// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: https://codemirror.net/5/LICENSE

/**
 * Supported keybindings:
 *   Too many to list. Refer to defaultKeymap below.
 *
 * Supported Ex commands:
 *   Refer to defaultExCommandMap below.
 *
 * Registers: unnamed, -, ., :, /, _, a-z, A-Z, 0-9
 *   (Does not respect the special case for number registers when delete
 *    operator is made with these commands: %, (, ),  , /, ?, n, N, {, } )
 *   TODO: Implement the remaining registers.
 *
 * Marks: a-z, A-Z, and 0-9
 *   TODO: Implement the remaining special marks. They have more complex
 *       behavior.
 *
 * Events:
 *  'vim-mode-change' - raised on the editor anytime the current mode changes,
 *                      Event object: {mode: "visual", subMode: "linewise"}
 *
 * Code structure:
 *  1. Default keymap
 *  2. Variable declarations and short basic helpers
 *  3. Instance (External API) implementation
 *  4. Internal state tracking objects (input state, counter) implementation
 *     and instantiation
 *  5. Key handler (the main command dispatcher) implementation
 *  6. Motion, operator, and action implementations
 *  7. Helper functions for the key handler, motions, operators, and actions
 *  8. Set up Vim to work as a keymap for CodeMirror.
 *  9. Ex command implementations.
 */

  'use strict';

  function log() {
    var d = "";
    function format(p) {
      if (typeof p != "object")
        return p + "";
      if ("line" in p) {
        return p.line + ":" + p.ch;
      }
      if ("anchor" in p) {
        return format(p.anchor) + "->" + format(p.head);
      }
      if (Array.isArray(p))
        return "[" + p.map(function(x) {
          return format(x);
        }) + "]";
      return JSON.stringify(p);
    }
    for (var i = 0; i < arguments.length; i++) {
      var p = arguments[i];
      var f = format(p);
      d += f + "  ";
    }
    console.log(d);
  }
  var Range = require("../range").Range;
  var EventEmitter = require("../lib/event_emitter").EventEmitter;
  var domLib = require("../lib/dom");
  var oop = require("../lib/oop");
  var KEYS = require("../lib/keys");
  var event = require("../lib/event");
  var Search = require("../search").Search;
  var useragent = require("../lib/useragent");
  var SearchHighlight = require("../search_highlight").SearchHighlight;
  var multiSelectCommands = require("../commands/multi_select_commands");
  var TextModeTokenRe = require("../mode/text").Mode.prototype.tokenRe;
  var hardWrap = require("../ext/hardwrap").hardWrap;
  require("../multi_select");

  var CodeMirror = function(ace) {
    this.ace = ace;
    this.state = {};
    this.marks = {};
    this.options = {};
    this.$uid = 0;
    this.onChange = this.onChange.bind(this);
    this.onSelectionChange = this.onSelectionChange.bind(this);
    this.onBeforeEndOperation = this.onBeforeEndOperation.bind(this);
    this.ace.on('change', this.onChange);
    this.ace.on('changeSelection', this.onSelectionChange);
    this.ace.on('beforeEndOperation', this.onBeforeEndOperation);
  };
  CodeMirror.Pos = function(line, ch) {
    if (!(this instanceof Pos)) return new Pos(line, ch);
    this.line = line; this.ch = ch;
  };
  CodeMirror.defineOption = function(name, val, setter) {};
  CodeMirror.commands = {
    redo: function(cm) { cm.ace.redo(); },
    undo: function(cm) { cm.ace.undo(); },
    newlineAndIndent: function(cm) { cm.ace.insert("\n"); },
    goLineLeft: function(cm) { cm.ace.selection.moveCursorLineStart(); },
    goLineRight: function(cm) { cm.ace.selection.moveCursorLineEnd(); }
  };
  CodeMirror.keyMap = {};
  CodeMirror.addClass = CodeMirror.rmClass = function() {};
  CodeMirror.e_stop = CodeMirror.e_preventDefault = event.stopEvent;
  CodeMirror.keyName = function(e) {
    var key = (KEYS[e.keyCode] || e.key || "");
    if (key.length == 1) key = key.toUpperCase();
    key = event.getModifierString(e).replace(/(^|-)\w/g, function(m) {
      return m.toUpperCase();
    }) + key;
    return key;
  };
  CodeMirror.keyMap['default'] = function(key) {
    return function(cm) {
      var cmd = cm.ace.commands.commandKeyBinding[key.toLowerCase()];
      return cmd && cm.ace.execCommand(cmd) !== false;
    };
  };
  CodeMirror.lookupKey = function lookupKey(key, map, handle) {
    if (!map) map = "default";
    if (typeof map == "string")
      map = CodeMirror.keyMap[map] ||  CodeMirror.keyMap['default'];
    var found = typeof map == "function" ? map(key) : map[key];
    if (found === false) return "nothing";
    if (found === "...") return "multi";
    if (found != null && handle(found)) return "handled";

    if (map.fallthrough) {
      if (!Array.isArray(map.fallthrough))
        return lookupKey(key, map.fallthrough, handle);
      for (var i = 0; i < map.fallthrough.length; i++) {
        var result = lookupKey(key, map.fallthrough[i], handle);
        if (result) return result;
      }
    }
  };


  CodeMirror.findMatchingTag = function (cm, head) {
    return cm.findMatchingTag(head);
  }

  CodeMirror.findEnclosingTag = function (cm, head) {

  };

  CodeMirror.signal = function(o, name, e) { return o._signal(name, e) };
  CodeMirror.on = event.addListener;
  CodeMirror.off = event.removeListener;
  CodeMirror.isWordChar = function(ch) {
    if (ch < "\x7f") return /^\w$/.test(ch);
    TextModeTokenRe.lastIndex = 0;
    return TextModeTokenRe.test(ch);
  };

(function() {
  oop.implement(CodeMirror.prototype, EventEmitter);

  this.destroy = function() {
    this.ace.off('change', this.onChange);
    this.ace.off('changeSelection', this.onSelectionChange);
    this.ace.off('beforeEndOperation', this.onBeforeEndOperation);
    this.removeOverlay();
  };
  this.virtualSelectionMode = function() {
    return this.ace.inVirtualSelectionMode && this.ace.selection.index;
  };
  this.onChange = function(delta) {
    if (this.$lineHandleChanges) {
      this.$lineHandleChanges.push(delta);
    }
    var change = { text: delta.action[0] == 'i' ? delta.lines : [] };
    var curOp = this.curOp = this.curOp || {};
    if (!curOp.changeHandlers)
      curOp.changeHandlers = this._eventRegistry["change"] && this._eventRegistry["change"].slice();
    if (!curOp.lastChange) {
      curOp.lastChange = curOp.change = change;
    } else {
      curOp.lastChange.next = curOp.lastChange = change;
    }
    this.$updateMarkers(delta);
  };
  this.onSelectionChange = function() {
    var curOp = this.curOp = this.curOp || {};
    if (!curOp.cursorActivityHandlers)
      curOp.cursorActivityHandlers = this._eventRegistry["cursorActivity"] && this._eventRegistry["cursorActivity"].slice();
    this.curOp.cursorActivity = true;
    if (this.ace.inMultiSelectMode) {
      this.ace.keyBinding.removeKeyboardHandler(multiSelectCommands.keyboardHandler);
    }
  };
  this.operation = function(fn, force) {
    if (!force && this.curOp || force && this.curOp && this.curOp.force) {
      return fn();
    }
    if (force || !this.ace.curOp) {
      if (this.curOp)
        this.onBeforeEndOperation();
    }
    if (!this.ace.curOp) {
      var prevOp = this.ace.prevOp;
      this.ace.startOperation({
        command: { name: "vim",  scrollIntoView: "cursor" }
      });
    }
    var curOp = this.curOp = this.curOp || {};
    this.curOp.force = force;
    var result = fn();
    if (this.ace.curOp && this.ace.curOp.command.name == "vim") {
      if (this.state.dialog)
        this.ace.curOp.command.scrollIntoView = this.ace.curOp.vimDialogScroll;
      this.ace.endOperation();
      if (!curOp.cursorActivity && !curOp.lastChange && prevOp)
        this.ace.prevOp = prevOp;
    }
    if (force || !this.ace.curOp) {
      if (this.curOp)
        this.onBeforeEndOperation();
    }
    return result;
  };
  this.onBeforeEndOperation = function() {
    var op = this.curOp;
    if (op) {
      if (op.change) { this.signal("change", op.change, op); }
      if (op && op.cursorActivity) { this.signal("cursorActivity", null, op); }
      this.curOp = null;
    }
  };

  this.signal = function(eventName, e, handlers) {
    var listeners = handlers ? handlers[eventName + "Handlers"]
        : (this._eventRegistry || {})[eventName];
    if (!listeners)
        return;
    listeners = listeners.slice();
    for (var i=0; i<listeners.length; i++)
        listeners[i](this, e);
  };
  this.firstLine = function() { return 0; };
  this.lastLine = function() { return this.ace.session.getLength() - 1; };
  this.lineCount = function() { return this.ace.session.getLength(); };
  this.setCursor = function(line, ch) {
    if (typeof line === 'object') {
      ch = line.ch;
      line = line.line;
    }
    var shouldScroll = !this.curOp && !this.ace.inVirtualSelectionMode;
    if (!this.ace.inVirtualSelectionMode)
      this.ace.exitMultiSelectMode();
    this.ace.session.unfold({row: line, column: ch});
    this.ace.selection.moveTo(line, ch);
    if (shouldScroll) {
      this.ace.renderer.scrollCursorIntoView();
      this.ace.endOperation();
    }
  };
  this.getCursor = function(p) {
    var sel = this.ace.selection;
    var pos = p == 'anchor' ? (sel.isEmpty() ? sel.lead : sel.anchor) :
        p == 'head' || !p ? sel.lead : sel.getRange()[p];
    return toCmPos(pos);
  };
  this.listSelections = function(p) {
    var ranges = this.ace.multiSelect.rangeList.ranges;
    if (!ranges.length || this.ace.inVirtualSelectionMode)
      return [{anchor: this.getCursor('anchor'), head: this.getCursor('head')}];
    return ranges.map(function(r) {
      return {
        anchor: this.clipPos(toCmPos(r.cursor == r.end ? r.start : r.end)),
        head: this.clipPos(toCmPos(r.cursor))
      };
    }, this);
  };
  this.setSelections = function(p, primIndex) {
    var sel = this.ace.multiSelect;
    var ranges = p.map(function(x) {
      var anchor = toAcePos(x.anchor);
      var head = toAcePos(x.head);
      var r = Range.comparePoints(anchor, head) < 0
        ? new Range.fromPoints(anchor, head)
        : new Range.fromPoints(head, anchor);
      r.cursor = Range.comparePoints(r.start, head) ? r.end : r.start;
      return r;
    });

    if (this.ace.inVirtualSelectionMode) {
      this.ace.selection.fromOrientedRange(ranges[0]);
      return;
    }
    if (!primIndex) {
        ranges = ranges.reverse();
    } else if (ranges[primIndex]) {
       ranges.push(ranges.splice(primIndex, 1)[0]);
    }
    sel.toSingleRange(ranges[0].clone());
    var session = this.ace.session;
    for (var i = 0; i < ranges.length; i++) {
      var range = session.$clipRangeToDocument(ranges[i]); // todo why ace doesn't do this?
      sel.addRange(range);
    }
  };
  this.setSelection = function(a, h, options) {
    var sel = this.ace.selection;
    sel.moveTo(a.line, a.ch);
    sel.selectTo(h.line, h.ch);
    if (options && options.origin == '*mouse') {
      this.onBeforeEndOperation();
    }
  };
  this.somethingSelected = function(p) {
    return !this.ace.selection.isEmpty();
  };
  this.clipPos = function(p) {
    var pos = this.ace.session.$clipPositionToDocument(p.line, p.ch);
    return toCmPos(pos);
  };
  this.foldCode = function(pos) {
    this.ace.session.$toggleFoldWidget(pos.line, {});
  };
  this.markText = function(cursor) {
    // only used for fat-cursor, not needed
    return {clear: function() {}, find: function() {}};
  };
  this.$updateMarkers = function(delta) {
    var isInsert = delta.action == "insert";
    var start = delta.start;
    var end = delta.end;
    var rowShift = (end.row - start.row) * (isInsert ? 1 : -1);
    var colShift = (end.column - start.column) * (isInsert ? 1 : -1);
    if (isInsert) end = start;

    for (var i in this.marks) {
      var point = this.marks[i];
      var cmp = Range.comparePoints(point, start);
      if (cmp < 0) {
        continue; // delta starts after the range
      }
      if (cmp === 0) {
        if (isInsert) {
          if (!point.$insertRight) {
            cmp = 1;
          }
          else if (point.bias == 1) {
            cmp = 1;
          } else {
            point.bias = -1;
            continue;
          }
        }
      }
      var cmp2 = isInsert ? cmp : Range.comparePoints(point, end);
      if (cmp2 > 0) {
        point.row += rowShift;
        point.column += point.row == end.row ? colShift : 0;
        continue;
      }
      if (!isInsert && cmp2 <= 0) {
        point.row = start.row;
        point.column = start.column;
        if (cmp2 === 0)
          point.bias = 1;
      }
    }
  };
  var Marker = function(cm, id, row, column) {
    this.cm = cm;
    this.id = id;
    this.row = row;
    this.column = column;
    cm.marks[this.id] = this;
  };
  Marker.prototype.clear = function() { delete this.cm.marks[this.id] };
  Marker.prototype.find = function() { return toCmPos(this) };
  this.setBookmark = function(cursor, options) {
    var bm = new Marker(this, this.$uid++, cursor.line, cursor.ch);
    if (!options || !options.insertLeft)
      bm.$insertRight = true;
    this.marks[bm.id] = bm;
    return bm;
  };
  this.moveH = function(increment, unit) {
    if (unit == 'char') {
      var sel = this.ace.selection;
      sel.clearSelection();
      sel.moveCursorBy(0, increment);
    }
  };
  this.findPosV = function(start, amount, unit, goalColumn) {
    if (unit == 'page') {
      var renderer = this.ace.renderer;
      var config = renderer.layerConfig;
      amount = amount * Math.floor(config.height / config.lineHeight);
      unit = 'line';
    }
    if (unit == 'line') {
      var screenPos = this.ace.session.documentToScreenPosition(start.line, start.ch);
      if (goalColumn != null)
        screenPos.column = goalColumn;
      screenPos.row += amount;
      // not what codemirror does but vim mode needs only this
      screenPos.row = Math.min(Math.max(0, screenPos.row), this.ace.session.getScreenLength() - 1);
      var pos = this.ace.session.screenToDocumentPosition(screenPos.row, screenPos.column);
      return toCmPos(pos);
    } else {
      debugger;
    }
  };
  this.charCoords = function(pos, mode) {
    if (mode == 'div' || !mode) {
      var sc = this.ace.session.documentToScreenPosition(pos.line, pos.ch);
      return {left: sc.column, top: sc.row};
    }if (mode == 'local') {
      var renderer = this.ace.renderer;
      var sc = this.ace.session.documentToScreenPosition(pos.line, pos.ch);
      var lh = renderer.layerConfig.lineHeight;
      var cw = renderer.layerConfig.characterWidth;
      var top = lh * sc.row;
      return {left: sc.column * cw, top: top, bottom: top + lh};
    }
  };
  this.coordsChar = function(pos, mode) {
    var renderer = this.ace.renderer;
    if (mode == 'local') {
      var row = Math.max(0, Math.floor(pos.top / renderer.lineHeight));
      var col = Math.max(0, Math.floor(pos.left / renderer.characterWidth));
      var ch = renderer.session.screenToDocumentPosition(row, col);
      return toCmPos(ch);
    } else if (mode == 'div') {
      throw "not implemented";
    }
  };
  this.getSearchCursor = function(query, pos, caseFold) {
    var caseSensitive = false;
    var isRegexp = false;
    if (query instanceof RegExp && !query.global) {
      caseSensitive = !query.ignoreCase;
      query = query.source;
      isRegexp = true;
    }
    if (query == "\\n") { query = "\n"; isRegexp = false; }
    var search = new Search();
    if (pos.ch == undefined) pos.ch = Number.MAX_VALUE;
    var acePos = {row: pos.line, column: pos.ch};
    var cm = this;
    var last = null;
    return {
      findNext: function() { return this.find(false) },
      findPrevious: function() {return this.find(true) },
      find: function(back) {
        search.setOptions({
          needle: query,
          caseSensitive: caseSensitive,
          wrap: false,
          backwards: back,
          regExp: isRegexp,
          start: last || acePos
        });
        var range = search.find(cm.ace.session);
        last = range;
        return last && [!last.isEmpty()];
      },
      from: function() { return last && toCmPos(last.start) },
      to: function() { return last && toCmPos(last.end) },
      replace: function(text) {
        if (last) {
          last.end = cm.ace.session.doc.replace(last, text);
        }
      }
    };
  };
  this.scrollTo = function(x, y) {
    var renderer = this.ace.renderer;
    var config = renderer.layerConfig;
    var maxHeight = config.maxHeight;
    maxHeight -= (renderer.$size.scrollerHeight - renderer.lineHeight) * renderer.$scrollPastEnd;
    if (y != null) this.ace.session.setScrollTop(Math.max(0, Math.min(y, maxHeight)));
    if (x != null) this.ace.session.setScrollLeft(Math.max(0, Math.min(x, config.width)));
  };
  this.scrollInfo = function() { return 0; };
  this.scrollIntoView = function(pos, margin) {
    if (pos) {
      var renderer = this.ace.renderer;
      var viewMargin = { "top": 0, "bottom": margin };
      renderer.scrollCursorIntoView(toAcePos(pos),
        (renderer.lineHeight * 2) / renderer.$size.scrollerHeight, viewMargin);
    }
  };
  this.getLine = function(row) { return this.ace.session.getLine(row) };
  this.getRange = function(s, e) {
    return this.ace.session.getTextRange(new Range(s.line, s.ch, e.line, e.ch));
  };
  this.replaceRange = function(text, s, e) {
    if (!e) e = s;
    // workaround for session.replace not handling negative rows
    var range = new Range(s.line, s.ch, e.line, e.ch);
    this.ace.session.$clipRangeToDocument(range);
    return this.ace.session.replace(range, text);
  };
  this.replaceSelection =
  this.replaceSelections = function(p) {
    var strings = Array.isArray(p) && p;
    var sel = this.ace.selection;
    if (this.ace.inVirtualSelectionMode) {
      this.ace.session.replace(sel.getRange(), strings ? p[0] || "": p );
      return;
    }
    sel.inVirtualSelectionMode = true;
    var ranges = sel.rangeList.ranges;
    if (!ranges.length) ranges = [this.ace.multiSelect.getRange()];
    for (var i = ranges.length; i--;)
       this.ace.session.replace(ranges[i], strings ? p[i] || "" : p);
    sel.inVirtualSelectionMode = false;
  };
  this.getSelection = function() {
    return this.ace.getSelectedText();
  };
  this.getSelections = function() {
    return this.listSelections().map(function(x) {
      return this.getRange(x.anchor, x.head);
    }, this);
  };
  this.getInputField = function() {
    return this.ace.textInput.getElement();
  };
  this.getWrapperElement = function() {
    return this.ace.container;
  };
  var optMap = {
    indentWithTabs: "useSoftTabs",
    indentUnit: "tabSize",
    tabSize: "tabSize",
    firstLineNumber: "firstLineNumber",
    readOnly: "readOnly"
  };
  this.setOption = function(name, val) {
    this.state[name] = val;
    switch (name) {
      case 'indentWithTabs':
        name = optMap[name];
        val = !val;
      break;
      case 'keyMap':
        this.state.$keyMap = val;
        return;
      break;
      default:
        name = optMap[name];
    }
    if (name)
      this.ace.setOption(name, val);
  };
  this.getOption = function(name) {
    var val;
    var aceOpt = optMap[name];
    if (aceOpt)
      val = this.ace.getOption(aceOpt);
    switch (name) {
      case 'indentWithTabs':
        name = optMap[name];
        return !val;
      case 'keyMap':
        return this.state.$keyMap || 'vim';
    }
    return aceOpt ? val : this.state[name];
  };
  this.toggleOverwrite = function(on) {
    this.state.overwrite = on;
    return this.ace.setOverwrite(on);
  };
  this.addOverlay = function(o) {
    if (!this.$searchHighlight || !this.$searchHighlight.session) {
      var highlight = new SearchHighlight(null, "ace_highlight-marker", "text");
      var marker = this.ace.session.addDynamicMarker(highlight);
      highlight.id = marker.id;
      highlight.session = this.ace.session;
      highlight.destroy = function(o) {
        highlight.session.off("change", highlight.updateOnChange);
        highlight.session.off("changeEditor", highlight.destroy);
        highlight.session.removeMarker(highlight.id);
        highlight.session = null;
      };
      highlight.updateOnChange = function(delta) {
        var row = delta.start.row;
        if (row == delta.end.row) highlight.cache[row] = undefined;
        else highlight.cache.splice(row, highlight.cache.length);
      };
      highlight.session.on("changeEditor", highlight.destroy);
      highlight.session.on("change", highlight.updateOnChange);
    }
    var re = new RegExp(o.query.source, "gmi");
    this.$searchHighlight = o.highlight = highlight;
    this.$searchHighlight.setRegexp(re);
    this.ace.renderer.updateBackMarkers();
  };
  this.removeOverlay = function(o) {
    if (this.$searchHighlight && this.$searchHighlight.session) {
      this.$searchHighlight.destroy();
    }
  };
  this.getScrollInfo = function() {
    var renderer = this.ace.renderer;
    var config = renderer.layerConfig;
    return {
      left: renderer.scrollLeft,
      top: renderer.scrollTop,
      height: config.maxHeight,
      width: config.width,
      clientHeight: config.height,
      clientWidth: config.width
    };
  };
  this.getValue = function() {
    return this.ace.getValue();
  };
  this.setValue = function(v) {
    return this.ace.setValue(v, -1);
  };
  this.getTokenTypeAt = function(pos) {
    var token = this.ace.session.getTokenAt(pos.line, pos.ch);
    return token && /comment|string/.test(token.type) ? "string" : "";
  };
  this.findMatchingBracket = function(pos) {
    var m = this.ace.session.findMatchingBracket(toAcePos(pos));
    return {to: m && toCmPos(m)};
  };
  this.findMatchingTag = function (pos) {
    var m = this.ace.session.getMatchingTags(toAcePos(pos));
    if (!m) return;
    return {
      open: {
        from: toCmPos(m.openTag.start),
        to: toCmPos(m.openTag.end)
      },
      close: {
        from: toCmPos(m.closeTag.start),
        to: toCmPos(m.closeTag.end)
      }
    };
  };
  this.indentLine = function(line, method) {
    if (method === true)
        this.ace.session.indentRows(line, line, "\t");
    else if (method === false)
        this.ace.session.outdentRows(new Range(line, 0, line, 0));
  };
  this.indexFromPos = function(pos) {
    return this.ace.session.doc.positionToIndex(toAcePos(pos));
  };
  this.posFromIndex = function(index) {
    return toCmPos(this.ace.session.doc.indexToPosition(index));
  };
  this.focus = function(index) {
    return this.ace.textInput.focus();
  };
  this.blur = function(index) {
    return this.ace.blur();
  };
  this.defaultTextHeight = function(index) {
    return this.ace.renderer.layerConfig.lineHeight;
  };
  this.scanForBracket = function(pos, dir, _, options) {
    var re = options.bracketRegex.source;
    var tokenRe = /paren|text|operator|tag/;
    if (dir == 1) {
      var m = this.ace.session.$findClosingBracket(re.slice(1, 2), toAcePos(pos), tokenRe);
    } else {
      var m = this.ace.session.$findOpeningBracket(re.slice(-2, -1), {row: pos.line, column: pos.ch + 1}, tokenRe);
      if (!m && options.bracketRegex && options.bracketRegex.test(this.getLine(pos.line)[pos.ch - 1])) {
          m = {row: pos.line, column: pos.ch - 1};
      }
    }
    return m && {pos: toCmPos(m)};
  };
  this.refresh = function() {
    return this.ace.resize(true);
  };
  this.getMode = function() {
    return { name : this.getOption("mode") };
  };
  this.execCommand = function(name) {
    if (CodeMirror.commands.hasOwnProperty(name)) return CodeMirror.commands[name](this);
    if (name == "indentAuto") return this.ace.execCommand("autoindent");
    console.log(name + " is not implemented");
  };
  this.getLineNumber = function(handle) {
    var deltas = this.$lineHandleChanges;
    if (!deltas)
        return null;
    var row = handle.row;
    for (var i = 0; i < deltas.length; i++) {
        var delta = deltas[i];
        if (delta.start.row != delta.end.row) {
            if (delta.action[0] == "i") {
                if (delta.start.row < row)
                    row += delta.end.row - delta.start.row;
            }  else {
                if (delta.start.row < row) {
                    if (row < delta.end.row || row == delta.end.row && delta.start.column > 0) {
                        return null;
                    }
                    row -= delta.end.row - delta.start.row;
                }
            }
        }
    }
    return row;
  };
  this.getLineHandle = function(row) {
    if (!this.$lineHandleChanges)
      this.$lineHandleChanges = [];
    return {text: this.ace.session.getLine(row), row: row};
  };
  this.releaseLineHandles = function() {
    this.$lineHandleChanges = undefined;
  };
  this.getLastEditEnd = function() {
    var undoManager = this.ace.session.$undoManager;
    if (undoManager && undoManager.$lastDelta)
      return toCmPos(undoManager.$lastDelta.end);
  };
}).call(CodeMirror.prototype);
  function toAcePos(cmPos) {
    return {row: cmPos.line, column: cmPos.ch};
  }
  function toCmPos(acePos) {
    return new Pos(acePos.row, acePos.column);
  }

  var StringStream = CodeMirror.StringStream = function(string, tabSize) {
    this.pos = this.start = 0;
    this.string = string;
    this.tabSize = tabSize || 8;
    this.lastColumnPos = this.lastColumnValue = 0;
    this.lineStart = 0;
  };

  StringStream.prototype = {
    eol: function() {return this.pos >= this.string.length;},
    sol: function() {return this.pos == this.lineStart;},
    peek: function() {return this.string.charAt(this.pos) || undefined;},
    next: function() {
      if (this.pos < this.string.length)
        return this.string.charAt(this.pos++);
    },
    eat: function(match) {
      var ch = this.string.charAt(this.pos);
      if (typeof match == "string") var ok = ch == match;
      else var ok = ch && (match.test ? match.test(ch) : match(ch));
      if (ok) {++this.pos; return ch;}
    },
    eatWhile: function(match) {
      var start = this.pos;
      while (this.eat(match)){}
      return this.pos > start;
    },
    eatSpace: function() {
      var start = this.pos;
      while (/[\s\u00a0]/.test(this.string.charAt(this.pos))) ++this.pos;
      return this.pos > start;
    },
    skipToEnd: function() {this.pos = this.string.length;},
    skipTo: function(ch) {
      var found = this.string.indexOf(ch, this.pos);
      if (found > -1) {this.pos = found; return true;}
    },
    backUp: function(n) {this.pos -= n;},
    column: function() {
      throw "not implemented";
    },
    indentation: function() {
      throw "not implemented";
    },
    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;
      }
    },
    current: function(){return this.string.slice(this.start, this.pos);},
    hideFirstChars: function(n, inner) {
      this.lineStart += n;
      try { return inner(); }
      finally { this.lineStart -= n; }
    }
  };

// todo replace with showCommandLine
CodeMirror.defineExtension = function(name, fn) {
  CodeMirror.prototype[name] = fn;
};
domLib.importCssString(`.normal-mode .ace_cursor{
    border: none;
    background-color: rgba(255,0,0,0.5);
}
.normal-mode .ace_hidden-cursors .ace_cursor{
  background-color: transparent;
  border: 1px solid red;
  opacity: 0.7
}
.ace_dialog {
  position: absolute;
  left: 0; right: 0;
  background: inherit;
  z-index: 15;
  padding: .1em .8em;
  overflow: hidden;
  color: inherit;
}
.ace_dialog-top {
  border-bottom: 1px solid #444;
  top: 0;
}
.ace_dialog-bottom {
  border-top: 1px solid #444;
  bottom: 0;
}
.ace_dialog input {
  border: none;
  outline: none;
  background: transparent;
  width: 20em;
  color: inherit;
  font-family: monospace;
}`, "vimMode", false);
(function() {
  function dialogDiv(cm, template, bottom) {
    var wrap = cm.ace.container;
    var dialog;
    dialog = wrap.appendChild(document.createElement("div"));
    if (bottom)
      dialog.className = "ace_dialog ace_dialog-bottom";
    else
      dialog.className = "ace_dialog ace_dialog-top";

    if (typeof template == "string") {
      dialog.innerHTML = template;
    } else { // Assuming it's a detached DOM element.
      dialog.appendChild(template);
    }
    return dialog;
  }

  function closeNotification(cm, newVal) {
    if (cm.state.currentNotificationClose)
      cm.state.currentNotificationClose();
    cm.state.currentNotificationClose = newVal;
  }

  CodeMirror.defineExtension("openDialog", function(template, callback, options) {
    if (this.virtualSelectionMode()) return;
    if (!options) options = {};

    closeNotification(this, null);

    var dialog = dialogDiv(this, template, options.bottom);
    var closed = false, me = this;
    this.state.dialog = dialog;
    function close(newVal) {
      if (typeof newVal == 'string') {
        inp.value = newVal;
      } else {
        if (closed) return;

        if (newVal && newVal.type == "blur") {
          if (document.activeElement === inp)
            return;
        }

        if (me.state.dialog == dialog) {
          me.state.dialog = null;
          me.focus();
        }
        closed = true;
        dialog.remove();

        if (options.onClose) options.onClose(dialog);

        // ace_patch{
        var cm = me;
        if (cm.state.vim) {
          cm.state.vim.status = null;
          cm.ace._signal("changeStatus");
          cm.ace.renderer.$loop.schedule(cm.ace.renderer.CHANGE_CURSOR);
        }
        // ace_patch}
      }
    }

    var inp = dialog.getElementsByTagName("input")[0], button;
    if (inp) {
      if (options.value) {
        inp.value = options.value;
        if (options.selectValueOnOpen !== false) inp.select();
      }

      if (options.onInput)
        CodeMirror.on(inp, "input", function(e) { options.onInput(e, inp.value, close);});
      if (options.onKeyUp)
        CodeMirror.on(inp, "keyup", function(e) {options.onKeyUp(e, inp.value, close);});

      CodeMirror.on(inp, "keydown", function(e) {
        if (options && options.onKeyDown && options.onKeyDown(e, inp.value, close)) { return; }
        if (e.keyCode == 13) callback(inp.value);
        if (e.keyCode == 27 || (options.closeOnEnter !== false && e.keyCode == 13)) {
          CodeMirror.e_stop(e);
          close();
        }
      });

      if (options.closeOnBlur !== false) CodeMirror.on(inp, "blur", close);

      inp.focus();
    } else if (button = dialog.getElementsByTagName("button")[0]) {
      CodeMirror.on(button, "click", function() {
        close();
        me.focus();
      });

      if (options.closeOnBlur !== false) CodeMirror.on(button, "blur", close);

      button.focus();
    }
    return close;
  });

  CodeMirror.defineExtension("openNotification", function(template, options) {
    if (this.virtualSelectionMode()) return;
    closeNotification(this, close);
    var dialog = dialogDiv(this, template, options && options.bottom);
    var closed = false, doneTimer;
    var duration = options && typeof options.duration !== "undefined" ? options.duration : 5000;

    function close() {
      if (closed) return;
      closed = true;
      clearTimeout(doneTimer);
      dialog.remove();
    }

