/*
* Copyright (C) 2007, 2009, 2010 Apple 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:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``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 APPLE COMPUTER, INC. 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 "JSNode.h"
#include "Attr.h"
#include "CDATASection.h"
#include "Comment.h"
#include "Document.h"
#include "DocumentFragment.h"
#include "DocumentType.h"
#include "Entity.h"
#include "EntityReference.h"
#include "ExceptionCode.h"
#include "HTMLAudioElement.h"
#include "HTMLCanvasElement.h"
#include "HTMLElement.h"
#include "HTMLFrameElementBase.h"
#include "HTMLImageElement.h"
#include "HTMLLinkElement.h"
#include "HTMLNames.h"
#include "HTMLScriptElement.h"
#include "HTMLStyleElement.h"
#include "JSAttr.h"
#include "JSCDATASection.h"
#include "JSComment.h"
#include "JSDOMBinding.h"
#include "JSDocument.h"
#include "JSDocumentFragment.h"
#include "JSDocumentType.h"
#include "JSEntity.h"
#include "JSEntityReference.h"
#include "JSEventListener.h"
#include "JSHTMLElement.h"
#include "JSHTMLElementWrapperFactory.h"
#include "JSNotation.h"
#include "JSProcessingInstruction.h"
#include "JSText.h"
#include "Node.h"
#include "Notation.h"
#include "ProcessingInstruction.h"
#include "RegisteredEventListener.h"
#include "StyleSheet.h"
#include "StyledElement.h"
#include "Text.h"
#include <wtf/PassRefPtr.h>
#include <wtf/RefPtr.h>
#if ENABLE(SVG)
#include "JSSVGElementWrapperFactory.h"
#include "SVGElement.h"
#endif
using namespace JSC;
namespace WebCore {
using namespace HTMLNames;
static bool isObservable(JSNode* jsNode, Node* node, DOMWrapperWorld* world)
{
// Certain conditions implicitly make existence of a JS DOM node wrapper observable
// through the DOM, even if no explicit reference to it remains.
// The DOM doesn't know how to keep a tree of nodes alive without the root
// being explicitly referenced. So, we artificially treat the root of
// every tree as observable.
// FIXME: Resolve this lifetime issue in the DOM, and remove this inefficiency.
if (!node->parentNode())
return true;
// If a node is in the document, and its wrapper has custom properties,
// the wrapper is observable because future access to the node through the
// DOM must reflect those properties.
if (jsNode->hasCustomProperties())
return true;
// If a node is in the document, and has event listeners, its wrapper is
// observable because its wrapper is responsible for marking those event listeners.
if (node->hasEventListeners())
return true;
// If a node owns another object with a wrapper with custom properties,
// the wrapper must be treated as observable, because future access to
// those objects through the DOM must reflect those properties.
// FIXME: It would be better if this logic could be in the node next to
// the custom markChildren functions rather than here.
// Note that for some compound objects like stylesheets and CSSStyleDeclarations,
// we don't descend to check children for custom properties, and just conservatively
// keep the node wrappers protecting them alive.
if (node->isElementNode()) {
if (node->isStyledElement()) {
if (CSSMutableStyleDeclaration* style = static_cast<StyledElement*>(node)->inlineStyleDecl()) {
if (world->m_wrappers.get(style))
return true;
}
}
if (static_cast<Element*>(node)->hasTagName(canvasTag)) {
if (CanvasRenderingContext* context = static_cast<HTMLCanvasElement*>(node)->renderingContext()) {
if (JSDOMWrapper* wrapper = world->m_wrappers.get(context).get()) {
if (wrapper->hasCustomProperties())
return true;
}
}
} else if (static_cast<Element*>(node)->hasTagName(linkTag)) {
if (StyleSheet* sheet = static_cast<HTMLLinkElement*>(node)->sheet()) {
if (world->m_wrappers.get(sheet))
return true;
}
} else if (static_cast<Element*>(node)->hasTagName(styleTag)) {
if (StyleSheet* sheet = static_cast<HTMLStyleElement*>(node)->sheet()) {
if (world->m_wrappers.get(sheet))
return true;
}
}
} else if (node->nodeType() == Node::PROCESSING_INSTRUCTION_NODE) {
if (StyleSheet* sheet = static_cast<ProcessingInstruction*>(node)->sheet()) {
if (world->m_wrappers.get(sheet))
return true;
}
}
return false;
}
static inline bool isReachableFromDOM(JSNode* jsNode, Node* node, DOMWrapperWorld* world, MarkStack& markStack)
{
if (!node->inDocument()) {
// If a wrapper is the last reference to an image or script element
// that is loading but not in the document, the wrapper is observable
// because it is the only thing keeping the image element alive, and if
// the image element is destroyed, its load event will not fire.
