text: /* ***** BEGIN LICENSE BLOCK *****
   * Distributed under the BSD license:
   *
   * Copyright (c) 2010, Ajax.org B.V.
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are met:
   *     * Redistributions of source code must retain the above copyright
   *       notice, this list of conditions and the following disclaimer.
   *     * Redistributions in binary form must reproduce the above copyright
   *       notice, this list of conditions and the following disclaimer in the
   *       documentation and/or other materials provided with the distribution.
   *     * Neither the name of Ajax.org B.V. nor the
   *       names of its contributors may be used to endorse or promote products
   *       derived from this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED. IN NO EVENT SHALL AJAX.ORG B.V. BE LIABLE FOR ANY
   * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   *
   * ***** END LICENSE BLOCK ***** */
  
  define(function(require, exports, module) {
  "use strict";
  
  var oop = require("./lib/oop");
  var lang = require("./lib/lang");
  var BidiHandler = require("./bidihandler").BidiHandler;
  var config = require("./config");
  var EventEmitter = require("./lib/event_emitter").EventEmitter;
  var Selection = require("./selection").Selection;
  var TextMode = require("./mode/text").Mode;
  var Range = require("./range").Range;
  var Document = require("./document").Document;
  var BackgroundTokenizer = require("./background_tokenizer").BackgroundTokenizer;
  var SearchHighlight = require("./search_highlight").SearchHighlight;
  
  /**
   * Stores all the data about [[Editor `Editor`]] state providing easy way to change editors state.
   *
   * `EditSession` can be attached to only one [[Document `Document`]]. Same `Document` can be attached to several `EditSession`s.
   * @class EditSession
   **/
  
  //{ events
  /**
   *
   * Emitted when the document changes.
   * @event change
   * @param {Object} e An object containing a `delta` of information about the change.
   **/
  /**
   * Emitted when the tab size changes, via [[EditSession.setTabSize]].
   *
   * @event changeTabSize
   **/
  /**
   * Emitted when the ability to overwrite text changes, via [[EditSession.setOverwrite]].
   *
   * @event changeOverwrite
   **/
  /**
   * Emitted when the gutter changes, either by setting or removing breakpoints, or when the gutter decorations change.
   *
   * @event changeBreakpoint
   **/
  /**
   * Emitted when a front marker changes.
   *
   * @event changeFrontMarker
   **/
  /**
   * Emitted when a back marker changes.
   *
   * @event changeBackMarker
   **/
  /**
   * Emitted when an annotation changes, like through [[EditSession.setAnnotations]].
   *
   * @event changeAnnotation
   **/
  /**
   * Emitted when a background tokenizer asynchronously processes new rows.
   * @event tokenizerUpdate
   *
   * @param {Object} e An object containing one property, `"data"`, that contains information about the changing rows
   *
   **/
  /**
   * Emitted when the current mode changes.
   *
   * @event changeMode
   *
   **/
  /**
   * Emitted when the wrap mode changes.
   *
   * @event changeWrapMode
   *
   **/
  /**
   * Emitted when the wrapping limit changes.
   *
   * @event changeWrapLimit
   *
   **/
  /**
   * Emitted when a code fold is added or removed.
   *
   * @event changeFold
   *
   **/
   /**
   * Emitted when the scroll top changes.
   * @event changeScrollTop
   *
   * @param {Number} scrollTop The new scroll top value
   **/
  /**
   * Emitted when the scroll left changes.
   * @event changeScrollLeft
   *
   * @param {Number} scrollLeft The new scroll left value
   **/
  //}
  
  /**
   * Sets up a new `EditSession` and associates it with the given `Document` and `TextMode`.
   * @param {Document | String} text [If `text` is a `Document`, it associates the `EditSession` with it. Otherwise, a new `Document` is created, with the initial text]{: #textParam}
   * @param {TextMode} mode [The initial language mode to use for the document]{: #modeParam}
   *
   * @constructor
   **/
  
  var EditSession = function(text, mode) {
      this.$breakpoints = [];
      this.$decorations = [];
      this.$frontMarkers = {};
      this.$backMarkers = {};
      this.$markerId = 1;
      this.$undoSelect = true;
  
      this.$foldData = [];
      this.id = "session" + (++EditSession.$uid);
      this.$foldData.toString = function() {
          return this.join("\n");
      };
      this.on("changeFold", this.onChangeFold.bind(this));
      this.$onChange = this.onChange.bind(this);
  
      if (typeof text != "object" || !text.getLine)
          text = new Document(text);
  
      this.setDocument(text);
      this.selection = new Selection(this);
      this.$bidiHandler = new BidiHandler(this);
  
      config.resetOptions(this);
      this.setMode(mode);
      config._signal("session", this);
  };
  
  
  EditSession.$uid = 0;
  
  (function() {
  
      oop.implement(this, EventEmitter);
  
      /**
       * Sets the `EditSession` to point to a new `Document`. If a `BackgroundTokenizer` exists, it also points to `doc`.
       *
       * @param {Document} doc The new `Document` to use
       *
       **/
      this.setDocument = function(doc) {
          if (this.doc)
              this.doc.removeListener("change", this.$onChange);
  
          this.doc = doc;
          doc.on("change", this.$onChange);
  
          if (this.bgTokenizer)
              this.bgTokenizer.setDocument(this.getDocument());
  
          this.resetCaches();
      };
  
      /**
       * Returns the `Document` associated with this session.
       * @return {Document}
       **/
      this.getDocument = function() {
          return this.doc;
      };
  
      /**
       * @param {Number} row The row to work with
       *
       **/
      this.$resetRowCache = function(docRow) {
          if (!docRow) {
              this.$docRowCache = [];
              this.$screenRowCache = [];
              return;
          }
          var l = this.$docRowCache.length;
          var i = this.$getRowCacheIndex(this.$docRowCache, docRow) + 1;
          if (l > i) {
              this.$docRowCache.splice(i, l);
              this.$screenRowCache.splice(i, l);
          }
      };
  
      this.$getRowCacheIndex = function(cacheArray, val) {
          var low = 0;
          var hi = cacheArray.length - 1;
  
          while (low <= hi) {
              var mid = (low + hi) >> 1;
              var c = cacheArray[mid];
  
              if (val > c)
                  low = mid + 1;
              else if (val < c)
                  hi = mid - 1;
              else
                  return mid;
          }
  
          return low -1;
      };
  
      this.resetCaches = function() {
          this.$modified = true;
          this.$wrapData = [];
          this.$rowLengthCache = [];
          this.$resetRowCache(0);
          if (this.bgTokenizer)
              this.bgTokenizer.start(0);
      };
  
      this.onChangeFold = function(e) {
          var fold = e.data;
          this.$resetRowCache(fold.start.row);
      };
  
      this.onChange = function(delta) {
          this.$modified = true;
          this.$bidiHandler.onChange(delta);
          this.$resetRowCache(delta.start.row);
  
          var removedFolds = this.$updateInternalDataOnChange(delta);
          if (!this.$fromUndo && this.$undoManager) {
              if (removedFolds && removedFolds.length) {
                  this.$undoManager.add({
                      action: "removeFolds",
                      folds:  removedFolds
                  }, this.mergeUndoDeltas);
                  this.mergeUndoDeltas = true;
              }
              this.$undoManager.add(delta, this.mergeUndoDeltas);
              this.mergeUndoDeltas = true;
              
              this.$informUndoManager.schedule();
          }
  
          this.bgTokenizer && this.bgTokenizer.$updateOnChange(delta);
          this._signal("change", delta);
      };
  
      /**
       * Sets the session text.
       * @param {String} text The new text to place
       *
       **/
      this.setValue = function(text) {
          this.doc.setValue(text);
          this.selection.moveTo(0, 0);
  
          this.$resetRowCache(0);
          this.setUndoManager(this.$undoManager);
          this.getUndoManager().reset();
      };
  
      /**
       * Returns the current [[Document `Document`]] as a string.
       * @method toString
       * @returns {String}
       * @alias EditSession.getValue
       *
       **/
  
      /**
       * Returns the current [[Document `Document`]] as a string.
       * @method getValue
       * @returns {String}
       * @alias EditSession.toString
       **/
      this.getValue =
      this.toString = function() {
          return this.doc.getValue();
      };
  
      /**
       * Returns selection object.
       **/
      this.getSelection = function() {
          return this.selection;
      };
  
      /**
       * {:BackgroundTokenizer.getState}
       * @param {Number} row The row to start at
       *
       * @related BackgroundTokenizer.getState
       **/
      this.getState = function(row) {
          return this.bgTokenizer.getState(row);
      };
  
      /**
       * Starts tokenizing at the row indicated. Returns a list of objects of the tokenized rows.
       * @param {Number} row The row to start at
       *
       *
       *
       **/
      this.getTokens = function(row) {
          return this.bgTokenizer.getTokens(row);
      };
  
      /**
       * Returns an object indicating the token at the current row. The object has two properties: `index` and `start`.
       * @param {Number} row The row number to retrieve from
       * @param {Number} column The column number to retrieve from
       *
       *
       **/
      this.getTokenAt = function(row, column) {
          var tokens = this.bgTokenizer.getTokens(row);
          var token, c = 0;
          if (column == null) {
              var i = tokens.length - 1;
              c = this.getLine(row).length;
          } else {
              for (var i = 0; i < tokens.length; i++) {
                  c += tokens[i].value.length;
                  if (c >= column)
                      break;
              }
          }
          token = tokens[i];
          if (!token)
              return null;
          token.index = i;
          token.start = c - token.value.length;
          return token;
      };
  
