jscallbackobjectfunctions.h

linux下开源浏览器WebKit的源码,市面上的很多商用浏览器都是移植自WebKit

/*
 * Copyright (C) 2006, 2008 Apple Inc. All rights reserved.
 * Copyright (C) 2007 Eric Seidel <[e-mail]>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 */

#include "APICast.h"
#include "Error.h"
#include "JSCallbackFunction.h"
#include "JSClassRef.h"
#include "JSGlobalObject.h"
#include "JSLock.h"
#include "JSObjectRef.h"
#include "JSString.h"
#include "JSStringRef.h"
#include "OpaqueJSString.h"
#include "PropertyNameArray.h"
#include <wtf/Vector.h>

namespace JSC {

template <class Base>
inline JSCallbackObject<Base>* JSCallbackObject<Base>::asCallbackObject(JSValuePtr value)
{
    ASSERT(asObject(value)->inherits(&info));
    return static_cast<JSCallbackObject*>(asObject(value));
}

template <class Base>
JSCallbackObject<Base>::JSCallbackObject(ExecState* exec, PassRefPtr<Structure> structure, JSClassRef jsClass, void* data)
    : Base(structure)
    , m_callbackObjectData(new JSCallbackObjectData(data, jsClass))
{
    init(exec);
}

// Global object constructor.
// FIXME: Move this into a separate JSGlobalCallbackObject class derived from this one.
template <class Base>
JSCallbackObject<Base>::JSCallbackObject(JSClassRef jsClass)
    : Base()
    , m_callbackObjectData(new JSCallbackObjectData(0, jsClass))
{
    ASSERT(Base::isGlobalObject());
    init(static_cast<JSGlobalObject*>(this)->globalExec());
}

template <class Base>
void JSCallbackObject<Base>::init(ExecState* exec)
{
    ASSERT(exec);
    
    Vector<JSObjectInitializeCallback, 16> initRoutines;
    JSClassRef jsClass = classRef();
    do {
        if (JSObjectInitializeCallback initialize = jsClass->initialize)
            initRoutines.append(initialize);
    } while ((jsClass = jsClass->parentClass));
    
    // initialize from base to derived
    for (int i = static_cast<int>(initRoutines.size()) - 1; i >= 0; i--) {
        JSLock::DropAllLocks dropAllLocks(exec);
        JSObjectInitializeCallback initialize = initRoutines[i];
        initialize(toRef(exec), toRef(this));
    }
}

template <class Base>
JSCallbackObject<Base>::~JSCallbackObject()
{
    JSObjectRef thisRef = toRef(this);
    
    for (JSClassRef jsClass = classRef(); jsClass; jsClass = jsClass->parentClass)
        if (JSObjectFinalizeCallback finalize = jsClass->finalize)
            finalize(thisRef);
}

template <class Base>
UString JSCallbackObject<Base>::className() const
{
    UString thisClassName = classRef()->className();
    if (!thisClassName.isNull())
        return thisClassName;
    
    return Base::className();
}

template <class Base>
bool JSCallbackObject<Base>::getOwnPropertySlot(ExecState* exec, const Identifier& propertyName, PropertySlot& slot)
{
    JSContextRef ctx = toRef(exec);
    JSObjectRef thisRef = toRef(this);
    RefPtr<OpaqueJSString> propertyNameRef;
    
    for (JSClassRef jsClass = classRef(); jsClass; jsClass = jsClass->parentClass) {
        // optional optimization to bypass getProperty in cases when we only need to know if the property exists
        if (JSObjectHasPropertyCallback hasProperty = jsClass->hasProperty) {
            if (!propertyNameRef)
                propertyNameRef = OpaqueJSString::create(propertyName.ustring());
            JSLock::DropAllLocks dropAllLocks(exec);
            if (hasProperty(ctx, thisRef, propertyNameRef.get())) {
                slot.setCustom(this, callbackGetter);
                return true;
            }
        } else if (JSObjectGetPropertyCallback getProperty = jsClass->getProperty) {
            if (!propertyNameRef)
                propertyNameRef = OpaqueJSString::create(propertyName.ustring());
            JSLock::DropAllLocks dropAllLocks(exec);
            if (JSValueRef value = getProperty(ctx, thisRef, propertyNameRef.get(), toRef(exec->exceptionSlot()))) {
                slot.setValue(toJS(value));
                return true;
            }
        }
        
        if (OpaqueJSClassStaticValuesTable* staticValues = jsClass->staticValues(exec)) {
            if (staticValues->contains(propertyName.ustring().rep())) {
                slot.setCustom(this, staticValueGetter);
                return true;
            }
        }
        
