1/*
2 * Copyright (C) 2013 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 GOOGLE 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 GOOGLE 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 HTMLIdentifier_h
27#define HTMLIdentifier_h
28
29#if ENABLE(THREADED_HTML_PARSER)
30
31#include <wtf/text/WTFString.h>
32
33namespace WebCore {
34
35class QualifiedName;
36
37enum CharacterWidth {
38    Likely8Bit,
39    Force8Bit,
40    Force16Bit
41};
42
43class HTMLIdentifier {
44public:
45    HTMLIdentifier() : m_index(0) { }
46
47    template<size_t inlineCapacity>
48    HTMLIdentifier(const Vector<UChar, inlineCapacity>& vector, CharacterWidth width)
49        : m_index(findIndex(vector.data(), vector.size()))
50    {
51        if (m_index != invalidIndex)
52            return;
53        if (width == Likely8Bit)
54            m_string = StringImpl::create8BitIfPossible(vector);
55        else if (width == Force8Bit)
56            m_string = String::make8BitFrom16BitSource(vector);
57        else
58            m_string = String(vector);
59    }
60
61    // asString should only be used on the main thread.
62    const String& asString() const;
63    // asStringImpl() is safe to call from any thread.
64    const StringImpl* asStringImpl() const;
65
66    static void init();
67
68    bool isSafeToSendToAnotherThread() const { return m_string.isSafeToSendToAnotherThread(); }
69
70#ifndef NDEBUG
71    static bool hasIndex(const StringImpl*);
72#endif
73
74private:
75    static const unsigned invalidIndex = -1;
76    static unsigned maxNameLength;
77    static unsigned findIndex(const UChar* characters, unsigned length);
78    static void addNames(QualifiedName** names, unsigned namesCount, unsigned indexOffset);
79
80    // FIXME: This could be a union.
81    unsigned m_index;
82    String m_string;
83};
84
85}
86
87#endif // ENABLE(THREADED_HTML_PARSER)
88
89#endif
90