yjs/build/browser/index.js

(function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);throw new Error("Cannot find module '"+o+"'")}var f=n[o]={exports:{}};t[o][0].call(f.exports,function(e){var n=t[o][1][e];return s(n?n:e)},f,f.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
var createIwcConnector;

createIwcConnector = function(callback, initial_user_id) {
  var IwcConnector, duiClient, init, iwcHandler, received_HB;
  iwcHandler = {};
  duiClient = new DUIClient();
  duiClient.connect(function(intent) {
    var _ref;
    return (_ref = iwcHandler[intent.action]) != null ? _ref.map(function(f) {
      return setTimeout(function() {
        return f(intent);
      }, 0);
    }) : void 0;
  });
  duiClient.initOK();
  received_HB = null;
  IwcConnector = (function() {
    function IwcConnector(engine, HB, execution_listener, yatta) {
      var receiveHB, receive_, sendHistoryBuffer, send_;
      this.engine = engine;
      this.HB = HB;
      this.execution_listener = execution_listener;
      this.yatta = yatta;
      this.duiClient = duiClient;
      this.iwcHandler = iwcHandler;
      send_ = (function(_this) {
        return function(o) {
          if (Object.getOwnPropertyNames(_this.initialized).length !== 0) {
            return _this.send(o);
          }
        };
      })(this);
      this.execution_listener.push(send_);
      this.initialized = {};
      receiveHB = (function(_this) {
        return function(json) {
          var him;
          HB = json.extras.HB;
          him = json.extras.user;
          _this.engine.applyOpsCheckDouble(HB);
          return _this.initialized[him] = true;
        };
      })(this);
      iwcHandler["Yatta_push_HB_element"] = [receiveHB];
      this.sendIwcIntent("Yatta_get_HB_element", {});
      receive_ = (function(_this) {
        return function(intent) {
          var o;
          o = intent.extras;
          if (_this.initialized[o.uid.creator] != null) {
            return _this.receive(o);
          }
        };
      })(this);
      this.iwcHandler["Yatta_new_operation"] = [receive_];
      if (received_HB != null) {
        this.engine.applyOpsCheckDouble(received_HB);
      }
      sendHistoryBuffer = (function(_this) {
        return function() {
          var json;
          json = {
            HB: _this.yatta.getHistoryBuffer()._encode(),
            user: _this.yatta.getUserId()
          };
          return _this.sendIwcIntent("Yatta_push_HB_element", json);
        };
      })(this);
      this.iwcHandler["Yatta_get_HB_element"] = [sendHistoryBuffer];
    }

    IwcConnector.prototype.send = function(o) {
      if (o.uid.creator === this.HB.getUserId() && (typeof o.uid.op_number !== "string")) {
        return this.sendIwcIntent("Yatta_new_operation", o);
      }
    };

    IwcConnector.prototype.receive = function(o) {
      if (o.uid.creator !== this.HB.getUserId()) {
        return this.engine.applyOp(o);
      }
    };

    IwcConnector.prototype.sendIwcIntent = function(action_name, content) {
      var intent;
      intent = {
        action: action_name,
        component: "",
        data: "",
        dataType: "",
        flags: ["PUBLISH_GLOBAL"],
        extras: content
      };
      return this.duiClient.sendIntent(intent);
    };

    return IwcConnector;

  })();
  init = function() {
    var proposed_user_id;
    proposed_user_id = null;
    if (initial_user_id != null) {
      proposed_user_id = initial_user_id;
    } else {
      proposed_user_id = Math.floor(Math.random() * 1000000);
    }
    return callback(IwcConnector, proposed_user_id);
  };
  setTimeout(init, 5000);
  return void 0;
};

module.exports = createIwcConnector;

if (typeof window !== "undefined" && window !== null) {
  if (window.Y == null) {
    window.Y = {};
  }
  window.Y.createIwcConnector = createIwcConnector;
}


},{}],2:[function(require,module,exports){
var _;

_ = require("underscore");

module.exports = function(user_list) {
  var TestConnector;
  return TestConnector = (function() {
    function TestConnector(engine, HB, execution_listener) {
      var appliedOperationsListener, send_;
      this.engine = engine;
      this.HB = HB;
      this.execution_listener = execution_listener;
      send_ = (function(_this) {
        return function(o) {
          return _this.send(o);
        };
      })(this);
      this.execution_listener.push(send_);
      this.applied_operations = [];
      appliedOperationsListener = (function(_this) {
        return function(o) {
          return _this.applied_operations.push(o);
        };
      })(this);
      this.execution_listener.push(appliedOperationsListener);
      if (!((user_list != null ? user_list.length : void 0) === 0)) {
        this.engine.applyOps(user_list[0].getHistoryBuffer()._encode());
      }
      this.unexecuted = {};
    }

    TestConnector.prototype.getOpsInExecutionOrder = function() {
      return this.applied_operations;
    };

    TestConnector.prototype.send = function(o) {
      var user, _i, _len, _results;
      if ((o.uid.creator === this.HB.getUserId()) && (typeof o.uid.op_number !== "string")) {
        _results = [];
        for (_i = 0, _len = user_list.length; _i < _len; _i++) {
          user = user_list[_i];
          if (user.getUserId() !== this.HB.getUserId()) {
            _results.push(user.getConnector().receive(o));
          } else {
            _results.push(void 0);
          }
        }
        return _results;
      }
    };

    TestConnector.prototype.receive = function(o) {
      var _base, _name;
      if ((_base = this.unexecuted)[_name = o.uid.creator] == null) {
        _base[_name] = [];
      }
      return this.unexecuted[o.uid.creator].push(o);
    };

    TestConnector.prototype.flushOne = function(user) {
      var _ref;
      if (((_ref = this.unexecuted[user]) != null ? _ref.length : void 0) > 0) {
        return this.engine.applyOp(this.unexecuted[user].shift());
      }
    };

    TestConnector.prototype.flushOneRandom = function() {
      return this.flushOne(_.random(0, user_list.length - 1));
    };

    TestConnector.prototype.flushAll = function() {
      var n, ops, _ref;
      _ref = this.unexecuted;
      for (n in _ref) {
        ops = _ref[n];
        this.engine.applyOps(ops);
      }
      return this.unexecuted = {};
    };

    return TestConnector;

  })();
};


},{"underscore":12}],3:[function(require,module,exports){
var Engine;

Engine = (function() {
  function Engine(HB, parser) {
    this.HB = HB;
    this.parser = parser;
    this.unprocessed_ops = [];
  }

  Engine.prototype.parseOperation = function(json) {
    var typeParser;
    typeParser = this.parser[json.type];
    if (typeParser != null) {
      return typeParser(json);
    } else {
      throw new Error("You forgot to specify a parser for type " + json.type + ". The message is " + (JSON.stringify(json)) + ".");
    }
  };

  Engine.prototype.applyOpsBundle = function(ops_json) {
    var o, ops, _i, _j, _k, _len, _len1, _len2;
    ops = [];
    for (_i = 0, _len = ops_json.length; _i < _len; _i++) {
      o = ops_json[_i];
      ops.push(this.parseOperation(o));
    }
    for (_j = 0, _len1 = ops.length; _j < _len1; _j++) {
      o = ops[_j];
      this.HB.addOperation(o);
    }
    for (_k = 0, _len2 = ops.length; _k < _len2; _k++) {
      o = ops[_k];
      if (!o.execute()) {
        this.unprocessed_ops.push(o);
      }
    }
    return this.tryUnprocessed();
  };

  Engine.prototype.applyOpsCheckDouble = function(ops_json) {
    var o, _i, _len, _results;
    _results = [];
    for (_i = 0, _len = ops_json.length; _i < _len; _i++) {
      o = ops_json[_i];
      if (this.HB.getOperation(o.uid) == null) {
        _results.push(this.applyOp(o));
      } else {
        _results.push(void 0);
      }
    }
    return _results;
  };

  Engine.prototype.applyOps = function(ops_json) {
    var o, _i, _len, _results;
    _results = [];
    for (_i = 0, _len = ops_json.length; _i < _len; _i++) {
      o = ops_json[_i];
      _results.push(this.applyOp(o));
    }
    return _results;
  };

  Engine.prototype.applyOp = function(op_json) {
    var o;
    o = this.parseOperation(op_json);
    this.HB.addToCounter(o);
    if (!o.execute()) {
      this.unprocessed_ops.push(o);
    } else {
      this.HB.addOperation(o);
    }
    return this.tryUnprocessed();
  };

  Engine.prototype.tryUnprocessed = function() {
    var old_length, op, unprocessed, _i, _len, _ref, _results;
    _results = [];
    while (true) {
      old_length = this.unprocessed_ops.length;
      unprocessed = [];
      _ref = this.unprocessed_ops;
      for (_i = 0, _len = _ref.length; _i < _len; _i++) {
        op = _ref[_i];
        if (!op.execute()) {
          unprocessed.push(op);
        } else {
          this.HB.addOperation(op);
        }
      }
      this.unprocessed_ops = unprocessed;
      if (this.unprocessed_ops.length === old_length) {
        break;
      } else {
        _results.push(void 0);
      }
    }
    return _results;
  };

  return Engine;

})();

module.exports = Engine;


},{}],4:[function(require,module,exports){
var Engine, HistoryBuffer, JsonYatta, json_types_uninitialized;

json_types_uninitialized = require("../Types/JsonTypes");

HistoryBuffer = require("../HistoryBuffer");

Engine = require("../Engine");

JsonYatta = (function() {
  function JsonYatta(user_id, Connector) {
    var first_word, json_types;
    this.HB = new HistoryBuffer(user_id);
    json_types = json_types_uninitialized(this.HB);
    this.engine = new Engine(this.HB, json_types.parser);
    this.connector = new Connector(this.engine, this.HB, json_types.execution_listener, this);
    first_word = new json_types.types.JsonType(this.HB.getReservedUniqueIdentifier());
    this.HB.addOperation(first_word).execute();
    this.root_element = first_word;
  }

  JsonYatta.prototype.getRootElement = function() {
    return this.root_element;
  };

  JsonYatta.prototype.getEngine = function() {
    return this.engine;
  };

  JsonYatta.prototype.getConnector = function() {
    return this.connector;
  };

  JsonYatta.prototype.getHistoryBuffer = function() {
    return this.HB;
  };

  JsonYatta.prototype.setMutableDefault = function(mutable) {
    return this.root_element.setMutableDefault(mutable);
  };

  JsonYatta.prototype.getUserId = function() {
    return this.HB.getUserId();
  };

  JsonYatta.prototype.val = function(name, content, mutable) {
    return this.root_element.val(name, content, mutable);
  };

  Object.defineProperty(JsonYatta.prototype, 'value', {
    get: function() {
      return this.root_element.value;
    },
    set: function(o) {
      var o_name, o_obj, _results;
      if (o.constructor === {}.constructor) {
        _results = [];
        for (o_name in o) {
          o_obj = o[o_name];
          _results.push(this.val(o_name, o_obj, 'immutable'));
        }
        return _results;
      } else {
        throw new Error("You must only set Object values!");
      }
    }
  });

  return JsonYatta;

