runtime/MatchResult.h

   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
  29 typedef uint64_t EncodedMatchResult;
  30
  31 struct 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