2011-01-07 Adam Barth <abarth@webkit.org>
[WebKit-https.git] / Source / WebCore / bindings / v8 / V8Utilities.cpp
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30
31 #include "config.h"
32 #include "V8Utilities.h"
33
34 #include <v8.h>
35
36 #include "Document.h"
37 #include "Frame.h"
38 #include "ScriptExecutionContext.h"
39 #include "ScriptState.h"
40 #include "V8Binding.h"
41 #include "V8BindingState.h"
42 #include "V8Proxy.h"
43 #include "WorkerContext.h"
44 #include "WorkerContextExecutionProxy.h"
45
46 #include <wtf/Assertions.h>
47 #include "Frame.h"
48
49 namespace WebCore {
50
51 // Use an array to hold dependents. It works like a ref-counted scheme.
52 // A value can be added more than once to the DOM object.
53 void createHiddenDependency(v8::Handle<v8::Object> object, v8::Local<v8::Value> value, int cacheIndex)
54 {
55     v8::Local<v8::Value> cache = object->GetInternalField(cacheIndex);
56     if (cache->IsNull() || cache->IsUndefined()) {
57         cache = v8::Array::New();
58         object->SetInternalField(cacheIndex, cache);
59     }
60
61     v8::Local<v8::Array> cacheArray = v8::Local<v8::Array>::Cast(cache);
62     cacheArray->Set(v8::Integer::New(cacheArray->Length()), value);
63 }
64
65 void removeHiddenDependency(v8::Handle<v8::Object> object, v8::Local<v8::Value> value, int cacheIndex)
66 {
67     v8::Local<v8::Value> cache = object->GetInternalField(cacheIndex);
68     if (!cache->IsArray())
69         return;
70     v8::Local<v8::Array> cacheArray = v8::Local<v8::Array>::Cast(cache);
71     for (int i = cacheArray->Length() - 1; i >= 0; --i) {
72         v8::Local<v8::Value> cached = cacheArray->Get(v8::Integer::New(i));
73         if (cached->StrictEquals(value)) {
74             cacheArray->Delete(i);
75             return;
76         }
77     }
78 }
79     
80 void transferHiddenDependency(v8::Handle<v8::Object> object,
81                               EventListener* oldValue, 
82                               v8::Local<v8::Value> newValue, 
83                               int cacheIndex)
84 {
85     if (oldValue) {
86         V8AbstractEventListener* oldListener = V8AbstractEventListener::cast(oldValue);
87         if (oldListener) {
88             v8::Local<v8::Object> oldListenerObject = oldListener->getExistingListenerObject();
89             if (!oldListenerObject.IsEmpty())
90                 removeHiddenDependency(object, oldListenerObject, cacheIndex);
91         }
92     }
93     if (!newValue->IsNull() && !newValue->IsUndefined())
94         createHiddenDependency(object, newValue, cacheIndex);
95 }
96
97 bool processingUserGesture()
98 {
99     return V8BindingState::Only()->processingUserGesture();
100 }
101
102 Frame* callingOrEnteredFrame()
103 {
104     return V8BindingState::Only()->activeFrame();
105 }
106
107 bool shouldAllowNavigation(Frame* frame)
108 {
109     return V8BindingSecurity::shouldAllowNavigation(V8BindingState::Only(), frame);
110 }
111
112 KURL completeURL(const String& relativeURL)
113 {
114     return completeURL(V8BindingState::Only(), relativeURL);
115 }
116
117 ScriptExecutionContext* getScriptExecutionContext()
118 {
119 #if ENABLE(WORKERS)
120     if (WorkerScriptController* controller = WorkerScriptController::controllerForContext())
121         return controller->workerContext();
122 #endif
123
124     if (Frame* frame = V8Proxy::retrieveFrameForCurrentContext())
125         return frame->document()->scriptExecutionContext();
126
127     return 0;
128 }
129
130 } // namespace WebCore