})();

module.exports = JsonYatta;

if (typeof window !== "undefined" && window !== null) {
  if (window.Y == null) {
    window.Y = {};
  }
  window.Y.JsonYatta = JsonYatta;
}


},{"../Engine":3,"../HistoryBuffer":6,"../Types/JsonTypes":8}],5:[function(require,module,exports){
var Engine, HistoryBuffer, TextYatta, text_types_uninitialized;

text_types_uninitialized = require("../Types/TextTypes");

HistoryBuffer = require("../HistoryBuffer");

Engine = require("../Engine");

TextYatta = (function() {
  function TextYatta(user_id, Connector) {
    var first_word, text_types;
    this.HB = new HistoryBuffer(user_id);
    text_types = text_types_uninitialized(this.HB);
    this.engine = new Engine(this.HB, text_types.parser);
    this.connector = new Connector(this.engine, this.HB, text_types.execution_listener);
    first_word = new text_types.types.Word(void 0);
    this.HB.addOperation(first_word).execute();
    this.root_element = first_word;
  }

  TextYatta.prototype.getRootElement = function() {
    return this.root_element;
  };

  TextYatta.prototype.getEngine = function() {
    return this.engine;
  };

  TextYatta.prototype.getConnector = function() {
    return this.connector;
  };

  TextYatta.prototype.getHistoryBuffer = function() {
    return this.HB;
  };

  TextYatta.prototype.getUserId = function() {
    return this.HB.getUserId();
  };

  TextYatta.prototype.val = function() {
    return this.root_element.val();
  };

  TextYatta.prototype.insertText = function(pos, content) {
    return this.root_element.insertText(pos, content);
  };

  TextYatta.prototype.deleteText = function(pos, length) {
    return this.root_element.deleteText(pos, length);
  };

  TextYatta.prototype.replaceText = function(text) {
    return this.root_element.replaceText(text);
  };

  return TextYatta;

})();

module.exports = TextYatta;

if (typeof window !== "undefined" && window !== null) {
  if (window.Y == null) {
    window.Y = {};
  }
  window.Y.TextYatta = TextYatta;
}


},{"../Engine":3,"../HistoryBuffer":6,"../Types/TextTypes":10}],6:[function(require,module,exports){
var HistoryBuffer;

HistoryBuffer = (function() {
  function HistoryBuffer(user_id) {
    this.user_id = user_id;
    this.operation_counter = {};
    this.buffer = {};
    this.change_listeners = [];
  }

  HistoryBuffer.prototype.getUserId = function() {
    return this.user_id;
  };

  HistoryBuffer.prototype.getReservedUniqueIdentifier = function() {
    return {
      creator: '_',
      op_number: '_'
    };
  };

  HistoryBuffer.prototype.getOperationCounter = function() {
    var ctn, res, user, _ref;
    res = {};
    _ref = this.operation_counter;
    for (user in _ref) {
      ctn = _ref[user];
      res[user] = ctn;
    }
    return res;
  };

  HistoryBuffer.prototype._encode = function(state_vector) {
    var json, o, o_json, o_next, o_number, o_prev, u_name, unknown, user, _ref;
    if (state_vector == null) {
      state_vector = {};
    }
    json = [];
    unknown = function(user, o_number) {
      if ((user == null) || (o_number == null)) {
        throw new Error("dah!");
      }
      return (state_vector[user] == null) || state_vector[user] <= o_number;
    };
    _ref = this.buffer;
    for (u_name in _ref) {
      user = _ref[u_name];
      for (o_number in user) {
        o = user[o_number];
        if ((!isNaN(parseInt(o_number))) && unknown(u_name, o_number)) {
          o_json = o._encode();
          if (o.next_cl != null) {
            o_next = o.next_cl;
            while ((o_next.next_cl != null) && unknown(o_next.creator, o_next.op_number)) {
              o_next = o_next.next_cl;
            }
            o_json.next = o_next.getUid();
          } else if (o.prev_cl != null) {
            o_prev = o.prev_cl;
            while ((o_prev.prev_cl != null) && unknown(o_next.creator, o_next.op_number)) {
              o_prev = o_prev.prev_cl;
            }
            o_json.prev = o_prev.getUid();
          }
          json.push(o_json);
        }
      }
    }
    return json;
  };

  HistoryBuffer.prototype.getNextOperationIdentifier = function(user_id) {
    var uid;
    if (user_id == null) {
      user_id = this.user_id;
    }
    if (this.operation_counter[user_id] == null) {
      this.operation_counter[user_id] = 0;
    }
    uid = {
      'creator': user_id,
      'op_number': this.operation_counter[user_id]
    };
    this.operation_counter[user_id]++;
    return uid;
  };

  HistoryBuffer.prototype.getOperation = function(uid) {
    var _ref;
    if (uid instanceof Object) {
      return (_ref = this.buffer[uid.creator]) != null ? _ref[uid.op_number] : void 0;
    } else if (uid == null) {

    } else {
      throw new Error("This type of uid is not defined!");
    }
  };

  HistoryBuffer.prototype.addOperation = function(o) {
    if (this.buffer[o.creator] == null) {
      this.buffer[o.creator] = {};
    }
    if (this.buffer[o.creator][o.op_number] != null) {
      throw new Error("You must not overwrite operations!");
    }
    this.buffer[o.creator][o.op_number] = o;
    return o;
  };

  HistoryBuffer.prototype.addToCounter = function(o) {
    if (this.operation_counter[o.creator] == null) {
      this.operation_counter[o.creator] = 0;
    }
    if (typeof o.op_number === 'number' && o.creator !== this.getUserId()) {
      return this.operation_counter[o.creator]++;
    }
  };

  return HistoryBuffer;

})();

module.exports = HistoryBuffer;


},{}],7:[function(require,module,exports){
var __hasProp = {}.hasOwnProperty,
  __extends = function(child, parent) { for (var key in parent) { if (__hasProp.call(parent, key)) child[key] = parent[key]; } function ctor() { this.constructor = child; } ctor.prototype = parent.prototype; child.prototype = new ctor(); child.__super__ = parent.prototype; return child; };

module.exports = function(HB) {
  var Delete, Delimiter, ImmutableObject, Insert, Operation, execution_listener, parser;
  parser = {};
  execution_listener = [];
  Operation = (function() {
    function Operation(uid) {
      if (uid == null) {
        uid = HB.getNextOperationIdentifier();
      }
      this.creator = uid['creator'], this.op_number = uid['op_number'];
    }

    Operation.prototype.on = function(event, f) {
      var _base;
      if (this.event_listeners == null) {
        this.event_listeners = {};
      }
      if ((_base = this.event_listeners)[event] == null) {
        _base[event] = [];
      }
      return this.event_listeners[event].push(f);
    };

    Operation.prototype.callEvent = function(event, args) {
      var f, _i, _len, _ref, _results;
      if (this.event_listeners[event] != null) {
        _ref = this.event_listeners[event];
        _results = [];
        for (_i = 0, _len = _ref.length; _i < _len; _i++) {
          f = _ref[_i];
          _results.push(f.call(this, event, args));
        }
        return _results;
      }
    };

    Operation.prototype.setParent = function(o) {
      return this.parent = o;
    };

    Operation.prototype.getUid = function() {
      return {
        'creator': this.creator,
        'op_number': this.op_number
      };
    };

    Operation.prototype.execute = function() {
      var l, _i, _len;
      this.is_executed = true;
      for (_i = 0, _len = execution_listener.length; _i < _len; _i++) {
        l = execution_listener[_i];
        l(this._encode());
      }
      return this;
    };

    Operation.prototype.saveOperation = function(name, op) {
      if ((op != null ? op.execute : void 0) != null) {
        return this[name] = op;
      } else if (op != null) {
        if (this.unchecked == null) {
          this.unchecked = {};
        }
        return this.unchecked[name] = op;
      }
    };

    Operation.prototype.validateSavedOperations = function() {
      var name, op, op_uid, success, uninstantiated, _ref;
      uninstantiated = {};
      success = this;
      _ref = this.unchecked;
      for (name in _ref) {
        op_uid = _ref[name];
        op = HB.getOperation(op_uid);
        if (op) {
          this[name] = op;
        } else {
          uninstantiated[name] = op_uid;
          success = false;
        }
      }
      delete this.unchecked;
      if (!success) {
        this.unchecked = uninstantiated;
      }
      return success;
    };

    return Operation;

  })();
  Delete = (function(_super) {
    __extends(Delete, _super);

    function Delete(uid, deletes) {
      this.saveOperation('deletes', deletes);
      Delete.__super__.constructor.call(this, uid);
    }

    Delete.prototype._encode = function() {
      return {
        'type': "Delete",
        'uid': this.getUid(),
        'deletes': this.deletes.getUid()
      };
    };

    Delete.prototype.execute = function() {
      if (this.validateSavedOperations()) {
        this.deletes.applyDelete(this);
        Delete.__super__.execute.apply(this, arguments);
        return this;
      } else {
        return false;
      }
    };

    return Delete;

  })(Operation);
  parser['Delete'] = function(o) {
    var deletes_uid, uid;
    uid = o['uid'], deletes_uid = o['deletes'];
    return new Delete(uid, deletes_uid);
  };
  Insert = (function(_super) {
    __extends(Insert, _super);

    function Insert(uid, prev_cl, next_cl, origin) {
      this.saveOperation('prev_cl', prev_cl);
      this.saveOperation('next_cl', next_cl);
      if (origin != null) {
        this.saveOperation('origin', origin);
      } else {
        this.saveOperation('origin', prev_cl);
      }
      Insert.__super__.constructor.call(this, uid);
    }

    Insert.prototype.applyDelete = function(o) {
      if (this.deleted_by == null) {
        this.deleted_by = [];
      }
      return this.deleted_by.push(o);
    };

    Insert.prototype.isDeleted = function() {
      var _ref;
      return ((_ref = this.deleted_by) != null ? _ref.length : void 0) > 0;
    };

    Insert.prototype.getDistanceToOrigin = function() {
      var d, o;
      d = 0;
      o = this.prev_cl;
      while (true) {
        if (this.origin === o) {
          break;
        }
        d++;
        if (this === this.prev_cl) {
          throw new Error("this should not happen ;) ");
        }
        o = o.prev_cl;
      }
      return d;
    };

    Insert.prototype.update_sl = function() {
      var o;
      o = this.prev_cl;
      ({
        update: function(dest_cl, dest_sl) {
          var _results;
          _results = [];
          while (true) {
            if (o.isDeleted()) {
              _results.push(o = o[dest_cl]);
            } else {
              this[dest_sl] = o;
              break;
            }
          }
          return _results;
        }
      });
      update("prev_cl", "prev_sl");
      return update("next_cl", "prev_sl");
    };