      /**
       * Sets the undo manager.
       * @param {UndoManager} undoManager The new undo manager
       *
       *
       **/
      this.setUndoManager = function(undoManager) {
          this.$undoManager = undoManager;
          
          if (this.$informUndoManager)
              this.$informUndoManager.cancel();
          
          if (undoManager) {
              var self = this;
              undoManager.addSession(this);
              this.$syncInformUndoManager = function() {
                  self.$informUndoManager.cancel();
                  self.mergeUndoDeltas = false;
              };
              this.$informUndoManager = lang.delayedCall(this.$syncInformUndoManager);
          } else {
              this.$syncInformUndoManager = function() {};
          }
      };
  
      /**
       * starts a new group in undo history
       **/
      this.markUndoGroup = function() {
          if (this.$syncInformUndoManager)
              this.$syncInformUndoManager();
      };
      
      this.$defaultUndoManager = {
          undo: function() {},
          redo: function() {},
          hasUndo: function() {},
          hasRedo: function() {},
          reset: function() {},
          add: function() {},
          addSelection: function() {},
          startNewGroup: function() {},
          addSession: function() {}
      };
  
      /**
       * Returns the current undo manager.
       **/
      this.getUndoManager = function() {
          return this.$undoManager || this.$defaultUndoManager;
      };
  
      /**
       * Returns the current value for tabs. If the user is using soft tabs, this will be a series of spaces (defined by [[EditSession.getTabSize `getTabSize()`]]); otherwise it's simply `'\t'`.
       **/
      this.getTabString = function() {
          if (this.getUseSoftTabs()) {
              return lang.stringRepeat(" ", this.getTabSize());
          } else {
              return "\t";
          }
      };
  
      /**
       * Pass `true` to enable the use of soft tabs. Soft tabs means you're using spaces instead of the tab character (`'\t'`).
       * @param {Boolean} useSoftTabs Value indicating whether or not to use soft tabs
       **/
      this.setUseSoftTabs = function(val) {
          this.setOption("useSoftTabs", val);
      };
      /**
       * Returns `true` if soft tabs are being used, `false` otherwise.
       * @returns {Boolean}
       **/
      this.getUseSoftTabs = function() {
          // todo might need more general way for changing settings from mode, but this is ok for now
          return this.$useSoftTabs && !this.$mode.$indentWithTabs;
      };
      /**
       * Set the number of spaces that define a soft tab; for example, passing in `4` transforms the soft tabs to be equivalent to four spaces. This function also emits the `changeTabSize` event.
       * @param {Number} tabSize The new tab size
       **/
      this.setTabSize = function(tabSize) {
          this.setOption("tabSize", tabSize);
      };
      /**
       * Returns the current tab size.
       **/
      this.getTabSize = function() {
          return this.$tabSize;
      };
  
      /**
       * Returns `true` if the character at the position is a soft tab.
       * @param {Object} position The position to check
       *
       **/
      this.isTabStop = function(position) {
          return this.$useSoftTabs && (position.column % this.$tabSize === 0);
      };
  
      /**
       * Set whether keyboard navigation of soft tabs moves the cursor within the soft tab, rather than over
       * @param {Boolean} navigateWithinSoftTabs Value indicating whether or not to navigate within soft tabs
       **/
      this.setNavigateWithinSoftTabs = function (navigateWithinSoftTabs) {
          this.setOption("navigateWithinSoftTabs", navigateWithinSoftTabs);
      };
      /**
       * Returns `true` if keyboard navigation moves the cursor within soft tabs, `false` if it moves the cursor over soft tabs.
       * @returns {Boolean}
       **/
      this.getNavigateWithinSoftTabs = function() {
          return this.$navigateWithinSoftTabs;
      };
  
      this.$overwrite = false;
      /**
       * Pass in `true` to enable overwrites in your session, or `false` to disable.
       *
       * If overwrites is enabled, any text you enter will type over any text after it. If the value of `overwrite` changes, this function also emits the `changeOverwrite` event.
       *
       * @param {Boolean} overwrite Defines whether or not to set overwrites
       *
       *
       **/
      this.setOverwrite = function(overwrite) {
          this.setOption("overwrite", overwrite);
      };
  
      /**
       * Returns `true` if overwrites are enabled; `false` otherwise.
       **/
      this.getOverwrite = function() {
          return this.$overwrite;
      };
  
      /**
       * Sets the value of overwrite to the opposite of whatever it currently is.
       **/
      this.toggleOverwrite = function() {
          this.setOverwrite(!this.$overwrite);
      };
  
      /**
       * Adds `className` to the `row`, to be used for CSS stylings and whatnot.
       * @param {Number} row The row number
       * @param {String} className The class to add
       *
       **/
      this.addGutterDecoration = function(row, className) {
          if (!this.$decorations[row])
              this.$decorations[row] = "";
          this.$decorations[row] += " " + className;
          this._signal("changeBreakpoint", {});
      };
  
      /**
       * Removes `className` from the `row`.
       * @param {Number} row The row number
       * @param {String} className The class to add
       *
       **/
      this.removeGutterDecoration = function(row, className) {
          this.$decorations[row] = (this.$decorations[row] || "").replace(" " + className, "");
          this._signal("changeBreakpoint", {});
      };
  
      /**
       * Returns an array of strings, indicating the breakpoint class (if any) applied to each row.
       * @returns {[String]}
       **/
      this.getBreakpoints = function() {
          return this.$breakpoints;
      };
  
      /**
       * Sets a breakpoint on every row number given by `rows`. This function also emites the `'changeBreakpoint'` event.
       * @param {Array} rows An array of row indices
       *
       **/
      this.setBreakpoints = function(rows) {
          this.$breakpoints = [];
          for (var i=0; i<rows.length; i++) {
              this.$breakpoints[rows[i]] = "ace_breakpoint";
          }
          this._signal("changeBreakpoint", {});
      };
  
      /**
       * Removes all breakpoints on the rows. This function also emits the `'changeBreakpoint'` event.
       **/
      this.clearBreakpoints = function() {
          this.$breakpoints = [];
          this._signal("changeBreakpoint", {});
      };
  
      /**
       * Sets a breakpoint on the row number given by `row`. This function also emits the `'changeBreakpoint'` event.
       * @param {Number} row A row index
       * @param {String} className Class of the breakpoint
       *
       **/
      this.setBreakpoint = function(row, className) {
          if (className === undefined)
              className = "ace_breakpoint";
          if (className)
              this.$breakpoints[row] = className;
          else
              delete this.$breakpoints[row];
          this._signal("changeBreakpoint", {});
      };
  
      /**
       * Removes a breakpoint on the row number given by `row`. This function also emits the `'changeBreakpoint'` event.
       * @param {Number} row A row index
       *
       **/
      this.clearBreakpoint = function(row) {
          delete this.$breakpoints[row];
          this._signal("changeBreakpoint", {});
      };
  
      /**
       * Adds a new marker to the given `Range`. If `inFront` is `true`, a front marker is defined, and the `'changeFrontMarker'` event fires; otherwise, the `'changeBackMarker'` event fires.
       * @param {Range} range Define the range of the marker
       * @param {String} clazz Set the CSS class for the marker
       * @param {Function | String} type Identify the type of the marker
       * @param {Boolean} inFront Set to `true` to establish a front marker
       *
       * @return {Number} The new marker id
       **/
      this.addMarker = function(range, clazz, type, inFront) {
          var id = this.$markerId++;
  
          var marker = {
              range : range,
              type : type || "line",
              renderer: typeof type == "function" ? type : null,
              clazz : clazz,
              inFront: !!inFront,
              id: id
          };
  
          if (inFront) {
              this.$frontMarkers[id] = marker;
              this._signal("changeFrontMarker");
          } else {
              this.$backMarkers[id] = marker;
              this._signal("changeBackMarker");
          }
  
          return id;
      };
  
      /**
       * Adds a dynamic marker to the session.
       * @param {Object} marker object with update method
       * @param {Boolean} inFront Set to `true` to establish a front marker
       *
       * @return {Object} The added marker
       **/
      this.addDynamicMarker = function(marker, inFront) {
          if (!marker.update)
              return;
          var id = this.$markerId++;
          marker.id = id;
          marker.inFront = !!inFront;
  
          if (inFront) {
              this.$frontMarkers[id] = marker;
              this._signal("changeFrontMarker");
          } else {
              this.$backMarkers[id] = marker;
              this._signal("changeBackMarker");
          }
  
          return marker;
      };
  
      /**
       * Removes the marker with the specified ID. If this marker was in front, the `'changeFrontMarker'` event is emitted. If the marker was in the back, the `'changeBackMarker'` event is emitted.
       * @param {Number} markerId A number representing a marker
       *
       **/
      this.removeMarker = function(markerId) {
          var marker = this.$frontMarkers[markerId] || this.$backMarkers[markerId];
          if (!marker)
              return;
  
          var markers = marker.inFront ? this.$frontMarkers : this.$backMarkers;
          delete (markers[markerId]);
          this._signal(marker.inFront ? "changeFrontMarker" : "changeBackMarker");
      };
  
      /**
       * Returns an object containing all of the markers, either front or back.
       * @param {Boolean} inFront If `true`, indicates you only want front markers; `false` indicates only back markers
       *
       * @returns {Object}
       **/
      this.getMarkers = function(inFront) {
          return inFront ? this.$frontMarkers : this.$backMarkers;
      };
  
      this.highlight = function(re) {
          if (!this.$searchHighlight) {
              var highlight = new SearchHighlight(null, "ace_selected-word", "text");
              this.$searchHighlight = this.addDynamicMarker(highlight);
          }
          this.$searchHighlight.setRegexp(re);
      };
  
      // experimental
      this.highlightLines = function(startRow, endRow, clazz, inFront) {
          if (typeof endRow != "number") {
              clazz = endRow;
              endRow = startRow;
          }
          if (!clazz)
              clazz = "ace_step";
  
          var range = new Range(startRow, 0, endRow, Infinity);
          range.id = this.addMarker(range, clazz, "fullLine", inFront);
          return range;
      };
  
