/*! 
 * angular-hotkeys v1.4.5
 * https://chieffancypants.github.io/angular-hotkeys
 * Copyright (c) 2014 Wes Cruver
 * License: MIT
 */
/*
 * angular-hotkeys
 *
 * Automatic keyboard shortcuts for your angular apps
 *
 * (c) 2014 Wes Cruver
 * License: MIT
 */

(function() {

  'use strict';

  angular.module('cfp.hotkeys', []).provider('hotkeys', function() {

    /**
     * Configurable setting to disable the cheatsheet entirely
     * @type {Boolean}
     */
    this.includeCheatSheet = true;

    /**
     * Configurable setting for the cheat sheet title
     * @type {String}
     */

    this.templateTitle = 'Keyboard Shortcuts:';

    /**
     * Cheat sheet template in the event you want to totally customize it.
     * @type {String}
     */
    this.template = '<div class="cfp-hotkeys-container fade" ng-class="{in: helpVisible}" style="display: none;"><div class="cfp-hotkeys">' +
                      '<h4 class="cfp-hotkeys-title">{{ title }}</h4>' +
                      '<table><tbody>' +
                        '<tr ng-repeat="hotkey in hotkeys | filter:{ description: \'!$$undefined$$\' }">' +
                          '<td class="cfp-hotkeys-keys">' +
                            '<span ng-repeat="key in hotkey.format() track by $index" class="cfp-hotkeys-key">{{ key }}</span>' +
                          '</td>' +
                          '<td class="cfp-hotkeys-text">{{ hotkey.description }}</td>' +
                        '</tr>' +
                      '</tbody></table>' +
                      '<div class="cfp-hotkeys-close" ng-click="toggleCheatSheet()">×</div>' +
                    '</div></div>';

    /**
     * Configurable setting for the cheat sheet hotkey
     * @type {String}
     */
    this.cheatSheetHotkey = '?';

    /**
     * Configurable setting for the cheat sheet description
     * @type {String}
     */
    this.cheatSheetDescription = 'Show / hide this help menu';

    this.$get = ['$rootElement', '$rootScope', '$compile', '$window', '$document', function ($rootElement, $rootScope, $compile, $window, $document) {

      // monkeypatch Mousetrap's stopCallback() function
      // this version doesn't return true when the element is an INPUT, SELECT, or TEXTAREA
      // (instead we will perform this check per-key in the _add() method)
      Mousetrap.stopCallback = function(event, element) {
        // if the element has the class "mousetrap" then no need to stop
        if ((' ' + element.className + ' ').indexOf(' mousetrap ') > -1) {
          return false;
        }

        return (element.contentEditable && element.contentEditable == 'true');
      };

      /**
       * Convert strings like cmd into symbols like ⌘
       * @param  {String} combo Key combination, e.g. 'mod+f'
       * @return {String}       The key combination with symbols
       */
      function symbolize (combo) {
        var map = {
          command   : '⌘',
          shift     : '⇧',
          left      : '←',
          right     : '→',
          up        : '↑',
          down      : '↓',
          'return'  : '↩',
          backspace : '⌫'
        };
        combo = combo.split('+');

        for (var i = 0; i < combo.length; i++) {
          // try to resolve command / ctrl based on OS:
          if (combo[i] === 'mod') {
            if ($window.navigator && $window.navigator.platform.indexOf('Mac') >=0 ) {
              combo[i] = 'command';
            } else {
              combo[i] = 'ctrl';
            }
          }

          combo[i] = map[combo[i]] || combo[i];
        }

        return combo.join(' + ');
      }

      /**
       * Hotkey object used internally for consistency
       *
       * @param {array}    combo       The keycombo. it's an array to support multiple combos
       * @param {String}   description Description for the keycombo
       * @param {Function} callback    function to execute when keycombo pressed
       * @param {string}   action      the type of event to listen for (for mousetrap)
       * @param {array}    allowIn     an array of tag names to allow this combo in ('INPUT', 'SELECT', and/or 'TEXTAREA')
       * @param {Boolean}  persistent  Whether the hotkey persists navigation events
       */
      function Hotkey (combo, description, callback, action, allowIn, persistent) {
        // TODO: Check that the values are sane because we could
        // be trying to instantiate a new Hotkey with outside dev's
        // supplied values

        this.combo = combo instanceof Array ? combo : [combo];
        this.description = description;
        this.callback = callback;
        this.action = action;
        this.allowIn = allowIn;
        this.persistent = persistent;
      }

      /**
       * Helper method to format (symbolize) the key combo for display
       *
       * @return {[Array]} An array of the key combination sequence
       *   for example: "command+g c i" becomes ["⌘ + g", "c", "i"]
       *
       * TODO: this gets called a lot.  We should cache the result
       */
      Hotkey.prototype.format = function() {

        // Don't show all the possible key combos, just the first one.  Not sure
        // of usecase here, so open a ticket if my assumptions are wrong
        var combo = this.combo[0];

        var sequence = combo.split(/[\s]/);
        for (var i = 0; i < sequence.length; i++) {
          sequence[i] = symbolize(sequence[i]);
        }

        return sequence;
      };

