-
Notifications
You must be signed in to change notification settings - Fork 1.3k
/
oop.js
427 lines (375 loc) · 14.4 KB
/
oop.js
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
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
/**
Adds object inheritance and manipulation utilities to the YUI instance. This
module is required by most YUI components.
@module oop
**/
var L = Y.Lang,
A = Y.Array,
OP = Object.prototype,
CLONE_MARKER = '_~yuim~_',
hasOwn = OP.hasOwnProperty,
toString = OP.toString;
/**
Calls the specified _action_ method on _o_ if it exists. Otherwise, if _o_ is an
array, calls the _action_ method on `Y.Array`, or if _o_ is an object, calls the
_action_ method on `Y.Object`.
If _o_ is an array-like object, it will be coerced to an array.
This is intended to be used with array/object iteration methods that share
signatures, such as `each()`, `some()`, etc.
@method dispatch
@param {Object} o Array or object to dispatch to.
@param {Function} f Iteration callback.
@param {Mixed} f.value Value being iterated.
@param {Mixed} f.key Current object key or array index.
@param {Mixed} f.object Object or array being iterated.
@param {Object} c `this` object to bind the iteration callback to.
@param {Boolean} proto If `true`, prototype properties of objects will be
iterated.
@param {String} action Function name to be dispatched on _o_. For example:
'some', 'each', etc.
@private
@return {Mixed} Returns the value returned by the chosen iteration action, which
varies.
**/
function dispatch(o, f, c, proto, action) {
if (o && o[action] && o !== Y) {
return o[action].call(o, f, c);
} else {
switch (A.test(o)) {
case 1:
return A[action](o, f, c);
case 2:
return A[action](Y.Array(o, 0, true), f, c);
default:
return Y.Object[action](o, f, c, proto);
}
}
}
/**
Augments the _receiver_ with prototype properties from the _supplier_. The
receiver may be a constructor function or an object. The supplier must be a
constructor function.
If the _receiver_ is an object, then the _supplier_ constructor will be called
immediately after _receiver_ is augmented, with _receiver_ as the `this` object.
If the _receiver_ is a constructor function, then all prototype methods of
_supplier_ that are copied to _receiver_ will be sequestered, and the
_supplier_ constructor will not be called immediately. The first time any
sequestered method is called on the _receiver_'s prototype, all sequestered
methods will be immediately copied to the _receiver_'s prototype, the
_supplier_'s constructor will be executed, and finally the newly unsequestered
method that was called will be executed.
This sequestering logic sounds like a bunch of complicated voodoo, but it makes
it cheap to perform frequent augmentation by ensuring that suppliers'
constructors are only called if a supplied method is actually used. If none of
the supplied methods is ever used, then there's no need to take the performance
hit of calling the _supplier_'s constructor.
@method augment
@param {Function|Object} receiver Object or function to be augmented.
@param {Function} supplier Function that supplies the prototype properties with
which to augment the _receiver_.
@param {Boolean} [overwrite=false] If `true`, properties already on the receiver
will be overwritten if found on the supplier's prototype.
@param {String[]} [whitelist] An array of property names. If specified,
only the whitelisted prototype properties will be applied to the receiver, and
all others will be ignored.
@param {Array|any} [args] Argument or array of arguments to pass to the
supplier's constructor when initializing.
@return {Function} Augmented object.
@for YUI
**/
Y.augment = function (receiver, supplier, overwrite, whitelist, args) {
var rProto = receiver.prototype,
sequester = rProto && supplier,
sProto = supplier.prototype,
to = rProto || receiver,
copy,
newPrototype,
replacements,
sequestered,
unsequester;
args = args ? Y.Array(args) : [];
if (sequester) {
newPrototype = {};
replacements = {};
sequestered = {};
copy = function (value, key) {
if (overwrite || !(key in rProto)) {
if (toString.call(value) === '[object Function]') {
sequestered[key] = value;
newPrototype[key] = replacements[key] = function () {
return unsequester(this, value, arguments);
};
} else {
newPrototype[key] = value;
}
}
};
unsequester = function (instance, fn, fnArgs) {
// Unsequester all sequestered functions.
