = operation(cm, function (e) {

    if (webkit) { display.scroller.draggable = false }

    cm.state.draggingText = false

    off(document, "mouseup", dragEnd)

    off(document, "mousemove", mouseMove)

    off(display.scroller, "dragstart", dragStart)

    off(display.scroller, "drop", dragEnd)

    if (!moved) {

      e_preventDefault(e)

      if (!behavior.addNew)

        { extendSelection(cm.doc, pos, null, null, behavior.extend) }

      // Work around unexplainable focus problem in IE9 (#2127) and Chrome (#3081)

      if (webkit || ie && ie_version == 9)

        { setTimeout(function () {document.body.focus(); display.input.focus()}, 20) }

      else

        { display.input.focus() }

    }

  })

  var mouseMove = function(e2) {

    moved = moved || Math.abs(event.clientX - e2.clientX) + Math.abs(event.clientY - e2.clientY) >= 10

  }

  var dragStart = function () { return moved = true; }

  // Let the drag handler handle this.

  if (webkit) { display.scroller.draggable = true }

  cm.state.draggingText = dragEnd

  dragEnd.copy = !behavior.moveOnDrag

  // IE's approach to draggable

  if (display.scroller.dragDrop) { display.scroller.dragDrop() }

  on(document, "mouseup", dragEnd)

  on(document, "mousemove", mouseMove)

  on(display.scroller, "dragstart", dragStart)

  on(display.scroller, "drop", dragEnd)



  delayBlurEvent(cm)

  setTimeout(function () { return display.input.focus(); }, 20)

}



function rangeForUnit(cm, pos, unit) {

  if (unit == "char") { return new Range(pos, pos) }

  if (unit == "word") { return cm.findWordAt(pos) }

  if (unit == "line") { return new Range(Pos(pos.line, 0), clipPos(cm.doc, Pos(pos.line + 1, 0))) }

  var result = unit(cm, pos)

  return new Range(result.from, result.to)

}



// Normal selection, as opposed to text dragging.

function leftButtonSelect(cm, event, start, behavior) {

  var display = cm.display, doc = cm.doc

  e_preventDefault(event)



  var ourRange, ourIndex, startSel = doc.sel, ranges = startSel.ranges

  if (behavior.addNew && !behavior.extend) {

    ourIndex = doc.sel.contains(start)

    if (ourIndex > -1)

      { ourRange = ranges[ourIndex] }

    else

      { ourRange = new Range(start, start) }

  } else {

    ourRange = doc.sel.primary()

    ourIndex = doc.sel.primIndex

  }



  if (behavior.unit == "rectangle") {

    if (!behavior.addNew) { ourRange = new Range(start, start) }

    start = posFromMouse(cm, event, true, true)

    ourIndex = -1

  } else {

    var range = rangeForUnit(cm, start, behavior.unit)

    if (behavior.extend)

      { ourRange = extendRange(ourRange, range.anchor, range.head, behavior.extend) }

    else

      { ourRange = range }

  }



  if (!behavior.addNew) {

    ourIndex = 0

    setSelection(doc, new Selection([ourRange], 0), sel_mouse)

    startSel = doc.sel

  } else if (ourIndex == -1) {

    ourIndex = ranges.length

    setSelection(doc, normalizeSelection(ranges.concat([ourRange]), ourIndex),

                 {scroll: false, origin: "*mouse"})

  } else if (ranges.length > 1 && ranges[ourIndex].empty() && behavior.unit == "char" && !behavior.extend) {

    setSelection(doc, normalizeSelection(ranges.slice(0, ourIndex).concat(ranges.slice(ourIndex + 1)), 0),

                 {scroll: false, origin: "*mouse"})

    startSel = doc.sel

  } else {

    replaceOneSelection(doc, ourIndex, ourRange, sel_mouse)

  }



  var lastPos = start

  function extendTo(pos) {

    if (cmp(lastPos, pos) == 0) { return }

    lastPos = pos



    if (behavior.unit == "rectangle") {

      var ranges = [], tabSize = cm.options.tabSize

      var startCol = countColumn(getLine(doc, start.line).text, start.ch, tabSize)

      var posCol = countColumn(getLine(doc, pos.line).text, pos.ch, tabSize)

      var left = Math.min(startCol, posCol), right = Math.max(startCol, posCol)

      for (var line = Math.min(start.line, pos.line), end = Math.min(cm.lastLine(), Math.max(start.line, pos.line));

           line <= end; line++) {

        var text = getLine(doc, line).text, leftPos = findColumn(text, left, tabSize)

        if (left == right)

          { ranges.push(new Range(Pos(line, leftPos), Pos(line, leftPos))) }

        else if (text.length > leftPos)

          { ranges.push(new Range(Pos(line, leftPos), Pos(line, findColumn(text, right, tabSize)))) }

      }

      if (!ranges.length) { ranges.push(new Range(start, start)) }

      setSelection(doc, normalizeSelection(startSel.ranges.slice(0, ourIndex).concat(ranges), ourIndex),

                   {origin: "*mouse", scroll: false})

      cm.scrollIntoView(pos)

    } else {

      var oldRange = ourRange

      var range = rangeForUnit(cm, pos, behavior.unit)

      var anchor = oldRange.anchor, head

      if (cmp(range.anchor, anchor) > 0) {

        head = range.head

        anchor = minPos(oldRange.from(), range.anchor)

      } else {

        head = range.anchor

        anchor = maxPos(oldRange.to(), range.head)

      }

      var ranges$1 = startSel.ranges.slice(0)

      ranges$1[ourIndex] = bidiSimplify(cm, new Range(clipPos(doc, anchor), head))

      setSelection(doc, normalizeSelection(ranges$1, ourIndex), sel_mouse)

    }

  }



  var editorSize = display.wrapper.getBoundingClientRect()

  // Used to ensure timeout re-tries don't fire when another extend

  // happened in the meantime (clearTimeout isn't reliable -- at

  // least on Chrome, the timeouts still happen even when cleared,

  // if the clear happens after their scheduled firing time).

  var counter = 0



  function extend(e) {

    var curCount = ++counter

    var cur = posFromMouse(cm, e, true, behavior.unit == "rectangle")

    if (!cur) { return }

    if (cmp(cur, lastPos) != 0) {

      cm.curOp.focus = activeElt()

      extendTo(cur)

      var visible = visibleLines(display, doc)

      if (cur.line >= visible.to || cur.line < visible.from)

        { setTimeout(operation(cm, function () {if (counter == curCount) { extend(e) }}), 150) }

    } else {

      var outside = e.clientY < editorSize.top ? -20 : e.clientY > editorSize.bottom ? 20 : 0

      if (outside) { setTimeout(operation(cm, function () {

        if (counter != curCount) { return }

        display.scroller.scrollTop += outside

        extend(e)

      }), 50) }

    }

  }



  function done(e) {

    cm.state.selectingText = false

    counter = Infinity

    e_preventDefault(e)

    display.input.focus()

    off(document, "mousemove", move)

    off(document, "mouseup", up)

    doc.history.lastSelOrigin = null

  }



  var move = operation(cm, function (e) {

    if (!e_button(e)) { done(e) }

    else { extend(e) }

  })

  var up = operation(cm, done)

  cm.state.selectingText = up

  on(document, "mousemove", move)

  on(document, "mouseup", up)

}



// Used when mouse-selecting to adjust the anchor to the proper side

// of a bidi jump depending on the visual position of the head.

function bidiSimplify(cm, range) {

  var anchor = range.anchor;

  var head = range.head;

  var anchorLine = getLine(cm.doc, anchor.line)

  if (cmp(anchor, head) == 0 && anchor.sticky == head.sticky) { return range }

  var order = getOrder(anchorLine)

  if (!order) { return range }

  var index = getBidiPartAt(order, anchor.ch, anchor.sticky), part = order[index]

  if (part.from != anchor.ch && part.to != anchor.ch) { return range }

  var boundary = index + ((part.from == anchor.ch) == (part.level != 1) ? 0 : 1)

  if (boundary == 0 || boundary == order.length) { return range }



  // Compute the relative visual position of the head compared to the

  // anchor (<0 is to the left, >0 to the right)

  var leftSide

  if (head.line != anchor.line) {

    leftSide = (head.line - anchor.line) * (cm.doc.direction == "ltr" ? 1 : -1) > 0

  } else {

    var headIndex = getBidiPartAt(order, head.ch, head.sticky)

    var dir = headIndex - index || (head.ch - anchor.ch) * (part.level == 1 ? -1 : 1)

    if (headIndex == boundary - 1 || headIndex == boundary)

      { leftSide = dir < 0 }

    else

      { leftSide = dir > 0 }

  }



  var usePart = order[boundary + (leftSide ? -1 : 0)]

  var from = leftSide == (usePart.level == 1)

  var ch = from ? usePart.from : usePart.to, sticky = from ? "after" : "before"

  return anchor.ch == ch && anchor.sticky == sticky ? range : new Range(new Pos(anchor.line, ch, sticky), head)

}





// Determines whether an event happened in the gutter, and fires the

// handlers for the corresponding event.

function gutterEvent(cm, e, type, prevent) {

  var mX, mY

  if (e.touches) {

    mX = e.touches[0].clientX

    mY = e.touches[0].clientY

  } else {

    try { mX = e.clientX; mY = e.clientY }

    catch(e) { return false }

  }

  if (mX >= Math.floor(cm.display.gutters.getBoundingClientRect().right)) { return false }

  if (prevent) { e_preventDefault(e) }



  var display = cm.display

  var lineBox = display.lineDiv.getBoundingClientRect()



  if (mY > lineBox.bottom || !hasHandler(cm, type)) { return e_defaultPrevented(e) }

  mY -= lineBox.top - display.viewOffset



  for (var i = 0; i < cm.options.gutters.length; ++i) {

    var g = display.gutters.childNodes[i]

    if (g && g.getBoundingClientRect().right >= mX) {

      var line = lineAtHeight(cm.doc, mY)

      var gutter = cm.options.gutters[i]

      signal(cm, type, cm, line, gutter, e)

      return e_defaultPrevented(e)

    }

  }

}



function clickInGutter(cm, e) {

  return gutterEvent(cm, e, "gutterClick", true)

}



// CONTEXT MENU HANDLING



// To make the context menu work, we need to briefly unhide the

// textarea (making it as unobtrusive as possible) to let the

// right-click take effect on it.

function onContextMenu(cm, e) {

  if (eventInWidget(cm.display, e) || contextMenuInGutter(cm, e)) { return }

  if (signalDOMEvent(cm, e, "contextmenu")) { return }

  cm.display.input.onContextMenu(e)

}



function contextMenuInGutter(cm, e) {

  if (!hasHandler(cm, "gutterContextMenu")) { return false }

  return gutterEvent(cm, e, "gutterContextMenu", false)

}



function themeChanged(cm) {

  cm.display.wrapper.className = cm.display.wrapper.className.replace(/\s*cm-s-\S+/g, "") +

    cm.options.theme.replace(/(^|\s)\s*/g, " cm-s-")

  clearCaches(cm)

}



var Init = {toString: function(){return "CodeMirror.Init"}}



var defaults = {}

var optionHandlers = {}



function defineOptions(CodeMirror) {

  var optionHandlers = CodeMirror.optionHandlers



  function option(name, deflt, handle, notOnInit) {

    CodeMirror.defaults[name] = deflt

    if (handle) { optionHandlers[name] =

      notOnInit ? function (cm, val, old) {if (old != Init) { handle(cm, val, old) }} : handle }

  }



  CodeMirror.defineOption = option



  // Passed to option handlers when there is no old value.