    CodeMirror.on(dialog, 'click', function(e) {
      CodeMirror.e_preventDefault(e);
      close();
    });

    if (duration)
      doneTimer = setTimeout(close, duration);

    return close;
  });
})();


  var Pos = CodeMirror.Pos;

  function updateSelectionForSurrogateCharacters(cm, curStart, curEnd) {
    // start and character position when no selection 
    // is the same in visual mode, and differs in 1 character in normal mode
    if (curStart.line === curEnd.line && curStart.ch >= curEnd.ch - 1) {
      var text = cm.getLine(curStart.line);
      var charCode = text.charCodeAt(curStart.ch);
      if (0xD800 <= charCode && charCode <= 0xD8FF) {
        curEnd.ch += 1;
      }
    }

    return {start: curStart, end: curEnd};
  }

  var defaultKeymap = [
    // Key to key mapping. This goes first to make it possible to override
    // existing mappings.
    { keys: '<Left>', type: 'keyToKey', toKeys: 'h' },
    { keys: '<Right>', type: 'keyToKey', toKeys: 'l' },
    { keys: '<Up>', type: 'keyToKey', toKeys: 'k' },
    { keys: '<Down>', type: 'keyToKey', toKeys: 'j' },
    { keys: 'g<Up>', type: 'keyToKey', toKeys: 'gk' },
    { keys: 'g<Down>', type: 'keyToKey', toKeys: 'gj' },
    { keys: '<Space>', type: 'keyToKey', toKeys: 'l' },
    { keys: '<BS>', type: 'keyToKey', toKeys: 'h'},
    { keys: '<Del>', type: 'keyToKey', toKeys: 'x' },
    { keys: '<C-Space>', type: 'keyToKey', toKeys: 'W' },
    { keys: '<C-BS>', type: 'keyToKey', toKeys: 'B' },
    { keys: '<S-Space>', type: 'keyToKey', toKeys: 'w' },
    { keys: '<S-BS>', type: 'keyToKey', toKeys: 'b' },
    { keys: '<C-n>', type: 'keyToKey', toKeys: 'j' },
    { keys: '<C-p>', type: 'keyToKey', toKeys: 'k' },
    { keys: '<C-[>', type: 'keyToKey', toKeys: '<Esc>' },
    { keys: '<C-c>', type: 'keyToKey', toKeys: '<Esc>' },
    { keys: '<C-[>', type: 'keyToKey', toKeys: '<Esc>', context: 'insert' },
    { keys: '<C-c>', type: 'keyToKey', toKeys: '<Esc>', context: 'insert' },
    { keys: '<C-Esc>', type: 'keyToKey', toKeys: '<Esc>' }, // ipad keyboard sends C-Esc instead of C-[
    { keys: '<C-Esc>', type: 'keyToKey', toKeys: '<Esc>', context: 'insert' },
    { keys: 's', type: 'keyToKey', toKeys: 'cl', context: 'normal' },
    { keys: 's', type: 'keyToKey', toKeys: 'c', context: 'visual'},
    { keys: 'S', type: 'keyToKey', toKeys: 'cc', context: 'normal' },
    { keys: 'S', type: 'keyToKey', toKeys: 'VdO', context: 'visual' },
    { keys: '<Home>', type: 'keyToKey', toKeys: '0' },
    { keys: '<End>', type: 'keyToKey', toKeys: '$' },
    { keys: '<PageUp>', type: 'keyToKey', toKeys: '<C-b>' },
    { keys: '<PageDown>', type: 'keyToKey', toKeys: '<C-f>' },
    { keys: '<CR>', type: 'keyToKey', toKeys: 'j^', context: 'normal' },
    { keys: '<Ins>', type: 'keyToKey', toKeys: 'i', context: 'normal'},
    { keys: '<Ins>', type: 'action', action: 'toggleOverwrite', context: 'insert' },
    // Motions
    { keys: 'H', type: 'motion', motion: 'moveToTopLine', motionArgs: { linewise: true, toJumplist: true }},
    { keys: 'M', type: 'motion', motion: 'moveToMiddleLine', motionArgs: { linewise: true, toJumplist: true }},
    { keys: 'L', type: 'motion', motion: 'moveToBottomLine', motionArgs: { linewise: true, toJumplist: true }},
    { keys: 'h', type: 'motion', motion: 'moveByCharacters', motionArgs: { forward: false }},
    { keys: 'l', type: 'motion', motion: 'moveByCharacters', motionArgs: { forward: true }},
    { keys: 'j', type: 'motion', motion: 'moveByLines', motionArgs: { forward: true, linewise: true }},
    { keys: 'k', type: 'motion', motion: 'moveByLines', motionArgs: { forward: false, linewise: true }},
    { keys: 'gj', type: 'motion', motion: 'moveByDisplayLines', motionArgs: { forward: true }},
    { keys: 'gk', type: 'motion', motion: 'moveByDisplayLines', motionArgs: { forward: false }},
    { keys: 'w', type: 'motion', motion: 'moveByWords', motionArgs: { forward: true, wordEnd: false }},
    { keys: 'W', type: 'motion', motion: 'moveByWords', motionArgs: { forward: true, wordEnd: false, bigWord: true }},
    { keys: 'e', type: 'motion', motion: 'moveByWords', motionArgs: { forward: true, wordEnd: true, inclusive: true }},
    { keys: 'E', type: 'motion', motion: 'moveByWords', motionArgs: { forward: true, wordEnd: true, bigWord: true, inclusive: true }},
    { keys: 'b', type: 'motion', motion: 'moveByWords', motionArgs: { forward: false, wordEnd: false }},
    { keys: 'B', type: 'motion', motion: 'moveByWords', motionArgs: { forward: false, wordEnd: false, bigWord: true }},
    { keys: 'ge', type: 'motion', motion: 'moveByWords', motionArgs: { forward: false, wordEnd: true, inclusive: true }},
    { keys: 'gE', type: 'motion', motion: 'moveByWords', motionArgs: { forward: false, wordEnd: true, bigWord: true, inclusive: true }},
    { keys: '{', type: 'motion', motion: 'moveByParagraph', motionArgs: { forward: false, toJumplist: true }},
    { keys: '}', type: 'motion', motion: 'moveByParagraph', motionArgs: { forward: true, toJumplist: true }},
    { keys: '(', type: 'motion', motion: 'moveBySentence', motionArgs: { forward: false }},
    { keys: ')', type: 'motion', motion: 'moveBySentence', motionArgs: { forward: true }},
    { keys: '<C-f>', type: 'motion', motion: 'moveByPage', motionArgs: { forward: true }},
    { keys: '<C-b>', type: 'motion', motion: 'moveByPage', motionArgs: { forward: false }},
    { keys: '<C-d>', type: 'motion', motion: 'moveByScroll', motionArgs: { forward: true, explicitRepeat: true }},
    { keys: '<C-u>', type: 'motion', motion: 'moveByScroll', motionArgs: { forward: false, explicitRepeat: true }},
    { keys: 'gg', type: 'motion', motion: 'moveToLineOrEdgeOfDocument', motionArgs: { forward: false, explicitRepeat: true, linewise: true, toJumplist: true }},
    { keys: 'G', type: 'motion', motion: 'moveToLineOrEdgeOfDocument', motionArgs: { forward: true, explicitRepeat: true, linewise: true, toJumplist: true }},
    {keys: "g$", type: "motion", motion: "moveToEndOfDisplayLine"},
    {keys: "g^", type: "motion", motion: "moveToStartOfDisplayLine"},
    {keys: "g0", type: "motion", motion: "moveToStartOfDisplayLine"},
    { keys: '0', type: 'motion', motion: 'moveToStartOfLine' },
    { keys: '^', type: 'motion', motion: 'moveToFirstNonWhiteSpaceCharacter' },
    { keys: '+', type: 'motion', motion: 'moveByLines', motionArgs: { forward: true, toFirstChar:true }},
    { keys: '-', type: 'motion', motion: 'moveByLines', motionArgs: { forward: false, toFirstChar:true }},
    { keys: '_', type: 'motion', motion: 'moveByLines', motionArgs: { forward: true, toFirstChar:true, repeatOffset:-1 }},
    { keys: '$', type: 'motion', motion: 'moveToEol', motionArgs: { inclusive: true }},
    { keys: '%', type: 'motion', motion: 'moveToMatchedSymbol', motionArgs: { inclusive: true, toJumplist: true }},
    { keys: 'f<character>', type: 'motion', motion: 'moveToCharacter', motionArgs: { forward: true , inclusive: true }},
    { keys: 'F<character>', type: 'motion', motion: 'moveToCharacter', motionArgs: { forward: false }},
    { keys: 't<character>', type: 'motion', motion: 'moveTillCharacter', motionArgs: { forward: true, inclusive: true }},
    { keys: 'T<character>', type: 'motion', motion: 'moveTillCharacter', motionArgs: { forward: false }},
    { keys: ';', type: 'motion', motion: 'repeatLastCharacterSearch', motionArgs: { forward: true }},
    { keys: ',', type: 'motion', motion: 'repeatLastCharacterSearch', motionArgs: { forward: false }},
    { keys: '\'<register>', type: 'motion', motion: 'goToMark', motionArgs: {toJumplist: true, linewise: true}},
    { keys: '`<register>', type: 'motion', motion: 'goToMark', motionArgs: {toJumplist: true}},
    { keys: ']`', type: 'motion', motion: 'jumpToMark', motionArgs: { forward: true } },
    { keys: '[`', type: 'motion', motion: 'jumpToMark', motionArgs: { forward: false } },
    { keys: ']\'', type: 'motion', motion: 'jumpToMark', motionArgs: { forward: true, linewise: true } },
    { keys: '[\'', type: 'motion', motion: 'jumpToMark', motionArgs: { forward: false, linewise: true } },
    // the next two aren't motions but must come before more general motion declarations
    { keys: ']p', type: 'action', action: 'paste', isEdit: true, actionArgs: { after: true, isEdit: true, matchIndent: true}},
    { keys: '[p', type: 'action', action: 'paste', isEdit: true, actionArgs: { after: false, isEdit: true, matchIndent: true}},
    { keys: ']<character>', type: 'motion', motion: 'moveToSymbol', motionArgs: { forward: true, toJumplist: true}},
    { keys: '[<character>', type: 'motion', motion: 'moveToSymbol', motionArgs: { forward: false, toJumplist: true}},
    { keys: '|', type: 'motion', motion: 'moveToColumn'},
    { keys: 'o', type: 'motion', motion: 'moveToOtherHighlightedEnd', context:'visual'},
    { keys: 'O', type: 'motion', motion: 'moveToOtherHighlightedEnd', motionArgs: {sameLine: true}, context:'visual'},
    // Operators
    { keys: 'd', type: 'operator', operator: 'delete' },
    { keys: 'y', type: 'operator', operator: 'yank' },
    { keys: 'c', type: 'operator', operator: 'change' },
    { keys: '=', type: 'operator', operator: 'indentAuto' },
    { keys: '>', type: 'operator', operator: 'indent', operatorArgs: { indentRight: true }},
    { keys: '<', type: 'operator', operator: 'indent', operatorArgs: { indentRight: false }},
    { keys: 'g~', type: 'operator', operator: 'changeCase' },
    { keys: 'gu', type: 'operator', operator: 'changeCase', operatorArgs: {toLower: true}, isEdit: true },
    { keys: 'gU', type: 'operator', operator: 'changeCase', operatorArgs: {toLower: false}, isEdit: true },
    { keys: 'n', type: 'motion', motion: 'findNext', motionArgs: { forward: true, toJumplist: true }},
    { keys: 'N', type: 'motion', motion: 'findNext', motionArgs: { forward: false, toJumplist: true }},
    { keys: 'gn', type: 'motion', motion: 'findAndSelectNextInclusive', motionArgs: { forward: true }},
    { keys: 'gN', type: 'motion', motion: 'findAndSelectNextInclusive', motionArgs: { forward: false }},
    { keys: 'gq', type: 'operator', operator: 'hardWrap' },
    { keys: 'gw', type: 'operator', operator: 'hardWrap', operatorArgs: {keepCursor: true}},
    // Operator-Motion dual commands
    { keys: 'x', type: 'operatorMotion', operator: 'delete', motion: 'moveByCharacters', motionArgs: { forward: true }, operatorMotionArgs: { visualLine: false }},
    { keys: 'X', type: 'operatorMotion', operator: 'delete', motion: 'moveByCharacters', motionArgs: { forward: false }, operatorMotionArgs: { visualLine: true }},
    { keys: 'D', type: 'operatorMotion', operator: 'delete', motion: 'moveToEol', motionArgs: { inclusive: true }, context: 'normal'},
    { keys: 'D', type: 'operator', operator: 'delete', operatorArgs: { linewise: true }, context: 'visual'},
    { keys: 'Y', type: 'operatorMotion', operator: 'yank', motion: 'expandToLine', motionArgs: { linewise: true }, context: 'normal'},
    { keys: 'Y', type: 'operator', operator: 'yank', operatorArgs: { linewise: true }, context: 'visual'},
    { keys: 'C', type: 'operatorMotion', operator: 'change', motion: 'moveToEol', motionArgs: { inclusive: true }, context: 'normal'},
    { keys: 'C', type: 'operator', operator: 'change', operatorArgs: { linewise: true }, context: 'visual'},
    { keys: '~', type: 'operatorMotion', operator: 'changeCase', motion: 'moveByCharacters', motionArgs: { forward: true }, operatorArgs: { shouldMoveCursor: true }, context: 'normal'},
    { keys: '~', type: 'operator', operator: 'changeCase', context: 'visual'},
    { keys: '<C-u>', type: 'operatorMotion', operator: 'delete', motion: 'moveToStartOfLine', context: 'insert' },
    { keys: '<C-w>', type: 'operatorMotion', operator: 'delete', motion: 'moveByWords', motionArgs: { forward: false, wordEnd: false }, context: 'insert' },
    //ignore C-w in normal mode
    { keys: '<C-w>', type: 'idle', context: 'normal' },
    // Actions
    { keys: '<C-i>', type: 'action', action: 'jumpListWalk', actionArgs: { forward: true }},
    { keys: '<C-o>', type: 'action', action: 'jumpListWalk', actionArgs: { forward: false }},
    { keys: '<C-e>', type: 'action', action: 'scroll', actionArgs: { forward: true, linewise: true }},
    { keys: '<C-y>', type: 'action', action: 'scroll', actionArgs: { forward: false, linewise: true }},
    { keys: 'a', type: 'action', action: 'enterInsertMode', isEdit: true, actionArgs: { insertAt: 'charAfter' }, context: 'normal' },
    { keys: 'A', type: 'action', action: 'enterInsertMode', isEdit: true, actionArgs: { insertAt: 'eol' }, context: 'normal' },
    { keys: 'A', type: 'action', action: 'enterInsertMode', isEdit: true, actionArgs: { insertAt: 'endOfSelectedArea' }, context: 'visual' },
    { keys: 'i', type: 'action', action: 'enterInsertMode', isEdit: true, actionArgs: { insertAt: 'inplace' }, context: 'normal' },
    { keys: 'gi', type: 'action', action: 'enterInsertMode', isEdit: true, actionArgs: { insertAt: 'lastEdit' }, context: 'normal' },
    { keys: 'I', type: 'action', action: 'enterInsertMode', isEdit: true, actionArgs: { insertAt: 'firstNonBlank'}, context: 'normal' },
    { keys: 'gI', type: 'action', action: 'enterInsertMode', isEdit: true, actionArgs: { insertAt: 'bol'}, context: 'normal' },
    { keys: 'I', type: 'action', action: 'enterInsertMode', isEdit: true, actionArgs: { insertAt: 'startOfSelectedArea' }, context: 'visual' },
    { keys: 'o', type: 'action', action: 'newLineAndEnterInsertMode', isEdit: true, interlaceInsertRepeat: true, actionArgs: { after: true }, context: 'normal' },
    { keys: 'O', type: 'action', action: 'newLineAndEnterInsertMode', isEdit: true, interlaceInsertRepeat: true, actionArgs: { after: false }, context: 'normal' },
    { keys: 'v', type: 'action', action: 'toggleVisualMode' },
    { keys: 'V', type: 'action', action: 'toggleVisualMode', actionArgs: { linewise: true }},
    { keys: '<C-v>', type: 'action', action: 'toggleVisualMode', actionArgs: { blockwise: true }},
    { keys: '<C-q>', type: 'action', action: 'toggleVisualMode', actionArgs: { blockwise: true }},
    { keys: 'gv', type: 'action', action: 'reselectLastSelection' },
    { keys: 'J', type: 'action', action: 'joinLines', isEdit: true },
    { keys: 'gJ', type: 'action', action: 'joinLines', actionArgs: { keepSpaces: true }, isEdit: true },
    { keys: 'p', type: 'action', action: 'paste', isEdit: true, actionArgs: { after: true, isEdit: true }},
    { keys: 'P', type: 'action', action: 'paste', isEdit: true, actionArgs: { after: false, isEdit: true }},
    { keys: 'r<character>', type: 'action', action: 'replace', isEdit: true },
    { keys: '@<register>', type: 'action', action: 'replayMacro' },
    { keys: 'q<register>', type: 'action', action: 'enterMacroRecordMode' },
    // Handle Replace-mode as a special case of insert mode.
    { keys: 'R', type: 'action', action: 'enterInsertMode', isEdit: true, actionArgs: { replace: true }, context: 'normal'},
    { keys: 'R', type: 'operator', operator: 'change', operatorArgs: { linewise: true, fullLine: true }, context: 'visual', exitVisualBlock: true},
    { keys: 'u', type: 'action', action: 'undo', context: 'normal' },
    { keys: 'u', type: 'operator', operator: 'changeCase', operatorArgs: {toLower: true}, context: 'visual', isEdit: true },
    { keys: 'U', type: 'operator', operator: 'changeCase', operatorArgs: {toLower: false}, context: 'visual', isEdit: true },
    { keys: '<C-r>', type: 'action', action: 'redo' },
    { keys: 'm<register>', type: 'action', action: 'setMark' },
    { keys: '"<register>', type: 'action', action: 'setRegister' },
    { keys: '<C-r><register>', type: 'action', action: 'insertRegister', context: 'insert', isEdit: true },
    { keys: '<C-o>', type: 'action', action: 'oneNormalCommand', context: 'insert' },
    { keys: 'zz', type: 'action', action: 'scrollToCursor', actionArgs: { position: 'center' }},
    { keys: 'z.', type: 'action', action: 'scrollToCursor', actionArgs: { position: 'center' }, motion: 'moveToFirstNonWhiteSpaceCharacter' },
    { keys: 'zt', type: 'action', action: 'scrollToCursor', actionArgs: { position: 'top' }},
    { keys: 'z<CR>', type: 'action', action: 'scrollToCursor', actionArgs: { position: 'top' }, motion: 'moveToFirstNonWhiteSpaceCharacter' },
    { keys: 'zb', type: 'action', action: 'scrollToCursor', actionArgs: { position: 'bottom' }},
    { keys: 'z-', type: 'action', action: 'scrollToCursor', actionArgs: { position: 'bottom' }, motion: 'moveToFirstNonWhiteSpaceCharacter' },
    { keys: '.', type: 'action', action: 'repeatLastEdit' },
    { keys: '<C-a>', type: 'action', action: 'incrementNumberToken', isEdit: true, actionArgs: {increase: true, backtrack: false}},
    { keys: '<C-x>', type: 'action', action: 'incrementNumberToken', isEdit: true, actionArgs: {increase: false, backtrack: false}},
    { keys: '<C-t>', type: 'action', action: 'indent', actionArgs: { indentRight: true }, context: 'insert' },
    { keys: '<C-d>', type: 'action', action: 'indent', actionArgs: { indentRight: false }, context: 'insert' },
    // Text object motions
    { keys: 'a<register>', type: 'motion', motion: 'textObjectManipulation' },
    { keys: 'i<register>', type: 'motion', motion: 'textObjectManipulation', motionArgs: { textObjectInner: true }},
    // Search
    { keys: '/', type: 'search', searchArgs: { forward: true, querySrc: 'prompt', toJumplist: true }},
    { keys: '?', type: 'search', searchArgs: { forward: false, querySrc: 'prompt', toJumplist: true }},
    { keys: '*', type: 'search', searchArgs: { forward: true, querySrc: 'wordUnderCursor', wholeWordOnly: true, toJumplist: true }},
    { keys: '#', type: 'search', searchArgs: { forward: false, querySrc: 'wordUnderCursor', wholeWordOnly: true, toJumplist: true }},
    { keys: 'g*', type: 'search', searchArgs: { forward: true, querySrc: 'wordUnderCursor', toJumplist: true }},
    { keys: 'g#', type: 'search', searchArgs: { forward: false, querySrc: 'wordUnderCursor', toJumplist: true }},
    // Ex command
    { keys: ':', type: 'ex' }
  ];
  var defaultKeymapLength = defaultKeymap.length;

  /**
   * Ex commands
   * Care must be taken when adding to the default Ex command map. For any
   * pair of commands that have a shared prefix, at least one of their
   * shortNames must not match the prefix of the other command.
   */
  var defaultExCommandMap = [
    { name: 'colorscheme', shortName: 'colo' },
    { name: 'map' },
    { name: 'imap', shortName: 'im' },
    { name: 'nmap', shortName: 'nm' },
    { name: 'vmap', shortName: 'vm' },
    { name: 'omap', shortName: 'om' },
    { name: 'noremap', shortName: 'no' },
    { name: 'nnoremap', shortName: 'nn' },
    { name: 'vnoremap', shortName: 'vn' },
    { name: 'inoremap', shortName: 'ino' },
    { name: 'onoremap', shortName: 'ono' },
    { name: 'unmap' },
    { name: 'mapclear', shortName: 'mapc' },
    { name: 'nmapclear', shortName: 'nmapc' },
    { name: 'vmapclear', shortName: 'vmapc' },
    { name: 'imapclear', shortName: 'imapc' },
    { name: 'omapclear', shortName: 'omapc' },
    { name: 'write', shortName: 'w' },
    { name: 'undo', shortName: 'u' },
    { name: 'redo', shortName: 'red' },
    { name: 'set', shortName: 'se' },
    { name: 'setlocal', shortName: 'setl' },
    { name: 'setglobal', shortName: 'setg' },
    { name: 'sort', shortName: 'sor' },
    { name: 'substitute', shortName: 's', possiblyAsync: true },
    { name: 'startinsert', shortName: 'start' },
    { name: 'nohlsearch', shortName: 'noh' },
    { name: 'yank', shortName: 'y' },
    { name: 'delmarks', shortName: 'delm' },
    { name: 'registers', shortName: 'reg', excludeFromCommandHistory: true },
    { name: 'vglobal', shortName: 'v' },
    { name: 'delete', shortName: 'd' },
    { name: 'join', shortName: 'j' },
    { name: 'normal', shortName: 'norm' },
    { name: 'global', shortName: 'g' }
  ];

  /**
   * Langmap
   * Determines how to interpret keystrokes in Normal and Visual mode.
   * Useful for people who use a different keyboard layout than QWERTY
   */
  var langmap = parseLangmap('');

    function enterVimMode(cm) {
      cm.setOption('disableInput', true);
      cm.setOption('showCursorWhenSelecting', false);
      CodeMirror.signal(cm, "vim-mode-change", {mode: "normal"});
      cm.on('cursorActivity', onCursorActivity);
      maybeInitVimState(cm);
      CodeMirror.on(cm.getInputField(), 'paste', getOnPasteFn(cm));
    }

    function leaveVimMode(cm) {
      cm.setOption('disableInput', false);
      cm.off('cursorActivity', onCursorActivity);
      CodeMirror.off(cm.getInputField(), 'paste', getOnPasteFn(cm));
      cm.state.vim = null;
      if (highlightTimeout) clearTimeout(highlightTimeout);
    }

    function getOnPasteFn(cm) {
      var vim = cm.state.vim;
      if (!vim.onPasteFn) {
        vim.onPasteFn = function() {
          if (!vim.insertMode) {
            cm.setCursor(offsetCursor(cm.getCursor(), 0, 1));
            actions.enterInsertMode(cm, {}, vim);
          }
        };
      }
      return vim.onPasteFn;
    }

    var numberRegex = /[\d]/;
    var wordCharTest = [CodeMirror.isWordChar, function(ch) {
      return ch && !CodeMirror.isWordChar(ch) && !/\s/.test(ch);
    }], bigWordCharTest = [function(ch) {
      return /\S/.test(ch);
    }];
    var validMarks = ['<', '>'];
    var validRegisters = ['-', '"', '.', ':', '_', '/', '+'];
    var latinCharRegex = /^\w$/
    var upperCaseChars;
    try { upperCaseChars = new RegExp("^[\\p{Lu}]$", "u"); }
    catch (_) { upperCaseChars = /^[A-Z]$/; }

    function isLine(cm, line) {
      return line >= cm.firstLine() && line <= cm.lastLine();
    }
    function isLowerCase(k) {
      return (/^[a-z]$/).test(k);
    }
    function isMatchableSymbol(k) {
      return '()[]{}'.indexOf(k) != -1;
    }
    function isNumber(k) {
      return numberRegex.test(k);
    }
    function isUpperCase(k) {
      return upperCaseChars.test(k);
    }
    function isWhiteSpaceString(k) {
      return (/^\s*$/).test(k);
    }
    function isEndOfSentenceSymbol(k) {
      return '.?!'.indexOf(k) != -1;
    }
    function inArray(val, arr) {
      for (var i = 0; i < arr.length; i++) {
        if (arr[i] == val) {
          return true;
        }
      }
      return false;
    }

    var options = {};
    function defineOption(name, defaultValue, type, aliases, callback) {
      if (defaultValue === undefined && !callback) {
        throw Error('defaultValue is required unless callback is provided');
      }
      if (!type) { type = 'string'; }
      options[name] = {
        type: type,
        defaultValue: defaultValue,
        callback: callback
      };
      if (aliases) {
        for (var i = 0; i < aliases.length; i++) {
          options[aliases[i]] = options[name];
        }
      }
      if (defaultValue) {
        setOption(name, defaultValue);
      }
    }

    function setOption(name, value, cm, cfg) {
      var option = options[name];
      cfg = cfg || {};
      var scope = cfg.scope;
      if (!option) {
        return new Error('Unknown option: ' + name);
      }
      if (option.type == 'boolean') {
        if (value && value !== true) {
          return new Error('Invalid argument: ' + name + '=' + value);
        } else if (value !== false) {
          // Boolean options are set to true if value is not defined.
          value = true;
        }
      }
      if (option.callback) {
        if (scope !== 'local') {
          option.callback(value, undefined);
        }
        if (scope !== 'global' && cm) {
          option.callback(value, cm);
        }
      } else {
        if (scope !== 'local') {
          option.value = option.type == 'boolean' ? !!value : value;
        }
        if (scope !== 'global' && cm) {
          cm.state.vim.options[name] = {value: value};
        }
      }
    }

    function getOption(name, cm, cfg) {
      var option = options[name];
      cfg = cfg || {};
      var scope = cfg.scope;
      if (!option) {
        return new Error('Unknown option: ' + name);
      }
      if (option.callback) {
        var local = cm && option.callback(undefined, cm);
        if (scope !== 'global' && local !== undefined) {
          return local;
        }
        if (scope !== 'local') {
          return option.callback();
        }
        return;
      } else {
        var local = (scope !== 'global') && (cm && cm.state.vim.options[name]);
        return (local || (scope !== 'local') && option || {}).value;
      }
    }

    defineOption('filetype', undefined, 'string', ['ft'], function(name, cm) {
      // Option is local. Do nothing for global.
      if (cm === undefined) {
        return;
      }
      // The 'filetype' option proxies to the CodeMirror 'mode' option.
      if (name === undefined) {
        var mode = cm.getOption('mode');
        return mode == 'null' ? '' : mode;
      } else {
        var mode = name == '' ? 'null' : name;
        cm.setOption('mode', mode);
      }
    });
    defineOption('textwidth', 80, 'number', ['tw'], function(width, cm) {
      // Option is local. Do nothing for global.
      if (cm === undefined) {
        return;
      }
      // The 'filetype' option proxies to the CodeMirror 'mode' option.
      if (width === undefined) {
        var value = cm.getOption('textwidth');
        return value;
      } else {
        var column = Math.round(width);
        if (column > 1) {
          cm.setOption('textwidth', column);
        }
      }
    });

    var createCircularJumpList = function() {
      var size = 100;
      var pointer = -1;
      var head = 0;
      var tail = 0;
      var buffer = new Array(size);
      function add(cm, oldCur, newCur) {
        var current = pointer % size;
        var curMark = buffer[current];
        function useNextSlot(cursor) {
          var next = ++pointer % size;
          var trashMark = buffer[next];
          if (trashMark) {
            trashMark.clear();
          }
          buffer[next] = cm.setBookmark(cursor);
        }
        if (curMark) {
          var markPos = curMark.find();
          // avoid recording redundant cursor position
          if (markPos && !cursorEqual(markPos, oldCur)) {
            useNextSlot(oldCur);
          }
        } else {
          useNextSlot(oldCur);
        }
        useNextSlot(newCur);
        head = pointer;
        tail = pointer - size + 1;
        if (tail < 0) {
          tail = 0;
        }
      }
      function move(cm, offset) {
        pointer += offset;
        if (pointer > head) {
          pointer = head;
        } else if (pointer < tail) {
          pointer = tail;
        }
        var mark = buffer[(size + pointer) % size];
        // skip marks that are temporarily removed from text buffer
        if (mark && !mark.find()) {
          var inc = offset > 0 ? 1 : -1;
          var newCur;
          var oldCur = cm.getCursor();
          do {
            pointer += inc;
            mark = buffer[(size + pointer) % size];
            // skip marks that are the same as current position
            if (mark &&
                (newCur = mark.find()) &&
                !cursorEqual(oldCur, newCur)) {
              break;
            }
          } while (pointer < head && pointer > tail);
        }
        return mark;
      }
      function find(cm, offset) {
        var oldPointer = pointer;
        var mark = move(cm, offset);
        pointer = oldPointer;
        return mark && mark.find();
      }
      return {
        cachedCursor: undefined, //used for # and * jumps
        add: add,
        find: find,
        move: move
      };
    };

    // Returns an object to track the changes associated insert mode.  It
    // clones the object that is passed in, or creates an empty object one if
    // none is provided.
    var createInsertModeChanges = function(c) {
      if (c) {
        // Copy construction
        return {
          changes: c.changes,
          expectCursorActivityForChange: c.expectCursorActivityForChange
        };
      }
      return {
        // Change list
        changes: [],
        // Set to true on change, false on cursorActivity.
        expectCursorActivityForChange: false
      };
    };

    function MacroModeState() {
      this.latestRegister = undefined;
      this.isPlaying = false;
      this.isRecording = false;
      this.replaySearchQueries = [];
      this.onRecordingDone = undefined;
      this.lastInsertModeChanges = createInsertModeChanges();
    }
    MacroModeState.prototype = {
      exitMacroRecordMode: function() {
        var macroModeState = vimGlobalState.macroModeState;
        if (macroModeState.onRecordingDone) {
          macroModeState.onRecordingDone(); // close dialog
        }
        macroModeState.onRecordingDone = undefined;
        macroModeState.isRecording = false;
      },
      enterMacroRecordMode: function(cm, registerName) {
        var register =
            vimGlobalState.registerController.getRegister(registerName);
        if (register) {
          register.clear();
          this.latestRegister = registerName;
          if (cm.openDialog) {
            var template = dom('span', {class: 'cm-vim-message'}, 'recording @' + registerName);
            this.onRecordingDone = cm.openDialog(template, null, {bottom:true});
          }
          this.isRecording = true;
        }
      }
    };

    function maybeInitVimState(cm) {
      if (!cm.state.vim) {
        // Store instance state in the CodeMirror object.
        cm.state.vim = {
          inputState: new InputState(),
          // Vim's input state that triggered the last edit, used to repeat
          // motions and operators with '.'.
          lastEditInputState: undefined,
          // Vim's action command before the last edit, used to repeat actions
          // with '.' and insert mode repeat.
          lastEditActionCommand: undefined,
          // When using jk for navigation, if you move from a longer line to a
          // shorter line, the cursor may clip to the end of the shorter line.
          // If j is pressed again and cursor goes to the next line, the
          // cursor should go back to its horizontal position on the longer
          // line if it can. This is to keep track of the horizontal position.
          lastHPos: -1,
          // Doing the same with screen-position for gj/gk
          lastHSPos: -1,
          // The last motion command run. Cleared if a non-motion command gets
          // executed in between.
          lastMotion: null,
          marks: {},
          insertMode: false,
          insertModeReturn: false,
          // Repeat count for changes made in insert mode, triggered by key
          // sequences like 3,i. Only exists when insertMode is true.
          insertModeRepeat: undefined,
          visualMode: false,
          // If we are in visual line mode. No effect if visualMode is false.
          visualLine: false,
          visualBlock: false,
          lastSelection: null,
          lastPastedText: null,
          sel: {},
          // Buffer-local/window-local values of vim options.
          options: {},
          // Whether the next character should be interpreted literally
          // Necassary for correct implementation of f<character>, r<character> etc.
          // in terms of langmaps.
          expectLiteralNext: false
        };
      }
      return cm.state.vim;
    }
    var vimGlobalState;
    function resetVimGlobalState() {
      vimGlobalState = {
        // The current search query.
        searchQuery: null,
        // Whether we are searching backwards.
        searchIsReversed: false,
        // Replace part of the last substituted pattern
        lastSubstituteReplacePart: undefined,
        jumpList: createCircularJumpList(),
        macroModeState: new MacroModeState,
        // Recording latest f, t, F or T motion command.
        lastCharacterSearch: {increment:0, forward:true, selectedCharacter:''},
        registerController: new RegisterController({}),
        // search history buffer
        searchHistoryController: new HistoryController(),
        // ex Command history buffer
        exCommandHistoryController : new HistoryController()
      };
      for (var optionName in options) {
        var option = options[optionName];
        option.value = option.defaultValue;
      }
    }

    var lastInsertModeKeyTimer;
    var vimApi = {
      enterVimMode: enterVimMode,
      leaveVimMode: leaveVimMode,
      buildKeyMap: function() {
        // TODO: Convert keymap into dictionary format for fast lookup.
      },
      // Testing hook, though it might be useful to expose the register
      // controller anyway.
      getRegisterController: function() {
        return vimGlobalState.registerController;
      },
      // Testing hook.
      resetVimGlobalState_: resetVimGlobalState,

      // Testing hook.
      getVimGlobalState_: function() {
        return vimGlobalState;
      },

      // Testing hook.
      maybeInitVimState_: maybeInitVimState,

      suppressErrorLogging: false,

      InsertModeKey: InsertModeKey,
      map: function(lhs, rhs, ctx) {
        // Add user defined key bindings.
        exCommandDispatcher.map(lhs, rhs, ctx);
      },
      unmap: function(lhs, ctx) {
        return exCommandDispatcher.unmap(lhs, ctx);
      },
      // Non-recursive map function.
      // NOTE: This will not create mappings to key maps that aren't present
      // in the default key map. See TODO at bottom of function.
      noremap: function(lhs, rhs, ctx) {
        exCommandDispatcher.map(lhs, rhs, ctx, true);
      },
      // Remove all user-defined mappings for the provided context.
      mapclear: function(ctx) {
        // Partition the existing keymap into user-defined and true defaults.
        var actualLength = defaultKeymap.length,
            origLength = defaultKeymapLength;
        var userKeymap = defaultKeymap.slice(0, actualLength - origLength);
        defaultKeymap = defaultKeymap.slice(actualLength - origLength);
        if (ctx) {
          // If a specific context is being cleared, we need to keep mappings
          // from all other contexts.
          for (var i = userKeymap.length - 1; i >= 0; i--) {
            var mapping = userKeymap[i];
            if (ctx !== mapping.context) {
              if (mapping.context) {
                this._mapCommand(mapping);
              } else {
                // `mapping` applies to all contexts so create keymap copies
                // for each context except the one being cleared.
                var contexts = ['normal', 'insert', 'visual'];
                for (var j in contexts) {
                  if (contexts[j] !== ctx) {
                    var newMapping = {};
                    for (var key in mapping) {
                      newMapping[key] = mapping[key];
                    }
                    newMapping.context = contexts[j];
                    this._mapCommand(newMapping);
                  }
                }
              }
            }
          }
        }
      },
      langmap: updateLangmap,
      vimKeyFromEvent: vimKeyFromEvent,
      // TODO: Expose setOption and getOption as instance methods. Need to decide how to namespace
      // them, or somehow make them work with the existing CodeMirror setOption/getOption API.
      setOption: setOption,
      getOption: getOption,
      defineOption: defineOption,
      defineEx: function(name, prefix, func){
        if (!prefix) {
          prefix = name;
        } else if (name.indexOf(prefix) !== 0) {
          throw new Error('(Vim.defineEx) "'+prefix+'" is not a prefix of "'+name+'", command not registered');
        }
        exCommands[name]=func;
        exCommandDispatcher.commandMap_[prefix]={name:name, shortName:prefix, type:'api'};
      },
      handleKey: function (cm, key, origin) {
        var command = this.findKey(cm, key, origin);
        if (typeof command === 'function') {
          return command();
        }
      },
      multiSelectHandleKey: multiSelectHandleKey,

