| /* |
| * 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 |