  CodeMirror.Init = Init



  // These two are, on init, called from the constructor because they

  // have to be initialized before the editor can start at all.

  option("value", "", function (cm, val) { return cm.setValue(val); }, true)

  option("mode", null, function (cm, val) {

    cm.doc.modeOption = val

    loadMode(cm)

  }, true)



  option("indentUnit", 2, loadMode, true)

  option("indentWithTabs", false)

  option("smartIndent", true)

  option("tabSize", 4, function (cm) {

    resetModeState(cm)

    clearCaches(cm)

    regChange(cm)

  }, true)



  option("lineSeparator", null, function (cm, val) {

    cm.doc.lineSep = val

    if (!val) { return }

    var newBreaks = [], lineNo = cm.doc.first

    cm.doc.iter(function (line) {

      for (var pos = 0;;) {

        var found = line.text.indexOf(val, pos)

        if (found == -1) { break }

        pos = found + val.length

        newBreaks.push(Pos(lineNo, found))

      }

      lineNo++

    })

    for (var i = newBreaks.length - 1; i >= 0; i--)

      { replaceRange(cm.doc, val, newBreaks[i], Pos(newBreaks[i].line, newBreaks[i].ch + val.length)) }

  })

  option("specialChars", /[\u0000-\u001f\u007f-\u009f\u00ad\u061c\u200b-\u200f\u2028\u2029\ufeff]/g, function (cm, val, old) {

    cm.state.specialChars = new RegExp(val.source + (val.test("\t") ? "" : "|\t"), "g")

    if (old != Init) { cm.refresh() }

  })

  option("specialCharPlaceholder", defaultSpecialCharPlaceholder, function (cm) { return cm.refresh(); }, true)

  option("electricChars", true)

  option("inputStyle", mobile ? "contenteditable" : "textarea", function () {

    throw new Error("inputStyle can not (yet) be changed in a running editor") // FIXME

  }, true)

  option("spellcheck", false, function (cm, val) { return cm.getInputField().spellcheck = val; }, true)

  option("rtlMoveVisually", !windows)

  option("wholeLineUpdateBefore", true)



  option("theme", "default", function (cm) {

    themeChanged(cm)

    guttersChanged(cm)

  }, true)

  option("keyMap", "default", function (cm, val, old) {

    var next = getKeyMap(val)

    var prev = old != Init && getKeyMap(old)

    if (prev && prev.detach) { prev.detach(cm, next) }

    if (next.attach) { next.attach(cm, prev || null) }

  })

  option("extraKeys", null)

  option("configureMouse", null)



  option("lineWrapping", false, wrappingChanged, true)

  option("gutters", [], function (cm) {

    setGuttersForLineNumbers(cm.options)

    guttersChanged(cm)

  }, true)

  option("fixedGutter", true, function (cm, val) {

    cm.display.gutters.style.left = val ? compensateForHScroll(cm.display) + "px" : "0"

    cm.refresh()

  }, true)

  option("coverGutterNextToScrollbar", false, function (cm) { return updateScrollbars(cm); }, true)

  option("scrollbarStyle", "native", function (cm) {

    initScrollbars(cm)

    updateScrollbars(cm)

    cm.display.scrollbars.setScrollTop(cm.doc.scrollTop)

    cm.display.scrollbars.setScrollLeft(cm.doc.scrollLeft)

  }, true)

  option("lineNumbers", false, function (cm) {

    setGuttersForLineNumbers(cm.options)

    guttersChanged(cm)

  }, true)

  option("firstLineNumber", 1, guttersChanged, true)

  option("lineNumberFormatter", function (integer) { return integer; }, guttersChanged, true)

  option("showCursorWhenSelecting", false, updateSelection, true)



  option("resetSelectionOnContextMenu", true)

  option("lineWiseCopyCut", true)

  option("pasteLinesPerSelection", true)



  option("readOnly", false, function (cm, val) {

    if (val == "nocursor") {

      onBlur(cm)

      cm.display.input.blur()

    }

    cm.display.input.readOnlyChanged(val)

  })

  option("disableInput", false, function (cm, val) {if (!val) { cm.display.input.reset() }}, true)

  option("dragDrop", true, dragDropChanged)

  option("allowDropFileTypes", null)



  option("cursorBlinkRate", 530)

  option("cursorScrollMargin", 0)

  option("cursorHeight", 1, updateSelection, true)

  option("singleCursorHeightPerLine", true, updateSelection, true)

  option("workTime", 100)

  option("workDelay", 100)

  option("flattenSpans", true, resetModeState, true)

  option("addModeClass", false, resetModeState, true)

  option("pollInterval", 100)

  option("undoDepth", 200, function (cm, val) { return cm.doc.history.undoDepth = val; })

  option("historyEventDelay", 1250)

  option("viewportMargin", 10, function (cm) { return cm.refresh(); }, true)

  option("maxHighlightLength", 10000, resetModeState, true)

  option("moveInputWithCursor", true, function (cm, val) {

    if (!val) { cm.display.input.resetPosition() }

  })



  option("tabindex", null, function (cm, val) { return cm.display.input.getField().tabIndex = val || ""; })

  option("autofocus", null)

  option("direction", "ltr", function (cm, val) { return cm.doc.setDirection(val); }, true)

}



function guttersChanged(cm) {

  updateGutters(cm)

  regChange(cm)

  alignHorizontally(cm)

}



function dragDropChanged(cm, value, old) {

  var wasOn = old && old != Init

  if (!value != !wasOn) {

    var funcs = cm.display.dragFunctions

    var toggle = value ? on : off

    toggle(cm.display.scroller, "dragstart", funcs.start)

    toggle(cm.display.scroller, "dragenter", funcs.enter)

    toggle(cm.display.scroller, "dragover", funcs.over)

    toggle(cm.display.scroller, "dragleave", funcs.leave)

    toggle(cm.display.scroller, "drop", funcs.drop)

  }

}



function wrappingChanged(cm) {

  if (cm.options.lineWrapping) {

    addClass(cm.display.wrapper, "CodeMirror-wrap")

    cm.display.sizer.style.minWidth = ""

    cm.display.sizerWidth = null

  } else {

    rmClass(cm.display.wrapper, "CodeMirror-wrap")

    findMaxLine(cm)

  }

  estimateLineHeights(cm)

  regChange(cm)

  clearCaches(cm)

  setTimeout(function () { return updateScrollbars(cm); }, 100)

}



// A CodeMirror instance represents an editor. This is the object

// that user code is usually dealing with.



function CodeMirror(place, options) {

  var this$1 = this;



  if (!(this instanceof CodeMirror)) { return new CodeMirror(place, options) }



  this.options = options = options ? copyObj(options) : {}

  // Determine effective options based on given values and defaults.

  copyObj(defaults, options, false)

  setGuttersForLineNumbers(options)



  var doc = options.value

  if (typeof doc == "string") { doc = new Doc(doc, options.mode, null, options.lineSeparator, options.direction) }

  this.doc = doc



  var input = new CodeMirror.inputStyles[options.inputStyle](this)

  var display = this.display = new Display(place, doc, input)

  display.wrapper.CodeMirror = this

  updateGutters(this)

  themeChanged(this)

  if (options.lineWrapping)

    { this.display.wrapper.className += " CodeMirror-wrap" }

  initScrollbars(this)



  this.state = {

    keyMaps: [],  // stores maps added by addKeyMap

    overlays: [], // highlighting overlays, as added by addOverlay

    modeGen: 0,   // bumped when mode/overlay changes, used to invalidate highlighting info

    overwrite: false,

    delayingBlurEvent: false,

    focused: false,

    suppressEdits: false, // used to disable editing during key handlers when in readOnly mode

    pasteIncoming: false, cutIncoming: false, // help recognize paste/cut edits in input.poll

    selectingText: false,

    draggingText: false,

    highlight: new Delayed(), // stores highlight worker timeout

    keySeq: null,  // Unfinished key sequence

    specialChars: null

  }



  if (options.autofocus && !mobile) { display.input.focus() }



  // Override magic textarea content restore that IE sometimes does

  // on our hidden textarea on reload

  if (ie && ie_version < 11) { setTimeout(function () { return this$1.display.input.reset(true); }, 20) }



  registerEventHandlers(this)

  ensureGlobalHandlers()



  startOperation(this)

  this.curOp.forceUpdate = true

  attachDoc(this, doc)



  if ((options.autofocus && !mobile) || this.hasFocus())

    { setTimeout(bind(onFocus, this), 20) }

  else

    { onBlur(this) }



  for (var opt in optionHandlers) { if (optionHandlers.hasOwnProperty(opt))

    { optionHandlers[opt](this$1, options[opt], Init) } }

  maybeUpdateLineNumberWidth(this)

  if (options.finishInit) { options.finishInit(this) }

  for (var i = 0; i < initHooks.length; ++i) { initHooks[i](this$1) }

  endOperation(this)

  // Suppress optimizelegibility in Webkit, since it breaks text

  // measuring on line wrapping boundaries.

  if (webkit && options.lineWrapping &&

      getComputedStyle(display.lineDiv).textRendering == "optimizelegibility")

    { display.lineDiv.style.textRendering = "auto" }

}



// The default configuration options.

CodeMirror.defaults = defaults

// Functions to run when options are changed.

CodeMirror.optionHandlers = optionHandlers



// Attach the necessary event handlers when initializing the editor

function registerEventHandlers(cm) {

  var d = cm.display

  on(d.scroller, "mousedown", operation(cm, onMouseDown))

  // Older IE's will not fire a second mousedown for a double click

  if (ie && ie_version < 11)

    { on(d.scroller, "dblclick", operation(cm, function (e) {

      if (signalDOMEvent(cm, e)) { return }

      var pos = posFromMouse(cm, e)

      if (!pos || clickInGutter(cm, e) || eventInWidget(cm.display, e)) { return }

      e_preventDefault(e)

      var word = cm.findWordAt(pos)

      extendSelection(cm.doc, word.anchor, word.head)

    })) }

  else

    { on(d.scroller, "dblclick", function (e) { return signalDOMEvent(cm, e) || e_preventDefault(e); }) }

  // Some browsers fire contextmenu *after* opening the menu, at

  // which point we can't mess with it anymore. Context menu is

  // handled in onMouseDown for these browsers.

  if (!captureRightClick) { on(d.scroller, "contextmenu", function (e) { return onContextMenu(cm, e); }) }



  // Used to suppress mouse event handling when a touch happens

  var touchFinished, prevTouch = {end: 0}

  function finishTouch() {

    if (d.activeTouch) {

      touchFinished = setTimeout(function () { return d.activeTouch = null; }, 1000)

      prevTouch = d.activeTouch

      prevTouch.end = +new Date

    }

  }

  function isMouseLikeTouchEvent(e) {

    if (e.touches.length != 1) { return false }

    var touch = e.touches[0]

    return touch.radiusX <= 1 && touch.radiusY <= 1

  }

  function farAway(touch, other) {

    if (other.left == null) { return true }

    var dx = other.left - touch.left, dy = other.top - touch.top

    return dx * dx + dy * dy > 20 * 20

  }

  on(d.scroller, "touchstart", function (e) {

    if (!signalDOMEvent(cm, e) && !isMouseLikeTouchEvent(e) && !clickInGutter(cm, e)) {

      d.input.ensurePolled()

      clearTimeout(touchFinished)

      var now = +new Date

      d.activeTouch = {start: now, moved: false,

                       prev: now - prevTouch.end <= 300 ? prevTouch : null}

      if (e.touches.length == 1) {

        d.activeTouch.left = e.touches[0].pageX

        d.activeTouch.top = e.touches[0].pageY

      }

    }

  })

  on(d.scroller, "touchmove", function () {

    if (d.activeTouch) { d.activeTouch.moved = true }

  })

  on(d.scroller, "touchend", function (e) {

    var touch = d.activeTouch

    if (touch && !eventInWidget(d, e) && touch.left != null &&

        !touch.moved && new Date - touch.start < 300) {

      var pos = cm.coordsChar(d.activeTouch, "page"), range

      if (!touch.prev || farAway(touch, touch.prev)) // Single tap

        { range = new Range(pos, pos) }

      else if (!touch.prev.prev || farAway(touch, touch.prev.prev)) // Double tap

        { range = cm.findWordAt(pos) }

      else // Triple tap

        { range = new Range(Pos(pos.line, 0), clipPos(cm.doc, Pos(pos.line + 1, 0))) }

      cm.setSelection(range.anchor, range.head)

      cm.focus()

      e_preventDefault(e)