      /**
       * This is the outermost function called by CodeMirror, after keys have
       * been mapped to their Vim equivalents.
       *
       * Finds a command based on the key (and cached keys if there is a
       * multi-key sequence). Returns `undefined` if no key is matched, a noop
       * function if a partial match is found (multi-key), and a function to
       * execute the bound command if a a key is matched. The function always
       * returns true.
       */
      findKey: function(cm, key, origin) {
        var vim = maybeInitVimState(cm);

        function handleMacroRecording() {
          var macroModeState = vimGlobalState.macroModeState;
          if (macroModeState.isRecording) {
            if (key == 'q') {
              macroModeState.exitMacroRecordMode();
              clearInputState(cm);
              return true;
            }
            if (origin != 'mapping') {
              logKey(macroModeState, key);
            }
          }
        }
        function handleEsc() {
          if (key == '<Esc>') {
            if (vim.visualMode) {
              // Get back to normal mode.
              exitVisualMode(cm);
            } else if (vim.insertMode) {
              // Get back to normal mode.
              exitInsertMode(cm);
            } else {
              // We're already in normal mode. Let '<Esc>' be handled normally.
              return;
            }
            clearInputState(cm);
            return true;
          }
        }

        function handleKeyInsertMode() {
          if (handleEsc()) { return true; }
          vim.inputState.keyBuffer.push(key);
          var keys = vim.inputState.keyBuffer.join("");
          var keysAreChars = key.length == 1;
          var match = commandDispatcher.matchCommand(keys, defaultKeymap, vim.inputState, 'insert');
          var changeQueue = vim.inputState.changeQueue;

          if (match.type == 'none') { clearInputState(cm); return false; }
          else if (match.type == 'partial') {
            if (match.expectLiteralNext) vim.expectLiteralNext = true;
            if (lastInsertModeKeyTimer) { window.clearTimeout(lastInsertModeKeyTimer); }
            lastInsertModeKeyTimer = keysAreChars && window.setTimeout(
              function() { if (vim.insertMode && vim.inputState.keyBuffer.length) { clearInputState(cm); } },
              getOption('insertModeEscKeysTimeout'));
            if (keysAreChars) {
              var selections = cm.listSelections();
              if (!changeQueue || changeQueue.removed.length != selections.length)
                changeQueue = vim.inputState.changeQueue = new ChangeQueue;
              changeQueue.inserted += key;
              for (var i = 0; i < selections.length; i++) {
                var from = cursorMin(selections[i].anchor, selections[i].head);
                var to = cursorMax(selections[i].anchor, selections[i].head);
                var text = cm.getRange(from, cm.state.overwrite ? offsetCursor(to, 0, 1) : to);
                changeQueue.removed[i] = (changeQueue.removed[i] || "") + text;
              }
            }
            return !keysAreChars;
          }
          vim.expectLiteralNext = false;

          if (lastInsertModeKeyTimer) { window.clearTimeout(lastInsertModeKeyTimer); }
          if (match.command && changeQueue) {
            var selections = cm.listSelections();
            for (var i = 0; i < selections.length; i++) {
              var here = selections[i].head;
              cm.replaceRange(changeQueue.removed[i] || "", 
                offsetCursor(here, 0, -changeQueue.inserted.length), here, '+input');
            }
            vimGlobalState.macroModeState.lastInsertModeChanges.changes.pop();
          }
          if (!match.command) clearInputState(cm);
          return match.command;
        }

        function handleKeyNonInsertMode() {
          if (handleMacroRecording() || handleEsc()) { return true; }

          vim.inputState.keyBuffer.push(key);
          var keys = vim.inputState.keyBuffer.join("");
          if (/^[1-9]\d*$/.test(keys)) { return true; }

          var keysMatcher = /^(\d*)(.*)$/.exec(keys);
          if (!keysMatcher) { clearInputState(cm); return false; }
          var context = vim.visualMode ? 'visual' :
                                         'normal';
          var mainKey = keysMatcher[2] || keysMatcher[1];
          if (vim.inputState.operatorShortcut && vim.inputState.operatorShortcut.slice(-1) == mainKey) {
            // multikey operators act linewise by repeating only the last character
            mainKey = vim.inputState.operatorShortcut;
          }
          var match = commandDispatcher.matchCommand(mainKey, defaultKeymap, vim.inputState, context);
          if (match.type == 'none') { clearInputState(cm); return false; }
          else if (match.type == 'partial') {
            if (match.expectLiteralNext) vim.expectLiteralNext = true;
            return true;
          }
          else if (match.type == 'clear') { clearInputState(cm); return true; }
          vim.expectLiteralNext = false;

          vim.inputState.keyBuffer.length = 0;
          keysMatcher = /^(\d*)(.*)$/.exec(keys);
          if (keysMatcher[1] && keysMatcher[1] != '0') {
            vim.inputState.pushRepeatDigit(keysMatcher[1]);
          }
          return match.command;
        }

        var command;
        if (vim.insertMode) { command = handleKeyInsertMode(); }
        else { command = handleKeyNonInsertMode(); }
        if (command === false) {
          return !vim.insertMode && key.length === 1 ? function() { return true; } : undefined;
        } else if (command === true) {
          // TODO: Look into using CodeMirror's multi-key handling.
          // Return no-op since we are caching the key. Counts as handled, but
          // don't want act on it just yet.
          return function() { return true; };
        } else {
          return function() {
            if ((command.operator || command.isEdit) && cm.getOption('readOnly'))
              return; // ace_patch
            return cm.operation(function() {
              cm.curOp.isVimOp = true;
              try {
                if (command.type == 'keyToKey') {
                  doKeyToKey(cm, command.toKeys, command);
                } else {
                  commandDispatcher.processCommand(cm, vim, command);
                }
              } catch (e) {
                // clear VIM state in case it's in a bad state.
                cm.state.vim = undefined;
                maybeInitVimState(cm);
                if (!vimApi.suppressErrorLogging) {
                  console['log'](e);
                }
                throw e;
              }
              return true;
            });
          };
        }
      },
      handleEx: function(cm, input) {
        exCommandDispatcher.processCommand(cm, input);
      },

      defineMotion: defineMotion,
      defineAction: defineAction,
      defineOperator: defineOperator,
      mapCommand: mapCommand,
      _mapCommand: _mapCommand,

      defineRegister: defineRegister,

      exitVisualMode: exitVisualMode,
      exitInsertMode: exitInsertMode
    };

    var keyToKeyStack = [];
    var noremap = false;
    var virtualPrompt;
    function sendKeyToPrompt(key) {
      if (key[0] == "<") {
        var lowerKey = key.toLowerCase().slice(1, -1);
        var parts = lowerKey.split('-');
        lowerKey = parts.pop() || '';
        if (lowerKey == 'lt') key = '<';
        else if (lowerKey == 'space') key = ' ';
        else if (lowerKey == 'cr') key = '\n';
        else if (vimToCmKeyMap[lowerKey]) {
          var value = virtualPrompt.value;
          var event =  {
            key: vimToCmKeyMap[lowerKey],
            target: {
              value: value,
              selectionEnd: value.length,
              selectionStart: value.length
            }
          }
          if (virtualPrompt.onKeyDown) {
            virtualPrompt.onKeyDown(event, virtualPrompt.value, close);
          }
          if (virtualPrompt && virtualPrompt.onKeyUp) {
            virtualPrompt.onKeyUp(event, virtualPrompt.value, close);
          }
          return;
        }
      }
      if (key == '\n') {
        var prompt = virtualPrompt;
        virtualPrompt = null;
        prompt.onClose && prompt.onClose(prompt.value);
      } else {
        virtualPrompt.value = (virtualPrompt.value || '') + key;
      }

      function close(value) {
        if (typeof value == 'string') { virtualPrompt.value = value; }
        else { virtualPrompt = null; }
      }
    }
    function doKeyToKey(cm, keys, fromKey) {
      var noremapBefore = noremap;
      // prevent infinite recursion.
      if (fromKey) {
        if (keyToKeyStack.indexOf(fromKey) != -1) return;
        keyToKeyStack.push(fromKey);
        noremap = fromKey.noremap != false;
      }

      try {
        var vim = maybeInitVimState(cm);
        var keyRe = /<(?:[CSMA]-)*\w+>|./gi;

        var match;
        // Pull off one command key, which is either a single character
        // or a special sequence wrapped in '<' and '>', e.g. '<Space>'.
        while ((match = keyRe.exec(keys))) {
          var key = match[0];
          var wasInsert = vim.insertMode;
          if (virtualPrompt) {
            sendKeyToPrompt(key);
            continue;
          }

          var result = vimApi.handleKey(cm, key, 'mapping');

          if (!result && wasInsert && vim.insertMode) {
            if (key[0] == "<") {
              var lowerKey = key.toLowerCase().slice(1, -1);
              var parts = lowerKey.split('-');
              lowerKey = parts.pop() || '';
              if (lowerKey == 'lt') key = '<';
              else if (lowerKey == 'space') key = ' ';
              else if (lowerKey == 'cr') key = '\n';
              else if (vimToCmKeyMap.hasOwnProperty(lowerKey)) {
                // todo support codemirror keys in insertmode vimToCmKeyMap
                key = vimToCmKeyMap[lowerKey];
                sendCmKey(cm, key);
                continue;
              } else {
                key = key[0];
                keyRe.lastIndex = match.index + 1;
              }
            }
            cm.replaceSelection(key);
          }
        }
      } finally {
        keyToKeyStack.pop();
        noremap = keyToKeyStack.length ? noremapBefore : false;
        if (!keyToKeyStack.length && virtualPrompt) {
          var promptOptions = virtualPrompt;
          virtualPrompt = null;
          showPrompt(cm, promptOptions);
        }
      }
    }

    var specialKey = {
      Return: 'CR', Backspace: 'BS', 'Delete': 'Del', Escape: 'Esc', Insert: 'Ins',
      ArrowLeft: 'Left', ArrowRight: 'Right', ArrowUp: 'Up', ArrowDown: 'Down',
      Enter: 'CR', ' ': 'Space'
    };
    var ignoredKeys = { Shift: 1, Alt: 1, Command: 1, Control: 1,
      CapsLock: 1, AltGraph: 1, Dead: 1, Unidentified: 1 };

    var vimToCmKeyMap = {};
    'Left|Right|Up|Down|End|Home'.split('|').concat(Object.keys(specialKey)).forEach(function(x) {
      vimToCmKeyMap[(specialKey[x] || '').toLowerCase()]
         = vimToCmKeyMap[x.toLowerCase()] = x;
    });

    function vimKeyFromEvent(e, vim) {
      var key = e.key;
      if (ignoredKeys[key]) return;
      if (key.length > 1 && key[0] == "n") {
        key = key.replace("Numpad", "");
      }
      key = specialKey[key] || key;

      var name = '';
      if (e.ctrlKey) { name += 'C-'; }
      if (e.altKey) { name += 'A-'; }
      if (e.metaKey) { name += 'M-'; }
      // on mac many characters are entered as option- combos
      // (e.g. on swiss keyboard { is option-8)
      // so we ignore lonely A- modifier for keypress event on mac
      if (CodeMirror.isMac && e.altKey && !e.metaKey && !e.ctrlKey) {
        name = name.slice(2);
      }
      if ((name || key.length > 1) && e.shiftKey) { name += 'S-'; }
  
      if (vim && !vim.expectLiteralNext && key.length == 1) {
        if (langmap.keymap && key in langmap.keymap) {
          if (langmap.remapCtrl != false || !name)
            key = langmap.keymap[key];
        } else if (key.charCodeAt(0) > 255) {
          var code = e.code && e.code.slice(-1) || "";
          if (!e.shiftKey) code = code.toLowerCase();
          if (code) key = code;
        }
      }

      name += key;
      if (name.length > 1) { name = '<' + name + '>'; }
      return name;
    };

    // langmap support
    function updateLangmap(langmapString, remapCtrl) {
      if (langmap.string !== langmapString) {
        langmap = parseLangmap(langmapString);
      }
      langmap.remapCtrl = remapCtrl;
    }
    function parseLangmap(langmapString) {
      // From :help langmap
      /*
        The 'langmap' option is a list of parts, separated with commas.  Each
            part can be in one of two forms:
            1.  A list of pairs.  Each pair is a "from" character immediately
                followed by the "to" character.  Examples: "aA", "aAbBcC".
            2.  A list of "from" characters, a semi-colon and a list of "to"
                characters.  Example: "abc;ABC"
      */

      let keymap = {};
      if (!langmapString) return { keymap: keymap, string: '' };

      function getEscaped(list) {
        return list.split(/\\?(.)/).filter(Boolean);
      }
      langmapString.split(/((?:[^\\,]|\\.)+),/).map(part => {
        if (!part) return;
        const semicolon = part.split(/((?:[^\\;]|\\.)+);/);
        if (semicolon.length == 3) {
          const from = getEscaped(semicolon[1]);
          const to = getEscaped(semicolon[2]);
          if (from.length !== to.length) return; // skip over malformed part
          for (let i = 0; i < from.length; ++i) keymap[from[i]] = to[i];
        } else if (semicolon.length == 1) {
          const pairs = getEscaped(part);
          if (pairs.length % 2 !== 0) return; // skip over malformed part
          for (let i = 0; i < pairs.length; i += 2) keymap[pairs[i]] = pairs[i + 1];
        }
      });

      return { keymap: keymap, string: langmapString };
    }

    defineOption('langmap', undefined, 'string', ['lmap'], function(name, cm) {
      // The 'filetype' option proxies to the CodeMirror 'mode' option.
      if (name === undefined) {
        return langmap.string;
      } else {
        updateLangmap(name);
      }
    });

    // Represents the current input state.
    function InputState() {
      this.prefixRepeat = [];
      this.motionRepeat = [];

      this.operator = null;
      this.operatorArgs = null;
      this.motion = null;
      this.motionArgs = null;
      this.keyBuffer = []; // For matching multi-key commands.
      this.registerName = null; // Defaults to the unnamed register.
      this.changeQueue = null; // For restoring text used by insert mode keybindings
    }
    InputState.prototype.pushRepeatDigit = function(n) {
      if (!this.operator) {
        this.prefixRepeat = this.prefixRepeat.concat(n);
      } else {
        this.motionRepeat = this.motionRepeat.concat(n);
      }
    };
    InputState.prototype.getRepeat = function() {
      var repeat = 0;
      if (this.prefixRepeat.length > 0 || this.motionRepeat.length > 0) {
        repeat = 1;
        if (this.prefixRepeat.length > 0) {
          repeat *= parseInt(this.prefixRepeat.join(''), 10);
        }
        if (this.motionRepeat.length > 0) {
          repeat *= parseInt(this.motionRepeat.join(''), 10);
        }
      }
      return repeat;
    };

    function clearInputState(cm, reason) {
      cm.state.vim.inputState = new InputState();
      cm.state.vim.expectLiteralNext = false;
      CodeMirror.signal(cm, 'vim-command-done', reason);
    }

    function ChangeQueue() {
      this.removed = [];
      this.inserted = "";
    }

    /*
     * Register stores information about copy and paste registers.  Besides
     * text, a register must store whether it is linewise (i.e., when it is
     * pasted, should it insert itself into a new line, or should the text be
     * inserted at the cursor position.)
     */
    function Register(text, linewise, blockwise) {
      this.clear();
      this.keyBuffer = [text || ''];
      this.insertModeChanges = [];
      this.searchQueries = [];
      this.linewise = !!linewise;
      this.blockwise = !!blockwise;
    }
    Register.prototype = {
      setText: function(text, linewise, blockwise) {
        this.keyBuffer = [text || ''];
        this.linewise = !!linewise;
        this.blockwise = !!blockwise;
      },
      pushText: function(text, linewise) {
        // if this register has ever been set to linewise, use linewise.
        if (linewise) {
          if (!this.linewise) {
            this.keyBuffer.push('\n');
          }
          this.linewise = true;
        }
        this.keyBuffer.push(text);
      },
      pushInsertModeChanges: function(changes) {
        this.insertModeChanges.push(createInsertModeChanges(changes));
      },
      pushSearchQuery: function(query) {
        this.searchQueries.push(query);
      },
      clear: function() {
        this.keyBuffer = [];
        this.insertModeChanges = [];
        this.searchQueries = [];
        this.linewise = false;
      },
      toString: function() {
        return this.keyBuffer.join('');
      }
    };

    /**
     * Defines an external register.
     *
     * The name should be a single character that will be used to reference the register.
     * The register should support setText, pushText, clear, and toString(). See Register
     * for a reference implementation.
     */
    function defineRegister(name, register) {
      var registers = vimGlobalState.registerController.registers;
      if (!name || name.length != 1) {
        throw Error('Register name must be 1 character');
      }
      // ace_patch
      registers[name] = register;
      validRegisters.push(name);
    }

    /*
     * vim registers allow you to keep many independent copy and paste buffers.
     * See http://usevim.com/2012/04/13/registers/ for an introduction.
     *
     * RegisterController keeps the state of all the registers.  An initial
     * state may be passed in.  The unnamed register '"' will always be
     * overridden.
     */
    function RegisterController(registers) {
      this.registers = registers;
      this.unnamedRegister = registers['"'] = new Register();
      registers['.'] = new Register();
      registers[':'] = new Register();
      registers['/'] = new Register();
      registers['+'] = new Register();
    }
    RegisterController.prototype = {
      pushText: function(registerName, operator, text, linewise, blockwise) {
        // The black hole register, "_, means delete/yank to nowhere.
        if (registerName === '_') return;
        if (linewise && text.charAt(text.length - 1) !== '\n'){
          text += '\n';
        }
        // Lowercase and uppercase registers refer to the same register.
        // Uppercase just means append.
        var register = this.isValidRegister(registerName) ?
            this.getRegister(registerName) : null;
        // if no register/an invalid register was specified, things go to the
        // default registers
        if (!register) {
          switch (operator) {
            case 'yank':
              // The 0 register contains the text from the most recent yank.
              this.registers['0'] = new Register(text, linewise, blockwise);
              break;
            case 'delete':
            case 'change':
              if (text.indexOf('\n') == -1) {
                // Delete less than 1 line. Update the small delete register.
                this.registers['-'] = new Register(text, linewise);
              } else {
                // Shift down the contents of the numbered registers and put the
                // deleted text into register 1.
                this.shiftNumericRegisters_();
                this.registers['1'] = new Register(text, linewise);
              }
              break;
          }
          // Make sure the unnamed register is set to what just happened
          this.unnamedRegister.setText(text, linewise, blockwise);
          return;
        }

        // If we've gotten to this point, we've actually specified a register
        var append = isUpperCase(registerName);
        if (append) {
          register.pushText(text, linewise);
        } else {
          register.setText(text, linewise, blockwise);
        }
        if (registerName === '+' && typeof navigator !== 'undefined' &&
          typeof navigator.clipboard !== 'undefined' &&
          typeof navigator.clipboard.readText === 'function') {
          navigator.clipboard.writeText(text);
        }
        // The unnamed register always has the same value as the last used
        // register.
        this.unnamedRegister.setText(register.toString(), linewise);
      },
      // Gets the register named @name.  If one of @name doesn't already exist,
      // create it.  If @name is invalid, return the unnamedRegister.
      getRegister: function(name) {
        if (!this.isValidRegister(name)) {
          return this.unnamedRegister;
        }
        name = name.toLowerCase();
        if (!this.registers[name]) {
          this.registers[name] = new Register();
        }
        return this.registers[name];
      },
      isValidRegister: function(name) {
        return name && (inArray(name, validRegisters) || latinCharRegex.test(name));
      },
      shiftNumericRegisters_: function() {
        for (var i = 9; i >= 2; i--) {
          this.registers[i] = this.getRegister('' + (i - 1));
        }
      }
    };
    function HistoryController() {
        this.historyBuffer = [];
        this.iterator = 0;
        this.initialPrefix = null;
    }
    HistoryController.prototype = {
      // the input argument here acts a user entered prefix for a small time
      // until we start autocompletion in which case it is the autocompleted.
      nextMatch: function (input, up) {
        var historyBuffer = this.historyBuffer;
        var dir = up ? -1 : 1;
        if (this.initialPrefix === null) this.initialPrefix = input;
        for (var i = this.iterator + dir; up ? i >= 0 : i < historyBuffer.length; i+= dir) {
          var element = historyBuffer[i];
          for (var j = 0; j <= element.length; j++) {
            if (this.initialPrefix == element.substring(0, j)) {
              this.iterator = i;
              return element;
            }
          }
        }
        // should return the user input in case we reach the end of buffer.
        if (i >= historyBuffer.length) {
          this.iterator = historyBuffer.length;
          return this.initialPrefix;
        }
        // return the last autocompleted query or exCommand as it is.
        if (i < 0 ) return input;
      },
      pushInput: function(input) {
        var index = this.historyBuffer.indexOf(input);
        if (index > -1) this.historyBuffer.splice(index, 1);
        if (input.length) this.historyBuffer.push(input);
      },
      reset: function() {
        this.initialPrefix = null;
        this.iterator = this.historyBuffer.length;
      }
    };
    var commandDispatcher = {
      matchCommand: function(keys, keyMap, inputState, context) {
        var matches = commandMatches(keys, keyMap, context, inputState);
        if (!matches.full && !matches.partial) {
          return {type: 'none'};
        } else if (!matches.full && matches.partial) {
          return {
            type: 'partial',
            expectLiteralNext: matches.partial.length == 1 && matches.partial[0].keys.slice(-11) == '<character>' // langmap literal logic
          };
        }

        var bestMatch;
        for (var i = 0; i < matches.full.length; i++) {
          var match = matches.full[i];
          if (!bestMatch) {
            bestMatch = match;
          }
        }
        if (bestMatch.keys.slice(-11) == '<character>' || bestMatch.keys.slice(-10) == '<register>') {
          var character = lastChar(keys);
          if (!character || character.length > 1) return {type: 'clear'};
          inputState.selectedCharacter = character;
        }
        return {type: 'full', command: bestMatch};
      },
      processCommand: function(cm, vim, command) {
        vim.inputState.repeatOverride = command.repeatOverride;
        switch (command.type) {
          case 'motion':
            this.processMotion(cm, vim, command);
            break;
          case 'operator':
            this.processOperator(cm, vim, command);
            break;
          case 'operatorMotion':
            this.processOperatorMotion(cm, vim, command);
            break;
          case 'action':
            this.processAction(cm, vim, command);
            break;
          case 'search':
            this.processSearch(cm, vim, command);
            break;
          case 'ex':
          case 'keyToEx':
            this.processEx(cm, vim, command);
            break;
          default:
            break;
        }
      },
      processMotion: function(cm, vim, command) {
        vim.inputState.motion = command.motion;
        vim.inputState.motionArgs = copyArgs(command.motionArgs);
        this.evalInput(cm, vim);
      },
      processOperator: function(cm, vim, command) {
        var inputState = vim.inputState;
        if (inputState.operator) {
          if (inputState.operator == command.operator) {
            // Typing an operator twice like 'dd' makes the operator operate
            // linewise
            inputState.motion = 'expandToLine';
            inputState.motionArgs = { linewise: true };
            this.evalInput(cm, vim);
            return;
          } else {
            // 2 different operators in a row doesn't make sense.
            clearInputState(cm);
          }
        }
        inputState.operator = command.operator;
        inputState.operatorArgs = copyArgs(command.operatorArgs);
        if (command.keys.length > 1) {
          inputState.operatorShortcut = command.keys;
        }
        if (command.exitVisualBlock) {
            vim.visualBlock = false;
            updateCmSelection(cm);
        }
        if (vim.visualMode) {
          // Operating on a selection in visual mode. We don't need a motion.
          this.evalInput(cm, vim);
        }
      },
      processOperatorMotion: function(cm, vim, command) {
        var visualMode = vim.visualMode;
        var operatorMotionArgs = copyArgs(command.operatorMotionArgs);
        if (operatorMotionArgs) {
          // Operator motions may have special behavior in visual mode.
          if (visualMode && operatorMotionArgs.visualLine) {
            vim.visualLine = true;
          }
        }
        this.processOperator(cm, vim, command);
        if (!visualMode) {
          this.processMotion(cm, vim, command);
        }
      },
      processAction: function(cm, vim, command) {
        var inputState = vim.inputState;
        var repeat = inputState.getRepeat();
        var repeatIsExplicit = !!repeat;
        var actionArgs = copyArgs(command.actionArgs) || {};
        if (inputState.selectedCharacter) {
          actionArgs.selectedCharacter = inputState.selectedCharacter;
        }
        // Actions may or may not have motions and operators. Do these first.
        if (command.operator) {
          this.processOperator(cm, vim, command);
        }
        if (command.motion) {
          this.processMotion(cm, vim, command);
        }
        if (command.motion || command.operator) {
          this.evalInput(cm, vim);
        }
        actionArgs.repeat = repeat || 1;
        actionArgs.repeatIsExplicit = repeatIsExplicit;
        actionArgs.registerName = inputState.registerName;
        clearInputState(cm);
        vim.lastMotion = null;
        if (command.isEdit) {
          this.recordLastEdit(vim, inputState, command);
        }
        actions[command.action](cm, actionArgs, vim);
      },
      processSearch: function(cm, vim, command) {
        if (!cm.getSearchCursor) {
          // Search depends on SearchCursor.
          return;
        }
        var forward = command.searchArgs.forward;
        var wholeWordOnly = command.searchArgs.wholeWordOnly;
        getSearchState(cm).setReversed(!forward);
        var promptPrefix = (forward) ? '/' : '?';
        var originalQuery = getSearchState(cm).getQuery();
        var originalScrollPos = cm.getScrollInfo();
        function handleQuery(query, ignoreCase, smartCase) {
          vimGlobalState.searchHistoryController.pushInput(query);
          vimGlobalState.searchHistoryController.reset();
          try {
            updateSearchQuery(cm, query, ignoreCase, smartCase);
          } catch (e) {
            showConfirm(cm, 'Invalid regex: ' + query);
            clearInputState(cm);
            return;
          }
          commandDispatcher.processMotion(cm, vim, {
            type: 'motion',
            motion: 'findNext',
            motionArgs: { forward: true, toJumplist: command.searchArgs.toJumplist }
          });
        }
        function onPromptClose(query) {
          //ace_patch cm.scrollTo(originalScrollPos.left, originalScrollPos.top);
          handleQuery(query, true /** ignoreCase */, true /** smartCase */);
          var macroModeState = vimGlobalState.macroModeState;
          if (macroModeState.isRecording) {
            logSearchQuery(macroModeState, query);
          }
        }
        function onPromptKeyUp(e, query, close) {
          var keyName = vimKeyFromEvent(e), up, offset;
          if (keyName == '<Up>' || keyName == '<Down>') {
            up = keyName == '<Up>' ? true : false;
            offset = e.target ? e.target.selectionEnd : 0;
            query = vimGlobalState.searchHistoryController.nextMatch(query, up) || '';
            close(query);
            if (offset && e.target) e.target.selectionEnd = e.target.selectionStart = Math.min(offset, e.target.value.length);
          } else if (keyName && keyName != '<Left>' && keyName != '<Right>') {
            vimGlobalState.searchHistoryController.reset();
          }
          var parsedQuery;
          try {
            parsedQuery = updateSearchQuery(cm, query,
                true /** ignoreCase */, true /** smartCase */);
          } catch (e) {
            // Swallow bad regexes for incremental search.
          }
          if (parsedQuery) {
            cm.scrollIntoView(findNext(cm, !forward, parsedQuery), 30);
          } else {
            clearSearchHighlight(cm);
            cm.scrollTo(originalScrollPos.left, originalScrollPos.top);
          }
        }
        function onPromptKeyDown(e, query, close) {
          var keyName = vimKeyFromEvent(e);
          if (keyName == '<Esc>' || keyName == '<C-c>' || keyName == '<C-[>' ||
              (keyName == '<BS>' && query == '')) {
            vimGlobalState.searchHistoryController.pushInput(query);
            vimGlobalState.searchHistoryController.reset();
            updateSearchQuery(cm, originalQuery);
            clearSearchHighlight(cm);
            cm.scrollTo(originalScrollPos.left, originalScrollPos.top);
            CodeMirror.e_stop(e);
            clearInputState(cm);
            close();
            cm.focus();
          } else if (keyName == '<Up>' || keyName == '<Down>') {
            CodeMirror.e_stop(e);
          } else if (keyName == '<C-u>') {
            // Ctrl-U clears input.
            CodeMirror.e_stop(e);
            close('');
          }
        }
        switch (command.searchArgs.querySrc) {
          case 'prompt':
            var macroModeState = vimGlobalState.macroModeState;
            if (macroModeState.isPlaying) {
              var query = macroModeState.replaySearchQueries.shift();
              handleQuery(query, true /** ignoreCase */, false /** smartCase */);
            } else {
              showPrompt(cm, {
                  onClose: onPromptClose,
                  prefix: promptPrefix,
                  desc: '(JavaScript regexp)',
                  onKeyUp: onPromptKeyUp,
                  onKeyDown: onPromptKeyDown
              });
            }
            break;
          case 'wordUnderCursor':
            var word = expandWordUnderCursor(cm, {noSymbol: true});
            var isKeyword = true;
            if (!word) {
              word = expandWordUnderCursor(cm, {noSymbol: false});
              isKeyword = false;
            }
            if (!word) {
              showConfirm(cm, 'No word under cursor');
              clearInputState(cm);
              return;
            }
            var query = cm.getLine(word.start.line).substring(word.start.ch,
                word.end.ch);
            if (isKeyword && wholeWordOnly) {
                query = '\\b' + query + '\\b';
            } else {
              query = escapeRegex(query);
            }

