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std::__detail::_Scanner< _CharT >(3cxx) std::__detail::_Scanner< _CharT >(3cxx)

NAME

std::__detail::_Scanner< _CharT > - Scans an input range for regex tokens.

SYNOPSIS

Inherits std::__detail::_ScannerBase.

Public Types


typedef regex_constants::syntax_option_type _FlagT
typedef std::basic_string< _CharT > _StringT
enum _TokenT : unsigned { _S_token_anychar, _S_token_ord_char, _S_token_oct_num, _S_token_hex_num, _S_token_backref, _S_token_subexpr_begin, _S_token_subexpr_no_group_begin, _S_token_subexpr_lookahead_begin, _S_token_subexpr_end, _S_token_bracket_begin, _S_token_bracket_neg_begin, _S_token_bracket_end, _S_token_interval_begin, _S_token_interval_end, _S_token_quoted_class, _S_token_char_class_name, _S_token_collsymbol, _S_token_equiv_class_name, _S_token_opt, _S_token_or, _S_token_closure0, _S_token_closure1, _S_token_line_begin, _S_token_line_end, _S_token_word_bound, _S_token_comma, _S_token_dup_count, _S_token_eof, _S_token_bracket_dash, _S_token_unknown }
Token types returned from the scanner.

Public Member Functions


_Scanner (_IterT __begin, _IterT __end, _FlagT __flags, std::locale __loc)
void _M_advance ()
_TokenT _M_get_token () const
const _StringT & _M_get_value () const

Public Attributes


const typedef std::ctype< _CharT > _CtypeT
const typedef _CharT * _IterT

Protected Types


enum _StateT { _S_state_normal, _S_state_in_brace, _S_state_in_bracket }

Protected Member Functions


const char * _M_find_escape (char __c)
bool _M_is_awk () const
bool _M_is_basic () const
bool _M_is_ecma () const
bool _M_is_extended () const
bool _M_is_grep () const

Protected Attributes


bool _M_at_bracket_start
const std::pair< char, char > _M_awk_escape_tbl [11]
const char * _M_basic_spec_char
const std::pair< char, char > _M_ecma_escape_tbl [8]
const char * _M_ecma_spec_char
const std::pair< char, char > * _M_escape_tbl
const char * _M_extended_spec_char
_FlagT _M_flags
const char * _M_spec_char
_StateT _M_state
_TokenT _M_token
const std::pair< char, _TokenT > _M_token_tbl [9]

Detailed Description

template<typename _CharT>

class std::__detail::_Scanner< _CharT >" Scans an input range for regex tokens.

The _Scanner class interprets the regular expression pattern in the input range passed to its constructor as a sequence of parse tokens passed to the regular expression compiler. The sequence of tokens provided depends on the flag settings passed to the constructor: different regular expression grammars will interpret the same input pattern in syntactically different ways.

Definition at line 210 of file regex_scanner.h.

Author

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Sun Mar 22 2020 libstdc++