      /**
       * A new scope used internally for the cheatsheet
       * @type {$rootScope.Scope}
       */
      var scope = $rootScope.$new();

      /**
       * Holds an array of Hotkey objects currently bound
       * @type {Array}
       */
      scope.hotkeys = [];

      /**
       * Contains the state of the help's visibility
       * @type {Boolean}
       */
      scope.helpVisible = false;

      /**
       * Holds the title string for the help menu
       * @type {String}
       */
      scope.title = this.templateTitle;

      /**
       * Expose toggleCheatSheet to hotkeys scope so we can call it using
       * ng-click from the template
       * @type {function}
       */
      scope.toggleCheatSheet = toggleCheatSheet;


      /**
       * Holds references to the different scopes that have bound hotkeys
       * attached.  This is useful to catch when the scopes are `$destroy`d and
       * then automatically unbind the hotkey.
       *
       * @type {Array}
       */
      var boundScopes = [];


      $rootScope.$on('$routeChangeSuccess', function (event, route) {
        purgeHotkeys();

        if (route && route.hotkeys) {
          angular.forEach(route.hotkeys, function (hotkey) {
            // a string was given, which implies this is a function that is to be
            // $eval()'d within that controller's scope
            // TODO: hotkey here is super confusing.  sometimes a function (that gets turned into an array), sometimes a string
            var callback = hotkey[2];
            if (typeof(callback) === 'string' || callback instanceof String) {
              hotkey[2] = [callback, route];
            }

            // todo: perform check to make sure not already defined:
            // this came from a route, so it's likely not meant to be persistent
            hotkey[5] = false;
            _add.apply(this, hotkey);
          });
        }
      });


      // Auto-create a help menu:
      if (this.includeCheatSheet) {
        var document = $document[0];
        var element = $rootElement[0];
        var helpMenu = angular.element(this.template);
        _add(this.cheatSheetHotkey, this.cheatSheetDescription, toggleCheatSheet);

        // If $rootElement is document or documentElement, then body must be used
        if (element === document || element === document.documentElement) {
          element = document.body;
        }

        angular.element(element).append($compile(helpMenu)(scope));
      }


      /**
       * Purges all non-persistent hotkeys (such as those defined in routes)
       *
       * Without this, the same hotkey would get recreated everytime
       * the route is accessed.
       */
      function purgeHotkeys() {
        var i = scope.hotkeys.length;
        while (i--) {
          var hotkey = scope.hotkeys[i];
          if (hotkey && !hotkey.persistent) {
            _del(hotkey);
          }
        }
      }

      /**
       * Toggles the help menu element's visiblity
       */
      var previousEsc = false;

      function toggleCheatSheet() {
        scope.helpVisible = !scope.helpVisible;

        // Bind to esc to remove the cheat sheet.  Ideally, this would be done
        // as a directive in the template, but that would create a nasty
        // circular dependency issue that I don't feel like sorting out.
        if (scope.helpVisible) {
          previousEsc = _get('esc');
          _del('esc');

          // Here's an odd way to do this: we're going to use the original
          // description of the hotkey on the cheat sheet so that it shows up.
          // without it, no entry for esc will ever show up (#22)
          _add('esc', previousEsc.description, toggleCheatSheet);
        } else {
          _del('esc');

          // restore the previously bound ESC key
          if (previousEsc !== false) {
            _add(previousEsc);
          }
        }
      }

      /**
       * Creates a new Hotkey and creates the Mousetrap binding
       *
       * @param {string}   combo       mousetrap key binding
       * @param {string}   description description for the help menu
       * @param {Function} callback    method to call when key is pressed
       * @param {string}   action      the type of event to listen for (for mousetrap)
       * @param {array}    allowIn     an array of tag names to allow this combo in ('INPUT', 'SELECT', and/or 'TEXTAREA')
       * @param {boolean}  persistent  if true, the binding is preserved upon route changes
       */
      function _add (combo, description, callback, action, allowIn, persistent) {

        // used to save original callback for "allowIn" wrapping:
        var _callback;

        // these elements are prevented by the default Mousetrap.stopCallback():
        var preventIn = ['INPUT', 'SELECT', 'TEXTAREA'];

        // Determine if object format was given:
        var objType = Object.prototype.toString.call(combo);

        if (objType === '[object Object]') {
          description = combo.description;
          callback    = combo.callback;
          action      = combo.action;
          persistent  = combo.persistent;
          allowIn     = combo.allowIn;
          combo       = combo.combo;
        }

        // description is optional:
        if (description instanceof Function) {
          action = callback;
          callback = description;
          description = '$$undefined$$';
        } else if (angular.isUndefined(description)) {
          description = '$$undefined$$';
        }

        // any items added through the public API are for controllers
        // that persist through navigation, and thus undefined should mean
        // true in this case.
        if (persistent === undefined) {
          persistent = true;
        }

        // if callback is defined, then wrap it in a function
        // that checks if the event originated from a form element.
        // the function blocks the callback from executing unless the element is specified
        // in allowIn (emulates Mousetrap.stopCallback() on a per-key level)
        if (typeof callback === 'function') {

