HTMLConstructionSite.h 7.41 KB
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/*
 * Copyright (C) 2010 Google, Inc. All Rights Reserved.
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 * Copyright (C) 2011 Apple Inc. All rights reserved.
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 *
 * 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 GOOGLE 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 GOOGLE 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. 
 */

#ifndef HTMLConstructionSite_h
#define HTMLConstructionSite_h

#include "FragmentScriptingPermission.h"
#include "HTMLElementStack.h"
#include "HTMLFormattingElementList.h"
#include <wtf/Noncopyable.h>
#include <wtf/PassRefPtr.h>
#include <wtf/RefPtr.h>
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#include <wtf/Vector.h>

namespace WebCore {

struct HTMLConstructionSiteTask {
    HTMLConstructionSiteTask()
        : selfClosing(false)
    {
    }

    RefPtr<ContainerNode> parent;
    RefPtr<Node> nextChild;
    RefPtr<Node> child;
    bool selfClosing;
};

} // namespace WebCore

namespace WTF {
template<> struct VectorTraits<WebCore::HTMLConstructionSiteTask> : SimpleClassVectorTraits { };
} // namespace WTF
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namespace WebCore {

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enum WhitespaceMode {
    AllWhitespace,
    NotAllWhitespace,
    WhitespaceUnknown
};

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class AtomicHTMLToken;
class Document;
class Element;
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class HTMLFormElement;
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class HTMLConstructionSite {
    WTF_MAKE_NONCOPYABLE(HTMLConstructionSite);
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public:
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    HTMLConstructionSite(Document&, ParserContentPolicy, unsigned maximumDOMTreeDepth);
    HTMLConstructionSite(DocumentFragment&, ParserContentPolicy, unsigned maximumDOMTreeDepth);
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    ~HTMLConstructionSite();

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    void detach();
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    void executeQueuedTasks();
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    void setDefaultCompatibilityMode();
    void finishedParsing();

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    void insertDoctype(AtomicHTMLToken*);
    void insertComment(AtomicHTMLToken*);
    void insertCommentOnDocument(AtomicHTMLToken*);
    void insertCommentOnHTMLHtmlElement(AtomicHTMLToken*);
    void insertHTMLElement(AtomicHTMLToken*);
    void insertSelfClosingHTMLElement(AtomicHTMLToken*);
    void insertFormattingElement(AtomicHTMLToken*);
    void insertHTMLHeadElement(AtomicHTMLToken*);
    void insertHTMLBodyElement(AtomicHTMLToken*);
    void insertHTMLFormElement(AtomicHTMLToken*, bool isDemoted = false);
    void insertScriptElement(AtomicHTMLToken*);
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    void insertTextNode(const String&, WhitespaceMode = WhitespaceUnknown);
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    void insertForeignElement(AtomicHTMLToken*, const AtomicString& namespaceURI);
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    void insertHTMLHtmlStartTagBeforeHTML(AtomicHTMLToken*);
    void insertHTMLHtmlStartTagInBody(AtomicHTMLToken*);
    void insertHTMLBodyStartTagInBody(AtomicHTMLToken*);
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    PassRefPtr<HTMLStackItem> createElementFromSavedToken(HTMLStackItem*);
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    bool shouldFosterParent() const;
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    void fosterParent(PassRefPtr<Node>);
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    bool indexOfFirstUnopenFormattingElement(unsigned& firstUnopenElementIndex) const;
    void reconstructTheActiveFormattingElements();

    void generateImpliedEndTags();
    void generateImpliedEndTagsWithExclusion(const AtomicString& tagName);

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    bool inQuirksMode();

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    bool isEmpty() const { return !m_openElements.stackDepth(); }
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    HTMLElementStack::ElementRecord* currentElementRecord() const { return m_openElements.topRecord(); }
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    Element* currentElement() const { return m_openElements.top(); }
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    ContainerNode* currentNode() const { return m_openElements.topNode(); }
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    HTMLStackItem* currentStackItem() const { return m_openElements.topStackItem(); }
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    HTMLStackItem* oneBelowTop() const { return m_openElements.oneBelowTop(); }
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    Document& ownerDocumentForCurrentNode();
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    HTMLElementStack* openElements() const { return &m_openElements; }
    HTMLFormattingElementList* activeFormattingElements() const { return &m_activeFormattingElements; }
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    bool currentIsRootNode() { return m_openElements.topNode() == m_openElements.rootNode(); }
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    Element* head() const { return m_head->element(); }
    HTMLStackItem* headStackItem() const { return m_head.get(); }
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    void setForm(HTMLFormElement*);
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    HTMLFormElement* form() const { return m_form.get(); }
    PassRefPtr<HTMLFormElement> takeForm();
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    ParserContentPolicy parserContentPolicy() { return m_parserContentPolicy; }

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    class RedirectToFosterParentGuard {
        WTF_MAKE_NONCOPYABLE(RedirectToFosterParentGuard);
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    public:
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        RedirectToFosterParentGuard(HTMLConstructionSite& tree)
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            : m_tree(tree)
            , m_wasRedirectingBefore(tree.m_redirectAttachToFosterParent)
        {
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            m_tree.m_redirectAttachToFosterParent = true;
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        }

        ~RedirectToFosterParentGuard()
        {
            m_tree.m_redirectAttachToFosterParent = m_wasRedirectingBefore;
        }

    private:
        HTMLConstructionSite& m_tree;
        bool m_wasRedirectingBefore;
    };

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private:
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    // In the common case, this queue will have only one task because most
    // tokens produce only one DOM mutation.
    typedef Vector<HTMLConstructionSiteTask, 1> AttachmentQueue;
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    void setCompatibilityMode(Document::CompatibilityMode);
    void setCompatibilityModeFromDoctype(const String& name, const String& publicId, const String& systemId);

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    void attachLater(ContainerNode* parent, PassRefPtr<Node> child, bool selfClosing = false);
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    void findFosterSite(HTMLConstructionSiteTask&);
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    PassRefPtr<Element> createHTMLElement(AtomicHTMLToken*);
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    PassRefPtr<Element> createElement(AtomicHTMLToken*, const AtomicString& namespaceURI);
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    void mergeAttributesFromTokenIntoElement(AtomicHTMLToken*, Element*);
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    void dispatchDocumentElementAvailableIfNeeded();
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    Document* m_document;
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    // This is the root ContainerNode to which the parser attaches all newly
    // constructed nodes. It points to a DocumentFragment when parsing fragments
    // and a Document in all other cases.
    ContainerNode* m_attachmentRoot;
    
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    RefPtr<HTMLStackItem> m_head;
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    RefPtr<HTMLFormElement> m_form;
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    mutable HTMLElementStack m_openElements;
    mutable HTMLFormattingElementList m_activeFormattingElements;
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    AttachmentQueue m_attachmentQueue;

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    ParserContentPolicy m_parserContentPolicy;
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    bool m_isParsingFragment;
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    // http://www.whatwg.org/specs/web-apps/current-work/multipage/tokenization.html#parsing-main-intable
    // In the "in table" insertion mode, we sometimes get into a state where
    // "whenever a node would be inserted into the current node, it must instead
    // be foster parented."  This flag tracks whether we're in that state.
    bool m_redirectAttachToFosterParent;
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    unsigned m_maximumDOMTreeDepth;
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    bool m_inQuirksMode;
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};

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} // namespace WebCore
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#endif