    Insert.prototype.execute = function() {
      var distance_to_origin, i, o, _ref, _ref1;
      if (this.is_executed != null) {
        return this;
      }
      if (!this.validateSavedOperations()) {
        return false;
      } else {
        if (((_ref = this.prev_cl) != null ? _ref.validateSavedOperations() : void 0) && ((_ref1 = this.next_cl) != null ? _ref1.validateSavedOperations() : void 0) && this.prev_cl.next_cl !== this) {
          distance_to_origin = 0;
          o = this.prev_cl.next_cl;
          i = 0;
          while (true) {
            if (o == null) {
              console.log(JSON.stringify(this.prev_cl.getUid()));
              console.log(JSON.stringify(this.next_cl.getUid()));
            }
            if (o !== this.next_cl) {
              if (o.getDistanceToOrigin() === i) {
                if (o.creator < this.creator) {
                  this.prev_cl = o;
                  distance_to_origin = i + 1;
                } else {

                }
              } else if (o.getDistanceToOrigin() < i) {
                if (i - distance_to_origin <= o.getDistanceToOrigin()) {
                  this.prev_cl = o;
                  distance_to_origin = i + 1;
                } else {

                }
              } else {
                break;
              }
              i++;
              o = o.next_cl;
            } else {
              break;
            }
          }
          this.next_cl = this.prev_cl.next_cl;
          this.prev_cl.next_cl = this;
          this.next_cl.prev_cl = this;
        }
        return Insert.__super__.execute.apply(this, arguments);
      }
    };

    return Insert;

  })(Operation);
  ImmutableObject = (function(_super) {
    __extends(ImmutableObject, _super);

    function ImmutableObject(uid, content, prev, next, origin) {
      this.content = content;
      ImmutableObject.__super__.constructor.call(this, uid, prev, next, origin);
    }

    ImmutableObject.prototype.val = function() {
      return this.content;
    };

    ImmutableObject.prototype._encode = function() {
      var json;
      json = {
        'type': "ImmutableObject",
        'uid': this.getUid(),
        'content': this.content
      };
      if (this.prev_cl != null) {
        json['prev'] = this.prev_cl.getUid();
      }
      if (this.next_cl != null) {
        json['next'] = this.next_cl.getUid();
      }
      if ((this.origin != null) && this.origin !== this.prev_cl) {
        json["origin"] = this.origin.getUid();
      }
      return json;
    };

    return ImmutableObject;

  })(Insert);
  parser['ImmutableObject'] = function(json) {
    var content, next, origin, prev, uid;
    uid = json['uid'], content = json['content'], prev = json['prev'], next = json['next'], origin = json['origin'];
    return new ImmutableObject(uid, content, prev, next, origin);
  };
  Delimiter = (function(_super) {
    __extends(Delimiter, _super);

    function Delimiter(uid, prev_cl, next_cl, origin) {
      this.saveOperation('prev_cl', prev_cl);
      this.saveOperation('next_cl', next_cl);
      this.saveOperation('origin', prev_cl);
      Delimiter.__super__.constructor.call(this, uid);
    }

    Delimiter.prototype.isDeleted = function() {
      return false;
    };

    Delimiter.prototype.execute = function() {
      var _ref, _ref1;
      if (((_ref = this.unchecked) != null ? _ref['next_cl'] : void 0) != null) {
        return Delimiter.__super__.execute.apply(this, arguments);
      } else if ((_ref1 = this.unchecked) != null ? _ref1['prev_cl'] : void 0) {
        if (this.validateSavedOperations()) {
          if (this.prev_cl.next_cl != null) {
            throw new Error("Probably duplicated operations");
          }
          this.prev_cl.next_cl = this;
          delete this.prev_cl.unchecked.next_cl;
          return Delimiter.__super__.execute.apply(this, arguments);
        } else {
          return false;
        }
      } else if ((this.prev_cl != null) && (this.prev_cl.next_cl == null)) {
        delete this.prev_cl.unchecked.next_cl;
        return this.prev_cl.next_cl = this;
      } else if ((this.prev_cl != null) || (this.next_cl != null)) {
        return Delimiter.__super__.execute.apply(this, arguments);
      } else {
        throw new Error("Delimiter is unsufficient defined!");
      }
    };

    Delimiter.prototype._encode = function() {
      var _ref, _ref1;
      return {
        'type': "Delimiter",
        'uid': this.getUid(),
        'prev': (_ref = this.prev_cl) != null ? _ref.getUid() : void 0,
        'next': (_ref1 = this.next_cl) != null ? _ref1.getUid() : void 0
      };
    };

    return Delimiter;

  })(Operation);
  parser['Delimiter'] = function(json) {
    var next, prev, uid;
    uid = json['uid'], prev = json['prev'], next = json['next'];
    return new Delimiter(uid, prev, next);
  };
  return {
    'types': {
      'Delete': Delete,
      'Insert': Insert,
      'Delimiter': Delimiter,
      'Operation': Operation,
      'ImmutableObject': ImmutableObject
    },
    'parser': parser,
    'execution_listener': execution_listener
  };
};


},{}],8:[function(require,module,exports){
var text_types_uninitialized,
  __hasProp = {}.hasOwnProperty,
  __extends = function(child, parent) { for (var key in parent) { if (__hasProp.call(parent, key)) child[key] = parent[key]; } function ctor() { this.constructor = child; } ctor.prototype = parent.prototype; child.prototype = new ctor(); child.__super__ = parent.prototype; return child; };

text_types_uninitialized = require("./TextTypes");

module.exports = function(HB) {
  var JsonType, createJsonWrapper, parser, text_types, types;
  text_types = text_types_uninitialized(HB);
  types = text_types.types;
  parser = text_types.parser;
  createJsonWrapper = function(_jsonType) {
    var JsonWrapper;
    JsonWrapper = (function() {
      function JsonWrapper(jsonType) {
        var name, obj, _fn, _ref;
        _ref = jsonType.map;
        _fn = function(name, obj) {
          return Object.defineProperty(JsonWrapper.prototype, name, {
            get: function() {
              var x;
              x = obj.val();
              if (x instanceof JsonType) {
                return createJsonWrapper(x);
              } else if (x instanceof types.ImmutableObject) {
                return x.val();
              } else {
                return x;
              }
            },
            set: function(o) {
              var o_name, o_obj, overwrite, _results;
              if (o.constructor === {}.constructor) {
                overwrite = jsonType.val(name);
                _results = [];
                for (o_name in o) {
                  o_obj = o[o_name];
                  _results.push(overwrite.val(o_name, o_obj, 'immutable'));
                }
                return _results;
              } else {
                return jsonType.val(name, o, 'immutable');
              }
            },
            enumerable: true,
            configurable: false
          });
        };
        for (name in _ref) {
          obj = _ref[name];
          _fn(name, obj);
        }
      }

      return JsonWrapper;

    })();
    return new JsonWrapper(_jsonType);
  };
  JsonType = (function(_super) {
    __extends(JsonType, _super);

    function JsonType(uid, initial_value, mutable) {
      var name, o;
      JsonType.__super__.constructor.call(this, uid);
      if (initial_value != null) {
        if (typeof initial_value !== "object") {
          throw new Error("The initial value of JsonTypes must be of type Object! (current type: " + (typeof initial_value) + ")");
        }
        for (name in initial_value) {
          o = initial_value[name];
          this.val(name, o, mutable);
        }
      }
    }

    JsonType.prototype.mutable_default = true;

    JsonType.prototype.setMutableDefault = function(mutable) {
      if (mutable === true || mutable === 'mutable') {
        JsonType.prototype.mutable_default = true;
      } else if (mutable === false || mutable === 'immutable') {
        JsonType.prototype.mutable_default = false;
      } else {
        throw new Error('Set mutable either "mutable" or "immutable"!');
      }
      return 'OK';
    };

    JsonType.prototype.val = function(name, content, mutable) {
      var json, o, o_name, obj, word;
      if (typeof name === 'object') {
        for (o_name in name) {
          o = name[o_name];
          this.val(o_name, o, content);
        }
        return this;
      } else if ((name != null) && (content != null)) {
        if (mutable != null) {
          if (mutable === true || mutable === 'mutable') {
            mutable = true;
          } else {
            mutable = false;
          }
        } else {
          mutable = this.mutable_default;
        }
        if (typeof content === 'function') {
          return this;
        } else if (((!mutable) || typeof content === 'number') && content.constructor !== Object) {
          obj = HB.addOperation(new types.ImmutableObject(void 0, content)).execute();
          return JsonType.__super__.val.call(this, name, obj);
        } else {
          if (typeof content === 'string') {
            word = HB.addOperation(new types.Word(void 0)).execute();
            word.insertText(0, content);
            return JsonType.__super__.val.call(this, name, word);
          } else if (content.constructor === Object) {
            json = HB.addOperation(new JsonType(void 0, content, mutable)).execute();
            return JsonType.__super__.val.call(this, name, json);
          } else {
            throw new Error("You must not set " + (typeof content) + "-types in collaborative Json-objects!");
          }
        }
      } else {
        return JsonType.__super__.val.call(this, name, content);
      }
    };

    Object.defineProperty(JsonType.prototype, 'value', {
      get: function() {
        return createJsonWrapper(this);
      },
      set: function(o) {
        var o_name, o_obj, _results;
        if (o.constructor === {}.constructor) {
          _results = [];
          for (o_name in o) {
            o_obj = o[o_name];
            _results.push(this.val(o_name, o_obj, 'immutable'));
          }
          return _results;
        } else {
          throw new Error("You must only set Object values!");
        }
      }
    });

    JsonType.prototype._encode = function() {
      return {
        'type': "JsonType",
        'uid': this.getUid()
      };
    };

    return JsonType;

  })(types.MapManager);
  parser['JsonType'] = function(json) {
    var uid;
    uid = json['uid'];
    return new JsonType(uid);
  };
  types['JsonType'] = JsonType;
  return text_types;
};


},{"./TextTypes":10}],9:[function(require,module,exports){
var basic_types_uninitialized,
  __hasProp = {}.hasOwnProperty,
  __extends = function(child, parent) { for (var key in parent) { if (__hasProp.call(parent, key)) child[key] = parent[key]; } function ctor() { this.constructor = child; } ctor.prototype = parent.prototype; child.prototype = new ctor(); child.__super__ = parent.prototype; return child; };

basic_types_uninitialized = require("./BasicTypes");

module.exports = function(HB) {
  var AddName, ListManager, MapManager, ReplaceManager, Replaceable, basic_types, parser, types;
  basic_types = basic_types_uninitialized(HB);
  types = basic_types.types;
  parser = basic_types.parser;
  MapManager = (function(_super) {
    __extends(MapManager, _super);

    function MapManager(uid) {
      this.map = {};
      MapManager.__super__.constructor.call(this, uid);
    }

    MapManager.prototype.val = function(name, content) {
      var o, obj, result, _ref, _ref1;
      if (content != null) {
        if (this.map[name] == null) {
          HB.addOperation(new AddName(void 0, this, name)).execute();
        }
        this.map[name].replace(content);
        return this;
      } else if (name != null) {
        obj = (_ref = this.map[name]) != null ? _ref.val() : void 0;
        if (obj instanceof types.ImmutableObject) {
          return obj.val();
        } else {
          return obj;
        }
      } else {
        result = {};
        _ref1 = this.map;
        for (name in _ref1) {
          o = _ref1[name];
          obj = o.val();
          if (obj instanceof types.ImmutableObject || obj instanceof MapManager) {
            obj = obj.val();
          }
          result[name] = obj;
        }
        return result;
      }
    };

    return MapManager;