            // cachedCursor is used to save the old position of the cursor
            // when * or # causes vim to seek for the nearest word and shift
            // the cursor before entering the motion.
            vimGlobalState.jumpList.cachedCursor = cm.getCursor();
            cm.setCursor(word.start);

            handleQuery(query, true /** ignoreCase */, false /** smartCase */);
            break;
        }
      },
      processEx: function(cm, vim, command) {
        function onPromptClose(input) {
          // Give the prompt some time to close so that if processCommand shows
          // an error, the elements don't overlap.
          vimGlobalState.exCommandHistoryController.pushInput(input);
          vimGlobalState.exCommandHistoryController.reset();
          exCommandDispatcher.processCommand(cm, input);
          if (cm.state.vim) clearInputState(cm);
        }
        function onPromptKeyDown(e, input, close) {
          var keyName = vimKeyFromEvent(e), up, offset;
          if (keyName == '<Esc>' || keyName == '<C-c>' || keyName == '<C-[>' ||
              (keyName == '<BS>' && input == '')) {
            vimGlobalState.exCommandHistoryController.pushInput(input);
            vimGlobalState.exCommandHistoryController.reset();
            CodeMirror.e_stop(e);
            clearInputState(cm);
            close();
            cm.focus();
          }
          if (keyName == '<Up>' || keyName == '<Down>') {
            CodeMirror.e_stop(e);
            up = keyName == '<Up>' ? true : false;
            offset = e.target ? e.target.selectionEnd : 0;
            input = vimGlobalState.exCommandHistoryController.nextMatch(input, up) || '';
            close(input);
            if (offset && e.target) e.target.selectionEnd = e.target.selectionStart = Math.min(offset, e.target.value.length);
          } else if (keyName == '<C-u>') {
            // Ctrl-U clears input.
            CodeMirror.e_stop(e);
            close('');
          } else if (keyName && keyName != '<Left>' && keyName != '<Right>') {
              vimGlobalState.exCommandHistoryController.reset();
          }
        }
        if (command.type == 'keyToEx') {
          // Handle user defined Ex to Ex mappings
          exCommandDispatcher.processCommand(cm, command.exArgs.input);
        } else {
          if (vim.visualMode) {
            showPrompt(cm, { onClose: onPromptClose, prefix: ':', value: '\'<,\'>',
                onKeyDown: onPromptKeyDown, selectValueOnOpen: false});
          } else {
            showPrompt(cm, { onClose: onPromptClose, prefix: ':',
                onKeyDown: onPromptKeyDown});
          }
        }
      },
      evalInput: function(cm, vim) {
        // If the motion command is set, execute both the operator and motion.
        // Otherwise return.
        var inputState = vim.inputState;
        var motion = inputState.motion;
        var motionArgs = inputState.motionArgs || {};
        var operator = inputState.operator;
        var operatorArgs = inputState.operatorArgs || {};
        var registerName = inputState.registerName;
        var sel = vim.sel;
        // TODO: Make sure cm and vim selections are identical outside visual mode.
        var origHead = copyCursor(vim.visualMode ? clipCursorToContent(cm, sel.head): cm.getCursor('head'));
        var origAnchor = copyCursor(vim.visualMode ? clipCursorToContent(cm, sel.anchor) : cm.getCursor('anchor'));
        var oldHead = copyCursor(origHead);
        var oldAnchor = copyCursor(origAnchor);
        var newHead, newAnchor;
        var repeat;
        if (operator) {
          this.recordLastEdit(vim, inputState);
        }
        if (inputState.repeatOverride !== undefined) {
          // If repeatOverride is specified, that takes precedence over the
          // input state's repeat. Used by Ex mode and can be user defined.
          repeat = inputState.repeatOverride;
        } else {
          repeat = inputState.getRepeat();
        }
        if (repeat > 0 && motionArgs.explicitRepeat) {
          motionArgs.repeatIsExplicit = true;
        } else if (motionArgs.noRepeat ||
            (!motionArgs.explicitRepeat && repeat === 0)) {
          repeat = 1;
          motionArgs.repeatIsExplicit = false;
        }
        if (inputState.selectedCharacter) {
          // If there is a character input, stick it in all of the arg arrays.
          motionArgs.selectedCharacter = operatorArgs.selectedCharacter =
              inputState.selectedCharacter;
        }
        motionArgs.repeat = repeat;
        clearInputState(cm);
        if (motion) {
          var motionResult = motions[motion](cm, origHead, motionArgs, vim, inputState);
          vim.lastMotion = motions[motion];
          if (!motionResult) {
            return;
          }
          if (motionArgs.toJumplist) {
            if (!operator && cm.ace.curOp != null)
              cm.ace.curOp.command.scrollIntoView = "center-animate"; // ace_patch
            var jumpList = vimGlobalState.jumpList;
            // if the current motion is # or *, use cachedCursor
            var cachedCursor = jumpList.cachedCursor;
            if (cachedCursor) {
              recordJumpPosition(cm, cachedCursor, motionResult);
              delete jumpList.cachedCursor;
            } else {
              recordJumpPosition(cm, origHead, motionResult);
            }
          }
          if (motionResult instanceof Array) {
            newAnchor = motionResult[0];
            newHead = motionResult[1];
          } else {
            newHead = motionResult;
          }
          // TODO: Handle null returns from motion commands better.
          if (!newHead) {
            newHead = copyCursor(origHead);
          }
          if (vim.visualMode) {
            if (!(vim.visualBlock && newHead.ch === Infinity)) {
              newHead = clipCursorToContent(cm, newHead, oldHead);
            }
            if (newAnchor) {
              newAnchor = clipCursorToContent(cm, newAnchor);
            }
            newAnchor = newAnchor || oldAnchor;
            sel.anchor = newAnchor;
            sel.head = newHead;
            updateCmSelection(cm);
            updateMark(cm, vim, '<',
                cursorIsBefore(newAnchor, newHead) ? newAnchor
                    : newHead);
            updateMark(cm, vim, '>',
                cursorIsBefore(newAnchor, newHead) ? newHead
                    : newAnchor);
          } else if (!operator) {
            if (cm.ace.curOp)
              cm.ace.curOp.vimDialogScroll = "center-animate"; // ace_patch
            newHead = clipCursorToContent(cm, newHead, oldHead);
            cm.setCursor(newHead.line, newHead.ch);
          }
        }
        if (operator) {
          if (operatorArgs.lastSel) {
            // Replaying a visual mode operation
            newAnchor = oldAnchor;
            var lastSel = operatorArgs.lastSel;
            var lineOffset = Math.abs(lastSel.head.line - lastSel.anchor.line);
            var chOffset = Math.abs(lastSel.head.ch - lastSel.anchor.ch);
            if (lastSel.visualLine) {
              // Linewise Visual mode: The same number of lines.
              newHead = new Pos(oldAnchor.line + lineOffset, oldAnchor.ch);
            } else if (lastSel.visualBlock) {
              // Blockwise Visual mode: The same number of lines and columns.
              newHead = new Pos(oldAnchor.line + lineOffset, oldAnchor.ch + chOffset);
            } else if (lastSel.head.line == lastSel.anchor.line) {
              // Normal Visual mode within one line: The same number of characters.
              newHead = new Pos(oldAnchor.line, oldAnchor.ch + chOffset);
            } else {
              // Normal Visual mode with several lines: The same number of lines, in the
              // last line the same number of characters as in the last line the last time.
              newHead = new Pos(oldAnchor.line + lineOffset, oldAnchor.ch);
            }
            vim.visualMode = true;
            vim.visualLine = lastSel.visualLine;
            vim.visualBlock = lastSel.visualBlock;
            sel = vim.sel = {
              anchor: newAnchor,
              head: newHead
            };
            updateCmSelection(cm);
          } else if (vim.visualMode) {
            operatorArgs.lastSel = {
              anchor: copyCursor(sel.anchor),
              head: copyCursor(sel.head),
              visualBlock: vim.visualBlock,
              visualLine: vim.visualLine
            };
          }
          var curStart, curEnd, linewise, mode;
          var cmSel;
          if (vim.visualMode) {
            // Init visual op
            curStart = cursorMin(sel.head, sel.anchor);
            curEnd = cursorMax(sel.head, sel.anchor);
            linewise = vim.visualLine || operatorArgs.linewise;
            mode = vim.visualBlock ? 'block' :
                   linewise ? 'line' :
                   'char';
            var newPositions = updateSelectionForSurrogateCharacters(cm, curStart, curEnd);
            cmSel = makeCmSelection(cm, {
              anchor: newPositions.start,
              head: newPositions.end
            }, mode);
            if (linewise) {
              var ranges = cmSel.ranges;
              if (mode == 'block') {
                // Linewise operators in visual block mode extend to end of line
                for (var i = 0; i < ranges.length; i++) {
                  ranges[i].head.ch = lineLength(cm, ranges[i].head.line);
                }
              } else if (mode == 'line') {
                ranges[0].head = new Pos(ranges[0].head.line + 1, 0);
              }
            }
          } else {
            // Init motion op
            curStart = copyCursor(newAnchor || oldAnchor);
            curEnd = copyCursor(newHead || oldHead);
            if (cursorIsBefore(curEnd, curStart)) {
              var tmp = curStart;
              curStart = curEnd;
              curEnd = tmp;
            }
            linewise = motionArgs.linewise || operatorArgs.linewise;
            if (linewise) {
              // Expand selection to entire line.
              expandSelectionToLine(cm, curStart, curEnd);
            } else if (motionArgs.forward) {
              // Clip to trailing newlines only if the motion goes forward.
              clipToLine(cm, curStart, curEnd);
            }
            mode = 'char';
            var exclusive = !motionArgs.inclusive || linewise;
            var newPositions = updateSelectionForSurrogateCharacters(cm, curStart, curEnd);
            cmSel = makeCmSelection(cm, {
              anchor: newPositions.start,
              head: newPositions.end
            }, mode, exclusive);
          }
          cm.setSelections(cmSel.ranges, cmSel.primary);
          vim.lastMotion = null;
          operatorArgs.repeat = repeat; // For indent in visual mode.
          operatorArgs.registerName = registerName;
          // Keep track of linewise as it affects how paste and change behave.
          operatorArgs.linewise = linewise;
          var operatorMoveTo = operators[operator](
            cm, operatorArgs, cmSel.ranges, oldAnchor, newHead);
          if (vim.visualMode) {
            exitVisualMode(cm, operatorMoveTo != null);
          }
          if (operatorMoveTo) {
            cm.setCursor(operatorMoveTo);
          }
        }
      },
      recordLastEdit: function(vim, inputState, actionCommand) {
        var macroModeState = vimGlobalState.macroModeState;
        if (macroModeState.isPlaying) { return; }
        vim.lastEditInputState = inputState;
        vim.lastEditActionCommand = actionCommand;
        macroModeState.lastInsertModeChanges.changes = [];
        macroModeState.lastInsertModeChanges.expectCursorActivityForChange = false;
        macroModeState.lastInsertModeChanges.visualBlock = vim.visualBlock ? vim.sel.head.line - vim.sel.anchor.line : 0;
      }
    };

    /**
     * typedef {Object{line:number,ch:number}} Cursor An object containing the
     *     position of the cursor.
     */
    // All of the functions below return Cursor objects.
    var motions = {
      moveToTopLine: function(cm, _head, motionArgs) {
        var line = getUserVisibleLines(cm).top + motionArgs.repeat -1;
        return new Pos(line, findFirstNonWhiteSpaceCharacter(cm.getLine(line)));
      },
      moveToMiddleLine: function(cm) {
        var range = getUserVisibleLines(cm);
        var line = Math.floor((range.top + range.bottom) * 0.5);
        return new Pos(line, findFirstNonWhiteSpaceCharacter(cm.getLine(line)));
      },
      moveToBottomLine: function(cm, _head, motionArgs) {
        var line = getUserVisibleLines(cm).bottom - motionArgs.repeat +1;
        return new Pos(line, findFirstNonWhiteSpaceCharacter(cm.getLine(line)));
      },
      expandToLine: function(_cm, head, motionArgs) {
        // Expands forward to end of line, and then to next line if repeat is
        // >1. Does not handle backward motion!
        var cur = head;
        return new Pos(cur.line + motionArgs.repeat - 1, Infinity);
      },
      findNext: function(cm, _head, motionArgs) {
        var state = getSearchState(cm);
        var query = state.getQuery();
        if (!query) {
          return;
        }
        var prev = !motionArgs.forward;
        // If search is initiated with ? instead of /, negate direction.
        prev = (state.isReversed()) ? !prev : prev;
        highlightSearchMatches(cm, query);
        return findNext(cm, prev/** prev */, query, motionArgs.repeat);
      },
      /**
       * Find and select the next occurrence of the search query. If the cursor is currently
       * within a match, then find and select the current match. Otherwise, find the next occurrence in the
       * appropriate direction.
       *
       * This differs from `findNext` in the following ways:
       *
       * 1. Instead of only returning the "from", this returns a "from", "to" range.
       * 2. If the cursor is currently inside a search match, this selects the current match
       *    instead of the next match.
       * 3. If there is no associated operator, this will turn on visual mode.
       */
      findAndSelectNextInclusive: function(cm, _head, motionArgs, vim, prevInputState) {
        var state = getSearchState(cm);
        var query = state.getQuery();

        if (!query) {
          return;
        }

        var prev = !motionArgs.forward;
        prev = (state.isReversed()) ? !prev : prev;

        // next: [from, to] | null
        var next = findNextFromAndToInclusive(cm, prev, query, motionArgs.repeat, vim);

        // No matches.
        if (!next) {
          return;
        }

        // If there's an operator that will be executed, return the selection.
        if (prevInputState.operator) {
          return next;
        }

        // At this point, we know that there is no accompanying operator -- let's
        // deal with visual mode in order to select an appropriate match.

        var from = next[0];
        // For whatever reason, when we use the "to" as returned by searchcursor.js directly,
        // the resulting selection is extended by 1 char. Let's shrink it so that only the
        // match is selected.
        var to = new Pos(next[1].line, next[1].ch - 1);

        if (vim.visualMode) {
          // If we were in visualLine or visualBlock mode, get out of it.
          if (vim.visualLine || vim.visualBlock) {
            vim.visualLine = false;
            vim.visualBlock = false;
            CodeMirror.signal(cm, "vim-mode-change", {mode: "visual", subMode: ""});
          }

          // If we're currently in visual mode, we should extend the selection to include
          // the search result.
          var anchor = vim.sel.anchor;
          if (anchor) {
            if (state.isReversed()) {
              if (motionArgs.forward) {
                return [anchor, from];
              }

              return [anchor, to];
            } else {
              if (motionArgs.forward) {
                return [anchor, to];
              }

              return [anchor, from];
            }
          }
        } else {
          // Let's turn visual mode on.
          vim.visualMode = true;
          vim.visualLine = false;
          vim.visualBlock = false;
          CodeMirror.signal(cm, "vim-mode-change", {mode: "visual", subMode: ""});
        }

        return prev ? [to, from] : [from, to];
      },
      goToMark: function(cm, _head, motionArgs, vim) {
        var pos = getMarkPos(cm, vim, motionArgs.selectedCharacter);
        if (pos) {
          return motionArgs.linewise ? { line: pos.line, ch: findFirstNonWhiteSpaceCharacter(cm.getLine(pos.line)) } : pos;
        }
        return null;
      },
      moveToOtherHighlightedEnd: function(cm, _head, motionArgs, vim) {
        if (vim.visualBlock && motionArgs.sameLine) {
          var sel = vim.sel;
          return [
            clipCursorToContent(cm, new Pos(sel.anchor.line, sel.head.ch)),
            clipCursorToContent(cm, new Pos(sel.head.line, sel.anchor.ch))
          ];
        } else {
          return ([vim.sel.head, vim.sel.anchor]);
        }
      },
      jumpToMark: function(cm, head, motionArgs, vim) {
        var best = head;
        for (var i = 0; i < motionArgs.repeat; i++) {
          var cursor = best;
          for (var key in vim.marks) {
            if (!isLowerCase(key)) {
              continue;
            }
            var mark = vim.marks[key].find();
            var isWrongDirection = (motionArgs.forward) ?
              cursorIsBefore(mark, cursor) : cursorIsBefore(cursor, mark);

            if (isWrongDirection) {
              continue;
            }
            if (motionArgs.linewise && (mark.line == cursor.line)) {
              continue;
            }

            var equal = cursorEqual(cursor, best);
            var between = (motionArgs.forward) ?
              cursorIsBetween(cursor, mark, best) :
              cursorIsBetween(best, mark, cursor);

            if (equal || between) {
              best = mark;
            }
          }
        }

        if (motionArgs.linewise) {
          // Vim places the cursor on the first non-whitespace character of
          // the line if there is one, else it places the cursor at the end
          // of the line, regardless of whether a mark was found.
          best = new Pos(best.line, findFirstNonWhiteSpaceCharacter(cm.getLine(best.line)));
        }
        return best;
      },
      moveByCharacters: function(_cm, head, motionArgs) {
        var cur = head;
        var repeat = motionArgs.repeat;
        var ch = motionArgs.forward ? cur.ch + repeat : cur.ch - repeat;
        return new Pos(cur.line, ch);
      },
      moveByLines: function(cm, head, motionArgs, vim) {
        var cur = head;
        var endCh = cur.ch;
        // Depending what our last motion was, we may want to do different
        // things. If our last motion was moving vertically, we want to
        // preserve the HPos from our last horizontal move.  If our last motion
        // was going to the end of a line, moving vertically we should go to
        // the end of the line, etc.
        switch (vim.lastMotion) {
          case this.moveByLines:
          case this.moveByDisplayLines:
          case this.moveByScroll:
          case this.moveToColumn:
          case this.moveToEol:
            endCh = vim.lastHPos;
            break;
          default:
            vim.lastHPos = endCh;
        }
        var repeat = motionArgs.repeat+(motionArgs.repeatOffset||0);
        var line = motionArgs.forward ? cur.line + repeat : cur.line - repeat;
        var first = cm.firstLine();
        var last = cm.lastLine();
        // Vim go to line begin or line end when cursor at first/last line and
        // move to previous/next line is triggered.
        if (line < first && cur.line == first){
          return this.moveToStartOfLine(cm, head, motionArgs, vim);
        } else if (line > last && cur.line == last){
            return moveToEol(cm, head, motionArgs, vim, true);
        }
        // ace_patch{
        var fold = cm.ace.session.getFoldLine(line);
        if (fold) {
          if (motionArgs.forward) {
            if (line > fold.start.row)
              line = fold.end.row + 1;
          } else {
            line = fold.start.row;
          }
        }
        // ace_patch}
        if (motionArgs.toFirstChar){
          endCh=findFirstNonWhiteSpaceCharacter(cm.getLine(line));
          vim.lastHPos = endCh;
        }
        vim.lastHSPos = cm.charCoords(new Pos(line, endCh),'div').left;
        return new Pos(line, endCh);
      },
      moveByDisplayLines: function(cm, head, motionArgs, vim) {
        var cur = head;
        switch (vim.lastMotion) {
          case this.moveByDisplayLines:
          case this.moveByScroll:
          case this.moveByLines:
          case this.moveToColumn:
          case this.moveToEol:
            break;
          default:
            vim.lastHSPos = cm.charCoords(cur,'div').left;
        }
        var repeat = motionArgs.repeat;
        var res=cm.findPosV(cur,(motionArgs.forward ? repeat : -repeat),'line',vim.lastHSPos);
        if (res.hitSide) {
          if (motionArgs.forward) {
            var lastCharCoords = cm.charCoords(res, 'div');
            var goalCoords = { top: lastCharCoords.top + 8, left: vim.lastHSPos };
            var res = cm.coordsChar(goalCoords, 'div');
          } else {
            var resCoords = cm.charCoords(new Pos(cm.firstLine(), 0), 'div');
            resCoords.left = vim.lastHSPos;
            res = cm.coordsChar(resCoords, 'div');
          }
        }
        vim.lastHPos = res.ch;
        return res;
      },
      moveByPage: function(cm, head, motionArgs) {
        // CodeMirror only exposes functions that move the cursor page down, so
        // doing this bad hack to move the cursor and move it back. evalInput
        // will move the cursor to where it should be in the end.
        var curStart = head;
        var repeat = motionArgs.repeat;
        return cm.findPosV(curStart, (motionArgs.forward ? repeat : -repeat), 'page');
      },
      moveByParagraph: function(cm, head, motionArgs) {
        var dir = motionArgs.forward ? 1 : -1;
        return findParagraph(cm, head, motionArgs.repeat, dir);
      },
      moveBySentence: function(cm, head, motionArgs) {
        var dir = motionArgs.forward ? 1 : -1;
        return findSentence(cm, head, motionArgs.repeat, dir);
      },
      moveByScroll: function(cm, head, motionArgs, vim) {
        var scrollbox = cm.getScrollInfo();
        var curEnd = null;
        var repeat = motionArgs.repeat;
        if (!repeat) {
          repeat = scrollbox.clientHeight / (2 * cm.defaultTextHeight());
        }
        var orig = cm.charCoords(head, 'local');
        motionArgs.repeat = repeat;
        curEnd = motions.moveByDisplayLines(cm, head, motionArgs, vim);
        if (!curEnd) {
          return null;
        }
        var dest = cm.charCoords(curEnd, 'local');
        cm.scrollTo(null, scrollbox.top + dest.top - orig.top);
        return curEnd;
      },
      moveByWords: function(cm, head, motionArgs) {
        return moveToWord(cm, head, motionArgs.repeat, !!motionArgs.forward,
            !!motionArgs.wordEnd, !!motionArgs.bigWord);
      },
      moveTillCharacter: function(cm, head, motionArgs) {
        var repeat = motionArgs.repeat;
        var curEnd = moveToCharacter(cm, repeat, motionArgs.forward,
            motionArgs.selectedCharacter, head);
        var increment = motionArgs.forward ? -1 : 1;
        recordLastCharacterSearch(increment, motionArgs);
        if (!curEnd) return null;
        curEnd.ch += increment;
        return curEnd;
      },
      moveToCharacter: function(cm, head, motionArgs) {
        var repeat = motionArgs.repeat;
        recordLastCharacterSearch(0, motionArgs);
        return moveToCharacter(cm, repeat, motionArgs.forward,
            motionArgs.selectedCharacter, head) || head;
      },
      moveToSymbol: function(cm, head, motionArgs) {
        var repeat = motionArgs.repeat;
        return findSymbol(cm, repeat, motionArgs.forward,
            motionArgs.selectedCharacter) || head;
      },
      moveToColumn: function(cm, head, motionArgs, vim) {
        var repeat = motionArgs.repeat;
        // repeat is equivalent to which column we want to move to!
        vim.lastHPos = repeat - 1;
        vim.lastHSPos = cm.charCoords(head,'div').left;
        return moveToColumn(cm, repeat);
      },
      moveToEol: function(cm, head, motionArgs, vim) {
        return moveToEol(cm, head, motionArgs, vim, false);
      },
      moveToFirstNonWhiteSpaceCharacter: function(cm, head) {
        // Go to the start of the line where the text begins, or the end for
        // whitespace-only lines
        var cursor = head;
        return new Pos(cursor.line,
                   findFirstNonWhiteSpaceCharacter(cm.getLine(cursor.line)));
      },
      moveToMatchedSymbol: function(cm, head) {
        var cursor = head;
        var line = cursor.line;
        var ch = cursor.ch;
        var lineText = cm.getLine(line);
        var symbol;
        for (; ch < lineText.length; ch++) {
          symbol = lineText.charAt(ch);
          if (symbol && isMatchableSymbol(symbol)) {
            var style = cm.getTokenTypeAt(new Pos(line, ch + 1));
            if (style !== "string" && style !== "comment") {
              break;
            }
          }
        }
        if (ch < lineText.length) {
          // Only include angle brackets in analysis if they are being matched.
          var re = /[<>]/.test(lineText[ch]) ? /[(){}[\]<>]/ : /[(){}[\]]/; //ace_patch?
          var matched = cm.findMatchingBracket(new Pos(line, ch+1), {bracketRegex: re});
          return matched.to;
        } else {
          return cursor;
        }
      },
      moveToStartOfLine: function(_cm, head) {
        return new Pos(head.line, 0);
      },
      moveToLineOrEdgeOfDocument: function(cm, _head, motionArgs) {
        var lineNum = motionArgs.forward ? cm.lastLine() : cm.firstLine();
        if (motionArgs.repeatIsExplicit) {
          lineNum = motionArgs.repeat - cm.getOption('firstLineNumber');
        }
        return new Pos(lineNum,
                   findFirstNonWhiteSpaceCharacter(cm.getLine(lineNum)));
      },
      moveToStartOfDisplayLine: function(cm) {
        cm.execCommand("goLineLeft");
        return cm.getCursor();
      },
      moveToEndOfDisplayLine: function(cm) {
        cm.execCommand("goLineRight");
        var head = cm.getCursor();
        if (head.sticky == "before") head.ch--;
        return head;
      },
      textObjectManipulation: function(cm, head, motionArgs, vim) {
        // TODO: lots of possible exceptions that can be thrown here. Try da(
        //     outside of a () block.
        var mirroredPairs = {'(': ')', ')': '(',
                             '{': '}', '}': '{',
                             '[': ']', ']': '[',
                             '<': '>', '>': '<'};
        var selfPaired = {'\'': true, '"': true, '`': true};

        var character = motionArgs.selectedCharacter;
        // 'b' refers to  '()' block.
        // 'B' refers to  '{}' block.
        if (character == 'b') {
          character = '(';
        } else if (character == 'B') {
          character = '{';
        }

        // Inclusive is the difference between a and i
        // TODO: Instead of using the additional text object map to perform text
        //     object operations, merge the map into the defaultKeyMap and use
        //     motionArgs to define behavior. Define separate entries for 'aw',
        //     'iw', 'a[', 'i[', etc.
        var inclusive = !motionArgs.textObjectInner;

        var tmp, move;
        if (mirroredPairs[character]) {
          move = true;
          tmp = selectCompanionObject(cm, head, character, inclusive);
          if (!tmp) {
            var sc = cm.getSearchCursor(new RegExp("\\" + character, "g"), head)
            if (sc.find()) {
              tmp = selectCompanionObject(cm, sc.from(), character, inclusive);
            }
          }
        } else if (selfPaired[character]) {
          move = true;
          tmp = findBeginningAndEnd(cm, head, character, inclusive);
        } else if (character === 'W' || character === 'w') {
          var repeat = motionArgs.repeat || 1;
          while (repeat-- > 0) {
            var repeated = expandWordUnderCursor(cm, {
              inclusive,
              innerWord: !inclusive,
              bigWord: character === 'W',
              noSymbol: character === 'W',
              multiline: true
            }, tmp && tmp.end);
            if (repeated) {
              if (!tmp) tmp = repeated;
              tmp.end = repeated.end;
            }
          }
        } else if (character === 'p') {
          tmp = findParagraph(cm, head, motionArgs.repeat, 0, inclusive);
          motionArgs.linewise = true;
          if (vim.visualMode) {
            if (!vim.visualLine) { vim.visualLine = true; }
          } else {
            var operatorArgs = vim.inputState.operatorArgs;
            if (operatorArgs) { operatorArgs.linewise = true; }
            tmp.end.line--;
          }
        } else if (character === 't') {
          tmp = expandTagUnderCursor(cm, head, inclusive);
        } else if (character === 's') {
          // account for cursor on end of sentence symbol
          var content = cm.getLine(head.line);
          if (head.ch > 0 && isEndOfSentenceSymbol(content[head.ch])) {
            head.ch -= 1;
          }
          var end = getSentence(cm, head, motionArgs.repeat, 1, inclusive)
          var start = getSentence(cm, head, motionArgs.repeat, -1, inclusive)
          // closer vim behaviour, 'a' only takes the space after the sentence if there is one before and after
          if (isWhiteSpaceString(cm.getLine(start.line)[start.ch])
              && isWhiteSpaceString(cm.getLine(end.line)[end.ch -1])) {
            start = {line: start.line, ch: start.ch + 1}
          }
          tmp = {start: start, end: end};
        }

        if (!tmp) {
          // No valid text object, don't move.
          return null;
        }

        if (!cm.state.vim.visualMode) {
          return [tmp.start, tmp.end];
        } else {
          return expandSelection(cm, tmp.start, tmp.end, move);
        }
      },

      repeatLastCharacterSearch: function(cm, head, motionArgs) {
        var lastSearch = vimGlobalState.lastCharacterSearch;
        var repeat = motionArgs.repeat;
        var forward = motionArgs.forward === lastSearch.forward;
        var increment = (lastSearch.increment ? 1 : 0) * (forward ? -1 : 1);
        cm.moveH(-increment, 'char');
        motionArgs.inclusive = forward ? true : false;
        var curEnd = moveToCharacter(cm, repeat, forward, lastSearch.selectedCharacter);
        if (!curEnd) {
          cm.moveH(increment, 'char');
          return head;
        }
        curEnd.ch += increment;
        return curEnd;
      }
    };

    function defineMotion(name, fn) {
      motions[name] = fn;
    }

    function fillArray(val, times) {
      var arr = [];
      for (var i = 0; i < times; i++) {
        arr.push(val);
      }
      return arr;
    }
    /**
     * An operator acts on a text selection. It receives the list of selections
     * as input. The corresponding CodeMirror selection is guaranteed to
    * match the input selection.
     */
    var operators = {
      change: function(cm, args, ranges) {
        var finalHead, text;
        var vim = cm.state.vim;
        var anchor = ranges[0].anchor,
            head = ranges[0].head;
        if (!vim.visualMode) {
          text = cm.getRange(anchor, head);
          var lastState = vim.lastEditInputState || {};
          if (lastState.motion == "moveByWords" && !isWhiteSpaceString(text)) {
            // Exclude trailing whitespace if the range is not all whitespace.
            var match = (/\s+$/).exec(text);
            if (match && lastState.motionArgs && lastState.motionArgs.forward) {
              head = offsetCursor(head, 0, - match[0].length);
              text = text.slice(0, - match[0].length);
            }
          }
          if (args.linewise) {
            anchor = new Pos(anchor.line, findFirstNonWhiteSpaceCharacter(cm.getLine(anchor.line)));
            if (head.line > anchor.line) {
              head = new Pos(head.line - 1, Number.MAX_VALUE)
            }
          }
          cm.replaceRange('', anchor, head);
          finalHead = anchor;
        } else if (args.fullLine) {
            head.ch = Number.MAX_VALUE;
            head.line--;
            cm.setSelection(anchor, head)
            text = cm.getSelection();
            cm.replaceSelection("");
            finalHead = anchor;
        } else {
          text = cm.getSelection();
          var replacement = fillArray('', ranges.length);
          cm.replaceSelections(replacement);
          finalHead = cursorMin(ranges[0].head, ranges[0].anchor);
        }
        vimGlobalState.registerController.pushText(
            args.registerName, 'change', text,
            args.linewise, ranges.length > 1);
        actions.enterInsertMode(cm, {head: finalHead}, cm.state.vim);
      },
      // delete is a javascript keyword.
      'delete': function(cm, args, ranges) {
        var finalHead, text;
        var vim = cm.state.vim;
        if (!vim.visualBlock) {
          var anchor = ranges[0].anchor,
              head = ranges[0].head;
          if (args.linewise &&
              head.line != cm.firstLine() &&
              anchor.line == cm.lastLine() &&
              anchor.line == head.line - 1) {
            // Special case for dd on last line (and first line).
            if (anchor.line == cm.firstLine()) {
              anchor.ch = 0;
            } else {
              anchor = new Pos(anchor.line - 1, lineLength(cm, anchor.line - 1));
            }
          }
          text = cm.getRange(anchor, head);
          cm.replaceRange('', anchor, head);
          finalHead = anchor;
          if (args.linewise) {
            finalHead = motions.moveToFirstNonWhiteSpaceCharacter(cm, anchor);
          }
        } else {
          text = cm.getSelection();
          var replacement = fillArray('', ranges.length);
          cm.replaceSelections(replacement);
          finalHead = cursorMin(ranges[0].head, ranges[0].anchor);
        }
        vimGlobalState.registerController.pushText(
            args.registerName, 'delete', text,
            args.linewise, vim.visualBlock);
        return clipCursorToContent(cm, finalHead);
      },
      indent: function(cm, args, ranges) {
        var vim = cm.state.vim;
        // In visual mode, n> shifts the selection right n times, instead of
        // shifting n lines right once.
        var repeat = (vim.visualMode) ? args.repeat : 1;
        if (vim.visualBlock) {
          var tabSize = cm.getOption('tabSize');
          var indent = cm.getOption('indentWithTabs') ? '\t' : ' '.repeat(tabSize);
          var cursor;
          for (var i = ranges.length - 1; i >= 0; i--) {
            cursor = cursorMin(ranges[i].anchor, ranges[i].head);
            if (args.indentRight) {
              cm.replaceRange(indent.repeat(repeat), cursor, cursor);
            } else {
              var text = cm.getLine(cursor.line);
              var end = 0;
              for (var j = 0; j < repeat; j++) {
                var ch = text[cursor.ch + end];
                if (ch == '\t') {
                  end++;
                } else if (ch == ' ') {
                  end++;
                  for (var k = 1; k < indent.length; k++) {
                    ch = text[cursor.ch + end];
                    if (ch !== ' ') break;
                    end++;
                  }
                } else {
                  break
                }
              }
              cm.replaceRange('', cursor, offsetCursor(cursor, 0, end));
            }
          }
          return cursor;
        } else if (cm.indentMore) {
          for (var j = 0; j < repeat; j++) {
            if (args.indentRight) cm.indentMore();
            else cm.indentLess();
          }
        } else {
          var startLine = ranges[0].anchor.line;
          var endLine = vim.visualBlock ?
            ranges[ranges.length - 1].anchor.line :
            ranges[0].head.line;
          if (args.linewise) {
            // The only way to delete a newline is to delete until the start of
            // the next line, so in linewise mode evalInput will include the next
            // line. We don't want this in indent, so we go back a line.
            endLine--;
          }
          for (var i = startLine; i <= endLine; i++) {
            for (var j = 0; j < repeat; j++) {
              cm.indentLine(i, args.indentRight);
            }
          }
        }
        return motions.moveToFirstNonWhiteSpaceCharacter(cm, ranges[0].anchor);
      },
      indentAuto: function(cm, _args, ranges) {
        cm.execCommand("indentAuto");
        return motions.moveToFirstNonWhiteSpaceCharacter(cm, ranges[0].anchor);
      },
      hardWrap: function(cm, operatorArgs, ranges, oldAnchor, newHead) {
        if (!cm.hardWrap) return;
        var from = ranges[0].anchor.line;
        var to = ranges[0].head.line;
        if (operatorArgs.linewise) to--;
        var endRow = cm.hardWrap({from: from, to: to});
        if (endRow > from && operatorArgs.linewise) endRow--;
        return operatorArgs.keepCursor ? oldAnchor : new Pos(endRow, 0);
      },
      changeCase: function(cm, args, ranges, oldAnchor, newHead) {
        var selections = cm.getSelections();
        var swapped = [];
        var toLower = args.toLower;
        for (var j = 0; j < selections.length; j++) {
          var toSwap = selections[j];
          var text = '';
          if (toLower === true) {
            text = toSwap.toLowerCase();
          } else if (toLower === false) {
            text = toSwap.toUpperCase();
          } else {
            for (var i = 0; i < toSwap.length; i++) {
              var character = toSwap.charAt(i);
              text += isUpperCase(character) ? character.toLowerCase() :
                  character.toUpperCase();
            }
          }
          swapped.push(text);
        }
        cm.replaceSelections(swapped);
        if (args.shouldMoveCursor){
          return newHead;
        } else if (!cm.state.vim.visualMode && args.linewise && ranges[0].anchor.line + 1 == ranges[0].head.line) {
          return motions.moveToFirstNonWhiteSpaceCharacter(cm, oldAnchor);
        } else if (args.linewise){
          return oldAnchor;
        } else {
          return cursorMin(ranges[0].anchor, ranges[0].head);
        }
      },
      yank: function(cm, args, ranges, oldAnchor) {
        var vim = cm.state.vim;
        var text = cm.getSelection();
        var endPos = vim.visualMode
          ? cursorMin(vim.sel.anchor, vim.sel.head, ranges[0].head, ranges[0].anchor)
          : oldAnchor;
        vimGlobalState.registerController.pushText(
            args.registerName, 'yank',
            text, args.linewise, vim.visualBlock);
        return endPos;
      }
    };

    function defineOperator(name, fn) {
      operators[name] = fn;
    }

    var actions = {
      jumpListWalk: function(cm, actionArgs, vim) {
        if (vim.visualMode) {
          return;
        }
        var repeat = actionArgs.repeat;
        var forward = actionArgs.forward;
        var jumpList = vimGlobalState.jumpList;