    }

    finishTouch()

  })

  on(d.scroller, "touchcancel", finishTouch)



  // Sync scrolling between fake scrollbars and real scrollable

  // area, ensure viewport is updated when scrolling.

  on(d.scroller, "scroll", function () {

    if (d.scroller.clientHeight) {

      updateScrollTop(cm, d.scroller.scrollTop)

      setScrollLeft(cm, d.scroller.scrollLeft, true)

      signal(cm, "scroll", cm)

    }

  })



  // Listen to wheel events in order to try and update the viewport on time.

  on(d.scroller, "mousewheel", function (e) { return onScrollWheel(cm, e); })

  on(d.scroller, "DOMMouseScroll", function (e) { return onScrollWheel(cm, e); })



  // Prevent wrapper from ever scrolling

  on(d.wrapper, "scroll", function () { return d.wrapper.scrollTop = d.wrapper.scrollLeft = 0; })



  d.dragFunctions = {

    enter: function (e) {if (!signalDOMEvent(cm, e)) { e_stop(e) }},

    over: function (e) {if (!signalDOMEvent(cm, e)) { onDragOver(cm, e); e_stop(e) }},

    start: function (e) { return onDragStart(cm, e); },

    drop: operation(cm, onDrop),

    leave: function (e) {if (!signalDOMEvent(cm, e)) { clearDragCursor(cm) }}

  }



  var inp = d.input.getField()

  on(inp, "keyup", function (e) { return onKeyUp.call(cm, e); })

  on(inp, "keydown", operation(cm, onKeyDown))

  on(inp, "keypress", operation(cm, onKeyPress))

  on(inp, "focus", function (e) { return onFocus(cm, e); })

  on(inp, "blur", function (e) { return onBlur(cm, e); })

}



var initHooks = []

CodeMirror.defineInitHook = function (f) { return initHooks.push(f); }



// Indent the given line. The how parameter can be "smart",

// "add"/null, "subtract", or "prev". When aggressive is false

// (typically set to true for forced single-line indents), empty

// lines are not indented, and places where the mode returns Pass

// are left alone.

function indentLine(cm, n, how, aggressive) {

  var doc = cm.doc, state

  if (how == null) { how = "add" }

  if (how == "smart") {

    // Fall back to "prev" when the mode doesn't have an indentation

    // method.

    if (!doc.mode.indent) { how = "prev" }

    else { state = getContextBefore(cm, n).state }

  }



  var tabSize = cm.options.tabSize

  var line = getLine(doc, n), curSpace = countColumn(line.text, null, tabSize)

  if (line.stateAfter) { line.stateAfter = null }

  var curSpaceString = line.text.match(/^\s*/)[0], indentation

  if (!aggressive && !/\S/.test(line.text)) {

    indentation = 0

    how = "not"

  } else if (how == "smart") {

    indentation = doc.mode.indent(state, line.text.slice(curSpaceString.length), line.text)

    if (indentation == Pass || indentation > 150) {

      if (!aggressive) { return }

      how = "prev"

    }

  }

  if (how == "prev") {

    if (n > doc.first) { indentation = countColumn(getLine(doc, n-1).text, null, tabSize) }

    else { indentation = 0 }

  } else if (how == "add") {

    indentation = curSpace + cm.options.indentUnit

  } else if (how == "subtract") {

    indentation = curSpace - cm.options.indentUnit

  } else if (typeof how == "number") {

    indentation = curSpace + how

  }

  indentation = Math.max(0, indentation)



  var indentString = "", pos = 0

  if (cm.options.indentWithTabs)

    { for (var i = Math.floor(indentation / tabSize); i; --i) {pos += tabSize; indentString += "\t"} }

  if (pos < indentation) { indentString += spaceStr(indentation - pos) }



  if (indentString != curSpaceString) {

    replaceRange(doc, indentString, Pos(n, 0), Pos(n, curSpaceString.length), "+input")

    line.stateAfter = null

    return true

  } else {

    // Ensure that, if the cursor was in the whitespace at the start

    // of the line, it is moved to the end of that space.

    for (var i$1 = 0; i$1 < doc.sel.ranges.length; i$1++) {

      var range = doc.sel.ranges[i$1]

      if (range.head.line == n && range.head.ch < curSpaceString.length) {

        var pos$1 = Pos(n, curSpaceString.length)

        replaceOneSelection(doc, i$1, new Range(pos$1, pos$1))

        break

      }

    }

  }

}



// This will be set to a {lineWise: bool, text: [string]} object, so

// that, when pasting, we know what kind of selections the copied

// text was made out of.

var lastCopied = null



function setLastCopied(newLastCopied) {

  lastCopied = newLastCopied

}



function applyTextInput(cm, inserted, deleted, sel, origin) {

  var doc = cm.doc

  cm.display.shift = false

  if (!sel) { sel = doc.sel }



  var paste = cm.state.pasteIncoming || origin == "paste"

  var textLines = splitLinesAuto(inserted), multiPaste = null

  // When pasing N lines into N selections, insert one line per selection

  if (paste && sel.ranges.length > 1) {

    if (lastCopied && lastCopied.text.join("\n") == inserted) {

      if (sel.ranges.length % lastCopied.text.length == 0) {

        multiPaste = []

        for (var i = 0; i < lastCopied.text.length; i++)

          { multiPaste.push(doc.splitLines(lastCopied.text[i])) }

      }

    } else if (textLines.length == sel.ranges.length && cm.options.pasteLinesPerSelection) {

      multiPaste = map(textLines, function (l) { return [l]; })

    }

  }



  var updateInput

  // Normal behavior is to insert the new text into every selection

  for (var i$1 = sel.ranges.length - 1; i$1 >= 0; i$1--) {

    var range = sel.ranges[i$1]

    var from = range.from(), to = range.to()

    if (range.empty()) {

      if (deleted && deleted > 0) // Handle deletion

        { from = Pos(from.line, from.ch - deleted) }

      else if (cm.state.overwrite && !paste) // Handle overwrite

        { to = Pos(to.line, Math.min(getLine(doc, to.line).text.length, to.ch + lst(textLines).length)) }

      else if (lastCopied && lastCopied.lineWise && lastCopied.text.join("\n") == inserted)

        { from = to = Pos(from.line, 0) }

    }

    updateInput = cm.curOp.updateInput

    var changeEvent = {from: from, to: to, text: multiPaste ? multiPaste[i$1 % multiPaste.length] : textLines,

                       origin: origin || (paste ? "paste" : cm.state.cutIncoming ? "cut" : "+input")}

    makeChange(cm.doc, changeEvent)

    signalLater(cm, "inputRead", cm, changeEvent)

  }

  if (inserted && !paste)

    { triggerElectric(cm, inserted) }



  ensureCursorVisible(cm)

  cm.curOp.updateInput = updateInput

  cm.curOp.typing = true

  cm.state.pasteIncoming = cm.state.cutIncoming = false

}



function handlePaste(e, cm) {

  var pasted = e.clipboardData && e.clipboardData.getData("Text")

  if (pasted) {

    e.preventDefault()

    if (!cm.isReadOnly() && !cm.options.disableInput)

      { runInOp(cm, function () { return applyTextInput(cm, pasted, 0, null, "paste"); }) }

    return true

  }

}



function triggerElectric(cm, inserted) {

  // When an 'electric' character is inserted, immediately trigger a reindent

  if (!cm.options.electricChars || !cm.options.smartIndent) { return }

  var sel = cm.doc.sel



  for (var i = sel.ranges.length - 1; i >= 0; i--) {

    var range = sel.ranges[i]

    if (range.head.ch > 100 || (i && sel.ranges[i - 1].head.line == range.head.line)) { continue }

    var mode = cm.getModeAt(range.head)

    var indented = false

    if (mode.electricChars) {

      for (var j = 0; j < mode.electricChars.length; j++)

        { if (inserted.indexOf(mode.electricChars.charAt(j)) > -1) {

          indented = indentLine(cm, range.head.line, "smart")

          break

        } }

    } else if (mode.electricInput) {

      if (mode.electricInput.test(getLine(cm.doc, range.head.line).text.slice(0, range.head.ch)))

        { indented = indentLine(cm, range.head.line, "smart") }

    }

    if (indented) { signalLater(cm, "electricInput", cm, range.head.line) }

  }

}



function copyableRanges(cm) {

  var text = [], ranges = []

  for (var i = 0; i < cm.doc.sel.ranges.length; i++) {

    var line = cm.doc.sel.ranges[i].head.line

    var lineRange = {anchor: Pos(line, 0), head: Pos(line + 1, 0)}

    ranges.push(lineRange)

    text.push(cm.getRange(lineRange.anchor, lineRange.head))

  }

  return {text: text, ranges: ranges}

}



function disableBrowserMagic(field, spellcheck) {

  field.setAttribute("autocorrect", "off")

  field.setAttribute("autocapitalize", "off")

  field.setAttribute("spellcheck", !!spellcheck)

}



function hiddenTextarea() {

  var te = elt("textarea", null, null, "position: absolute; bottom: -1em; padding: 0; width: 1px; height: 1em; outline: none")

  var div = elt("div", [te], null, "overflow: hidden; position: relative; width: 3px; height: 0px;")

  // The textarea is kept positioned near the cursor to prevent the

  // fact that it'll be scrolled into view on input from scrolling

  // our fake cursor out of view. On webkit, when wrap=off, paste is

  // very slow. So make the area wide instead.

  if (webkit) { te.style.width = "1000px" }

  else { te.setAttribute("wrap", "off") }

  // If border: 0; -- iOS fails to open keyboard (issue #1287)

  if (ios) { te.style.border = "1px solid black" }

  disableBrowserMagic(te)

  return div

}



// The publicly visible API. Note that methodOp(f) means

// 'wrap f in an operation, performed on its `this` parameter'.



