/* * 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 V8LazyEventListener::getListenerFunction() { if (m_compiled) { ASSERT(m_listener.IsEmpty() || m_listener->IsFunction()); return m_listener.IsEmpty() ? v8::Local() : v8::Local::New(v8::Persistent::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 context = V8Proxy::GetContext(m_frame); // Bail out if we could not get the context. if (context.IsEmpty()) return v8::Local(); 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 // // . // 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 codeExternalString = v8ExternalString(code); v8::Handle script = V8Proxy::CompileScript(codeExternalString, m_frame->document()->url(), m_lineNumber - 1); if (!script.IsEmpty()) { V8Proxy* proxy = V8Proxy::retrieve(m_frame); ASSERT(proxy); v8::Local value = proxy->RunScript(script, false); if (!value.IsEmpty()) { ASSERT(value->IsFunction()); v8::Local listenerFunction = v8::Local::Cast(value); listenerFunction->SetName(v8::String::New(FromWebCoreString(m_functionName), m_functionName.length())); m_listener = v8::Persistent::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::Local::New(v8::Persistent::Cast(m_listener)); } v8::Local V8LazyEventListener::callListenerFunction(v8::Handle jsEvent, Event* event, bool isWindowEvent) { v8::Local handlerFunction = getWrappedListenerFunction(); v8::Local receiver = getReceiverObject(event, isWindowEvent); if (handlerFunction.IsEmpty() || receiver.IsEmpty()) return v8::Local(); v8::Handle parameters[1] = { jsEvent }; V8Proxy* proxy = V8Proxy::retrieve(m_frame); return proxy->CallFunction(handlerFunction, receiver, 1, parameters); } v8::Local V8LazyEventListener::getWrappedListenerFunction() { if (m_wrappedFunctionCompiled) { ASSERT(m_wrappedFunction.IsEmpty() || m_wrappedFunction->IsFunction()); return m_wrappedFunction.IsEmpty() ? v8::Local() : v8::Local::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 context = V8Proxy::GetContext(m_frame); // Bail out if we cannot get the context. if (context.IsEmpty()) return v8::Local(); 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 codeExternalString = v8ExternalString(code); v8::Handle script = V8Proxy::CompileScript(codeExternalString, m_frame->document()->url(), m_lineNumber - 4); if (!script.IsEmpty()) { V8Proxy* proxy = V8Proxy::retrieve(m_frame); ASSERT(proxy); v8::Local value = proxy->RunScript(script, false); if (!value.IsEmpty()) { ASSERT(value->IsFunction()); m_wrappedFunction = v8::Persistent::New(v8::Local::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::New(m_wrappedFunction); } } // namespace WebCore