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      1 /*
      2  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #ifndef PreloadScanner_h
     27 #define PreloadScanner_h
     28 
     29 #include "AtomicString.h"
     30 #include "SegmentedString.h"
     31 #include <wtf/Noncopyable.h>
     32 #include <wtf/Vector.h>
     33 
     34 namespace WebCore {
     35 
     36     class CachedResource;
     37     class CachedResourceClient;
     38     class Document;
     39 
     40     class PreloadScanner : public Noncopyable {
     41     public:
     42         PreloadScanner(Document*);
     43         ~PreloadScanner();
     44         void begin();
     45         void write(const SegmentedString&);
     46         void end();
     47         bool inProgress() const { return m_inProgress; }
     48 
     49         bool scanningBody() const;
     50 
     51         static unsigned consumeEntity(SegmentedString&, bool& notEnoughCharacters);
     52 
     53     private:
     54         void tokenize(const SegmentedString&);
     55         void reset();
     56 
     57         void emitTag();
     58         void emitCharacter(UChar);
     59 
     60         void tokenizeCSS(UChar);
     61         void emitCSSRule();
     62 
     63         void processAttribute();
     64 
     65 
     66         void clearLastCharacters();
     67         void rememberCharacter(UChar);
     68         bool lastCharactersMatch(const char*, unsigned count) const;
     69 
     70         bool m_inProgress;
     71         SegmentedString m_source;
     72 
     73         enum State {
     74             Data,
     75             EntityData,
     76             TagOpen,
     77             CloseTagOpen,
     78             TagName,
     79             BeforeAttributeName,
     80             AttributeName,
     81             AfterAttributeName,
     82             BeforeAttributeValue,
     83             AttributeValueDoubleQuoted,
     84             AttributeValueSingleQuoted,
     85             AttributeValueUnquoted,
     86             EntityInAttributeValue,
     87             BogusComment,
     88             MarkupDeclarationOpen,
     89             CommentStart,
     90             CommentStartDash,
     91             Comment,
     92             CommentEndDash,
     93             CommentEnd
     94         };
     95         State m_state;
     96         bool m_escape;
     97         enum ContentModel {
     98             PCDATA,
     99             RCDATA,
    100             CDATA,
    101             PLAINTEXT
    102         };
    103         ContentModel m_contentModel;
    104         unsigned m_commentPos;
    105         State m_stateBeforeEntityInAttributeValue;
    106 
    107         static const unsigned lastCharactersBufferSize = 8;
    108         UChar m_lastCharacters[lastCharactersBufferSize];
    109         unsigned m_lastCharacterIndex;
    110 
    111         bool m_closeTag;
    112         Vector<UChar, 32> m_tagName;
    113         Vector<UChar, 32> m_attributeName;
    114         Vector<UChar> m_attributeValue;
    115         AtomicString m_lastStartTag;
    116 
    117         String m_urlToLoad;
    118         String m_charset;
    119         bool m_linkIsStyleSheet;
    120 
    121         enum CSSState {
    122             CSSInitial,
    123             CSSMaybeComment,
    124             CSSComment,
    125             CSSMaybeCommentEnd,
    126             CSSRuleStart,
    127             CSSRule,
    128             CSSAfterRule,
    129             CSSRuleValue,
    130             CSSAfterRuleValue
    131         };
    132         CSSState m_cssState;
    133         Vector<UChar, 16> m_cssRule;
    134         Vector<UChar> m_cssRuleValue;
    135 
    136         double m_timeUsed;
    137 
    138         bool m_bodySeen;
    139         Document* m_document;
    140     };
    141 
    142 }
    143 
    144 #endif
    145