  })(types.Operation);
  AddName = (function(_super) {
    __extends(AddName, _super);

    function AddName(uid, map_manager, name) {
      this.name = name;
      this.saveOperation('map_manager', map_manager);
      AddName.__super__.constructor.call(this, uid);
    }

    AddName.prototype.execute = function() {
      var beg, end, uid_beg, uid_end, uid_r;
      if (!this.validateSavedOperations()) {
        return false;
      } else {
        uid_r = this.map_manager.getUid();
        uid_r.op_number = "_" + uid_r.op_number + "_RM_" + this.name;
        if (HB.getOperation(uid_r) == null) {
          uid_beg = this.map_manager.getUid();
          uid_beg.op_number = "_" + uid_beg.op_number + "_RM_" + this.name + "_beginning";
          uid_end = this.map_manager.getUid();
          uid_end.op_number = "_" + uid_end.op_number + "_RM_" + this.name + "_end";
          beg = HB.addOperation(new types.Delimiter(uid_beg, void 0, uid_end)).execute();
          end = HB.addOperation(new types.Delimiter(uid_end, beg, void 0)).execute();
          this.map_manager.map[this.name] = HB.addOperation(new ReplaceManager(void 0, uid_r, beg, end)).execute();
        }
        return AddName.__super__.execute.apply(this, arguments);
      }
    };

    AddName.prototype._encode = function() {
      return {
        'type': "AddName",
        'uid': this.getUid(),
        'map_manager': this.map_manager.getUid(),
        'name': this.name
      };
    };

    return AddName;

  })(types.Operation);
  parser['AddName'] = function(json) {
    var map_manager, name, uid;
    map_manager = json['map_manager'], uid = json['uid'], name = json['name'];
    return new AddName(uid, map_manager, name);
  };
  ListManager = (function(_super) {
    __extends(ListManager, _super);

    function ListManager(uid, beginning, end, prev, next, origin) {
      if ((beginning != null) && (end != null)) {
        this.saveOperation('beginning', beginning);
        this.saveOperation('end', end);
      } else {
        this.beginning = HB.addOperation(new types.Delimiter(void 0, void 0, void 0));
        this.end = HB.addOperation(new types.Delimiter(void 0, this.beginning, void 0));
        this.beginning.next_cl = this.end;
        this.beginning.execute();
        this.end.execute();
      }
      ListManager.__super__.constructor.call(this, uid, prev, next, origin);
    }

    ListManager.prototype.getLastOperation = function() {
      return this.end.prev_cl;
    };

    ListManager.prototype.getFirstOperation = function() {
      return this.beginning.next_cl;
    };

    ListManager.prototype.toArray = function() {
      var o, result;
      o = this.beginning.next_cl;
      result = [];
      while (o !== this.end) {
        result.push(o);
        o = o.next_cl;
      }
      return result;
    };

    ListManager.prototype.getOperationByPosition = function(position) {
      var o;
      o = this.beginning.next_cl;
      if (position > 0) {
        while (true) {
          o = o.next_cl;
          if (!o.isDeleted()) {
            position -= 1;
          }
          if (position === 0) {
            break;
          }
          if (o instanceof types.Delimiter) {
            throw new Error("position parameter exceeded the length of the document!");
          }
        }
      }
      return o;
    };

    return ListManager;

  })(types.Insert);
  ReplaceManager = (function(_super) {
    __extends(ReplaceManager, _super);

    function ReplaceManager(initial_content, uid, beginning, end, prev, next, origin) {
      ReplaceManager.__super__.constructor.call(this, uid, beginning, end, prev, next, origin);
      if (initial_content != null) {
        this.replace(initial_content);
      }
    }

    ReplaceManager.prototype.replace = function(content) {
      var o, op;
      o = this.getLastOperation();
      op = new Replaceable(content, this, void 0, o, o.next_cl);
      return HB.addOperation(op).execute();
    };

    ReplaceManager.prototype.val = function() {
      var o;
      o = this.getLastOperation();
      if (o instanceof types.Delimiter) {
        throw new Error("dtrn");
      }
      return o.val();
    };

    ReplaceManager.prototype._encode = function() {
      var json;
      json = {
        'type': "ReplaceManager",
        'uid': this.getUid(),
        'beginning': this.beginning.getUid(),
        'end': this.end.getUid()
      };
      if ((this.prev_cl != null) && (this.next_cl != null)) {
        json['prev'] = this.prev_cl.getUid();
        json['next'] = this.next_cl.getUid();
      }
      if ((this.origin != null) && this.origin !== this.prev_cl) {
        json["origin"] = this.origin.getUid();
      }
      return json;
    };

    return ReplaceManager;

  })(ListManager);
  parser["ReplaceManager"] = function(json) {
    var beginning, content, end, next, origin, prev, uid;
    content = json['content'], uid = json['uid'], prev = json['prev'], next = json['next'], origin = json['origin'], beginning = json['beginning'], end = json['end'];
    return new ReplaceManager(content, uid, beginning, end, prev, next, origin);
  };
  Replaceable = (function(_super) {
    __extends(Replaceable, _super);

    function Replaceable(content, parent, uid, prev, next, origin) {
      this.saveOperation('content', content);
      this.saveOperation('parent', parent);
      if (!((prev != null) && (next != null) && (content != null))) {
        throw new Error("You must define content, prev, and next for Replaceable-types!");
      }
      Replaceable.__super__.constructor.call(this, uid, prev, next, origin);
    }

    Replaceable.prototype.val = function() {
      return this.content;
    };

    Replaceable.prototype.replace = function(content) {
      return this.parent.replace(content);
    };

    Replaceable.prototype.execute = function() {
      var _base;
      if (!this.validateSavedOperations()) {
        return false;
      } else {
        if (typeof (_base = this.content).setReplaceManager === "function") {
          _base.setReplaceManager(this.parent);
        }
        return Replaceable.__super__.execute.apply(this, arguments);
      }
    };

    Replaceable.prototype._encode = function() {
      var json;
      json = {
        'type': "Replaceable",
        'content': this.content.getUid(),
        'ReplaceManager': this.parent.getUid(),
        'prev': this.prev_cl.getUid(),
        'next': this.next_cl.getUid(),
        'uid': this.getUid()
      };
      if ((this.origin != null) && this.origin !== this.prev_cl) {
        json["origin"] = this.origin.getUid();
      }
      return json;
    };

    return Replaceable;

  })(types.Insert);
  parser["Replaceable"] = function(json) {
    var content, next, origin, parent, prev, uid;
    content = json['content'], parent = json['ReplaceManager'], uid = json['uid'], prev = json['prev'], next = json['next'], origin = json['origin'];
    return new Replaceable(content, parent, uid, prev, next, origin);
  };
  types['ListManager'] = ListManager;
  types['MapManager'] = MapManager;
  types['ReplaceManager'] = ReplaceManager;
  types['Replaceable'] = Replaceable;
  return basic_types;
};


},{"./BasicTypes":7}],10:[function(require,module,exports){
var structured_types_uninitialized,
  __hasProp = {}.hasOwnProperty,
  __extends = function(child, parent) { for (var key in parent) { if (__hasProp.call(parent, key)) child[key] = parent[key]; } function ctor() { this.constructor = child; } ctor.prototype = parent.prototype; child.prototype = new ctor(); child.__super__ = parent.prototype; return child; };

structured_types_uninitialized = require("./StructuredTypes");

module.exports = function(HB) {
  var TextDelete, TextInsert, Word, parser, structured_types, types;
  structured_types = structured_types_uninitialized(HB);
  types = structured_types.types;
  parser = structured_types.parser;
  TextDelete = (function(_super) {
    __extends(TextDelete, _super);

    function TextDelete() {
      return TextDelete.__super__.constructor.apply(this, arguments);
    }

    return TextDelete;

  })(types.Delete);
  parser["TextDelete"] = parser["Delete"];
  TextInsert = (function(_super) {
    __extends(TextInsert, _super);

    function TextInsert(content, uid, prev, next, origin) {
      this.content = content;
      if (!((prev != null) && (next != null))) {
        throw new Error("You must define prev, and next for TextInsert-types!");
      }
      TextInsert.__super__.constructor.call(this, uid, prev, next, origin);
    }

    TextInsert.prototype.getLength = function() {
      if (this.isDeleted()) {
        return 0;
      } else {
        return this.content.length;
      }
    };

    TextInsert.prototype.val = function(current_position) {
      if (this.isDeleted()) {
        return "";
      } else {
        return this.content;
      }
    };

    TextInsert.prototype._encode = function() {
      var json;
      json = {
        'type': "TextInsert",
        'content': this.content,
        'uid': this.getUid(),
        'prev': this.prev_cl.getUid(),
        'next': this.next_cl.getUid()
      };
      if ((this.origin != null) && this.origin !== this.prev_cl) {
        json["origin"] = this.origin.getUid();
      }
      return json;
    };

    return TextInsert;

  })(types.Insert);
  parser["TextInsert"] = function(json) {
    var content, next, origin, prev, uid;
    content = json['content'], uid = json['uid'], prev = json['prev'], next = json['next'], origin = json['origin'];
    return new TextInsert(content, uid, prev, next, origin);
  };
  Word = (function(_super) {
    __extends(Word, _super);

    function Word(uid, beginning, end, prev, next, origin) {
      Word.__super__.constructor.call(this, uid, beginning, end, prev, next, origin);
    }

    Word.prototype.insertText = function(position, content) {
      var c, o, op, _i, _len, _results;
      o = this.getOperationByPosition(position);
      _results = [];
      for (_i = 0, _len = content.length; _i < _len; _i++) {
        c = content[_i];
        op = new TextInsert(c, void 0, o.prev_cl, o);
        _results.push(HB.addOperation(op).execute());
      }
      return _results;
    };

    Word.prototype.deleteText = function(position, length) {
      var d, i, o, _i, _results;
      o = this.getOperationByPosition(position);
      _results = [];
      for (i = _i = 0; 0 <= length ? _i < length : _i > length; i = 0 <= length ? ++_i : --_i) {
        d = HB.addOperation(new TextDelete(void 0, o)).execute();
        o = o.next_cl;
        while (o.isDeleted()) {
          if (o instanceof types.Delimiter) {
            throw new Error("You can't delete more than there is..");
          }
          o = o.next_cl;
        }
        _results.push(d._encode());
      }
      return _results;
    };

    Word.prototype.replaceText = function(text) {
      var word;
      if (this.replace_manager != null) {
        word = HB.addOperation(new Word(void 0)).execute();
        word.insertText(0, text);
        return this.replace_manager.replace(word);
      } else {
        throw new Error("This type is currently not maintained by a ReplaceManager!");
      }
    };