          // save the original callback
          _callback = callback;

          // make sure allowIn is an array
          if (!(allowIn instanceof Array)) {
            allowIn = [];
          }

          // remove anything from preventIn that's present in allowIn
          var index;
          for (var i=0; i < allowIn.length; i++) {
            allowIn[i] = allowIn[i].toUpperCase();
            index = preventIn.indexOf(allowIn[i]);
            if (index !== -1) {
              preventIn.splice(index, 1);
            }
          }

          // create the new wrapper callback
          callback = function(event) {
            var shouldExecute = true;
            var target = event.target || event.srcElement; // srcElement is IE only
            var nodeName = target.nodeName.toUpperCase();

            // check if the input has a mousetrap class, and skip checking preventIn if so
            if ((' ' + target.className + ' ').indexOf(' mousetrap ') > -1) {
              shouldExecute = true;
            } else {
              // don't execute callback if the event was fired from inside an element listed in preventIn
              for (var i=0; i<preventIn.length; i++) {
                if (preventIn[i] === nodeName) {
                  shouldExecute = false;
                  break;
                }
              }
            }

            if (shouldExecute) {
              wrapApply(_callback.apply(this, arguments));
            }
          };
        }

        if (typeof(action) === 'string') {
          Mousetrap.bind(combo, wrapApply(callback), action);
        } else {
          Mousetrap.bind(combo, wrapApply(callback));
        }

        var hotkey = new Hotkey(combo, description, callback, action, allowIn, persistent);
        scope.hotkeys.push(hotkey);
        return hotkey;
      }

      /**
       * delete and unbind a Hotkey
       *
       * @param  {mixed} hotkey   Either the bound key or an instance of Hotkey
       * @return {boolean}        true if successful
       */
      function _del (hotkey) {
        var combo = (hotkey instanceof Hotkey) ? hotkey.combo : hotkey;

        Mousetrap.unbind(combo);

        if (angular.isArray(combo)) {
          var retStatus = true;
          var i = combo.length;
          while (i--) {
            retStatus = _del(combo[i]) && retStatus;
          }
          return retStatus;
        } else {
          var index = scope.hotkeys.indexOf(_get(combo));

          if (index > -1) {
            // if the combo has other combos bound, don't unbind the whole thing, just the one combo:
            if (scope.hotkeys[index].combo.length > 1) {
              scope.hotkeys[index].combo.splice(scope.hotkeys[index].combo.indexOf(combo), 1);
            } else {
              scope.hotkeys.splice(index, 1);
            }
            return true;
          }
        }

        return false;

      }

      /**
       * Get a Hotkey object by key binding
       *
       * @param  {[string]} combo  the key the Hotkey is bound to
       * @return {Hotkey}          The Hotkey object
       */
      function _get (combo) {

        var hotkey;

        for (var i = 0; i < scope.hotkeys.length; i++) {
          hotkey = scope.hotkeys[i];

          if (hotkey.combo.indexOf(combo) > -1) {
            return hotkey;
          }
        }

        return false;
      }

      /**
       * Binds the hotkey to a particular scope.  Useful if the scope is
       * destroyed, we can automatically destroy the hotkey binding.
       *
       * @param  {Object} scope The scope to bind to
       */
      function bindTo (scope) {
        // Only initialize once to allow multiple calls for same scope.
        if (!(scope.$id in boundScopes)) {

          // Add the scope to the list of bound scopes
          boundScopes[scope.$id] = [];

          scope.$on('$destroy', function () {
            var i = boundScopes[scope.$id].length;
            while (i--) {
              _del(boundScopes[scope.$id][i]);
              delete boundScopes[scope.$id][i];
            }
          });
        }
        // return an object with an add function so we can keep track of the
        // hotkeys and their scope that we added via this chaining method
        return {
          add: function (args) {
            var hotkey;

            if (arguments.length > 1) {
              hotkey = _add.apply(this, arguments);
            } else {
              hotkey = _add(args);
            }

            boundScopes[scope.$id].push(hotkey);
            return this;
          }
        };
      }

      /**
       * All callbacks sent to Mousetrap are wrapped using this function
       * so that we can force a $scope.$apply()
       *
       * @param  {Function} callback [description]
       * @return {[type]}            [description]
       */
      function wrapApply (callback) {
        // return mousetrap a function to call
        return function (event, combo) {

          // if this is an array, it means we provided a route object
          // because the scope wasn't available yet, so rewrap the callback
          // now that the scope is available:
          if (callback instanceof Array) {
            var funcString = callback[0];
            var route = callback[1];
            callback = function (event) {
              route.scope.$eval(funcString);
            };
          }

