third_party/WebKit/Source/core/html/parser/HTMLEntitySearch.h

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