        var mark = jumpList.move(cm, forward ? repeat : -repeat);
        var markPos = mark ? mark.find() : undefined;
        markPos = markPos ? markPos : cm.getCursor();
        cm.setCursor(markPos);
        cm.ace.curOp.command.scrollIntoView = "center-animate"; // ace_patch
      },
      scroll: function(cm, actionArgs, vim) {
        if (vim.visualMode) {
          return;
        }
        var repeat = actionArgs.repeat || 1;
        var lineHeight = cm.defaultTextHeight();
        var top = cm.getScrollInfo().top;
        var delta = lineHeight * repeat;
        var newPos = actionArgs.forward ? top + delta : top - delta;
        var cursor = copyCursor(cm.getCursor());
        var cursorCoords = cm.charCoords(cursor, 'local');
        if (actionArgs.forward) {
          if (newPos > cursorCoords.top) {
             cursor.line += (newPos - cursorCoords.top) / lineHeight;
             cursor.line = Math.ceil(cursor.line);
             cm.setCursor(cursor);
             cursorCoords = cm.charCoords(cursor, 'local');
             cm.scrollTo(null, cursorCoords.top);
          } else {
             // Cursor stays within bounds.  Just reposition the scroll window.
             cm.scrollTo(null, newPos);
          }
        } else {
          var newBottom = newPos + cm.getScrollInfo().clientHeight;
          if (newBottom < cursorCoords.bottom) {
             cursor.line -= (cursorCoords.bottom - newBottom) / lineHeight;
             cursor.line = Math.floor(cursor.line);
             cm.setCursor(cursor);
             cursorCoords = cm.charCoords(cursor, 'local');
             cm.scrollTo(
                 null, cursorCoords.bottom - cm.getScrollInfo().clientHeight);
          } else {
             // Cursor stays within bounds.  Just reposition the scroll window.
             cm.scrollTo(null, newPos);
          }
        }
      },
      scrollToCursor: function(cm, actionArgs) {
        var lineNum = cm.getCursor().line;
        var charCoords = cm.charCoords(new Pos(lineNum, 0), 'local');
        var height = cm.getScrollInfo().clientHeight;
        var y = charCoords.top;
        switch (actionArgs.position) {
          case 'center': y = charCoords.bottom - height / 2;
            break;
          case 'bottom':
            var lineLastCharPos = new Pos(lineNum, cm.getLine(lineNum).length - 1);
            var lineLastCharCoords = cm.charCoords(lineLastCharPos, 'local');
            var lineHeight = lineLastCharCoords.bottom - y;
            y = y - height + lineHeight
            break;
        }
        cm.scrollTo(null, y);
      },
      replayMacro: function(cm, actionArgs, vim) {
        var registerName = actionArgs.selectedCharacter;
        var repeat = actionArgs.repeat;
        var macroModeState = vimGlobalState.macroModeState;
        if (registerName == '@') {
          registerName = macroModeState.latestRegister;
        } else {
          macroModeState.latestRegister = registerName;
        }
        while(repeat--){
          executeMacroRegister(cm, vim, macroModeState, registerName);
        }
      },
      enterMacroRecordMode: function(cm, actionArgs) {
        var macroModeState = vimGlobalState.macroModeState;
        var registerName = actionArgs.selectedCharacter;
        if (vimGlobalState.registerController.isValidRegister(registerName)) {
          macroModeState.enterMacroRecordMode(cm, registerName);
        }
      },
      toggleOverwrite: function(cm) {
        if (!cm.state.overwrite) {
          cm.toggleOverwrite(true);
          cm.setOption('keyMap', 'vim-replace');
          CodeMirror.signal(cm, "vim-mode-change", {mode: "replace"});
        } else {
          cm.toggleOverwrite(false);
          cm.setOption('keyMap', 'vim-insert');
          CodeMirror.signal(cm, "vim-mode-change", {mode: "insert"});
        }
      },
      enterInsertMode: function(cm, actionArgs, vim) {
        if (cm.getOption('readOnly')) { return; }
        vim.insertMode = true;
        vim.insertModeRepeat = actionArgs && actionArgs.repeat || 1;
        var insertAt = (actionArgs) ? actionArgs.insertAt : null;
        var sel = vim.sel;
        var head = actionArgs.head || cm.getCursor('head');
        var height = cm.listSelections().length;
        if (insertAt == 'eol') {
          head = new Pos(head.line, lineLength(cm, head.line));
        } else if (insertAt == 'bol') {
          head = new Pos(head.line, 0);
        } else if (insertAt == 'charAfter') {
          var newPosition = updateSelectionForSurrogateCharacters(cm, head, offsetCursor(head, 0, 1));
          head = newPosition.end;
        } else if (insertAt == 'firstNonBlank') {
          var newPosition = updateSelectionForSurrogateCharacters(cm, head, motions.moveToFirstNonWhiteSpaceCharacter(cm, head));
          head = newPosition.end;
        } else if (insertAt == 'startOfSelectedArea') {
          if (!vim.visualMode)
              return;
          if (!vim.visualBlock) {
            if (sel.head.line < sel.anchor.line) {
              head = sel.head;
            } else {
              head = new Pos(sel.anchor.line, 0);
            }
          } else {
            head = new Pos(
                Math.min(sel.head.line, sel.anchor.line),
                Math.min(sel.head.ch, sel.anchor.ch));
            height = Math.abs(sel.head.line - sel.anchor.line) + 1;
          }
        } else if (insertAt == 'endOfSelectedArea') {
            if (!vim.visualMode)
              return;
          if (!vim.visualBlock) {
            if (sel.head.line >= sel.anchor.line) {
              head = offsetCursor(sel.head, 0, 1);
            } else {
              head = new Pos(sel.anchor.line, 0);
            }
          } else {
            head = new Pos(
                Math.min(sel.head.line, sel.anchor.line),
                Math.max(sel.head.ch, sel.anchor.ch) + 1);
            height = Math.abs(sel.head.line - sel.anchor.line) + 1;
          }
        } else if (insertAt == 'inplace') {
          if (vim.visualMode){
            return;
          }
        } else if (insertAt == 'lastEdit') {
          head = getLastEditPos(cm) || head;
        }
        cm.setOption('disableInput', false);
        if (actionArgs && actionArgs.replace) {
          // Handle Replace-mode as a special case of insert mode.
          cm.toggleOverwrite(true);
          cm.setOption('keyMap', 'vim-replace');
          CodeMirror.signal(cm, "vim-mode-change", {mode: "replace"});
        } else {
          cm.toggleOverwrite(false);
          cm.setOption('keyMap', 'vim-insert');
          CodeMirror.signal(cm, "vim-mode-change", {mode: "insert"});
        }
        if (!vimGlobalState.macroModeState.isPlaying) {
          // Only record if not replaying.
          cm.on('change', onChange);
          if (vim.insertEnd) vim.insertEnd.clear();
          vim.insertEnd = cm.setBookmark(head, {insertLeft: true});
          CodeMirror.on(cm.getInputField(), 'keydown', onKeyEventTargetKeyDown);
        }
        if (vim.visualMode) {
          exitVisualMode(cm);
        }
        selectForInsert(cm, head, height);
      },
      toggleVisualMode: function(cm, actionArgs, vim) {
        var repeat = actionArgs.repeat;
        var anchor = cm.getCursor();
        var head;
        // TODO: The repeat should actually select number of characters/lines
        //     equal to the repeat times the size of the previous visual
        //     operation.
        if (!vim.visualMode) {
          // Entering visual mode
          vim.visualMode = true;
          vim.visualLine = !!actionArgs.linewise;
          vim.visualBlock = !!actionArgs.blockwise;
          head = clipCursorToContent(
              cm, new Pos(anchor.line, anchor.ch + repeat - 1));
          var newPosition = updateSelectionForSurrogateCharacters(cm, anchor, head)
          vim.sel = {
            anchor: newPosition.start,
            head: newPosition.end
          };
          CodeMirror.signal(cm, "vim-mode-change", {mode: "visual", subMode: vim.visualLine ? "linewise" : vim.visualBlock ? "blockwise" : ""});
          updateCmSelection(cm);
          updateMark(cm, vim, '<', cursorMin(anchor, head));
          updateMark(cm, vim, '>', cursorMax(anchor, head));
        } else if (vim.visualLine ^ actionArgs.linewise ||
            vim.visualBlock ^ actionArgs.blockwise) {
          // Toggling between modes
          vim.visualLine = !!actionArgs.linewise;
          vim.visualBlock = !!actionArgs.blockwise;
          CodeMirror.signal(cm, "vim-mode-change", {mode: "visual", subMode: vim.visualLine ? "linewise" : vim.visualBlock ? "blockwise" : ""});
          updateCmSelection(cm);
        } else {
          exitVisualMode(cm);
        }
      },
      reselectLastSelection: function(cm, _actionArgs, vim) {
        var lastSelection = vim.lastSelection;
        if (vim.visualMode) {
          updateLastSelection(cm, vim);
        }
        if (lastSelection) {
          var anchor = lastSelection.anchorMark.find();
          var head = lastSelection.headMark.find();
          if (!anchor || !head) {
            // If the marks have been destroyed due to edits, do nothing.
            return;
          }
          vim.sel = {
            anchor: anchor,
            head: head
          };
          vim.visualMode = true;
          vim.visualLine = lastSelection.visualLine;
          vim.visualBlock = lastSelection.visualBlock;
          updateCmSelection(cm);
          updateMark(cm, vim, '<', cursorMin(anchor, head));
          updateMark(cm, vim, '>', cursorMax(anchor, head));
          CodeMirror.signal(cm, 'vim-mode-change', {
            mode: 'visual',
            subMode: vim.visualLine ? 'linewise' :
                     vim.visualBlock ? 'blockwise' : ''});
        }
      },
      joinLines: function(cm, actionArgs, vim) {
        var curStart, curEnd;
        if (vim.visualMode) {
          curStart = cm.getCursor('anchor');
          curEnd = cm.getCursor('head');
          if (cursorIsBefore(curEnd, curStart)) {
            var tmp = curEnd;
            curEnd = curStart;
            curStart = tmp;
          }
          curEnd.ch = lineLength(cm, curEnd.line) - 1;
        } else {
          // Repeat is the number of lines to join. Minimum 2 lines.
          var repeat = Math.max(actionArgs.repeat, 2);
          curStart = cm.getCursor();
          curEnd = clipCursorToContent(cm, new Pos(curStart.line + repeat - 1,
                                               Infinity));
        }
        var finalCh = 0;
        for (var i = curStart.line; i < curEnd.line; i++) {
          finalCh = lineLength(cm, curStart.line);
          var text = '';
          var nextStartCh = 0;
          if (!actionArgs.keepSpaces) {
            var nextLine = cm.getLine(curStart.line + 1);
            nextStartCh = nextLine.search(/\S/);
            if (nextStartCh == -1) {
              nextStartCh = nextLine.length;
            } else {
              text = " ";
            }
          }
          cm.replaceRange(text, 
            new Pos(curStart.line, finalCh),
            new Pos(curStart.line + 1, nextStartCh));
        }
        var curFinalPos = clipCursorToContent(cm, new Pos(curStart.line, finalCh));
        if (vim.visualMode) {
          exitVisualMode(cm, false);
        }
        cm.setCursor(curFinalPos);
      },
      newLineAndEnterInsertMode: function(cm, actionArgs, vim) {
        vim.insertMode = true;
        var insertAt = copyCursor(cm.getCursor());
        if (insertAt.line === cm.firstLine() && !actionArgs.after) {
          // Special case for inserting newline before start of document.
          cm.replaceRange('\n', new Pos(cm.firstLine(), 0));
          cm.setCursor(cm.firstLine(), 0);
        } else {
          insertAt.line = (actionArgs.after) ? insertAt.line :
              insertAt.line - 1;
          insertAt.ch = lineLength(cm, insertAt.line);
          cm.setCursor(insertAt);
          var newlineFn = CodeMirror.commands.newlineAndIndentContinueComment ||
              CodeMirror.commands.newlineAndIndent;
          newlineFn(cm);
        }
        this.enterInsertMode(cm, { repeat: actionArgs.repeat }, vim);
      },
      paste: function(cm, actionArgs, vim) {
        var register = vimGlobalState.registerController.getRegister(
            actionArgs.registerName);
        var fallback = () => {
          var text = register.toString();
          this.continuePaste(cm, actionArgs, vim, text, register);
        }
        if (actionArgs.registerName === '+' &&
              typeof navigator !== 'undefined' &&
              typeof navigator.clipboard !== 'undefined' &&
              typeof navigator.clipboard.readText === 'function') {
          navigator.clipboard.readText().then((value) => {
            this.continuePaste(cm, actionArgs, vim, value, register);
          }, () => { fallback() })
        } else {
          fallback()
        }
      },
      continuePaste: function(cm, actionArgs, vim, text, register) {
        var cur = copyCursor(cm.getCursor());
        if (!text) {
          return;
        }
        if (actionArgs.matchIndent) {
          var tabSize = cm.getOption("tabSize");
          // length that considers tabs and tabSize
          var whitespaceLength = function(str) {
            var tabs = (str.split("\t").length - 1);
            var spaces = (str.split(" ").length - 1);
            return tabs * tabSize + spaces * 1;
          };
          var currentLine = cm.getLine(cm.getCursor().line);
          var indent = whitespaceLength(currentLine.match(/^\s*/)[0]);
          // chomp last newline b/c don't want it to match /^\s*/gm
          var chompedText = text.replace(/\n$/, '');
          var wasChomped = text !== chompedText;
          var firstIndent = whitespaceLength(text.match(/^\s*/)[0]);
          var text = chompedText.replace(/^\s*/gm, function(wspace) {
            var newIndent = indent + (whitespaceLength(wspace) - firstIndent);
            if (newIndent < 0) {
              return "";
            }
            else if (cm.getOption("indentWithTabs")) {
              var quotient = Math.floor(newIndent / tabSize);
              return Array(quotient + 1).join('\t');
            }
            else {
              return Array(newIndent + 1).join(' ');
            }
          });
          text += wasChomped ? "\n" : "";
        }
        if (actionArgs.repeat > 1) {
          var text = Array(actionArgs.repeat + 1).join(text);
        }
        var linewise = register.linewise;
        var blockwise = register.blockwise;
        if (blockwise) {
          text = text.split('\n');
          if (linewise) {
            text.pop();
          }
          for (var i = 0; i < text.length; i++) {
            text[i] = (text[i] == '') ? ' ' : text[i];
          }
          cur.ch += actionArgs.after ? 1 : 0;
          cur.ch = Math.min(lineLength(cm, cur.line), cur.ch);
        } else if (linewise) {
          if(vim.visualMode) {
            text = vim.visualLine ? text.slice(0, -1) : '\n' + text.slice(0, text.length - 1) + '\n';
          } else if (actionArgs.after) {
            // Move the newline at the end to the start instead, and paste just
            // before the newline character of the line we are on right now.
            text = '\n' + text.slice(0, text.length - 1);
            cur.ch = lineLength(cm, cur.line);
          } else {
            cur.ch = 0;
          }
        } else {
          cur.ch += actionArgs.after ? 1 : 0;
        }
        var curPosFinal;
        if (vim.visualMode) {
          //  save the pasted text for reselection if the need arises
          vim.lastPastedText = text;
          var lastSelectionCurEnd;
          var selectedArea = getSelectedAreaRange(cm, vim);
          var selectionStart = selectedArea[0];
          var selectionEnd = selectedArea[1];
          var selectedText = cm.getSelection();
          var selections = cm.listSelections();
          var emptyStrings = new Array(selections.length).join('1').split('1');
          // save the curEnd marker before it get cleared due to cm.replaceRange.
          if (vim.lastSelection) {
            lastSelectionCurEnd = vim.lastSelection.headMark.find();
          }
          // push the previously selected text to unnamed register
          vimGlobalState.registerController.unnamedRegister.setText(selectedText);
          if (blockwise) {
            // first delete the selected text
            cm.replaceSelections(emptyStrings);
            // Set new selections as per the block length of the yanked text
            selectionEnd = new Pos(selectionStart.line + text.length-1, selectionStart.ch);
            cm.setCursor(selectionStart);
            selectBlock(cm, selectionEnd);
            cm.replaceSelections(text);
            curPosFinal = selectionStart;
          } else if (vim.visualBlock) {
            cm.replaceSelections(emptyStrings);
            cm.setCursor(selectionStart);
            cm.replaceRange(text, selectionStart, selectionStart);
            curPosFinal = selectionStart;
          } else {
            cm.replaceRange(text, selectionStart, selectionEnd);
            curPosFinal = cm.posFromIndex(cm.indexFromPos(selectionStart) + text.length - 1);
          }
          // restore the the curEnd marker
          if(lastSelectionCurEnd) {
            vim.lastSelection.headMark = cm.setBookmark(lastSelectionCurEnd);
          }
          if (linewise) {
            curPosFinal.ch=0;
          }
        } else {
          if (blockwise) {
            cm.setCursor(cur);
            for (var i = 0; i < text.length; i++) {
              var line = cur.line+i;
              if (line > cm.lastLine()) {
                cm.replaceRange('\n',  new Pos(line, 0));
              }
              var lastCh = lineLength(cm, line);
              if (lastCh < cur.ch) {
                extendLineToColumn(cm, line, cur.ch);
              }
            }
            cm.setCursor(cur);
            selectBlock(cm, new Pos(cur.line + text.length-1, cur.ch));
            cm.replaceSelections(text);
            curPosFinal = cur;
          } else {
            cm.replaceRange(text, cur);
            // Now fine tune the cursor to where we want it.
            if (linewise) {
              var line = actionArgs.after ? cur.line + 1 : cur.line;
              curPosFinal = new Pos(line, findFirstNonWhiteSpaceCharacter(cm.getLine(line)));
            } else {
              curPosFinal = copyCursor(cur);
              if (!/\n/.test(text)) {
                curPosFinal.ch += text.length - (actionArgs.after ? 1 : 0);
              }
            }
          }
        }
        if (vim.visualMode) {
          exitVisualMode(cm, false);
        }
        cm.setCursor(curPosFinal);
      },
      undo: function(cm, actionArgs) {
        cm.operation(function() {
          repeatFn(cm, CodeMirror.commands.undo, actionArgs.repeat)();
          cm.setCursor(clipCursorToContent(cm, cm.getCursor('start')));
        });
      },
      redo: function(cm, actionArgs) {
        repeatFn(cm, CodeMirror.commands.redo, actionArgs.repeat)();
      },
      setRegister: function(_cm, actionArgs, vim) {
        vim.inputState.registerName = actionArgs.selectedCharacter;
      },
      insertRegister: function(cm, actionArgs, vim) {
        var registerName = actionArgs.selectedCharacter;
        var register = vimGlobalState.registerController.getRegister(registerName);
        var text = register && register.toString();
        if (text) {
          cm.replaceSelection(text);
        }
      },
      oneNormalCommand: function(cm, actionArgs, vim) {
        exitInsertMode(cm, true);
        vim.insertModeReturn = true;
        CodeMirror.on(cm, 'vim-command-done', function handler() {
          if (vim.visualMode) return;
          if (vim.insertModeReturn) {
            vim.insertModeReturn = false;
            if (!vim.insertMode) {
              actions.enterInsertMode(cm, {}, vim);
            }
          }
          CodeMirror.off(cm, 'vim-command-done', handler);
        });
      },
      setMark: function(cm, actionArgs, vim) {
        var markName = actionArgs.selectedCharacter;
        updateMark(cm, vim, markName, cm.getCursor());
      },
      replace: function(cm, actionArgs, vim) {
        var replaceWith = actionArgs.selectedCharacter;
        var curStart = cm.getCursor();
        var replaceTo;
        var curEnd;
        var selections = cm.listSelections();
        if (vim.visualMode) {
          curStart = cm.getCursor('start');
          curEnd = cm.getCursor('end');
        } else {
          var line = cm.getLine(curStart.line);
          replaceTo = curStart.ch + actionArgs.repeat;
          if (replaceTo > line.length) {
            replaceTo=line.length;
          }
          curEnd = new Pos(curStart.line, replaceTo);
        }

        var newPositions = updateSelectionForSurrogateCharacters(cm, curStart, curEnd);
        curStart = newPositions.start;
        curEnd = newPositions.end;
        if (replaceWith=='\n') {
          if (!vim.visualMode) cm.replaceRange('', curStart, curEnd);
          // special case, where vim help says to replace by just one line-break
          (CodeMirror.commands.newlineAndIndentContinueComment || CodeMirror.commands.newlineAndIndent)(cm);
        } else {
          var replaceWithStr = cm.getRange(curStart, curEnd);
          // replace all surrogate characters with selected character
          replaceWithStr = replaceWithStr.replace(/[\uD800-\uDBFF][\uDC00-\uDFFF]/g, replaceWith);
          //replace all characters in range by selected, but keep linebreaks
          replaceWithStr = replaceWithStr.replace(/[^\n]/g, replaceWith);
          if (vim.visualBlock) {
            // Tabs are split in visua block before replacing
            var spaces = new Array(cm.getOption("tabSize")+1).join(' ');
            replaceWithStr = cm.getSelection();
            replaceWithStr = replaceWithStr.replace(/[\uD800-\uDBFF][\uDC00-\uDFFF]/g, replaceWith);
            replaceWithStr = replaceWithStr.replace(/\t/g, spaces).replace(/[^\n]/g, replaceWith).split('\n');
            cm.replaceSelections(replaceWithStr);
          } else {
            cm.replaceRange(replaceWithStr, curStart, curEnd);
          }
          if (vim.visualMode) {
            curStart = cursorIsBefore(selections[0].anchor, selections[0].head) ?
                         selections[0].anchor : selections[0].head;
            cm.setCursor(curStart);
            exitVisualMode(cm, false);
          } else {
            cm.setCursor(offsetCursor(curEnd, 0, -1));
          }
        }
      },
      incrementNumberToken: function(cm, actionArgs) {
        var cur = cm.getCursor();
        var lineStr = cm.getLine(cur.line);
        var re = /(-?)(?:(0x)([\da-f]+)|(0b|0|)(\d+))/gi;
        var match;
        var start;
        var end;
        var numberStr;
        while ((match = re.exec(lineStr)) !== null) {
          start = match.index;
          end = start + match[0].length;
          if (cur.ch < end)break;
        }
        if (!actionArgs.backtrack && (end <= cur.ch))return;
        if (match) {
          var baseStr = match[2] || match[4]
          var digits = match[3] || match[5]
          var increment = actionArgs.increase ? 1 : -1;
          var base = {'0b': 2, '0': 8, '': 10, '0x': 16}[baseStr.toLowerCase()];
          var number = parseInt(match[1] + digits, base) + (increment * actionArgs.repeat);
          numberStr = number.toString(base);
          var zeroPadding = baseStr ? new Array(digits.length - numberStr.length + 1 + match[1].length).join('0') : ''
          if (numberStr.charAt(0) === '-') {
            numberStr = '-' + baseStr + zeroPadding + numberStr.substr(1);
          } else {
            numberStr = baseStr + zeroPadding + numberStr;
          }
          var from = new Pos(cur.line, start);
          var to = new Pos(cur.line, end);
          cm.replaceRange(numberStr, from, to);
        } else {
          return;
        }
        cm.setCursor(new Pos(cur.line, start + numberStr.length - 1));
      },
      repeatLastEdit: function(cm, actionArgs, vim) {
        var lastEditInputState = vim.lastEditInputState;
        if (!lastEditInputState) { return; }
        var repeat = actionArgs.repeat;
        if (repeat && actionArgs.repeatIsExplicit) {
          vim.lastEditInputState.repeatOverride = repeat;
        } else {
          repeat = vim.lastEditInputState.repeatOverride || repeat;
        }
        repeatLastEdit(cm, vim, repeat, false /** repeatForInsert */);
      },
      indent: function(cm, actionArgs) {
        cm.indentLine(cm.getCursor().line, actionArgs.indentRight);
      },
      exitInsertMode: exitInsertMode
    };

    function defineAction(name, fn) {
      actions[name] = fn;
    }

    /*
     * Below are miscellaneous utility functions used by vim.js
     */

    /**
     * Clips cursor to ensure that line is within the buffer's range
     * and is not inside surrogate pair
     * If includeLineBreak is true, then allow cur.ch == lineLength.
     */
    function clipCursorToContent(cm, cur, oldCur) {
      var vim = cm.state.vim;
      var includeLineBreak = vim.insertMode || vim.visualMode;
      var line = Math.min(Math.max(cm.firstLine(), cur.line), cm.lastLine() );
      var text = cm.getLine(line);
      var maxCh = text.length - 1 + Number(!!includeLineBreak);
      var ch = Math.min(Math.max(0, cur.ch), maxCh);
      // prevent cursor from entering surrogate pair
      var charCode = text.charCodeAt(ch);
      if (0xDC00 <= charCode && charCode <= 0xDFFF) {
        var direction = 1;
        if (oldCur && oldCur.line == line && oldCur.ch > ch) {
          direction = -1;
        }
        ch +=direction;
        if (ch > maxCh) ch -=2;
      }
      return new Pos(line, ch);
    }
    function copyArgs(args) {
      var ret = {};
      for (var prop in args) {
        if (args.hasOwnProperty(prop)) {
          ret[prop] = args[prop];
        }
      }
      return ret;
    }
    function offsetCursor(cur, offsetLine, offsetCh) {
      if (typeof offsetLine === 'object') {
        offsetCh = offsetLine.ch;
        offsetLine = offsetLine.line;
      }
      return new Pos(cur.line + offsetLine, cur.ch + offsetCh);
    }
    function commandMatches(keys, keyMap, context, inputState) {
      // Partial matches are not applied. They inform the key handler
      // that the current key sequence is a subsequence of a valid key
      // sequence, so that the key buffer is not cleared.
      if (inputState.operator) context = "operatorPending";
      var match, partial = [], full = [];
      // if currently expanded key comes from a noremap, searcg only in default keys
      var startIndex = noremap ? keyMap.length - defaultKeymapLength : 0;
      for (var i = startIndex; i < keyMap.length; i++) {
        var command = keyMap[i];
        if (context == 'insert' && command.context != 'insert' ||
            (command.context && command.context != context) ||
            inputState.operator && command.type == 'action' ||
            !(match = commandMatch(keys, command.keys))) { continue; }
        if (match == 'partial') { partial.push(command); }
        if (match == 'full') { full.push(command); }
      }
      return {
        partial: partial.length && partial,
        full: full.length && full
      };
    }
    function commandMatch(pressed, mapped) {
      const isLastCharacter = mapped.slice(-11) == '<character>';
      const isLastRegister = mapped.slice(-10) == '<register>';
      if (isLastCharacter || isLastRegister) {
        // Last character matches anything.
        var prefixLen = mapped.length - (isLastCharacter ? 11 : 10);
        var pressedPrefix = pressed.slice(0, prefixLen);
        var mappedPrefix = mapped.slice(0, prefixLen);
        return pressedPrefix == mappedPrefix && pressed.length > prefixLen ? 'full' :
               mappedPrefix.indexOf(pressedPrefix) == 0 ? 'partial' : false;
      } else {
        return pressed == mapped ? 'full' :
               mapped.indexOf(pressed) == 0 ? 'partial' : false;
      }
    }
    function lastChar(keys) {
      var match = /^.*(<[^>]+>)$/.exec(keys);
      var selectedCharacter = match ? match[1] : keys.slice(-1);
      if (selectedCharacter.length > 1){
        switch(selectedCharacter){
          case '<CR>':
            selectedCharacter='\n';
            break;
          case '<Space>':
            selectedCharacter=' ';
            break;
          default:
            selectedCharacter='';
            break;
        }
      }
      return selectedCharacter;
    }
    function repeatFn(cm, fn, repeat) {
      return function() {
        for (var i = 0; i < repeat; i++) {
          fn(cm);
        }
      };
    }
    function copyCursor(cur) {
      return new Pos(cur.line, cur.ch);
    }
    function cursorEqual(cur1, cur2) {
      return cur1.ch == cur2.ch && cur1.line == cur2.line;
    }
    function cursorIsBefore(cur1, cur2) {
      if (cur1.line < cur2.line) {
        return true;
      }
      if (cur1.line == cur2.line && cur1.ch < cur2.ch) {
        return true;
      }
      return false;
    }
    function cursorMin(cur1, cur2) {
      if (arguments.length > 2) {
        cur2 = cursorMin.apply(undefined, Array.prototype.slice.call(arguments, 1));
      }
      return cursorIsBefore(cur1, cur2) ? cur1 : cur2;
    }
    function cursorMax(cur1, cur2) {
      if (arguments.length > 2) {
        cur2 = cursorMax.apply(undefined, Array.prototype.slice.call(arguments, 1));
      }
      return cursorIsBefore(cur1, cur2) ? cur2 : cur1;
    }
    function cursorIsBetween(cur1, cur2, cur3) {
      // returns true if cur2 is between cur1 and cur3.
      var cur1before2 = cursorIsBefore(cur1, cur2);
      var cur2before3 = cursorIsBefore(cur2, cur3);
      return cur1before2 && cur2before3;
    }
    function lineLength(cm, lineNum) {
      return cm.getLine(lineNum).length;
    }
    function trim(s) {
      if (s.trim) {
        return s.trim();
      }
      return s.replace(/^\s+|\s+$/g, '');
    }
    function escapeRegex(s) {
      return s.replace(/([.?*+$\[\]\/\\(){}|\-])/g, '\\$1');
    }
    function extendLineToColumn(cm, lineNum, column) {
      var endCh = lineLength(cm, lineNum);
      var spaces = new Array(column-endCh+1).join(' ');
      cm.setCursor(new Pos(lineNum, endCh));
      cm.replaceRange(spaces, cm.getCursor());
    }
    // This functions selects a rectangular block
    // of text with selectionEnd as any of its corner
    // Height of block:
    // Difference in selectionEnd.line and first/last selection.line
    // Width of the block:
    // Distance between selectionEnd.ch and any(first considered here) selection.ch
    function selectBlock(cm, selectionEnd) {
      var selections = [], ranges = cm.listSelections();
      var head = copyCursor(cm.clipPos(selectionEnd));
      var isClipped = !cursorEqual(selectionEnd, head);
      var curHead = cm.getCursor('head');
      var primIndex = getIndex(ranges, curHead);
      var wasClipped = cursorEqual(ranges[primIndex].head, ranges[primIndex].anchor);
      var max = ranges.length - 1;
      var index = max - primIndex > primIndex ? max : 0;
      var base = ranges[index].anchor;

      var firstLine = Math.min(base.line, head.line);
      var lastLine = Math.max(base.line, head.line);
      var baseCh = base.ch, headCh = head.ch;

      var dir = ranges[index].head.ch - baseCh;
      var newDir = headCh - baseCh;
      if (dir > 0 && newDir <= 0) {
        baseCh++;
        if (!isClipped) { headCh--; }
      } else if (dir < 0 && newDir >= 0) {
        baseCh--;
        if (!wasClipped) { headCh++; }
      } else if (dir < 0 && newDir == -1) {
        baseCh--;
        headCh++;
      }
      for (var line = firstLine; line <= lastLine; line++) {
        var range = {anchor: new Pos(line, baseCh), head: new Pos(line, headCh)};
        selections.push(range);
      }
      cm.setSelections(selections);
      selectionEnd.ch = headCh;
      base.ch = baseCh;
      return base;
    }
    function selectForInsert(cm, head, height) {
      var sel = [];
      for (var i = 0; i < height; i++) {
        var lineHead = offsetCursor(head, i, 0);
        sel.push({anchor: lineHead, head: lineHead});
      }
      cm.setSelections(sel, 0);
    }
    // getIndex returns the index of the cursor in the selections.
    function getIndex(ranges, cursor, end) {
      for (var i = 0; i < ranges.length; i++) {
        var atAnchor = end != 'head' && cursorEqual(ranges[i].anchor, cursor);
        var atHead = end != 'anchor' && cursorEqual(ranges[i].head, cursor);
        if (atAnchor || atHead) {
          return i;
        }
      }
      return -1;
    }
    function getSelectedAreaRange(cm, vim) {
      var lastSelection = vim.lastSelection;
      var getCurrentSelectedAreaRange = function() {
        var selections = cm.listSelections();
        var start =  selections[0];
        var end = selections[selections.length-1];
        var selectionStart = cursorIsBefore(start.anchor, start.head) ? start.anchor : start.head;
        var selectionEnd = cursorIsBefore(end.anchor, end.head) ? end.head : end.anchor;
        return [selectionStart, selectionEnd];
      };
      var getLastSelectedAreaRange = function() {
        var selectionStart = cm.getCursor();
        var selectionEnd = cm.getCursor();
        var block = lastSelection.visualBlock;
        if (block) {
          var width = block.width;
          var height = block.height;
          selectionEnd = new Pos(selectionStart.line + height, selectionStart.ch + width);
          var selections = [];
          // selectBlock creates a 'proper' rectangular block.
          // We do not want that in all cases, so we manually set selections.
          for (var i = selectionStart.line; i < selectionEnd.line; i++) {
            var anchor = new Pos(i, selectionStart.ch);
            var head = new Pos(i, selectionEnd.ch);
            var range = {anchor: anchor, head: head};
            selections.push(range);
          }
          cm.setSelections(selections);
        } else {
          var start = lastSelection.anchorMark.find();
          var end = lastSelection.headMark.find();
          var line = end.line - start.line;
          var ch = end.ch - start.ch;
          selectionEnd = {line: selectionEnd.line + line, ch: line ? selectionEnd.ch : ch + selectionEnd.ch};
          if (lastSelection.visualLine) {
            selectionStart = new Pos(selectionStart.line, 0);
            selectionEnd = new Pos(selectionEnd.line, lineLength(cm, selectionEnd.line));
          }
          cm.setSelection(selectionStart, selectionEnd);
        }
        return [selectionStart, selectionEnd];
      };
      if (!vim.visualMode) {
      // In case of replaying the action.
        return getLastSelectedAreaRange();
      } else {
        return getCurrentSelectedAreaRange();
      }
    }
    // Updates the previous selection with the current selection's values. This
    // should only be called in visual mode.
    function updateLastSelection(cm, vim) {
      var anchor = vim.sel.anchor;
      var head = vim.sel.head;
      // To accommodate the effect of lastPastedText in the last selection
      if (vim.lastPastedText) {
        head = cm.posFromIndex(cm.indexFromPos(anchor) + vim.lastPastedText.length);
        vim.lastPastedText = null;
      }
      vim.lastSelection = {'anchorMark': cm.setBookmark(anchor),
                           'headMark': cm.setBookmark(head),
                           'anchor': copyCursor(anchor),
                           'head': copyCursor(head),
                           'visualMode': vim.visualMode,
                           'visualLine': vim.visualLine,
                           'visualBlock': vim.visualBlock};
    }
    function expandSelection(cm, start, end, move) {
      var sel = cm.state.vim.sel;
      var head = move ? start: sel.head;
      var anchor = move ? start: sel.anchor;
      var tmp;
      if (cursorIsBefore(end, start)) {
        tmp = end;
        end = start;
        start = tmp;
      }
      if (cursorIsBefore(head, anchor)) {
        head = cursorMin(start, head);
        anchor = cursorMax(anchor, end);
      } else {
        anchor = cursorMin(start, anchor);
        head = cursorMax(head, end);
        head = offsetCursor(head, 0, -1);
        if (head.ch == -1 && head.line != cm.firstLine()) {
          head = new Pos(head.line - 1, lineLength(cm, head.line - 1));
        }
      }
      return [anchor, head];
    }
    /**
     * Updates the CodeMirror selection to match the provided vim selection.
     * If no arguments are given, it uses the current vim selection state.
     */
    function updateCmSelection(cm, sel, mode) {
      var vim = cm.state.vim;
      sel = sel || vim.sel;
      var mode = mode ||
        vim.visualLine ? 'line' : vim.visualBlock ? 'block' : 'char';
      var cmSel = makeCmSelection(cm, sel, mode);
      cm.setSelections(cmSel.ranges, cmSel.primary);
    }
    function makeCmSelection(cm, sel, mode, exclusive) {
      var head = copyCursor(sel.head);
      var anchor = copyCursor(sel.anchor);
      if (mode == 'char') {
        var headOffset = !exclusive && !cursorIsBefore(sel.head, sel.anchor) ? 1 : 0;
        var anchorOffset = cursorIsBefore(sel.head, sel.anchor) ? 1 : 0;
        head = offsetCursor(sel.head, 0, headOffset);
        anchor = offsetCursor(sel.anchor, 0, anchorOffset);
        return {
          ranges: [{anchor: anchor, head: head}],
          primary: 0
        };
      } else if (mode == 'line') {
        if (!cursorIsBefore(sel.head, sel.anchor)) {
          anchor.ch = 0;

          var lastLine = cm.lastLine();
          if (head.line > lastLine) {
            head.line = lastLine;
          }
          head.ch = lineLength(cm, head.line);
        } else {
          head.ch = 0;
          anchor.ch = lineLength(cm, anchor.line);
        }
        return {
          ranges: [{anchor: anchor, head: head}],
          primary: 0
        };
      } else if (mode == 'block') {
        var top = Math.min(anchor.line, head.line),
            fromCh = anchor.ch,
            bottom = Math.max(anchor.line, head.line),
            toCh = head.ch;
        if (fromCh < toCh) { toCh += 1 }
        else { fromCh += 1 };
        var height = bottom - top + 1;
        var primary = head.line == top ? 0 : height - 1;
        var ranges = [];
        for (var i = 0; i < height; i++) {
          ranges.push({
            anchor: new Pos(top + i, fromCh),
            head: new Pos(top + i, toCh)
          });
        }
        return {
          ranges: ranges,
          primary: primary
        };
      }
    }
    function getHead(cm) {
      var cur = cm.getCursor('head');
      if (cm.getSelection().length == 1) {
        // Small corner case when only 1 character is selected. The "real"
        // head is the left of head and anchor.
        cur = cursorMin(cur, cm.getCursor('anchor'));
      }
      return cur;
    }