          // this takes place outside angular, so we'll have to call
          // $apply() to make sure angular's digest happens
          $rootScope.$apply(function() {
            // call the original hotkey callback with the keyboard event
            callback(event, _get(combo));
          });
        };
      }


      var publicApi = {
        add                   : _add,
        del                   : _del,
        get                   : _get,
        bindTo                : bindTo,
        template              : this.template,
        toggleCheatSheet      : toggleCheatSheet,
        includeCheatSheet     : this.includeCheatSheet,
        cheatSheetHotkey      : this.cheatSheetHotkey,
        cheatSheetDescription : this.cheatSheetDescription,
        purgeHotkeys          : purgeHotkeys,
        templateTitle         : this.templateTitle
      };

      return publicApi;

    }];
  })

  .directive('hotkey', ['hotkeys', function (hotkeys) {
    return {
      restrict: 'A',
      link: function (scope, el, attrs) {
        var key, allowIn;

        angular.forEach(scope.$eval(attrs.hotkey), function (func, hotkey) {
          // split and trim the hotkeys string into array
          allowIn = typeof attrs.hotkeyAllowIn === "string" ? attrs.hotkeyAllowIn.split(/[\s,]+/) : [];

          key = hotkey;

          hotkeys.add({
            combo: hotkey,
            description: attrs.hotkeyDescription,
            callback: func,
            action: attrs.hotkeyAction,
            allowIn: allowIn
          });
        });

        // remove the hotkey if the directive is destroyed:
        el.bind('$destroy', function() {
          hotkeys.del(key);
        });
      }
    };
  }])

  .run(['hotkeys', function(hotkeys) {
    // force hotkeys to run by injecting it. Without this, hotkeys only runs
    // when a controller or something else asks for it via DI.
  }]);

})();

/*global define:false */
/**
 * Copyright 2013 Craig Campbell
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * Mousetrap is a simple keyboard shortcut library for Javascript with
 * no external dependencies
 *
 * @version 1.4.6
 * @url craig.is/killing/mice
 */
(function(window, document, undefined) {

    /**
     * mapping of special keycodes to their corresponding keys
     *
     * everything in this dictionary cannot use keypress events
     * so it has to be here to map to the correct keycodes for
     * keyup/keydown events
     *
     * @type {Object}
     */
    var _MAP = {
            8: 'backspace',
            9: 'tab',
            13: 'enter',
            16: 'shift',
            17: 'ctrl',
            18: 'alt',
            20: 'capslock',
            27: 'esc',
            32: 'space',
            33: 'pageup',
            34: 'pagedown',
            35: 'end',
            36: 'home',
            37: 'left',
            38: 'up',
            39: 'right',
            40: 'down',
            45: 'ins',
            46: 'del',
            91: 'meta',
            93: 'meta',
            224: 'meta'
        },

        /**
         * mapping for special characters so they can support
         *
         * this dictionary is only used incase you want to bind a
         * keyup or keydown event to one of these keys
         *
         * @type {Object}
         */
        _KEYCODE_MAP = {
            106: '*',
            107: '+',
            109: '-',
            110: '.',
            111 : '/',
            186: ';',
            187: '=',
            188: ',',
            189: '-',
            190: '.',
            191: '/',
            192: '`',
            219: '[',
            220: '\\',
            221: ']',
            222: '\''
        },

        /**
         * this is a mapping of keys that require shift on a US keypad
         * back to the non shift equivelents
         *
         * this is so you can use keyup events with these keys
         *
         * note that this will only work reliably on US keyboards
         *
         * @type {Object}
         */
        _SHIFT_MAP = {
            '~': '`',
            '!': '1',
            '@': '2',
            '#': '3',
            '$': '4',
            '%': '5',
            '^': '6',
            '&': '7',
            '*': '8',
            '(': '9',
            ')': '0',
            '_': '-',
            '+': '=',
            ':': ';',
            '\"': '\'',
            '<': ',',
            '>': '.',
            '?': '/',
            '|': '\\'
        },

        /**
         * this is a list of special strings you can use to map
         * to modifier keys when you specify your keyboard shortcuts
         *
         * @type {Object}
         */
        _SPECIAL_ALIASES = {
            'option': 'alt',
            'command': 'meta',
            'return': 'enter',
            'escape': 'esc',
            'mod': /Mac|iPod|iPhone|iPad/.test(navigator.platform) ? 'meta' : 'ctrl'
        },

        /**
         * variable to store the flipped version of _MAP from above
         * needed to check if we should use keypress or not when no action
         * is specified
         *
         * @type {Object|undefined}
         */
        _REVERSE_MAP,

        /**
         * a list of all the callbacks setup via Mousetrap.bind()
         *
         * @type {Object}
         */
        _callbacks = {},

        /**
         * direct map of string combinations to callbacks used for trigger()
         *
         * @type {Object}
         */
        _directMap = {},

        /**
         * keeps track of what level each sequence is at since multiple
         * sequences can start out with the same sequence
         *
         * @type {Object}
         */
        _sequenceLevels = {},

        /**
         * variable to store the setTimeout call
         *
         * @type {null|number}
         */
        _resetTimer,

        /**
         * temporary state where we will ignore the next keyup
         *
         * @type {boolean|string}
         */
        _ignoreNextKeyup = false,

        /**
         * temporary state where we will ignore the next keypress
         *
         * @type {boolean}
         */
        _ignoreNextKeypress = false,

