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1 // Copyright 2012 the V8 project authors. All rights reserved. | |
2 // Redistribution and use in source and binary forms, with or without | |
3 // modification, are permitted provided that the following conditions are | |
4 // met: | |
5 // | |
6 // * Redistributions of source code must retain the above copyright | |
7 // notice, this list of conditions and the following disclaimer. | |
8 // * Redistributions in binary form must reproduce the above | |
9 // copyright notice, this list of conditions and the following | |
10 // disclaimer in the documentation and/or other materials provided | |
11 // with the distribution. | |
12 // * Neither the name of Google Inc. nor the names of its | |
13 // contributors may be used to endorse or promote products derived | |
14 // from this software without specific prior written permission. | |
15 // | |
16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
27 | |
28 "use strict"; | |
29 | |
30 var observerInfoMap = new $WeakMap; | |
31 var objectInfoMap = new $WeakMap; | |
32 | |
33 $Object.observe = function(object, callback) { | |
34 if (!IS_SPEC_OBJECT(object)) | |
35 throw MakeTypeError("TODO", ["TODO"]) | |
36 if (!IS_SPEC_FUNCTION(callback)) | |
37 throw MakeTypeError("TODO", ["TODO"]) | |
38 if ($Object.isFrozen(callback)) | |
39 throw MakeTypeError("TODO", ["TODO"]) | |
40 | |
41 var objectInfo = objectInfoMap.get(object); | |
42 var observerInfo = observerInfoMap.get(callback); | |
43 | |
44 if (IS_UNDEFINED(objectInfo)) { | |
45 objectInfo = new $Object(); | |
46 objectInfo.changeObservers = new $Array(1); | |
47 objectInfo.changeObservers[0] = callback; | |
adamk
2012/10/23 15:35:57
Even if we need $Array to avoid array literals her
rafaelw
2012/10/23 16:18:20
Done.
| |
48 // TODO: setup objectInfo.notifier | |
49 objectInfoMap.set(object, objectInfo); | |
50 | |
51 observerInfo = new $Object(); | |
adamk
2012/10/23 15:35:57
This doesn't seem right, here you want to see if o
rafaelw
2012/10/23 16:18:20
Good catch. For some reason I was thinking these a
| |
52 observerInfo.pendingChangeRecords = null; | |
53 // TODO: setup observerInfo.priority. | |
54 observerInfoMap.set(callback, observerInfo); | |
55 return; | |
56 } | |
57 | |
58 var changeObservers = objectInfo.changeObservers; | |
59 for (var i = 0; i < changeObservers.length; i++) { | |
adamk
2012/10/23 15:35:57
Can you use changeObservers.indexOf() instead of t
rafaelw
2012/10/23 16:18:20
Done.
| |
60 if (changeObservers[i] === callback) | |
61 return; | |
62 } | |
63 | |
64 changeObservers.push(callback); | |
65 } | |
66 | |
67 $Object.unobserve = function(object, callback) { | |
68 if (!IS_SPEC_OBJECT(object)) | |
69 throw MakeTypeError("TODO", ["TODO"]) | |
70 | |
71 var objectInfo = objectInfoMap.get(object); | |
72 var observerInfo = observerInfoMap.get(callback); | |
adamk
2012/10/23 15:35:57
Can move this hash lookup after the undefined chec
rafaelw
2012/10/23 16:18:20
Done.
| |
73 if (IS_UNDEFINED(objectInfo)) | |
74 return; | |
75 | |
76 var changeObservers = objectInfo.changeObservers; | |
77 for (var i = 0; i < changeObservers.length; i++) { | |
adamk
2012/10/23 15:35:57
Same question re: indexOf
rafaelw
2012/10/23 16:18:20
Done.
| |
78 if (changeObservers[i] === callback) { | |
79 changeObservers.splice(i, 1); | |
80 return; | |
81 } | |
82 } | |
83 } | |
84 | |
85 function EnqueueChangeRecord(changeRecord, observers) { | |
86 for (var i = 0; i < observers.length; i++) { | |
87 var observer = observers[i]; | |
88 var observerInfo = observerInfoMap.get(observer); | |
89 | |
90 // TODO: "activate" the observer | |
91 | |
92 var pendingChangeRecords = observerInfo.pendingChangeRecords; | |
93 if (IS_NULL(pendingChangeRecords)) { | |
94 pendingChangeRecords = observerInfo.pendingChangeRecords = new $Array(1); | |
adamk
2012/10/23 15:35:57
Again, $Array(changeRecord) should suffice if lite
rafaelw
2012/10/23 16:18:20
Done.
| |
95 pendingChangeRecords[0] = changeRecord | |
96 } else { | |
97 pendingChangeRecords.push(changeRecord); | |
98 } | |
99 } | |
100 } | |
101 | |
102 $Object.notify = function(object, changeRecord) { | |
103 // TODO: notifier needs to be [[THIS]] | |
104 var type = changeRecord['type']; | |
adamk
2012/10/23 15:35:57
Nit: no need to copy this into a local, methinkgs:
rafaelw
2012/10/23 16:18:20
Done.
| |
105 if (!IS_STRING(type)) | |
106 MakeTypeError("TODO", ["TODO"]); // TODO | |
107 | |
108 var newRecord = new $Object(); | |
109 newRecord['object'] = object; // TODO: Needs to be 'object' retreived from not ifier | |
110 for (var prop in changeRecord) { | |
111 if (prop === 'object') | |
112 continue; | |
113 newRecord[prop] = changeRecord[prop]; | |
114 } | |
115 | |
116 $Object.freeze(newRecord); | |
117 var objectInfo = objectInfoMap.get(object); | |
118 if (IS_UNDEFINED(objectInfo)) | |
adamk
2012/10/23 15:35:57
Probably want to move this before the creation of
rafaelw
2012/10/23 16:18:20
Done. Also updated spec to clarify this behavior
| |
119 return; | |
120 | |
121 EnqueueChangeRecord(newRecord, objectInfo.changeObservers); | |
122 } | |
123 | |
124 $Object.deliverChangeRecords = function(callback) { | |
125 if (!IS_SPEC_FUNCTION(callback)) | |
126 throw MakeTypeError("TODO", ["TODO"]) | |
127 | |
128 var observerInfo = observerInfoMap.get(callback); | |
129 if (!observerInfo) | |
adamk
2012/10/23 15:35:57
Should be if (IS_UNDEFINED()), I think?
rafaelw
2012/10/23 16:18:20
Done.
| |
130 return false; | |
adamk
2012/10/23 15:35:57
Should be just return, per spec:
Note: The user f
rafaelw
2012/10/23 16:18:20
Done.
| |
131 | |
132 var pendingChangeRecords = observerInfo.pendingChangeRecords; | |
133 if (IS_NULL(pendingChangeRecords)) | |
134 return false; | |
adamk
2012/10/23 15:35:57
Ditto, should return undefined.
rafaelw
2012/10/23 16:18:20
Done.
| |
135 | |
136 observerInfo.pendingChangeRecords = null; | |
137 | |
138 callback(pendingChangeRecords); | |
139 return true; | |
adamk
2012/10/23 15:35:57
ditto, should return undefined.
rafaelw
2012/10/23 16:18:20
Done.
| |
140 } | |
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