// FIXME: The DOM should manage this issue without the help of JavaScript wrappers.
if (node->hasTagName(imgTag) && !static_cast<HTMLImageElement*>(node)->haveFiredLoadEvent())
return true;
if (node->hasTagName(scriptTag) && !static_cast<HTMLScriptElement*>(node)->haveFiredLoadEvent())
return true;
#if ENABLE(VIDEO)
if (node->hasTagName(audioTag) && !static_cast<HTMLAudioElement*>(node)->paused())
return true;
#endif
// If a node is firing event listeners, its wrapper is observable because
// its wrapper is responsible for marking those event listeners.
if (node->isFiringEventListeners())
return true;
}
return isObservable(jsNode, node, world) && markStack.containsOpaqueRoot(root(node));
}
bool JSNodeOwner::isReachableFromOpaqueRoots(JSC::Handle<JSC::Unknown> handle, void* context, MarkStack& markStack)
{
JSNode* jsNode = static_cast<JSNode*>(handle.get().asCell());
DOMWrapperWorld* world = static_cast<DOMWrapperWorld*>(context);
return isReachableFromDOM(jsNode, jsNode->impl(), world, markStack);
}
void JSNodeOwner::finalize(JSC::Handle<JSC::Unknown> handle, void* context)
{
JSNode* jsNode = static_cast<JSNode*>(handle.get().asCell());
DOMWrapperWorld* world = static_cast<DOMWrapperWorld*>(context);
uncacheWrapper(world, jsNode->impl(), jsNode);
}
JSValue JSNode::insertBefore(ExecState* exec)
{
Node* imp = static_cast<Node*>(impl());
ExceptionCode ec = 0;
bool ok = imp->insertBefore(toNode(exec->argument(0)), toNode(exec->argument(1)), ec, true);
setDOMException(exec, ec);
if (ok)
return exec->argument(0);
return jsNull();
}
JSValue JSNode::replaceChild(ExecState* exec)
{
Node* imp = static_cast<Node*>(impl());
ExceptionCode ec = 0;
bool ok = imp->replaceChild(toNode(exec->argument(0)), toNode(exec->argument(1)), ec, true);
setDOMException(exec, ec);
if (ok)
return exec->argument(1);
return jsNull();
}
JSValue JSNode::removeChild(ExecState* exec)
{
Node* imp = static_cast<Node*>(impl());
ExceptionCode ec = 0;
bool ok = imp->removeChild(toNode(exec->argument(0)), ec);
setDOMException(exec, ec);
if (ok)
return exec->argument(0);
return jsNull();
}
JSValue JSNode::appendChild(ExecState* exec)
{
Node* imp = static_cast<Node*>(impl());
ExceptionCode ec = 0;
bool ok = imp->appendChild(toNode(exec->argument(0)), ec, true);
setDOMException(exec, ec);
if (ok)
return exec->argument(0);
return jsNull();
}
ScopeChainNode* JSNode::pushEventHandlerScope(ExecState*, ScopeChainNode* node) const
{
return node;
}
void JSNode::markChildren(MarkStack& markStack)
{
Base::markChildren(markStack);
Node* node = m_impl.get();
node->markJSEventListeners(markStack);
markStack.addOpaqueRoot(root(node));
}
static ALWAYS_INLINE JSValue createWrapperInline(ExecState* exec, JSDOMGlobalObject* globalObject, Node* node)
{
ASSERT(node);
ASSERT(!getCachedWrapper(currentWorld(exec), node));
JSNode* wrapper;
switch (node->nodeType()) {
case Node::ELEMENT_NODE:
if (node->isHTMLElement())
wrapper = createJSHTMLWrapper(exec, globalObject, toHTMLElement(node));
#if ENABLE(SVG)
else if (node->isSVGElement())
wrapper = createJSSVGWrapper(exec, globalObject, static_cast<SVGElement*>(node));
#endif
else
wrapper = CREATE_DOM_NODE_WRAPPER(exec, globalObject, Element, node);
break;
case Node::ATTRIBUTE_NODE:
wrapper = CREATE_DOM_NODE_WRAPPER(exec, globalObject, Attr, node);
break;
case Node::TEXT_NODE:
wrapper = CREATE_DOM_NODE_WRAPPER(exec, globalObject, Text, node);
break;
case Node::CDATA_SECTION_NODE:
wrapper = CREATE_DOM_NODE_WRAPPER(exec, globalObject, CDATASection, node);
break;
case Node::ENTITY_NODE:
wrapper = CREATE_DOM_NODE_WRAPPER(exec, globalObject, Entity, node);
break;
case Node::PROCESSING_INSTRUCTION_NODE:
wrapper = CREATE_DOM_NODE_WRAPPER(exec, globalObject, ProcessingInstruction, node);
break;
case Node::COMMENT_NODE:
wrapper = CREATE_DOM_NODE_WRAPPER(exec, globalObject, Comment, node);
break;
case Node::DOCUMENT_NODE:
// we don't want to cache the document itself in the per-document dictionary
return toJS(exec, globalObject, static_cast<Document*>(node));
case Node::DOCUMENT_TYPE_NODE:
wrapper = CREATE_DOM_NODE_WRAPPER(exec, globalObject, DocumentType, node);
break;
case Node::NOTATION_NODE:
wrapper = CREATE_DOM_NODE_WRAPPER(exec, globalObject, Notation, node);
break;
case Node::DOCUMENT_FRAGMENT_NODE:
wrapper = CREATE_DOM_NODE_WRAPPER(exec, globalObject, DocumentFragment, node);
break;
case Node::ENTITY_REFERENCE_NODE:
wrapper = CREATE_DOM_NODE_WRAPPER(exec, globalObject, EntityReference, node);
break;
default:
wrapper = CREATE_DOM_NODE_WRAPPER(exec, globalObject, Node, node);
}
return wrapper;
}
JSValue createWrapper(ExecState* exec, JSDOMGlobalObject* globalObject, Node* node)
{
return createWrapperInline(exec, globalObject, node);
}
JSValue toJSNewlyCreated(ExecState* exec, JSDOMGlobalObject* globalObject, Node* node)
{
if (!node)
return jsNull();
return createWrapperInline(exec, globalObject, node);
}
} // namespace WebCore