1/*
2 * Copyright (C) 2012 Apple 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 MatchResult_h
27#define MatchResult_h
28
29typedef uint64_t EncodedMatchResult;
30
31struct MatchResult {
32    ALWAYS_INLINE MatchResult(size_t start, size_t end)
33        : start(start)
34        , end(end)
35    {
36    }
37
38    explicit ALWAYS_INLINE MatchResult(EncodedMatchResult encoded)
39    {
40        union u {
41            uint64_t encoded;
42            struct s {
43                size_t start;
44                size_t end;
45            } split;
46        } value;
47        value.encoded = encoded;
48        start = value.split.start;
49        end = value.split.end;
50    }
51
52    ALWAYS_INLINE static MatchResult failed()
53    {
54        return MatchResult(WTF::notFound, 0);
55    }
56
57    ALWAYS_INLINE operator bool()
58    {
59        return start != WTF::notFound;
60    }
61
62    ALWAYS_INLINE bool empty()
63    {
64        return start == end;
65    }
66
67    size_t start;
68    size_t end;
69};
70
71#endif
72