runtime/RegExpKey.h

   1 /*
   2  * Copyright (C) 2010 University of Szeged
   3  * Copyright (C) 2010 Renata Hodovan (hodovan@inf.u-szeged.hu)
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY UNIVERSITY OF SZEGED ``AS IS'' AND ANY
  16  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  18  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL UNIVERSITY OF SZEGED OR
  19  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  20  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  21  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  22  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  23  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  25  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 #include "UString.h"
  29
  30 #ifndef RegExpKey_h
  31 #define RegExpKey_h
  32
  33 namespace JSC {
  34
  35 struct RegExpKey {
  36     int flagsValue;
  37     RefPtr<UString::Rep> pattern;
  38
  39     RegExpKey()
  40         : flagsValue(0)
  41     {
  42     }
  43
  44     RegExpKey(int flags)
  45         : flagsValue(flags)
  46     {
  47     }
  48
  49     RegExpKey(int flags, const UString& pattern)
  50         : flagsValue(flags)
  51         , pattern(pattern.rep())
  52     {
  53     }
  54
  55     RegExpKey(int flags, const PassRefPtr<UString::Rep> pattern)
  56         : flagsValue(flags)
  57         , pattern(pattern)
  58     {
  59     }
  60
  61     RegExpKey(const UString& flags, const UString& pattern)
  62         : pattern(pattern.rep())
  63     {
  64         flagsValue = getFlagsValue(flags);
  65     }
  66
  67     int getFlagsValue(const UString flags)
  68     {
  69         flagsValue = 0;
  70         if (flags.find('g') != UString::NotFound)
  71             flagsValue += 4;
  72         if (flags.find('i') != UString::NotFound)
  73             flagsValue += 2;
  74         if (flags.find('m') != UString::NotFound)
  75             flagsValue += 1;
  76         return flagsValue;
  77     }
  78 };
  79 } // namespace JSC
  80
  81 namespace WTF {
  82 template<typename T> struct DefaultHash;
  83 template<typename T> struct RegExpHash;
  84
  85 inline bool operator==(const JSC::RegExpKey& a, const JSC::RegExpKey& b)
  86 {
  87     if (a.flagsValue != b.flagsValue)
  88         return false;
  89     if (!a.pattern)
  90         return !b.pattern;
  91     if (!b.pattern)
  92         return false;
  93     return equal(a.pattern.get(), b.pattern.get());
  94 }
  95
  96 template<> struct RegExpHash<JSC::RegExpKey> {
  97     static unsigned hash(const JSC::RegExpKey& key) { return key.pattern->hash(); }
  98     static bool equal(const JSC::RegExpKey& a, const JSC::RegExpKey& b) { return a == b; }
  99     static const bool safeToCompareToEmptyOrDeleted = false;
 100 };
 101
 102 template<> struct DefaultHash<JSC::RegExpKey> {
 103     typedef RegExpHash<JSC::RegExpKey> Hash;
 104 };
 105
 106 template<> struct HashTraits<JSC::RegExpKey> : GenericHashTraits<JSC::RegExpKey> {
 107     static void constructDeletedValue(JSC::RegExpKey& slot) { slot.flagsValue = -1; }
 108     static bool isDeletedValue(const JSC::RegExpKey& value) { return value.flagsValue == -1; }
 109 };
 110 } // namespace WTF
 111
 112 #endif // RegExpKey_h