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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 $Object.observe = function(object, callback) { | |
34 if (!IS_SPEC_OBJECT(object)) | |
35 throw MakeTypeError("observe_non_object", ["observe"]) | |
adamk
2012/10/23 16:29:44
Nit: need trailing semicolon. I think this is true
rafaelw
2012/10/23 21:21:35
Done. Although proxy.js doesn't have hardly *any*
rossberg
2012/10/24 09:57:24
I don't care either way, just be consistent within
rafaelw
2012/10/24 11:18:03
Ok. Going "with semicolons" ;-)
On 2012/10/24 09:
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36 if (!IS_SPEC_FUNCTION(callback)) | |
37 throw MakeTypeError("observe_non_function", ["observe"]) | |
38 if ($Object.isFrozen(callback)) | |
39 throw MakeTypeError("observe_callback_frozen") | |
40 | |
41 var observerInfo = observerInfoMap.get(callback); | |
42 if (IS_UNDEFINED(observerInfo)) { | |
43 observerInfo = new $Object(); | |
44 observerInfo.pendingChangeRecords = null; | |
45 // TODO: setup observerInfo.priority. | |
46 observerInfoMap.set(callback, observerInfo); | |
47 } | |
48 | |
49 var objectInfo = objectInfoMap.get(object); | |
50 if (IS_UNDEFINED(objectInfo)) { | |
51 objectInfo = new $Object(); | |
52 objectInfo.changeObservers = new $Array(callback); | |
53 // TODO: setup objectInfo.notifier | |
54 objectInfoMap.set(object, objectInfo); | |
55 return; | |
56 } | |
57 | |
58 var changeObservers = objectInfo.changeObservers; | |
59 if (changeObservers.indexOf(callback) >= 0) | |
60 return; | |
61 | |
62 changeObservers.push(callback); | |
63 } | |
64 | |
65 $Object.unobserve = function(object, callback) { | |
66 if (!IS_SPEC_OBJECT(object)) | |
67 throw MakeTypeError("observe_non_object", ["unobserve"]) | |
68 | |
69 var objectInfo = objectInfoMap.get(object); | |
70 if (IS_UNDEFINED(objectInfo)) | |
71 return; | |
72 | |
73 var observerInfo = observerInfoMap.get(callback); | |
74 | |
75 var changeObservers = objectInfo.changeObservers; | |
76 var index = changeObservers.indexOf(callback); | |
77 if (index < 0) | |
78 return; | |
79 | |
80 changeObservers.splice(index, 1); | |
81 } | |
82 | |
83 function EnqueueChangeRecord(changeRecord, observers) { | |
84 for (var i = 0; i < observers.length; i++) { | |
85 var observer = observers[i]; | |
86 var observerInfo = observerInfoMap.get(observer); | |
87 | |
88 // TODO: "activate" the observer | |
89 | |
90 var pendingChangeRecords = observerInfo.pendingChangeRecords; | |
91 if (IS_NULL(pendingChangeRecords)) { | |
92 pendingChangeRecords = observerInfo.pendingChangeRecords = new $Array(chan geRecord); | |
93 } else { | |
94 pendingChangeRecords.push(changeRecord); | |
95 } | |
96 } | |
97 } | |
98 | |
99 $Object.notify = function(object, changeRecord) { | |
100 // TODO: notifier needs to be [[THIS]] | |
101 if (!IS_STRING(changeRecord['type'])) | |
102 throw MakeTypeError("observe_type_non_string"); | |
103 | |
104 var objectInfo = objectInfoMap.get(object); | |
105 if (IS_UNDEFINED(objectInfo)) | |
106 return; | |
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 $Object.freeze(newRecord); | |
116 | |
117 EnqueueChangeRecord(newRecord, objectInfo.changeObservers); | |
118 } | |
119 | |
120 $Object.deliverChangeRecords = function(callback) { | |
121 if (!IS_SPEC_FUNCTION(callback)) | |
122 throw MakeTypeError("observe_non_function", ["deliverChangeRecords"]) | |
123 | |
124 var observerInfo = observerInfoMap.get(callback); | |
125 if (IS_UNDEFINED(observerInfo)) | |
126 return; | |
127 | |
128 var pendingChangeRecords = observerInfo.pendingChangeRecords; | |
129 if (IS_NULL(pendingChangeRecords)) | |
130 return; | |
131 | |
132 observerInfo.pendingChangeRecords = null; | |
133 | |
134 callback(pendingChangeRecords); | |
135 return; | |
136 } | |
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