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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 InternalObjectIsFrozen = $Object.isFrozen; | |
31 var InternalObjectFreeze = $Object.freeze; | |
32 | |
33 var InternalWeakMapProto = { | |
34 __proto__: null, | |
35 set: $WeakMap.prototype.set, | |
36 get: $WeakMap.prototype.get, | |
37 has: $WeakMap.prototype.has | |
38 } | |
arv (Not doing code reviews)
2012/10/25 20:43:44
semicolon
| |
39 | |
40 function createInternalWeakMap() { | |
41 var map = new $WeakMap; | |
42 map.__proto__ = InternalWeakMapProto; | |
43 return map; | |
44 } | |
45 | |
46 var observerInfoMap = createInternalWeakMap(); | |
47 var objectInfoMap = createInternalWeakMap(); | |
48 | |
49 function ObjectObserve(object, callback) { | |
50 if (!IS_SPEC_OBJECT(object)) | |
51 throw MakeTypeError("observe_non_object", ["observe"]); | |
52 if (!IS_SPEC_FUNCTION(callback)) | |
53 throw MakeTypeError("observe_non_function", ["observe"]); | |
54 if (InternalObjectIsFrozen(callback)) | |
55 throw MakeTypeError("observe_callback_frozen"); | |
56 | |
57 if (!observerInfoMap.has(callback)) { | |
58 // TODO: setup observerInfo.priority. | |
59 observerInfoMap.set(callback, { | |
60 pendingChangeRecords: null | |
61 }); | |
62 } | |
63 | |
64 var objectInfo = objectInfoMap.get(object); | |
65 if (IS_UNDEFINED(objectInfo)) { | |
66 // TODO: setup objectInfo.notifier | |
67 objectInfo = { | |
68 changeObservers: new InternalArray(callback) | |
69 }; | |
70 objectInfoMap.set(object, objectInfo); | |
71 return; | |
72 } | |
73 | |
74 var changeObservers = objectInfo.changeObservers; | |
75 if (changeObservers.indexOf(callback) >= 0) | |
76 return; | |
77 | |
78 changeObservers.push(callback); | |
79 } | |
80 | |
81 function ObjectUnobserve(object, callback) { | |
82 if (!IS_SPEC_OBJECT(object)) | |
83 throw MakeTypeError("observe_non_object", ["unobserve"]); | |
84 | |
85 var objectInfo = objectInfoMap.get(object); | |
86 if (IS_UNDEFINED(objectInfo)) | |
87 return; | |
88 | |
89 var changeObservers = objectInfo.changeObservers; | |
90 var index = changeObservers.indexOf(callback); | |
91 if (index < 0) | |
92 return; | |
93 | |
94 changeObservers.splice(index, 1); | |
arv (Not doing code reviews)
2012/10/25 20:43:44
This can be a Set. Sets are ordered and we will ge
rafaelw
2012/10/26 05:34:14
Unfortunately, sets don't have iteration yet.
On
| |
95 } | |
96 | |
97 function EnqueueChangeRecord(changeRecord, observers) { | |
98 for (var i = 0; i < observers.length; i++) { | |
99 var observer = observers[i]; | |
100 var observerInfo = observerInfoMap.get(observer); | |
101 | |
102 // TODO: "activate" the observer | |
103 | |
104 if (IS_NULL(observerInfo.pendingChangeRecords)) { | |
105 observerInfo.pendingChangeRecords = new InternalArray(changeRecord); | |
106 } else { | |
107 observerInfo.pendingChangeRecords.push(changeRecord); | |
108 } | |
109 } | |
110 } | |
111 | |
112 function ObjectNotify(object, changeRecord) { | |
113 // TODO: notifier needs to be [[THIS]] | |
114 if (!IS_STRING(changeRecord.type)) | |
115 throw MakeTypeError("observe_type_non_string"); | |
116 | |
117 var objectInfo = objectInfoMap.get(object); | |
118 if (IS_UNDEFINED(objectInfo)) | |
119 return; | |
120 | |
121 var newRecord = { | |
122 object: object // TODO: Needs to be 'object' retreived from notifier | |
123 }; | |
124 for (var prop in changeRecord) { | |
125 if (prop === 'object') | |
126 continue; | |
127 newRecord[prop] = changeRecord[prop]; | |
128 } | |
129 InternalObjectFreeze(newRecord); | |
130 | |
131 EnqueueChangeRecord(newRecord, objectInfo.changeObservers); | |
132 } | |
133 | |
134 function ObjectDeliverChangeRecords(callback) { | |
135 if (!IS_SPEC_FUNCTION(callback)) | |
136 throw MakeTypeError("observe_non_function", ["deliverChangeRecords"]); | |
137 | |
138 var observerInfo = observerInfoMap.get(callback); | |
139 if (IS_UNDEFINED(observerInfo)) | |
140 return; | |
141 | |
142 var pendingChangeRecords = observerInfo.pendingChangeRecords; | |
143 if (IS_NULL(pendingChangeRecords)) | |
144 return; | |
145 | |
146 observerInfo.pendingChangeRecords = null; | |
147 var delivered = []; | |
148 %MoveArrayContents(pendingChangeRecords, delivered); | |
149 try { | |
150 %Call(void 0, delivered, callback); | |
151 } catch (ex) {} | |
152 } | |
153 | |
154 function SetupObjectObserve() { | |
155 %CheckIsBootstrapping(); | |
156 InstallFunctions($Object, DONT_ENUM, $Array( | |
157 "deliverChangeRecords", ObjectDeliverChangeRecords, | |
158 "notify", ObjectNotify, // TODO: Remove when getNotifier is implemented. | |
159 "observe", ObjectObserve, | |
160 "unobserve", ObjectUnobserve | |
161 )); | |
162 } | |
163 | |
164 SetupObjectObserve(); | |
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