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

(function(mod) {
  if (typeof exports == "object" && typeof module == "object") // CommonJS
    mod(require("../lib/codemirror"), require("../addon/search/searchcursor"), require("../addon/dialog/dialog"), require("../addon/edit/matchbrackets.js"));
  else if (typeof define == "function" && define.amd) // AMD
    define(["../lib/codemirror", "../addon/search/searchcursor", "../addon/dialog/dialog", "../addon/edit/matchbrackets"], mod);
  else // Plain browser env
    mod(CodeMirror);
})(function(CodeMirror) {
  'use strict';

/**
   * 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: 'unmap' },
    { 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: 'nohlsearch', shortName: 'noh' },
    { name: 'yank', shortName: 'y' },
    { name: 'delmarks', shortName: 'delm' },
    { name: 'registers', shortName: 'reg', excludeFromCommandHistory: true },
    { name: 'vglobal', shortName: 'v' },
    { name: 'global', shortName: 'g' }
  ];

var Pos = CodeMirror.Pos;

var Vim = function() {
    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;
    }

function detachVimMap(cm, next) {
      if (this == CodeMirror.keyMap.vim) {
        CodeMirror.rmClass(cm.getWrapperElement(), "cm-fat-cursor");
        if (cm.getOption("inputStyle") == "contenteditable" && document.body.style.caretColor != null) {
          disableFatCursorMark(cm);
          cm.getInputField().style.caretColor = "";
        }
      }

if (!next || next.attach != attachVimMap)
        leaveVimMode(cm);
    }
    function attachVimMap(cm, prev) {
      if (this == CodeMirror.keyMap.vim) {
        CodeMirror.addClass(cm.getWrapperElement(), "cm-fat-cursor");
        if (cm.getOption("inputStyle") == "contenteditable" && document.body.style.caretColor != null) {
          enableFatCursorMark(cm);
          cm.getInputField().style.caretColor = "transparent";
        }
      }

if (!prev || prev.attach != attachVimMap)
        enterVimMode(cm);
    }

function clearFatCursorMark(cm) {
      var marks = cm.state.fatCursorMarks;
      if (marks) for (var i = 0; i < marks.length; i++) marks[i].clear();
    }

function enableFatCursorMark(cm) {
      cm.state.fatCursorMarks = [];
      updateFatCursorMark(cm)
      cm.on("cursorActivity", updateFatCursorMark)
    }

function disableFatCursorMark(cm) {
      clearFatCursorMark(cm);
      cm.off("cursorActivity", updateFatCursorMark);
      // explicitly set fatCursorMarks to null because event listener above
      // can be invoke after removing it, if off is called from operation
      cm.state.fatCursorMarks = null;
    }

// Deprecated, simply setting the keymap works again.
    CodeMirror.defineOption('vimMode', false, function(cm, val, prev) {
      if (val && cm.getOption("keyMap") != "vim")
        cm.setOption("keyMap", "vim");
      else if (!val && prev != CodeMirror.Init && /^vim/.test(cm.getOption("keyMap")))
        cm.setOption("keyMap", "default");
    });

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);
      }
    });

// 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
      };
    };