      /*
       * Error:
       *  {
       *    row: 12,
       *    column: 2, //can be undefined
       *    text: "Missing argument",
       *    type: "error" // or "warning" or "info"
       *  }
       */
      /**
       * Sets annotations for the `EditSession`. This functions emits the `'changeAnnotation'` event.
       * @param {Array} annotations A list of annotations
       *
       **/
      this.setAnnotations = function(annotations) {
          this.$annotations = annotations;
          this._signal("changeAnnotation", {});
      };
  
      /**
       * Returns the annotations for the `EditSession`.
       * @returns {Array}
       **/
      this.getAnnotations = function() {
          return this.$annotations || [];
      };
  
      /**
       * Clears all the annotations for this session. This function also triggers the `'changeAnnotation'` event.
       **/
      this.clearAnnotations = function() {
          this.setAnnotations([]);
      };
  
      /**
       * If `text` contains either the newline (`\n`) or carriage-return ('\r') characters, `$autoNewLine` stores that value.
       * @param {String} text A block of text
       *
       **/
      this.$detectNewLine = function(text) {
          var match = text.match(/^.*?(\r?\n)/m);
          if (match) {
              this.$autoNewLine = match[1];
          } else {
              this.$autoNewLine = "\n";
          }
      };
  
      /**
       * Given a starting row and column, this method returns the `Range` of the first word boundary it finds.
       * @param {Number} row The row to start at
       * @param {Number} column The column to start at
       *
       * @returns {Range}
       **/
      this.getWordRange = function(row, column) {
          var line = this.getLine(row);
  
          var inToken = false;
          if (column > 0)
              inToken = !!line.charAt(column - 1).match(this.tokenRe);
  
          if (!inToken)
              inToken = !!line.charAt(column).match(this.tokenRe);
  
          if (inToken)
              var re = this.tokenRe;
          else if (/^\s+$/.test(line.slice(column-1, column+1)))
              var re = /\s/;
          else
              var re = this.nonTokenRe;
  
          var start = column;
          if (start > 0) {
              do {
                  start--;
              }
              while (start >= 0 && line.charAt(start).match(re));
              start++;
          }
  
          var end = column;
          while (end < line.length && line.charAt(end).match(re)) {
              end++;
          }
  
          return new Range(row, start, row, end);
      };
  
      /**
       * Gets the range of a word, including its right whitespace.
       * @param {Number} row The row number to start from
       * @param {Number} column The column number to start from
       *
       * @return {Range}
       **/
      this.getAWordRange = function(row, column) {
          var wordRange = this.getWordRange(row, column);
          var line = this.getLine(wordRange.end.row);
  
          while (line.charAt(wordRange.end.column).match(/[ \t]/)) {
              wordRange.end.column += 1;
          }
          return wordRange;
      };
  
      /**
       * {:Document.setNewLineMode.desc}
       * @param {String} newLineMode {:Document.setNewLineMode.param}
       *
       *
       * @related Document.setNewLineMode
       **/
      this.setNewLineMode = function(newLineMode) {
          this.doc.setNewLineMode(newLineMode);
      };
  
      /**
       *
       * Returns the current new line mode.
       * @returns {String}
       * @related Document.getNewLineMode
       **/
      this.getNewLineMode = function() {
          return this.doc.getNewLineMode();
      };
  
      /**
       * Identifies if you want to use a worker for the `EditSession`.
       * @param {Boolean} useWorker Set to `true` to use a worker
       *
       **/
      this.setUseWorker = function(useWorker) { this.setOption("useWorker", useWorker); };
  
      /**
       * Returns `true` if workers are being used.
       **/
      this.getUseWorker = function() { return this.$useWorker; };
  
      /**
       * Reloads all the tokens on the current session. This function calls [[BackgroundTokenizer.start `BackgroundTokenizer.start ()`]] to all the rows; it also emits the `'tokenizerUpdate'` event.
       **/
      this.onReloadTokenizer = function(e) {
          var rows = e.data;
          this.bgTokenizer.start(rows.first);
          this._signal("tokenizerUpdate", e);
      };
  
      this.$modes = config.$modes;
  
      /**
       * Sets a new text mode for the `EditSession`. This method also emits the `'changeMode'` event. If a [[BackgroundTokenizer `BackgroundTokenizer`]] is set, the `'tokenizerUpdate'` event is also emitted.
       * @param {TextMode} mode Set a new text mode
       * @param {cb} optional callback
       *
       **/
      this.$mode = null;
      this.$modeId = null;
      this.setMode = function(mode, cb) {
          if (mode && typeof mode === "object") {
              if (mode.getTokenizer)
                  return this.$onChangeMode(mode);
              var options = mode;
              var path = options.path;
          } else {
              path = mode || "ace/mode/text";
          }
  
          // this is needed if ace isn't on require path (e.g tests in node)
          if (!this.$modes["ace/mode/text"])
              this.$modes["ace/mode/text"] = new TextMode();
  
          if (this.$modes[path] && !options) {
              this.$onChangeMode(this.$modes[path]);
              cb && cb();
              return;
          }
          // load on demand
          this.$modeId = path;
          config.loadModule(["mode", path], function(m) {
              if (this.$modeId !== path)
                  return cb && cb();
              if (this.$modes[path] && !options) {
                  this.$onChangeMode(this.$modes[path]);
              } else if (m && m.Mode) {
                  m = new m.Mode(options);
                  if (!options) {
                      this.$modes[path] = m;
                      m.$id = path;
                  }
                  this.$onChangeMode(m);
              }
              cb && cb();
          }.bind(this));
  
          // set mode to text until loading is finished
          if (!this.$mode)
              this.$onChangeMode(this.$modes["ace/mode/text"], true);
      };
  
      this.$onChangeMode = function(mode, $isPlaceholder) {
          if (!$isPlaceholder)
              this.$modeId = mode.$id;
          if (this.$mode === mode) 
              return;
  
          this.$mode = mode;
  
          this.$stopWorker();
  
          if (this.$useWorker)
              this.$startWorker();
  
          var tokenizer = mode.getTokenizer();
  
          if(tokenizer.addEventListener !== undefined) {
              var onReloadTokenizer = this.onReloadTokenizer.bind(this);
              tokenizer.addEventListener("update", onReloadTokenizer);
          }
  
          if (!this.bgTokenizer) {
              this.bgTokenizer = new BackgroundTokenizer(tokenizer);
              var _self = this;
              this.bgTokenizer.addEventListener("update", function(e) {
                  _self._signal("tokenizerUpdate", e);
              });
          } else {
              this.bgTokenizer.setTokenizer(tokenizer);
          }
  
          this.bgTokenizer.setDocument(this.getDocument());
  
          this.tokenRe = mode.tokenRe;
          this.nonTokenRe = mode.nonTokenRe;
  
          
          if (!$isPlaceholder) {
              // experimental method, used by c9 findiniles
              if (mode.attachToSession)
                  mode.attachToSession(this);
              this.$options.wrapMethod.set.call(this, this.$wrapMethod);
              this.$setFolding(mode.foldingRules);
              this.bgTokenizer.start(0);
              this._emit("changeMode");
          }
      };
  
      this.$stopWorker = function() {
          if (this.$worker) {
              this.$worker.terminate();
              this.$worker = null;
          }
      };
  
      this.$startWorker = function() {
          try {
              this.$worker = this.$mode.createWorker(this);
          } catch (e) {
              config.warn("Could not load worker", e);
              this.$worker = null;
          }
      };
  
      /**
       * Returns the current text mode.
       * @returns {TextMode} The current text mode
       **/
      this.getMode = function() {
          return this.$mode;
      };
  
      this.$scrollTop = 0;
      /**
       * This function sets the scroll top value. It also emits the `'changeScrollTop'` event.
       * @param {Number} scrollTop The new scroll top value
       *
       **/
      this.setScrollTop = function(scrollTop) {
          // TODO: should we force integer lineheight instead? scrollTop = Math.round(scrollTop); 
          if (this.$scrollTop === scrollTop || isNaN(scrollTop))
              return;
  
          this.$scrollTop = scrollTop;
          this._signal("changeScrollTop", scrollTop);
      };
  
      /**
       * [Returns the value of the distance between the top of the editor and the topmost part of the visible content.]{: #EditSession.getScrollTop}
       * @returns {Number}
       **/
      this.getScrollTop = function() {
          return this.$scrollTop;
      };
  
      this.$scrollLeft = 0;
      /**
       * [Sets the value of the distance between the left of the editor and the leftmost part of the visible content.]{: #EditSession.setScrollLeft}
       **/
      this.setScrollLeft = function(scrollLeft) {
          // scrollLeft = Math.round(scrollLeft);
          if (this.$scrollLeft === scrollLeft || isNaN(scrollLeft))
              return;
  
          this.$scrollLeft = scrollLeft;
          this._signal("changeScrollLeft", scrollLeft);
      };
  
      /**
       * [Returns the value of the distance between the left of the editor and the leftmost part of the visible content.]{: #EditSession.getScrollLeft}
       * @returns {Number}
       **/
      this.getScrollLeft = function() {
          return this.$scrollLeft;
      };
  
