Gecko [ c.stage.kornherr.net ]

Name	Size	Permission	Date
algorithmfwd.h	24.17 KB	-rw-r--r--	2025-12-18 20:59
align.h	3.62 KB	-rw-r--r--	2025-12-18 20:59
alloc_traits.h	29.53 KB	-rw-r--r--	2025-12-18 20:59
allocated_ptr.h	3.25 KB	-rw-r--r--	2025-12-18 20:59
allocator.h	8.66 KB	-rw-r--r--	2025-12-18 20:59
atomic_base.h	58.7 KB	-rw-r--r--	2025-12-18 20:59
atomic_futex.h	12.08 KB	-rw-r--r--	2025-12-18 20:59
atomic_lockfree_defines.h	2.3 KB	-rw-r--r--	2025-12-18 20:59
atomic_timed_wait.h	13.18 KB	-rw-r--r--	2025-12-18 20:59
atomic_wait.h	12.41 KB	-rw-r--r--	2025-12-18 20:59
basic_ios.h	15.75 KB	-rw-r--r--	2025-12-18 20:59
basic_ios.tcc	5.67 KB	-rw-r--r--	2025-12-18 20:59
basic_string.h	156.46 KB	-rw-r--r--	2025-12-18 20:59
basic_string.tcc	30.3 KB	-rw-r--r--	2025-12-18 20:59
boost_concept_check.h	29.13 KB	-rw-r--r--	2025-12-18 20:59
c++0x_warning.h	1.44 KB	-rw-r--r--	2025-12-18 20:59
char_traits.h	29.05 KB	-rw-r--r--	2025-12-18 20:59
charconv.h	3.58 KB	-rw-r--r--	2025-12-18 20:59
chrono.h	47.06 KB	-rw-r--r--	2025-12-18 20:59
chrono_io.h	76.97 KB	-rw-r--r--	2025-12-18 20:59
codecvt.h	24.9 KB	-rw-r--r--	2025-12-18 20:59
concept_check.h	3.32 KB	-rw-r--r--	2025-12-18 20:59
cow_string.h	130.97 KB	-rw-r--r--	2025-12-18 20:59
cpp_type_traits.h	14.51 KB	-rw-r--r--	2025-12-18 20:59
cxxabi_forced.h	1.77 KB	-rw-r--r--	2025-12-18 20:59
cxxabi_init_exception.h	2.17 KB	-rw-r--r--	2025-12-18 20:59
deque.tcc	41.38 KB	-rw-r--r--	2025-12-18 20:59
enable_special_members.h	12.16 KB	-rw-r--r--	2025-12-18 20:59
erase_if.h	2.09 KB	-rw-r--r--	2025-12-18 20:59
exception.h	2.41 KB	-rw-r--r--	2025-12-18 20:59
exception_defines.h	1.61 KB	-rw-r--r--	2025-12-18 20:59
exception_ptr.h	8.05 KB	-rw-r--r--	2025-12-18 20:59
forward_list.h	49.92 KB	-rw-r--r--	2025-12-18 20:59
forward_list.tcc	13.71 KB	-rw-r--r--	2025-12-18 20:59
fs_dir.h	17.26 KB	-rw-r--r--	2025-12-18 20:59
fs_fwd.h	10.66 KB	-rw-r--r--	2025-12-18 20:59
fs_ops.h	10.49 KB	-rw-r--r--	2025-12-18 20:59
fs_path.h	41.47 KB	-rw-r--r--	2025-12-18 20:59
fstream.tcc	32.64 KB	-rw-r--r--	2025-12-18 20:59
functexcept.h	4.02 KB	-rw-r--r--	2025-12-18 20:59
functional_hash.h	8.79 KB	-rw-r--r--	2025-12-18 20:59
gslice.h	5.39 KB	-rw-r--r--	2025-12-18 20:59
gslice_array.h	7.71 KB	-rw-r--r--	2025-12-18 20:59