    Word.prototype.val = function() {
      var c, o;
      c = (function() {
        var _i, _len, _ref, _results;
        _ref = this.toArray();
        _results = [];
        for (_i = 0, _len = _ref.length; _i < _len; _i++) {
          o = _ref[_i];
          if (o.val != null) {
            _results.push(o.val());
          } else {
            _results.push("");
          }
        }
        return _results;
      }).call(this);
      return c.join('');
    };

    Word.prototype.setReplaceManager = function(op) {
      this.saveOperation('replace_manager', op);
      return this.validateSavedOperations;
    };

    Word.prototype._encode = function() {
      var json;
      json = {
        'type': "Word",
        'uid': this.getUid(),
        'beginning': this.beginning.getUid(),
        'end': this.end.getUid()
      };
      if (this.prev_cl != null) {
        json['prev'] = this.prev_cl.getUid();
      }
      if (this.next_cl != null) {
        json['next'] = this.next_cl.getUid();
      }
      if ((this.origin != null) && this.origin !== this.prev_cl) {
        json["origin"] = this.origin.getUid();
      }
      return json;
    };

    return Word;

  })(types.ListManager);
  parser['Word'] = function(json) {
    var beginning, end, next, origin, prev, uid;
    uid = json['uid'], beginning = json['beginning'], end = json['end'], prev = json['prev'], next = json['next'], origin = json['origin'];
    return new Word(uid, beginning, end, prev, next, origin);
  };
  types['TextInsert'] = TextInsert;
  types['TextDelete'] = TextDelete;
  types['Word'] = Word;
  return structured_types;
};


},{"./StructuredTypes":9}],11:[function(require,module,exports){
exports['IwcConnector'] = require('./Connectors/IwcConnector');

exports['TestConnector'] = require('./Connectors/TestConnector');

exports['JsonYatta'] = require('./Frameworks/JsonYatta');

exports['TextYatta'] = require('./Frameworks/TextYatta');


},{"./Connectors/IwcConnector":1,"./Connectors/TestConnector":2,"./Frameworks/JsonYatta":4,"./Frameworks/TextYatta":5}],12:[function(require,module,exports){
//     Underscore.js 1.6.0
//     http://underscorejs.org
//     (c) 2009-2014 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
//     Underscore may be freely distributed under the MIT license.

(function() {

  // Baseline setup
  // --------------

  // Establish the root object, `window` in the browser, or `exports` on the server.
  var root = this;

  // Save the previous value of the `_` variable.
  var previousUnderscore = root._;

  // Establish the object that gets returned to break out of a loop iteration.
  var breaker = {};

  // Save bytes in the minified (but not gzipped) version:
  var ArrayProto = Array.prototype, ObjProto = Object.prototype, FuncProto = Function.prototype;

  // Create quick reference variables for speed access to core prototypes.
  var
    push             = ArrayProto.push,
    slice            = ArrayProto.slice,
    concat           = ArrayProto.concat,
    toString         = ObjProto.toString,
    hasOwnProperty   = ObjProto.hasOwnProperty;

  // All **ECMAScript 5** native function implementations that we hope to use
  // are declared here.
  var
    nativeForEach      = ArrayProto.forEach,
    nativeMap          = ArrayProto.map,
    nativeReduce       = ArrayProto.reduce,
    nativeReduceRight  = ArrayProto.reduceRight,
    nativeFilter       = ArrayProto.filter,
    nativeEvery        = ArrayProto.every,
    nativeSome         = ArrayProto.some,
    nativeIndexOf      = ArrayProto.indexOf,
    nativeLastIndexOf  = ArrayProto.lastIndexOf,
    nativeIsArray      = Array.isArray,
    nativeKeys         = Object.keys,
    nativeBind         = FuncProto.bind;

  // Create a safe reference to the Underscore object for use below.
  var _ = function(obj) {
    if (obj instanceof _) return obj;
    if (!(this instanceof _)) return new _(obj);
    this._wrapped = obj;
  };

  // Export the Underscore object for **Node.js**, with
  // backwards-compatibility for the old `require()` API. If we're in
  // the browser, add `_` as a global object via a string identifier,
  // for Closure Compiler "advanced" mode.
  if (typeof exports !== 'undefined') {
    if (typeof module !== 'undefined' && module.exports) {
      exports = module.exports = _;
    }
    exports._ = _;
  } else {
    root._ = _;
  }

  // Current version.
  _.VERSION = '1.6.0';

  // Collection Functions
  // --------------------

  // The cornerstone, an `each` implementation, aka `forEach`.
  // Handles objects with the built-in `forEach`, arrays, and raw objects.
  // Delegates to **ECMAScript 5**'s native `forEach` if available.
  var each = _.each = _.forEach = function(obj, iterator, context) {
    if (obj == null) return obj;
    if (nativeForEach && obj.forEach === nativeForEach) {
      obj.forEach(iterator, context);
    } else if (obj.length === +obj.length) {
      for (var i = 0, length = obj.length; i < length; i++) {
        if (iterator.call(context, obj[i], i, obj) === breaker) return;
      }
    } else {
      var keys = _.keys(obj);
      for (var i = 0, length = keys.length; i < length; i++) {
        if (iterator.call(context, obj[keys[i]], keys[i], obj) === breaker) return;
      }
    }
    return obj;
  };

  // Return the results of applying the iterator to each element.
  // Delegates to **ECMAScript 5**'s native `map` if available.
  _.map = _.collect = function(obj, iterator, context) {
    var results = [];
    if (obj == null) return results;
    if (nativeMap && obj.map === nativeMap) return obj.map(iterator, context);
    each(obj, function(value, index, list) {
      results.push(iterator.call(context, value, index, list));
    });
    return results;
  };

  var reduceError = 'Reduce of empty array with no initial value';

  // **Reduce** builds up a single result from a list of values, aka `inject`,
  // or `foldl`. Delegates to **ECMAScript 5**'s native `reduce` if available.
  _.reduce = _.foldl = _.inject = function(obj, iterator, memo, context) {
    var initial = arguments.length > 2;
    if (obj == null) obj = [];
    if (nativeReduce && obj.reduce === nativeReduce) {
      if (context) iterator = _.bind(iterator, context);
      return initial ? obj.reduce(iterator, memo) : obj.reduce(iterator);
    }
    each(obj, function(value, index, list) {
      if (!initial) {
        memo = value;
        initial = true;
      } else {
        memo = iterator.call(context, memo, value, index, list);
      }
    });
    if (!initial) throw new TypeError(reduceError);
    return memo;
  };

  // The right-associative version of reduce, also known as `foldr`.
  // Delegates to **ECMAScript 5**'s native `reduceRight` if available.
  _.reduceRight = _.foldr = function(obj, iterator, memo, context) {
    var initial = arguments.length > 2;
    if (obj == null) obj = [];
    if (nativeReduceRight && obj.reduceRight === nativeReduceRight) {
      if (context) iterator = _.bind(iterator, context);
      return initial ? obj.reduceRight(iterator, memo) : obj.reduceRight(iterator);
    }
    var length = obj.length;
    if (length !== +length) {
      var keys = _.keys(obj);
      length = keys.length;
    }
    each(obj, function(value, index, list) {
      index = keys ? keys[--length] : --length;
      if (!initial) {
        memo = obj[index];
        initial = true;
      } else {
        memo = iterator.call(context, memo, obj[index], index, list);
      }
    });
    if (!initial) throw new TypeError(reduceError);
    return memo;
  };

  // Return the first value which passes a truth test. Aliased as `detect`.
  _.find = _.detect = function(obj, predicate, context) {
    var result;
    any(obj, function(value, index, list) {
      if (predicate.call(context, value, index, list)) {
        result = value;
        return true;
      }
    });
    return result;
  };

  // Return all the elements that pass a truth test.
  // Delegates to **ECMAScript 5**'s native `filter` if available.
  // Aliased as `select`.
  _.filter = _.select = function(obj, predicate, context) {
    var results = [];
    if (obj == null) return results;
    if (nativeFilter && obj.filter === nativeFilter) return obj.filter(predicate, context);
    each(obj, function(value, index, list) {
      if (predicate.call(context, value, index, list)) results.push(value);
    });
    return results;
  };

  // Return all the elements for which a truth test fails.
  _.reject = function(obj, predicate, context) {
    return _.filter(obj, function(value, index, list) {
      return !predicate.call(context, value, index, list);
    }, context);
  };

  // Determine whether all of the elements match a truth test.
  // Delegates to **ECMAScript 5**'s native `every` if available.
  // Aliased as `all`.
  _.every = _.all = function(obj, predicate, context) {
    predicate || (predicate = _.identity);
    var result = true;
    if (obj == null) return result;
    if (nativeEvery && obj.every === nativeEvery) return obj.every(predicate, context);
    each(obj, function(value, index, list) {
      if (!(result = result && predicate.call(context, value, index, list))) return breaker;
    });
    return !!result;
  };

  // Determine if at least one element in the object matches a truth test.
  // Delegates to **ECMAScript 5**'s native `some` if available.
  // Aliased as `any`.
  var any = _.some = _.any = function(obj, predicate, context) {
    predicate || (predicate = _.identity);
    var result = false;
    if (obj == null) return result;
    if (nativeSome && obj.some === nativeSome) return obj.some(predicate, context);
    each(obj, function(value, index, list) {
      if (result || (result = predicate.call(context, value, index, list))) return breaker;
    });
    return !!result;
  };

  // Determine if the array or object contains a given value (using `===`).
  // Aliased as `include`.
  _.contains = _.include = function(obj, target) {
    if (obj == null) return false;
    if (nativeIndexOf && obj.indexOf === nativeIndexOf) return obj.indexOf(target) != -1;
    return any(obj, function(value) {
      return value === target;
    });
  };

  // Invoke a method (with arguments) on every item in a collection.
  _.invoke = function(obj, method) {
    var args = slice.call(arguments, 2);
    var isFunc = _.isFunction(method);
    return _.map(obj, function(value) {
      return (isFunc ? method : value[method]).apply(value, args);
    });
  };

  // Convenience version of a common use case of `map`: fetching a property.
  _.pluck = function(obj, key) {
    return _.map(obj, _.property(key));
  };

  // Convenience version of a common use case of `filter`: selecting only objects
  // containing specific `key:value` pairs.
  _.where = function(obj, attrs) {
    return _.filter(obj, _.matches(attrs));
  };

  // Convenience version of a common use case of `find`: getting the first object
  // containing specific `key:value` pairs.
  _.findWhere = function(obj, attrs) {
    return _.find(obj, _.matches(attrs));
  };

  // Return the maximum element or (element-based computation).
  // Can't optimize arrays of integers longer than 65,535 elements.
  // See [WebKit Bug 80797](https://bugs.webkit.org/show_bug.cgi?id=80797)
  _.max = function(obj, iterator, context) {
    if (!iterator && _.isArray(obj) && obj[0] === +obj[0] && obj.length < 65535) {
      return Math.max.apply(Math, obj);
    }
    var result = -Infinity, lastComputed = -Infinity;
    each(obj, function(value, index, list) {
      var computed = iterator ? iterator.call(context, value, index, list) : value;
      if (computed > lastComputed) {
        result = value;
        lastComputed = computed;
      }
    });
    return result;
  };