    /**
     * If moveHead is set to false, the CodeMirror selection will not be
     * touched. The caller assumes the responsibility of putting the cursor
    * in the right place.
     */
    function exitVisualMode(cm, moveHead) {
      var vim = cm.state.vim;
      if (moveHead !== false) {
        cm.setCursor(clipCursorToContent(cm, vim.sel.head));
      }
      updateLastSelection(cm, vim);
      vim.visualMode = false;
      vim.visualLine = false;
      vim.visualBlock = false;
      if (!vim.insertMode) CodeMirror.signal(cm, "vim-mode-change", {mode: "normal"});
    }

    // Remove any trailing newlines from the selection. For
    // example, with the caret at the start of the last word on the line,
    // 'dw' should word, but not the newline, while 'w' should advance the
    // caret to the first character of the next line.
    function clipToLine(cm, curStart, curEnd) {
      var selection = cm.getRange(curStart, curEnd);
      // Only clip if the selection ends with trailing newline + whitespace
      if (/\n\s*$/.test(selection)) {
        var lines = selection.split('\n');
        // We know this is all whitespace.
        lines.pop();

        // Cases:
        // 1. Last word is an empty line - do not clip the trailing '\n'
        // 2. Last word is not an empty line - clip the trailing '\n'
        var line;
        // Find the line containing the last word, and clip all whitespace up
        // to it.
        for (var line = lines.pop(); lines.length > 0 && line && isWhiteSpaceString(line); line = lines.pop()) {
          curEnd.line--;
          curEnd.ch = 0;
        }
        // If the last word is not an empty line, clip an additional newline
        if (line) {
          curEnd.line--;
          curEnd.ch = lineLength(cm, curEnd.line);
        } else {
          curEnd.ch = 0;
        }
      }
    }

    // Expand the selection to line ends.
    function expandSelectionToLine(_cm, curStart, curEnd) {
      curStart.ch = 0;
      curEnd.ch = 0;
      curEnd.line++;
    }

    function findFirstNonWhiteSpaceCharacter(text) {
      if (!text) {
        return 0;
      }
      var firstNonWS = text.search(/\S/);
      return firstNonWS == -1 ? text.length : firstNonWS;
    }

    function expandWordUnderCursor(cm, {inclusive, innerWord, bigWord, noSymbol, multiline}, cursor) {
      var cur = cursor || getHead(cm);
      var line = cm.getLine(cur.line);
      var endLine = line;
      var startLineNumber = cur.line
      var endLineNumber = startLineNumber;
      var idx = cur.ch;

      var wordOnNextLine;
      // Seek to first word or non-whitespace character, depending on if
      // noSymbol is true.
      var test = noSymbol ? wordCharTest[0] : bigWordCharTest [0];
      if (innerWord && /\s/.test(line.charAt(idx))) {
        test = function(ch) { return /\s/.test(ch); };
      } else {
        while (!test(line.charAt(idx))) {
          idx++;
          if (idx >= line.length) {
            if (!multiline) return null;
            idx--;
            wordOnNextLine = findWord(cm, cur, true, bigWord, true);
            break
          }
        }

        if (bigWord) {
          test = bigWordCharTest[0];
        } else {
          test = wordCharTest[0];
          if (!test(line.charAt(idx))) {
            test = wordCharTest[1];
          }
        }
      }

      var end = idx, start = idx;
      while (test(line.charAt(start)) && start >= 0) { start--; }
      start++;
      if (wordOnNextLine) {
        end = wordOnNextLine.to;
        endLineNumber = wordOnNextLine.line;
        endLine = cm.getLine(endLineNumber);
        if (!endLine && end == 0) end++;
      } else {
        while (test(line.charAt(end)) && end < line.length) { end++; }
      }

      if (inclusive) {
        // If present, include all whitespace after word.
        // Otherwise, include all whitespace before word, except indentation.
        var wordEnd = end;
        var startsWithSpace = cur.ch <= start && /\s/.test(line.charAt(cur.ch));
        if (!startsWithSpace) {
          while (/\s/.test(endLine.charAt(end)) && end < endLine.length) { end++; }
        }
        if (wordEnd == end || startsWithSpace) {
          var wordStart = start;
          while (/\s/.test(line.charAt(start - 1)) && start > 0) { start--; }
          if (!start && !startsWithSpace) { start = wordStart; }
        }
      }

      return { start: new Pos(startLineNumber, start), end: new Pos(endLineNumber, end) };
    }

    /**
     * Depends on the following:
     *
     * - editor mode should be htmlmixedmode / xml
     * - mode/xml/xml.js should be loaded
     * - addon/fold/xml-fold.js should be loaded
     *
     * If any of the above requirements are not true, this function noops.
     *
     * This is _NOT_ a 100% accurate implementation of vim tag text objects.
     * The following caveats apply (based off cursory testing, I'm sure there
     * are other discrepancies):
     *
     * - Does not work inside comments:
     *   ```
     *   <!-- <div>broken</div> -->
     *   ```
     * - Does not work when tags have different cases:
     *   ```
     *   <div>broken</DIV>
     *   ```
     * - Does not work when cursor is inside a broken tag:
     *   ```
     *   <div><brok><en></div>
     *   ```
     */
    function expandTagUnderCursor(cm, head, inclusive) {
      var cur = head;
      if (!CodeMirror.findMatchingTag || !CodeMirror.findEnclosingTag) {
        return { start: cur, end: cur };
      }

      var tags = CodeMirror.findMatchingTag(cm, head) || CodeMirror.findEnclosingTag(cm, head);
      if (!tags || !tags.open || !tags.close) {
        return { start: cur, end: cur };
      }

      if (inclusive) {
        return { start: tags.open.from, end: tags.close.to };
      }
      return { start: tags.open.to, end: tags.close.from };
    }

    function recordJumpPosition(cm, oldCur, newCur) {
      if (!cursorEqual(oldCur, newCur)) {
        vimGlobalState.jumpList.add(cm, oldCur, newCur);
      }
    }

    function recordLastCharacterSearch(increment, args) {
        vimGlobalState.lastCharacterSearch.increment = increment;
        vimGlobalState.lastCharacterSearch.forward = args.forward;
        vimGlobalState.lastCharacterSearch.selectedCharacter = args.selectedCharacter;
    }

    var symbolToMode = {
        '(': 'bracket', ')': 'bracket', '{': 'bracket', '}': 'bracket',
        '[': 'section', ']': 'section',
        '*': 'comment', '/': 'comment',
        'm': 'method', 'M': 'method',
        '#': 'preprocess'
    };
    var findSymbolModes = {
      bracket: {
        isComplete: function(state) {
          if (state.nextCh === state.symb) {
            state.depth++;
            if (state.depth >= 1)return true;
          } else if (state.nextCh === state.reverseSymb) {
            state.depth--;
          }
          return false;
        }
      },
      section: {
        init: function(state) {
          state.curMoveThrough = true;
          state.symb = (state.forward ? ']' : '[') === state.symb ? '{' : '}';
        },
        isComplete: function(state) {
          return state.index === 0 && state.nextCh === state.symb;
        }
      },
      comment: {
        isComplete: function(state) {
          var found = state.lastCh === '*' && state.nextCh === '/';
          state.lastCh = state.nextCh;
          return found;
        }
      },
      // TODO: The original Vim implementation only operates on level 1 and 2.
      // The current implementation doesn't check for code block level and
      // therefore it operates on any levels.
      method: {
        init: function(state) {
          state.symb = (state.symb === 'm' ? '{' : '}');
          state.reverseSymb = state.symb === '{' ? '}' : '{';
        },
        isComplete: function(state) {
          if (state.nextCh === state.symb)return true;
          return false;
        }
      },
      preprocess: {
        init: function(state) {
          state.index = 0;
        },
        isComplete: function(state) {
          if (state.nextCh === '#') {
            var token = state.lineText.match(/^#(\w+)/)[1];
            if (token === 'endif') {
              if (state.forward && state.depth === 0) {
                return true;
              }
              state.depth++;
            } else if (token === 'if') {
              if (!state.forward && state.depth === 0) {
                return true;
              }
              state.depth--;
            }
            if (token === 'else' && state.depth === 0)return true;
          }
          return false;
        }
      }
    };
    function findSymbol(cm, repeat, forward, symb) {
      var cur = copyCursor(cm.getCursor());
      var increment = forward ? 1 : -1;
      var endLine = forward ? cm.lineCount() : -1;
      var curCh = cur.ch;
      var line = cur.line;
      var lineText = cm.getLine(line);
      var state = {
        lineText: lineText,
        nextCh: lineText.charAt(curCh),
        lastCh: null,
        index: curCh,
        symb: symb,
        reverseSymb: (forward ?  { ')': '(', '}': '{' } : { '(': ')', '{': '}' })[symb],
        forward: forward,
        depth: 0,
        curMoveThrough: false
      };
      var mode = symbolToMode[symb];
      if (!mode)return cur;
      var init = findSymbolModes[mode].init;
      var isComplete = findSymbolModes[mode].isComplete;
      if (init) { init(state); }
      while (line !== endLine && repeat) {
        state.index += increment;
        state.nextCh = state.lineText.charAt(state.index);
        if (!state.nextCh) {
          line += increment;
          state.lineText = cm.getLine(line) || '';
          if (increment > 0) {
            state.index = 0;
          } else {
            var lineLen = state.lineText.length;
            state.index = (lineLen > 0) ? (lineLen-1) : 0;
          }
          state.nextCh = state.lineText.charAt(state.index);
        }
        if (isComplete(state)) {
          cur.line = line;
          cur.ch = state.index;
          repeat--;
        }
      }
      if (state.nextCh || state.curMoveThrough) {
        return new Pos(line, state.index);
      }
      return cur;
    }

    /*
     * Returns the boundaries of the next word. If the cursor in the middle of
     * the word, then returns the boundaries of the current word, starting at
     * the cursor. If the cursor is at the start/end of a word, and we are going
     * forward/backward, respectively, find the boundaries of the next word.
     *
     * @param {CodeMirror} cm CodeMirror object.
     * @param {Cursor} cur The cursor position.
     * @param {boolean} forward True to search forward. False to search
     *     backward.
     * @param {boolean} bigWord True if punctuation count as part of the word.
     *     False if only [a-zA-Z0-9] characters count as part of the word.
     * @param {boolean} emptyLineIsWord True if empty lines should be treated
     *     as words.
     * @return {Object{from:number, to:number, line: number}} The boundaries of
     *     the word, or null if there are no more words.
     */
    function findWord(cm, cur, forward, bigWord, emptyLineIsWord) {
      var lineNum = cur.line;
      var pos = cur.ch;
      var line = cm.getLine(lineNum);
      var dir = forward ? 1 : -1;
      var charTests = bigWord ? bigWordCharTest: wordCharTest;

      if (emptyLineIsWord && line == '') {
        lineNum += dir;
        line = cm.getLine(lineNum);
        if (!isLine(cm, lineNum)) {
          return null;
        }
        pos = (forward) ? 0 : line.length;
      }

      while (true) {
        if (emptyLineIsWord && line == '') {
          return { from: 0, to: 0, line: lineNum };
        }
        var stop = (dir > 0) ? line.length : -1;
        var wordStart = stop, wordEnd = stop;
        // Find bounds of next word.
        while (pos != stop) {
          var foundWord = false;
          for (var i = 0; i < charTests.length && !foundWord; ++i) {
            if (charTests[i](line.charAt(pos))) {
              wordStart = pos;
              // Advance to end of word.
              while (pos != stop && charTests[i](line.charAt(pos))) {
                pos += dir;
              }
              wordEnd = pos;
              foundWord = wordStart != wordEnd;
              if (wordStart == cur.ch && lineNum == cur.line &&
                  wordEnd == wordStart + dir) {
                // We started at the end of a word. Find the next one.
                continue;
              } else {
                return {
                  from: Math.min(wordStart, wordEnd + 1),
                  to: Math.max(wordStart, wordEnd),
                  line: lineNum };
              }
            }
          }
          if (!foundWord) {
            pos += dir;
          }
        }
        // Advance to next/prev line.
        lineNum += dir;
        if (!isLine(cm, lineNum)) {
          return null;
        }
        line = cm.getLine(lineNum);
        pos = (dir > 0) ? 0 : line.length;
      }
    }

    /**
     * @param {CodeMirror} cm CodeMirror object.
     * @param {Pos} cur The position to start from.
     * @param {int} repeat Number of words to move past.
     * @param {boolean} forward True to search forward. False to search
     *     backward.
     * @param {boolean} wordEnd True to move to end of word. False to move to
     *     beginning of word.
     * @param {boolean} bigWord True if punctuation count as part of the word.
     *     False if only alphabet characters count as part of the word.
     * @return {Cursor} The position the cursor should move to.
     */
    function moveToWord(cm, cur, repeat, forward, wordEnd, bigWord) {
      var curStart = copyCursor(cur);
      var words = [];
      if (forward && !wordEnd || !forward && wordEnd) {
        repeat++;
      }
      // For 'e', empty lines are not considered words, go figure.
      var emptyLineIsWord = !(forward && wordEnd);
      for (var i = 0; i < repeat; i++) {
        var word = findWord(cm, cur, forward, bigWord, emptyLineIsWord);
        if (!word) {
          var eodCh = lineLength(cm, cm.lastLine());
          words.push(forward
              ? {line: cm.lastLine(), from: eodCh, to: eodCh}
              : {line: 0, from: 0, to: 0});
          break;
        }
        words.push(word);
        cur = new Pos(word.line, forward ? (word.to - 1) : word.from);
      }
      var shortCircuit = words.length != repeat;
      var firstWord = words[0];
      var lastWord = words.pop();
      if (forward && !wordEnd) {
        // w
        if (!shortCircuit && (firstWord.from != curStart.ch || firstWord.line != curStart.line)) {
          // We did not start in the middle of a word. Discard the extra word at the end.
          lastWord = words.pop();
        }
        return new Pos(lastWord.line, lastWord.from);
      } else if (forward && wordEnd) {
        return new Pos(lastWord.line, lastWord.to - 1);
      } else if (!forward && wordEnd) {
        // ge
        if (!shortCircuit && (firstWord.to != curStart.ch || firstWord.line != curStart.line)) {
          // We did not start in the middle of a word. Discard the extra word at the end.
          lastWord = words.pop();
        }
        return new Pos(lastWord.line, lastWord.to);
      } else {
        // b
        return new Pos(lastWord.line, lastWord.from);
      }
    }

    function moveToEol(cm, head, motionArgs, vim, keepHPos) {
      var cur = head;
      var retval= new Pos(cur.line + motionArgs.repeat - 1, Infinity);
      var end=cm.clipPos(retval);
      end.ch--;
      if (!keepHPos) {
        vim.lastHPos = Infinity;
        vim.lastHSPos = cm.charCoords(end,'div').left;
      }
      return retval;
    }

    function moveToCharacter(cm, repeat, forward, character, head) {
      var cur = head || cm.getCursor();
      var start = cur.ch;
      var idx;
      for (var i = 0; i < repeat; i ++) {
        var line = cm.getLine(cur.line);
        idx = charIdxInLine(start, line, character, forward, true);
        if (idx == -1) {
          return null;
        }
        start = idx;
      }
      return new Pos(cm.getCursor().line, idx);
    }

    function moveToColumn(cm, repeat) {
      // repeat is always >= 1, so repeat - 1 always corresponds
      // to the column we want to go to.
      var line = cm.getCursor().line;
      return clipCursorToContent(cm, new Pos(line, repeat - 1));
    }

    function updateMark(cm, vim, markName, pos) {
      if (!inArray(markName, validMarks) && !latinCharRegex.test(markName)) {
        return;
      }
      if (vim.marks[markName]) {
        vim.marks[markName].clear();
      }
      vim.marks[markName] = cm.setBookmark(pos);
    }

    function charIdxInLine(start, line, character, forward, includeChar) {
      // Search for char in line.
      // motion_options: {forward, includeChar}
      // If includeChar = true, include it too.
      // If forward = true, search forward, else search backwards.
      // If char is not found on this line, do nothing
      var idx;
      if (forward) {
        idx = line.indexOf(character, start + 1);
        if (idx != -1 && !includeChar) {
          idx -= 1;
        }
      } else {
        idx = line.lastIndexOf(character, start - 1);
        if (idx != -1 && !includeChar) {
          idx += 1;
        }
      }
      return idx;
    }

    function findParagraph(cm, head, repeat, dir, inclusive) {
      var line = head.line;
      var min = cm.firstLine();
      var max = cm.lastLine();
      var start, end, i = line;
      function isEmpty(i) { return !/\S/.test(cm.getLine(i)); } // ace_patch
      function isBoundary(i, dir, any) {
        if (any) { return isEmpty(i) != isEmpty(i + dir); }
        return !isEmpty(i) && isEmpty(i + dir);
      }
      function skipFold(i) {
          dir = dir > 0 ? 1 : -1;
          var foldLine = cm.ace.session.getFoldLine(i);
          if (foldLine) {
              if (i + dir > foldLine.start.row && i + dir < foldLine.end.row)
                  dir = (dir > 0 ? foldLine.end.row : foldLine.start.row) - i;
          }
      }
      if (dir) {
        while (min <= i && i <= max && repeat > 0) {
          skipFold(i);
          if (isBoundary(i, dir)) { repeat--; }
          i += dir;
        }
        return new Pos(i, 0);
      }

      var vim = cm.state.vim;
      if (vim.visualLine && isBoundary(line, 1, true)) {
        var anchor = vim.sel.anchor;
        if (isBoundary(anchor.line, -1, true)) {
          if (!inclusive || anchor.line != line) {
            line += 1;
          }
        }
      }
      var startState = isEmpty(line);
      for (i = line; i <= max && repeat; i++) {
        if (isBoundary(i, 1, true)) {
          if (!inclusive || isEmpty(i) != startState) {
            repeat--;
          }
        }
      }
      end = new Pos(i, 0);
      // select boundary before paragraph for the last one
      if (i > max && !startState) { startState = true; }
      else { inclusive = false; }
      for (i = line; i > min; i--) {
        if (!inclusive || isEmpty(i) == startState || i == line) {
          if (isBoundary(i, -1, true)) { break; }
        }
      }
      start = new Pos(i, 0);
      return { start: start, end: end };
    }

    /**
     * Based on {@link findSentence}. The internal functions have the same names,
     * but their behaviour is different. findSentence() crosses line breaks and 
     * is used for jumping to sentence beginnings before or after the current cursor position, 
     * whereas getSentence() is for getting the beginning or end of the sentence 
     * at the current cursor position, either including (a) or excluding (i) whitespace.
     */
    function getSentence(cm, cur, repeat, dir, inclusive /*includes whitespace*/) {

      /*
        Takes an index object
        {
          line: the line string,
          ln: line number,
          pos: index in line,
          dir: direction of traversal (-1 or 1)
        }
        and modifies the pos member to represent the
        next valid position or sets the line to null if there are
        no more valid positions.
       */
      function nextChar(curr) {
        if (curr.pos + curr.dir < 0 || curr.pos + curr.dir >= curr.line.length) {
          curr.line = null;
        }
        else {
          curr.pos += curr.dir;
        }
      }
      /*
        Performs one iteration of traversal in forward direction
        Returns an index object of the sentence end
       */
      function forward(cm, ln, pos, dir) {
        var line = cm.getLine(ln);

        var curr = {
          line: line,
          ln: ln,
          pos: pos,
          dir: dir,
        };

        if (curr.line === "") {
          return { ln: curr.ln, pos: curr.pos };
        }

        var lastSentencePos = curr.pos;

        // Move one step to skip character we start on
        nextChar(curr);

        while (curr.line !== null) {
          lastSentencePos = curr.pos;
          if (isEndOfSentenceSymbol(curr.line[curr.pos])) {
            if (!inclusive) {
              return { ln: curr.ln, pos: curr.pos + 1 };
            } 
            else {
              nextChar(curr);
              while (curr.line !== null ) {
                if (isWhiteSpaceString(curr.line[curr.pos])) {
                  lastSentencePos = curr.pos;
                  nextChar(curr)
                } 
                else {
                  break;
                }
              }
              return { ln: curr.ln, pos: lastSentencePos + 1 };
            }
          }
          nextChar(curr);
        }
        return { ln: curr.ln, pos: lastSentencePos + 1 };
      }

      /*
        Performs one iteration of traversal in reverse direction
        Returns an index object of the sentence start
       */
      function reverse(cm, ln, pos, dir) {
        var line = cm.getLine(ln);

        var curr = {
          line: line,
          ln: ln,
          pos: pos,
          dir: dir,
        }

        if (curr.line === "") {
          return { ln: curr.ln, pos: curr.pos };
        }

        var lastSentencePos = curr.pos;

        // Move one step to skip character we start on
        nextChar(curr);

        while (curr.line !== null) {
          if (!isWhiteSpaceString(curr.line[curr.pos]) && !isEndOfSentenceSymbol(curr.line[curr.pos])) {
            lastSentencePos = curr.pos;
          }

          else if (isEndOfSentenceSymbol(curr.line[curr.pos]) ) {
            if (!inclusive) {
              return { ln: curr.ln, pos: lastSentencePos };
            } 
            else {
              if (isWhiteSpaceString(curr.line[curr.pos + 1])) {
                return { ln: curr.ln, pos: curr.pos + 1 };
              } 
              else {
                return { ln: curr.ln, pos: lastSentencePos };
              }
            }
          }

          nextChar(curr);
        }
        curr.line = line
        if (inclusive && isWhiteSpaceString(curr.line[curr.pos])) {
          return { ln: curr.ln, pos: curr.pos };
        } 
        else {
          return { ln: curr.ln, pos: lastSentencePos };
        }

      }

      var curr_index = {
        ln: cur.line,
        pos: cur.ch,
      };

      while (repeat > 0) {
        if (dir < 0) {
          curr_index = reverse(cm, curr_index.ln, curr_index.pos, dir);
        }
        else {
          curr_index = forward(cm, curr_index.ln, curr_index.pos, dir);
        }
        repeat--;
      }

      return new Pos(curr_index.ln, curr_index.pos);
    }

    function findSentence(cm, cur, repeat, dir) {

       /*
         Takes an index object
         {
           line: the line string,
           ln: line number,
           pos: index in line,
           dir: direction of traversal (-1 or 1)
         }
         and modifies the line, ln, and pos members to represent the
         next valid position or sets them to null if there are
         no more valid positions.
       */
      function nextChar(cm, idx) {
        if (idx.pos + idx.dir < 0 || idx.pos + idx.dir >= idx.line.length) {
          idx.ln += idx.dir;
          if (!isLine(cm, idx.ln)) {
            idx.line = null;
            idx.ln = null;
            idx.pos = null;
            return;
          }
          idx.line = cm.getLine(idx.ln);
          idx.pos = (idx.dir > 0) ? 0 : idx.line.length - 1;
        }
        else {
          idx.pos += idx.dir;
        }
      }

      /*
        Performs one iteration of traversal in forward direction
        Returns an index object of the new location
       */
      function forward(cm, ln, pos, dir) {
        var line = cm.getLine(ln);
        var stop = (line === "");

        var curr = {
          line: line,
          ln: ln,
          pos: pos,
          dir: dir,
        }

        var last_valid = {
          ln: curr.ln,
          pos: curr.pos,
        }

        var skip_empty_lines = (curr.line === "");

        // Move one step to skip character we start on
        nextChar(cm, curr);

        while (curr.line !== null) {
          last_valid.ln = curr.ln;
          last_valid.pos = curr.pos;

          if (curr.line === "" && !skip_empty_lines) {
            return { ln: curr.ln, pos: curr.pos, };
          }
          else if (stop && curr.line !== "" && !isWhiteSpaceString(curr.line[curr.pos])) {
            return { ln: curr.ln, pos: curr.pos, };
          }
          else if (isEndOfSentenceSymbol(curr.line[curr.pos])
            && !stop
            && (curr.pos === curr.line.length - 1
              || isWhiteSpaceString(curr.line[curr.pos + 1]))) {
            stop = true;
          }

          nextChar(cm, curr);
        }

        /*
          Set the position to the last non whitespace character on the last
          valid line in the case that we reach the end of the document.
        */
        var line = cm.getLine(last_valid.ln);
        last_valid.pos = 0;
        for(var i = line.length - 1; i >= 0; --i) {
          if (!isWhiteSpaceString(line[i])) {
            last_valid.pos = i;
            break;
          }
        }

        return last_valid;

      }

      /*
        Performs one iteration of traversal in reverse direction
        Returns an index object of the new location
       */
      function reverse(cm, ln, pos, dir) {
        var line = cm.getLine(ln);

        var curr = {
          line: line,
          ln: ln,
          pos: pos,
          dir: dir,
        }

        var last_valid = {
          ln: curr.ln,
          pos: null,
        };

        var skip_empty_lines = (curr.line === "");

        // Move one step to skip character we start on
        nextChar(cm, curr);

        while (curr.line !== null) {

          if (curr.line === "" && !skip_empty_lines) {
            if (last_valid.pos !== null) {
              return last_valid;
            }
            else {
              return { ln: curr.ln, pos: curr.pos };
            }
          }
          else if (isEndOfSentenceSymbol(curr.line[curr.pos])
              && last_valid.pos !== null
              && !(curr.ln === last_valid.ln && curr.pos + 1 === last_valid.pos)) {
            return last_valid;
          }
          else if (curr.line !== "" && !isWhiteSpaceString(curr.line[curr.pos])) {
            skip_empty_lines = false;
            last_valid = { ln: curr.ln, pos: curr.pos }
          }

          nextChar(cm, curr);
        }

        /*
          Set the position to the first non whitespace character on the last
          valid line in the case that we reach the beginning of the document.
        */
        var line = cm.getLine(last_valid.ln);
        last_valid.pos = 0;
        for(var i = 0; i < line.length; ++i) {
          if (!isWhiteSpaceString(line[i])) {
            last_valid.pos = i;
            break;
          }
        }
        return last_valid;
      }

      var curr_index = {
        ln: cur.line,
        pos: cur.ch,
      };

      while (repeat > 0) {
        if (dir < 0) {
          curr_index = reverse(cm, curr_index.ln, curr_index.pos, dir);
        }
        else {
          curr_index = forward(cm, curr_index.ln, curr_index.pos, dir);
        }
        repeat--;
      }

      return new Pos(curr_index.ln, curr_index.pos);
    }

    // TODO: perhaps this finagling of start and end positions belongs
    // in codemirror/replaceRange?
    function selectCompanionObject(cm, head, symb, inclusive) {
      var cur = head, start, end;

      var bracketRegexp = ({
        '(': /[()]/, ')': /[()]/,
        '[': /[[\]]/, ']': /[[\]]/,
        '{': /[{}]/, '}': /[{}]/,
        '<': /[<>]/, '>': /[<>]/})[symb];
      var openSym = ({
        '(': '(', ')': '(',
        '[': '[', ']': '[',
        '{': '{', '}': '{',
        '<': '<', '>': '<'})[symb];
      var curChar = cm.getLine(cur.line).charAt(cur.ch);
      // Due to the behavior of scanForBracket, we need to add an offset if the
      // cursor is on a matching open bracket.
      var offset = curChar === openSym ? 1 : 0;

      start = cm.scanForBracket(new Pos(cur.line, cur.ch + offset), -1, undefined, {'bracketRegex': bracketRegexp});
      end = cm.scanForBracket(new Pos(cur.line, cur.ch + offset), 1, undefined, {'bracketRegex': bracketRegexp});

      if (!start || !end) return null;

      start = start.pos;
      end = end.pos;

      if ((start.line == end.line && start.ch > end.ch)
          || (start.line > end.line)) {
        var tmp = start;
        start = end;
        end = tmp;
      }

      if (inclusive) {
        end.ch += 1;
      } else {
        start.ch += 1;
      }

      return { start: start, end: end };
    }

    // Takes in a symbol and a cursor and tries to simulate text objects that
    // have identical opening and closing symbols
    // TODO support across multiple lines
    function findBeginningAndEnd(cm, head, symb, inclusive) {
      var cur = copyCursor(head);
      var line = cm.getLine(cur.line);
      var chars = line.split('');
      var start, end, i, len;
      var firstIndex = chars.indexOf(symb);

      // the decision tree is to always look backwards for the beginning first,
      // but if the cursor is in front of the first instance of the symb,
      // then move the cursor forward
      if (cur.ch < firstIndex) {
        cur.ch = firstIndex;
      }
      // otherwise if the cursor is currently on the closing symbol
      else if (firstIndex < cur.ch && chars[cur.ch] == symb) {
        var stringAfter = /string/.test(cm.getTokenTypeAt(offsetCursor(head, 0, 1)));
        var stringBefore = /string/.test(cm.getTokenTypeAt(head));
        var isStringStart = stringAfter && !stringBefore
        if (!isStringStart) {
          end = cur.ch; // assign end to the current cursor
          --cur.ch; // make sure to look backwards
        }
      }

      // if we're currently on the symbol, we've got a start
      if (chars[cur.ch] == symb && !end) {
        start = cur.ch + 1; // assign start to ahead of the cursor
      } else {
        // go backwards to find the start
        for (i = cur.ch; i > -1 && !start; i--) {
          if (chars[i] == symb) {
            start = i + 1;
          }
        }
      }

      // look forwards for the end symbol
      if (start && !end) {
        for (i = start, len = chars.length; i < len && !end; i++) {
          if (chars[i] == symb) {
            end = i;
          }
        }
      }

      // nothing found
      if (!start || !end) {
        return { start: cur, end: cur };
      }

      // include the symbols
      if (inclusive) {
        --start; ++end;
      }

      return {
        start: new Pos(cur.line, start),
        end: new Pos(cur.line, end)
      };
    }

    // Search functions
    defineOption('pcre', true, 'boolean');
    function SearchState() {}
    SearchState.prototype = {
      getQuery: function() {
        return vimGlobalState.query;
      },
      setQuery: function(query) {
        vimGlobalState.query = query;
      },
      getOverlay: function() {
        return this.searchOverlay;
      },
      setOverlay: function(overlay) {
        this.searchOverlay = overlay;
      },
      isReversed: function() {
        return vimGlobalState.isReversed;
      },
      setReversed: function(reversed) {
        vimGlobalState.isReversed = reversed;
      },
      getScrollbarAnnotate: function() {
        return this.annotate;
      },
      setScrollbarAnnotate: function(annotate) {
        this.annotate = annotate;
      }
    };
    function getSearchState(cm) {
      var vim = cm.state.vim;
      return vim.searchState_ || (vim.searchState_ = new SearchState());
    }
    function splitBySlash(argString) {
      return splitBySeparator(argString, '/');
    }

    function findUnescapedSlashes(argString) {
      return findUnescapedSeparators(argString, '/');
    }

    function splitBySeparator(argString, separator) {
      var slashes = findUnescapedSeparators(argString, separator) || [];
      if (!slashes.length) return [];
      var tokens = [];
      // in case of strings like foo/bar
      if (slashes[0] !== 0) return;
      for (var i = 0; i < slashes.length; i++) {
        if (typeof slashes[i] == 'number')
          tokens.push(argString.substring(slashes[i] + 1, slashes[i+1]));
      }
      return tokens;
    }

    function findUnescapedSeparators(str, separator) {
      if (!separator)
        separator = '/';

      var escapeNextChar = false;
      var slashes = [];
      for (var i = 0; i < str.length; i++) {
        var c = str.charAt(i);
        if (!escapeNextChar && c == separator) {
          slashes.push(i);
        }
        escapeNextChar = !escapeNextChar && (c == '\\');
      }
      return slashes;
    }

    // Translates a search string from ex (vim) syntax into javascript form.
    function translateRegex(str) {
      // When these match, add a '\' if unescaped or remove one if escaped.
      var specials = '|(){';
      // Remove, but never add, a '\' for these.
      var unescape = '}';
      var escapeNextChar = false;
      var out = [];
      for (var i = -1; i < str.length; i++) {
        var c = str.charAt(i) || '';
        var n = str.charAt(i+1) || '';
        var specialComesNext = (n && specials.indexOf(n) != -1);
        if (escapeNextChar) {
          if (c !== '\\' || !specialComesNext) {
            out.push(c);
          }
          escapeNextChar = false;
        } else {
          if (c === '\\') {
            escapeNextChar = true;
            // Treat the unescape list as special for removing, but not adding '\'.
            if (n && unescape.indexOf(n) != -1) {
              specialComesNext = true;
            }
            // Not passing this test means removing a '\'.
            if (!specialComesNext || n === '\\') {
              out.push(c);
            }
          } else {
            out.push(c);
            if (specialComesNext && n !== '\\') {
              out.push('\\');
            }
          }
        }
      }
      return out.join('');
    }

    // Translates the replace part of a search and replace from ex (vim) syntax into
    // javascript form.  Similar to translateRegex, but additionally fixes back references
    // (translates '\[0..9]' to '$[0..9]') and follows different rules for escaping '$'.
    var charUnescapes = {'\\n': '\n', '\\r': '\r', '\\t': '\t'};
    function translateRegexReplace(str) {
      var escapeNextChar = false;
      var out = [];
      for (var i = -1; i < str.length; i++) {
        var c = str.charAt(i) || '';
        var n = str.charAt(i+1) || '';
        if (charUnescapes[c + n]) {
          out.push(charUnescapes[c+n]);
          i++;
        } else if (escapeNextChar) {
          // At any point in the loop, escapeNextChar is true if the previous
          // character was a '\' and was not escaped.
          out.push(c);
          escapeNextChar = false;
        } else {
          if (c === '\\') {
            escapeNextChar = true;
            if ((isNumber(n) || n === '$')) {
              out.push('$');
            } else if (n !== '/' && n !== '\\') {
              out.push('\\');
            }
          } else {
            if (c === '$') {
              out.push('$');
            }
            out.push(c);
            if (n === '/') {
              out.push('\\');
            }
          }
        }
      }
      return out.join('');
    }