        /**
         * are we currently inside of a sequence?
         * type of action ("keyup" or "keydown" or "keypress") or false
         *
         * @type {boolean|string}
         */
        _nextExpectedAction = false;

    /**
     * loop through the f keys, f1 to f19 and add them to the map
     * programatically
     */
    for (var i = 1; i < 20; ++i) {
        _MAP[111 + i] = 'f' + i;
    }

    /**
     * loop through to map numbers on the numeric keypad
     */
    for (i = 0; i <= 9; ++i) {
        _MAP[i + 96] = i;
    }

    /**
     * cross browser add event method
     *
     * @param {Element|HTMLDocument} object
     * @param {string} type
     * @param {Function} callback
     * @returns void
     */
    function _addEvent(object, type, callback) {
        if (object.addEventListener) {
            object.addEventListener(type, callback, false);
            return;
        }

        object.attachEvent('on' + type, callback);
    }

    /**
     * takes the event and returns the key character
     *
     * @param {Event} e
     * @return {string}
     */
    function _characterFromEvent(e) {

        // for keypress events we should return the character as is
        if (e.type == 'keypress') {
            var character = String.fromCharCode(e.which);

            // if the shift key is not pressed then it is safe to assume
            // that we want the character to be lowercase.  this means if
            // you accidentally have caps lock on then your key bindings
            // will continue to work
            //
            // the only side effect that might not be desired is if you
            // bind something like 'A' cause you want to trigger an
            // event when capital A is pressed caps lock will no longer
            // trigger the event.  shift+a will though.
            if (!e.shiftKey) {
                character = character.toLowerCase();
            }

            return character;
        }

        // for non keypress events the special maps are needed
        if (_MAP[e.which]) {
            return _MAP[e.which];
        }

        if (_KEYCODE_MAP[e.which]) {
            return _KEYCODE_MAP[e.which];
        }

        // if it is not in the special map

        // with keydown and keyup events the character seems to always
        // come in as an uppercase character whether you are pressing shift
        // or not.  we should make sure it is always lowercase for comparisons
        return String.fromCharCode(e.which).toLowerCase();
    }

    /**
     * checks if two arrays are equal
     *
     * @param {Array} modifiers1
     * @param {Array} modifiers2
     * @returns {boolean}
     */
    function _modifiersMatch(modifiers1, modifiers2) {
        return modifiers1.sort().join(',') === modifiers2.sort().join(',');
    }

    /**
     * resets all sequence counters except for the ones passed in
     *
     * @param {Object} doNotReset
     * @returns void
     */
    function _resetSequences(doNotReset) {
        doNotReset = doNotReset || {};

        var activeSequences = false,
            key;

        for (key in _sequenceLevels) {
            if (doNotReset[key]) {
                activeSequences = true;
                continue;
            }
            _sequenceLevels[key] = 0;
        }

        if (!activeSequences) {
            _nextExpectedAction = false;
        }
    }

    /**
     * finds all callbacks that match based on the keycode, modifiers,
     * and action
     *
     * @param {string} character
     * @param {Array} modifiers
     * @param {Event|Object} e
     * @param {string=} sequenceName - name of the sequence we are looking for
     * @param {string=} combination
     * @param {number=} level
     * @returns {Array}
     */
    function _getMatches(character, modifiers, e, sequenceName, combination, level) {
        var i,
            callback,
            matches = [],
            action = e.type;

        // if there are no events related to this keycode
        if (!_callbacks[character]) {
            return [];
        }

        // if a modifier key is coming up on its own we should allow it
        if (action == 'keyup' && _isModifier(character)) {
            modifiers = [character];
        }

        // loop through all callbacks for the key that was pressed
        // and see if any of them match
        for (i = 0; i < _callbacks[character].length; ++i) {
            callback = _callbacks[character][i];

            // if a sequence name is not specified, but this is a sequence at
            // the wrong level then move onto the next match
            if (!sequenceName && callback.seq && _sequenceLevels[callback.seq] != callback.level) {
                continue;
            }

            // if the action we are looking for doesn't match the action we got
            // then we should keep going
            if (action != callback.action) {
                continue;
            }

            // if this is a keypress event and the meta key and control key
            // are not pressed that means that we need to only look at the
            // character, otherwise check the modifiers as well
            //
            // chrome will not fire a keypress if meta or control is down
            // safari will fire a keypress if meta or meta+shift is down
            // firefox will fire a keypress if meta or control is down
            if ((action == 'keypress' && !e.metaKey && !e.ctrlKey) || _modifiersMatch(modifiers, callback.modifiers)) {