var lastInsertModeKeyTimer;
    var vimApi= {
      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) {
        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) {
        function toCtxArray(ctx) {
          return ctx ? [ctx] : ['normal', 'insert', 'visual'];
        }
        var ctxsToMap = toCtxArray(ctx);
        // Look through all actual defaults to find a map candidate.
        var actualLength = defaultKeymap.length, origLength = defaultKeymapLength;
        for (var i = actualLength - origLength;
             i < actualLength && ctxsToMap.length;
             i++) {
          var mapping = defaultKeymap[i];
          // Omit mappings that operate in the wrong context(s) and those of invalid type.
          if (mapping.keys == rhs &&
              (!ctx || !mapping.context || mapping.context === ctx) &&
              mapping.type.substr(0, 2) !== 'ex' &&
              mapping.type.substr(0, 3) !== 'key') {
            // Make a shallow copy of the original keymap entry.
            var newMapping = {};
            for (var key in mapping) {
              newMapping[key] = mapping[key];
            }
            // Modify it point to the new mapping with the proper context.
            newMapping.keys = lhs;
            if (ctx && !newMapping.context) {
              newMapping.context = ctx;
            }
            // Add it to the keymap with a higher priority than the original.
            this._mapCommand(newMapping);
            // Record the mapped contexts as complete.
            var mappedCtxs = toCtxArray(mapping.context);
            ctxsToMap = ctxsToMap.filter(function(el) { return mappedCtxs.indexOf(el) === -1; });
          }
        }
        // TODO: Create non-recursive keyToKey mappings for the unmapped contexts once those exist.
      },
      // 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);
                  }
                }
              }
            }
          }
        }
      },
      // 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();
        }
      },
      /**
       * 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>') {
            // Clear input state and get back to normal mode.
            clearInputState(cm);
            if (vim.visualMode) {
              exitVisualMode(cm);
            } else if (vim.insertMode) {
              exitInsertMode(cm);
            }
            return true;
          }
        }
        function doKeyToKey(keys) {
          // TODO: prevent infinite recursion.
          var match;
          while (keys) {
            // 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(keys);
            key = match[0];
            keys = keys.substring(match.index + key.length);
            CodeMirror.Vim.handleKey(cm, key, 'mapping');
          }
        }

if (lastInsertModeKeyTimer) { window.clearTimeout(lastInsertModeKeyTimer); }
          if (keysAreChars) {
            var selections = cm.listSelections();
            for (var i = 0; i < selections.length; i++) {
              var here = selections[i].head;
              cm.replaceRange('', offsetCursor(here, 0, -(keys.length - 1)), here, '+input');
            }
            vimGlobalState.macroModeState.lastInsertModeChanges.changes.pop();
          }
          clearInputState(cm);
          return match.command;
        }

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

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

vim.inputState.keyBuffer = '';
          var 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() {
            return cm.operation(function() {
              cm.curOp.isVimOp = true;
              try {
                if (command.type == 'keyToKey') {
                  doKeyToKey(command.toKeys);
                } 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 (!CodeMirror.Vim.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
    };

// 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.
    }
    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();
      CodeMirror.signal(cm, 'vim-command-done', reason);
    }

/*
     * 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');
      }
      if (registers[name]) {
        throw Error('Register already defined ' + name);
      }
      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();
    }
    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);
        }
        // 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);
      },
      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'};
        }