for (var key in sequestered) {
if (hasOwn.call(sequestered, key)
&& instance[key] === replacements[key]) {
instance[key] = sequestered[key];
}
}
// Execute the supplier constructor.
supplier.apply(instance, args);
// Finally, execute the original sequestered function.
return fn.apply(instance, fnArgs);
};
if (whitelist) {
Y.Array.each(whitelist, function (name) {
if (name in sProto) {
copy(sProto[name], name);
}
});
} else {
Y.Object.each(sProto, copy, null, true);
}
}
Y.mix(to, newPrototype || sProto, overwrite, whitelist);
if (!sequester) {
supplier.apply(to, args);
}
return receiver;
};
/**
* Copies object properties from the supplier to the receiver. If the target has
* the property, and the property is an object, the target object will be
* augmented with the supplier's value.
*
* @method aggregate
* @param {Object} receiver Object to receive the augmentation.
* @param {Object} supplier Object that supplies the properties with which to
* augment the receiver.
* @param {Boolean} [overwrite=false] If `true`, properties already on the receiver
* will be overwritten if found on the supplier.
* @param {String[]} [whitelist] Whitelist. If supplied, only properties in this
* list will be applied to the receiver.
* @return {Object} Augmented object.
*/
Y.aggregate = function(r, s, ov, wl) {
return Y.mix(r, s, ov, wl, 0, true);
};
/**
* Utility to set up the prototype, constructor and superclass properties to
* support an inheritance strategy that can chain constructors and methods.
* Static members will not be inherited.
*
* @method extend
* @param {function} r the object to modify.
* @param {function} s the object to inherit.
* @param {object} px prototype properties to add/override.
* @param {object} sx static properties to add/override.
* @return {object} the extended object.
*/
Y.extend = function(r, s, px, sx) {
if (!s || !r) {
Y.error('extend failed, verify dependencies');
}
var sp = s.prototype, rp = Y.Object(sp);
r.prototype = rp;
rp.constructor = r;
r.superclass = sp;
// assign constructor property
if (s != Object && sp.constructor == OP.constructor) {
sp.constructor = s;
}
// add prototype overrides
if (px) {
Y.mix(rp, px, true);
}
// add object overrides
if (sx) {
Y.mix(r, sx, true);
}
return r;
};
/**
* Executes the supplied function for each item in
* a collection. Supports arrays, objects, and
* NodeLists
* @method each
* @param {object} o the object to iterate.
* @param {function} f the function to execute. This function
* receives the value, key, and object as parameters.
* @param {object} c the execution context for the function.
* @param {boolean} proto if true, prototype properties are
* iterated on objects.
* @return {YUI} the YUI instance.
*/
Y.each = function(o, f, c, proto) {
return dispatch(o, f, c, proto, 'each');
};
/**
* Executes the supplied function for each item in
* a collection. The operation stops if the function
* returns true. Supports arrays, objects, and
* NodeLists.
* @method some
* @param {object} o the object to iterate.
* @param {function} f the function to execute. This function
* receives the value, key, and object as parameters.
* @param {object} c the execution context for the function.
* @param {boolean} proto if true, prototype properties are
* iterated on objects.
* @return {boolean} true if the function ever returns true,
* false otherwise.
*/
Y.some = function(o, f, c, proto) {
return dispatch(o, f, c, proto, 'some');
};
/**
Deep object/array copy. Function clones are actually wrappers around the
original function. Array-like objects are treated as arrays. Primitives are
returned untouched. Optionally, a function can be provided to handle other data
types, filter keys, validate values, etc.
**Note:** Cloning a non-trivial object is a reasonably heavy operation, due to
the need to recursively iterate down non-primitive properties. Clone should be
used only when a deep clone down to leaf level properties is explicitly
required. This method will also
In many cases (for example, when trying to isolate objects used as hashes for
configuration properties), a shallow copy, using `Y.merge()` is normally
sufficient. If more than one level of isolation is required, `Y.merge()` can be
used selectively at each level which needs to be isolated from the original
without going all the way to leaf properties.
@method clone
@param {object} o what to clone.
