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/*
* Copyright (C) 2008 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef Escapes_h
#define Escapes_h
#include <wtf/Platform.h>
#if ENABLE(WREC)
#include <wtf/Assertions.h>
namespace JSC { namespace WREC {
class CharacterClass;
class Escape {
public:
enum Type {
PatternCharacter,
CharacterClass,
Backreference,
WordBoundaryAssertion,
Error,
};
Escape(Type type)
: m_type(type)
{
}
Type type() const { return m_type; }
private:
Type m_type;
protected:
// Used by subclasses to store data.
union {
int i;
const WREC::CharacterClass* c;
} m_u;
bool m_invert;
};
class PatternCharacterEscape : public Escape {
public:
static const PatternCharacterEscape& cast(const Escape& escape)
{
ASSERT(escape.type() == PatternCharacter);
return static_cast<const PatternCharacterEscape&>(escape);
}
PatternCharacterEscape(int character)
: Escape(PatternCharacter)
{
m_u.i = character;
}
operator Escape() const { return *this; }
int character() const { return m_u.i; }
};
class CharacterClassEscape : public Escape {
public:
static const CharacterClassEscape& cast(const Escape& escape)
{
ASSERT(escape.type() == CharacterClass);
return static_cast<const CharacterClassEscape&>(escape);
}
CharacterClassEscape(const WREC::CharacterClass& characterClass, bool invert)
: Escape(CharacterClass)
{
m_u.c = &characterClass;
m_invert = invert;
}
operator Escape() { return *this; }
const WREC::CharacterClass& characterClass() const { return *m_u.c; }
bool invert() const { return m_invert; }
};
class BackreferenceEscape : public Escape {
public:
static const BackreferenceEscape& cast(const Escape& escape)
{
ASSERT(escape.type() == Backreference);
return static_cast<const BackreferenceEscape&>(escape);
}
BackreferenceEscape(int subpatternId)
: Escape(Backreference)
{
m_u.i = subpatternId;
}
operator Escape() const { return *this; }
int subpatternId() const { return m_u.i; }
};
class WordBoundaryAssertionEscape : public Escape {
public:
static const WordBoundaryAssertionEscape& cast(const Escape& escape)
{
ASSERT(escape.type() == WordBoundaryAssertion);
return static_cast<const WordBoundaryAssertionEscape&>(escape);
}
WordBoundaryAssertionEscape(bool invert)
: Escape(WordBoundaryAssertion)
{
m_invert = invert;
}
operator Escape() const { return *this; }
bool invert() const { return m_invert; }
};
} } // namespace JSC::WREC
#endif // ENABLE(WREC)
#endif // Escapes_h
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