      /**
       * Returns the width of the screen.
       * @returns {Number}
       **/
      this.getScreenWidth = function() {
          this.$computeWidth();
          if (this.lineWidgets) 
              return Math.max(this.getLineWidgetMaxWidth(), this.screenWidth);
          return this.screenWidth;
      };
      
      this.getLineWidgetMaxWidth = function() {
          if (this.lineWidgetsWidth != null) return this.lineWidgetsWidth;
          var width = 0;
          this.lineWidgets.forEach(function(w) {
              if (w && w.screenWidth > width)
                  width = w.screenWidth;
          });
          return this.lineWidgetWidth = width;
      };
  
      this.$computeWidth = function(force) {
          if (this.$modified || force) {
              this.$modified = false;
  
              if (this.$useWrapMode)
                  return this.screenWidth = this.$wrapLimit;
  
              var lines = this.doc.getAllLines();
              var cache = this.$rowLengthCache;
              var longestScreenLine = 0;
              var foldIndex = 0;
              var foldLine = this.$foldData[foldIndex];
              var foldStart = foldLine ? foldLine.start.row : Infinity;
              var len = lines.length;
  
              for (var i = 0; i < len; i++) {
                  if (i > foldStart) {
                      i = foldLine.end.row + 1;
                      if (i >= len)
                          break;
                      foldLine = this.$foldData[foldIndex++];
                      foldStart = foldLine ? foldLine.start.row : Infinity;
                  }
  
                  if (cache[i] == null)
                      cache[i] = this.$getStringScreenWidth(lines[i])[0];
  
                  if (cache[i] > longestScreenLine)
                      longestScreenLine = cache[i];
              }
              this.screenWidth = longestScreenLine;
          }
      };
  
      /**
       * Returns a verbatim copy of the given line as it is in the document
       * @param {Number} row The row to retrieve from
       *
       * @returns {String}
       **/
      this.getLine = function(row) {
          return this.doc.getLine(row);
      };
  
      /**
       * Returns an array of strings of the rows between `firstRow` and `lastRow`. This function is inclusive of `lastRow`.
       * @param {Number} firstRow The first row index to retrieve
       * @param {Number} lastRow The final row index to retrieve
       *
       * @returns {[String]}
       *
       **/
      this.getLines = function(firstRow, lastRow) {
          return this.doc.getLines(firstRow, lastRow);
      };
  
      /**
       * Returns the number of rows in the document.
       * @returns {Number}
       **/
      this.getLength = function() {
          return this.doc.getLength();
      };
  
      /**
       * {:Document.getTextRange.desc}
       * @param {Range} range The range to work with
       *
       * @returns {String}
       **/
      this.getTextRange = function(range) {
          return this.doc.getTextRange(range || this.selection.getRange());
      };
  
      /**
       * Inserts a block of `text` and the indicated `position`.
       * @param {Object} position The position {row, column} to start inserting at
       * @param {String} text A chunk of text to insert
       * @returns {Object} The position of the last line of `text`. If the length of `text` is 0, this function simply returns `position`.
       *
       *
       **/
      this.insert = function(position, text) {
          return this.doc.insert(position, text);
      };
  
      /**
       * Removes the `range` from the document.
       * @param {Range} range A specified Range to remove
       * @returns {Object} The new `start` property of the range, which contains `startRow` and `startColumn`. If `range` is empty, this function returns the unmodified value of `range.start`.
       *
       * @related Document.remove
       *
       **/
      this.remove = function(range) {
          return this.doc.remove(range);
      };
      
      /**
       * Removes a range of full lines. This method also triggers the `'change'` event.
       * @param {Number} firstRow The first row to be removed
       * @param {Number} lastRow The last row to be removed
       * @returns {[String]} Returns all the removed lines.
       *
       * @related Document.removeFullLines
       *
       **/
      this.removeFullLines = function(firstRow, lastRow){
          return this.doc.removeFullLines(firstRow, lastRow);
      };
  
      /**
       * Reverts previous changes to your document.
       * @param {Array} deltas An array of previous changes
       * @param {Boolean} dontSelect [If `true`, doesn't select the range of where the change occured]{: #dontSelect}
       *
       * @returns {Range}
       **/
      this.undoChanges = function(deltas, dontSelect) {
          if (!deltas.length)
              return;
  
          this.$fromUndo = true;
          for (var i = deltas.length - 1; i != -1; i--) {
              var delta = deltas[i];
              if (delta.action == "insert" || delta.action == "remove") {
                  this.doc.revertDelta(delta);
              } else if (delta.folds) {
                  this.addFolds(delta.folds);
              }
          }
          if (!dontSelect && this.$undoSelect) {
              if (deltas.selectionBefore)
                  this.selection.fromJSON(deltas.selectionBefore);
              else
                  this.selection.setRange(this.$getUndoSelection(deltas, true));
          }
          this.$fromUndo = false;
      };
  
      /**
       * Re-implements a previously undone change to your document.
       * @param {Array} deltas An array of previous changes
       * @param {Boolean} dontSelect {:dontSelect}
       *
       * @returns {Range}
       **/
      this.redoChanges = function(deltas, dontSelect) {
          if (!deltas.length)
              return;
  
          this.$fromUndo = true;
          for (var i = 0; i < deltas.length; i++) {
              var delta = deltas[i];
              if (delta.action == "insert" || delta.action == "remove") {
                  this.doc.$safeApplyDelta(delta);
              }
          }
  
          if (!dontSelect && this.$undoSelect) {
              if (deltas.selectionAfter)
                  this.selection.fromJSON(deltas.selectionAfter);
              else
                  this.selection.setRange(this.$getUndoSelection(deltas, false));
          }
          this.$fromUndo = false;
      };
  
      /**
       * Enables or disables highlighting of the range where an undo occurred.
       * @param {Boolean} enable If `true`, selects the range of the reinserted change
       *      
       **/
      this.setUndoSelect = function(enable) {
          this.$undoSelect = enable;
      };
  
      this.$getUndoSelection = function(deltas, isUndo) {
          function isInsert(delta) {
              return isUndo ? delta.action !== "insert" : delta.action === "insert";
          }
  
          var range, point;
  
          for (var i = 0; i < deltas.length; i++) {
              var delta = deltas[i];
              if (!delta.start) continue; // skip folds
              if (!range) {
                  if (isInsert(delta)) {
                      range = Range.fromPoints(delta.start, delta.end);
                  } else {
                      range = Range.fromPoints(delta.start, delta.start);
                  }
                  continue;
              }
              
              if (isInsert(delta)) {
                  point = delta.start;
                  if (range.compare(point.row, point.column) == -1) {
                      range.setStart(point);
                  }
                  point = delta.end;
                  if (range.compare(point.row, point.column) == 1) {
                      range.setEnd(point);
                  }
              } else {
                  point = delta.start;
                  if (range.compare(point.row, point.column) == -1) {
                      range = Range.fromPoints(delta.start, delta.start);
                  }
              }
          }
          return range;
      };
  
      /**
       * Replaces a range in the document with the new `text`.
       *
       * @param {Range} range A specified Range to replace
       * @param {String} text The new text to use as a replacement
       * @returns {Object} An object containing the final row and column, like this:
       * ```
       * {row: endRow, column: 0}
       * ```
       * If the text and range are empty, this function returns an object containing the current `range.start` value.
       * If the text is the exact same as what currently exists, this function returns an object containing the current `range.end` value.
       *
       * @related Document.replace
       **/
      this.replace = function(range, text) {
          return this.doc.replace(range, text);
      };
  
      /**
       * Moves a range of text from the given range to the given position. `toPosition` is an object that looks like this:
       *  ```json
       *    { row: newRowLocation, column: newColumnLocation }
       *  ```
       * @param {Range} fromRange The range of text you want moved within the document
       * @param {Object} toPosition The location (row and column) where you want to move the text to
       * @returns {Range} The new range where the text was moved to.
       **/
      this.moveText = function(fromRange, toPosition, copy) {
          var text = this.getTextRange(fromRange);
          var folds = this.getFoldsInRange(fromRange);
  
          var toRange = Range.fromPoints(toPosition, toPosition);
          if (!copy) {
              this.remove(fromRange);
              var rowDiff = fromRange.start.row - fromRange.end.row;
              var collDiff = rowDiff ? -fromRange.end.column : fromRange.start.column - fromRange.end.column;
              if (collDiff) {
                  if (toRange.start.row == fromRange.end.row && toRange.start.column > fromRange.end.column)
                      toRange.start.column += collDiff;
                  if (toRange.end.row == fromRange.end.row && toRange.end.column > fromRange.end.column)
                      toRange.end.column += collDiff;
              }
              if (rowDiff && toRange.start.row >= fromRange.end.row) {
                  toRange.start.row += rowDiff;
                  toRange.end.row += rowDiff;
              }
          }
  
          toRange.end = this.insert(toRange.start, text);
          if (folds.length) {
              var oldStart = fromRange.start;
              var newStart = toRange.start;
              var rowDiff = newStart.row - oldStart.row;
              var collDiff = newStart.column - oldStart.column;
              this.addFolds(folds.map(function(x) {
                  x = x.clone();
                  if (x.start.row == oldStart.row)
                      x.start.column += collDiff;
                  if (x.end.row == oldStart.row)
                      x.end.column += collDiff;
                  x.start.row += rowDiff;
                  x.end.row += rowDiff;
                  return x;
              }));
          }
  
          return toRange;
      };
  
      /**
       * Indents all the rows, from `startRow` to `endRow` (inclusive), by prefixing each row with the token in `indentString`.
       *
       * If `indentString` contains the `'\t'` character, it's replaced by whatever is defined by [[EditSession.getTabString `getTabString()`]].
       * @param {Number} startRow Starting row
       * @param {Number} endRow Ending row
       * @param {String} indentString The indent token
       *
       *
       **/
      this.indentRows = function(startRow, endRow, indentString) {
          indentString = indentString.replace(/\t/g, this.getTabString());
          for (var row=startRow; row<=endRow; row++)
              this.doc.insertInLine({row: row, column: 0}, indentString);
      };
  
