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      1 /*
      2  * Copyright (C) 2010 Google, 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 HTMLEntitySearch_h
     27 #define HTMLEntitySearch_h
     28 
     29 #include "wtf/text/WTFString.h"
     30 
     31 namespace WebCore {
     32 
     33 struct HTMLEntityTableEntry;
     34 
     35 class HTMLEntitySearch {
     36 public:
     37     HTMLEntitySearch();
     38 
     39     void advance(UChar);
     40 
     41     bool isEntityPrefix() const { return !!m_first; }
     42     int currentLength() const { return m_currentLength; }
     43 
     44     const HTMLEntityTableEntry* mostRecentMatch() const { return m_mostRecentMatch; }
     45 
     46 private:
     47     enum CompareResult {
     48         Before,
     49         Prefix,
     50         After,
     51     };
     52 
     53     CompareResult compare(const HTMLEntityTableEntry*, UChar) const;
     54     const HTMLEntityTableEntry* findFirst(UChar) const;
     55     const HTMLEntityTableEntry* findLast(UChar) const;
     56 
     57     void fail()
     58     {
     59         m_first = 0;
     60         m_last = 0;
     61     }
     62 
     63     int m_currentLength;
     64 
     65     const HTMLEntityTableEntry* m_mostRecentMatch;
     66     const HTMLEntityTableEntry* m_first;
     67     const HTMLEntityTableEntry* m_last;
     68 };
     69 
     70 }
     71 
     72 #endif
     73