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      1 /*
      2  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
      3  * Copyright (C) 2010 Google Inc. All Rights Reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  *
     14  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
     15  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     17  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
     18  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     19  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     20  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     21  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     22  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     24  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     25  */
     26 
     27 #ifndef HTMLPreloadScanner_h
     28 #define HTMLPreloadScanner_h
     29 
     30 #include "core/html/parser/CSSPreloadScanner.h"
     31 #include "core/html/parser/CompactHTMLToken.h"
     32 #include "core/html/parser/HTMLToken.h"
     33 #include "platform/text/SegmentedString.h"
     34 #include "wtf/Vector.h"
     35 
     36 namespace blink {
     37 
     38 typedef size_t TokenPreloadScannerCheckpoint;
     39 
     40 class HTMLParserOptions;
     41 class HTMLTokenizer;
     42 class SegmentedString;
     43 class MediaValues;
     44 
     45 class TokenPreloadScanner {
     46     WTF_MAKE_NONCOPYABLE(TokenPreloadScanner); WTF_MAKE_FAST_ALLOCATED;
     47 public:
     48     TokenPreloadScanner(const KURL& documentURL, PassRefPtr<MediaValues>);
     49     ~TokenPreloadScanner();
     50 
     51     void scan(const HTMLToken&, const SegmentedString&, PreloadRequestStream& requests);
     52     void scan(const CompactHTMLToken&, const SegmentedString&, PreloadRequestStream& requests);
     53 
     54     void setPredictedBaseElementURL(const KURL& url) { m_predictedBaseElementURL = url; }
     55 
     56     // A TokenPreloadScannerCheckpoint is valid until the next call to rewindTo,
     57     // at which point all outstanding checkpoints are invalidated.
     58     TokenPreloadScannerCheckpoint createCheckpoint();
     59     void rewindTo(TokenPreloadScannerCheckpoint);
     60 
     61     bool isSafeToSendToAnotherThread()
     62     {
     63         return m_documentURL.isSafeToSendToAnotherThread()
     64             && m_predictedBaseElementURL.isSafeToSendToAnotherThread();
     65     }
     66 
     67 private:
     68     class StartTagScanner;
     69 
     70     template<typename Token>
     71     inline void scanCommon(const Token&, const SegmentedString&, PreloadRequestStream& requests);
     72 
     73     template<typename Token>
     74     void updatePredictedBaseURL(const Token&);
     75 
     76     struct Checkpoint {
     77         Checkpoint(const KURL& predictedBaseElementURL, bool inStyle, size_t templateCount)
     78             : predictedBaseElementURL(predictedBaseElementURL)
     79             , inStyle(inStyle)
     80             , templateCount(templateCount)
     81         {
     82         }
     83 
     84         KURL predictedBaseElementURL;
     85         bool inStyle;
     86         size_t templateCount;
     87     };
     88 
     89     CSSPreloadScanner m_cssScanner;
     90     const KURL m_documentURL;
     91     KURL m_predictedBaseElementURL;
     92     bool m_inStyle;
     93     bool m_inPicture;
     94     String m_pictureSourceURL;
     95     size_t m_templateCount;
     96     RefPtr<MediaValues> m_mediaValues;
     97 
     98     Vector<Checkpoint> m_checkpoints;
     99 };
    100 
    101 class HTMLPreloadScanner {
    102     WTF_MAKE_NONCOPYABLE(HTMLPreloadScanner); WTF_MAKE_FAST_ALLOCATED;
    103 public:
    104     HTMLPreloadScanner(const HTMLParserOptions&, const KURL& documentURL, PassRefPtr<MediaValues>);
    105     ~HTMLPreloadScanner();
    106 
    107     void appendToEnd(const SegmentedString&);
    108     void scan(HTMLResourcePreloader*, const KURL& documentBaseElementURL);
    109 
    110 private:
    111     TokenPreloadScanner m_scanner;
    112     SegmentedString m_source;
    113     HTMLToken m_token;
    114     OwnPtr<HTMLTokenizer> m_tokenizer;
    115 };
    116 
    117 }
    118 
    119 #endif
    120