1 /*
2 * Copyright (C) 2009 Google Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
6 * met:
7 *
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 * * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 #ifndef V8EventListenerList_h
32 #define V8EventListenerList_h
33
34 #include "bindings/v8/V8Binding.h"
35 #include "bindings/v8/V8EventListener.h"
36 #include <v8.h>
37
38 namespace WebCore {
39
40 class LocalFrame;
41
42 enum ListenerLookupType {
43 ListenerFindOnly,
44 ListenerFindOrCreate,
45 };
46
47 // This is a container for V8EventListener objects that uses hidden properties of v8::Object to speed up lookups.
48 class V8EventListenerList {
49 public:
findWrapper(v8::Local<v8::Value> value,ScriptState * scriptState)50 static PassRefPtr<V8EventListener> findWrapper(v8::Local<v8::Value> value, ScriptState* scriptState)
51 {
52 ASSERT(scriptState->isolate()->InContext());
53 if (!value->IsObject())
54 return nullptr;
55
56 v8::Handle<v8::String> wrapperProperty = getHiddenProperty(false, scriptState->isolate());
57 return doFindWrapper(v8::Local<v8::Object>::Cast(value), wrapperProperty, scriptState);
58 }
59
60 template<typename WrapperType>
61 static PassRefPtr<V8EventListener> findOrCreateWrapper(v8::Local<v8::Value>, bool isAttribute, ScriptState*);
62
clearWrapper(v8::Handle<v8::Object> listenerObject,bool isAttribute,v8::Isolate * isolate)63 static void clearWrapper(v8::Handle<v8::Object> listenerObject, bool isAttribute, v8::Isolate* isolate)
64 {
65 v8::Handle<v8::String> wrapperProperty = getHiddenProperty(isAttribute, isolate);
66 listenerObject->DeleteHiddenValue(wrapperProperty);
67 }
68
69 static PassRefPtr<EventListener> getEventListener(ScriptState*, v8::Local<v8::Value>, bool isAttribute, ListenerLookupType);
70
71 private:
doFindWrapper(v8::Local<v8::Object> object,v8::Handle<v8::String> wrapperProperty,ScriptState * scriptState)72 static V8EventListener* doFindWrapper(v8::Local<v8::Object> object, v8::Handle<v8::String> wrapperProperty, ScriptState* scriptState)
73 {
74 v8::HandleScope scope(scriptState->isolate());
75 ASSERT(scriptState->isolate()->InContext());
76 v8::Local<v8::Value> listener = object->GetHiddenValue(wrapperProperty);
77 if (listener.IsEmpty())
78 return 0;
79 return static_cast<V8EventListener*>(v8::External::Cast(*listener)->Value());
80 }
81
getHiddenProperty(bool isAttribute,v8::Isolate * isolate)82 static inline v8::Handle<v8::String> getHiddenProperty(bool isAttribute, v8::Isolate* isolate)
83 {
84 return isAttribute ? v8AtomicString(isolate, "attributeListener") : v8AtomicString(isolate, "listener");
85 }
86 };
87
88 template<typename WrapperType>
findOrCreateWrapper(v8::Local<v8::Value> value,bool isAttribute,ScriptState * scriptState)89 PassRefPtr<V8EventListener> V8EventListenerList::findOrCreateWrapper(v8::Local<v8::Value> value, bool isAttribute, ScriptState* scriptState)
90 {
91 v8::Isolate* isolate = scriptState->isolate();
92 ASSERT(isolate->InContext());
93 if (!value->IsObject()
94 // Non-callable attribute setter input is treated as null (no wrapper)
95 || (isAttribute && !value->IsFunction()))
96 return nullptr;
97
98 v8::Local<v8::Object> object = v8::Local<v8::Object>::Cast(value);
99 v8::Handle<v8::String> wrapperProperty = getHiddenProperty(isAttribute, isolate);
100
101 V8EventListener* wrapper = doFindWrapper(object, wrapperProperty, scriptState);
102 if (wrapper)
103 return wrapper;
104
105 RefPtr<V8EventListener> wrapperPtr = WrapperType::create(object, isAttribute, scriptState);
106 if (wrapperPtr)
107 object->SetHiddenValue(wrapperProperty, v8::External::New(isolate, wrapperPtr.get()));
108
109 return wrapperPtr;
110 }
111
112 } // namespace WebCore
113
114 #endif // V8EventListenerList_h
115