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      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 
     49         Escape(Type type)
     50             : m_type(type)
     51         {
     52         }
     53 
     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:
     70         static const PatternCharacterEscape& cast(const Escape& escape)
     71         {
     72             ASSERT(escape.type() == PatternCharacter);
     73             return static_cast<const PatternCharacterEscape&>(escape);
     74         }
     75 
     76         PatternCharacterEscape(int character)
     77             : Escape(PatternCharacter)
     78         {
     79             m_u.i = character;
     80         }
     81 
     82         operator Escape() const { return *this; }
     83 
     84         int character() const { return m_u.i; }
     85     };
     86 
     87     class CharacterClassEscape : public Escape {
     88     public:
     89         static const CharacterClassEscape& cast(const Escape& escape)
     90         {
     91             ASSERT(escape.type() == CharacterClass);
     92             return static_cast<const CharacterClassEscape&>(escape);
     93         }
     94 
     95         CharacterClassEscape(const WREC::CharacterClass& characterClass, bool invert)
     96             : Escape(CharacterClass)
     97         {
     98             m_u.c = &characterClass;
     99             m_invert = invert;
    100         }
    101 
    102         operator Escape() { return *this; }
    103 
    104         const WREC::CharacterClass& characterClass() const { return *m_u.c; }
    105         bool invert() const { return m_invert; }
    106     };
    107 
    108     class BackreferenceEscape : public Escape {
    109     public:
    110         static const BackreferenceEscape& cast(const Escape& escape)
    111         {
    112             ASSERT(escape.type() == Backreference);
    113             return static_cast<const BackreferenceEscape&>(escape);
    114         }
    115 
    116         BackreferenceEscape(int subpatternId)
    117             : Escape(Backreference)
    118         {
    119             m_u.i = subpatternId;
    120         }
    121 
    122         operator Escape() const { return *this; }
    123 
    124         int subpatternId() const { return m_u.i; }
    125     };
    126 
    127     class WordBoundaryAssertionEscape : public Escape {
    128     public:
    129         static const WordBoundaryAssertionEscape& cast(const Escape& escape)
    130         {
    131             ASSERT(escape.type() == WordBoundaryAssertion);
    132             return static_cast<const WordBoundaryAssertionEscape&>(escape);
    133         }
    134 
    135         WordBoundaryAssertionEscape(bool invert)
    136             : Escape(WordBoundaryAssertion)
    137         {
    138             m_invert = invert;
    139         }
    140 
    141         operator Escape() const { return *this; }
    142 
    143         bool invert() const { return m_invert; }
    144     };
    145 
    146 } } // namespace JSC::WREC
    147 
    148 #endif // ENABLE(WREC)
    149 
    150 #endif // Escapes_h
    151