  // Return the minimum element (or element-based computation).
  _.min = function(obj, iterator, context) {
    if (!iterator && _.isArray(obj) && obj[0] === +obj[0] && obj.length < 65535) {
      return Math.min.apply(Math, obj);
    }
    var result = Infinity, lastComputed = Infinity;
    each(obj, function(value, index, list) {
      var computed = iterator ? iterator.call(context, value, index, list) : value;
      if (computed < lastComputed) {
        result = value;
        lastComputed = computed;
      }
    });
    return result;
  };

  // Shuffle an array, using the modern version of the
  // [Fisher-Yates shuffle](http://en.wikipedia.org/wiki/Fisher–Yates_shuffle).
  _.shuffle = function(obj) {
    var rand;
    var index = 0;
    var shuffled = [];
    each(obj, function(value) {
      rand = _.random(index++);
      shuffled[index - 1] = shuffled[rand];
      shuffled[rand] = value;
    });
    return shuffled;
  };

  // Sample **n** random values from a collection.
  // If **n** is not specified, returns a single random element.
  // The internal `guard` argument allows it to work with `map`.
  _.sample = function(obj, n, guard) {
    if (n == null || guard) {
      if (obj.length !== +obj.length) obj = _.values(obj);
      return obj[_.random(obj.length - 1)];
    }
    return _.shuffle(obj).slice(0, Math.max(0, n));
  };

  // An internal function to generate lookup iterators.
  var lookupIterator = function(value) {
    if (value == null) return _.identity;
    if (_.isFunction(value)) return value;
    return _.property(value);
  };

  // Sort the object's values by a criterion produced by an iterator.
  _.sortBy = function(obj, iterator, context) {
    iterator = lookupIterator(iterator);
    return _.pluck(_.map(obj, function(value, index, list) {
      return {
        value: value,
        index: index,
        criteria: iterator.call(context, value, index, list)
      };
    }).sort(function(left, right) {
      var a = left.criteria;
      var b = right.criteria;
      if (a !== b) {
        if (a > b || a === void 0) return 1;
        if (a < b || b === void 0) return -1;
      }
      return left.index - right.index;
    }), 'value');
  };

  // An internal function used for aggregate "group by" operations.
  var group = function(behavior) {
    return function(obj, iterator, context) {
      var result = {};
      iterator = lookupIterator(iterator);
      each(obj, function(value, index) {
        var key = iterator.call(context, value, index, obj);
        behavior(result, key, value);
      });
      return result;
    };
  };

  // Groups the object's values by a criterion. Pass either a string attribute
  // to group by, or a function that returns the criterion.
  _.groupBy = group(function(result, key, value) {
    _.has(result, key) ? result[key].push(value) : result[key] = [value];
  });

  // Indexes the object's values by a criterion, similar to `groupBy`, but for
  // when you know that your index values will be unique.
  _.indexBy = group(function(result, key, value) {
    result[key] = value;
  });

  // Counts instances of an object that group by a certain criterion. Pass
  // either a string attribute to count by, or a function that returns the
  // criterion.
  _.countBy = group(function(result, key) {
    _.has(result, key) ? result[key]++ : result[key] = 1;
  });

  // Use a comparator function to figure out the smallest index at which
  // an object should be inserted so as to maintain order. Uses binary search.
  _.sortedIndex = function(array, obj, iterator, context) {
    iterator = lookupIterator(iterator);
    var value = iterator.call(context, obj);
    var low = 0, high = array.length;
    while (low < high) {
      var mid = (low + high) >>> 1;
      iterator.call(context, array[mid]) < value ? low = mid + 1 : high = mid;
    }
    return low;
  };

  // Safely create a real, live array from anything iterable.
  _.toArray = function(obj) {
    if (!obj) return [];
    if (_.isArray(obj)) return slice.call(obj);
    if (obj.length === +obj.length) return _.map(obj, _.identity);
    return _.values(obj);
  };

  // Return the number of elements in an object.
  _.size = function(obj) {
    if (obj == null) return 0;
    return (obj.length === +obj.length) ? obj.length : _.keys(obj).length;
  };

  // Array Functions
  // ---------------

  // Get the first element of an array. Passing **n** will return the first N
  // values in the array. Aliased as `head` and `take`. The **guard** check
  // allows it to work with `_.map`.
  _.first = _.head = _.take = function(array, n, guard) {
    if (array == null) return void 0;
    if ((n == null) || guard) return array[0];
    if (n < 0) return [];
    return slice.call(array, 0, n);
  };

  // Returns everything but the last entry of the array. Especially useful on
  // the arguments object. Passing **n** will return all the values in
  // the array, excluding the last N. The **guard** check allows it to work with
  // `_.map`.
  _.initial = function(array, n, guard) {
    return slice.call(array, 0, array.length - ((n == null) || guard ? 1 : n));
  };

  // Get the last element of an array. Passing **n** will return the last N
  // values in the array. The **guard** check allows it to work with `_.map`.
  _.last = function(array, n, guard) {
    if (array == null) return void 0;
    if ((n == null) || guard) return array[array.length - 1];
    return slice.call(array, Math.max(array.length - n, 0));
  };

  // Returns everything but the first entry of the array. Aliased as `tail` and `drop`.
  // Especially useful on the arguments object. Passing an **n** will return
  // the rest N values in the array. The **guard**
  // check allows it to work with `_.map`.
  _.rest = _.tail = _.drop = function(array, n, guard) {
    return slice.call(array, (n == null) || guard ? 1 : n);
  };

  // Trim out all falsy values from an array.
  _.compact = function(array) {
    return _.filter(array, _.identity);
  };

  // Internal implementation of a recursive `flatten` function.
  var flatten = function(input, shallow, output) {
    if (shallow && _.every(input, _.isArray)) {
      return concat.apply(output, input);
    }
    each(input, function(value) {
      if (_.isArray(value) || _.isArguments(value)) {
        shallow ? push.apply(output, value) : flatten(value, shallow, output);
      } else {
        output.push(value);
      }
    });
    return output;
  };

  // Flatten out an array, either recursively (by default), or just one level.
  _.flatten = function(array, shallow) {
    return flatten(array, shallow, []);
  };

  // Return a version of the array that does not contain the specified value(s).
  _.without = function(array) {
    return _.difference(array, slice.call(arguments, 1));
  };

  // Split an array into two arrays: one whose elements all satisfy the given
  // predicate, and one whose elements all do not satisfy the predicate.
  _.partition = function(array, predicate) {
    var pass = [], fail = [];
    each(array, function(elem) {
      (predicate(elem) ? pass : fail).push(elem);
    });
    return [pass, fail];
  };

  // Produce a duplicate-free version of the array. If the array has already
  // been sorted, you have the option of using a faster algorithm.
  // Aliased as `unique`.
  _.uniq = _.unique = function(array, isSorted, iterator, context) {
    if (_.isFunction(isSorted)) {
      context = iterator;
      iterator = isSorted;
      isSorted = false;
    }
    var initial = iterator ? _.map(array, iterator, context) : array;
    var results = [];
    var seen = [];
    each(initial, function(value, index) {
      if (isSorted ? (!index || seen[seen.length - 1] !== value) : !_.contains(seen, value)) {
        seen.push(value);
        results.push(array[index]);
      }
    });
    return results;
  };

  // Produce an array that contains the union: each distinct element from all of
  // the passed-in arrays.
  _.union = function() {
    return _.uniq(_.flatten(arguments, true));
  };

  // Produce an array that contains every item shared between all the
  // passed-in arrays.
  _.intersection = function(array) {
    var rest = slice.call(arguments, 1);
    return _.filter(_.uniq(array), function(item) {
      return _.every(rest, function(other) {
        return _.contains(other, item);
      });
    });
  };

  // Take the difference between one array and a number of other arrays.
  // Only the elements present in just the first array will remain.
  _.difference = function(array) {
    var rest = concat.apply(ArrayProto, slice.call(arguments, 1));
    return _.filter(array, function(value){ return !_.contains(rest, value); });
  };

  // Zip together multiple lists into a single array -- elements that share
  // an index go together.
  _.zip = function() {
    var length = _.max(_.pluck(arguments, 'length').concat(0));
    var results = new Array(length);
    for (var i = 0; i < length; i++) {
      results[i] = _.pluck(arguments, '' + i);
    }
    return results;
  };

  // Converts lists into objects. Pass either a single array of `[key, value]`
  // pairs, or two parallel arrays of the same length -- one of keys, and one of
  // the corresponding values.
  _.object = function(list, values) {
    if (list == null) return {};
    var result = {};
    for (var i = 0, length = list.length; i < length; i++) {
      if (values) {
        result[list[i]] = values[i];
      } else {
        result[list[i][0]] = list[i][1];
      }
    }
    return result;
  };

  // If the browser doesn't supply us with indexOf (I'm looking at you, **MSIE**),
  // we need this function. Return the position of the first occurrence of an
  // item in an array, or -1 if the item is not included in the array.
  // Delegates to **ECMAScript 5**'s native `indexOf` if available.
  // If the array is large and already in sort order, pass `true`
  // for **isSorted** to use binary search.
  _.indexOf = function(array, item, isSorted) {
    if (array == null) return -1;
    var i = 0, length = array.length;
    if (isSorted) {
      if (typeof isSorted == 'number') {
        i = (isSorted < 0 ? Math.max(0, length + isSorted) : isSorted);
      } else {
        i = _.sortedIndex(array, item);
        return array[i] === item ? i : -1;
      }
    }
    if (nativeIndexOf && array.indexOf === nativeIndexOf) return array.indexOf(item, isSorted);
    for (; i < length; i++) if (array[i] === item) return i;
    return -1;
  };

  // Delegates to **ECMAScript 5**'s native `lastIndexOf` if available.
  _.lastIndexOf = function(array, item, from) {
    if (array == null) return -1;
    var hasIndex = from != null;
    if (nativeLastIndexOf && array.lastIndexOf === nativeLastIndexOf) {
      return hasIndex ? array.lastIndexOf(item, from) : array.lastIndexOf(item);
    }
    var i = (hasIndex ? from : array.length);
    while (i--) if (array[i] === item) return i;
    return -1;
  };

  // Generate an integer Array containing an arithmetic progression. A port of
  // the native Python `range()` function. See
  // [the Python documentation](http://docs.python.org/library/functions.html#range).
  _.range = function(start, stop, step) {
    if (arguments.length <= 1) {
      stop = start || 0;
      start = 0;
    }
    step = arguments[2] || 1;

    var length = Math.max(Math.ceil((stop - start) / step), 0);
    var idx = 0;
    var range = new Array(length);

    while(idx < length) {
      range[idx++] = start;
      start += step;
    }

    return range;
  };

  // Function (ahem) Functions
  // ------------------

  // Reusable constructor function for prototype setting.
  var ctor = function(){};