      /**
       * Outdents all the rows defined by the `start` and `end` properties of `range`.
       * @param {Range} range A range of rows
       *
       **/
      this.outdentRows = function (range) {
          var rowRange = range.collapseRows();
          var deleteRange = new Range(0, 0, 0, 0);
          var size = this.getTabSize();
  
          for (var i = rowRange.start.row; i <= rowRange.end.row; ++i) {
              var line = this.getLine(i);
  
              deleteRange.start.row = i;
              deleteRange.end.row = i;
              for (var j = 0; j < size; ++j)
                  if (line.charAt(j) != ' ')
                      break;
              if (j < size && line.charAt(j) == '\t') {
                  deleteRange.start.column = j;
                  deleteRange.end.column = j + 1;
              } else {
                  deleteRange.start.column = 0;
                  deleteRange.end.column = j;
              }
              this.remove(deleteRange);
          }
      };
  
      this.$moveLines = function(firstRow, lastRow, dir) {
          firstRow = this.getRowFoldStart(firstRow);
          lastRow = this.getRowFoldEnd(lastRow);
          if (dir < 0) {
              var row = this.getRowFoldStart(firstRow + dir);
              if (row < 0) return 0;
              var diff = row-firstRow;
          } else if (dir > 0) {
              var row = this.getRowFoldEnd(lastRow + dir);
              if (row > this.doc.getLength()-1) return 0;
              var diff = row-lastRow;
          } else {
              firstRow = this.$clipRowToDocument(firstRow);
              lastRow = this.$clipRowToDocument(lastRow);
              var diff = lastRow - firstRow + 1;
          }
  
          var range = new Range(firstRow, 0, lastRow, Number.MAX_VALUE);
          var folds = this.getFoldsInRange(range).map(function(x){
              x = x.clone();
              x.start.row += diff;
              x.end.row += diff;
              return x;
          });
          
          var lines = dir == 0
              ? this.doc.getLines(firstRow, lastRow)
              : this.doc.removeFullLines(firstRow, lastRow);
          this.doc.insertFullLines(firstRow+diff, lines);
          folds.length && this.addFolds(folds);
          return diff;
      };
      /**
       * Shifts all the lines in the document up one, starting from `firstRow` and ending at `lastRow`.
       * @param {Number} firstRow The starting row to move up
       * @param {Number} lastRow The final row to move up
       * @returns {Number} If `firstRow` is less-than or equal to 0, this function returns 0. Otherwise, on success, it returns -1.
       *
       **/
      this.moveLinesUp = function(firstRow, lastRow) {
          return this.$moveLines(firstRow, lastRow, -1);
      };
  
      /**
       * Shifts all the lines in the document down one, starting from `firstRow` and ending at `lastRow`.
       * @param {Number} firstRow The starting row to move down
       * @param {Number} lastRow The final row to move down
       * @returns {Number} If `firstRow` is less-than or equal to 0, this function returns 0. Otherwise, on success, it returns -1.
       **/
      this.moveLinesDown = function(firstRow, lastRow) {
          return this.$moveLines(firstRow, lastRow, 1);
      };
  
      /**
       * Duplicates all the text between `firstRow` and `lastRow`.
       * @param {Number} firstRow The starting row to duplicate
       * @param {Number} lastRow The final row to duplicate
       * @returns {Number} Returns the number of new rows added; in other words, `lastRow - firstRow + 1`.
       *
       *
       **/
      this.duplicateLines = function(firstRow, lastRow) {
          return this.$moveLines(firstRow, lastRow, 0);
      };
  
  
      this.$clipRowToDocument = function(row) {
          return Math.max(0, Math.min(row, this.doc.getLength()-1));
      };
  
      this.$clipColumnToRow = function(row, column) {
          if (column < 0)
              return 0;
          return Math.min(this.doc.getLine(row).length, column);
      };
  
  
      this.$clipPositionToDocument = function(row, column) {
          column = Math.max(0, column);
  
          if (row < 0) {
              row = 0;
              column = 0;
          } else {
              var len = this.doc.getLength();
              if (row >= len) {
                  row = len - 1;
                  column = this.doc.getLine(len-1).length;
              } else {
                  column = Math.min(this.doc.getLine(row).length, column);
              }
          }
  
          return {
              row: row,
              column: column
          };
      };
  
      this.$clipRangeToDocument = function(range) {
          if (range.start.row < 0) {
              range.start.row = 0;
              range.start.column = 0;
          } else {
              range.start.column = this.$clipColumnToRow(
                  range.start.row,
                  range.start.column
              );
          }
  
          var len = this.doc.getLength() - 1;
          if (range.end.row > len) {
              range.end.row = len;
              range.end.column = this.doc.getLine(len).length;
          } else {
              range.end.column = this.$clipColumnToRow(
                  range.end.row,
                  range.end.column
              );
          }
          return range;
      };
  
      // WRAPMODE
      this.$wrapLimit = 80;
      this.$useWrapMode = false;
      this.$wrapLimitRange = {
          min : null,
          max : null
      };
  
      /**
       * Sets whether or not line wrapping is enabled. If `useWrapMode` is different than the current value, the `'changeWrapMode'` event is emitted.
       * @param {Boolean} useWrapMode Enable (or disable) wrap mode
       *
       **/
      this.setUseWrapMode = function(useWrapMode) {
          if (useWrapMode != this.$useWrapMode) {
              this.$useWrapMode = useWrapMode;
              this.$modified = true;
              this.$resetRowCache(0);
  
              // If wrapMode is activaed, the wrapData array has to be initialized.
              if (useWrapMode) {
                  var len = this.getLength();
                  this.$wrapData = Array(len);
                  this.$updateWrapData(0, len - 1);
              }
  
              this._signal("changeWrapMode");
          }
      };
  
      /**
       * Returns `true` if wrap mode is being used; `false` otherwise.
       * @returns {Boolean}
       **/
      this.getUseWrapMode = function() {
          return this.$useWrapMode;
      };
  
      // Allow the wrap limit to move freely between min and max. Either
      // parameter can be null to allow the wrap limit to be unconstrained
      // in that direction. Or set both parameters to the same number to pin
      // the limit to that value.
      /**
       * Sets the boundaries of wrap. Either value can be `null` to have an unconstrained wrap, or, they can be the same number to pin the limit. If the wrap limits for `min` or `max` are different, this method also emits the `'changeWrapMode'` event.
       * @param {Number} min The minimum wrap value (the left side wrap)
       * @param {Number} max The maximum wrap value (the right side wrap)
       *
       **/
      this.setWrapLimitRange = function(min, max) {
          if (this.$wrapLimitRange.min !== min || this.$wrapLimitRange.max !== max) {
              this.$wrapLimitRange = { min: min, max: max };
              this.$modified = true;
              this.$bidiHandler.markAsDirty();
  
              // This will force a recalculation of the wrap limit
              if (this.$useWrapMode)
                  this._signal("changeWrapMode");
          }
      };
  
      /**
       * This should generally only be called by the renderer when a resize is detected.
       * @param {Number} desiredLimit The new wrap limit
       * @returns {Boolean}
       *
       * @private
       **/
      this.adjustWrapLimit = function(desiredLimit, $printMargin) {
          var limits = this.$wrapLimitRange;
          if (limits.max < 0)
              limits = {min: $printMargin, max: $printMargin};
          var wrapLimit = this.$constrainWrapLimit(desiredLimit, limits.min, limits.max);
          if (wrapLimit != this.$wrapLimit && wrapLimit > 1) {
              this.$wrapLimit = wrapLimit;
              this.$modified = true;
              if (this.$useWrapMode) {
                  this.$updateWrapData(0, this.getLength() - 1);
                  this.$resetRowCache(0);
                  this._signal("changeWrapLimit");
              }
              return true;
          }
          return false;
      };
  
      this.$constrainWrapLimit = function(wrapLimit, min, max) {
          if (min)
              wrapLimit = Math.max(min, wrapLimit);
  
          if (max)
              wrapLimit = Math.min(max, wrapLimit);
  
          return wrapLimit;
      };
  
      /**
       * Returns the value of wrap limit.
       * @returns {Number} The wrap limit.
       **/
      this.getWrapLimit = function() {
          return this.$wrapLimit;
      };
      
      /**
       * Sets the line length for soft wrap in the editor. Lines will break
       *  at a minimum of the given length minus 20 chars and at a maximum
       *  of the given number of chars.
       * @param {number} limit The maximum line length in chars, for soft wrapping lines.
       */
      this.setWrapLimit = function (limit) {
          this.setWrapLimitRange(limit, limit);
      };
      
      /**
       * Returns an object that defines the minimum and maximum of the wrap limit; it looks something like this:
       *
       *     { min: wrapLimitRange_min, max: wrapLimitRange_max }
       *
       * @returns {Object}
       **/
      this.getWrapLimitRange = function() {
          // Avoid unexpected mutation by returning a copy
          return {
              min : this.$wrapLimitRange.min,
              max : this.$wrapLimitRange.max
          };
      };
  
      this.$updateInternalDataOnChange = function(delta) {
          var useWrapMode = this.$useWrapMode;
          var action = delta.action;
          var start = delta.start;
          var end = delta.end;
          var firstRow = start.row;
          var lastRow = end.row;
          var len = lastRow - firstRow;
          var removedFolds = null;
          
          this.$updating = true;
          if (len != 0) {
              if (action === "remove") {
                  this[useWrapMode ? "$wrapData" : "$rowLengthCache"].splice(firstRow, len);
  
                  var foldLines = this.$foldData;
                  removedFolds = this.getFoldsInRange(delta);
                  this.removeFolds(removedFolds);
  
                  var foldLine = this.getFoldLine(end.row);
                  var idx = 0;
                  if (foldLine) {
                      foldLine.addRemoveChars(end.row, end.column, start.column - end.column);
                      foldLine.shiftRow(-len);
  
                      var foldLineBefore = this.getFoldLine(firstRow);
                      if (foldLineBefore && foldLineBefore !== foldLine) {
                          foldLineBefore.merge(foldLine);
                          foldLine = foldLineBefore;
                      }
                      idx = foldLines.indexOf(foldLine) + 1;
                  }
  
                  for (idx; idx < foldLines.length; idx++) {
                      var foldLine = foldLines[idx];
                      if (foldLine.start.row >= end.row) {
                          foldLine.shiftRow(-len);
                      }
                  }
  
                  lastRow = firstRow;
              } else {
                  var args = Array(len);
                  args.unshift(firstRow, 0);
                  var arr = useWrapMode ? this.$wrapData : this.$rowLengthCache;
                  arr.splice.apply(arr, args);
  