                // when you bind a combination or sequence a second time it
                // should overwrite the first one.  if a sequenceName or
                // combination is specified in this call it does just that
                //
                // @todo make deleting its own method?
                var deleteCombo = !sequenceName && callback.combo == combination;
                var deleteSequence = sequenceName && callback.seq == sequenceName && callback.level == level;
                if (deleteCombo || deleteSequence) {
                    _callbacks[character].splice(i, 1);
                }

                matches.push(callback);
            }
        }

        return matches;
    }

    /**
     * takes a key event and figures out what the modifiers are
     *
     * @param {Event} e
     * @returns {Array}
     */
    function _eventModifiers(e) {
        var modifiers = [];

        if (e.shiftKey) {
            modifiers.push('shift');
        }

        if (e.altKey) {
            modifiers.push('alt');
        }

        if (e.ctrlKey) {
            modifiers.push('ctrl');
        }

        if (e.metaKey) {
            modifiers.push('meta');
        }

        return modifiers;
    }

    /**
     * prevents default for this event
     *
     * @param {Event} e
     * @returns void
     */
    function _preventDefault(e) {
        if (e.preventDefault) {
            e.preventDefault();
            return;
        }

        e.returnValue = false;
    }

    /**
     * stops propogation for this event
     *
     * @param {Event} e
     * @returns void
     */
    function _stopPropagation(e) {
        if (e.stopPropagation) {
            e.stopPropagation();
            return;
        }

        e.cancelBubble = true;
    }

    /**
     * actually calls the callback function
     *
     * if your callback function returns false this will use the jquery
     * convention - prevent default and stop propogation on the event
     *
     * @param {Function} callback
     * @param {Event} e
     * @returns void
     */
    function _fireCallback(callback, e, combo, sequence) {

        // if this event should not happen stop here
        if (Mousetrap.stopCallback(e, e.target || e.srcElement, combo, sequence)) {
            return;
        }

        if (callback(e, combo) === false) {
            _preventDefault(e);
            _stopPropagation(e);
        }
    }

    /**
     * handles a character key event
     *
     * @param {string} character
     * @param {Array} modifiers
     * @param {Event} e
     * @returns void
     */
    function _handleKey(character, modifiers, e) {
        var callbacks = _getMatches(character, modifiers, e),
            i,
            doNotReset = {},
            maxLevel = 0,
            processedSequenceCallback = false;

        // Calculate the maxLevel for sequences so we can only execute the longest callback sequence
        for (i = 0; i < callbacks.length; ++i) {
            if (callbacks[i].seq) {
                maxLevel = Math.max(maxLevel, callbacks[i].level);
            }
        }

        // loop through matching callbacks for this key event
        for (i = 0; i < callbacks.length; ++i) {

            // fire for all sequence callbacks
            // this is because if for example you have multiple sequences
            // bound such as "g i" and "g t" they both need to fire the
            // callback for matching g cause otherwise you can only ever
            // match the first one
            if (callbacks[i].seq) {

                // only fire callbacks for the maxLevel to prevent
                // subsequences from also firing
                //
                // for example 'a option b' should not cause 'option b' to fire
                // even though 'option b' is part of the other sequence
                //
                // any sequences that do not match here will be discarded
                // below by the _resetSequences call
                if (callbacks[i].level != maxLevel) {
                    continue;
                }

                processedSequenceCallback = true;

                // keep a list of which sequences were matches for later
                doNotReset[callbacks[i].seq] = 1;
                _fireCallback(callbacks[i].callback, e, callbacks[i].combo, callbacks[i].seq);
                continue;
            }

            // if there were no sequence matches but we are still here
            // that means this is a regular match so we should fire that
            if (!processedSequenceCallback) {
                _fireCallback(callbacks[i].callback, e, callbacks[i].combo);
            }
        }

        // if the key you pressed matches the type of sequence without
        // being a modifier (ie "keyup" or "keypress") then we should
        // reset all sequences that were not matched by this event
        //
        // this is so, for example, if you have the sequence "h a t" and you
        // type "h e a r t" it does not match.  in this case the "e" will
        // cause the sequence to reset
        //
        // modifier keys are ignored because you can have a sequence
        // that contains modifiers such as "enter ctrl+space" and in most
        // cases the modifier key will be pressed before the next key
        //
        // also if you have a sequence such as "ctrl+b a" then pressing the
        // "b" key will trigger a "keypress" and a "keydown"
        //
        // the "keydown" is expected when there is a modifier, but the
        // "keypress" ends up matching the _nextExpectedAction since it occurs
        // after and that causes the sequence to reset
        //
        // we ignore keypresses in a sequence that directly follow a keydown
        // for the same character
        var ignoreThisKeypress = e.type == 'keypress' && _ignoreNextKeypress;
        if (e.type == _nextExpectedAction && !_isModifier(character) && !ignoreThisKeypress) {
            _resetSequences(doNotReset);
        }

        _ignoreNextKeypress = processedSequenceCallback && e.type == 'keydown';
    }

    /**
     * handles a keydown event
     *
     * @param {Event} e
     * @returns void
     */
    function _handleKeyEvent(e) {

        // normalize e.which for key events
        // @see http://stackoverflow.com/questions/4285627/javascript-keycode-vs-charcode-utter-confusion
        if (typeof e.which !== 'number') {
            e.which = e.keyCode;
        }

        var character = _characterFromEvent(e);

        // no character found then stop
        if (!character) {
            return;
        }

        // need to use === for the character check because the character can be 0
        if (e.type == 'keyup' && _ignoreNextKeyup === character) {
            _ignoreNextKeyup = false;
            return;
        }