// This is not the complete set of editor methods. Most of the

// methods defined on the Doc type are also injected into

// CodeMirror.prototype, for backwards compatibility and

// convenience.



function addEditorMethods(CodeMirror) {

  var optionHandlers = CodeMirror.optionHandlers



  var helpers = CodeMirror.helpers = {}



  CodeMirror.prototype = {

    constructor: CodeMirror,

    focus: function(){window.focus(); this.display.input.focus()},



    setOption: function(option, value) {

      var options = this.options, old = options[option]

      if (options[option] == value && option != "mode") { return }

      options[option] = value

      if (optionHandlers.hasOwnProperty(option))

        { operation(this, optionHandlers[option])(this, value, old) }

      signal(this, "optionChange", this, option)

    },



    getOption: function(option) {return this.options[option]},

    getDoc: function() {return this.doc},



    addKeyMap: function(map, bottom) {

      this.state.keyMaps[bottom ? "push" : "unshift"](getKeyMap(map))

    },

    removeKeyMap: function(map) {

      var maps = this.state.keyMaps

      for (var i = 0; i < maps.length; ++i)

        { if (maps[i] == map || maps[i].name == map) {

          maps.splice(i, 1)

          return true

        } }

    },



    addOverlay: methodOp(function(spec, options) {

      var mode = spec.token ? spec : CodeMirror.getMode(this.options, spec)

      if (mode.startState) { throw new Error("Overlays may not be stateful.") }

      insertSorted(this.state.overlays,

                   {mode: mode, modeSpec: spec, opaque: options && options.opaque,

                    priority: (options && options.priority) || 0},

                   function (overlay) { return overlay.priority; })

      this.state.modeGen++

      regChange(this)

    }),

    removeOverlay: methodOp(function(spec) {

      var this$1 = this;



      var overlays = this.state.overlays

      for (var i = 0; i < overlays.length; ++i) {

        var cur = overlays[i].modeSpec

        if (cur == spec || typeof spec == "string" && cur.name == spec) {

          overlays.splice(i, 1)

          this$1.state.modeGen++

          regChange(this$1)

          return

        }

      }

    }),



    indentLine: methodOp(function(n, dir, aggressive) {

      if (typeof dir != "string" && typeof dir != "number") {

        if (dir == null) { dir = this.options.smartIndent ? "smart" : "prev" }

        else { dir = dir ? "add" : "subtract" }

      }

      if (isLine(this.doc, n)) { indentLine(this, n, dir, aggressive) }

    }),

    indentSelection: methodOp(function(how) {

      var this$1 = this;



      var ranges = this.doc.sel.ranges, end = -1

      for (var i = 0; i < ranges.length; i++) {

        var range = ranges[i]

        if (!range.empty()) {

          var from = range.from(), to = range.to()

          var start = Math.max(end, from.line)

          end = Math.min(this$1.lastLine(), to.line - (to.ch ? 0 : 1)) + 1

          for (var j = start; j < end; ++j)

            { indentLine(this$1, j, how) }

          var newRanges = this$1.doc.sel.ranges

          if (from.ch == 0 && ranges.length == newRanges.length && newRanges[i].from().ch > 0)

            { replaceOneSelection(this$1.doc, i, new Range(from, newRanges[i].to()), sel_dontScroll) }

        } else if (range.head.line > end) {

          indentLine(this$1, range.head.line, how, true)

          end = range.head.line

          if (i == this$1.doc.sel.primIndex) { ensureCursorVisible(this$1) }

        }

      }

    }),



    // Fetch the parser token for a given character. Useful for hacks

    // that want to inspect the mode state (say, for completion).

    getTokenAt: function(pos, precise) {

      return takeToken(this, pos, precise)

    },



    getLineTokens: function(line, precise) {

      return takeToken(this, Pos(line), precise, true)

    },



    getTokenTypeAt: function(pos) {

      pos = clipPos(this.doc, pos)

      var styles = getLineStyles(this, getLine(this.doc, pos.line))

      var before = 0, after = (styles.length - 1) / 2, ch = pos.ch

      var type

      if (ch == 0) { type = styles[2] }

      else { for (;;) {

        var mid = (before + after) >> 1

        if ((mid ? styles[mid * 2 - 1] : 0) >= ch) { after = mid }

        else if (styles[mid * 2 + 1] < ch) { before = mid + 1 }

        else { type = styles[mid * 2 + 2]; break }

      } }

      var cut = type ? type.indexOf("overlay ") : -1

      return cut < 0 ? type : cut == 0 ? null : type.slice(0, cut - 1)

    },



    getModeAt: function(pos) {

      var mode = this.doc.mode

      if (!mode.innerMode) { return mode }

      return CodeMirror.innerMode(mode, this.getTokenAt(pos).state).mode

    },



    getHelper: function(pos, type) {

      return this.getHelpers(pos, type)[0]

    },



    getHelpers: function(pos, type) {

      var this$1 = this;



      var found = []

      if (!helpers.hasOwnProperty(type)) { return found }

      var help = helpers[type], mode = this.getModeAt(pos)

      if (typeof mode[type] == "string") {

        if (help[mode[type]]) { found.push(help[mode[type]]) }

      } else if (mode[type]) {

        for (var i = 0; i < mode[type].length; i++) {

          var val = help[mode[type][i]]

          if (val) { found.push(val) }

        }

      } else if (mode.helperType && help[mode.helperType]) {

        found.push(help[mode.helperType])

      } else if (help[mode.name]) {

        found.push(help[mode.name])

      }

      for (var i$1 = 0; i$1 < help._global.length; i$1++) {

        var cur = help._global[i$1]

        if (cur.pred(mode, this$1) && indexOf(found, cur.val) == -1)

          { found.push(cur.val) }

      }

      return found

    },



    getStateAfter: function(line, precise) {

      var doc = this.doc

      line = clipLine(doc, line == null ? doc.first + doc.size - 1: line)

      return getContextBefore(this, line + 1, precise).state

    },



    cursorCoords: function(start, mode) {

      var pos, range = this.doc.sel.primary()

      if (start == null) { pos = range.head }

      else if (typeof start == "object") { pos = clipPos(this.doc, start) }

      else { pos = start ? range.from() : range.to() }

      return cursorCoords(this, pos, mode || "page")

    },



    charCoords: function(pos, mode) {

      return charCoords(this, clipPos(this.doc, pos), mode || "page")

    },



    coordsChar: function(coords, mode) {

      coords = fromCoordSystem(this, coords, mode || "page")

      return coordsChar(this, coords.left, coords.top)

    },



    lineAtHeight: function(height, mode) {

      height = fromCoordSystem(this, {top: height, left: 0}, mode || "page").top

      return lineAtHeight(this.doc, height + this.display.viewOffset)

    },

    heightAtLine: function(line, mode, includeWidgets) {

      var end = false, lineObj

      if (typeof line == "number") {

        var last = this.doc.first + this.doc.size - 1

        if (line < this.doc.first) { line = this.doc.first }

        else if (line > last) { line = last; end = true }

        lineObj = getLine(this.doc, line)

      } else {

        lineObj = line

      }

      return intoCoordSystem(this, lineObj, {top: 0, left: 0}, mode || "page", includeWidgets || end).top +

        (end ? this.doc.height - heightAtLine(lineObj) : 0)

    },



    defaultTextHeight: function() { return textHeight(this.display) },

    defaultCharWidth: function() { return charWidth(this.display) },



    getViewport: function() { return {from: this.display.viewFrom, to: this.display.viewTo}},



    addWidget: function(pos, node, scroll, vert, horiz) {

      var display = this.display

      pos = cursorCoords(this, clipPos(this.doc, pos))

      var top = pos.bottom, left = pos.left

      node.style.position = "absolute"

      node.setAttribute("cm-ignore-events", "true")

      this.display.input.setUneditable(node)

      display.sizer.appendChild(node)

      if (vert == "over") {

        top = pos.top

      } else if (vert == "above" || vert == "near") {

        var vspace = Math.max(display.wrapper.clientHeight, this.doc.height),

        hspace = Math.max(display.sizer.clientWidth, display.lineSpace.clientWidth)

        // Default to positioning above (if specified and possible); otherwise default to positioning below

        if ((vert == 'above' || pos.bottom + node.offsetHeight > vspace) && pos.top > node.offsetHeight)

          { top = pos.top - node.offsetHeight }

        else if (pos.bottom + node.offsetHeight <= vspace)

          { top = pos.bottom }

        if (left + node.offsetWidth > hspace)

          { left = hspace - node.offsetWidth }

      }

      node.style.top = top + "px"

      node.style.left = node.style.right = ""

      if (horiz == "right") {

        left = display.sizer.clientWidth - node.offsetWidth

        node.style.right = "0px"

      } else {

        if (horiz == "left") { left = 0 }

        else if (horiz == "middle") { left = (display.sizer.clientWidth - node.offsetWidth) / 2 }

        node.style.left = left + "px"

      }

      if (scroll)

        { scrollIntoView(this, {left: left, top: top, right: left + node.offsetWidth, bottom: top + node.offsetHeight}) }

    },



    triggerOnKeyDown: methodOp(onKeyDown),

    triggerOnKeyPress: methodOp(onKeyPress),

    triggerOnKeyUp: onKeyUp,

    triggerOnMouseDown: methodOp(onMouseDown),



    execCommand: function(cmd) {

      if (commands.hasOwnProperty(cmd))

        { return commands[cmd].call(null, this) }

    },



    triggerElectric: methodOp(function(text) { triggerElectric(this, text) }),



    findPosH: function(from, amount, unit, visually) {

      var this$1 = this;



      var dir = 1

      if (amount < 0) { dir = -1; amount = -amount }

      var cur = clipPos(this.doc, from)

      for (var i = 0; i < amount; ++i) {

        cur = findPosH(this$1.doc, cur, dir, unit, visually)

        if (cur.hitSide) { break }

      }

      return cur

    },



    moveH: methodOp(function(dir, unit) {

      var this$1 = this;



      this.extendSelectionsBy(function (range) {

        if (this$1.display.shift || this$1.doc.extend || range.empty())

          { return findPosH(this$1.doc, range.head, dir, unit, this$1.options.rtlMoveVisually) }

        else

          { return dir < 0 ? range.from() : range.to() }

      }, sel_move)

    }),



    deleteH: methodOp(function(dir, unit) {

      var sel = this.doc.sel, doc = this.doc

      if (sel.somethingSelected())

        { doc.replaceSelection("", null, "+delete") }

      else

        { deleteNearSelection(this, function (range) {

          var other = findPosH(doc, range.head, dir, unit, false)

          return dir < 0 ? {from: other, to: range.head} : {from: range.head, to: other}

        }) }

    }),



    findPosV: function(from, amount, unit, goalColumn) {

      var this$1 = this;



      var dir = 1, x = goalColumn

      if (amount < 0) { dir = -1; amount = -amount }

      var cur = clipPos(this.doc, from)

      for (var i = 0; i < amount; ++i) {

        var coords = cursorCoords(this$1, cur, "div")

        if (x == null) { x = coords.left }

        else { coords.left = x }

        cur = findPosV(this$1, coords, dir, unit)

        if (cur.hitSide) { break }

      }

      return cur

    },



    moveV: methodOp(function(dir, unit) {

      var this$1 = this;



      var doc = this.doc, goals = []

      var collapse = !this.display.shift && !doc.extend && doc.sel.somethingSelected()

      doc.extendSelectionsBy(function (range) {

        if (collapse)

          { return dir < 0 ? range.from() : range.to() }

        var headPos = cursorCoords(this$1, range.head, "div")

        if (range.goalColumn != null) { headPos.left = range.goalColumn }

        goals.push(headPos.left)

        var pos = findPosV(this$1, headPos, dir, unit)

        if (unit == "page" && range == doc.sel.primary())

          { addToScrollTop(this$1, charCoords(this$1, pos, "div").top - headPos.top) }

        return pos

      }, sel_move)

      if (goals.length) { for (var i = 0; i < doc.sel.ranges.length; i++)

        { doc.sel.ranges[i].goalColumn = goals[i] } }

    }),



    // Find the word at the given position (as returned by coordsChar).

    findWordAt: function(pos) {

      var doc = this.doc, line = getLine(doc, pos.line).text

      var start = pos.ch, end = pos.ch

      if (line) {

        var helper = this.getHelper(pos, "wordChars")

        if ((pos.sticky == "before" || end == line.length) && start) { --start; } else { ++end }

        var startChar = line.charAt(start)

        var check = isWordChar(startChar, helper)