                  // If some new line is added inside of a foldLine, then split
                  // the fold line up.
                  var foldLines = this.$foldData;
                  var foldLine = this.getFoldLine(firstRow);
                  var idx = 0;
                  if (foldLine) {
                      var cmp = foldLine.range.compareInside(start.row, start.column);
                      // Inside of the foldLine range. Need to split stuff up.
                      if (cmp == 0) {
                          foldLine = foldLine.split(start.row, start.column);
                          if (foldLine) {
                              foldLine.shiftRow(len);
                              foldLine.addRemoveChars(lastRow, 0, end.column - start.column);
                          }
                      } else
                      // Infront of the foldLine but same row. Need to shift column.
                      if (cmp == -1) {
                          foldLine.addRemoveChars(firstRow, 0, end.column - start.column);
                          foldLine.shiftRow(len);
                      }
                      // Nothing to do if the insert is after the foldLine.
                      idx = foldLines.indexOf(foldLine) + 1;
                  }
  
                  for (idx; idx < foldLines.length; idx++) {
                      var foldLine = foldLines[idx];
                      if (foldLine.start.row >= firstRow) {
                          foldLine.shiftRow(len);
                      }
                  }
              }
          } else {
              // Realign folds. E.g. if you add some new chars before a fold, the
              // fold should "move" to the right.
              len = Math.abs(delta.start.column - delta.end.column);
              if (action === "remove") {
                  // Get all the folds in the change range and remove them.
                  removedFolds = this.getFoldsInRange(delta);
                  this.removeFolds(removedFolds);
  
                  len = -len;
              }
              var foldLine = this.getFoldLine(firstRow);
              if (foldLine) {
                  foldLine.addRemoveChars(firstRow, start.column, len);
              }
          }
  
          if (useWrapMode && this.$wrapData.length != this.doc.getLength()) {
              console.error("doc.getLength() and $wrapData.length have to be the same!");
          }
          this.$updating = false;
  
          if (useWrapMode)
              this.$updateWrapData(firstRow, lastRow);
          else
              this.$updateRowLengthCache(firstRow, lastRow);
  
          return removedFolds;
      };
  
      this.$updateRowLengthCache = function(firstRow, lastRow, b) {
          this.$rowLengthCache[firstRow] = null;
          this.$rowLengthCache[lastRow] = null;
      };
  
      this.$updateWrapData = function(firstRow, lastRow) {
          var lines = this.doc.getAllLines();
          var tabSize = this.getTabSize();
          var wrapData = this.$wrapData;
          var wrapLimit = this.$wrapLimit;
          var tokens;
          var foldLine;
  
          var row = firstRow;
          lastRow = Math.min(lastRow, lines.length - 1);
          while (row <= lastRow) {
              foldLine = this.getFoldLine(row, foldLine);
              if (!foldLine) {
                  tokens = this.$getDisplayTokens(lines[row]);
                  wrapData[row] = this.$computeWrapSplits(tokens, wrapLimit, tabSize);
                  row ++;
              } else {
                  tokens = [];
                  foldLine.walk(function(placeholder, row, column, lastColumn) {
                          var walkTokens;
                          if (placeholder != null) {
                              walkTokens = this.$getDisplayTokens(
                                              placeholder, tokens.length);
                              walkTokens[0] = PLACEHOLDER_START;
                              for (var i = 1; i < walkTokens.length; i++) {
                                  walkTokens[i] = PLACEHOLDER_BODY;
                              }
                          } else {
                              walkTokens = this.$getDisplayTokens(
                                  lines[row].substring(lastColumn, column),
                                  tokens.length);
                          }
                          tokens = tokens.concat(walkTokens);
                      }.bind(this),
                      foldLine.end.row,
                      lines[foldLine.end.row].length + 1
                  );
  
                  wrapData[foldLine.start.row] = this.$computeWrapSplits(tokens, wrapLimit, tabSize);
                  row = foldLine.end.row + 1;
              }
          }
      };
  
      // "Tokens"
      var CHAR = 1,
          CHAR_EXT = 2,
          PLACEHOLDER_START = 3,
          PLACEHOLDER_BODY =  4,
          PUNCTUATION = 9,
          SPACE = 10,
          TAB = 11,
          TAB_SPACE = 12;
  
  
      this.$computeWrapSplits = function(tokens, wrapLimit, tabSize) {
          if (tokens.length == 0) {
              return [];
          }
  
          var splits = [];
          var displayLength = tokens.length;
          var lastSplit = 0, lastDocSplit = 0;
  
          var isCode = this.$wrapAsCode;
  
          var indentedSoftWrap = this.$indentedSoftWrap;
          var maxIndent = wrapLimit <= Math.max(2 * tabSize, 8)
              || indentedSoftWrap === false ? 0 : Math.floor(wrapLimit / 2);
  
          function getWrapIndent() {
              var indentation = 0;
              if (maxIndent === 0)
                  return indentation;
              if (indentedSoftWrap) {
                  for (var i = 0; i < tokens.length; i++) {
                      var token = tokens[i];
                      if (token == SPACE)
                          indentation += 1;
                      else if (token == TAB)
                          indentation += tabSize;
                      else if (token == TAB_SPACE)
                          continue;
                      else
                          break;
                  }
              }
              if (isCode && indentedSoftWrap !== false)
                  indentation += tabSize;
              return Math.min(indentation, maxIndent);
          }
          function addSplit(screenPos) {
              // The document size is the current size - the extra width for tabs
              // and multipleWidth characters.
              var len = screenPos - lastSplit;
              for (var i = lastSplit; i < screenPos; i++) {
                  var ch = tokens[i];
                  if (ch === 12 || ch === 2) len -= 1;
              }
  
              if (!splits.length) {
                  indent = getWrapIndent();
                  splits.indent = indent;
              }
              lastDocSplit += len;
              splits.push(lastDocSplit);
              lastSplit = screenPos;
          }
          var indent = 0;
          while (displayLength - lastSplit > wrapLimit - indent) {
              // This is, where the split should be.
              var split = lastSplit + wrapLimit - indent;
  
              // If there is a space or tab at this split position, then making
              // a split is simple.
              if (tokens[split - 1] >= SPACE && tokens[split] >= SPACE) {
                  /* disabled see https://github.com/ajaxorg/ace/issues/1186
                  // Include all following spaces + tabs in this split as well.
                  while (tokens[split] >= SPACE) {
                      split ++;
                  } */
                  addSplit(split);
                  continue;
              }
  
              // === ELSE ===
              // Check if split is inside of a placeholder. Placeholder are
              // not splitable. Therefore, seek the beginning of the placeholder
              // and try to place the split before the placeholder's start.
              if (tokens[split] == PLACEHOLDER_START || tokens[split] == PLACEHOLDER_BODY) {
                  // Seek the start of the placeholder and do the split
                  // before the placeholder. By definition there always
                  // a PLACEHOLDER_START between split and lastSplit.
                  for (split; split != lastSplit - 1; split--) {
                      if (tokens[split] == PLACEHOLDER_START) {
                          // split++; << No incremental here as we want to
                          //  have the position before the Placeholder.
                          break;
                      }
                  }
  
                  // If the PLACEHOLDER_START is not the index of the
                  // last split, then we can do the split
                  if (split > lastSplit) {
                      addSplit(split);
                      continue;
                  }
  
                  // If the PLACEHOLDER_START IS the index of the last
                  // split, then we have to place the split after the
                  // placeholder. So, let's seek for the end of the placeholder.
                  split = lastSplit + wrapLimit;
                  for (split; split < tokens.length; split++) {
                      if (tokens[split] != PLACEHOLDER_BODY) {
                          break;
                      }
                  }
  
                  // If spilt == tokens.length, then the placeholder is the last
                  // thing in the line and adding a new split doesn't make sense.
                  if (split == tokens.length) {
                      break;  // Breaks the while-loop.
                  }
  
                  // Finally, add the split...
                  addSplit(split);
                  continue;
              }
  
              // === ELSE ===
              // Search for the first non space/tab/placeholder/punctuation token backwards.
              var minSplit = Math.max(split - (wrapLimit -(wrapLimit>>2)), lastSplit - 1);
              while (split > minSplit && tokens[split] < PLACEHOLDER_START) {
                  split --;
              }
              if (isCode) {
                  while (split > minSplit && tokens[split] < PLACEHOLDER_START) {
                      split --;
                  }
                  while (split > minSplit && tokens[split] == PUNCTUATION) {
                      split --;
                  }
              } else {
                  while (split > minSplit && tokens[split] < SPACE) {
                      split --;
                  }
              }
              // If we found one, then add the split.
              if (split > minSplit) {
                  addSplit(++split);
                  continue;
              }
  
              // === ELSE ===
              split = lastSplit + wrapLimit;
              // The split is inside of a CHAR or CHAR_EXT token and no space
              // around -> force a split.
              if (tokens[split] == CHAR_EXT)
                  split--;
              addSplit(split - indent);
          }
          return splits;
      };
  