        Mousetrap.handleKey(character, _eventModifiers(e), e);
    }

    /**
     * determines if the keycode specified is a modifier key or not
     *
     * @param {string} key
     * @returns {boolean}
     */
    function _isModifier(key) {
        return key == 'shift' || key == 'ctrl' || key == 'alt' || key == 'meta';
    }

    /**
     * called to set a 1 second timeout on the specified sequence
     *
     * this is so after each key press in the sequence you have 1 second
     * to press the next key before you have to start over
     *
     * @returns void
     */
    function _resetSequenceTimer() {
        clearTimeout(_resetTimer);
        _resetTimer = setTimeout(_resetSequences, 1000);
    }

    /**
     * reverses the map lookup so that we can look for specific keys
     * to see what can and can't use keypress
     *
     * @return {Object}
     */
    function _getReverseMap() {
        if (!_REVERSE_MAP) {
            _REVERSE_MAP = {};
            for (var key in _MAP) {

                // pull out the numeric keypad from here cause keypress should
                // be able to detect the keys from the character
                if (key > 95 && key < 112) {
                    continue;
                }

                if (_MAP.hasOwnProperty(key)) {
                    _REVERSE_MAP[_MAP[key]] = key;
                }
            }
        }
        return _REVERSE_MAP;
    }

    /**
     * picks the best action based on the key combination
     *
     * @param {string} key - character for key
     * @param {Array} modifiers
     * @param {string=} action passed in
     */
    function _pickBestAction(key, modifiers, action) {

        // if no action was picked in we should try to pick the one
        // that we think would work best for this key
        if (!action) {
            action = _getReverseMap()[key] ? 'keydown' : 'keypress';
        }

        // modifier keys don't work as expected with keypress,
        // switch to keydown
        if (action == 'keypress' && modifiers.length) {
            action = 'keydown';
        }

        return action;
    }

    /**
     * binds a key sequence to an event
     *
     * @param {string} combo - combo specified in bind call
     * @param {Array} keys
     * @param {Function} callback
     * @param {string=} action
     * @returns void
     */
    function _bindSequence(combo, keys, callback, action) {

        // start off by adding a sequence level record for this combination
        // and setting the level to 0
        _sequenceLevels[combo] = 0;

        /**
         * callback to increase the sequence level for this sequence and reset
         * all other sequences that were active
         *
         * @param {string} nextAction
         * @returns {Function}
         */
        function _increaseSequence(nextAction) {
            return function() {
                _nextExpectedAction = nextAction;
                ++_sequenceLevels[combo];
                _resetSequenceTimer();
            };
        }

        /**
         * wraps the specified callback inside of another function in order
         * to reset all sequence counters as soon as this sequence is done
         *
         * @param {Event} e
         * @returns void
         */
        function _callbackAndReset(e) {
            _fireCallback(callback, e, combo);

            // we should ignore the next key up if the action is key down
            // or keypress.  this is so if you finish a sequence and
            // release the key the final key will not trigger a keyup
            if (action !== 'keyup') {
                _ignoreNextKeyup = _characterFromEvent(e);
            }

            // weird race condition if a sequence ends with the key
            // another sequence begins with
            setTimeout(_resetSequences, 10);
        }

        // loop through keys one at a time and bind the appropriate callback
        // function.  for any key leading up to the final one it should
        // increase the sequence. after the final, it should reset all sequences
        //
        // if an action is specified in the original bind call then that will
        // be used throughout.  otherwise we will pass the action that the
        // next key in the sequence should match.  this allows a sequence
        // to mix and match keypress and keydown events depending on which
        // ones are better suited to the key provided
        for (var i = 0; i < keys.length; ++i) {
            var isFinal = i + 1 === keys.length;
            var wrappedCallback = isFinal ? _callbackAndReset : _increaseSequence(action || _getKeyInfo(keys[i + 1]).action);
            _bindSingle(keys[i], wrappedCallback, action, combo, i);
        }
    }

    /**
     * Converts from a string key combination to an array
     *
     * @param  {string} combination like "command+shift+l"
     * @return {Array}
     */
    function _keysFromString(combination) {
        if (combination === '+') {
            return ['+'];
        }

        return combination.split('+');
    }

    /**
     * Gets info for a specific key combination
     *
     * @param  {string} combination key combination ("command+s" or "a" or "*")
     * @param  {string=} action
     * @returns {Object}
     */
    function _getKeyInfo(combination, action) {
        var keys,
            key,
            i,
            modifiers = [];

        // take the keys from this pattern and figure out what the actual
        // pattern is all about
        keys = _keysFromString(combination);

        for (i = 0; i < keys.length; ++i) {
            key = keys[i];

            // normalize key names
            if (_SPECIAL_ALIASES[key]) {
                key = _SPECIAL_ALIASES[key];
            }

            // if this is not a keypress event then we should
            // be smart about using shift keys
            // this will only work for US keyboards however
            if (action && action != 'keypress' && _SHIFT_MAP[key]) {
                key = _SHIFT_MAP[key];
                modifiers.push('shift');
            }

