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/*
* Copyright (C) 2001 Peter Kelly (pmk@post.com)
* Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All Rights Reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "config.h"
#include "JSLazyEventListener.h"
#include "Frame.h"
#include "JSNode.h"
#include <runtime/FunctionConstructor.h>
#include <runtime/JSLock.h>
#include <wtf/RefCountedLeakCounter.h>
using namespace JSC;
namespace WebCore {
#ifndef NDEBUG
static WTF::RefCountedLeakCounter eventListenerCounter("JSLazyEventListener");
#endif
JSLazyEventListener::JSLazyEventListener(const String& functionName, const String& eventParameterName, const String& code, JSDOMGlobalObject* globalObject, Node* node, int lineNumber)
: JSEventListener(0, globalObject, true)
, m_functionName(functionName)
, m_eventParameterName(eventParameterName)
, m_code(code)
, m_parsed(false)
, m_lineNumber(lineNumber)
, m_originalNode(node)
{
// We don't retain the original node because we assume it
// will stay alive as long as this handler object is around
// and we need to avoid a reference cycle. If JS transfers
// this handler to another node, parseCode will be called and
// then originalNode is no longer needed.
// A JSLazyEventListener can be created with a line number of zero when it is created with
// a setAttribute call from JavaScript, so make the line number 1 in that case.
if (m_lineNumber == 0)
m_lineNumber = 1;
#ifndef NDEBUG
eventListenerCounter.increment();
#endif
}
JSLazyEventListener::~JSLazyEventListener()
{
#ifndef NDEBUG
eventListenerCounter.decrement();
#endif
}
JSObject* JSLazyEventListener::jsFunction() const
{
parseCode();
return m_jsFunction;
}
void JSLazyEventListener::parseCode() const
{
if (m_parsed)
return;
ScriptExecutionContext* executionContext = m_globalObject->scriptExecutionContext();
ASSERT(executionContext);
if (!executionContext)
return;
if (executionContext->isDocument()) {
JSDOMWindow* window = static_cast<JSDOMWindow*>(m_globalObject);
Frame* frame = window->impl()->frame();
if (!frame)
return;
// FIXME: Is this check needed for non-Document contexts?
ScriptController* script = frame->script();
if (!script->isEnabled() || script->isPaused())
return;
}
m_parsed = true;
ExecState* exec = m_globalObject->globalExec();
MarkedArgumentBuffer args;
UString sourceURL(executionContext->url().string().operator UString());
args.append(jsNontrivialString(exec, m_eventParameterName));
args.append(jsString(exec, m_code));
// FIXME: Passing the document's URL to construct is not always correct, since this event listener might
// have been added with setAttribute from a script, and we should pass String() in that case.
m_jsFunction = constructFunction(exec, args, Identifier(exec, m_functionName), sourceURL, m_lineNumber); // FIXME: is globalExec ok?
JSFunction* listenerAsFunction = static_cast<JSFunction*>(m_jsFunction);
if (exec->hadException()) {
exec->clearException();
// failed to parse, so let's just make this listener a no-op
m_jsFunction = 0;
} else if (m_originalNode) {
// Add the event's home element to the scope
// (and the document, and the form - see JSHTMLElement::eventHandlerScope)
ScopeChain scope = listenerAsFunction->scope();
JSValue thisObj = toJS(exec, m_globalObject, m_originalNode);
if (thisObj.isObject()) {
static_cast<JSNode*>(asObject(thisObj))->pushEventHandlerScope(exec, scope);
listenerAsFunction->setScope(scope);
}
}
// Since we only parse once, there's no need to keep data used for parsing around anymore.
m_functionName = String();
m_code = String();
m_eventParameterName = String();
}
} // namespace WebCore
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