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>') {
          var character = lastChar(keys);
          if (!character) return {type: 'none'};
          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.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) {
          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 = CodeMirror.keyName(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 != 'Left' && keyName != 'Right' && keyName != 'Ctrl' && keyName != 'Alt' && keyName != 'Shift')
              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 = CodeMirror.keyName(e);
          if (keyName == 'Esc' || keyName == 'Ctrl-C' || keyName == 'Ctrl-[' ||
              (keyName == 'Backspace' && 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 == 'Ctrl-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, false /** inclusive */,
                true /** forward */, false /** bigWord */,
                true /** noSymbol */);
            var isKeyword = true;
            if (!word) {
              word = expandWordUnderCursor(cm, false /** inclusive */,
                  true /** forward */, false /** bigWord */,
                  false /** noSymbol */);
              isKeyword = false;
            }
            if (!word) {
              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);
        }
        function onPromptKeyDown(e, input, close) {
          var keyName = CodeMirror.keyName(e), up, offset;
          if (keyName == 'Esc' || keyName == 'Ctrl-C' || keyName == 'Ctrl-[' ||
              (keyName == 'Backspace' && 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 == 'Ctrl-U') {
            // Ctrl-U clears input.
            CodeMirror.e_stop(e);
            close('');
          } else {
            if ( keyName != 'Left' && keyName != 'Right' && keyName != 'Ctrl' && keyName != 'Alt' && keyName != 'Shift')
              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) {
            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);
            }
            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) {
            newHead = clipCursorToContent(cm, newHead);
            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 = Pos(oldAnchor.line + lineOffset, oldAnchor.ch);
            } else if (lastSel.visualBlock) {
              // Blockwise Visual mode: The same number of lines and columns.
              newHead = 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 = 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 = 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';
            cmSel = makeCmSelection(cm, {
              anchor: curStart,
              head: curEnd
            }, 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 = 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;
            cmSel = makeCmSelection(cm, {
              anchor: curStart,
              head: curEnd
            }, 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 Pos(line, findFirstNonWhiteSpaceCharacter(cm.getLine(line)));
      },
      moveToMiddleLine: function(cm) {
        var range = getUserVisibleLines(cm);
        var line = Math.floor((range.top + range.bottom) * 0.5);
        return Pos(line, findFirstNonWhiteSpaceCharacter(cm.getLine(line)));
      },
      moveToBottomLine: function(cm, _head, motionArgs) {
        var line = getUserVisibleLines(cm).bottom - motionArgs.repeat +1;
        return 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 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 = 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, Pos(sel.anchor.line, sel.head.ch)),
            clipCursorToContent(cm, 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 = 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 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();
        var posV = cm.findPosV(cur, (motionArgs.forward ? repeat : -repeat), 'line', vim.lastHSPos);
        var hasMarkedText = motionArgs.forward ? posV.line > line : posV.line < line;
        if (hasMarkedText) {
          line = posV.line;
          endCh = posV.ch;
        }
        // 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);
        }
        if (motionArgs.toFirstChar){
          endCh=findFirstNonWhiteSpaceCharacter(cm.getLine(line));
          vim.lastHPos = endCh;
        }
        vim.lastHSPos = cm.charCoords(Pos(line, endCh),'div').left;
        return 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(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;
        var 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);
        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;
      },
      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 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(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 = (ch === '<' || ch === '>') ? /[(){}[\]<>]/ : /[(){}[\]]/;
          var matched = cm.findMatchingBracket(Pos(line, ch), {bracketRegex: re});
          return matched.to;
        } else {
          return cursor;
        }
      },
      moveToStartOfLine: function(_cm, head) {
        return 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 Pos(lineNum,
                   findFirstNonWhiteSpaceCharacter(cm.getLine(lineNum)));
      },
      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};

// 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;
        if (mirroredPairs[character]) {
          tmp = selectCompanionObject(cm, head, character, inclusive);
        } else if (selfPaired[character]) {
          tmp = findBeginningAndEnd(cm, head, character, inclusive);
        } else if (character === 'W') {
          tmp = expandWordUnderCursor(cm, inclusive, true /** forward */,
                                                     true /** bigWord */);
        } else if (character === 'w') {
          tmp = expandWordUnderCursor(cm, inclusive, true /** forward */,
                                                     false /** bigWord */);
        } 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 {
          // No text object defined for this, don't move.
          return null;
        }

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

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 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;

