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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 "V8Proxy.h"
namespace WebCore {
V8LazyEventListener::V8LazyEventListener(Frame *frame, const String& code, const String& functionName)
: V8AbstractEventListener(frame, true)
, m_code(code)
, m_functionName(functionName)
, m_compiled(false)
, m_wrappedFunctionCompiled(false)
{
}
V8LazyEventListener::~V8LazyEventListener()
{
disposeListenerObject();
// Dispose wrapped function
if (!m_wrappedFunction.IsEmpty()) {
#ifndef NDEBUG
V8Proxy::UnregisterGlobalHandle(this, m_wrappedFunction);
#endif
m_wrappedFunction.Dispose();
m_wrappedFunction.Clear();
}
}
v8::Local<v8::Function> V8LazyEventListener::getListenerFunction()
{
if (m_compiled) {
ASSERT(m_listener.IsEmpty() || m_listener->IsFunction());
return m_listener.IsEmpty() ? v8::Local<v8::Function>() : v8::Local<v8::Function>::New(v8::Persistent<v8::Function>::Cast(m_listener));
}
m_compiled = true;
ASSERT(m_frame);
{
// Switch to the context of m_frame.
v8::HandleScope handleScope;
// Use the outer scope to hold context.
v8::Handle<v8::Context> context = V8Proxy::GetContext(m_frame);
// Bail out if we could not get the context.
if (context.IsEmpty())
return v8::Local<v8::Function>();
v8::Context::Scope scope(context);
// Wrap function around the event code. The parenthesis around the function are needed so that evaluating the code yields
// the function value. Without the parenthesis the function value is thrown away.
// Make it an anonymous function to avoid name conflict for cases like
// <body onload='onload()'>
// <script> function onload() { alert('hi'); } </script>.
// Set function name to function object instead.
// See issue 944690.
//
// The ECMAScript spec says (very obliquely) that the parameter to an event handler is named "evt".
String code = "(function (evt) {\n";
code.append(m_code);
code.append("\n})");
v8::Handle<v8::String> codeExternalString = v8ExternalString(code);
v8::Handle<v8::Script> script = V8Proxy::CompileScript(codeExternalString, m_frame->document()->url(), m_lineNumber - 1);
if (!script.IsEmpty()) {
V8Proxy* proxy = V8Proxy::retrieve(m_frame);
ASSERT(proxy);
v8::Local<v8::Value> value = proxy->RunScript(script, false);
if (!value.IsEmpty()) {
ASSERT(value->IsFunction());
v8::Local<v8::Function> listenerFunction = v8::Local<v8::Function>::Cast(value);
listenerFunction->SetName(v8::String::New(FromWebCoreString(m_functionName), m_functionName.length()));
m_listener = v8::Persistent<v8::Function>::New(listenerFunction);
#ifndef NDEBUG
V8Proxy::RegisterGlobalHandle(EVENT_LISTENER, this, m_listener);
#endif
}
}
}
ASSERT(m_listener.IsEmpty() || m_listener->IsFunction());
return m_listener.IsEmpty() ? v8::Local<v8::Function>() : v8::Local<v8::Function>::New(v8::Persistent<v8::Function>::Cast(m_listener));
}
v8::Local<v8::Value> V8LazyEventListener::callListenerFunction(v8::Handle<v8::Value> jsEvent, Event* event, bool isWindowEvent)
{
v8::Local<v8::Function> handlerFunction = getWrappedListenerFunction();
v8::Local<v8::Object> receiver = getReceiverObject(event, isWindowEvent);
if (handlerFunction.IsEmpty() || receiver.IsEmpty())
return v8::Local<v8::Value>();
v8::Handle<v8::Value> parameters[1] = { jsEvent };
V8Proxy* proxy = V8Proxy::retrieve(m_frame);
return proxy->CallFunction(handlerFunction, receiver, 1, parameters);
}
v8::Local<v8::Function> V8LazyEventListener::getWrappedListenerFunction()
{
if (m_wrappedFunctionCompiled) {
ASSERT(m_wrappedFunction.IsEmpty() || m_wrappedFunction->IsFunction());
return m_wrappedFunction.IsEmpty() ? v8::Local<v8::Function>() : v8::Local<v8::Function>::New(m_wrappedFunction);
}
m_wrappedFunctionCompiled = true;
{
// Switch to the context of m_frame.
v8::HandleScope handleScope;
// Use the outer scope to hold context.
v8::Handle<v8::Context> context = V8Proxy::GetContext(m_frame);
// Bail out if we cannot get the context.
if (context.IsEmpty())
return v8::Local<v8::Function>();
v8::Context::Scope scope(context);
// 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
String code = "(function (evt) {\n" \
" with (this.ownerDocument ? this.ownerDocument : {}) {\n" \
" with (this.form ? this.form : {}) {\n" \
" with (this) {\n" \
" return (function(evt){\n";
code.append(m_code);
code.append( "\n" \
"}).call(this, evt);\n" \
" }\n" \
" }\n" \
" }\n" \
"})");
v8::Handle<v8::String> codeExternalString = v8ExternalString(code);
v8::Handle<v8::Script> script = V8Proxy::CompileScript(codeExternalString, m_frame->document()->url(), m_lineNumber - 4);
if (!script.IsEmpty()) {
V8Proxy* proxy = V8Proxy::retrieve(m_frame);
ASSERT(proxy);
v8::Local<v8::Value> value = proxy->RunScript(script, false);
if (!value.IsEmpty()) {
ASSERT(value->IsFunction());
m_wrappedFunction = v8::Persistent<v8::Function>::New(v8::Local<v8::Function>::Cast(value));
#ifndef NDEBUG
V8Proxy::RegisterGlobalHandle(EVENT_LISTENER, this, m_wrappedFunction);
#endif
m_wrappedFunction->SetName(v8::String::New(fromWebCoreString(m_functionName), m_functionName.length()));
}
}
}
return v8::Local<v8::Function>::New(m_wrappedFunction);
}
} // namespace WebCore
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