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 #ifndef RegExpKey_h
  29 #define RegExpKey_h
  30
  31 #include <wtf/text/StringHash.h>
  32 #include <wtf/text/WTFString.h>
  33
  34 namespace JSC {
  35
  36 enum RegExpFlags {
  37     NoFlags = 0,
  38     FlagGlobal = 1,
  39     FlagIgnoreCase = 2,
  40     FlagMultiline = 4,
  41     InvalidFlags = 8,
  42     DeletedValueFlags = -1
  43 };
  44
  45 struct RegExpKey {
  46     RegExpFlags flagsValue;
  47     RefPtr<StringImpl> pattern;
  48
  49     RegExpKey()
  50         : flagsValue(NoFlags)
  51     {
  52     }
  53
  54     RegExpKey(RegExpFlags flags)
  55         : flagsValue(flags)
  56     {
  57     }
  58
  59     RegExpKey(RegExpFlags flags, const String& pattern)
  60         : flagsValue(flags)
  61         , pattern(pattern.impl())
  62     {
  63     }
  64
  65     RegExpKey(RegExpFlags flags, const PassRefPtr<StringImpl> pattern)
  66         : flagsValue(flags)
  67         , pattern(pattern)
  68     {
  69     }
  70
  71     RegExpKey(RegExpFlags flags, const RefPtr<StringImpl>& pattern)
  72         : flagsValue(flags)
  73         , pattern(pattern)
  74     {
  75     }
  76
  77     friend inline bool operator==(const RegExpKey& a, const RegExpKey& b);
  78
  79     struct Hash {
  80         static unsigned hash(const RegExpKey& key) { return key.pattern->hash(); }
  81         static bool equal(const RegExpKey& a, const RegExpKey& b) { return a == b; }
  82         static const bool safeToCompareToEmptyOrDeleted = false;
  83     };
  84 };
  85
  86 inline bool operator==(const RegExpKey& a, const RegExpKey& b)
  87 {
  88     if (a.flagsValue != b.flagsValue)
  89         return false;
  90     if (!a.pattern)
  91         return !b.pattern;
  92     if (!b.pattern)
  93         return false;
  94     return equal(a.pattern.get(), b.pattern.get());
  95 }
  96
  97 } // namespace JSC
  98
  99 namespace WTF {
 100 template<typename T> struct DefaultHash;
 101
 102 template<> struct DefaultHash<JSC::RegExpKey> {
 103     typedef JSC::RegExpKey::Hash Hash;
 104 };
 105
 106 template<> struct HashTraits<JSC::RegExpKey> : GenericHashTraits<JSC::RegExpKey> {
 107     static const bool emptyValueIsZero = true;
 108     static void constructDeletedValue(JSC::RegExpKey& slot) { slot.flagsValue = JSC::DeletedValueFlags; }
 109     static bool isDeletedValue(const JSC::RegExpKey& value) { return value.flagsValue == JSC::DeletedValueFlags; }
 110 };
 111 } // namespace WTF
 112
 113 #endif // RegExpKey_h