@param {boolean} safe if true, objects will not have prototype items from the
source. If false, they will. In this case, the original is initially
protected, but the clone is not completely immune from changes to the source
object prototype. Also, cloned prototype items that are deleted from the
clone will result in the value of the source prototype being exposed. If
operating on a non-safe clone, items should be nulled out rather than
deleted.
@param {function} f optional function to apply to each item in a collection; it
will be executed prior to applying the value to the new object.
Return false to prevent the copy.
@param {object} c optional execution context for f.
@param {object} owner Owner object passed when clone is iterating an object.
Used to set up context for cloned functions.
@param {object} cloned hash of previously cloned objects to avoid multiple
clones.
@return {Array|Object} the cloned object.
**/
Y.clone = function(o, safe, f, c, owner, cloned) {
var o2, marked, stamp;
// Does not attempt to clone:
//
// * Non-typeof-object values, "primitive" values don't need cloning.
//
// * YUI instances, cloning complex object like YUI instances is not
// advised, this is like cloning the world.
//
// * DOM nodes (#2528250), common host objects like DOM nodes cannot be
// "subclassed" in Firefox and old versions of IE. Trying to use
// `Object.create()` or `Y.extend()` on a DOM node will throw an error in
// these browsers.
//
// Instad, the passed-in `o` will be return as-is when it matches one of the
// above criteria.
if (!L.isObject(o) ||
Y.instanceOf(o, YUI) ||
(o.addEventListener || o.attachEvent)) {
return o;
}
marked = cloned || {};
switch (L.type(o)) {
case 'date':
return new Date(o);
case 'regexp':
// if we do this we need to set the flags too
// return new RegExp(o.source);
return o;
case 'function':
// o2 = Y.bind(o, owner);
// break;
return o;
case 'array':
o2 = [];
break;
default:
// #2528250 only one clone of a given object should be created.
if (o[CLONE_MARKER]) {
return marked[o[CLONE_MARKER]];
}
stamp = Y.guid();
o2 = (safe) ? {} : Y.Object(o);
o[CLONE_MARKER] = stamp;
marked[stamp] = o;
}
Y.each(o, function(v, k) {
if ((k || k === 0) && (!f || (f.call(c || this, v, k, this, o) !== false))) {
if (k !== CLONE_MARKER) {
if (k == 'prototype') {
// skip the prototype
// } else if (o[k] === o) {
// this[k] = this;
} else {
this[k] =
Y.clone(v, safe, f, c, owner || o, marked);
}
}
}
}, o2);
if (!cloned) {
Y.Object.each(marked, function(v, k) {
if (v[CLONE_MARKER]) {
try {
delete v[CLONE_MARKER];
} catch (e) {
v[CLONE_MARKER] = null;
}
}
}, this);
marked = null;
}
return o2;
};
/**
* Returns a function that will execute the supplied function in the
* supplied object's context, optionally adding any additional
* supplied parameters to the beginning of the arguments collection the
* supplied to the function.
*
* @method bind
* @param {Function|String} f the function to bind, or a function name
* to execute on the context object.
* @param {object} c the execution context.
* @param {any} args* 0..n arguments to include before the arguments the
* function is executed with.
* @return {function} the wrapped function.
*/
Y.bind = function(f, c) {
var xargs = arguments.length > 2 ?
Y.Array(arguments, 2, true) : null;
return function() {
var fn = L.isString(f) ? c[f] : f,
args = (xargs) ?
xargs.concat(Y.Array(arguments, 0, true)) : arguments;
return fn.apply(c || fn, args);
};
};
/**
* Returns a function that will execute the supplied function in the
* supplied object's context, optionally adding any additional
* supplied parameters to the end of the arguments the function
* is executed with.
*
* @method rbind
* @param {Function|String} f the function to bind, or a function name
* to execute on the context object.
* @param {object} c the execution context.
* @param {any} args* 0..n arguments to append to the end of
* arguments collection supplied to the function.
* @return {function} the wrapped function.
*/
Y.rbind = function(f, c) {
var xargs = arguments.length > 2 ? Y.Array(arguments, 2, true) : null;
return function() {
var fn = L.isString(f) ? c[f] : f,
args = (xargs) ?
Y.Array(arguments, 0, true).concat(xargs) : arguments;
return fn.apply(c || fn, args);
};
};