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
31namespace blink {
32
33struct HTMLEntityTableEntry;
34
35class HTMLEntitySearch {
36public:
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
46private:
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