      /**
       * Given a string, returns an array of the display characters, including tabs and spaces.
       * @param {String} str The string to check
       * @param {Number} offset The value to start at
       *
       **/
      this.$getDisplayTokens = function(str, offset) {
          var arr = [];
          var tabSize;
          offset = offset || 0;
  
          for (var i = 0; i < str.length; i++) {
              var c = str.charCodeAt(i);
              // Tab
              if (c == 9) {
                  tabSize = this.getScreenTabSize(arr.length + offset);
                  arr.push(TAB);
                  for (var n = 1; n < tabSize; n++) {
                      arr.push(TAB_SPACE);
                  }
              }
              // Space
              else if (c == 32) {
                  arr.push(SPACE);
              } else if((c > 39 && c < 48) || (c > 57 && c < 64)) {
                  arr.push(PUNCTUATION);
              }
              // full width characters
              else if (c >= 0x1100 && isFullWidth(c)) {
                  arr.push(CHAR, CHAR_EXT);
              } else {
                  arr.push(CHAR);
              }
          }
          return arr;
      };
  
      /**
       * Calculates the width of the string `str` on the screen while assuming that the string starts at the first column on the screen.
       * @param {String} str The string to calculate the screen width of
       * @param {Number} maxScreenColumn
       * @param {Number} screenColumn
       * @returns {[Number]} Returns an `int[]` array with two elements:<br/>
       * The first position indicates the number of columns for `str` on screen.<br/>
       * The second value contains the position of the document column that this function read until.
       *
       **/
      this.$getStringScreenWidth = function(str, maxScreenColumn, screenColumn) {
          if (maxScreenColumn == 0)
              return [0, 0];
          if (maxScreenColumn == null)
              maxScreenColumn = Infinity;
          screenColumn = screenColumn || 0;
  
          var c, column;
          for (column = 0; column < str.length; column++) {
              c = str.charCodeAt(column);
              // tab
              if (c == 9) {
                  screenColumn += this.getScreenTabSize(screenColumn);
              }
              // full width characters
              else if (c >= 0x1100 && isFullWidth(c)) {
                  screenColumn += 2;
              } else {
                  screenColumn += 1;
              }
              if (screenColumn > maxScreenColumn) {
                  break;
              }
          }
  
          return [screenColumn, column];
      };
  
      this.lineWidgets = null;
      /**
       * Returns number of screenrows in a wrapped line.
       * @param {Number} row The row number to check
       *
       * @returns {Number}
       **/
      this.getRowLength = function(row) {
          var h = 1;
          if (this.lineWidgets)
              h += this.lineWidgets[row] && this.lineWidgets[row].rowCount || 0;
          
          if (!this.$useWrapMode || !this.$wrapData[row])
              return h;
          else
              return this.$wrapData[row].length + h;
      };
      this.getRowLineCount = function(row) {
          if (!this.$useWrapMode || !this.$wrapData[row]) {
              return 1;
          } else {
              return this.$wrapData[row].length + 1;
          }
      };
  
      this.getRowWrapIndent = function(screenRow) {
          if (this.$useWrapMode) {
              var pos = this.screenToDocumentPosition(screenRow, Number.MAX_VALUE);
              var splits = this.$wrapData[pos.row];
              return splits.length && splits[0] < pos.column ? splits.indent : 0;
          } else {
              return 0;
          }
      };
  
      /**
       * Returns the position (on screen) for the last character in the provided screen row.
       * @param {Number} screenRow The screen row to check
       * @returns {Number}
       *
       * @related EditSession.documentToScreenColumn
       **/
      this.getScreenLastRowColumn = function(screenRow) {
          var pos = this.screenToDocumentPosition(screenRow, Number.MAX_VALUE);
          return this.documentToScreenColumn(pos.row, pos.column);
      };
  
      /**
       * For the given document row and column, this returns the column position of the last screen row.
       * @param {Number} docRow
       *
       * @param {Number} docColumn
       **/
      this.getDocumentLastRowColumn = function(docRow, docColumn) {
          var screenRow = this.documentToScreenRow(docRow, docColumn);
          return this.getScreenLastRowColumn(screenRow);
      };
  
      /**
       * For the given document row and column, this returns the document position of the last row.
       * @param {Number} docRow
       * @param {Number} docColumn
       *
       **/
      this.getDocumentLastRowColumnPosition = function(docRow, docColumn) {
          var screenRow = this.documentToScreenRow(docRow, docColumn);
          return this.screenToDocumentPosition(screenRow, Number.MAX_VALUE / 10);
      };
  
      /**
       * For the given row, this returns the split data.
       * @returns {String}
       **/
      this.getRowSplitData = function(row) {
          if (!this.$useWrapMode) {
              return undefined;
          } else {
              return this.$wrapData[row];
          }
      };
  
      /**
       * The distance to the next tab stop at the specified screen column.
       * @param {Number} screenColumn The screen column to check
       *
       * @returns {Number}
       **/
      this.getScreenTabSize = function(screenColumn) {
          return this.$tabSize - (screenColumn % this.$tabSize | 0);
      };
  
  
      this.screenToDocumentRow = function(screenRow, screenColumn) {
          return this.screenToDocumentPosition(screenRow, screenColumn).row;
      };
  
  
      this.screenToDocumentColumn = function(screenRow, screenColumn) {
          return this.screenToDocumentPosition(screenRow, screenColumn).column;
      };
  
      /**
       * Converts characters coordinates on the screen to characters coordinates within the document. [This takes into account code folding, word wrap, tab size, and any other visual modifications.]{: #conversionConsiderations}
       * @param {Number} screenRow The screen row to check
       * @param {Number} screenColumn The screen column to check
       * @param {int} screen character x-offset [optional]
       *
       * @returns {Object} The object returned has two properties: `row` and `column`.
       *
       * @related EditSession.documentToScreenPosition
       **/
      this.screenToDocumentPosition = function(screenRow, screenColumn, offsetX) {
          if (screenRow < 0)
              return {row: 0, column: 0};
  
          var line;
          var docRow = 0;
          var docColumn = 0;
          var column;
          var row = 0;
          var rowLength = 0;
  
          var rowCache = this.$screenRowCache;
          var i = this.$getRowCacheIndex(rowCache, screenRow);
          var l = rowCache.length;
          if (l && i >= 0) {
              var row = rowCache[i];
              var docRow = this.$docRowCache[i];
              var doCache = screenRow > rowCache[l - 1];
          } else {
              var doCache = !l;
          }
  
          var maxRow = this.getLength() - 1;
          var foldLine = this.getNextFoldLine(docRow);
          var foldStart = foldLine ? foldLine.start.row : Infinity;
  
          while (row <= screenRow) {
              rowLength = this.getRowLength(docRow);
              if (row + rowLength > screenRow || docRow >= maxRow) {
                  break;
              } else {
                  row += rowLength;
                  docRow++;
                  if (docRow > foldStart) {
                      docRow = foldLine.end.row+1;
                      foldLine = this.getNextFoldLine(docRow, foldLine);
                      foldStart = foldLine ? foldLine.start.row : Infinity;
                  }
              }
  
              if (doCache) {
                  this.$docRowCache.push(docRow);
                  this.$screenRowCache.push(row);
              }
          }
  
          if (foldLine && foldLine.start.row <= docRow) {
              line = this.getFoldDisplayLine(foldLine);
              docRow = foldLine.start.row;
          } else if (row + rowLength <= screenRow || docRow > maxRow) {
              // clip at the end of the document
              return {
                  row: maxRow,
                  column: this.getLine(maxRow).length
              };
          } else {
              line = this.getLine(docRow);
              foldLine = null;
          }
          var wrapIndent = 0, splitIndex = Math.floor(screenRow - row);
          if (this.$useWrapMode) {
              var splits = this.$wrapData[docRow];
              if (splits) {
                  column = splits[splitIndex];
                  if(splitIndex > 0 && splits.length) {
                      wrapIndent = splits.indent;
                      docColumn = splits[splitIndex - 1] || splits[splits.length - 1];
                      line = line.substring(docColumn);
                  }
              }
          }
  
          if (offsetX !== undefined && this.$bidiHandler.isBidiRow(row + splitIndex, docRow, splitIndex))
              screenColumn = this.$bidiHandler.offsetToCol(offsetX);
  
          docColumn += this.$getStringScreenWidth(line, screenColumn - wrapIndent)[1];
  
          // We remove one character at the end so that the docColumn
          // position returned is not associated to the next row on the screen.
          if (this.$useWrapMode && docColumn >= column)
              docColumn = column - 1;
  
          if (foldLine)
              return foldLine.idxToPosition(docColumn);
  
          return {row: docRow, column: docColumn};
      };
  
      /**
       * Converts document coordinates to screen coordinates. {:conversionConsiderations}
       * @param {Number} docRow The document row to check
       * @param {Number} docColumn The document column to check
       * @returns {Object} The object returned by this method has two properties: `row` and `column`.
       *
       * @related EditSession.screenToDocumentPosition
       **/
      this.documentToScreenPosition = function(docRow, docColumn) {
          // Normalize the passed in arguments.
          if (typeof docColumn === "undefined")
              var pos = this.$clipPositionToDocument(docRow.row, docRow.column);
          else
              pos = this.$clipPositionToDocument(docRow, docColumn);
  
          docRow = pos.row;
          docColumn = pos.column;
  
          var screenRow = 0;
          var foldStartRow = null;
          var fold = null;
  
          // Clamp the docRow position in case it's inside of a folded block.
          fold = this.getFoldAt(docRow, docColumn, 1);
          if (fold) {
              docRow = fold.start.row;
              docColumn = fold.start.column;
          }
  
          var rowEnd, row = 0;
  
  
          var rowCache = this.$docRowCache;
          var i = this.$getRowCacheIndex(rowCache, docRow);
          var l = rowCache.length;
          if (l && i >= 0) {
              var row = rowCache[i];
              var screenRow = this.$screenRowCache[i];
              var doCache = docRow > rowCache[l - 1];
          } else {
              var doCache = !l;
          }
  
          var foldLine = this.getNextFoldLine(row);
          var foldStart = foldLine ?foldLine.start.row :Infinity;
  
          while (row < docRow) {
              if (row >= foldStart) {
                  rowEnd = foldLine.end.row + 1;
                  if (rowEnd > docRow)
                      break;
                  foldLine = this.getNextFoldLine(rowEnd, foldLine);
                  foldStart = foldLine ?foldLine.start.row :Infinity;
              }
              else {
                  rowEnd = row + 1;
              }
  
              screenRow += this.getRowLength(row);
              row = rowEnd;
  
              if (doCache) {
                  this.$docRowCache.push(row);
                  this.$screenRowCache.push(screenRow);
              }
          }
  
