This repository has been archived by the owner on Jul 25, 2020. It is now read-only.
-
Notifications
You must be signed in to change notification settings - Fork 0
/
index.js
452 lines (367 loc) · 10.5 KB
/
index.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
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
;(function (root, factory) {
if (typeof define === 'function' && define.amd) {
define(['ractive'], factory);
} else if (typeof exports === 'object') {
module.exports = factory(require('ractive'));
} else {
factory(root.Ractive);
}
}(this, function (Ractive) {
var Adaptor = Ractive.adaptors.Ractive = {
filter: filter,
wrap: wrap
};
/*
* Advanced options:
* You can adjust these settings via `Ractive.adaptors.Ractive.maxKeyLength`
* and so on. There's usually no need to do that, but it may be good for
* optimizing tests.
*/
Adaptor.fireWrapEvents = true;
Adaptor.maxKeyLength = 2048;
/*
* Ractive instance accessor methods that will be proxied by Ractive-Ractive.
*/
var ractiveMethods = {
add: {
mapAllowed: false
},
animate: {
mapAllowed: true
},
get: {
mapAllowed: false
},
merge: {
mapAllowed: false
},
observe: {
mapAllowed: true
},
observeOnce: {
mapAllowed: false
},
pop: {
mapAllowed: false
},
push: {
mapAllowed: false
},
set: {
mapAllowed: true
},
shift: {
mapAllowed: false
},
splice: {
mapAllowed: false
},
subtract: {
mapAllowed: false
},
toggle: {
mapAllowed: false
},
unshift: {
mapAllowed: false
},
update: {
mapAllowed: false
},
updateModel: {
mapAllowed: false
}
};
/*
* Check if the child is an Ractive instance.
*
* Also, if this key has been wrapped before, don't rewrap it. (Happens on
* deeply-nested values, and .reset() for some reason.)
*/
function filter (child, keypath, parent) {
if (!(child instanceof Ractive))
return false;
if (parent &&
parent._children &&
parent._children[keypath])
return false;
return true;
}
/*
* Global write lock.
* This prevents infinite loops from happening where a parent will set a
* value on the child, and the child will attempt to write back to the
* parent, and so on.
*/
var locked = Adaptor.locked = {};
function lock (key, fn) {
if (locked[key]) return;
try {
locked[key] = true;
return fn();
} finally {
delete locked[key];
}
}
/*
* Returns a wrapped Adaptor for Ractive.
* See: http://docs.ractivejs.org/latest/writing-adaptor-plugins
*/
function wrap (parent, child, keypath, prefixer) {
setup();
return {
get: get,
set: set,
reset: reset,
teardown: teardown
};
/*
* Initializes the adaptor.
*/
function setup () {
hookAccessors();
checkForRecursion();
storeReferences();
parent.root = parent.root || parent;
updateRoot();
child.on('change', onChange);
if (Adaptor.fireWrapEvents) {
child.fire('wrap', parent, keypath);
parent.fire('wrapchild', child, keypath);
}
}
function teardown () {
delete parent._children[keypath];
delete child._parents[parent._guid];
updateChildrenPattern();
if (parent._childKeys.length === 0) {
unhookAccessors();
}
// Calculate how many parents remain for the child
var numberOfParents = 0;
each(child._parents, function () {
numberOfParents++;
});
// Assign the child as its own root if it no longer has parents
if (numberOfParents === 0) {
updateRoot(child);
}
child.off('change', onChange);
if (Adaptor.fireWrapEvents) {
child.fire('unwrap', parent, keypath);
parent.fire('unwrapchild', child, keypath);
}
}
/*
* Propagate changes from child to parent.
* We well break it apart into key/vals and set those individually because
* some values may be locked.
*/
function onChange (updates) {
each(updates, function (value, key) {
lock(child._guid + key, function () {
parent._update(keypath + '.' + key);
});
});
}
/*
* Returns all attributes of the child, including computed properties.
* See: https://github.com/ractivejs/ractive/issues/1250
*/
function get () {
// Optimization: if there are no computed properties, returning all
// non-computed data should suffice.
if (!child.computed) return child.get();
var re = {};
each(child.get(), function (val, key) {
re[key] = val;
});
each(child.computed, function (_, key) {
if (typeof re[key] === 'undefined')
re[key] = child.get(key);
});
return re;
}
function set (key, value) {
lock(child._guid + key, function () {
child.set(key, value);
});
}
/*
* Allow setting values by passing a POJO to .set(), for instance,
* `.set('child', { ... })`. If anything else is passed onto .set()
* (like another Ractive instance, or another adaptor'able), destroy
* this wrapper.
