syntax2.h

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//+---------------------------------------------------------------------------
//
//  Copyright ( C ) Microsoft, 1994 - 2002.
//
//  File:       syntax2.h
//
//  Contents:   syntax modules for regexpr
//
//  Classes:    perl_syntax, posix_syntax
//
//  Author:     Eric Niebler ( [e-mail] )
//
//  History:    3-29-00   ericne   Created
//
//----------------------------------------------------------------------------

#ifndef SYNTAX_H
#define SYNTAX_H

#ifdef _MSC_VER
#pragma warning( push )
// warning C4786: identifier was truncated to '255' characters in the debug information
#pragma warning( disable : 4786 )
#endif

#include <map>
#include <iosfwd>
#include <string>
#include <cctype>
#include <cwctype>
#include <cassert>
#include <iterator>
#include <stdexcept>

#ifndef ARRAYSIZE
# define ARRAYSIZE( a ) (sizeof(a)/sizeof((a)[0]))
#endif

#ifndef UCHAR_MAX
# define UCHAR_MAX 0xff
#endif

#ifndef WCHAR_MAX
# define WCHAR_MAX ((wchar_t)-1)
#endif

#ifdef _MSC_VER
# include <crtdbg.h>
# define REGEX_ASSERT(x)        _ASSERTE(x)
# define REGEX_FORCEINLINE      __forceinline
# define REGEX_SELECTANY        __declspec(selectany)
# define REGEX_CDECL            __cdecl
# define REGEX_SEH_TRY          __try
# define REGEX_SEH_EXCEPT(x)    __except( x )
# define REGEX_RESET_STK_OFLW() _resetstkoflw()
# if 1200 < _MSC_VER
# define REGEX_NOINLINE         __declspec(noinline)
# define REGEX_DEPRECATED       __declspec(deprecated)
# define REGEX_DEPENDENT_TYPENAME typename
# else
# define REGEX_NOINLINE
# define REGEX_DEPRECATED
# define REGEX_DEPENDENT_TYPENAME
# endif
#else
# include <cassert>
# define REGEX_ASSERT(x)        assert(x)
# define REGEX_NOINLINE
# define REGEX_FORCEINLINE      inline
# define REGEX_SELECTANY
# define REGEX_CDECL
# define REGEX_SEH_TRY
# define REGEX_SEH_EXCEPT(x)    if( false )
# define REGEX_RESET_STK_OFLW() ((void)0)
# define REGEX_DEPRECATED
# define REGEX_DEPENDENT_TYPENAME typename
#endif

#define REGEX_STRING(CharT,sz) (::regex::detail::literal<CharT>::string( sz, L##sz ))
#define REGEX_CHAR(CharT,ch) (static_cast<CharT>(::regex::detail::literal<CharT>::template character<ch,L##ch>::value))

#if defined(_MSC_VER) & _CPPLIB_VER <= 310
namespace std
{
template<>
struct iterator_traits< char * >
{    // get traits from iterator _Iter
    typedef random_access_iterator_tag iterator_category;
    typedef char value_type;
    typedef ptrdiff_t difference_type;
    typedef difference_type distance_type;    // retained
    typedef char * pointer;
    typedef char & reference;
};
template<>
struct iterator_traits< char const * >
{    // get traits from iterator _Iter
    typedef random_access_iterator_tag iterator_category;
    typedef char value_type;
    typedef ptrdiff_t difference_type;
    typedef difference_type distance_type;    // retained
    typedef char * pointer;
    typedef char & reference;
};

template<>
struct iterator_traits< wchar_t * >
{    // get traits from iterator _Iter
    typedef random_access_iterator_tag iterator_category;
    typedef wchar_t value_type;
    typedef ptrdiff_t difference_type;
    typedef difference_type distance_type;    // retained
    typedef wchar_t * pointer;
    typedef wchar_t & reference;
};
template<>
struct iterator_traits< wchar_t const * >
{    // get traits from iterator _Iter
    typedef random_access_iterator_tag iterator_category;
    typedef wchar_t value_type;
    typedef ptrdiff_t difference_type;
    typedef difference_type distance_type;    // retained
    typedef wchar_t * pointer;
    typedef wchar_t & reference;
};
}
#endif

namespace regex
{

class bad_regexpr : public std::invalid_argument
{
public:
    explicit bad_regexpr( std::string const & s )
        : std::invalid_argument( s ) {}
    virtual ~bad_regexpr() throw() {}
};