          // Calculate the text line that is displayed in docRow on the screen.
          var textLine = "";
          // Check if the final row we want to reach is inside of a fold.
          if (foldLine && row >= foldStart) {
              textLine = this.getFoldDisplayLine(foldLine, docRow, docColumn);
              foldStartRow = foldLine.start.row;
          } else {
              textLine = this.getLine(docRow).substring(0, docColumn);
              foldStartRow = docRow;
          }
          var wrapIndent = 0;
          // Clamp textLine if in wrapMode.
          if (this.$useWrapMode) {
              var wrapRow = this.$wrapData[foldStartRow];
              if (wrapRow) {
                  var screenRowOffset = 0;
                  while (textLine.length >= wrapRow[screenRowOffset]) {
                      screenRow ++;
                      screenRowOffset++;
                  }
                  textLine = textLine.substring(
                      wrapRow[screenRowOffset - 1] || 0, textLine.length
                  );
                  wrapIndent = screenRowOffset > 0 ? wrapRow.indent : 0;
              }
          }
          
          if (this.lineWidgets && this.lineWidgets[row] && this.lineWidgets[row].rowsAbove)
              screenRow += this.lineWidgets[row].rowsAbove;
  
          return {
              row: screenRow,
              column: wrapIndent + this.$getStringScreenWidth(textLine)[0]
          };
      };
  
      /**
       * For the given document row and column, returns the screen column.
       * @param {Number} row
       * @param {Number} docColumn
       * @returns {Number}
       *
       **/
      this.documentToScreenColumn = function(row, docColumn) {
          return this.documentToScreenPosition(row, docColumn).column;
      };
  
      /**
       * For the given document row and column, returns the screen row.
       * @param {Number} docRow
       * @param {Number} docColumn
       *
       **/
      this.documentToScreenRow = function(docRow, docColumn) {
          return this.documentToScreenPosition(docRow, docColumn).row;
      };
  
      /**
       * Returns the length of the screen.
       * @returns {Number}
       **/
      this.getScreenLength = function() {
          var screenRows = 0;
          var fold = null;
          if (!this.$useWrapMode) {
              screenRows = this.getLength();
  
              // Remove the folded lines again.
              var foldData = this.$foldData;
              for (var i = 0; i < foldData.length; i++) {
                  fold = foldData[i];
                  screenRows -= fold.end.row - fold.start.row;
              }
          } else {
              var lastRow = this.$wrapData.length;
              var row = 0, i = 0;
              var fold = this.$foldData[i++];
              var foldStart = fold ? fold.start.row :Infinity;
  
              while (row < lastRow) {
                  var splits = this.$wrapData[row];
                  screenRows += splits ? splits.length + 1 : 1;
                  row ++;
                  if (row > foldStart) {
                      row = fold.end.row+1;
                      fold = this.$foldData[i++];
                      foldStart = fold ?fold.start.row :Infinity;
                  }
              }
          }
  
          // todo
          if (this.lineWidgets)
              screenRows += this.$getWidgetScreenLength();
  
          return screenRows;
      };
      
      /**
       * @private
       *
       */
      this.$setFontMetrics = function(fm) {
          if (!this.$enableVarChar) return;
          this.$getStringScreenWidth = function(str, maxScreenColumn, screenColumn) {
              if (maxScreenColumn === 0)
                  return [0, 0];
              if (!maxScreenColumn)
                  maxScreenColumn = Infinity;
              screenColumn = screenColumn || 0;
              
              var c, column;
              for (column = 0; column < str.length; column++) {
                  c = str.charAt(column);
                  // tab
                  if (c === "\t") {
                      screenColumn += this.getScreenTabSize(screenColumn);
                  } else {
                      screenColumn += fm.getCharacterWidth(c);
                  }
                  if (screenColumn > maxScreenColumn) {
                      break;
                  }
              }
              
              return [screenColumn, column];
          };
      };
      
      this.destroy = function() {
          if (this.bgTokenizer) {
              this.bgTokenizer.setDocument(null);
              this.bgTokenizer = null;
          }
          this.$stopWorker();
      };
  
      this.isFullWidth = isFullWidth;
  
      // For every keystroke this gets called once per char in the whole doc!!
      // Wouldn't hurt to make it a bit faster for c >= 0x1100
      function isFullWidth(c) {
          if (c < 0x1100)
              return false;
          return c >= 0x1100 && c <= 0x115F ||
                 c >= 0x11A3 && c <= 0x11A7 ||
                 c >= 0x11FA && c <= 0x11FF ||
                 c >= 0x2329 && c <= 0x232A ||
                 c >= 0x2E80 && c <= 0x2E99 ||
                 c >= 0x2E9B && c <= 0x2EF3 ||
                 c >= 0x2F00 && c <= 0x2FD5 ||
                 c >= 0x2FF0 && c <= 0x2FFB ||
                 c >= 0x3000 && c <= 0x303E ||
                 c >= 0x3041 && c <= 0x3096 ||
                 c >= 0x3099 && c <= 0x30FF ||
                 c >= 0x3105 && c <= 0x312D ||
                 c >= 0x3131 && c <= 0x318E ||
                 c >= 0x3190 && c <= 0x31BA ||
                 c >= 0x31C0 && c <= 0x31E3 ||
                 c >= 0x31F0 && c <= 0x321E ||
                 c >= 0x3220 && c <= 0x3247 ||
                 c >= 0x3250 && c <= 0x32FE ||
                 c >= 0x3300 && c <= 0x4DBF ||
                 c >= 0x4E00 && c <= 0xA48C ||
                 c >= 0xA490 && c <= 0xA4C6 ||
                 c >= 0xA960 && c <= 0xA97C ||
                 c >= 0xAC00 && c <= 0xD7A3 ||
                 c >= 0xD7B0 && c <= 0xD7C6 ||
                 c >= 0xD7CB && c <= 0xD7FB ||
                 c >= 0xF900 && c <= 0xFAFF ||
                 c >= 0xFE10 && c <= 0xFE19 ||
                 c >= 0xFE30 && c <= 0xFE52 ||
                 c >= 0xFE54 && c <= 0xFE66 ||
                 c >= 0xFE68 && c <= 0xFE6B ||
                 c >= 0xFF01 && c <= 0xFF60 ||
                 c >= 0xFFE0 && c <= 0xFFE6;
      }
  
  }).call(EditSession.prototype);
  
  require("./edit_session/folding").Folding.call(EditSession.prototype);
  require("./edit_session/bracket_match").BracketMatch.call(EditSession.prototype);
  
  
  config.defineOptions(EditSession.prototype, "session", {
      wrap: {
          set: function(value) {
              if (!value || value == "off")
                  value = false;
              else if (value == "free")
                  value = true;
              else if (value == "printMargin")
                  value = -1;
              else if (typeof value == "string")
                  value = parseInt(value, 10) || false;
  
              if (this.$wrap == value)
                  return;
              this.$wrap = value;
              if (!value) {
                  this.setUseWrapMode(false);
              } else {
                  var col = typeof value == "number" ? value : null;
                  this.setWrapLimitRange(col, col);
                  this.setUseWrapMode(true);
              }
          },
          get: function() {
              if (this.getUseWrapMode()) {
                  if (this.$wrap == -1)
                      return "printMargin";
                  if (!this.getWrapLimitRange().min)
                      return "free";
                  return this.$wrap;
              }
              return "off";
          },
          handlesSet: true
      },    
      wrapMethod: {
          // code|text|auto
          set: function(val) {
              val = val == "auto"
                  ? this.$mode.type != "text"
                  : val != "text";
              if (val != this.$wrapAsCode) {
                  this.$wrapAsCode = val;
                  if (this.$useWrapMode) {
                      this.$useWrapMode = false;
                      this.setUseWrapMode(true);
                  }
              }
          },
          initialValue: "auto"
      },
      indentedSoftWrap: {
          set: function() {
              if (this.$useWrapMode) {
                  this.$useWrapMode = false;
                  this.setUseWrapMode(true);
              }
          },
          initialValue: true 
      },
      firstLineNumber: {
          set: function() {this._signal("changeBreakpoint");},
          initialValue: 1
      },
      useWorker: {
          set: function(useWorker) {
              this.$useWorker = useWorker;
  
              this.$stopWorker();
              if (useWorker)
                  this.$startWorker();
          },
          initialValue: true
      },
      useSoftTabs: {initialValue: true},
      tabSize: {
          set: function(tabSize) {
              tabSize = parseInt(tabSize);
              if (tabSize > 0 && this.$tabSize !== tabSize) {
                  this.$modified = true;
                  this.$rowLengthCache = [];
                  this.$tabSize = tabSize;
                  this._signal("changeTabSize");
              }
          },
          initialValue: 4,
          handlesSet: true
      },
      navigateWithinSoftTabs: {initialValue: false},
      foldStyle: {
          set: function(val) {this.setFoldStyle(val);},
          handlesSet: true
      },
      overwrite: {
          set: function(val) {this._signal("changeOverwrite");},
          initialValue: false
      },
      newLineMode: {
          set: function(val) {this.doc.setNewLineMode(val);},
          get: function() {return this.doc.getNewLineMode();},
          handlesSet: true
      },
      mode: {
          set: function(val) { this.setMode(val); },
          get: function() { return this.$modeId; },
          handlesSet: true
      }
  });
  
  exports.EditSession = EditSession;
  });
  