            // if this key is a modifier then add it to the list of modifiers
            if (_isModifier(key)) {
                modifiers.push(key);
            }
        }

        // depending on what the key combination is
        // we will try to pick the best event for it
        action = _pickBestAction(key, modifiers, action);

        return {
            key: key,
            modifiers: modifiers,
            action: action
        };
    }

    /**
     * binds a single keyboard combination
     *
     * @param {string} combination
     * @param {Function} callback
     * @param {string=} action
     * @param {string=} sequenceName - name of sequence if part of sequence
     * @param {number=} level - what part of the sequence the command is
     * @returns void
     */
    function _bindSingle(combination, callback, action, sequenceName, level) {

        // store a direct mapped reference for use with Mousetrap.trigger
        _directMap[combination + ':' + action] = callback;

        // make sure multiple spaces in a row become a single space
        combination = combination.replace(/\s+/g, ' ');

        var sequence = combination.split(' '),
            info;

        // if this pattern is a sequence of keys then run through this method
        // to reprocess each pattern one key at a time
        if (sequence.length > 1) {
            _bindSequence(combination, sequence, callback, action);
            return;
        }

        info = _getKeyInfo(combination, action);

        // make sure to initialize array if this is the first time
        // a callback is added for this key
        _callbacks[info.key] = _callbacks[info.key] || [];

        // remove an existing match if there is one
        _getMatches(info.key, info.modifiers, {type: info.action}, sequenceName, combination, level);

        // add this call back to the array
        // if it is a sequence put it at the beginning
        // if not put it at the end
        //
        // this is important because the way these are processed expects
        // the sequence ones to come first
        _callbacks[info.key][sequenceName ? 'unshift' : 'push']({
            callback: callback,
            modifiers: info.modifiers,
            action: info.action,
            seq: sequenceName,
            level: level,
            combo: combination
        });
    }

    /**
     * binds multiple combinations to the same callback
     *
     * @param {Array} combinations
     * @param {Function} callback
     * @param {string|undefined} action
     * @returns void
     */
    function _bindMultiple(combinations, callback, action) {
        for (var i = 0; i < combinations.length; ++i) {
            _bindSingle(combinations[i], callback, action);
        }
    }

    // start!
    _addEvent(document, 'keypress', _handleKeyEvent);
    _addEvent(document, 'keydown', _handleKeyEvent);
    _addEvent(document, 'keyup', _handleKeyEvent);

    var Mousetrap = {

        /**
         * binds an event to mousetrap
         *
         * can be a single key, a combination of keys separated with +,
         * an array of keys, or a sequence of keys separated by spaces
         *
         * be sure to list the modifier keys first to make sure that the
         * correct key ends up getting bound (the last key in the pattern)
         *
         * @param {string|Array} keys
         * @param {Function} callback
         * @param {string=} action - 'keypress', 'keydown', or 'keyup'
         * @returns void
         */
        bind: function(keys, callback, action) {
            keys = keys instanceof Array ? keys : [keys];
            _bindMultiple(keys, callback, action);
            return this;
        },

        /**
         * unbinds an event to mousetrap
         *
         * the unbinding sets the callback function of the specified key combo
         * to an empty function and deletes the corresponding key in the
         * _directMap dict.
         *
         * TODO: actually remove this from the _callbacks dictionary instead
         * of binding an empty function
         *
         * the keycombo+action has to be exactly the same as
         * it was defined in the bind method
         *
         * @param {string|Array} keys
         * @param {string} action
         * @returns void
         */
        unbind: function(keys, action) {
            return Mousetrap.bind(keys, function() {}, action);
        },

        /**
         * triggers an event that has already been bound
         *
         * @param {string} keys
         * @param {string=} action
         * @returns void
         */
        trigger: function(keys, action) {
            if (_directMap[keys + ':' + action]) {
                _directMap[keys + ':' + action]({}, keys);
            }
            return this;
        },

        /**
         * resets the library back to its initial state.  this is useful
         * if you want to clear out the current keyboard shortcuts and bind
         * new ones - for example if you switch to another page
         *
         * @returns void
         */
        reset: function() {
            _callbacks = {};
            _directMap = {};
            return this;
        },

       /**
        * should we stop this event before firing off callbacks
        *
        * @param {Event} e
        * @param {Element} element
        * @return {boolean}
        */
        stopCallback: function(e, element) {

            // if the element has the class "mousetrap" then no need to stop
            if ((' ' + element.className + ' ').indexOf(' mousetrap ') > -1) {
                return false;
            }

            // stop for input, select, and textarea
            return element.tagName == 'INPUT' || element.tagName == 'SELECT' || element.tagName == 'TEXTAREA' || element.isContentEditable;
        },

        /**
         * exposes _handleKey publicly so it can be overwritten by extensions
         */
        handleKey: _handleKey
    };

    // expose mousetrap to the global object
    window.Mousetrap = Mousetrap;

    // expose mousetrap as an AMD module
    if (typeof define === 'function' && define.amd) {
        define(Mousetrap);
    }
}) (window, document);