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
     * If includeLineBreak is true, then allow cur.ch == lineLength.
     */
    function clipCursorToContent(cm, cur) {
      var vim = cm.state.vim;
      var includeLineBreak = vim.insertMode || vim.visualMode;
      var line = Math.min(Math.max(cm.firstLine(), cur.line), cm.lastLine() );
      var maxCh = lineLength(cm, line) - 1 + !!includeLineBreak;
      var ch = Math.min(Math.max(0, cur.ch), maxCh);
      return 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 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.
      var match, partial = [], full = [];
      for (var i = 0; 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) {
      if (mapped.slice(-11) == '<character>') {
        // Last character matches anything.
        var prefixLen = mapped.length - 11;
        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 = /^.*(<[^>]+>)$/.exec(keys);
      var selectedCharacter = match ? match[1] : keys.slice(-1);
      if (selectedCharacter.length > 1){
        switch(selectedCharacter){
          case '<CR>':
            selectedCharacter='\n';
            break;
          case '<Space>':
            selectedCharacter=' ';
            break;
          default:
            selectedCharacter='';
            break;
        }
      }
      return selectedCharacter;
    }
    function repeatFn(cm, fn, repeat) {
      return function() {
        for (var i = 0; i < repeat; i++) {
          fn(cm);
        }
      };
    }
    function copyCursor(cur) {
      return Pos(cur.line, cur.ch);
    }
    function cursorEqual(cur1, cur2) {
      return cur1.ch == cur2.ch && cur1.line == cur2.line;
    }
    function cursorIsBefore(cur1, cur2) {
      if (cur1.line < cur2.line) {
        return true;
      }
      if (cur1.line == cur2.line && cur1.ch < cur2.ch) {
        return true;
      }
      return false;
    }
    function cursorMin(cur1, cur2) {
      if (arguments.length > 2) {
        cur2 = cursorMin.apply(undefined, Array.prototype.slice.call(arguments, 1));
      }
      return cursorIsBefore(cur1, cur2) ? cur1 : cur2;
    }
    function cursorMax(cur1, cur2) {
      if (arguments.length > 2) {
        cur2 = cursorMax.apply(undefined, Array.prototype.slice.call(arguments, 1));
      }
      return cursorIsBefore(cur1, cur2) ? cur2 : cur1;
    }
    function cursorIsBetween(cur1, cur2, cur3) {
      // returns true if cur2 is between cur1 and cur3.
      var cur1before2 = cursorIsBefore(cur1, cur2);
      var cur2before3 = cursorIsBefore(cur2, cur3);
      return cur1before2 && cur2before3;
    }
    function lineLength(cm, lineNum) {
      return cm.getLine(lineNum).length;
    }
    function trim(s) {
      if (s.trim) {
        return s.trim();
      }
      return s.replace(/^\s+|\s+$/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(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;

/**
     * 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"});
      clearFakeCursor(vim);
    }

// 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, _forward, bigWord, noSymbol) {
      var cur = getHead(cm);
      var line = cm.getLine(cur.line);
      var idx = cur.ch;

// Seek to first word or non-whitespace character, depending on if
      // noSymbol is true.
      var test = noSymbol ? wordCharTest[0] : bigWordCharTest [0];
      while (!test(line.charAt(idx))) {
        idx++;
        if (idx >= line.length) { return null; }
      }

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(end)) && end < line.length) { end++; }
      while (test(line.charAt(start)) && start >= 0) { start--; }
      start++;

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

/*
     * 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 = 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 Pos(lastWord.line, lastWord.from);
      } else if (forward && wordEnd) {
        return 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 Pos(lastWord.line, lastWord.to);
      } else {
        // b
        return Pos(lastWord.line, lastWord.from);
      }
    }

function moveToEol(cm, head, motionArgs, vim, keepHPos) {
      var cur = head;
      var retval= 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 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, Pos(line, repeat - 1));
    }

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 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;

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

if (!start || !end) {
        return { start: cur, end: cur };
      }

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;
        // Why is this line even here???
        // cm.setCursor(cur.line, firstIndex+1);
      }
      // otherwise if the cursor is currently on the closing symbol
      else if (firstIndex < cur.ch && chars[cur.ch] == symb) {
        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: Pos(cur.line, start),
        end: 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) ? 'i' : undefined);
      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 makePrompt(prefix, desc) {
      return dom(document.createDocumentFragment(),
               dom('span', {$fontFamily: 'monospace', $whiteSpace: 'pre'},
                 prefix,
                 dom('input', {type: 'text', autocorrect: 'off',
                               autocapitalize: 'off', spellcheck: 'false'})),
               desc && dom('span', {$color: '#888'}, desc));
    }

// 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) ? Pos(cm.lastLine()) : Pos(cm.firstLine(), 0) );
            if (!cursor.find(prev)) {
              return;
            }
          }
        }
        return [cursor.from(), cursor.to()];
      });
    }
    function clearSearchHighlight(cm) {
      var state = getSearchState(cm);
      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) {
      var scrollInfo = cm.getScrollInfo();
      var occludeToleranceTop = 6;
      var occludeToleranceBottom = 10;
      var from = cm.coordsChar({left:0, top: occludeToleranceTop + scrollInfo.top}, 'local');
      var bottomY = scrollInfo.clientHeight - occludeToleranceBottom + scrollInfo.top;
      var to = cm.coordsChar({left:0, top: bottomY}, 'local');
      return {top: from.line, bottom: to.line};
    }