hash_bytes.h	2.1 KB	-rw-r--r--	2025-12-18 20:59
hashtable.h	88.71 KB	-rw-r--r--	2025-12-18 20:59
hashtable_policy.h	63.92 KB	-rw-r--r--	2025-12-18 20:59
indirect_array.h	7.72 KB	-rw-r--r--	2025-12-18 20:59
invoke.h	6.08 KB	-rw-r--r--	2025-12-18 20:59
ios_base.h	31.51 KB	-rw-r--r--	2025-12-18 20:59
istream.tcc	31.79 KB	-rw-r--r--	2025-12-18 20:59
iterator_concepts.h	33.72 KB	-rw-r--r--	2025-12-18 20:59
list.tcc	17.63 KB	-rw-r--r--	2025-12-18 20:59
locale_classes.h	24.79 KB	-rw-r--r--	2025-12-18 20:59
locale_classes.tcc	10.61 KB	-rw-r--r--	2025-12-18 20:59
locale_conv.h	18.74 KB	-rw-r--r--	2025-12-18 20:59
locale_facets.h	91.72 KB	-rw-r--r--	2025-12-18 20:59
locale_facets.tcc	40.42 KB	-rw-r--r--	2025-12-18 20:59
locale_facets_nonio.h	69.1 KB	-rw-r--r--	2025-12-18 20:59
locale_facets_nonio.tcc	55.69 KB	-rw-r--r--	2025-12-18 20:59
localefwd.h	5.8 KB	-rw-r--r--	2025-12-18 20:59
mask_array.h	7.77 KB	-rw-r--r--	2025-12-18 20:59
max_size_type.h	22 KB	-rw-r--r--	2025-12-18 20:59
memory_resource.h	15.73 KB	-rw-r--r--	2025-12-18 20:59
memoryfwd.h	2.47 KB	-rw-r--r--	2025-12-18 20:59
mofunc_impl.h	7.45 KB	-rw-r--r--	2025-12-18 20:59
move.h	6.51 KB	-rw-r--r--	2025-12-18 20:59
move_only_function.h	6.12 KB	-rw-r--r--	2025-12-18 20:59
nested_exception.h	7.51 KB	-rw-r--r--	2025-12-18 20:59
new_allocator.h	7.27 KB	-rw-r--r--	2025-12-18 20:59
node_handle.h	11.08 KB	-rw-r--r--	2025-12-18 20:59
ostream.tcc	11.83 KB	-rw-r--r--	2025-12-18 20:59
ostream_insert.h	3.98 KB	-rw-r--r--	2025-12-18 20:59
parse_numbers.h	7.8 KB	-rw-r--r--	2025-12-18 20:59
postypes.h	7.33 KB	-rw-r--r--	2025-12-18 20:59
predefined_ops.h	9.94 KB	-rw-r--r--	2025-12-18 20:59
ptr_traits.h	8.29 KB	-rw-r--r--	2025-12-18 20:59
quoted_string.h	5.01 KB	-rw-r--r--	2025-12-18 20:59
random.h	178.84 KB	-rw-r--r--	2025-12-18 20:59
random.tcc	103.48 KB	-rw-r--r--	2025-12-18 20:59
range_access.h	11.67 KB	-rw-r--r--	2025-12-18 20:59
ranges_algo.h	128.65 KB	-rw-r--r--	2025-12-18 20:59
ranges_algobase.h	18.37 KB	-rw-r--r--	2025-12-18 20:59
ranges_base.h	28.82 KB	-rw-r--r--	2025-12-18 20:59
ranges_cmp.h	5.9 KB	-rw-r--r--	2025-12-18 20:59
ranges_uninitialized.h	17.71 KB	-rw-r--r--	2025-12-18 20:59
ranges_util.h	24.96 KB	-rw-r--r--	2025-12-18 20:59