          ? function (ch) { return isWordChar(ch, helper); }

          : /\s/.test(startChar) ? function (ch) { return /\s/.test(ch); }

          : function (ch) { return (!/\s/.test(ch) && !isWordChar(ch)); }

        while (start > 0 && check(line.charAt(start - 1))) { --start }

        while (end < line.length && check(line.charAt(end))) { ++end }

      }

      return new Range(Pos(pos.line, start), Pos(pos.line, end))

    },



    toggleOverwrite: function(value) {

      if (value != null && value == this.state.overwrite) { return }

      if (this.state.overwrite = !this.state.overwrite)

        { addClass(this.display.cursorDiv, "CodeMirror-overwrite") }

      else

        { rmClass(this.display.cursorDiv, "CodeMirror-overwrite") }



      signal(this, "overwriteToggle", this, this.state.overwrite)

    },

    hasFocus: function() { return this.display.input.getField() == activeElt() },

    isReadOnly: function() { return !!(this.options.readOnly || this.doc.cantEdit) },



    scrollTo: methodOp(function (x, y) { scrollToCoords(this, x, y) }),

    getScrollInfo: function() {

      var scroller = this.display.scroller

      return {left: scroller.scrollLeft, top: scroller.scrollTop,

              height: scroller.scrollHeight - scrollGap(this) - this.display.barHeight,

              width: scroller.scrollWidth - scrollGap(this) - this.display.barWidth,

              clientHeight: displayHeight(this), clientWidth: displayWidth(this)}

    },



    scrollIntoView: methodOp(function(range, margin) {

      if (range == null) {

        range = {from: this.doc.sel.primary().head, to: null}

        if (margin == null) { margin = this.options.cursorScrollMargin }

      } else if (typeof range == "number") {

        range = {from: Pos(range, 0), to: null}

      } else if (range.from == null) {

        range = {from: range, to: null}

      }

      if (!range.to) { range.to = range.from }

      range.margin = margin || 0



      if (range.from.line != null) {

        scrollToRange(this, range)

      } else {

        scrollToCoordsRange(this, range.from, range.to, range.margin)

      }

    }),



    setSize: methodOp(function(width, height) {

      var this$1 = this;



      var interpret = function (val) { return typeof val == "number" || /^\d+$/.test(String(val)) ? val + "px" : val; }

      if (width != null) { this.display.wrapper.style.width = interpret(width) }

      if (height != null) { this.display.wrapper.style.height = interpret(height) }

      if (this.options.lineWrapping) { clearLineMeasurementCache(this) }

      var lineNo = this.display.viewFrom

      this.doc.iter(lineNo, this.display.viewTo, function (line) {

        if (line.widgets) { for (var i = 0; i < line.widgets.length; i++)

          { if (line.widgets[i].noHScroll) { regLineChange(this$1, lineNo, "widget"); break } } }

        ++lineNo

      })

      this.curOp.forceUpdate = true

      signal(this, "refresh", this)

    }),



    operation: function(f){return runInOp(this, f)},

    startOperation: function(){return startOperation(this)},

    endOperation: function(){return endOperation(this)},



    refresh: methodOp(function() {

      var oldHeight = this.display.cachedTextHeight

      regChange(this)

      this.curOp.forceUpdate = true

      clearCaches(this)

      scrollToCoords(this, this.doc.scrollLeft, this.doc.scrollTop)

      updateGutterSpace(this)

      if (oldHeight == null || Math.abs(oldHeight - textHeight(this.display)) > .5)

        { estimateLineHeights(this) }

      signal(this, "refresh", this)

    }),



    swapDoc: methodOp(function(doc) {

      var old = this.doc

      old.cm = null

      attachDoc(this, doc)

      clearCaches(this)

      this.display.input.reset()

      scrollToCoords(this, doc.scrollLeft, doc.scrollTop)

      this.curOp.forceScroll = true

      signalLater(this, "swapDoc", this, old)

      return old

    }),



    getInputField: function(){return this.display.input.getField()},

    getWrapperElement: function(){return this.display.wrapper},

    getScrollerElement: function(){return this.display.scroller},

    getGutterElement: function(){return this.display.gutters}

  }

  eventMixin(CodeMirror)



  CodeMirror.registerHelper = function(type, name, value) {

    if (!helpers.hasOwnProperty(type)) { helpers[type] = CodeMirror[type] = {_global: []} }

    helpers[type][name] = value

  }

  CodeMirror.registerGlobalHelper = function(type, name, predicate, value) {

    CodeMirror.registerHelper(type, name, value)

    helpers[type]._global.push({pred: predicate, val: value})

  }

}



// Used for horizontal relative motion. Dir is -1 or 1 (left or

// right), unit can be "char", "column" (like char, but doesn't

// cross line boundaries), "word" (across next word), or "group" (to

// the start of next group of word or non-word-non-whitespace

// chars). The visually param controls whether, in right-to-left

// text, direction 1 means to move towards the next index in the

// string, or towards the character to the right of the current

// position. The resulting position will have a hitSide=true

// property if it reached the end of the document.

function findPosH(doc, pos, dir, unit, visually) {

  var oldPos = pos

  var origDir = dir

  var lineObj = getLine(doc, pos.line)

  function findNextLine() {

    var l = pos.line + dir

    if (l < doc.first || l >= doc.first + doc.size) { return false }

    pos = new Pos(l, pos.ch, pos.sticky)

    return lineObj = getLine(doc, l)

  }

  function moveOnce(boundToLine) {

    var next

    if (visually) {

      next = moveVisually(doc.cm, lineObj, pos, dir)

    } else {

      next = moveLogically(lineObj, pos, dir)

    }

    if (next == null) {

      if (!boundToLine && findNextLine())

        { pos = endOfLine(visually, doc.cm, lineObj, pos.line, dir) }

      else

        { return false }

    } else {

      pos = next

    }

    return true

  }



  if (unit == "char") {

    moveOnce()

  } else if (unit == "column") {

    moveOnce(true)

  } else if (unit == "word" || unit == "group") {

    var sawType = null, group = unit == "group"

    var helper = doc.cm && doc.cm.getHelper(pos, "wordChars")

    for (var first = true;; first = false) {

      if (dir < 0 && !moveOnce(!first)) { break }

      var cur = lineObj.text.charAt(pos.ch) || "\n"

      var type = isWordChar(cur, helper) ? "w"

        : group && cur == "\n" ? "n"

        : !group || /\s/.test(cur) ? null

        : "p"

      if (group && !first && !type) { type = "s" }

      if (sawType && sawType != type) {

        if (dir < 0) {dir = 1; moveOnce(); pos.sticky = "after"}

        break

      }



      if (type) { sawType = type }

      if (dir > 0 && !moveOnce(!first)) { break }

    }

  }

  var result = skipAtomic(doc, pos, oldPos, origDir, true)

  if (equalCursorPos(oldPos, result)) { result.hitSide = true }

  return result

}



// For relative vertical movement. Dir may be -1 or 1. Unit can be

// "page" or "line". The resulting position will have a hitSide=true

// property if it reached the end of the document.

function findPosV(cm, pos, dir, unit) {

  var doc = cm.doc, x = pos.left, y

  if (unit == "page") {

    var pageSize = Math.min(cm.display.wrapper.clientHeight, window.innerHeight || document.documentElement.clientHeight)

    var moveAmount = Math.max(pageSize - .5 * textHeight(cm.display), 3)

    y = (dir > 0 ? pos.bottom : pos.top) + dir * moveAmount



  } else if (unit == "line") {

    y = dir > 0 ? pos.bottom + 3 : pos.top - 3

  }

  var target

  for (;;) {

    target = coordsChar(cm, x, y)

    if (!target.outside) { break }

    if (dir < 0 ? y <= 0 : y >= doc.height) { target.hitSide = true; break }

    y += dir * 5

  }

  return target

}



// CONTENTEDITABLE INPUT STYLE



var ContentEditableInput = function(cm) {

  this.cm = cm

  this.lastAnchorNode = this.lastAnchorOffset = this.lastFocusNode = this.lastFocusOffset = null

  this.polling = new Delayed()

  this.composing = null

  this.gracePeriod = false

  this.readDOMTimeout = null

};



ContentEditableInput.prototype.init = function (display) {

    var this$1 = this;



  var input = this, cm = input.cm

  var div = input.div = display.lineDiv

  disableBrowserMagic(div, cm.options.spellcheck)



  on(div, "paste", function (e) {

    if (signalDOMEvent(cm, e) || handlePaste(e, cm)) { return }

    // IE doesn't fire input events, so we schedule a read for the pasted content in this way

    if (ie_version <= 11) { setTimeout(operation(cm, function () { return this$1.updateFromDOM(); }), 20) }

  })



  on(div, "compositionstart", function (e) {

    this$1.composing = {data: e.data, done: false}

  })

  on(div, "compositionupdate", function (e) {

    if (!this$1.composing) { this$1.composing = {data: e.data, done: false} }

  })

  on(div, "compositionend", function (e) {

    if (this$1.composing) {

      if (e.data != this$1.composing.data) { this$1.readFromDOMSoon() }

      this$1.composing.done = true

    }

  })



  on(div, "touchstart", function () { return input.forceCompositionEnd(); })



  on(div, "input", function () {

    if (!this$1.composing) { this$1.readFromDOMSoon() }

  })



  function onCopyCut(e) {

    if (signalDOMEvent(cm, e)) { return }

    if (cm.somethingSelected()) {

      setLastCopied({lineWise: false, text: cm.getSelections()})

      if (e.type == "cut") { cm.replaceSelection("", null, "cut") }

    } else if (!cm.options.lineWiseCopyCut) {

      return

    } else {

      var ranges = copyableRanges(cm)

      setLastCopied({lineWise: true, text: ranges.text})

      if (e.type == "cut") {

        cm.operation(function () {

          cm.setSelections(ranges.ranges, 0, sel_dontScroll)

          cm.replaceSelection("", null, "cut")

        })

      }

    }

    if (e.clipboardData) {

      e.clipboardData.clearData()

      var content = lastCopied.text.join("\n")

      // iOS exposes the clipboard API, but seems to discard content inserted into it

      e.clipboardData.setData("Text", content)

      if (e.clipboardData.getData("Text") == content) {

        e.preventDefault()

        return

      }

    }

    // Old-fashioned briefly-focus-a-textarea hack

    var kludge = hiddenTextarea(), te = kludge.firstChild

    cm.display.lineSpace.insertBefore(kludge, cm.display.lineSpace.firstChild)

    te.value = lastCopied.text.join("\n")

    var hadFocus = document.activeElement

    selectInput(te)

    setTimeout(function () {

      cm.display.lineSpace.removeChild(kludge)

      hadFocus.focus()

      if (hadFocus == div) { input.showPrimarySelection() }

    }, 50)

  }

  on(div, "copy", onCopyCut)

  on(div, "cut", onCopyCut)

};



ContentEditableInput.prototype.prepareSelection = function () {

  var result = prepareSelection(this.cm, false)

  result.focus = this.cm.state.focused

  return result

};



ContentEditableInput.prototype.showSelection = function (info, takeFocus) {

  if (!info || !this.cm.display.view.length) { return }

  if (info.focus || takeFocus) { this.showPrimarySelection() }

  this.showMultipleSelections(info)

};