//
// Flags to control how matching occurs
//
enum REGEX_FLAGS
{
    NOFLAGS       = 0x0000,
    NOCASE        = 0x0001, // ignore case
    GLOBAL        = 0x0002, // match everywhere in the string
    MULTILINE     = 0x0004, // ^ and $ can match internal line breaks
    SINGLELINE    = 0x0008, // . can match newline character
    RIGHTMOST     = 0x0010, // start matching at the right of the string
    NOBACKREFS    = 0x0020, // only meaningful when used with GLOBAL and substitute
    FIRSTBACKREFS = 0x0040, // only meaningful when used with GLOBAL
    ALLBACKREFS   = 0x0080, // only meaningful when used with GLOBAL
    NORMALIZE     = 0x0100, // Preprocess patterns: "\\n" => "\n", etc.
    EXTENDED      = 0x0200, // ignore whitespace in pattern
};

// For backwards compatibility
REGEX_FLAGS const noflags = NOFLAGS;

// helper functions to make it easier to combine
// the regex flags.
inline REGEX_FLAGS operator|( REGEX_FLAGS f1, REGEX_FLAGS f2 )
{
    return ( REGEX_FLAGS ) ( ( unsigned )f1 | ( unsigned )f2 );
}
inline REGEX_FLAGS & operator|=( REGEX_FLAGS & f1, REGEX_FLAGS f2 )
{
    return f1 = ( f1 | f2 );
}
inline REGEX_FLAGS operator&( REGEX_FLAGS f1, REGEX_FLAGS f2 )
{
    return ( REGEX_FLAGS ) ( ( unsigned )f1 & ( unsigned )f2 );
}
inline REGEX_FLAGS & operator&=( REGEX_FLAGS & f1, REGEX_FLAGS f2 )
{
    return f1 = ( f1 & f2 );
}
#if !defined(_MSC_VER) | 1200 < _MSC_VER
inline REGEX_FLAGS operator~( REGEX_FLAGS f )
{
    return ( REGEX_FLAGS ) ~( unsigned )f;
}
#endif

//
// The following are the tokens that can be emitted by the syntax module.
// Don't reorder this list!!!
//
enum TOKEN
{
    NO_TOKEN = 0,

    // REGULAR TOKENS
    BEGIN_GROUP,
    END_GROUP,
    ALTERNATION,
    BEGIN_LINE,
    END_LINE,
    BEGIN_CHARSET,
    MATCH_ANY,
    ESCAPE,

    // QUANTIFICATION TOKENS
    ONE_OR_MORE,
    ZERO_OR_MORE,
    ZERO_OR_ONE,
    ONE_OR_MORE_MIN,
    ZERO_OR_MORE_MIN,
    ZERO_OR_ONE_MIN,
    BEGIN_RANGE,
    RANGE_SEPARATOR,
    END_RANGE,
    END_RANGE_MIN,

    // ESCAPE SEQUENCES
    ESC_DIGIT,
    ESC_NOT_DIGIT,
    ESC_SPACE,
    ESC_NOT_SPACE,
    ESC_WORD,
    ESC_NOT_WORD,
    ESC_BEGIN_STRING,
    ESC_END_STRING,
    ESC_END_STRING_z,
    ESC_WORD_BOUNDARY,
    ESC_NOT_WORD_BOUNDARY,
    ESC_WORD_START,
    ESC_WORD_STOP,
    ESC_QUOTE_META_ON,
    ESC_QUOTE_META_OFF,