    // Unescape \ and / in the replace part, for PCRE mode.
    var unescapes = {'\\/': '/', '\\\\': '\\', '\\n': '\n', '\\r': '\r', '\\t': '\t', '\\&':'&'};
    function unescapeRegexReplace(str) {
      var stream = new CodeMirror.StringStream(str);
      var output = [];
      while (!stream.eol()) {
        // Search for \.
        while (stream.peek() && stream.peek() != '\\') {
          output.push(stream.next());
        }
        var matched = false;
        for (var matcher in unescapes) {
          if (stream.match(matcher, true)) {
            matched = true;
            output.push(unescapes[matcher]);
            break;
          }
        }
        if (!matched) {
          // Don't change anything
          output.push(stream.next());
        }
      }
      return output.join('');
    }

    /**
     * Extract the regular expression from the query and return a Regexp object.
     * Returns null if the query is blank.
     * If ignoreCase is passed in, the Regexp object will have the 'i' flag set.
     * If smartCase is passed in, and the query contains upper case letters,
     *   then ignoreCase is overridden, and the 'i' flag will not be set.
     * If the query contains the /i in the flag part of the regular expression,
     *   then both ignoreCase and smartCase are ignored, and 'i' will be passed
     *   through to the Regex object.
     */
    function parseQuery(query, ignoreCase, smartCase) {
      // First update the last search register
      var lastSearchRegister = vimGlobalState.registerController.getRegister('/');
      lastSearchRegister.setText(query);
      // Check if the query is already a regex.
      if (query instanceof RegExp) { return query; }
      // First try to extract regex + flags from the input. If no flags found,
      // extract just the regex. IE does not accept flags directly defined in
      // the regex string in the form /regex/flags
      var slashes = findUnescapedSlashes(query);
      var regexPart;
      var forceIgnoreCase;
      if (!slashes.length) {
        // Query looks like 'regexp'
        regexPart = query;
      } else {
        // Query looks like 'regexp/...'
        regexPart = query.substring(0, slashes[0]);
        var flagsPart = query.substring(slashes[0]);
        forceIgnoreCase = (flagsPart.indexOf('i') != -1);
      }
      if (!regexPart) {
        return null;
      }
      if (!getOption('pcre')) {
        regexPart = translateRegex(regexPart);
      }
      if (smartCase) {
        ignoreCase = (/^[^A-Z]*$/).test(regexPart);
      }
      var regexp = new RegExp(regexPart,
          (ignoreCase || forceIgnoreCase) ? 'im' : 'm');
      return regexp;
    }

    /**
     * dom - Document Object Manipulator
     * Usage:
     *   dom('<tag>'|<node>[, ...{<attributes>|<$styles>}|<child-node>|'<text>'])
     * Examples:
     *   dom('div', {id:'xyz'}, dom('p', 'CM rocks!', {$color:'red'}))
     *   dom(document.head, dom('script', 'alert("hello!")'))
     * Not supported:
     *   dom('p', ['arrays are objects'], Error('objects specify attributes'))
     */
    function dom(n) {
      if (typeof n === 'string') n = document.createElement(n);
      for (var a, i = 1; i < arguments.length; i++) {
        if (!(a = arguments[i])) continue;
        if (typeof a !== 'object') a = document.createTextNode(a);
        if (a.nodeType) n.appendChild(a);
        else for (var key in a) {
          if (!Object.prototype.hasOwnProperty.call(a, key)) continue;
          if (key[0] === '$') n.style[key.slice(1)] = a[key];
          else n.setAttribute(key, a[key]);
        }
      }
      return n;
    }

    function showConfirm(cm, template) {
      var pre = dom('div', {$color: 'red', $whiteSpace: 'pre', class: 'cm-vim-message'}, template);
      if (cm.openNotification) {
        cm.openNotification(pre, {bottom: true, duration: 5000});
      } else {
        alert(pre.innerText);
      }
    }

    function makePrompt(prefix, desc) {
      return dom('div', {$display: 'flex'},
               dom('span', {$fontFamily: 'monospace', $whiteSpace: 'pre', $flex: 1},
                 prefix,
                 dom('input', {type: 'text', autocorrect: 'off',
                               autocapitalize: 'off', spellcheck: 'false', $width: '100%'})),
               desc && dom('span', {$color: '#888'}, desc));
    }

    function showPrompt(cm, options) {
      if (keyToKeyStack.length) {
        if (!options.value) options.value = '';
        virtualPrompt = options;
        return;
      }
      var template = makePrompt(options.prefix, options.desc);
      if (cm.openDialog) {
        cm.openDialog(template, options.onClose, {
          onKeyDown: options.onKeyDown, onKeyUp: options.onKeyUp,
          bottom: true, selectValueOnOpen: false, value: options.value
        });
      }
      else {
        var shortText = '';
        if (typeof options.prefix != "string" && options.prefix) shortText += options.prefix.textContent;
        if (options.desc) shortText += " " + options.desc;
        options.onClose(prompt(shortText, ''));
      }
    }

    function regexEqual(r1, r2) {
      if (r1 instanceof RegExp && r2 instanceof RegExp) {
          var props = ['global', 'multiline', 'ignoreCase', 'source'];
          for (var i = 0; i < props.length; i++) {
              var prop = props[i];
              if (r1[prop] !== r2[prop]) {
                  return false;
              }
          }
          return true;
      }
      return false;
    }
    // Returns true if the query is valid.
    function updateSearchQuery(cm, rawQuery, ignoreCase, smartCase) {
      if (!rawQuery) {
        return;
      }
      var state = getSearchState(cm);
      var query = parseQuery(rawQuery, !!ignoreCase, !!smartCase);
      if (!query) {
        return;
      }
      highlightSearchMatches(cm, query);
      if (regexEqual(query, state.getQuery())) {
        return query;
      }
      state.setQuery(query);
      return query;
    }
    function searchOverlay(query) {
      if (query.source.charAt(0) == '^') {
        var matchSol = true;
      }
      return {
        token: function(stream) {
          if (matchSol && !stream.sol()) {
            stream.skipToEnd();
            return;
          }
          var match = stream.match(query, false);
          if (match) {
            if (match[0].length == 0) {
              // Matched empty string, skip to next.
              stream.next();
              return 'searching';
            }
            if (!stream.sol()) {
              // Backtrack 1 to match \b
              stream.backUp(1);
              if (!query.exec(stream.next() + match[0])) {
                stream.next();
                return null;
              }
            }
            stream.match(query);
            return 'searching';
          }
          while (!stream.eol()) {
            stream.next();
            if (stream.match(query, false)) break;
          }
        },
        query: query
      };
    }
    var highlightTimeout = 0;
    function highlightSearchMatches(cm, query) {
      clearTimeout(highlightTimeout);
      var searchState = getSearchState(cm);
      searchState.highlightTimeout = highlightTimeout;
      highlightTimeout = setTimeout(function() {
        if (!cm.state.vim) return;
        var searchState = getSearchState(cm);
        searchState.highlightTimeout = null;
        var overlay = searchState.getOverlay();
        if (!overlay || query != overlay.query) {
          if (overlay) {
            cm.removeOverlay(overlay);
          }
          overlay = searchOverlay(query);
          cm.addOverlay(overlay);
          if (cm.showMatchesOnScrollbar) {
            if (searchState.getScrollbarAnnotate()) {
              searchState.getScrollbarAnnotate().clear();
            }
            searchState.setScrollbarAnnotate(cm.showMatchesOnScrollbar(query));
          }
          searchState.setOverlay(overlay);
        }
      }, 50);
    }
    function findNext(cm, prev, query, repeat) {
      if (repeat === undefined) { repeat = 1; }
      return cm.operation(function() {
        var pos = cm.getCursor();
        var cursor = cm.getSearchCursor(query, pos);
        for (var i = 0; i < repeat; i++) {
          var found = cursor.find(prev);
          if (i == 0 && found && cursorEqual(cursor.from(), pos)) {
            var lastEndPos = prev ? cursor.from() : cursor.to();
            found = cursor.find(prev);
            if (found && !found[0] && cursorEqual(cursor.from(), lastEndPos)) {
              if (cm.getLine(lastEndPos.line).length == lastEndPos.ch)
                found = cursor.find(prev);
            }
          }
          if (!found) {
            // SearchCursor may have returned null because it hit EOF, wrap
            // around and try again.
            cursor = cm.getSearchCursor(query,
                (prev) ? new Pos(cm.lastLine()) : new Pos(cm.firstLine(), 0) );
            if (!cursor.find(prev)) {
              return;
            }
          }
        }
        return cursor.from();
      });
    }
    /**
     * Pretty much the same as `findNext`, except for the following differences:
     *
     * 1. Before starting the search, move to the previous search. This way if our cursor is
     * already inside a match, we should return the current match.
     * 2. Rather than only returning the cursor's from, we return the cursor's from and to as a tuple.
     */
    function findNextFromAndToInclusive(cm, prev, query, repeat, vim) {
      if (repeat === undefined) { repeat = 1; }
      return cm.operation(function() {
        var pos = cm.getCursor();
        var cursor = cm.getSearchCursor(query, pos);

        // Go back one result to ensure that if the cursor is currently a match, we keep it.
        var found = cursor.find(!prev);

        // If we haven't moved, go back one more (similar to if i==0 logic in findNext).
        if (!vim.visualMode && found && cursorEqual(cursor.from(), pos)) {
          cursor.find(!prev);
        }

        for (var i = 0; i < repeat; i++) {
          found = cursor.find(prev);
          if (!found) {
            // SearchCursor may have returned null because it hit EOF, wrap
            // around and try again.
            cursor = cm.getSearchCursor(query,
                (prev) ? new Pos(cm.lastLine()) : new Pos(cm.firstLine(), 0) );
            if (!cursor.find(prev)) {
              return;
            }
          }
        }
        return [cursor.from(), cursor.to()];
      });
    }
    function clearSearchHighlight(cm) {
      var state = getSearchState(cm);
      if (state.highlightTimeout) {
        clearTimeout(state.highlightTimeout);
        state.highlightTimeout = null;
      }
      cm.removeOverlay(getSearchState(cm).getOverlay());
      state.setOverlay(null);
      if (state.getScrollbarAnnotate()) {
        state.getScrollbarAnnotate().clear();
        state.setScrollbarAnnotate(null);
      }
    }
    /**
     * Check if pos is in the specified range, INCLUSIVE.
     * Range can be specified with 1 or 2 arguments.
     * If the first range argument is an array, treat it as an array of line
     * numbers. Match pos against any of the lines.
     * If the first range argument is a number,
     *   if there is only 1 range argument, check if pos has the same line
     *       number
     *   if there are 2 range arguments, then check if pos is in between the two
     *       range arguments.
     */
    function isInRange(pos, start, end) {
      if (typeof pos != 'number') {
        // Assume it is a cursor position. Get the line number.
        pos = pos.line;
      }
      if (start instanceof Array) {
        return inArray(pos, start);
      } else {
        if (typeof end == 'number') {
          return (pos >= start && pos <= end);
        } else {
          return pos == start;
        }
      }
    }
    function getUserVisibleLines(cm) {
      // ace_patch{
      var renderer = cm.ace.renderer;
      return {
        top: renderer.getFirstFullyVisibleRow(),
        bottom: renderer.getLastFullyVisibleRow()
      }
      // ace_patch}
    }

    function getMarkPos(cm, vim, markName) {
      if (markName == '\'' || markName == '`') {
        return vimGlobalState.jumpList.find(cm, -1) || new Pos(0, 0);
      } else if (markName == '.') {
        return getLastEditPos(cm);
      }

      var mark = vim.marks[markName];
      return mark && mark.find();
    }

    function getLastEditPos(cm) {
      if (cm.getLastEditEnd) {
        return cm.getLastEditEnd();
      }
      // for old cm
      var done = cm.doc.history.done;
      for (var i = done.length; i--;) {
        if (done[i].changes) {
          return copyCursor(done[i].changes[0].to);
        }
      }
    }

    var ExCommandDispatcher = function() {
      this.buildCommandMap_();
    };
    ExCommandDispatcher.prototype = {
      processCommand: function(cm, input, opt_params) {
        var that = this;
        cm.operation(function () {
          cm.curOp.isVimOp = true;
          that._processCommand(cm, input, opt_params);
        });
      },
      _processCommand: function(cm, input, opt_params) {
        var vim = cm.state.vim;
        var commandHistoryRegister = vimGlobalState.registerController.getRegister(':');
        var previousCommand = commandHistoryRegister.toString();
        var inputStream = new CodeMirror.StringStream(input);
        // update ": with the latest command whether valid or invalid
        commandHistoryRegister.setText(input);
        var params = opt_params || {};
        params.input = input;
        try {
          this.parseInput_(cm, inputStream, params);
        } catch(e) {
          showConfirm(cm, e.toString());
          throw e;
        }

        if (vim.visualMode) {
          exitVisualMode(cm);
        }

        var command;
        var commandName;
        if (!params.commandName) {
          // If only a line range is defined, move to the line.
          if (params.line !== undefined) {
            commandName = 'move';
          }
        } else {
          command = this.matchCommand_(params.commandName);
          if (command) {
            commandName = command.name;
            if (command.excludeFromCommandHistory) {
              commandHistoryRegister.setText(previousCommand);
            }
            this.parseCommandArgs_(inputStream, params, command);
            if (command.type == 'exToKey') {
              // Handle Ex to Key mapping.
              doKeyToKey(cm, command.toKeys, command);
              return;
            } else if (command.type == 'exToEx') {
              // Handle Ex to Ex mapping.
              this.processCommand(cm, command.toInput);
              return;
            }
          }
        }
        if (!commandName) {
          showConfirm(cm, 'Not an editor command ":' + input + '"');
          return;
        }
        try {
          exCommands[commandName](cm, params);
          // Possibly asynchronous commands (e.g. substitute, which might have a
          // user confirmation), are responsible for calling the callback when
          // done. All others have it taken care of for them here.
          if ((!command || !command.possiblyAsync) && params.callback) {
            params.callback();
          }
        } catch(e) {
          showConfirm(cm, e.toString());
          throw e;
        }
      },
      parseInput_: function(cm, inputStream, result) {
        inputStream.eatWhile(':');
        // Parse range.
        if (inputStream.eat('%')) {
          result.line = cm.firstLine();
          result.lineEnd = cm.lastLine();
        } else {
          result.line = this.parseLineSpec_(cm, inputStream);
          if (result.line !== undefined && inputStream.eat(',')) {
            result.lineEnd = this.parseLineSpec_(cm, inputStream);
          }
        }

        if (result.line == undefined) {
          if (cm.state.vim.visualMode) {
            var pos = getMarkPos(cm, cm.state.vim, '<');
            result.selectionLine = pos && pos.line;
            pos = getMarkPos(cm, cm.state.vim, '>');
            result.selectionLineEnd = pos && pos.line;
          } else {
            result.selectionLine = cm.getCursor().line;
          }
        } else {
          result.selectionLine = result.line;
          result.selectionLineEnd = result.lineEnd;
        }

        // Parse command name.
        var commandMatch = inputStream.match(/^(\w+|!!|@@|[!#&*<=>@~])/);
        if (commandMatch) {
          result.commandName = commandMatch[1];
        } else {
          result.commandName = inputStream.match(/.*/)[0];
        }

        return result;
      },
      parseLineSpec_: function(cm, inputStream) {
        var numberMatch = inputStream.match(/^(\d+)/);
        if (numberMatch) {
          // Absolute line number plus offset (N+M or N-M) is probably a typo,
          // not something the user actually wanted. (NB: vim does allow this.)
          return parseInt(numberMatch[1], 10) - 1;
        }
        switch (inputStream.next()) {
          case '.':
            return this.parseLineSpecOffset_(inputStream, cm.getCursor().line);
          case '$':
            return this.parseLineSpecOffset_(inputStream, cm.lastLine());
          case '\'':
            var markName = inputStream.next();
            var markPos = getMarkPos(cm, cm.state.vim, markName);
            if (!markPos) throw new Error('Mark not set');
            return this.parseLineSpecOffset_(inputStream, markPos.line);
          case '-':
          case '+':
            inputStream.backUp(1);
            // Offset is relative to current line if not otherwise specified.
            return this.parseLineSpecOffset_(inputStream, cm.getCursor().line);
          default:
            inputStream.backUp(1);
            return undefined;
        }
      },
      parseLineSpecOffset_: function(inputStream, line) {
        var offsetMatch = inputStream.match(/^([+-])?(\d+)/);
        if (offsetMatch) {
          var offset = parseInt(offsetMatch[2], 10);
          if (offsetMatch[1] == "-") {
            line -= offset;
          } else {
            line += offset;
          }
        }
        return line;
      },
      parseCommandArgs_: function(inputStream, params, command) {
        if (inputStream.eol()) {
          return;
        }
        params.argString = inputStream.match(/.*/)[0];
        // Parse command-line arguments
        var delim = command.argDelimiter || /\s+/;
        var args = trim(params.argString).split(delim);
        if (args.length && args[0]) {
          params.args = args;
        }
      },
      matchCommand_: function(commandName) {
        // Return the command in the command map that matches the shortest
        // prefix of the passed in command name. The match is guaranteed to be
        // unambiguous if the defaultExCommandMap's shortNames are set up
        // correctly. (see @code{defaultExCommandMap}).
        for (var i = commandName.length; i > 0; i--) {
          var prefix = commandName.substring(0, i);
          if (this.commandMap_[prefix]) {
            var command = this.commandMap_[prefix];
            if (command.name.indexOf(commandName) === 0) {
              return command;
            }
          }
        }
        return null;
      },
      buildCommandMap_: function() {
        this.commandMap_ = {};
        for (var i = 0; i < defaultExCommandMap.length; i++) {
          var command = defaultExCommandMap[i];
          var key = command.shortName || command.name;
          this.commandMap_[key] = command;
        }
      },
      map: function(lhs, rhs, ctx, noremap) {
        if (lhs != ':' && lhs.charAt(0) == ':') {
          if (ctx) { throw Error('Mode not supported for ex mappings'); }
          var commandName = lhs.substring(1);
          if (rhs != ':' && rhs.charAt(0) == ':') {
            // Ex to Ex mapping
            this.commandMap_[commandName] = {
              name: commandName,
              type: 'exToEx',
              toInput: rhs.substring(1),
              user: true
            };
          } else {
            // Ex to key mapping
            this.commandMap_[commandName] = {
              name: commandName,
              type: 'exToKey',
              toKeys: rhs,
              user: true
            };
          }
        } else {
          // Key to key or ex mapping
          var mapping = {
            keys: lhs,
            type: 'keyToKey',
            toKeys: rhs,
            noremap: !!noremap
          };
          if (ctx) { mapping.context = ctx; }
          defaultKeymap.unshift(mapping);
        }
      },
      unmap: function(lhs, ctx) {
        if (lhs != ':' && lhs.charAt(0) == ':') {
          // Ex to Ex or Ex to key mapping
          if (ctx) { throw Error('Mode not supported for ex mappings'); }
          var commandName = lhs.substring(1);
          if (this.commandMap_[commandName] && this.commandMap_[commandName].user) {
            delete this.commandMap_[commandName];
            return true;
          }
        } else {
          // Key to Ex or key to key mapping
          var keys = lhs;
          for (var i = 0; i < defaultKeymap.length; i++) {
            if (keys == defaultKeymap[i].keys
                && defaultKeymap[i].context === ctx) {
              defaultKeymap.splice(i, 1);
              return true;
            }
          }
        }
      }
    };

    var exCommands = {
      colorscheme: function(cm, params) {
        if (!params.args || params.args.length < 1) {
          showConfirm(cm, cm.getOption('theme'));
          return;
        }
        cm.setOption('theme', params.args[0]);
      },
      map: function(cm, params, ctx, defaultOnly) {
        var mapArgs = params.args;
        if (!mapArgs || mapArgs.length < 2) {
          if (cm) {
            showConfirm(cm, 'Invalid mapping: ' + params.input);
          }
          return;
        }
        exCommandDispatcher.map(mapArgs[0], mapArgs[1], ctx, defaultOnly);
      },
      imap: function(cm, params) { this.map(cm, params, 'insert'); },
      nmap: function(cm, params) { this.map(cm, params, 'normal'); },
      vmap: function(cm, params) { this.map(cm, params, 'visual'); },
      omap: function(cm, params) { this.map(cm, params, 'operatorPending'); },
      noremap: function(cm, params) { this.map(cm, params, undefined, true); },
      inoremap: function(cm, params) { this.map(cm, params, 'insert', true); },
      nnoremap: function(cm, params) { this.map(cm, params, 'normal', true); },
      vnoremap: function(cm, params) { this.map(cm, params, 'visual', true); },
      onoremap: function(cm, params) { this.map(cm, params, 'operatorPending', true); },
      unmap: function(cm, params, ctx) {
        var mapArgs = params.args;
        if (!mapArgs || mapArgs.length < 1 || !exCommandDispatcher.unmap(mapArgs[0], ctx)) {
          if (cm) {
            showConfirm(cm, 'No such mapping: ' + params.input);
          }
        }
      },
      mapclear: function(cm, params) { vimApi.mapclear(); },
      imapclear: function(cm, params) { vimApi.mapclear('insert'); },
      nmapclear: function(cm, params) { vimApi.mapclear('normal'); },
      vmapclear: function(cm, params) { vimApi.mapclear('visual'); },
      omapclear: function(cm, params) { vimApi.mapclear('operatorPending'); },
      move: function(cm, params) {
        commandDispatcher.processCommand(cm, cm.state.vim, {
            type: 'motion',
            motion: 'moveToLineOrEdgeOfDocument',
            motionArgs: { forward: false, explicitRepeat: true,
              linewise: true },
            repeatOverride: params.line+1});
      },
      set: function(cm, params) {
        var setArgs = params.args;
        // Options passed through to the setOption/getOption calls. May be passed in by the
        // local/global versions of the set command
        var setCfg = params.setCfg || {};
        if (!setArgs || setArgs.length < 1) {
          if (cm) {
            showConfirm(cm, 'Invalid mapping: ' + params.input);
          }
          return;
        }
        var expr = setArgs[0].split('=');
        var optionName = expr[0];
        var value = expr[1];
        var forceGet = false;
        var forceToggle = false;

        if (optionName.charAt(optionName.length - 1) == '?') {
          // If post-fixed with ?, then the set is actually a get.
          if (value) { throw Error('Trailing characters: ' + params.argString); }
          optionName = optionName.substring(0, optionName.length - 1);
          forceGet = true;
        } else if (optionName.charAt(optionName.length - 1) == '!') {
          optionName = optionName.substring(0, optionName.length - 1);
          forceToggle = true;
        }
        if (value === undefined && optionName.substring(0, 2) == 'no') {
          // To set boolean options to false, the option name is prefixed with
          // 'no'.
          optionName = optionName.substring(2);
          value = false;
        }

        var optionIsBoolean = options[optionName] && options[optionName].type == 'boolean';
        if (optionIsBoolean) {
          if (forceToggle) {
            value = !getOption(optionName, cm, setCfg);
          } else if (value == undefined) {
            // Calling set with a boolean option sets it to true.
            value = true;
          }
        }
        // If no value is provided, then we assume this is a get.
        if (!optionIsBoolean && value === undefined || forceGet) {
          var oldValue = getOption(optionName, cm, setCfg);
          if (oldValue instanceof Error) {
            showConfirm(cm, oldValue.message);
          } else if (oldValue === true || oldValue === false) {
            showConfirm(cm, ' ' + (oldValue ? '' : 'no') + optionName);
          } else {
            showConfirm(cm, '  ' + optionName + '=' + oldValue);
          }
        } else {
          var setOptionReturn = setOption(optionName, value, cm, setCfg);
          if (setOptionReturn instanceof Error) {
            showConfirm(cm, setOptionReturn.message);
          }
        }
      },
      setlocal: function (cm, params) {
        // setCfg is passed through to setOption
        params.setCfg = {scope: 'local'};
        this.set(cm, params);
      },
      setglobal: function (cm, params) {
        // setCfg is passed through to setOption
        params.setCfg = {scope: 'global'};
        this.set(cm, params);
      },
      registers: function(cm, params) {
        var regArgs = params.args;
        var registers = vimGlobalState.registerController.registers;
        var regInfo = '----------Registers----------\n\n';
        if (!regArgs) {
          for (var registerName in registers) {
            var text = registers[registerName].toString();
            if (text.length) {
              regInfo += '"' + registerName + '    ' + text + '\n'
            }
          }
        } else {
          var registerName;
          regArgs = regArgs.join('');
          for (var i = 0; i < regArgs.length; i++) {
            registerName = regArgs.charAt(i);
            if (!vimGlobalState.registerController.isValidRegister(registerName)) {
              continue;
            }
            var register = registers[registerName] || new Register();
            regInfo += '"' + registerName + '    ' + register.toString() + '\n'
          }
        }
        showConfirm(cm, regInfo);
      },
      sort: function(cm, params) {
        var reverse, ignoreCase, unique, number, pattern;
        function parseArgs() {
          if (params.argString) {
            var args = new CodeMirror.StringStream(params.argString);
            if (args.eat('!')) { reverse = true; }
            if (args.eol()) { return; }
            if (!args.eatSpace()) { return 'Invalid arguments'; }
            var opts = args.match(/([dinuox]+)?\s*(\/.+\/)?\s*/);
            if (!opts && !args.eol()) { return 'Invalid arguments'; }
            if (opts[1]) {
              ignoreCase = opts[1].indexOf('i') != -1;
              unique = opts[1].indexOf('u') != -1;
              var decimal = opts[1].indexOf('d') != -1 || opts[1].indexOf('n') != -1 && 1;
              var hex = opts[1].indexOf('x') != -1 && 1;
              var octal = opts[1].indexOf('o') != -1 && 1;
              if (decimal + hex + octal > 1) { return 'Invalid arguments'; }
              number = decimal && 'decimal' || hex && 'hex' || octal && 'octal';
            }
            if (opts[2]) {
              pattern = new RegExp(opts[2].substr(1, opts[2].length - 2), ignoreCase ? 'i' : '');
            }
          }
        }
        var err = parseArgs();
        if (err) {
          showConfirm(cm, err + ': ' + params.argString);
          return;
        }
        var lineStart = params.line || cm.firstLine();
        var lineEnd = params.lineEnd || params.line || cm.lastLine();
        if (lineStart == lineEnd) { return; }
        var curStart = new Pos(lineStart, 0);
        var curEnd = new Pos(lineEnd, lineLength(cm, lineEnd));
        var text = cm.getRange(curStart, curEnd).split('\n');
        var numberRegex = pattern ? pattern :
           (number == 'decimal') ? /(-?)([\d]+)/ :
           (number == 'hex') ? /(-?)(?:0x)?([0-9a-f]+)/i :
           (number == 'octal') ? /([0-7]+)/ : null;
        var radix = (number == 'decimal') ? 10 : (number == 'hex') ? 16 : (number == 'octal') ? 8 : null;
        var numPart = [], textPart = [];
        if (number || pattern) {
          for (var i = 0; i < text.length; i++) {
            var matchPart = pattern ? text[i].match(pattern) : null;
            if (matchPart && matchPart[0] != '') {
              numPart.push(matchPart);
            } else if (!pattern && numberRegex.exec(text[i])) {
              numPart.push(text[i]);
            } else {
              textPart.push(text[i]);
            }
          }
        } else {
          textPart = text;
        }
        function compareFn(a, b) {
          if (reverse) { var tmp; tmp = a; a = b; b = tmp; }
          if (ignoreCase) { a = a.toLowerCase(); b = b.toLowerCase(); }
          var anum = number && numberRegex.exec(a);
          var bnum = number && numberRegex.exec(b);
          if (!anum) { return a < b ? -1 : 1; }
          anum = parseInt((anum[1] + anum[2]).toLowerCase(), radix);
          bnum = parseInt((bnum[1] + bnum[2]).toLowerCase(), radix);
          return anum - bnum;
        }
        function comparePatternFn(a, b) {
          if (reverse) { var tmp; tmp = a; a = b; b = tmp; }
          if (ignoreCase) { a[0] = a[0].toLowerCase(); b[0] = b[0].toLowerCase(); }
          return (a[0] < b[0]) ? -1 : 1;
        }
        numPart.sort(pattern ? comparePatternFn : compareFn);
        if (pattern) {
          for (var i = 0; i < numPart.length; i++) {
            numPart[i] = numPart[i].input;
          }
        } else if (!number) { textPart.sort(compareFn); }
        text = (!reverse) ? textPart.concat(numPart) : numPart.concat(textPart);
        if (unique) { // Remove duplicate lines
          var textOld = text;
          var lastLine;
          text = [];
          for (var i = 0; i < textOld.length; i++) {
            if (textOld[i] != lastLine) {
              text.push(textOld[i]);
            }
            lastLine = textOld[i];
          }
        }
        cm.replaceRange(text.join('\n'), curStart, curEnd);
      },
      vglobal: function(cm, params) {
        // global inspects params.commandName
        this.global(cm, params);
      },
      normal: function(cm, params) {
        var argString = params.argString;
        if (argString && argString[0] == '!') {
            argString = argString.slice(1);
            noremap = true;
        }
        argString = argString.trimStart();
        if (!argString) {
          showConfirm(cm, 'Argument is required.');
          return;
        }
        var line = params.line;
        if (typeof line == 'number') {
          var lineEnd = isNaN(params.lineEnd) ? line : params.lineEnd;
          for (var i = line; i <= lineEnd; i++) {
            cm.setCursor(i, 0);
            doKeyToKey(cm, params.argString.trimStart());
            if (cm.state.vim.insertMode) {
              exitInsertMode(cm, true);
            }
          }
        } else {
          doKeyToKey(cm, params.argString.trimStart());
          if (cm.state.vim.insertMode) {
            exitInsertMode(cm, true);
          }
        }
      },
      global: function(cm, params) {
        // a global command is of the form
        // :[range]g/pattern/[cmd]
        // argString holds the string /pattern/[cmd]
        var argString = params.argString;
        if (!argString) {
          showConfirm(cm, 'Regular Expression missing from global');
          return;
        }
        var inverted = params.commandName[0] === 'v';
        if (argString[0] === '!' && params.commandName[0] === 'g') {
          inverted = true;
          argString = argString.slice(1);
        }
        // range is specified here
        var lineStart = (params.line !== undefined) ? params.line : cm.firstLine();
        var lineEnd = params.lineEnd || params.line || cm.lastLine();
        // get the tokens from argString
        var tokens = splitBySlash(argString);
        var regexPart = argString, cmd;
        if (tokens.length) {
          regexPart = tokens[0];
          cmd = tokens.slice(1, tokens.length).join('/');
        }
        if (regexPart) {
          // If regex part is empty, then use the previous query. Otherwise
          // use the regex part as the new query.
          try {
           updateSearchQuery(cm, regexPart, true /** ignoreCase */,
             true /** smartCase */);
          } catch (e) {
           showConfirm(cm, 'Invalid regex: ' + regexPart);
           return;
          }
        }
        // now that we have the regexPart, search for regex matches in the
        // specified range of lines
        var query = getSearchState(cm).getQuery();
        var matchedLines = [];
        for (var i = lineStart; i <= lineEnd; i++) {
          var line = cm.getLine(i);
          var matched = query.test(line);
          if (matched !== inverted) {
            matchedLines.push(cmd ? cm.getLineHandle(i) : line);
          }
        }
        // if there is no [cmd], just display the list of matched lines
        if (!cmd) {
          showConfirm(cm, matchedLines.join('\n'));
          return;
        }
        var index = 0;
        var nextCommand = function() {
          if (index < matchedLines.length) {
            var lineHandle = matchedLines[index++];
            var lineNum = cm.getLineNumber(lineHandle);
            if (lineNum == null) {
              nextCommand();
              return;
            }
            var command = (lineNum + 1) + cmd;
            exCommandDispatcher.processCommand(cm, command, {
              callback: nextCommand
            });
          } else if (cm.releaseLineHandles) {
            cm.releaseLineHandles();
          }
        };
        nextCommand();
      },
      substitute: function(cm, params) {
        if (!cm.getSearchCursor) {
          throw new Error('Search feature not available. Requires searchcursor.js or ' +
              'any other getSearchCursor implementation.');
        }
        var argString = params.argString;
        var tokens = argString ? splitBySeparator(argString, argString[0]) : [];
        var regexPart, replacePart = '', trailing, flagsPart, count;
        var confirm = false; // Whether to confirm each replace.
        var global = false; // True to replace all instances on a line, false to replace only 1.
        if (tokens.length) {
          regexPart = tokens[0];
          if (getOption('pcre') && regexPart !== '') {
              regexPart = new RegExp(regexPart).source; //normalize not escaped characters
          }
          replacePart = tokens[1];
          if (replacePart !== undefined) {
            if (getOption('pcre')) {
              replacePart = unescapeRegexReplace(replacePart.replace(/([^\\])&/g,"$1$$&"));
            } else {
              replacePart = translateRegexReplace(replacePart);
            }
            vimGlobalState.lastSubstituteReplacePart = replacePart;
          }
          trailing = tokens[2] ? tokens[2].split(' ') : [];
        } else {
          // either the argString is empty or its of the form ' hello/world'
          // actually splitBySlash returns a list of tokens
          // only if the string starts with a '/'
          if (argString && argString.length) {
            showConfirm(cm, 'Substitutions should be of the form ' +
                ':s/pattern/replace/');
            return;
          }
        }
        // After the 3rd slash, we can have flags followed by a space followed
        // by count.
        if (trailing) {
          flagsPart = trailing[0];
          count = parseInt(trailing[1]);
          if (flagsPart) {
            if (flagsPart.indexOf('c') != -1) {
              confirm = true;
            }
            if (flagsPart.indexOf('g') != -1) {
              global = true;
            }
            if (getOption('pcre')) {
               regexPart = regexPart + '/' + flagsPart;
            } else {
               regexPart = regexPart.replace(/\//g, "\\/") + '/' + flagsPart;
            }
          }
        }
        if (regexPart) {
          // If regex part is empty, then use the previous query. Otherwise use
          // the regex part as the new query.
          try {
            updateSearchQuery(cm, regexPart, true /** ignoreCase */,
              true /** smartCase */);
          } catch (e) {
            showConfirm(cm, 'Invalid regex: ' + regexPart);
            return;
          }
        }
        replacePart = replacePart || vimGlobalState.lastSubstituteReplacePart;
        if (replacePart === undefined) {
          showConfirm(cm, 'No previous substitute regular expression');
          return;
        }
        var state = getSearchState(cm);
        var query = state.getQuery();
        var lineStart = (params.line !== undefined) ? params.line : cm.getCursor().line;
        var lineEnd = params.lineEnd || lineStart;
        if (lineStart == cm.firstLine() && lineEnd == cm.lastLine()) {
          lineEnd = Infinity;
        }
        if (count) {
          lineStart = lineEnd;
          lineEnd = lineStart + count - 1;
        }
        var startPos = clipCursorToContent(cm, new Pos(lineStart, 0));
        var cursor = cm.getSearchCursor(query, startPos);
        doReplace(cm, confirm, global, lineStart, lineEnd, cursor, query, replacePart, params.callback);
      },
      startinsert: function(cm, params) {
        doKeyToKey(cm, params.argString == '!' ? 'A' : 'i', {});
      },
      redo: CodeMirror.commands.redo,
      undo: CodeMirror.commands.undo,
      write: function(cm) {
        if (CodeMirror.commands.save) {
          // If a save command is defined, call it.
          CodeMirror.commands.save(cm);
        } else if (cm.save) {
          // Saves to text area if no save command is defined and cm.save() is available.
          cm.save();
        }
      },
      nohlsearch: function(cm) {
        clearSearchHighlight(cm);
      },
      yank: function (cm) {
        var cur = copyCursor(cm.getCursor());
        var line = cur.line;
        var lineText = cm.getLine(line);
        vimGlobalState.registerController.pushText(
          '0', 'yank', lineText, true, true);
      },
      delete: function(cm, params) {
        var line = params.selectionLine;
        var lineEnd = isNaN(params.selectionLineEnd) ? line : params.selectionLineEnd;
        operators.delete(cm, {linewise: true}, [
          { anchor: new Pos(line, 0),
            head: new Pos(lineEnd + 1, 0) }
        ]);
      },
      join: function(cm, params) {
        var line = params.selectionLine;
        var lineEnd = isNaN(params.selectionLineEnd) ? line : params.selectionLineEnd;
        cm.setCursor(new Pos(line, 0));
        actions.joinLines(cm, {repeat: lineEnd - line}, cm.state.vim);
      },
      delmarks: function(cm, params) {
        if (!params.argString || !trim(params.argString)) {
          showConfirm(cm, 'Argument required');
          return;
        }

        var state = cm.state.vim;
        var stream = new CodeMirror.StringStream(trim(params.argString));
        while (!stream.eol()) {
          stream.eatSpace();

          // Record the streams position at the beginning of the loop for use
          // in error messages.
          var count = stream.pos;

          if (!stream.match(/[a-zA-Z]/, false)) {
            showConfirm(cm, 'Invalid argument: ' + params.argString.substring(count));
            return;
          }

          var sym = stream.next();
          // Check if this symbol is part of a range
          if (stream.match('-', true)) {
            // This symbol is part of a range.