ContentEditableInput.prototype.showPrimarySelection = function () {

  var sel = window.getSelection(), cm = this.cm, prim = cm.doc.sel.primary()

  var from = prim.from(), to = prim.to()



  if (cm.display.viewTo == cm.display.viewFrom || from.line >= cm.display.viewTo || to.line < cm.display.viewFrom) {

    sel.removeAllRanges()

    return

  }



  var curAnchor = domToPos(cm, sel.anchorNode, sel.anchorOffset)

  var curFocus = domToPos(cm, sel.focusNode, sel.focusOffset)

  if (curAnchor && !curAnchor.bad && curFocus && !curFocus.bad &&

      cmp(minPos(curAnchor, curFocus), from) == 0 &&

      cmp(maxPos(curAnchor, curFocus), to) == 0)

    { return }



  var view = cm.display.view

  var start = (from.line >= cm.display.viewFrom && posToDOM(cm, from)) ||

      {node: view[0].measure.map[2], offset: 0}

  var end = to.line < cm.display.viewTo && posToDOM(cm, to)

  if (!end) {

    var measure = view[view.length - 1].measure

    var map = measure.maps ? measure.maps[measure.maps.length - 1] : measure.map

    end = {node: map[map.length - 1], offset: map[map.length - 2] - map[map.length - 3]}

  }



  if (!start || !end) {

    sel.removeAllRanges()

    return

  }



  var old = sel.rangeCount && sel.getRangeAt(0), rng

  try { rng = range(start.node, start.offset, end.offset, end.node) }

  catch(e) {} // Our model of the DOM might be outdated, in which case the range we try to set can be impossible

  if (rng) {

    if (!gecko && cm.state.focused) {

      sel.collapse(start.node, start.offset)

      if (!rng.collapsed) {

        sel.removeAllRanges()

        sel.addRange(rng)

      }

    } else {

      sel.removeAllRanges()

      sel.addRange(rng)

    }

    if (old && sel.anchorNode == null) { sel.addRange(old) }

    else if (gecko) { this.startGracePeriod() }

  }

  this.rememberSelection()

};



ContentEditableInput.prototype.startGracePeriod = function () {

    var this$1 = this;



  clearTimeout(this.gracePeriod)

  this.gracePeriod = setTimeout(function () {

    this$1.gracePeriod = false

    if (this$1.selectionChanged())

      { this$1.cm.operation(function () { return this$1.cm.curOp.selectionChanged = true; }) }

  }, 20)

};



ContentEditableInput.prototype.showMultipleSelections = function (info) {

  removeChildrenAndAdd(this.cm.display.cursorDiv, info.cursors)

  removeChildrenAndAdd(this.cm.display.selectionDiv, info.selection)

};



ContentEditableInput.prototype.rememberSelection = function () {

  var sel = window.getSelection()

  this.lastAnchorNode = sel.anchorNode; this.lastAnchorOffset = sel.anchorOffset

  this.lastFocusNode = sel.focusNode; this.lastFocusOffset = sel.focusOffset

};



ContentEditableInput.prototype.selectionInEditor = function () {

  var sel = window.getSelection()

  if (!sel.rangeCount) { return false }

  var node = sel.getRangeAt(0).commonAncestorContainer

  return contains(this.div, node)

};



ContentEditableInput.prototype.focus = function () {

  if (this.cm.options.readOnly != "nocursor") {

    if (!this.selectionInEditor())

      { this.showSelection(this.prepareSelection(), true) }

    this.div.focus()

  }

};

ContentEditableInput.prototype.blur = function () { this.div.blur() };

ContentEditableInput.prototype.getField = function () { return this.div };



ContentEditableInput.prototype.supportsTouch = function () { return true };



ContentEditableInput.prototype.receivedFocus = function () {

  var input = this

  if (this.selectionInEditor())

    { this.pollSelection() }

  else

    { runInOp(this.cm, function () { return input.cm.curOp.selectionChanged = true; }) }



  function poll() {

    if (input.cm.state.focused) {

      input.pollSelection()

      input.polling.set(input.cm.options.pollInterval, poll)

    }

  }

  this.polling.set(this.cm.options.pollInterval, poll)

};



ContentEditableInput.prototype.selectionChanged = function () {

  var sel = window.getSelection()

  return sel.anchorNode != this.lastAnchorNode || sel.anchorOffset != this.lastAnchorOffset ||

    sel.focusNode != this.lastFocusNode || sel.focusOffset != this.lastFocusOffset

};



ContentEditableInput.prototype.pollSelection = function () {

  if (this.readDOMTimeout != null || this.gracePeriod || !this.selectionChanged()) { return }

  var sel = window.getSelection(), cm = this.cm

  // On Android Chrome (version 56, at least), backspacing into an

  // uneditable block element will put the cursor in that element,

  // and then, because it's not editable, hide the virtual keyboard.

  // Because Android doesn't allow us to actually detect backspace

  // presses in a sane way, this code checks for when that happens

  // and simulates a backspace press in this case.

  if (android && chrome && this.cm.options.gutters.length && isInGutter(sel.anchorNode)) {

    this.cm.triggerOnKeyDown({type: "keydown", keyCode: 8, preventDefault: Math.abs})

    this.blur()

    this.focus()

    return

  }

  if (this.composing) { return }

  this.rememberSelection()

  var anchor = domToPos(cm, sel.anchorNode, sel.anchorOffset)

  var head = domToPos(cm, sel.focusNode, sel.focusOffset)

  if (anchor && head) { runInOp(cm, function () {

    setSelection(cm.doc, simpleSelection(anchor, head), sel_dontScroll)

    if (anchor.bad || head.bad) { cm.curOp.selectionChanged = true }

  }) }

};



ContentEditableInput.prototype.pollContent = function () {

  if (this.readDOMTimeout != null) {

    clearTimeout(this.readDOMTimeout)

    this.readDOMTimeout = null

  }



  var cm = this.cm, display = cm.display, sel = cm.doc.sel.primary()

  var from = sel.from(), to = sel.to()

  if (from.ch == 0 && from.line > cm.firstLine())

    { from = Pos(from.line - 1, getLine(cm.doc, from.line - 1).length) }

  if (to.ch == getLine(cm.doc, to.line).text.length && to.line < cm.lastLine())

    { to = Pos(to.line + 1, 0) }

  if (from.line < display.viewFrom || to.line > display.viewTo - 1) { return false }



  var fromIndex, fromLine, fromNode

  if (from.line == display.viewFrom || (fromIndex = findViewIndex(cm, from.line)) == 0) {

    fromLine = lineNo(display.view[0].line)

    fromNode = display.view[0].node

  } else {

    fromLine = lineNo(display.view[fromIndex].line)

    fromNode = display.view[fromIndex - 1].node.nextSibling

  }

  var toIndex = findViewIndex(cm, to.line)

  var toLine, toNode

  if (toIndex == display.view.length - 1) {

    toLine = display.viewTo - 1

    toNode = display.lineDiv.lastChild

  } else {

    toLine = lineNo(display.view[toIndex + 1].line) - 1

    toNode = display.view[toIndex + 1].node.previousSibling

  }



  if (!fromNode) { return false }

  var newText = cm.doc.splitLines(domTextBetween(cm, fromNode, toNode, fromLine, toLine))

  var oldText = getBetween(cm.doc, Pos(fromLine, 0), Pos(toLine, getLine(cm.doc, toLine).text.length))

  while (newText.length > 1 && oldText.length > 1) {

    if (lst(newText) == lst(oldText)) { newText.pop(); oldText.pop(); toLine-- }

    else if (newText[0] == oldText[0]) { newText.shift(); oldText.shift(); fromLine++ }

    else { break }

  }



  var cutFront = 0, cutEnd = 0

  var newTop = newText[0], oldTop = oldText[0], maxCutFront = Math.min(newTop.length, oldTop.length)

  while (cutFront < maxCutFront && newTop.charCodeAt(cutFront) == oldTop.charCodeAt(cutFront))

    { ++cutFront }

  var newBot = lst(newText), oldBot = lst(oldText)

  var maxCutEnd = Math.min(newBot.length - (newText.length == 1 ? cutFront : 0),

                           oldBot.length - (oldText.length == 1 ? cutFront : 0))

  while (cutEnd < maxCutEnd &&

         newBot.charCodeAt(newBot.length - cutEnd - 1) == oldBot.charCodeAt(oldBot.length - cutEnd - 1))

    { ++cutEnd }

  // Try to move start of change to start of selection if ambiguous

  if (newText.length == 1 && oldText.length == 1 && fromLine == from.line) {

    while (cutFront && cutFront > from.ch &&

           newBot.charCodeAt(newBot.length - cutEnd - 1) == oldBot.charCodeAt(oldBot.length - cutEnd - 1)) {

      cutFront--

      cutEnd++

    }

  }



  newText[newText.length - 1] = newBot.slice(0, newBot.length - cutEnd).replace(/^\u200b+/, "")

  newText[0] = newText[0].slice(cutFront).replace(/\u200b+$/, "")



  var chFrom = Pos(fromLine, cutFront)

  var chTo = Pos(toLine, oldText.length ? lst(oldText).length - cutEnd : 0)

  if (newText.length > 1 || newText[0] || cmp(chFrom, chTo)) {

    replaceRange(cm.doc, newText, chFrom, chTo, "+input")

    return true

  }

};



ContentEditableInput.prototype.ensurePolled = function () {

  this.forceCompositionEnd()

};

ContentEditableInput.prototype.reset = function () {

  this.forceCompositionEnd()

};

ContentEditableInput.prototype.forceCompositionEnd = function () {

  if (!this.composing) { return }

  clearTimeout(this.readDOMTimeout)

  this.composing = null

  this.updateFromDOM()

  this.div.blur()

  this.div.focus()

};

ContentEditableInput.prototype.readFromDOMSoon = function () {

    var this$1 = this;



  if (this.readDOMTimeout != null) { return }

  this.readDOMTimeout = setTimeout(function () {

    this$1.readDOMTimeout = null

    if (this$1.composing) {

      if (this$1.composing.done) { this$1.composing = null }

      else { return }

    }

    this$1.updateFromDOM()

  }, 80)

};



ContentEditableInput.prototype.updateFromDOM = function () {

    var this$1 = this;



  if (this.cm.isReadOnly() || !this.pollContent())

    { runInOp(this.cm, function () { return regChange(this$1.cm); }) }

};



ContentEditableInput.prototype.setUneditable = function (node) {

  node.contentEditable = "false"

};



ContentEditableInput.prototype.onKeyPress = function (e) {

  if (e.charCode == 0) { return }

  e.preventDefault()

  if (!this.cm.isReadOnly())

    { operation(this.cm, applyTextInput)(this.cm, String.fromCharCode(e.charCode == null ? e.keyCode : e.charCode), 0) }

};



ContentEditableInput.prototype.readOnlyChanged = function (val) {

  this.div.contentEditable = String(val != "nocursor")

};



ContentEditableInput.prototype.onContextMenu = function () {};

ContentEditableInput.prototype.resetPosition = function () {};



ContentEditableInput.prototype.needsContentAttribute = true



function posToDOM(cm, pos) {

  var view = findViewForLine(cm, pos.line)

  if (!view || view.hidden) { return null }

  var line = getLine(cm.doc, pos.line)

  var info = mapFromLineView(view, line, pos.line)



  var order = getOrder(line, cm.doc.direction), side = "left"

  if (order) {

    var partPos = getBidiPartAt(order, pos.ch)

    side = partPos % 2 ? "right" : "left"

  }

  var result = nodeAndOffsetInLineMap(info.map, pos.ch, side)

  result.offset = result.collapse == "right" ? result.end : result.start

  return result

}



function isInGutter(node) {

  for (var scan = node; scan; scan = scan.parentNode)