        if (OpaqueJSClassStaticFunctionsTable* staticFunctions = jsClass->staticFunctions(exec)) {
            if (staticFunctions->contains(propertyName.ustring().rep())) {
                slot.setCustom(this, staticFunctionGetter);
                return true;
            }
        }
    }
    
    return Base::getOwnPropertySlot(exec, propertyName, slot);
}

template <class Base>
bool JSCallbackObject<Base>::getOwnPropertySlot(ExecState* exec, unsigned propertyName, PropertySlot& slot)
{
    return getOwnPropertySlot(exec, Identifier::from(exec, propertyName), slot);
}

template <class Base>
void JSCallbackObject<Base>::put(ExecState* exec, const Identifier& propertyName, JSValuePtr value, PutPropertySlot& slot)
{
    JSContextRef ctx = toRef(exec);
    JSObjectRef thisRef = toRef(this);
    RefPtr<OpaqueJSString> propertyNameRef;
    JSValueRef valueRef = toRef(value);
    
    for (JSClassRef jsClass = classRef(); jsClass; jsClass = jsClass->parentClass) {
        if (JSObjectSetPropertyCallback setProperty = jsClass->setProperty) {
            if (!propertyNameRef)
                propertyNameRef = OpaqueJSString::create(propertyName.ustring());
            JSLock::DropAllLocks dropAllLocks(exec);
            if (setProperty(ctx, thisRef, propertyNameRef.get(), valueRef, toRef(exec->exceptionSlot())))
                return;
        }
        
        if (OpaqueJSClassStaticValuesTable* staticValues = jsClass->staticValues(exec)) {
            if (StaticValueEntry* entry = staticValues->get(propertyName.ustring().rep())) {
                if (entry->attributes & kJSPropertyAttributeReadOnly)
                    return;
                if (JSObjectSetPropertyCallback setProperty = entry->setProperty) {
                    if (!propertyNameRef)
                        propertyNameRef = OpaqueJSString::create(propertyName.ustring());
                    JSLock::DropAllLocks dropAllLocks(exec);
                    if (setProperty(ctx, thisRef, propertyNameRef.get(), valueRef, toRef(exec->exceptionSlot())))
                        return;
                } else
                    throwError(exec, ReferenceError, "Attempt to set a property that is not settable.");
            }
        }
        
        if (OpaqueJSClassStaticFunctionsTable* staticFunctions = jsClass->staticFunctions(exec)) {
            if (StaticFunctionEntry* entry = staticFunctions->get(propertyName.ustring().rep())) {
                if (entry->attributes & kJSPropertyAttributeReadOnly)
                    return;
                JSCallbackObject<Base>::putDirect(propertyName, value); // put as override property
                return;
            }
        }
    }
    
    return Base::put(exec, propertyName, value, slot);
}

template <class Base>
bool JSCallbackObject<Base>::deleteProperty(ExecState* exec, const Identifier& propertyName)
{
    JSContextRef ctx = toRef(exec);
    JSObjectRef thisRef = toRef(this);
    RefPtr<OpaqueJSString> propertyNameRef;
    
    for (JSClassRef jsClass = classRef(); jsClass; jsClass = jsClass->parentClass) {
        if (JSObjectDeletePropertyCallback deleteProperty = jsClass->deleteProperty) {
            if (!propertyNameRef)
                propertyNameRef = OpaqueJSString::create(propertyName.ustring());
            JSLock::DropAllLocks dropAllLocks(exec);
            if (deleteProperty(ctx, thisRef, propertyNameRef.get(), toRef(exec->exceptionSlot())))
                return true;
        }
        
        if (OpaqueJSClassStaticValuesTable* staticValues = jsClass->staticValues(exec)) {
            if (StaticValueEntry* entry = staticValues->get(propertyName.ustring().rep())) {
                if (entry->attributes & kJSPropertyAttributeDontDelete)
                    return false;
                return true;
            }
        }
        
        if (OpaqueJSClassStaticFunctionsTable* staticFunctions = jsClass->staticFunctions(exec)) {
            if (StaticFunctionEntry* entry = staticFunctions->get(propertyName.ustring().rep())) {
                if (entry->attributes & kJSPropertyAttributeDontDelete)
                    return false;
                return true;
            }
        }
    }
    
    return Base::deleteProperty(exec, propertyName);
}

template <class Base>
bool JSCallbackObject<Base>::deleteProperty(ExecState* exec, unsigned propertyName)
{
    return deleteProperty(exec, Identifier::from(exec, propertyName));
}

template <class Base>
ConstructType JSCallbackObject<Base>::getConstructData(ConstructData& constructData)
{
    for (JSClassRef jsClass = classRef(); jsClass; jsClass = jsClass->parentClass) {
        if (jsClass->callAsConstructor) {