V8CustomVoidCallback.cpp   [plain text]

/*
 * Copyright (C) 2009 Google Inc. All rights reserved.
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 * modification, are permitted provided that the following conditions are
 * met:
 * 
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
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 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "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 THE COPYRIGHT
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#include "config.h"
#include "V8CustomVoidCallback.h"

#include "ScriptExecutionContext.h"
#include "V8Binding.h"
#include "V8Proxy.h"

namespace WebCore {

V8CustomVoidCallback::V8CustomVoidCallback(v8::Local<v8::Object> callback, ScriptExecutionContext *context)
    : m_callback(v8::Persistent<v8::Object>::New(callback))
    , m_scriptExecutionContext(context)
    , m_worldContext(UseCurrentWorld)
{
}

V8CustomVoidCallback::~V8CustomVoidCallback()
{
    m_callback.Dispose();
}

void V8CustomVoidCallback::handleEvent()
{
    v8::HandleScope handleScope;

    v8::Handle<v8::Context> v8Context = toV8Context(m_scriptExecutionContext.get(), m_worldContext);
    if (v8Context.IsEmpty())
        return;

    v8::Context::Scope scope(v8Context);

    bool callbackReturnValue = false;
    invokeCallback(m_callback, 0, 0, callbackReturnValue, m_scriptExecutionContext.get());
}

bool invokeCallback(v8::Persistent<v8::Object> callback, int argc, v8::Handle<v8::Value> argv[], bool& callbackReturnValue, ScriptExecutionContext* scriptExecutionContext)
{
    return invokeCallback(callback, v8::Context::GetCurrent()->Global(), argc, argv, callbackReturnValue, scriptExecutionContext);
}

bool invokeCallback(v8::Persistent<v8::Object> callback, v8::Handle<v8::Object> thisObject, int argc, v8::Handle<v8::Value> argv[], bool& callbackReturnValue, ScriptExecutionContext* scriptExecutionContext)
{
    v8::TryCatch exceptionCatcher;
    exceptionCatcher.SetVerbose(true);

    v8::Local<v8::Function> callbackFunction;
    if (callback->IsFunction()) {
        callbackFunction = v8::Local<v8::Function>::New(v8::Persistent<v8::Function>::Cast(callback));
    } else if (callback->IsObject()) {
        v8::Local<v8::Value> handleEventFunction = callback->Get(v8::String::NewSymbol("handleEvent"));
        if (handleEventFunction->IsFunction())
            callbackFunction = v8::Local<v8::Function>::Cast(handleEventFunction);
    } else
        return false;

    if (callbackFunction.IsEmpty())
        return false;

    Frame* frame = scriptExecutionContext && scriptExecutionContext->isDocument() ? static_cast<Document*>(scriptExecutionContext)->frame() : 0;
    v8::Handle<v8::Value> result = V8Proxy::instrumentedCallFunction(frame, callbackFunction, thisObject, argc, argv);

    callbackReturnValue = !result.IsEmpty() && result->BooleanValue();
    return exceptionCatcher.HasCaught();
}

} // namespace WebCore