    { if (/CodeMirror-gutter-wrapper/.test(scan.className)) { return true } }

  return false

}



function badPos(pos, bad) { if (bad) { pos.bad = true; } return pos }



function domTextBetween(cm, from, to, fromLine, toLine) {

  var text = "", closing = false, lineSep = cm.doc.lineSeparator()

  function recognizeMarker(id) { return function (marker) { return marker.id == id; } }

  function close() {

    if (closing) {

      text += lineSep

      closing = false

    }

  }

  function addText(str) {

    if (str) {

      close()

      text += str

    }

  }

  function walk(node) {

    if (node.nodeType == 1) {

      var cmText = node.getAttribute("cm-text")

      if (cmText != null) {

        addText(cmText || node.textContent.replace(/\u200b/g, ""))

        return

      }

      var markerID = node.getAttribute("cm-marker"), range

      if (markerID) {

        var found = cm.findMarks(Pos(fromLine, 0), Pos(toLine + 1, 0), recognizeMarker(+markerID))

        if (found.length && (range = found[0].find(0)))

          { addText(getBetween(cm.doc, range.from, range.to).join(lineSep)) }

        return

      }

      if (node.getAttribute("contenteditable") == "false") { return }

      var isBlock = /^(pre|div|p)$/i.test(node.nodeName)

      if (isBlock) { close() }

      for (var i = 0; i < node.childNodes.length; i++)

        { walk(node.childNodes[i]) }

      if (isBlock) { closing = true }

    } else if (node.nodeType == 3) {

      addText(node.nodeValue)

    }

  }

  for (;;) {

    walk(from)

    if (from == to) { break }

    from = from.nextSibling

  }

  return text

}



function domToPos(cm, node, offset) {

  var lineNode

  if (node == cm.display.lineDiv) {

    lineNode = cm.display.lineDiv.childNodes[offset]

    if (!lineNode) { return badPos(cm.clipPos(Pos(cm.display.viewTo - 1)), true) }

    node = null; offset = 0

  } else {

    for (lineNode = node;; lineNode = lineNode.parentNode) {

      if (!lineNode || lineNode == cm.display.lineDiv) { return null }

      if (lineNode.parentNode && lineNode.parentNode == cm.display.lineDiv) { break }

    }

  }

  for (var i = 0; i < cm.display.view.length; i++) {

    var lineView = cm.display.view[i]

    if (lineView.node == lineNode)

      { return locateNodeInLineView(lineView, node, offset) }

  }

}



function locateNodeInLineView(lineView, node, offset) {

  var wrapper = lineView.text.firstChild, bad = false

  if (!node || !contains(wrapper, node)) { return badPos(Pos(lineNo(lineView.line), 0), true) }

  if (node == wrapper) {

    bad = true

    node = wrapper.childNodes[offset]

    offset = 0

    if (!node) {

      var line = lineView.rest ? lst(lineView.rest) : lineView.line

      return badPos(Pos(lineNo(line), line.text.length), bad)

    }

  }



  var textNode = node.nodeType == 3 ? node : null, topNode = node

  if (!textNode && node.childNodes.length == 1 && node.firstChild.nodeType == 3) {

    textNode = node.firstChild

    if (offset) { offset = textNode.nodeValue.length }

  }

  while (topNode.parentNode != wrapper) { topNode = topNode.parentNode }

  var measure = lineView.measure, maps = measure.maps



  function find(textNode, topNode, offset) {

    for (var i = -1; i < (maps ? maps.length : 0); i++) {

      var map = i < 0 ? measure.map : maps[i]

      for (var j = 0; j < map.length; j += 3) {

        var curNode = map[j + 2]

        if (curNode == textNode || curNode == topNode) {

          var line = lineNo(i < 0 ? lineView.line : lineView.rest[i])

          var ch = map[j] + offset

          if (offset < 0 || curNode != textNode) { ch = map[j + (offset ? 1 : 0)] }

          return Pos(line, ch)

        }

      }

    }

  }

  var found = find(textNode, topNode, offset)

  if (found) { return badPos(found, bad) }



  // FIXME this is all really shaky. might handle the few cases it needs to handle, but likely to cause problems

  for (var after = topNode.nextSibling, dist = textNode ? textNode.nodeValue.length - offset : 0; after; after = after.nextSibling) {

    found = find(after, after.firstChild, 0)

    if (found)

      { return badPos(Pos(found.line, found.ch - dist), bad) }

    else

      { dist += after.textContent.length }

  }

  for (var before = topNode.previousSibling, dist$1 = offset; before; before = before.previousSibling) {

    found = find(before, before.firstChild, -1)

    if (found)

      { return badPos(Pos(found.line, found.ch + dist$1), bad) }

    else

      { dist$1 += before.textContent.length }

  }

}



// TEXTAREA INPUT STYLE



var TextareaInput = function(cm) {

  this.cm = cm

  // See input.poll and input.reset

  this.prevInput = ""



  // Flag that indicates whether we expect input to appear real soon

  // now (after some event like 'keypress' or 'input') and are

  // polling intensively.

  this.pollingFast = false

  // Self-resetting timeout for the poller

  this.polling = new Delayed()

  // Used to work around IE issue with selection being forgotten when focus moves away from textarea

  this.hasSelection = false

  this.composing = null

};



TextareaInput.prototype.init = function (display) {

    var this$1 = this;



  var input = this, cm = this.cm



  // Wraps and hides input textarea

  var div = this.wrapper = hiddenTextarea()

  // The semihidden textarea that is focused when the editor is

  // focused, and receives input.

  var te = this.textarea = div.firstChild

  display.wrapper.insertBefore(div, display.wrapper.firstChild)



  // Needed to hide big blue blinking cursor on Mobile Safari (doesn't seem to work in iOS 8 anymore)

  if (ios) { te.style.width = "0px" }



  on(te, "input", function () {

    if (ie && ie_version >= 9 && this$1.hasSelection) { this$1.hasSelection = null }

    input.poll()

  })



  on(te, "paste", function (e) {

    if (signalDOMEvent(cm, e) || handlePaste(e, cm)) { return }



    cm.state.pasteIncoming = true

    input.fastPoll()

  })



  function prepareCopyCut(e) {

    if (signalDOMEvent(cm, e)) { return }

    if (cm.somethingSelected()) {

      setLastCopied({lineWise: false, text: cm.getSelections()})

    } else if (!cm.options.lineWiseCopyCut) {

      return

    } else {

      var ranges = copyableRanges(cm)

      setLastCopied({lineWise: true, text: ranges.text})

      if (e.type == "cut") {

        cm.setSelections(ranges.ranges, null, sel_dontScroll)

      } else {

        input.prevInput = ""

        te.value = ranges.text.join("\n")

        selectInput(te)

      }

    }

    if (e.type == "cut") { cm.state.cutIncoming = true }

  }

  on(te, "cut", prepareCopyCut)

  on(te, "copy", prepareCopyCut)



  on(display.scroller, "paste", function (e) {

    if (eventInWidget(display, e) || signalDOMEvent(cm, e)) { return }

    cm.state.pasteIncoming = true

    input.focus()

  })



  // Prevent normal selection in the editor (we handle our own)

  on(display.lineSpace, "selectstart", function (e) {

    if (!eventInWidget(display, e)) { e_preventDefault(e) }

  })



  on(te, "compositionstart", function () {

    var start = cm.getCursor("from")

    if (input.composing) { input.composing.range.clear() }

    input.composing = {

      start: start,

      range: cm.markText(start, cm.getCursor("to"), {className: "CodeMirror-composing"})

    }

  })

  on(te, "compositionend", function () {

    if (input.composing) {

      input.poll()

      input.composing.range.clear()

      input.composing = null

    }

  })

};



TextareaInput.prototype.prepareSelection = function () {

  // Redraw the selection and/or cursor

  var cm = this.cm, display = cm.display, doc = cm.doc

  var result = prepareSelection(cm)



  // Move the hidden textarea near the cursor to prevent scrolling artifacts

  if (cm.options.moveInputWithCursor) {

    var headPos = cursorCoords(cm, doc.sel.primary().head, "div")

    var wrapOff = display.wrapper.getBoundingClientRect(), lineOff = display.lineDiv.getBoundingClientRect()

    result.teTop = Math.max(0, Math.min(display.wrapper.clientHeight - 10,

                                        headPos.top + lineOff.top - wrapOff.top))

    result.teLeft = Math.max(0, Math.min(display.wrapper.clientWidth - 10,

                                         headPos.left + lineOff.left - wrapOff.left))

  }



  return result

};



TextareaInput.prototype.showSelection = function (drawn) {

  var cm = this.cm, display = cm.display

  removeChildrenAndAdd(display.cursorDiv, drawn.cursors)

  removeChildrenAndAdd(display.selectionDiv, drawn.selection)

  if (drawn.teTop != null) {

    this.wrapper.style.top = drawn.teTop + "px"

    this.wrapper.style.left = drawn.teLeft + "px"

  }

};



// Reset the input to correspond to the selection (or to be empty,

// when not typing and nothing is selected)

TextareaInput.prototype.reset = function (typing) {

  if (this.contextMenuPending || this.composing) { return }

  var cm = this.cm

  if (cm.somethingSelected()) {

    this.prevInput = ""

    var content = cm.getSelection()

    this.textarea.value = content

    if (cm.state.focused) { selectInput(this.textarea) }

    if (ie && ie_version >= 9) { this.hasSelection = content }

  } else if (!typing) {

    this.prevInput = this.textarea.value = ""

    if (ie && ie_version >= 9) { this.hasSelection = null }

  }

};



TextareaInput.prototype.getField = function () { return this.textarea };



TextareaInput.prototype.supportsTouch = function () { return false };



TextareaInput.prototype.focus = function () {

  if (this.cm.options.readOnly != "nocursor" && (!mobile || activeElt() != this.textarea)) {

    try { this.textarea.focus() }

    catch (e) {} // IE8 will throw if the textarea is display: none or not in DOM

  }

};



TextareaInput.prototype.blur = function () { this.textarea.blur() };



TextareaInput.prototype.resetPosition = function () {

  this.wrapper.style.top = this.wrapper.style.left = 0

};



TextareaInput.prototype.receivedFocus = function () { this.slowPoll() };



// Poll for input changes, using the normal rate of polling. This

// runs as long as the editor is focused.

TextareaInput.prototype.slowPoll = function () {

    var this$1 = this;



  if (this.pollingFast) { return }

  this.polling.set(this.cm.options.pollInterval, function () {

    this$1.poll()

    if (this$1.cm.state.focused) { this$1.slowPoll() }

  })

};



// When an event has just come in that is likely to add or change

// something in the input textarea, we poll faster, to ensure that

// the change appears on the screen quickly.

TextareaInput.prototype.fastPoll = function () {

  var missed = false, input = this

  input.pollingFast = true

  function p() {

    var changed = input.poll()

    if (!changed && !missed) {missed = true; input.polling.set(60, p)}

    else {input.pollingFast = false; input.slowPoll()}

  }

  input.polling.set(20, p)

};



// Read input from the textarea, and update the document to match.

// When something is selected, it is present in the textarea, and

// selected (unless it is huge, in which case a placeholder is

// used). When nothing is selected, the cursor sits after previously

// seen text (can be empty), which is stored in prevInput (we must

// not reset the textarea when typing, because that breaks IME).