  // Create a function bound to a given object (assigning `this`, and arguments,
  // optionally). Delegates to **ECMAScript 5**'s native `Function.bind` if
  // available.
  _.bind = function(func, context) {
    var args, bound;
    if (nativeBind && func.bind === nativeBind) return nativeBind.apply(func, slice.call(arguments, 1));
    if (!_.isFunction(func)) throw new TypeError;
    args = slice.call(arguments, 2);
    return bound = function() {
      if (!(this instanceof bound)) return func.apply(context, args.concat(slice.call(arguments)));
      ctor.prototype = func.prototype;
      var self = new ctor;
      ctor.prototype = null;
      var result = func.apply(self, args.concat(slice.call(arguments)));
      if (Object(result) === result) return result;
      return self;
    };
  };

  // Partially apply a function by creating a version that has had some of its
  // arguments pre-filled, without changing its dynamic `this` context. _ acts
  // as a placeholder, allowing any combination of arguments to be pre-filled.
  _.partial = function(func) {
    var boundArgs = slice.call(arguments, 1);
    return function() {
      var position = 0;
      var args = boundArgs.slice();
      for (var i = 0, length = args.length; i < length; i++) {
        if (args[i] === _) args[i] = arguments[position++];
      }
      while (position < arguments.length) args.push(arguments[position++]);
      return func.apply(this, args);
    };
  };

  // Bind a number of an object's methods to that object. Remaining arguments
  // are the method names to be bound. Useful for ensuring that all callbacks
  // defined on an object belong to it.
  _.bindAll = function(obj) {
    var funcs = slice.call(arguments, 1);
    if (funcs.length === 0) throw new Error('bindAll must be passed function names');
    each(funcs, function(f) { obj[f] = _.bind(obj[f], obj); });
    return obj;
  };

  // Memoize an expensive function by storing its results.
  _.memoize = function(func, hasher) {
    var memo = {};
    hasher || (hasher = _.identity);
    return function() {
      var key = hasher.apply(this, arguments);
      return _.has(memo, key) ? memo[key] : (memo[key] = func.apply(this, arguments));
    };
  };

  // Delays a function for the given number of milliseconds, and then calls
  // it with the arguments supplied.
  _.delay = function(func, wait) {
    var args = slice.call(arguments, 2);
    return setTimeout(function(){ return func.apply(null, args); }, wait);
  };

  // Defers a function, scheduling it to run after the current call stack has
  // cleared.
  _.defer = function(func) {
    return _.delay.apply(_, [func, 1].concat(slice.call(arguments, 1)));
  };

  // Returns a function, that, when invoked, will only be triggered at most once
  // during a given window of time. Normally, the throttled function will run
  // as much as it can, without ever going more than once per `wait` duration;
  // but if you'd like to disable the execution on the leading edge, pass
  // `{leading: false}`. To disable execution on the trailing edge, ditto.
  _.throttle = function(func, wait, options) {
    var context, args, result;
    var timeout = null;
    var previous = 0;
    options || (options = {});
    var later = function() {
      previous = options.leading === false ? 0 : _.now();
      timeout = null;
      result = func.apply(context, args);
      context = args = null;
    };
    return function() {
      var now = _.now();
      if (!previous && options.leading === false) previous = now;
      var remaining = wait - (now - previous);
      context = this;
      args = arguments;
      if (remaining <= 0) {
        clearTimeout(timeout);
        timeout = null;
        previous = now;
        result = func.apply(context, args);
        context = args = null;
      } else if (!timeout && options.trailing !== false) {
        timeout = setTimeout(later, remaining);
      }
      return result;
    };
  };

  // Returns a function, that, as long as it continues to be invoked, will not
  // be triggered. The function will be called after it stops being called for
  // N milliseconds. If `immediate` is passed, trigger the function on the
  // leading edge, instead of the trailing.
  _.debounce = function(func, wait, immediate) {
    var timeout, args, context, timestamp, result;

    var later = function() {
      var last = _.now() - timestamp;
      if (last < wait) {
        timeout = setTimeout(later, wait - last);
      } else {
        timeout = null;
        if (!immediate) {
          result = func.apply(context, args);
          context = args = null;
        }
      }
    };

    return function() {
      context = this;
      args = arguments;
      timestamp = _.now();
      var callNow = immediate && !timeout;
      if (!timeout) {
        timeout = setTimeout(later, wait);
      }
      if (callNow) {
        result = func.apply(context, args);
        context = args = null;
      }

      return result;
    };
  };

  // Returns a function that will be executed at most one time, no matter how
  // often you call it. Useful for lazy initialization.
  _.once = function(func) {
    var ran = false, memo;
    return function() {
      if (ran) return memo;
      ran = true;
      memo = func.apply(this, arguments);
      func = null;
      return memo;
    };
  };

  // Returns the first function passed as an argument to the second,
  // allowing you to adjust arguments, run code before and after, and
  // conditionally execute the original function.
  _.wrap = function(func, wrapper) {
    return _.partial(wrapper, func);
  };

  // Returns a function that is the composition of a list of functions, each
  // consuming the return value of the function that follows.
  _.compose = function() {
    var funcs = arguments;
    return function() {
      var args = arguments;
      for (var i = funcs.length - 1; i >= 0; i--) {
        args = [funcs[i].apply(this, args)];
      }
      return args[0];
    };
  };

  // Returns a function that will only be executed after being called N times.
  _.after = function(times, func) {
    return function() {
      if (--times < 1) {
        return func.apply(this, arguments);
      }
    };
  };

  // Object Functions
  // ----------------

  // Retrieve the names of an object's properties.
  // Delegates to **ECMAScript 5**'s native `Object.keys`
  _.keys = function(obj) {
    if (!_.isObject(obj)) return [];
    if (nativeKeys) return nativeKeys(obj);
    var keys = [];
    for (var key in obj) if (_.has(obj, key)) keys.push(key);
    return keys;
  };

  // Retrieve the values of an object's properties.
  _.values = function(obj) {
    var keys = _.keys(obj);
    var length = keys.length;
    var values = new Array(length);
    for (var i = 0; i < length; i++) {
      values[i] = obj[keys[i]];
    }
    return values;
  };

  // Convert an object into a list of `[key, value]` pairs.
  _.pairs = function(obj) {
    var keys = _.keys(obj);
    var length = keys.length;
    var pairs = new Array(length);
    for (var i = 0; i < length; i++) {
      pairs[i] = [keys[i], obj[keys[i]]];
    }
    return pairs;
  };

  // Invert the keys and values of an object. The values must be serializable.
  _.invert = function(obj) {
    var result = {};
    var keys = _.keys(obj);
    for (var i = 0, length = keys.length; i < length; i++) {
      result[obj[keys[i]]] = keys[i];
    }
    return result;
  };

  // Return a sorted list of the function names available on the object.
  // Aliased as `methods`
  _.functions = _.methods = function(obj) {
    var names = [];
    for (var key in obj) {
      if (_.isFunction(obj[key])) names.push(key);
    }
    return names.sort();
  };

  // Extend a given object with all the properties in passed-in object(s).
  _.extend = function(obj) {
    each(slice.call(arguments, 1), function(source) {
      if (source) {
        for (var prop in source) {
          obj[prop] = source[prop];
        }
      }
    });
    return obj;
  };

  // Return a copy of the object only containing the whitelisted properties.
  _.pick = function(obj) {
    var copy = {};
    var keys = concat.apply(ArrayProto, slice.call(arguments, 1));
    each(keys, function(key) {
      if (key in obj) copy[key] = obj[key];
    });
    return copy;
  };

   // Return a copy of the object without the blacklisted properties.
  _.omit = function(obj) {
    var copy = {};
    var keys = concat.apply(ArrayProto, slice.call(arguments, 1));
    for (var key in obj) {
      if (!_.contains(keys, key)) copy[key] = obj[key];
    }
    return copy;
  };

  // Fill in a given object with default properties.
  _.defaults = function(obj) {
    each(slice.call(arguments, 1), function(source) {
      if (source) {
        for (var prop in source) {
          if (obj[prop] === void 0) obj[prop] = source[prop];
        }
      }
    });
    return obj;
  };

  // Create a (shallow-cloned) duplicate of an object.
  _.clone = function(obj) {
    if (!_.isObject(obj)) return obj;
    return _.isArray(obj) ? obj.slice() : _.extend({}, obj);
  };

  // Invokes interceptor with the obj, and then returns obj.
  // The primary purpose of this method is to "tap into" a method chain, in
  // order to perform operations on intermediate results within the chain.
  _.tap = function(obj, interceptor) {
    interceptor(obj);
    return obj;
  };

  // Internal recursive comparison function for `isEqual`.
  var eq = function(a, b, aStack, bStack) {
    // Identical objects are equal. `0 === -0`, but they aren't identical.
    // See the [Harmony `egal` proposal](http://wiki.ecmascript.org/doku.php?id=harmony:egal).
    if (a === b) return a !== 0 || 1 / a == 1 / b;
    // A strict comparison is necessary because `null == undefined`.
    if (a == null || b == null) return a === b;
    // Unwrap any wrapped objects.
    if (a instanceof _) a = a._wrapped;
    if (b instanceof _) b = b._wrapped;
    // Compare `[[Class]]` names.
    var className = toString.call(a);
    if (className != toString.call(b)) return false;
    switch (className) {
      // Strings, numbers, dates, and booleans are compared by value.
      case '[object String]':
        // Primitives and their corresponding object wrappers are equivalent; thus, `"5"` is
        // equivalent to `new String("5")`.
        return a == String(b);
      case '[object Number]':
        // `NaN`s are equivalent, but non-reflexive. An `egal` comparison is performed for
        // other numeric values.
        return a != +a ? b != +b : (a == 0 ? 1 / a == 1 / b : a == +b);
      case '[object Date]':
      case '[object Boolean]':
        // Coerce dates and booleans to numeric primitive values. Dates are compared by their
        // millisecond representations. Note that invalid dates with millisecond representations
        // of `NaN` are not equivalent.
        return +a == +b;
      // RegExps are compared by their source patterns and flags.
      case '[object RegExp]':
        return a.source == b.source &&
               a.global == b.global &&
               a.multiline == b.multiline &&
               a.ignoreCase == b.ignoreCase;
    }
    if (typeof a != 'object' || typeof b != 'object') return false;
    // Assume equality for cyclic structures. The algorithm for detecting cyclic
    // structures is adapted from ES 5.1 section 15.12.3, abstract operation `JO`.
    var length = aStack.length;
    while (length--) {
      // Linear search. Performance is inversely proportional to the number of
      // unique nested structures.
      if (aStack[length] == a) return bStack[length] == b;
    }
    // Objects with different constructors are not equivalent, but `Object`s
    // from different frames are.
    var aCtor = a.constructor, bCtor = b.constructor;
    if (aCtor !== bCtor && !(_.isFunction(aCtor) && (aCtor instanceof aCtor) &&
                             _.isFunction(bCtor) && (bCtor instanceof bCtor))
                        && ('constructor' in a && 'constructor' in b)) {
      return false;
    }
    // Add the first object to the stack of traversed objects.
    aStack.push(a);
    bStack.push(b);
    var size = 0, result = true;
    // Recursively compare objects and arrays.
    if (className == '[object Array]') {
      // Compare array lengths to determine if a deep comparison is necessary.
      size = a.length;
      result = size == b.length;
      if (result) {
        // Deep compare the contents, ignoring non-numeric properties.
        while (size--) {
          if (!(result = eq(a[size], b[size], aStack, bStack))) break;
        }
      }
    } else {
      // Deep compare objects.
      for (var key in a) {
        if (_.has(a, key)) {
          // Count the expected number of properties.
          size++;
          // Deep compare each member.
          if (!(result = _.has(b, key) && eq(a[key], b[key], aStack, bStack))) break;
        }
      }
      // Ensure that both objects contain the same number of properties.
      if (result) {
        for (key in b) {
          if (_.has(b, key) && !(size--)) break;
        }
        result = !size;
      }
    }
    // Remove the first object from the stack of traversed objects.
    aStack.pop();
    bStack.pop();
    return result;
  };