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

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

// 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) {
        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 {
          if (rhs != ':' && rhs.charAt(0) == ':') {
            // Key to Ex mapping.
            var mapping = {
              keys: lhs,
              type: 'keyToEx',
              exArgs: { input: rhs.substring(1) }
            };
            if (ctx) { mapping.context = ctx; }
            defaultKeymap.unshift(mapping);
          } else {
            // Key to key mapping
            var mapping = {
              keys: lhs,
              type: 'keyToKey',
              toKeys: rhs
            };
            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;
          }
        } 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;
            }
          }
        }
        throw Error('No such mapping.');
      }
    };

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;
        }
        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 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 next() {
        // The below only loops to skip over multiple occurrences on the same
        // line when 'global' is not true.
        while(searchCursor.findNext() &&
              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 = CodeMirror.keyName(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 'Ctrl-C':
          case 'Ctrl-[':
            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
      });
    }

CodeMirror.keyMap.vim = {
      attach: attachVimMap,
      detach: detachVimMap,
      call: cmKey
    };

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');

CodeMirror.keyMap['vim-insert'] = {
      // TODO: override navigation keys so that Esc will cancel automatic
      // indentation from o, O, i_<CR>
      fallthrough: ['default'],
      attach: attachVimMap,
      detach: detachVimMap,
      call: cmKey
    };

CodeMirror.keyMap['vim-replace'] = {
      'Backspace': 'goCharLeft',
      fallthrough: ['vim-insert'],
      attach: attachVimMap,
      detach: detachVimMap,
      call: cmKey
    };

/**
     * 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) {
        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 {
                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;
        }
      } else if (!cm.curOp.isVimOp) {
        handleExternalSelection(cm, vim);
      }
      if (vim.visualMode) {
        updateFakeCursor(cm);
      }
    }
    /**
     * Keeps track of a fake cursor to support visual mode cursor behavior.
     */
    function updateFakeCursor(cm) {
      var className = 'cm-animate-fat-cursor';
      var vim = cm.state.vim;
      var from = clipCursorToContent(cm, copyCursor(vim.sel.head));
      var to = offsetCursor(from, 0, 1);
      clearFakeCursor(vim);
      // In visual mode, the cursor may be positioned over EOL.
      if (from.ch == cm.getLine(from.line).length) {
        var widget = dom('span', { 'class': className }, '\u00a0');
        vim.fakeCursorBookmark = cm.setBookmark(from, {widget: widget});
      } else {
        vim.fakeCursor = cm.markText(from, to, {className: className});
      }
    }
    function clearFakeCursor(vim) {
      if (vim.fakeCursor) {
        vim.fakeCursor.clear();
        vim.fakeCursor = null;
      }
      if (vim.fakeCursorBookmark) {
        vim.fakeCursorBookmark.clear();
        vim.fakeCursorBookmark = null;
      }
    }
    function handleExternalSelection(cm, vim) {
      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) {
        // 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) {
      this.keyName = keyName;
    }

/**
    * 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(e);
      if (!keyName) { return; }
      function onKeyFound() {
        if (lastChange.maybeReset) {
          lastChange.changes = [];
          lastChange.maybeReset = false;
        }
        lastChange.changes.push(new InsertModeKey(keyName));
        return true;
      }
      if (keyName.indexOf('Delete') != -1 || keyName.indexOf('Backspace') != -1) {
        CodeMirror.lookupKey(keyName, 'vim-insert', onKeyFound);
      }
    }

/**
     * 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;
    }

resetVimGlobalState();
    return vimApi;
  };
  // Initialize Vim and make it available as an API.
  CodeMirror.Vim = Vim();
});