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Unified Diff: third_party/WebKit/WebCore/bindings/v8/V8LazyEventListener.cpp

Issue 46097: WebKit merge 41660:41709 (WebKit side).... (Closed) Base URL: svn://chrome-svn/chrome/trunk/src/
Patch Set: Created 11 years, 9 months ago
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Index: third_party/WebKit/WebCore/bindings/v8/V8LazyEventListener.cpp
===================================================================
--- third_party/WebKit/WebCore/bindings/v8/V8LazyEventListener.cpp (revision 0)
+++ third_party/WebKit/WebCore/bindings/v8/V8LazyEventListener.cpp (revision 11711)
@@ -0,0 +1,196 @@
+/*
+ * 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.
+ String code = "(function (evt) {\n";
+
+ // 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
+ code.append(" with (this.ownerDocument ? this.ownerDocument : {}) {\n");
+ code.append(" with (this.form ? this.form : {}) {\n");
+ code.append(" with (this) {\n");
+ code.append(" return (function(evt){");
+ code.append(m_code);
+ code.append("\n}).call(this, evt);\n");
+ code.append(" }\n");
+ code.append(" }\n");
+ code.append(" }\n");
+ code.append("})");
+ 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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