*/
function reset (object) {
if (object && object.constructor === Object) {
child.set(object);
} else {
return false;
}
}
/*
* Update the parent's child key RegEx pattern used by accessors
*/
function updateChildrenPattern () {
if (!parent._children) {
delete parent._childrenPattern;
return;
}
// Collect the current `_children` keys
parent._childKeys = [];
each(parent._children, function (value, key) {
parent._childKeys.push(key);
});
if (parent._childKeys.length === 0) {
delete parent._childrenPattern;
return;
}
parent._childrenPattern = new RegExp("^(" + parent._childKeys.join(")\\..+?|(") + ")\\..+?$");
}
/*
* Generates a Ractive accessor proxy for the given method and configuration.
*/
function generateAccessor(method, config) {
config = config || {};
return function (keypath) {
var child;
var childKey;
var result;
// Exit early if there aren't any children or we're not targeting a keypath
if (parent._childrenPattern == null || keypath == null) {
return parent["_" + method].apply(parent, arguments);
}
// Handle a `key, value` set
if (isString(keypath) === true) {
childKey = parseAccessorKey(keypath);
child = parent._children[childKey];
// The key isn't a child of parent
if (child == null) {
return parent["_" + method].apply(parent, arguments);
}
// Remove the root of the key before marshalling it to the child
arguments[0] = arguments[0].replace(childKey + ".", "");
result = child[method].apply(child, arguments);
return result;
}
// Handle when only a value object is passed to the Ractive instance
if (config.mapAllowed === true) {
// Filter out and marshall keys which apply to children
each(keypath, function (value, key) {
childKey = parseAccessorKey(keypath);
child = parent._children[childKey];
if (child == null) {
return;
}
delete keypath[key];
// Remove the root of the key before marshalling it to the child
key = key.replace(childKey + ".", "");
child[method].call(child, key, value);
});
}
// Default behavior
return parent["_" + method].apply(parent, arguments);
};
}
/*
* Check all children to see if there are any matches and return the result.
*/
function parseAccessorKey(keypath) {
if (parent._childrenPattern == null) {
return;
}
var childKeys = parent._childrenPattern.exec(keypath);
if (childKeys == null) {
return;
}
// Skip the 1st result and check for a match
for (var i = 1, length = childKeys.length; i < length; i++) {
if (childKeys[i] != null) {
return childKeys[i];
}
}
}
/*
* Overwrite the original Ractive methods with Ractive-Ractive accessor proxies.
*/
function hookAccessors () {
// Only hook the accessors once
if (parent._accessorsHooked === true) {
return;
}
parent._accessorsHooked = true;
each(ractiveMethods, function (config, method) {
parent["_" + method] = parent[method];
parent[method] = generateAccessor(method, config);
});
}
/*
* Replace the Ractive-Ractive accessor proxies with the original implementations.
*/
function unhookAccessors () {
// Only hook the accessors once
if (parent._accessorsHooked !== true) {
return;
}
delete parent._accessorsHooked;
each(ractiveMethods, function (config, method) {
parent[method] = parent["_" + method];
delete parent["_" + method];
});
}
/*
* Updates the root reference of the child and its descendants.
*/
function updateRoot (root) {
root = root || parent.root;
child.root = root;
(function updateChildren(parent) {
if (parent._children == null) {
return;
}
each(parent._children, function (child) {
// Prevent infinite recursion
if (child.root === root) {
return;
}
child.root = root;
updateChildren(child);
});
})(child);
}
/*
* Die on recursion.
* Keypath will look like 'child.sub.parent.child.sub.parent' ad nauseum.
*/
function checkForRecursion () {
if (keypath && keypath.length > Adaptor.maxKeyLength)
throw new Error("Keypath too long (possible circular dependency)");
}
/*
* Let future wrappers know what we have wrapped Ractive instances.
* This value is used on `filter()`.
*/
function storeReferences () {
if (!parent._children) parent._children = {};
if (!child._parents) child._parents = {};
parent._children[keypath] = child;
child._parents[parent._guid] = parent;
updateChildrenPattern();
}
}
/*
* Cross-browser forEach helper
*/
function each (obj, fn) {
for (var key in obj) {
if (obj.hasOwnProperty(key)) fn(obj[key], key);
}
}
/*
* isString helper
*/
function isString (string) {
return typeof string == 'string' || (!!string && typeof string == 'object' && Object.prototype.toString.call(string) == '[object String]');
}
}));