WebCore/html/LegacyHTMLTreeBuilder.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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/*
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    Copyright (C) 1997 Martin Jones (mjones@kde.org)
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              (C) 1997 Torben Weis (weis@kde.org)
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              (C) 1998 Waldo Bastian (bastian@kde.org)
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              (C) 1999 Lars Knoll (knoll@kde.org)
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    Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Library General Public
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    License as published by the Free Software Foundation; either
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    version 2 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Library General Public License for more details.
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    You should have received a copy of the GNU Library General Public License
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    along with this library; see the file COPYING.LIB.  If not, write to
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    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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    Boston, MA 02110-1301, USA.
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*/
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#ifndef LegacyHTMLTreeBuilder_h
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#define LegacyHTMLTreeBuilder_h
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#include "FragmentScriptingPermission.h"
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#include "HTMLParserErrorCodes.h"
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#include "QualifiedName.h"
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#include <wtf/Forward.h>
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#include <wtf/OwnPtr.h>
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#include <wtf/RefPtr.h>
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namespace WebCore {
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class DoctypeToken;
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class Document;
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class DocumentFragment;
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class HTMLDocument;
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class HTMLFormElement;
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class HTMLHeadElement;
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class HTMLMapElement;
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class HTMLParserQuirks;
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class Node;
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struct HTMLStackElem;
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struct Token;
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/**
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 * The parser for HTML. It receives a stream of tokens from the LegacyHTMLDocumentParser, and
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 * builds up the Document structure from it.
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 */
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class LegacyHTMLTreeBuilder : public Noncopyable {
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public:
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    LegacyHTMLTreeBuilder(HTMLDocument*, bool reportErrors);
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    LegacyHTMLTreeBuilder(DocumentFragment*, FragmentScriptingPermission = FragmentScriptingAllowed);
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    virtual ~LegacyHTMLTreeBuilder();
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    /**
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     * parses one token delivered by the tokenizer
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     */
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    PassRefPtr<Node> parseToken(Token*);
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    // Parses a doctype token.
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    void parseDoctypeToken(DoctypeToken*);
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    /**
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     * tokenizer says it's not going to be sending us any more tokens
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     */
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    void finished();
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    /**
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     * resets the parser
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     */
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    void reset();
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    bool skipMode() const { return !m_skipModeTag.isNull(); }
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    bool isHandlingResidualStyleAcrossBlocks() const { return m_handlingResidualStyleAcrossBlocks; }
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private:
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    void setCurrent(Node*);
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    void derefCurrent();
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    void setSkipMode(const QualifiedName& qName) { m_skipModeTag = qName.localName(); }
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    PassRefPtr<Node> getNode(Token*);
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    bool bodyCreateErrorCheck(Token*, RefPtr<Node>&);
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    bool canvasCreateErrorCheck(Token*, RefPtr<Node>&);
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    bool colCreateErrorCheck(Token*, RefPtr<Node>&);
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    bool commentCreateErrorCheck(Token*, RefPtr<Node>&);
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    bool ddCreateErrorCheck(Token*, RefPtr<Node>&);
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    bool dtCreateErrorCheck(Token*, RefPtr<Node>&);
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    bool formCreateErrorCheck(Token*, RefPtr<Node>&);
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    bool framesetCreateErrorCheck(Token*, RefPtr<Node>&);
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    bool headCreateErrorCheck(Token*, RefPtr<Node>&);
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    bool iframeCreateErrorCheck(Token*, RefPtr<Node>&);
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    bool isindexCreateErrorCheck(Token*, RefPtr<Node>&);
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    bool mapCreateErrorCheck(Token*, RefPtr<Node>&);
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    bool nestedCreateErrorCheck(Token*, RefPtr<Node>&);
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    bool nestedPCloserCreateErrorCheck(Token*, RefPtr<Node>&);
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    bool nestedStyleCreateErrorCheck(Token*, RefPtr<Node>&);
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    bool noembedCreateErrorCheck(Token*, RefPtr<Node>&);
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    bool noframesCreateErrorCheck(Token*, RefPtr<Node>&);
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    bool nolayerCreateErrorCheck(Token*, RefPtr<Node>&);
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    bool noscriptCreateErrorCheck(Token*, RefPtr<Node>&);
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    bool pCloserCreateErrorCheck(Token*, RefPtr<Node>&);
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    bool pCloserStrictCreateErrorCheck(Token*, RefPtr<Node>&);
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    bool rpCreateErrorCheck(Token*, RefPtr<Node>&);
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    bool rtCreateErrorCheck(Token*, RefPtr<Node>&);
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    bool selectCreateErrorCheck(Token*, RefPtr<Node>&);
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    bool tableCellCreateErrorCheck(Token*, RefPtr<Node>&);
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    bool tableSectionCreateErrorCheck(Token*, RefPtr<Node>&);
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    bool textCreateErrorCheck(Token*, RefPtr<Node>&);
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    void processCloseTag(Token*);
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    void limitDepth(int tagPriority);
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    bool insertNodeAfterLimitDepth(Node*, bool flat = false);
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    bool insertNode(Node*, bool flat = false);
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    bool handleError(Node*, bool flat, const AtomicString& localName, int tagPriority);
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    void pushBlock(const AtomicString& tagName, int level);
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    void popBlock(const AtomicString& tagName, bool reportErrors = false);
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    void popBlock(const QualifiedName& qName, bool reportErrors = false) { return popBlock(qName.localName(), reportErrors); } // Convenience function for readability.