            // The range must terminate at an alphabetic character.
            if (!stream.match(/[a-zA-Z]/, false)) {
              showConfirm(cm, 'Invalid argument: ' + params.argString.substring(count));
              return;
            }

            var startMark = sym;
            var finishMark = stream.next();
            // The range must terminate at an alphabetic character which
            // shares the same case as the start of the range.
            if (isLowerCase(startMark) && isLowerCase(finishMark) ||
                isUpperCase(startMark) && isUpperCase(finishMark)) {
              var start = startMark.charCodeAt(0);
              var finish = finishMark.charCodeAt(0);
              if (start >= finish) {
                showConfirm(cm, 'Invalid argument: ' + params.argString.substring(count));
                return;
              }

              // Because marks are always ASCII values, and we have
              // determined that they are the same case, we can use
              // their char codes to iterate through the defined range.
              for (var j = 0; j <= finish - start; j++) {
                var mark = String.fromCharCode(start + j);
                delete state.marks[mark];
              }
            } else {
              showConfirm(cm, 'Invalid argument: ' + startMark + '-');
              return;
            }
          } else {
            // This symbol is a valid mark, and is not part of a range.
            delete state.marks[sym];
          }
        }
      }
    };

    var exCommandDispatcher = new ExCommandDispatcher();

    /**
    * @param {CodeMirror} cm CodeMirror instance we are in.
    * @param {boolean} confirm Whether to confirm each replace.
    * @param {Cursor} lineStart Line to start replacing from.
    * @param {Cursor} lineEnd Line to stop replacing at.
    * @param {RegExp} query Query for performing matches with.
    * @param {string} replaceWith Text to replace matches with. May contain $1,
    *     $2, etc for replacing captured groups using JavaScript replace.
    * @param {function()} callback A callback for when the replace is done.
    */
    function doReplace(cm, confirm, global, lineStart, lineEnd, searchCursor, query,
        replaceWith, callback) {
      // Set up all the functions.
      cm.state.vim.exMode = true;
      var done = false;
      var lastPos, modifiedLineNumber, joined;
      function replaceAll() {
        cm.operation(function() {
          while (!done) {
            replace();
            next();
          }
          stop();
        });
      }
      function replace() {
        var text = cm.getRange(searchCursor.from(), searchCursor.to());
        var newText = text.replace(query, replaceWith);
        var unmodifiedLineNumber = searchCursor.to().line;
        searchCursor.replace(newText);
        modifiedLineNumber = searchCursor.to().line;
        lineEnd += modifiedLineNumber - unmodifiedLineNumber;
        joined = modifiedLineNumber < unmodifiedLineNumber;
      }
      function findNextValidMatch() {
        var lastMatchTo = lastPos && copyCursor(searchCursor.to());
        var match = searchCursor.findNext();
        if (match && !match[0] && lastMatchTo && cursorEqual(searchCursor.from(), lastMatchTo)) {
          match = searchCursor.findNext();
        }
        return match;
      }
      function next() {
        // The below only loops to skip over multiple occurrences on the same
        // line when 'global' is not true.
        while(findNextValidMatch() &&
              isInRange(searchCursor.from(), lineStart, lineEnd)) {
          if (!global && searchCursor.from().line == modifiedLineNumber && !joined) {
            continue;
          }
          cm.scrollIntoView(searchCursor.from(), 30);
          cm.setSelection(searchCursor.from(), searchCursor.to());
          lastPos = searchCursor.from();
          done = false;
          return;
        }
        done = true;
      }
      function stop(close) {
        if (close) { close(); }
        cm.focus();
        if (lastPos) {
          cm.setCursor(lastPos);
          var vim = cm.state.vim;
          vim.exMode = false;
          vim.lastHPos = vim.lastHSPos = lastPos.ch;
        }
        if (callback) { callback(); }
      }
      function onPromptKeyDown(e, _value, close) {
        // Swallow all keys.
        CodeMirror.e_stop(e);
        var keyName = vimKeyFromEvent(e);
        switch (keyName) {
          case 'y':
            replace(); next(); break;
          case 'n':
            next(); break;
          case 'a':
            // replaceAll contains a call to close of its own. We don't want it
            // to fire too early or multiple times.
            var savedCallback = callback;
            callback = undefined;
            cm.operation(replaceAll);
            callback = savedCallback;
            break;
          case 'l':
            replace();
            // fall through and exit.
          case 'q':
          case '<Esc>':
          case '<C-c>':
          case '<C-[>':
            stop(close);
            break;
        }
        if (done) { stop(close); }
        return true;
      }

      // Actually do replace.
      next();
      if (done) {
        showConfirm(cm, 'No matches for ' + query.source);
        return;
      }
      if (!confirm) {
        replaceAll();
        if (callback) { callback(); }
        return;
      }
      showPrompt(cm, {
        prefix: dom('span', 'replace with ', dom('strong', replaceWith), ' (y/n/a/q/l)'),
        onKeyDown: onPromptKeyDown
      });
    }

    function exitInsertMode(cm, keepCursor) {
      var vim = cm.state.vim;
      var macroModeState = vimGlobalState.macroModeState;
      var insertModeChangeRegister = vimGlobalState.registerController.getRegister('.');
      var isPlaying = macroModeState.isPlaying;
      var lastChange = macroModeState.lastInsertModeChanges;
      if (!isPlaying) {
        cm.off('change', onChange);
        if (vim.insertEnd) vim.insertEnd.clear();
        vim.insertEnd = null;
        CodeMirror.off(cm.getInputField(), 'keydown', onKeyEventTargetKeyDown);
      }
      if (!isPlaying && vim.insertModeRepeat > 1) {
        // Perform insert mode repeat for commands like 3,a and 3,o.
        repeatLastEdit(cm, vim, vim.insertModeRepeat - 1,
            true /** repeatForInsert */);
        vim.lastEditInputState.repeatOverride = vim.insertModeRepeat;
      }
      delete vim.insertModeRepeat;
      vim.insertMode = false;
      if (!keepCursor) {
        cm.setCursor(cm.getCursor().line, cm.getCursor().ch-1);
      }
      cm.setOption('keyMap', 'vim');
      cm.setOption('disableInput', true);
      cm.toggleOverwrite(false); // exit replace mode if we were in it.
      // update the ". register before exiting insert mode
      insertModeChangeRegister.setText(lastChange.changes.join(''));
      CodeMirror.signal(cm, "vim-mode-change", {mode: "normal"});
      if (macroModeState.isRecording) {
        logInsertModeChange(macroModeState);
      }
    }

    function _mapCommand(command) {
      defaultKeymap.unshift(command);
    }

    function mapCommand(keys, type, name, args, extra) {
      var command = {keys: keys, type: type};
      command[type] = name;
      command[type + "Args"] = args;
      for (var key in extra)
        command[key] = extra[key];
      _mapCommand(command);
    }

    // The timeout in milliseconds for the two-character ESC keymap should be
    // adjusted according to your typing speed to prevent false positives.
    defineOption('insertModeEscKeysTimeout', 200, 'number');


    function executeMacroRegister(cm, vim, macroModeState, registerName) {
      var register = vimGlobalState.registerController.getRegister(registerName);
      if (registerName == ':') {
        // Read-only register containing last Ex command.
        if (register.keyBuffer[0]) {
          exCommandDispatcher.processCommand(cm, register.keyBuffer[0]);
        }
        macroModeState.isPlaying = false;
        return;
      }
      var keyBuffer = register.keyBuffer;
      var imc = 0;
      macroModeState.isPlaying = true;
      macroModeState.replaySearchQueries = register.searchQueries.slice(0);
      for (var i = 0; i < keyBuffer.length; i++) {
        var text = keyBuffer[i];
        var match, key;
        while (text) {
          // Pull off one command key, which is either a single character
          // or a special sequence wrapped in '<' and '>', e.g. '<Space>'.
          match = (/<\w+-.+?>|<\w+>|./).exec(text);
          key = match[0];
          text = text.substring(match.index + key.length);
          vimApi.handleKey(cm, key, 'macro');
          if (vim.insertMode) {
            var changes = register.insertModeChanges[imc++].changes;
            vimGlobalState.macroModeState.lastInsertModeChanges.changes =
                changes;
            repeatInsertModeChanges(cm, changes, 1);
            exitInsertMode(cm);
          }
        }
      }
      macroModeState.isPlaying = false;
    }

    function logKey(macroModeState, key) {
      if (macroModeState.isPlaying) { return; }
      var registerName = macroModeState.latestRegister;
      var register = vimGlobalState.registerController.getRegister(registerName);
      if (register) {
        register.pushText(key);
      }
    }

    function logInsertModeChange(macroModeState) {
      if (macroModeState.isPlaying) { return; }
      var registerName = macroModeState.latestRegister;
      var register = vimGlobalState.registerController.getRegister(registerName);
      if (register && register.pushInsertModeChanges) {
        register.pushInsertModeChanges(macroModeState.lastInsertModeChanges);
      }
    }

    function logSearchQuery(macroModeState, query) {
      if (macroModeState.isPlaying) { return; }
      var registerName = macroModeState.latestRegister;
      var register = vimGlobalState.registerController.getRegister(registerName);
      if (register && register.pushSearchQuery) {
        register.pushSearchQuery(query);
      }
    }

    /**
     * Listens for changes made in insert mode.
     * Should only be active in insert mode.
     */
    function onChange(cm, changeObj) {
      var macroModeState = vimGlobalState.macroModeState;
      var lastChange = macroModeState.lastInsertModeChanges;
      if (!macroModeState.isPlaying) {
        var vim = cm.state.vim;
        while(changeObj) {
          lastChange.expectCursorActivityForChange = true;
          if (lastChange.ignoreCount > 1) {
            lastChange.ignoreCount--;
          } else if (changeObj.origin == '+input' || changeObj.origin == 'paste'
              || changeObj.origin === undefined /* only in testing */) {
            var selectionCount = cm.listSelections().length;
            if (selectionCount > 1)
              lastChange.ignoreCount = selectionCount;
            var text = changeObj.text.join('\n');
            if (lastChange.maybeReset) {
              lastChange.changes = [];
              lastChange.maybeReset = false;
            }
            if (text) {
              if (cm.state.overwrite && !/\n/.test(text)) {
                lastChange.changes.push([text]);
              } else {
                if (text.length > 1) {
                  var insertEnd = vim && vim.insertEnd && vim.insertEnd.find()
                  var cursor = cm.getCursor();
                  if (insertEnd && insertEnd.line == cursor.line) {
                    var offset = insertEnd.ch - cursor.ch;
                    if (offset > 0 && offset < text.length) {
                      lastChange.changes.push([text, offset]);
                      text = '';
                    }
                  }
                }
                if (text) lastChange.changes.push(text);
              }
            }
          }
          // Change objects may be chained with next.
          changeObj = changeObj.next;
        }
      }
    }

    /**
    * Listens for any kind of cursor activity on CodeMirror.
    */
    function onCursorActivity(cm) {
      var vim = cm.state.vim;
      if (vim.insertMode) {
        // Tracking cursor activity in insert mode (for macro support).
        var macroModeState = vimGlobalState.macroModeState;
        if (macroModeState.isPlaying) { return; }
        var lastChange = macroModeState.lastInsertModeChanges;
        if (lastChange.expectCursorActivityForChange) {
          lastChange.expectCursorActivityForChange = false;
        } else {
          // Cursor moved outside the context of an edit. Reset the change.
          lastChange.maybeReset = true;
          if (vim.insertEnd) vim.insertEnd.clear();
          vim.insertEnd = cm.setBookmark(cm.getCursor(), {insertLeft: true});
        }
      } else if (!cm.curOp.isVimOp) {
        handleExternalSelection(cm, vim);
      }
    }
    function handleExternalSelection(cm, vim, keepHPos) {
      var anchor = cm.getCursor('anchor');
      var head = cm.getCursor('head');
      // Enter or exit visual mode to match mouse selection.
      if (vim.visualMode && !cm.somethingSelected()) {
        exitVisualMode(cm, false);
      } else if (!vim.visualMode && !vim.insertMode && cm.somethingSelected()) {
        vim.visualMode = true;
        vim.visualLine = false;
        CodeMirror.signal(cm, "vim-mode-change", {mode: "visual"});
      }
      if (vim.visualMode) {
        // Bind CodeMirror selection model to vim selection model.
        // Mouse selections are considered visual characterwise.
        var headOffset = !cursorIsBefore(head, anchor) ? -1 : 0;
        var anchorOffset = cursorIsBefore(head, anchor) ? -1 : 0;
        head = offsetCursor(head, 0, headOffset);
        anchor = offsetCursor(anchor, 0, anchorOffset);
        vim.sel = {
          anchor: anchor,
          head: head
        };
        updateMark(cm, vim, '<', cursorMin(head, anchor));
        updateMark(cm, vim, '>', cursorMax(head, anchor));
      } else if (!vim.insertMode && !keepHPos) {
        // Reset lastHPos if selection was modified by something outside of vim mode e.g. by mouse.
        vim.lastHPos = cm.getCursor().ch;
      }
    }

    /** Wrapper for special keys pressed in insert mode */
    function InsertModeKey(keyName, e) {
      this.keyName = keyName;
      this.key = e.key;
      this.ctrlKey = e.ctrlKey;
      this.altKey = e.altKey;
      this.metaKey = e.metaKey;
      this.shiftKey = e.shiftKey;
    }

    /**
    * Handles raw key down events from the text area.
    * - Should only be active in insert mode.
    * - For recording deletes in insert mode.
    */
    function onKeyEventTargetKeyDown(e) {
      var macroModeState = vimGlobalState.macroModeState;
      var lastChange = macroModeState.lastInsertModeChanges;
      var keyName = CodeMirror.keyName ? CodeMirror.keyName(e) : e.key;
      if (!keyName) { return; }
      
      if (keyName.indexOf('Delete') != -1 || keyName.indexOf('Backspace') != -1) {
        if (lastChange.maybeReset) {
          lastChange.changes = [];
          lastChange.maybeReset = false;
        }
        lastChange.changes.push(new InsertModeKey(keyName, e));
      }
    }

    /**
     * Repeats the last edit, which includes exactly 1 command and at most 1
     * insert. Operator and motion commands are read from lastEditInputState,
     * while action commands are read from lastEditActionCommand.
     *
     * If repeatForInsert is true, then the function was called by
     * exitInsertMode to repeat the insert mode changes the user just made. The
     * corresponding enterInsertMode call was made with a count.
     */
    function repeatLastEdit(cm, vim, repeat, repeatForInsert) {
      var macroModeState = vimGlobalState.macroModeState;
      macroModeState.isPlaying = true;
      var isAction = !!vim.lastEditActionCommand;
      var cachedInputState = vim.inputState;
      function repeatCommand() {
        if (isAction) {
          commandDispatcher.processAction(cm, vim, vim.lastEditActionCommand);
        } else {
          commandDispatcher.evalInput(cm, vim);
        }
      }
      function repeatInsert(repeat) {
        if (macroModeState.lastInsertModeChanges.changes.length > 0) {
          // For some reason, repeat cw in desktop VIM does not repeat
          // insert mode changes. Will conform to that behavior.
          repeat = !vim.lastEditActionCommand ? 1 : repeat;
          var changeObject = macroModeState.lastInsertModeChanges;
          repeatInsertModeChanges(cm, changeObject.changes, repeat);
        }
      }
      vim.inputState = vim.lastEditInputState;
      if (isAction && vim.lastEditActionCommand.interlaceInsertRepeat) {
        // o and O repeat have to be interlaced with insert repeats so that the
        // insertions appear on separate lines instead of the last line.
        for (var i = 0; i < repeat; i++) {
          repeatCommand();
          repeatInsert(1);
        }
      } else {
        if (!repeatForInsert) {
          // Hack to get the cursor to end up at the right place. If I is
          // repeated in insert mode repeat, cursor will be 1 insert
          // change set left of where it should be.
          repeatCommand();
        }
        repeatInsert(repeat);
      }
      vim.inputState = cachedInputState;
      if (vim.insertMode && !repeatForInsert) {
        // Don't exit insert mode twice. If repeatForInsert is set, then we
        // were called by an exitInsertMode call lower on the stack.
        exitInsertMode(cm);
      }
      macroModeState.isPlaying = false;
    }

    function sendCmKey(cm, key) {
      CodeMirror.lookupKey(key, 'vim-insert', function keyHandler(binding) {
        if (typeof binding == 'string') {
          CodeMirror.commands[binding](cm);
        } else {
          binding(cm);
        }
        return true;
      });
    }
    function repeatInsertModeChanges(cm, changes, repeat) {
      var head = cm.getCursor('head');
      var visualBlock = vimGlobalState.macroModeState.lastInsertModeChanges.visualBlock;
      if (visualBlock) {
        // Set up block selection again for repeating the changes.
        selectForInsert(cm, head, visualBlock + 1);
        repeat = cm.listSelections().length;
        cm.setCursor(head);
      }
      for (var i = 0; i < repeat; i++) {
        if (visualBlock) {
          cm.setCursor(offsetCursor(head, i, 0));
        }
        for (var j = 0; j < changes.length; j++) {
          var change = changes[j];
          if (change instanceof InsertModeKey) {
            sendCmKey(cm, change.keyName, change);
          } else if (typeof change == "string") {
            cm.replaceSelection(change);
          } else {
            var start = cm.getCursor();
            var end = offsetCursor(start, 0, change[0].length - (change[1] || 0));
            cm.replaceRange(change[0], start, change[1] ? start: end);
            cm.setCursor(end);
          }
        }
      }
      if (visualBlock) {
        cm.setCursor(offsetCursor(head, 0, 1));
      }
    }

    // multiselect support
  // Initialize Vim and make it available as an API.
  CodeMirror.Vim = vimApi;

  var specialKeyAce = {'return':'CR',backspace:'BS','delete':'Del',esc:'Esc',
    left:'Left',right:'Right',up:'Up',down:'Down',space: 'Space',insert: 'Ins',
    home:'Home',end:'End',pageup:'PageUp',pagedown:'PageDown', enter: 'CR'
  };
  function lookupKey(hashId, key, e, vim) {
    if (key.length > 1 && key[0] == "n") {
      key = key.replace("numpad", "");
    }
    key = specialKeyAce[key] || key;
    var name = '';
    if (e.ctrlKey) { name += 'C-'; }
    if (e.altKey) { name += 'A-'; }
    if ((name || key.length > 1) && e.shiftKey) { name += 'S-'; }

    if (vim && !vim.expectLiteralNext && key.length == 1) {
      if (langmap.keymap && key in langmap.keymap) {
        if (langmap.remapCtrl !== false || !name)
          key = langmap.keymap[key];
      } else if (key.charCodeAt(0) > 255) {
        var code = e.code && e.code.slice(-1) || "";
        if (!e.shiftKey) code = code.toLowerCase();
        if (code) key = code;
      }
    }

    name += key;
    if (name.length > 1) { name = '<' + name + '>'; }
    return name;
  }
  var handleKey = vimApi.handleKey.bind(vimApi);
  vimApi.handleKey = function(cm, key, origin) {
    return cm.operation(function() {
      return handleKey(cm, key, origin);
    }, true);
  }
    function cloneVimState(state) {
      var n = new state.constructor();
      Object.keys(state).forEach(function(key) {
        if (key == "insertEnd") return;
        var o = state[key];
        if (Array.isArray(o))
          o = o.slice();
        else if (o && typeof o == "object" && o.constructor != Object)
          o = cloneVimState(o);
        n[key] = o;
      });
      if (state.sel) {
        n.sel = {
          head: state.sel.head && copyCursor(state.sel.head),
          anchor: state.sel.anchor && copyCursor(state.sel.anchor)
        };
      }
      return n;
    }
    function multiSelectHandleKey(cm, key, origin) {
      var isHandled = false;
      var vim = vimApi.maybeInitVimState_(cm);
      var visualBlock = vim.visualBlock || vim.wasInVisualBlock;

      var wasMultiselect = cm.ace.inMultiSelectMode;
      if (vim.wasInVisualBlock && !wasMultiselect) {
        vim.wasInVisualBlock = false;
      } else if (wasMultiselect && vim.visualBlock) {
         vim.wasInVisualBlock = true;
      }

    if (key == '<Esc>' && !vim.insertMode && !vim.visualMode && wasMultiselect) {
      cm.ace.exitMultiSelectMode();
    } else if (visualBlock || !wasMultiselect || cm.ace.inVirtualSelectionMode) {
      isHandled = vimApi.handleKey(cm, key, origin);
      } else {
        var old = cloneVimState(vim);
        var changeQueueList = vim.inputState.changeQueueList || [];

        cm.operation(function() {
          cm.curOp.isVimOp = true;
          var index = 0;
          cm.ace.forEachSelection(function() {
            var sel = cm.ace.selection;
            cm.state.vim.lastHPos = sel.$desiredColumn == null ? sel.lead.column : sel.$desiredColumn;
            cm.state.vim.inputState.changeQueue = changeQueueList[index];
            var head = cm.getCursor("head");
            var anchor = cm.getCursor("anchor");
            var headOffset = !cursorIsBefore(head, anchor) ? -1 : 0;
            var anchorOffset = cursorIsBefore(head, anchor) ? -1 : 0;
            head = offsetCursor(head, 0, headOffset);
            anchor = offsetCursor(anchor, 0, anchorOffset);
            cm.state.vim.sel.head = head;
            cm.state.vim.sel.anchor = anchor;

            isHandled = handleKey(cm, key, origin);
            sel.$desiredColumn = cm.state.vim.lastHPos == -1 ? null : cm.state.vim.lastHPos;
            // TODO why does cm.virtualSelectionMode check index?
            if (cm.ace.inVirtualSelectionMode) {
              changeQueueList[index] = cm.state.vim.inputState.changeQueue;
            }
            if (cm.virtualSelectionMode()) {
              cm.state.vim = cloneVimState(old);
            }
            index++;
          });
          if (cm.curOp.cursorActivity && !isHandled)
            cm.curOp.cursorActivity = false;
          vim.status = cm.state.vim.status;
          cm.state.vim = vim;
          vim.inputState.changeQueueList = changeQueueList;
          vim.inputState.changeQueue = null;
        }, true);
      }
      // some commands may bring visualMode and selection out of sync
      if (isHandled && !vim.visualMode && !vim.insert && vim.visualMode != cm.somethingSelected()) {
        handleExternalSelection(cm, vim, true);
      }
      return isHandled;
    }
    resetVimGlobalState();


  exports.CodeMirror = CodeMirror;
  var getVim = vimApi.maybeInitVimState_;
  exports.handler = {
    $id: "ace/keyboard/vim",
    drawCursor: function(element, pixelPos, config, sel, session) {
      var vim = this.state.vim || {};
      var w = config.characterWidth;
      var h = config.lineHeight;
      var top = pixelPos.top;
      var left = pixelPos.left;
      if (!vim.insertMode) {
        var isbackwards = !sel.cursor
            ? session.selection.isBackwards() || session.selection.isEmpty()
            : Range.comparePoints(sel.cursor, sel.start) <= 0;
        if (!isbackwards && left > w)
          left -= w;
      }
      if (!vim.insertMode && vim.status) {
        h = h / 2;
        top += h;
      }
      domLib.translate(element, left, top);
      domLib.setStyle(element.style, "width", w + "px");
      domLib.setStyle(element.style, "height", h + "px");
    },
    $getDirectionForHighlight: function (editor) {
      var cm = editor.state.cm;
      var vim = getVim(cm);
      if (!vim.insertMode) {
        return editor.session.selection.isBackwards() || editor.session.selection.isEmpty();
      }
    },
    handleKeyboard: function(data, hashId, key, keyCode, e) {
      var editor = data.editor;
      var cm = editor.state.cm;
      var vim = getVim(cm);
      if (keyCode == -1) return;

      // in non-insert mode we try to find the ascii key corresponding to the text in textarea
      // this is needed because in languages that use latin alphabet we want to get the key that browser sends to the textarea
      // and in non
      if (!vim.insertMode) {
        if (hashId == -1) {
          if (key.charCodeAt(0) > 0xFF) {
            if (data.inputKey) {
              key = data.inputKey;
              if (key && data.inputHash == 4)
                key = key.toUpperCase();
            }
          }
          data.inputChar = key;
        }
        else if (hashId == 4 || hashId == 0) {
          if (data.inputKey == key && data.inputHash == hashId && data.inputChar) {
            // on mac text input doesn't repeat
            key = data.inputChar;
            hashId = -1
          }
          else {
            data.inputChar = null;
            data.inputKey = key;
            data.inputHash = hashId;
          }
        }
        else {
          data.inputChar = data.inputKey = null;
        }
      }
      
      if (cm.state.overwrite && vim.insertMode && key == "backspace" && hashId == 0) {
        return {command: "gotoleft"}
      }

      // ctrl-c is special it both exits mode and copies text
      if (key == "c" && hashId == 1) { // key == "ctrl-c"
        if (!useragent.isMac && editor.getCopyText()) {
          editor.once("copy", function() {
            if (vim.insertMode) editor.selection.clearSelection();
            else cm.operation(function() { exitVisualMode(cm); });
          });
          return {command: "null", passEvent: true};
        }
      }

      if (key == "esc" && !vim.insertMode && !vim.visualMode && !cm.ace.inMultiSelectMode) {
        var searchState = getSearchState(cm);
        var overlay = searchState.getOverlay();
        if (overlay) cm.removeOverlay(overlay);
      }

      if (hashId == -1 || hashId & 1 || hashId === 0 && key.length > 1) {
        var insertMode = vim.insertMode;
        var name = lookupKey(hashId, key, e || {}, vim);
        if (vim.status == null)
          vim.status = "";
        var isHandled = multiSelectHandleKey(cm, name, 'user');
        vim = getVim(cm); // may be changed by multiSelectHandleKey
        if (isHandled && vim.status != null)
          vim.status += name;
        else if (vim.status == null)
          vim.status = "";
        cm._signal("changeStatus");
        if (!isHandled && (hashId != -1 || insertMode))
          return;
        return {command: "null", passEvent: !isHandled};
      }
    },
    attach: function(editor) {
      if (!editor.state) editor.state = {};
      var cm = new CodeMirror(editor);
      editor.state.cm = cm;
      editor.$vimModeHandler = this;
      enterVimMode(cm);
      getVim(cm).status = null;
      cm.on('vim-command-done', function() {
        if (cm.virtualSelectionMode()) return;
        getVim(cm).status = null;
        cm.ace._signal("changeStatus");
        cm.ace.session.markUndoGroup();
      });
      cm.on("changeStatus", function() {
        cm.ace.renderer.updateCursor();
        cm.ace._signal("changeStatus");
      });
      cm.on("vim-mode-change", function() {
        if (cm.virtualSelectionMode()) return;
        updateInputMode();
        cm._signal("changeStatus");
      });
      function updateInputMode() {
        var isIntsert = getVim(cm).insertMode;
        cm.ace.renderer.setStyle("normal-mode", !isIntsert);
        editor.textInput.setCommandMode(!isIntsert);
        // without this press and hodl popup in mac is shown in normal mode
        editor.renderer.$keepTextAreaAtCursor = isIntsert;
        editor.renderer.$blockCursor = !isIntsert;
      }
      updateInputMode();
      editor.renderer.$cursorLayer.drawCursor = this.drawCursor.bind(cm);
    },
    detach: function(editor) {
      var cm = editor.state.cm;
      leaveVimMode(cm);
      cm.destroy();
      editor.state.cm = null;
      editor.$vimModeHandler = null;
      editor.renderer.$cursorLayer.drawCursor = null;
      editor.renderer.setStyle("normal-mode", false);
      editor.textInput.setCommandMode(false);
      editor.renderer.$keepTextAreaAtCursor = true;
    },
    getStatusText: function(editor) {
      var cm = editor.state.cm;
      var vim = getVim(cm);
      if (vim.insertMode)
        return "INSERT";
      var status = "";
      if (vim.visualMode) {
        status += "VISUAL";
        if (vim.visualLine)
          status += " LINE";
        if (vim.visualBlock)
          status += " BLOCK";
      }
      if (vim.status)
        status += (status ? " " : "") + vim.status;
      return status;
    }
  };
  vimApi.defineOption({
    name: "wrap",
    set: function(value, cm) {
      if (cm) {cm.ace.setOption("wrap", value)}
    },
    type: "boolean"
  }, false);
  vimApi.defineEx('write', 'w', function() {
    console.log(':write is not implemented')
  });
  defaultKeymap.push(
    { keys: 'zc', type: 'action', action: 'fold', actionArgs: { open: false } },
    { keys: 'zC', type: 'action', action: 'fold', actionArgs: { open: false, all: true } },
    { keys: 'zo', type: 'action', action: 'fold', actionArgs: { open: true } },
    { keys: 'zO', type: 'action', action: 'fold', actionArgs: { open: true, all: true } },
    { keys: 'za', type: 'action', action: 'fold', actionArgs: { toggle: true } },
    { keys: 'zA', type: 'action', action: 'fold', actionArgs: { toggle: true, all: true } },
    { keys: 'zf', type: 'action', action: 'fold', actionArgs: { open: true, all: true } },
    { keys: 'zd', type: 'action', action: 'fold', actionArgs: { open: true, all: true } },

    { keys: '<C-A-k>', type: 'action', action: 'aceCommand', actionArgs: { name: "addCursorAbove" } },
    { keys: '<C-A-j>', type: 'action', action: 'aceCommand', actionArgs: { name: "addCursorBelow" } },
    { keys: '<C-A-S-k>', type: 'action', action: 'aceCommand', actionArgs: { name: "addCursorAboveSkipCurrent" } },
    { keys: '<C-A-S-j>', type: 'action', action: 'aceCommand', actionArgs: { name: "addCursorBelowSkipCurrent" } },
    { keys: '<C-A-h>', type: 'action', action: 'aceCommand', actionArgs: { name: "selectMoreBefore" } },
    { keys: '<C-A-l>', type: 'action', action: 'aceCommand', actionArgs: { name: "selectMoreAfter" } },
    { keys: '<C-A-S-h>', type: 'action', action: 'aceCommand', actionArgs: { name: "selectNextBefore" } },
    { keys: '<C-A-S-l>', type: 'action', action: 'aceCommand', actionArgs: { name: "selectNextAfter" } }
  );
  
  defaultKeymap.push({
    keys: 'gq',
    type: 'operator',
    operator: 'hardWrap'
  });
  vimApi.defineOperator("hardWrap", function(cm, operatorArgs, ranges, oldAnchor, newHead) {
    var anchor = ranges[0].anchor.line;
    var head = ranges[0].head.line;
    if (operatorArgs.linewise) head--;
    hardWrap(cm.ace, {startRow: anchor, endRow: head});
    return Pos(head, 0);
  });
  defineOption('textwidth', undefined, 'number', ['tw'], function(width, cm) {
    // Option is local. Do nothing for global.
    if (cm === undefined) {
      return;
    }
    // The 'filetype' option proxies to the CodeMirror 'mode' option.
    if (width === undefined) {
      var value = cm.ace.getOption('printMarginColumn');
      return value;
    } else {
      var column = Math.round(width);
      if (column > 1) {
        cm.ace.setOption('printMarginColumn', column);
      }
    }
  });
    
  actions.aceCommand = function(cm, actionArgs, vim) {
    cm.vimCmd = actionArgs;
    if (cm.ace.inVirtualSelectionMode)
      cm.ace.on("beforeEndOperation", delayedExecAceCommand);
    else
      delayedExecAceCommand(null, cm.ace);
  };
  function delayedExecAceCommand(op, ace) {
    ace.off("beforeEndOperation", delayedExecAceCommand);
    var cmd = ace.state.cm.vimCmd;
    if (cmd) {
      ace.execCommand(cmd.exec ? cmd : cmd.name, cmd.args);
    }
    ace.curOp = ace.prevOp;
  }
  actions.fold = function(cm, actionArgs, vim) {
    cm.ace.execCommand(['toggleFoldWidget', 'toggleFoldWidget', 'foldOther', 'unfoldall'
      ][(actionArgs.all ? 2 : 0) + (actionArgs.open ? 1 : 0)]);
  };

  defaultKeymapLength = defaultKeymap.length; // ace_patch

  exports.handler.defaultKeymap = defaultKeymap;
  exports.handler.actions = actions;
  exports.Vim = vimApi;
