regex_scanner.h
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// class template regex -*- C++ -*-
// Copyright (C) 2013-2014 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.
// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
// <http://www.gnu.org/licenses/>.
/**
* @file bits/regex_scanner.h
* This is an internal header file, included by other library headers.
* Do not attempt to use it directly. @headername{regex}
*/
namespace std _GLIBCXX_VISIBILITY(default)
{
namespace __detail
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
/**
* @addtogroup regex-detail
* @{
*/
/**
* @brief struct _Scanner. 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.
*/
template<typename _FwdIter>
class _Scanner
{
public:
typedef typename std::iterator_traits<_FwdIter>::value_type _CharT;
typedef std::basic_string<_CharT> _StringT;
typedef regex_constants::syntax_option_type _FlagT;
typedef const std::ctype<_CharT> _CtypeT;
/// Token types returned from the scanner.
enum _TokenT
{
_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, // neg if _M_value[0] == 'n'
_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_ungreedy,
_S_token_line_begin,
_S_token_line_end,
_S_token_word_bound, // neg if _M_value[0] == 'n'
_S_token_comma,
_S_token_dup_count,
_S_token_eof,
_S_token_unknown
};
_Scanner(_FwdIter __begin, _FwdIter __end,
_FlagT __flags, std::locale __loc);
void
_M_advance();
_TokenT
_M_get_token() const
{ return _M_token; }
const _StringT&
_M_get_value() const
{ return _M_value; }
#ifdef _GLIBCXX_DEBUG
std::ostream&
_M_print(std::ostream&);
#endif
private:
enum _StateT
{
_S_state_normal,
_S_state_in_brace,
_S_state_in_bracket,
};
void
_M_scan_normal();
void
_M_scan_in_bracket();
void
_M_scan_in_brace();
void
_M_eat_escape_ecma();
void
_M_eat_escape_posix();
void
_M_eat_escape_awk();
void
_M_eat_class(char);
constexpr bool
_M_is_ecma()
{ return _M_flags & regex_constants::ECMAScript; }
constexpr bool
_M_is_basic()
{ return _M_flags & (regex_constants::basic | regex_constants::grep); }
constexpr bool
_M_is_extended()
{
return _M_flags & (regex_constants::extended
| regex_constants::egrep
| regex_constants::awk);
}
constexpr bool
_M_is_grep()
{ return _M_flags & (regex_constants::grep | regex_constants::egrep); }
constexpr bool
_M_is_awk()
{ return _M_flags & regex_constants::awk; }
_StateT _M_state;
_FwdIter _M_current;
_FwdIter _M_end;
_FlagT _M_flags;
_CtypeT& _M_ctype;
_TokenT _M_token;
_StringT _M_value;
bool _M_at_bracket_start;
public:
// FIXME: make them static when this file is stable.
const std::map<char, _TokenT> _M_token_map;
const std::map<char, char> _M_ecma_escape_map;
const std::map<char, char> _M_awk_escape_map;
const std::set<char> _M_ecma_spec_char;
const std::set<char> _M_basic_spec_char;
const std::set<char> _M_extended_spec_char;
const std::map<char, char>& _M_escape_map;
const std::set<char>& _M_spec_char;
void (_Scanner::* _M_eat_escape)();
};
//@} regex-detail
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace __detail
} // namespace std
#include <bits/regex_scanner.tcc>
std::regex_constants::grep
Definition: regex_constants.h:152
std::regex_constants::extended
Definition: regex_constants.h:134
std::ctype
Primary class template ctype facet.This template class defines classification and conversion function...
Definition: locale_facets.h:605
std::__detail::_Scanner
struct _Scanner. Scans an input range for regex tokens.
Definition: regex_scanner.h:53
std::regex_constants::ECMAScript
Definition: regex_constants.h:117
std::regex_constants::egrep
Definition: regex_constants.h:160
std::regex_constants::awk
Definition: regex_constants.h:144
std::map< char, _TokenT >
std::locale
Container class for localization functionality.The locale class is first a class wrapper for C librar...
Definition: locale_classes.h:62
regex_scanner.tcc
std::regex_constants::syntax_option_type
syntax_option_type
This is a bitmask type indicating how to interpret the regex.
Definition: regex_constants.h:80
std::basic_string< _CharT >
std::regex_constants::basic
Definition: regex_constants.h:126
std::basic_ostream< char >
std::__detail::_Scanner::_TokenT
_TokenT
Token types returned from the scanner.
Definition: regex_scanner.h:62
std::set< char >