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    void popOneBlock();
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    void moveOneBlockToStack(HTMLStackElem*& head);
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    inline HTMLStackElem* popOneBlockCommon();
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    void popInlineBlocks();
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    void freeBlock();
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    void createHead();
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    static bool isResidualStyleTag(const AtomicString& tagName);
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    static bool isAffectedByResidualStyle(const AtomicString& tagName);
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    void handleResidualStyleCloseTagAcrossBlocks(HTMLStackElem*);
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    void reopenResidualStyleTags(HTMLStackElem*, Node* malformedTableParent);
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    bool allowNestedRedundantTag(const AtomicString& tagName);
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    static bool isHeadingTag(const AtomicString& tagName);
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    bool isInline(Node*) const;
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    void startBody(); // inserts the isindex element
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    PassRefPtr<Node> handleIsindex(Token*);
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    void checkIfHasPElementInScope();
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    bool hasPElementInScope()
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    {
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        if (m_hasPElementInScope == Unknown)
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            checkIfHasPElementInScope();
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        return m_hasPElementInScope == InScope;
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    }
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    void reportError(HTMLParserErrorCode errorCode, const AtomicString* tagName1 = 0, const AtomicString* tagName2 = 0, bool closeTags = false)
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    { if (!m_reportErrors) return; reportErrorToConsole(errorCode, tagName1, tagName2, closeTags); }
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    void reportErrorToConsole(HTMLParserErrorCode, const AtomicString* tagName1, const AtomicString* tagName2, bool closeTags);
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    Document* m_document;
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    // The currently active element (the one new elements will be added to). Can be a document fragment, a document or an element.
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    Node* m_current;
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    // We can't ref a document, but we don't want to constantly check if a node is a document just to decide whether to deref.
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    bool m_didRefCurrent;
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    HTMLStackElem* m_blockStack;
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    // The number of tags with priority minBlockLevelTagPriority or higher
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    // currently in m_blockStack. The parser enforces a cap on this value by
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    // adding such new elements as siblings instead of children once it is reached.
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    size_t m_blocksInStack;
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    // Depth of the tree.
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    unsigned m_treeDepth;
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    enum ElementInScopeState { NotInScope, InScope, Unknown }; 
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    ElementInScopeState m_hasPElementInScope;
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    RefPtr<HTMLFormElement> m_currentFormElement; // currently active form
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    RefPtr<HTMLMapElement> m_currentMapElement; // current map
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    RefPtr<HTMLHeadElement> m_head; // head element; needed for HTML which defines <base> after </head>
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    RefPtr<Node> m_isindexElement; // a possible <isindex> element in the head
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    bool m_inBody;
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    bool m_haveContent;
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    bool m_haveFrameSet;
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    AtomicString m_skipModeTag; // tells the parser to discard all tags until it reaches the one specified
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    bool m_isParsingFragment;
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    bool m_reportErrors;
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    bool m_handlingResidualStyleAcrossBlocks;
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    int m_inStrayTableContent;
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    FragmentScriptingPermission m_scriptingPermission;
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    OwnPtr<HTMLParserQuirks> m_parserQuirks;
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};
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#if defined(BUILDING_ON_LEOPARD) || defined(BUILDING_ON_TIGER)
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bool shouldCreateImplicitHead(Document*);
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#else
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inline bool shouldCreateImplicitHead(Document*) { return true; }
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#endif
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// Converts the specified string to a floating number.
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// If the conversion fails, the return value is false. Take care that leading or trailing unnecessary characters make failures.  This returns false for an empty string input.
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// The double* parameter may be 0.
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bool parseToDoubleForNumberType(const String&, double*);
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// Converts the specified number to a string. This is an implementation of
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// HTML5's "algorithm to convert a number to a string" for NUMBER/RANGE types.
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String serializeForNumberType(double);
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}
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#endif // LegacyHTMLTreeBuilder_h