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      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 V8DOMWrapper_h
     32 #define V8DOMWrapper_h
     33 
     34 #include "Event.h"
     35 #include "IsolatedWorld.h"
     36 #include "Node.h"
     37 #include "NodeFilter.h"
     38 #include "PlatformString.h"
     39 #include "V8CustomXPathNSResolver.h"
     40 #include "V8Event.h"
     41 #include "V8Utilities.h"
     42 #include "V8XPathNSResolver.h"
     43 #include "WrapperTypeInfo.h"
     44 #include "XPathNSResolver.h"
     45 #include <v8.h>
     46 
     47 namespace WebCore {
     48 
     49     class DOMWindow;
     50     class EventTarget;
     51     class Frame;
     52     class Node;
     53     class V8Proxy;
     54     class WorkerContext;
     55 
     56     enum ListenerLookupType {
     57         ListenerFindOnly,
     58         ListenerFindOrCreate,
     59     };
     60 
     61     class V8DOMWrapper {
     62     public:
     63 #ifndef NDEBUG
     64         // Checks if a v8 value can be a DOM wrapper
     65         static bool maybeDOMWrapper(v8::Handle<v8::Value>);
     66 #endif
     67 
     68         // Sets contents of a DOM wrapper.
     69         static void setDOMWrapper(v8::Handle<v8::Object> object, WrapperTypeInfo* type, void* cptr)
     70         {
     71             ASSERT(object->InternalFieldCount() >= 2);
     72             object->SetPointerInInternalField(v8DOMWrapperObjectIndex, cptr);
     73             object->SetPointerInInternalField(v8DOMWrapperTypeIndex, type);
     74         }
     75 
     76         static v8::Handle<v8::Object> lookupDOMWrapper(v8::Handle<v8::FunctionTemplate> functionTemplate, v8::Handle<v8::Object> object)
     77         {
     78             return object.IsEmpty() ? object : object->FindInstanceInPrototypeChain(functionTemplate);
     79         }
     80 
     81         static WrapperTypeInfo* domWrapperType(v8::Handle<v8::Object>);
     82 
     83         static v8::Handle<v8::Value> convertEventTargetToV8Object(PassRefPtr<EventTarget> eventTarget)
     84         {
     85             return convertEventTargetToV8Object(eventTarget.get());
     86         }
     87 
     88         static v8::Handle<v8::Value> convertEventTargetToV8Object(EventTarget*);
     89 
     90         static PassRefPtr<EventListener> getEventListener(v8::Local<v8::Value> value, bool isAttribute, ListenerLookupType lookup);
     91 
     92 #if ENABLE(XPATH)
     93         // XPath-related utilities
     94         static RefPtr<XPathNSResolver> getXPathNSResolver(v8::Handle<v8::Value> value, V8Proxy* proxy = 0);
     95 #endif
     96 
     97         // Wrap JS node filter in C++.
     98         static PassRefPtr<NodeFilter> wrapNativeNodeFilter(v8::Handle<v8::Value>);
     99 
    100         static v8::Local<v8::Function> getConstructorForContext(WrapperTypeInfo*, v8::Handle<v8::Context>);
    101         static v8::Local<v8::Function> getConstructor(WrapperTypeInfo*, v8::Handle<v8::Value> objectPrototype);
    102         static v8::Local<v8::Function> getConstructor(WrapperTypeInfo*, DOMWindow*);
    103 #if ENABLE(WORKERS)
    104         static v8::Local<v8::Function> getConstructor(WrapperTypeInfo*, WorkerContext*);
    105 #endif
    106 
    107         // Set JS wrapper of a DOM object, the caller in charge of increase ref.
    108         static void setJSWrapperForDOMObject(void*, v8::Persistent<v8::Object>);
    109         static void setJSWrapperForActiveDOMObject(void*, v8::Persistent<v8::Object>);
    110         static void setJSWrapperForDOMNode(Node*, v8::Persistent<v8::Object>);
    111 
    112         static bool isValidDOMObject(v8::Handle<v8::Value>);
    113 
    114         // Check whether a V8 value is a wrapper of type |classType|.
    115         static bool isWrapperOfType(v8::Handle<v8::Value>, WrapperTypeInfo*);
    116 
    117         static void setHiddenReference(v8::Handle<v8::Object> parent, v8::Handle<v8::Value> child);
    118 
    119         // Set hidden references in a DOMWindow object of a frame.
    120         static void setHiddenWindowReference(Frame*, v8::Handle<v8::Value>);
    121 
    122         static v8::Local<v8::Object> instantiateV8Object(V8Proxy* proxy, WrapperTypeInfo*, void* impl);
    123 
    124         static v8::Handle<v8::Object> getWrapper(Node* node)
    125         {
    126             ASSERT(WTF::isMainThread());
    127             if (LIKELY(!IsolatedWorld::count())) {
    128                 v8::Persistent<v8::Object>* wrapper = node->wrapper();
    129                 if (wrapper)
    130                     return *wrapper;
    131             }
    132             return getWrapperSlow(node);
    133         }
    134 
    135     private:
    136         static v8::Handle<v8::Object> getWrapperSlow(Node*);
    137     };
    138 
    139 }
    140 
    141 #endif // V8DOMWrapper_h
    142