TextareaInput.prototype.poll = function () {

    var this$1 = this;



  var cm = this.cm, input = this.textarea, prevInput = this.prevInput

  // Since this is called a *lot*, try to bail out as cheaply as

  // possible when it is clear that nothing happened. hasSelection

  // will be the case when there is a lot of text in the textarea,

  // in which case reading its value would be expensive.

  if (this.contextMenuPending || !cm.state.focused ||

      (hasSelection(input) && !prevInput && !this.composing) ||

      cm.isReadOnly() || cm.options.disableInput || cm.state.keySeq)

    { return false }



  var text = input.value

  // If nothing changed, bail.

  if (text == prevInput && !cm.somethingSelected()) { return false }

  // Work around nonsensical selection resetting in IE9/10, and

  // inexplicable appearance of private area unicode characters on

  // some key combos in Mac (#2689).

  if (ie && ie_version >= 9 && this.hasSelection === text ||

      mac && /[\uf700-\uf7ff]/.test(text)) {

    cm.display.input.reset()

    return false

  }



  if (cm.doc.sel == cm.display.selForContextMenu) {

    var first = text.charCodeAt(0)

    if (first == 0x200b && !prevInput) { prevInput = "\u200b" }

    if (first == 0x21da) { this.reset(); return this.cm.execCommand("undo") }

  }

  // Find the part of the input that is actually new

  var same = 0, l = Math.min(prevInput.length, text.length)

  while (same < l && prevInput.charCodeAt(same) == text.charCodeAt(same)) { ++same }



  runInOp(cm, function () {

    applyTextInput(cm, text.slice(same), prevInput.length - same,

                   null, this$1.composing ? "*compose" : null)



    // Don't leave long text in the textarea, since it makes further polling slow

    if (text.length > 1000 || text.indexOf("\n") > -1) { input.value = this$1.prevInput = "" }

    else { this$1.prevInput = text }



    if (this$1.composing) {

      this$1.composing.range.clear()

      this$1.composing.range = cm.markText(this$1.composing.start, cm.getCursor("to"),

                                         {className: "CodeMirror-composing"})

    }

  })

  return true

};



TextareaInput.prototype.ensurePolled = function () {

  if (this.pollingFast && this.poll()) { this.pollingFast = false }

};



TextareaInput.prototype.onKeyPress = function () {

  if (ie && ie_version >= 9) { this.hasSelection = null }

  this.fastPoll()

};



TextareaInput.prototype.onContextMenu = function (e) {

  var input = this, cm = input.cm, display = cm.display, te = input.textarea

  var pos = posFromMouse(cm, e), scrollPos = display.scroller.scrollTop

  if (!pos || presto) { return } // Opera is difficult.



  // Reset the current text selection only if the click is done outside of the selection

  // and 'resetSelectionOnContextMenu' option is true.

  var reset = cm.options.resetSelectionOnContextMenu

  if (reset && cm.doc.sel.contains(pos) == -1)

    { operation(cm, setSelection)(cm.doc, simpleSelection(pos), sel_dontScroll) }



  var oldCSS = te.style.cssText, oldWrapperCSS = input.wrapper.style.cssText

  input.wrapper.style.cssText = "position: absolute"

  var wrapperBox = input.wrapper.getBoundingClientRect()

  te.style.cssText = "position: absolute; width: 30px; height: 30px;\n      top: " + (e.clientY - wrapperBox.top - 5) + "px; left: " + (e.clientX - wrapperBox.left - 5) + "px;\n      z-index: 1000; background: " + (ie ? "rgba(255, 255, 255, .05)" : "transparent") + ";\n      outline: none; border-width: 0; outline: none; overflow: hidden; opacity: .05; filter: alpha(opacity=5);"

  var oldScrollY

  if (webkit) { oldScrollY = window.scrollY } // Work around Chrome issue (#2712)

  display.input.focus()

  if (webkit) { window.scrollTo(null, oldScrollY) }

  display.input.reset()

  // Adds "Select all" to context menu in FF

  if (!cm.somethingSelected()) { te.value = input.prevInput = " " }

  input.contextMenuPending = true

  display.selForContextMenu = cm.doc.sel

  clearTimeout(display.detectingSelectAll)



  // Select-all will be greyed out if there's nothing to select, so

  // this adds a zero-width space so that we can later check whether

  // it got selected.

  function prepareSelectAllHack() {

    if (te.selectionStart != null) {

      var selected = cm.somethingSelected()

      var extval = "\u200b" + (selected ? te.value : "")

      te.value = "\u21da" // Used to catch context-menu undo

      te.value = extval

      input.prevInput = selected ? "" : "\u200b"

      te.selectionStart = 1; te.selectionEnd = extval.length

      // Re-set this, in case some other handler touched the

      // selection in the meantime.

      display.selForContextMenu = cm.doc.sel

    }

  }

  function rehide() {

    input.contextMenuPending = false

    input.wrapper.style.cssText = oldWrapperCSS

    te.style.cssText = oldCSS

    if (ie && ie_version < 9) { display.scrollbars.setScrollTop(display.scroller.scrollTop = scrollPos) }



    // Try to detect the user choosing select-all

    if (te.selectionStart != null) {

      if (!ie || (ie && ie_version < 9)) { prepareSelectAllHack() }

      var i = 0, poll = function () {

        if (display.selForContextMenu == cm.doc.sel && te.selectionStart == 0 &&

            te.selectionEnd > 0 && input.prevInput == "\u200b") {

          operation(cm, selectAll)(cm)

        } else if (i++ < 10) {

          display.detectingSelectAll = setTimeout(poll, 500)

        } else {

          display.selForContextMenu = null

          display.input.reset()

        }

      }

      display.detectingSelectAll = setTimeout(poll, 200)

    }

  }



  if (ie && ie_version >= 9) { prepareSelectAllHack() }

  if (captureRightClick) {

    e_stop(e)

    var mouseup = function () {

      off(window, "mouseup", mouseup)

      setTimeout(rehide, 20)

    }

    on(window, "mouseup", mouseup)

  } else {

    setTimeout(rehide, 50)

  }

};



TextareaInput.prototype.readOnlyChanged = function (val) {

  if (!val) { this.reset() }

  this.textarea.disabled = val == "nocursor"

};



TextareaInput.prototype.setUneditable = function () {};



TextareaInput.prototype.needsContentAttribute = false



function fromTextArea(textarea, options) {

  options = options ? copyObj(options) : {}

  options.value = textarea.value

  if (!options.tabindex && textarea.tabIndex)

    { options.tabindex = textarea.tabIndex }

  if (!options.placeholder && textarea.placeholder)

    { options.placeholder = textarea.placeholder }

  // Set autofocus to true if this textarea is focused, or if it has

  // autofocus and no other element is focused.

  if (options.autofocus == null) {

    var hasFocus = activeElt()

    options.autofocus = hasFocus == textarea ||

      textarea.getAttribute("autofocus") != null && hasFocus == document.body

  }



  function save() {textarea.value = cm.getValue()}



  var realSubmit

  if (textarea.form) {

    on(textarea.form, "submit", save)

    // Deplorable hack to make the submit method do the right thing.

    if (!options.leaveSubmitMethodAlone) {

      var form = textarea.form

      realSubmit = form.submit

      try {

        var wrappedSubmit = form.submit = function () {

          save()

          form.submit = realSubmit

          form.submit()

          form.submit = wrappedSubmit

        }

      } catch(e) {}

    }

  }



  options.finishInit = function (cm) {

    cm.save = save

    cm.getTextArea = function () { return textarea; }

    cm.toTextArea = function () {

      cm.toTextArea = isNaN // Prevent this from being ran twice

      save()

      textarea.parentNode.removeChild(cm.getWrapperElement())

      textarea.style.display = ""

      if (textarea.form) {

        off(textarea.form, "submit", save)

        if (typeof textarea.form.submit == "function")

          { textarea.form.submit = realSubmit }

      }

    }

  }



  textarea.style.display = "none"

  var cm = CodeMirror(function (node) { return textarea.parentNode.insertBefore(node, textarea.nextSibling); },

    options)

  return cm

}



function addLegacyProps(CodeMirror) {

  CodeMirror.off = off

  CodeMirror.on = on

  CodeMirror.wheelEventPixels = wheelEventPixels

  CodeMirror.Doc = Doc

  CodeMirror.splitLines = splitLinesAuto

  CodeMirror.countColumn = countColumn

  CodeMirror.findColumn = findColumn

  CodeMirror.isWordChar = isWordCharBasic

  CodeMirror.Pass = Pass

  CodeMirror.signal = signal

  CodeMirror.Line = Line

  CodeMirror.changeEnd = changeEnd

  CodeMirror.scrollbarModel = scrollbarModel

  CodeMirror.Pos = Pos

  CodeMirror.cmpPos = cmp

  CodeMirror.modes = modes

  CodeMirror.mimeModes = mimeModes

  CodeMirror.resolveMode = resolveMode

  CodeMirror.getMode = getMode

  CodeMirror.modeExtensions = modeExtensions

  CodeMirror.extendMode = extendMode

  CodeMirror.copyState = copyState

  CodeMirror.startState = startState

  CodeMirror.innerMode = innerMode

  CodeMirror.commands = commands

  CodeMirror.keyMap = keyMap

  CodeMirror.keyName = keyName

  CodeMirror.isModifierKey = isModifierKey

  CodeMirror.lookupKey = lookupKey

  CodeMirror.normalizeKeyMap = normalizeKeyMap

  CodeMirror.StringStream = StringStream

  CodeMirror.SharedTextMarker = SharedTextMarker

  CodeMirror.TextMarker = TextMarker

  CodeMirror.LineWidget = LineWidget

  CodeMirror.e_preventDefault = e_preventDefault

  CodeMirror.e_stopPropagation = e_stopPropagation

  CodeMirror.e_stop = e_stop

  CodeMirror.addClass = addClass

  CodeMirror.contains = contains

  CodeMirror.rmClass = rmClass

  CodeMirror.keyNames = keyNames

}



// EDITOR CONSTRUCTOR



defineOptions(CodeMirror)



addEditorMethods(CodeMirror)



// Set up methods on CodeMirror's prototype to redirect to the editor's document.

var dontDelegate = "iter insert remove copy getEditor constructor".split(" ")

for (var prop in Doc.prototype) { if (Doc.prototype.hasOwnProperty(prop) && indexOf(dontDelegate, prop) < 0)

  { CodeMirror.prototype[prop] = (function(method) {

    return function() {return method.apply(this.doc, arguments)}

  })(Doc.prototype[prop]) } }



eventMixin(Doc)



// INPUT HANDLING



CodeMirror.inputStyles = {"textarea": TextareaInput, "contenteditable": ContentEditableInput}



// MODE DEFINITION AND QUERYING



// Extra arguments are stored as the mode's dependencies, which is

// used by (legacy) mechanisms like loadmode.js to automatically

// load a mode. (Preferred mechanism is the require/define calls.)

CodeMirror.defineMode = function(name/*, mode, …*/) {

  if (!CodeMirror.defaults.mode && name != "null") { CodeMirror.defaults.mode = name }

  defineMode.apply(this, arguments)

}



CodeMirror.defineMIME = defineMIME



// Minimal default mode.

CodeMirror.defineMode("null", function () { return ({token: function (stream) { return stream.skipToEnd(); }}); })

CodeMirror.defineMIME("text/plain", "null")



// EXTENSIONS



CodeMirror.defineExtension = function (name, func) {

  CodeMirror.prototype[name] = func

}

CodeMirror.defineDocExtension = function (name, func) {

  Doc.prototype[name] = func

}



CodeMirror.fromTextArea = fromTextArea



addLegacyProps(CodeMirror)



CodeMirror.version = "5.33.0"



return CodeMirror;



})));