  // Perform a deep comparison to check if two objects are equal.
  _.isEqual = function(a, b) {
    return eq(a, b, [], []);
  };

  // Is a given array, string, or object empty?
  // An "empty" object has no enumerable own-properties.
  _.isEmpty = function(obj) {
    if (obj == null) return true;
    if (_.isArray(obj) || _.isString(obj)) return obj.length === 0;
    for (var key in obj) if (_.has(obj, key)) return false;
    return true;
  };

  // Is a given value a DOM element?
  _.isElement = function(obj) {
    return !!(obj && obj.nodeType === 1);
  };

  // Is a given value an array?
  // Delegates to ECMA5's native Array.isArray
  _.isArray = nativeIsArray || function(obj) {
    return toString.call(obj) == '[object Array]';
  };

  // Is a given variable an object?
  _.isObject = function(obj) {
    return obj === Object(obj);
  };

  // Add some isType methods: isArguments, isFunction, isString, isNumber, isDate, isRegExp.
  each(['Arguments', 'Function', 'String', 'Number', 'Date', 'RegExp'], function(name) {
    _['is' + name] = function(obj) {
      return toString.call(obj) == '[object ' + name + ']';
    };
  });

  // Define a fallback version of the method in browsers (ahem, IE), where
  // there isn't any inspectable "Arguments" type.
  if (!_.isArguments(arguments)) {
    _.isArguments = function(obj) {
      return !!(obj && _.has(obj, 'callee'));
    };
  }

  // Optimize `isFunction` if appropriate.
  if (typeof (/./) !== 'function') {
    _.isFunction = function(obj) {
      return typeof obj === 'function';
    };
  }

  // Is a given object a finite number?
  _.isFinite = function(obj) {
    return isFinite(obj) && !isNaN(parseFloat(obj));
  };

  // Is the given value `NaN`? (NaN is the only number which does not equal itself).
  _.isNaN = function(obj) {
    return _.isNumber(obj) && obj != +obj;
  };

  // Is a given value a boolean?
  _.isBoolean = function(obj) {
    return obj === true || obj === false || toString.call(obj) == '[object Boolean]';
  };

  // Is a given value equal to null?
  _.isNull = function(obj) {
    return obj === null;
  };

  // Is a given variable undefined?
  _.isUndefined = function(obj) {
    return obj === void 0;
  };

  // Shortcut function for checking if an object has a given property directly
  // on itself (in other words, not on a prototype).
  _.has = function(obj, key) {
    return hasOwnProperty.call(obj, key);
  };

  // Utility Functions
  // -----------------

  // Run Underscore.js in *noConflict* mode, returning the `_` variable to its
  // previous owner. Returns a reference to the Underscore object.
  _.noConflict = function() {
    root._ = previousUnderscore;
    return this;
  };

  // Keep the identity function around for default iterators.
  _.identity = function(value) {
    return value;
  };

  _.constant = function(value) {
    return function () {
      return value;
    };
  };

  _.property = function(key) {
    return function(obj) {
      return obj[key];
    };
  };

  // Returns a predicate for checking whether an object has a given set of `key:value` pairs.
  _.matches = function(attrs) {
    return function(obj) {
      if (obj === attrs) return true; //avoid comparing an object to itself.
      for (var key in attrs) {
        if (attrs[key] !== obj[key])
          return false;
      }
      return true;
    }
  };

  // Run a function **n** times.
  _.times = function(n, iterator, context) {
    var accum = Array(Math.max(0, n));
    for (var i = 0; i < n; i++) accum[i] = iterator.call(context, i);
    return accum;
  };

  // Return a random integer between min and max (inclusive).
  _.random = function(min, max) {
    if (max == null) {
      max = min;
      min = 0;
    }
    return min + Math.floor(Math.random() * (max - min + 1));
  };

  // A (possibly faster) way to get the current timestamp as an integer.
  _.now = Date.now || function() { return new Date().getTime(); };

  // List of HTML entities for escaping.
  var entityMap = {
    escape: {
      '&': '&amp;',
      '<': '&lt;',
      '>': '&gt;',
      '"': '&quot;',
      "'": '&#x27;'
    }
  };
  entityMap.unescape = _.invert(entityMap.escape);

  // Regexes containing the keys and values listed immediately above.
  var entityRegexes = {
    escape:   new RegExp('[' + _.keys(entityMap.escape).join('') + ']', 'g'),
    unescape: new RegExp('(' + _.keys(entityMap.unescape).join('|') + ')', 'g')
  };

  // Functions for escaping and unescaping strings to/from HTML interpolation.
  _.each(['escape', 'unescape'], function(method) {
    _[method] = function(string) {
      if (string == null) return '';
      return ('' + string).replace(entityRegexes[method], function(match) {
        return entityMap[method][match];
      });
    };
  });

  // If the value of the named `property` is a function then invoke it with the
  // `object` as context; otherwise, return it.
  _.result = function(object, property) {
    if (object == null) return void 0;
    var value = object[property];
    return _.isFunction(value) ? value.call(object) : value;
  };

  // Add your own custom functions to the Underscore object.
  _.mixin = function(obj) {
    each(_.functions(obj), function(name) {
      var func = _[name] = obj[name];
      _.prototype[name] = function() {
        var args = [this._wrapped];
        push.apply(args, arguments);
        return result.call(this, func.apply(_, args));
      };
    });
  };

  // Generate a unique integer id (unique within the entire client session).
  // Useful for temporary DOM ids.
  var idCounter = 0;
  _.uniqueId = function(prefix) {
    var id = ++idCounter + '';
    return prefix ? prefix + id : id;
  };

  // By default, Underscore uses ERB-style template delimiters, change the
  // following template settings to use alternative delimiters.
  _.templateSettings = {
    evaluate    : /<%([\s\S]+?)%>/g,
    interpolate : /<%=([\s\S]+?)%>/g,
    escape      : /<%-([\s\S]+?)%>/g
  };

  // When customizing `templateSettings`, if you don't want to define an
  // interpolation, evaluation or escaping regex, we need one that is
  // guaranteed not to match.
  var noMatch = /(.)^/;

  // Certain characters need to be escaped so that they can be put into a
  // string literal.
  var escapes = {
    "'":      "'",
    '\\':     '\\',
    '\r':     'r',
    '\n':     'n',
    '\t':     't',
    '\u2028': 'u2028',
    '\u2029': 'u2029'
  };

  var escaper = /\\|'|\r|\n|\t|\u2028|\u2029/g;

  // JavaScript micro-templating, similar to John Resig's implementation.
  // Underscore templating handles arbitrary delimiters, preserves whitespace,
  // and correctly escapes quotes within interpolated code.
  _.template = function(text, data, settings) {
    var render;
    settings = _.defaults({}, settings, _.templateSettings);

    // Combine delimiters into one regular expression via alternation.
    var matcher = new RegExp([
      (settings.escape || noMatch).source,
      (settings.interpolate || noMatch).source,
      (settings.evaluate || noMatch).source
    ].join('|') + '|$', 'g');

    // Compile the template source, escaping string literals appropriately.
    var index = 0;
    var source = "__p+='";
    text.replace(matcher, function(match, escape, interpolate, evaluate, offset) {
      source += text.slice(index, offset)
        .replace(escaper, function(match) { return '\\' + escapes[match]; });

      if (escape) {
        source += "'+\n((__t=(" + escape + "))==null?'':_.escape(__t))+\n'";
      }
      if (interpolate) {
        source += "'+\n((__t=(" + interpolate + "))==null?'':__t)+\n'";
      }
      if (evaluate) {
        source += "';\n" + evaluate + "\n__p+='";
      }
      index = offset + match.length;
      return match;
    });
    source += "';\n";

    // If a variable is not specified, place data values in local scope.
    if (!settings.variable) source = 'with(obj||{}){\n' + source + '}\n';

    source = "var __t,__p='',__j=Array.prototype.join," +
      "print=function(){__p+=__j.call(arguments,'');};\n" +
      source + "return __p;\n";

    try {
      render = new Function(settings.variable || 'obj', '_', source);
    } catch (e) {
      e.source = source;
      throw e;
    }

    if (data) return render(data, _);
    var template = function(data) {
      return render.call(this, data, _);
    };

    // Provide the compiled function source as a convenience for precompilation.
    template.source = 'function(' + (settings.variable || 'obj') + '){\n' + source + '}';

    return template;
  };

  // Add a "chain" function, which will delegate to the wrapper.
  _.chain = function(obj) {
    return _(obj).chain();
  };

  // OOP
  // ---------------
  // If Underscore is called as a function, it returns a wrapped object that
  // can be used OO-style. This wrapper holds altered versions of all the
  // underscore functions. Wrapped objects may be chained.

  // Helper function to continue chaining intermediate results.
  var result = function(obj) {
    return this._chain ? _(obj).chain() : obj;
  };

  // Add all of the Underscore functions to the wrapper object.
  _.mixin(_);

  // Add all mutator Array functions to the wrapper.
  each(['pop', 'push', 'reverse', 'shift', 'sort', 'splice', 'unshift'], function(name) {
    var method = ArrayProto[name];
    _.prototype[name] = function() {
      var obj = this._wrapped;
      method.apply(obj, arguments);
      if ((name == 'shift' || name == 'splice') && obj.length === 0) delete obj[0];
      return result.call(this, obj);
    };
  });

  // Add all accessor Array functions to the wrapper.
  each(['concat', 'join', 'slice'], function(name) {
    var method = ArrayProto[name];
    _.prototype[name] = function() {
      return result.call(this, method.apply(this._wrapped, arguments));
    };
  });

  _.extend(_.prototype, {

    // Start chaining a wrapped Underscore object.
    chain: function() {
      this._chain = true;
      return this;
    },

    // Extracts the result from a wrapped and chained object.
    value: function() {
      return this._wrapped;
    }

  });

  // AMD registration happens at the end for compatibility with AMD loaders
  // that may not enforce next-turn semantics on modules. Even though general
  // practice for AMD registration is to be anonymous, underscore registers
  // as a named module because, like jQuery, it is a base library that is
  // popular enough to be bundled in a third party lib, but not be part of
  // an AMD load request. Those cases could generate an error when an
  // anonymous define() is called outside of a loader request.
  if (typeof define === 'function' && define.amd) {
    define('underscore', [], function() {
      return _;
    });
  }
}).call(this);

},{}]},{},[11])