git ssb

1
var LazyWatcher = require('./lib/lazy-watcher')
2
var isReferenceType = require('./lib/is-reference-type')
3
var resolve = require('./resolve')
4
5
module.exports = Array
6
7
function Array (defaultValues) {
8
  var object = []
9
  var sources = []
10
  var releases = []
11
12
  var binder = LazyWatcher(update, listen, unlisten)
13
  binder.value = object
14
15
  if (defaultValues && defaultValues.length) {
16
    defaultValues.forEach(add)
17
  }
18
19
  var observable = function MutantArray (listener) {
20
    if (!listener) {
21
      return binder.getValue()
22
    }
23
    return binder.addListener(listener)
24
  }
25
26
  observable.push = function (args) {
27
    for (var i = 0; i < arguments.length; i++) {
28
      add(arguments[i])
29
    }
30
    binder.broadcast()
31
  }
32
33
  observable.insert = function (valueOrObs, at) {
34
    sources.splice(at, 0, valueOrObs)
35
    if (binder.live) releases.splice(at, 0, bind(valueOrObs))
36
    object.splice(at, 0, resolve(valueOrObs))
37
    binder.broadcast()
38
  }
39
40
  observable.get = function (index) {
41
    return sources[index]
42
  }
43
44
  observable.getLength = function (index) {
45
    return sources.length
46
  }
47
48
  observable.includes = function (valueOrObs) {
49
    return !!~sources.indexOf(valueOrObs)
50
  }
51
52
  observable.indexOf = function (valueOrObs) {
53
    return sources.indexOf(valueOrObs)
54
  }
55
56
  observable.indexOf
57
58
  observable.pop = function () {
59
    var result = sources.pop()
60
    if (binder.live) tryInvoke(releases.pop())
61
    object.pop()
62
    binder.broadcast()
63
    return result
64
  }
65
66
  observable.shift = function () {
67
    var result = sources.shift()
68
    if (binder.live) tryInvoke(releases.shift())
69
    object.shift()
70
    binder.broadcast()
71
    return result
72
  }
73
74
  observable.clear = function () {
75
    releases.forEach(tryInvoke)
76
    sources.length = 0
77
    releases.length = 0
78
    object.length = 0
79
    binder.broadcast()
80
  }
81
82
  observable.delete = function (valueOrObs) {
83
    var index = sources.indexOf(valueOrObs)
84
    if (~index) {
85
      sources.splice(index, 1)
86
      if (binder.live) releases.splice(index, 1).forEach(tryInvoke)
87
      object.splice(index, 1)
88
      binder.broadcast()
89
    }
90
  }
91
92
  observable.set = function (values) {
93
    unlisten()
94
    sources.length = 0
95
    releases.length = 0
96
    object.length = 0
97
    values.forEach(add)
98
    if (binder.live) {
99
      listen()
100
      binder.broadcast()
101
    }
102
  }
103
104
  return observable
105
106
  // scoped
107
108
  function add (valueOrObs) {
109
    sources.push(valueOrObs)
110
    if (binder.live) {
111
      releases.push(bind(valueOrObs))
112
    }
113
    object.push(resolve(valueOrObs))
114
  }
115
116
  function bind (valueOrObs) {
117
    return typeof valueOrObs === 'function' ? valueOrObs(binder.onUpdate) : null
118
  }
119
120
  function listen () {
121
    sources.forEach(function (obs, i) {
122
      releases[i] = bind(obs)
123
    })
124
  }
125
126
  function unlisten () {
127
    releases.forEach(tryInvoke)
128
    releases.length = 0
129
  }
130
131
  function update () {
132
    var changed = false
133
    sources.forEach(function (key, i) {
134
      var newValue = resolve(observable[key])
135
      if (newValue !== object[i] || isReferenceType(newValue)) {
136
        object[i] = newValue
137
        changed = true
138
      }
139
    })
140
    return changed
141
  }
142
}
143
144
function tryInvoke (func) {
145
  if (typeof func === 'function') {
146
    func()
147
  }
148
}
149