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/*
* Copyright (C) 2006, 2007, 2008, 2009 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* 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.
* * 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.
* * Neither the name of Google Inc. nor the names of its
* 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
* OWNER 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 "config.h"
#include "V8LazyEventListener.h"
#include "Frame.h"
#include "V8Binding.h"
#include "V8HiddenPropertyName.h"
#include "V8Proxy.h"
#include "WorldContextHandle.h"
#include <wtf/StdLibExtras.h>
namespace WebCore {
V8LazyEventListener::V8LazyEventListener(const String& functionName, bool isSVGEvent, const String& code, const String sourceURL, const TextPosition0& position, const WorldContextHandle& worldContext)
: V8AbstractEventListener(true, worldContext)
, m_functionName(functionName)
, m_isSVGEvent(isSVGEvent)
, m_code(code)
, m_sourceURL(sourceURL)
, m_position(position)
{
}
v8::Local<v8::Value> V8LazyEventListener::callListenerFunction(ScriptExecutionContext* context, v8::Handle<v8::Value> jsEvent, Event* event)
{
v8::Local<v8::Object> listenerObject = getListenerObject(context);
if (listenerObject.IsEmpty())
return v8::Local<v8::Value>();
v8::Local<v8::Function> handlerFunction = v8::Local<v8::Function>::Cast(listenerObject);
v8::Local<v8::Object> receiver = getReceiverObject(event);
if (handlerFunction.IsEmpty() || receiver.IsEmpty())
return v8::Local<v8::Value>();
v8::Handle<v8::Value> parameters[1] = { jsEvent };
if (V8Proxy* proxy = V8Proxy::retrieve(context))
return proxy->callFunction(handlerFunction, receiver, 1, parameters);
return v8::Local<v8::Value>();
}
static v8::Handle<v8::Value> V8LazyEventListenerToString(const v8::Arguments& args)
{
return args.Holder()->GetHiddenValue(V8HiddenPropertyName::toStringString());
}
void V8LazyEventListener::prepareListenerObject(ScriptExecutionContext* context)
{
if (hasExistingListenerObject())
return;
v8::HandleScope handleScope;
V8Proxy* proxy = V8Proxy::retrieve(context);
if (!proxy)
return;
// Use the outer scope to hold context.
v8::Local<v8::Context> v8Context = worldContext().adjustedContext(proxy);
// Bail out if we cannot get the context.
if (v8Context.IsEmpty())
return;
v8::Context::Scope scope(v8Context);
// FIXME: cache the wrapper function.
// Nodes other than the document object, when executing inline event handlers push document, form, and the target node on the scope chain.
// We do this by using 'with' statement.
// See chrome/fast/forms/form-action.html
// chrome/fast/forms/selected-index-value.html
// base/fast/overflow/onscroll-layer-self-destruct.html
//
// Don't use new lines so that lines in the modified handler
// have the same numbers as in the original code.
String code = "(function (evt) {" \
"with (this.ownerDocument ? this.ownerDocument : {}) {" \
"with (this.form ? this.form : {}) {" \
"with (this) {" \
"return (function(evt){";
code.append(m_code);
// Insert '\n' otherwise //-style comments could break the handler.
code.append( "\n}).call(this, evt);}}}})");
v8::Handle<v8::String> codeExternalString = v8ExternalString(code);
v8::Handle<v8::Script> script = V8Proxy::compileScript(codeExternalString, m_sourceURL, m_position);
if (!script.IsEmpty()) {
v8::Local<v8::Value> value = proxy->runScript(script, false);
if (!value.IsEmpty()) {
ASSERT(value->IsFunction());
v8::Local<v8::Function> wrappedFunction = v8::Local<v8::Function>::Cast(value);
// Change the toString function on the wrapper function to avoid it
// returning the source for the actual wrapper function. Instead it
// returns source for a clean wrapper function with the event
// argument wrapping the event source code. The reason for this is
// that some web sites use toString on event functions and eval the
// source returned (sometimes a RegExp is applied as well) for some
// other use. That fails miserably if the actual wrapper source is
// returned.
DEFINE_STATIC_LOCAL(v8::Persistent<v8::FunctionTemplate>, toStringTemplate, ());
if (toStringTemplate.IsEmpty())
toStringTemplate = v8::Persistent<v8::FunctionTemplate>::New(v8::FunctionTemplate::New(V8LazyEventListenerToString));
v8::Local<v8::Function> toStringFunction;
if (!toStringTemplate.IsEmpty())
toStringFunction = toStringTemplate->GetFunction();
if (!toStringFunction.IsEmpty()) {
String toStringResult = "function ";
toStringResult.append(m_functionName);
toStringResult.append("(");
toStringResult.append(m_isSVGEvent ? "evt" : "event");
toStringResult.append(") {\n ");
toStringResult.append(m_code);
toStringResult.append("\n}");
wrappedFunction->SetHiddenValue(V8HiddenPropertyName::toStringString(), v8ExternalString(toStringResult));
wrappedFunction->Set(v8::String::New("toString"), toStringFunction);
}
wrappedFunction->SetName(v8::String::New(fromWebCoreString(m_functionName), m_functionName.length()));
setListenerObject(wrappedFunction);
}
}
}
} // namespace WebCore
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