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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 CSSPreloadScanner_h
     28 #define CSSPreloadScanner_h
     29 
     30 #include "core/html/parser/HTMLResourcePreloader.h"
     31 #include "core/html/parser/HTMLToken.h"
     32 #include "wtf/text/StringBuilder.h"
     33 
     34 namespace WebCore {
     35 
     36 class HTMLIdentifier;
     37 class SegmentedString;
     38 
     39 class CSSPreloadScanner {
     40     WTF_MAKE_NONCOPYABLE(CSSPreloadScanner);
     41 public:
     42     CSSPreloadScanner();
     43     ~CSSPreloadScanner();
     44 
     45     void reset();
     46 
     47     void scan(const HTMLToken::DataVector&, const SegmentedString&, PreloadRequestStream&);
     48     void scan(const HTMLIdentifier&, const SegmentedString&, PreloadRequestStream&);
     49 
     50 private:
     51     enum State {
     52         Initial,
     53         MaybeComment,
     54         Comment,
     55         MaybeCommentEnd,
     56         RuleStart,
     57         Rule,
     58         AfterRule,
     59         RuleValue,
     60         AfterRuleValue,
     61         DoneParsingImportRules,
     62     };
     63 
     64     template<typename Char>
     65     void scanCommon(const Char* begin, const Char* end, const SegmentedString&, PreloadRequestStream&);
     66 
     67     inline void tokenize(UChar, const SegmentedString&);
     68     void emitRule(const SegmentedString&);
     69 
     70     State m_state;
     71     StringBuilder m_rule;
     72     StringBuilder m_ruleValue;
     73 
     74     // Only non-zero during scan()
     75     PreloadRequestStream* m_requests;
     76 };
     77 
     78 }
     79 
     80 #endif
     81