/platform/external/webkit/WebCore/bindings/v8/V8LazyEventListener.cpp
https://github.com/aharish/totoro-gb-opensource-update2 · C++ · 158 lines · 86 code · 23 blank · 49 comment · 12 complexity · 1b7fd6c9b447ffb23bea5094586df0c5 MD5 · raw file
- /*
- * 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, int lineNumber, int columnNumber, const WorldContextHandle& worldContext)
- : V8AbstractEventListener(true, worldContext)
- , m_functionName(functionName)
- , m_isSVGEvent(isSVGEvent)
- , m_code(code)
- , m_sourceURL(sourceURL)
- , m_lineNumber(lineNumber)
- , m_columnNumber(columnNumber)
- {
- }
- 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_lineNumber);
- 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