    // SUBSTITUTION TOKENS
    SUBST_BACKREF,
    SUBST_PREMATCH,
    SUBST_POSTMATCH,
    SUBST_MATCH,
    SUBST_ESCAPE,
    SUBST_QUOTE_META_ON,
    SUBST_UPPER_ON,
    SUBST_UPPER_NEXT,
    SUBST_LOWER_ON,
    SUBST_LOWER_NEXT,
    SUBST_ALL_OFF,

    // CHARSET TOKENS
    CHARSET_NEGATE,
    CHARSET_ESCAPE,
    CHARSET_RANGE,
    CHARSET_BACKSPACE,
    CHARSET_END,
    CHARSET_ALNUM,
    CHARSET_NOT_ALNUM,
    CHARSET_ALPHA,
    CHARSET_NOT_ALPHA,
    CHARSET_BLANK,
    CHARSET_NOT_BLANK,
    CHARSET_CNTRL,
    CHARSET_NOT_CNTRL,
    CHARSET_DIGIT,
    CHARSET_NOT_DIGIT,
    CHARSET_GRAPH,
    CHARSET_NOT_GRAPH,
    CHARSET_LOWER,
    CHARSET_NOT_LOWER,
    CHARSET_PRINT,
    CHARSET_NOT_PRINT,
    CHARSET_PUNCT,
    CHARSET_NOT_PUNCT,
    CHARSET_SPACE,
    CHARSET_NOT_SPACE,
    CHARSET_UPPER,
    CHARSET_NOT_UPPER,
    CHARSET_XDIGIT,
    CHARSET_NOT_XDIGIT,

    // EXTENSION TOKENS
    EXT_NOBACKREF,
    EXT_POS_LOOKAHEAD,
    EXT_NEG_LOOKAHEAD,
    EXT_POS_LOOKBEHIND,
    EXT_NEG_LOOKBEHIND,
    EXT_INDEPENDENT,
    EXT_COMMENT,
    EXT_CONDITION,
    EXT_RECURSE,
    EXT_UNKNOWN
};

namespace detail
{

template< typename CharT > struct literal;

template<> struct literal<char>
{
    static char const * string( char const * sz, wchar_t const * ) { return sz; }
    template< char ch, wchar_t > struct character { enum { value = ch }; };
};

template<> struct literal<wchar_t>
{
    static wchar_t const * string( char const *, wchar_t const * sz ) { return sz; }
    template< char, wchar_t ch > struct character { enum { value = ch }; };
};

struct posix_charset_type
{
    char const * m_szcharset;
    size_t       cchars;
};

extern posix_charset_type const g_rgposix_charsets[];
extern size_t const g_cposix_charsets;

template< typename IterT >
bool is_posix_charset( IterT icur, IterT iend, char const * szcharset )
{
    for( ; iend != icur && char() != *szcharset; ++icur, ++szcharset )
    {
        if( *icur != *szcharset )
            return false;
    }
    return char() == *szcharset;
}

// Forward-declare the class that holds all the information
// about the set of characters that can be matched by a charset
struct charset;
void free_charset( charset const * );

template< typename CharT >
struct charset_map_node
{
    std::basic_string<CharT> m_str;
    charset const * m_rgcharsets[2]; // 0==case, 1==nocase

    charset_map_node()
    {
        m_rgcharsets[0] = m_rgcharsets[1] = 0;
    }

    charset_map_node( charset_map_node const & node )
    {
        *this = node;
    }

    charset_map_node & operator=( charset_map_node const & node )
    {
        m_str = node.m_str;
        m_rgcharsets[0] = node.m_rgcharsets[0];
        m_rgcharsets[1] = node.m_rgcharsets[1];
        return *this;
    }

    void set( std::basic_string<CharT> const & str )
    {
        clear();
        m_str = str;
    }

    void clear()
    {
        std::basic_string<CharT>().swap( m_str );
        free_charset( m_rgcharsets[0] );
        free_charset( m_rgcharsets[1] );
        m_rgcharsets[0] = m_rgcharsets[1] = 0;
    }
};

template< typename CharT >