Blame view

node_modules/mongoose/lib/statemachine.js 4.29 KB
46de8790   Tarpit Grover   first commit
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178

/*!
 * Module dependencies.
 */

var utils = require('./utils');

/*!
 * StateMachine represents a minimal `interface` for the
 * constructors it builds via StateMachine.ctor(...).
 *
 * @api private
 */

var StateMachine = module.exports = exports = function StateMachine () {
  this.paths = {};
  this.states = {};
}

/*!
 * StateMachine.ctor('state1', 'state2', ...)
 * A factory method for subclassing StateMachine.
 * The arguments are a list of states. For each state,
 * the constructor's prototype gets state transition
 * methods named after each state. These transition methods
 * place their path argument into the given state.
 *
 * @param {String} state
 * @param {String} [state]
 * @return {Function} subclass constructor
 * @private
 */

StateMachine.ctor = function () {
  var states = utils.args(arguments);

  var ctor = function () {
    StateMachine.apply(this, arguments);
    this.stateNames = states;

    var i = states.length
      , state;

    while (i--) {
      state = states[i];
      this.states[state] = {};
    }
  };

  ctor.prototype.__proto__ = StateMachine.prototype;

  states.forEach(function (state) {
    // Changes the `path`'s state to `state`.
    ctor.prototype[state] = function (path) {
      this._changeState(path, state);
    }
  });

  return ctor;
};

/*!
 * This function is wrapped by the state change functions:
 *
 * - `require(path)`
 * - `modify(path)`
 * - `init(path)`
 *
 * @api private
 */

StateMachine.prototype._changeState = function _changeState (path, nextState) {
  var prevBucket = this.states[this.paths[path]];
  if (prevBucket) delete prevBucket[path];

  this.paths[path] = nextState;
  this.states[nextState][path] = true;
}

/*!
 * ignore
 */

StateMachine.prototype.clear = function clear (state) {
  var keys = Object.keys(this.states[state])
    , i = keys.length
    , path

  while (i--) {
    path = keys[i];
    delete this.states[state][path];
    delete this.paths[path];
  }
}

/*!
 * Checks to see if at least one path is in the states passed in via `arguments`
 * e.g., this.some('required', 'inited')
 *
 * @param {String} state that we want to check for.
 * @private
 */

StateMachine.prototype.some = function some () {
  var self = this;
  var what = arguments.length ? arguments : this.stateNames;
  return Array.prototype.some.call(what, function (state) {
    return Object.keys(self.states[state]).length;
  });
}

/*!
 * This function builds the functions that get assigned to `forEach` and `map`,
 * since both of those methods share a lot of the same logic.
 *
 * @param {String} iterMethod is either 'forEach' or 'map'
 * @return {Function}
 * @api private
 */

StateMachine.prototype._iter = function _iter (iterMethod) {
  return function () {
    var numArgs = arguments.length
      , states = utils.args(arguments, 0, numArgs-1)
      , callback = arguments[numArgs-1];

    if (!states.length) states = this.stateNames;

    var self = this;

    var paths = states.reduce(function (paths, state) {
      return paths.concat(Object.keys(self.states[state]));
    }, []);

    return paths[iterMethod](function (path, i, paths) {
      return callback(path, i, paths);
    });
  };
}

/*!
 * Iterates over the paths that belong to one of the parameter states.
 *
 * The function profile can look like:
 * this.forEach(state1, fn);         // iterates over all paths in state1
 * this.forEach(state1, state2, fn); // iterates over all paths in state1 or state2
 * this.forEach(fn);                 // iterates over all paths in all states
 *
 * @param {String} [state]
 * @param {String} [state]
 * @param {Function} callback
 * @private
 */

StateMachine.prototype.forEach = function forEach () {
  this.forEach = this._iter('forEach');
  return this.forEach.apply(this, arguments);
}

/*!
 * Maps over the paths that belong to one of the parameter states.
 *
 * The function profile can look like:
 * this.forEach(state1, fn);         // iterates over all paths in state1
 * this.forEach(state1, state2, fn); // iterates over all paths in state1 or state2
 * this.forEach(fn);                 // iterates over all paths in all states
 *
 * @param {String} [state]
 * @param {String} [state]
 * @param {Function} callback
 * @return {Array}
 * @private
 */

StateMachine.prototype.map = function map () {
  this.map = this._iter('map');
  return this.map.apply(this, arguments);
}