1 /* 2 * Copyright (C) 2008 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 Escapes_h 27 #define Escapes_h 28 29 #include <wtf/Platform.h> 30 31 #if ENABLE(WREC) 32 33 #include <wtf/Assertions.h> 34 35 namespace JSC { namespace WREC { 36 37 class CharacterClass; 38 39 class Escape { 40 public: 41 enum Type { 42 PatternCharacter, 43 CharacterClass, 44 Backreference, 45 WordBoundaryAssertion, 46 Error, 47 }; 48 Escape(Type type)49 Escape(Type type) 50 : m_type(type) 51 { 52 } 53 type()54 Type type() const { return m_type; } 55 56 private: 57 Type m_type; 58 59 protected: 60 // Used by subclasses to store data. 61 union { 62 int i; 63 const WREC::CharacterClass* c; 64 } m_u; 65 bool m_invert; 66 }; 67 68 class PatternCharacterEscape : public Escape { 69 public: cast(const Escape & escape)70 static const PatternCharacterEscape& cast(const Escape& escape) 71 { 72 ASSERT(escape.type() == PatternCharacter); 73 return static_cast<const PatternCharacterEscape&>(escape); 74 } 75 PatternCharacterEscape(int character)76 PatternCharacterEscape(int character) 77 : Escape(PatternCharacter) 78 { 79 m_u.i = character; 80 } 81 Escape()82 operator Escape() const { return *this; } 83 character()84 int character() const { return m_u.i; } 85 }; 86 87 class CharacterClassEscape : public Escape { 88 public: cast(const Escape & escape)89 static const CharacterClassEscape& cast(const Escape& escape) 90 { 91 ASSERT(escape.type() == CharacterClass); 92 return static_cast<const CharacterClassEscape&>(escape); 93 } 94 CharacterClassEscape(const WREC::CharacterClass & characterClass,bool invert)95 CharacterClassEscape(const WREC::CharacterClass& characterClass, bool invert) 96 : Escape(CharacterClass) 97 { 98 m_u.c = &characterClass; 99 m_invert = invert; 100 } 101 Escape()102 operator Escape() { return *this; } 103 characterClass()104 const WREC::CharacterClass& characterClass() const { return *m_u.c; } invert()105 bool invert() const { return m_invert; } 106 }; 107 108 class BackreferenceEscape : public Escape { 109 public: cast(const Escape & escape)110 static const BackreferenceEscape& cast(const Escape& escape) 111 { 112 ASSERT(escape.type() == Backreference); 113 return static_cast<const BackreferenceEscape&>(escape); 114 } 115 BackreferenceEscape(int subpatternId)116 BackreferenceEscape(int subpatternId) 117 : Escape(Backreference) 118 { 119 m_u.i = subpatternId; 120 } 121 Escape()122 operator Escape() const { return *this; } 123 subpatternId()124 int subpatternId() const { return m_u.i; } 125 }; 126 127 class WordBoundaryAssertionEscape : public Escape { 128 public: cast(const Escape & escape)129 static const WordBoundaryAssertionEscape& cast(const Escape& escape) 130 { 131 ASSERT(escape.type() == WordBoundaryAssertion); 132 return static_cast<const WordBoundaryAssertionEscape&>(escape); 133 } 134 WordBoundaryAssertionEscape(bool invert)135 WordBoundaryAssertionEscape(bool invert) 136 : Escape(WordBoundaryAssertion) 137 { 138 m_invert = invert; 139 } 140 Escape()141 operator Escape() const { return *this; } 142 invert()143 bool invert() const { return m_invert; } 144 }; 145 146 } } // namespace JSC::WREC 147 148 #endif // ENABLE(WREC) 149 150 #endif // Escapes_h 151