refwrap.h	13.27 KB	-rw-r--r--	2025-12-18 20:59
regex.h	104.32 KB	-rw-r--r--	2025-12-18 20:59
regex.tcc	16.1 KB	-rw-r--r--	2025-12-18 20:59
regex_automaton.h	10.55 KB	-rw-r--r--	2025-12-18 20:59
regex_automaton.tcc	7.6 KB	-rw-r--r--	2025-12-18 20:59
regex_compiler.h	15.92 KB	-rw-r--r--	2025-12-18 20:59
regex_compiler.tcc	18.48 KB	-rw-r--r--	2025-12-18 20:59
regex_constants.h	14.54 KB	-rw-r--r--	2025-12-18 20:59
regex_error.h	5.35 KB	-rw-r--r--	2025-12-18 20:59
regex_executor.h	8.81 KB	-rw-r--r--	2025-12-18 20:59
regex_executor.tcc	18.49 KB	-rw-r--r--	2025-12-18 20:59
regex_scanner.h	6.88 KB	-rw-r--r--	2025-12-18 20:59
regex_scanner.tcc	14.59 KB	-rw-r--r--	2025-12-18 20:59
requires_hosted.h	1.36 KB	-rw-r--r--	2025-12-18 20:59
semaphore_base.h	7.7 KB	-rw-r--r--	2025-12-18 20:59
shared_ptr.h	38.14 KB	-rw-r--r--	2025-12-18 20:59
shared_ptr_atomic.h	22.79 KB	-rw-r--r--	2025-12-18 20:59
shared_ptr_base.h	65.18 KB	-rw-r--r--	2025-12-18 20:59
slice_array.h	9.39 KB	-rw-r--r--	2025-12-18 20:59
specfun.h	46.07 KB	-rw-r--r--	2025-12-18 20:59
sstream.tcc	9.91 KB	-rw-r--r--	2025-12-18 20:59
std_abs.h	4.63 KB	-rw-r--r--	2025-12-18 20:59
std_function.h	23.12 KB	-rw-r--r--	2025-12-18 20:59
std_mutex.h	6.69 KB	-rw-r--r--	2025-12-18 20:59
std_thread.h	9.84 KB	-rw-r--r--	2025-12-18 20:59
stl_algo.h	212.39 KB	-rw-r--r--	2025-12-18 20:59
stl_algobase.h	74.97 KB	-rw-r--r--	2025-12-18 20:59
stl_bvector.h	41.58 KB	-rw-r--r--	2025-12-18 20:59
stl_construct.h	8.47 KB	-rw-r--r--	2025-12-18 20:59
stl_deque.h	76.34 KB	-rw-r--r--	2025-12-18 20:59
stl_function.h	43.97 KB	-rw-r--r--	2025-12-18 20:59
stl_heap.h	20.31 KB	-rw-r--r--	2025-12-18 20:59
stl_iterator.h	92.81 KB	-rw-r--r--	2025-12-18 20:59
stl_iterator_base_funcs.h	8.75 KB	-rw-r--r--	2025-12-18 20:59
stl_iterator_base_types.h	9.48 KB	-rw-r--r--	2025-12-18 20:59
stl_list.h	70.62 KB	-rw-r--r--	2025-12-18 20:59
stl_map.h	54.86 KB	-rw-r--r--	2025-12-18 20:59
stl_multimap.h	42.71 KB	-rw-r--r--	2025-12-18 20:59
stl_multiset.h	36.87 KB	-rw-r--r--	2025-12-18 20:59
stl_numeric.h	14.25 KB	-rw-r--r--	2025-12-18 20:59
stl_pair.h	36.43 KB	-rw-r--r--	2025-12-18 20:59
stl_queue.h	28.06 KB	-rw-r--r--	2025-12-18 20:59
stl_raw_storage_iter.h	3.91 KB	-rw-r--r--	2025-12-18 20:59
stl_relops.h	4.47 KB	-rw-r--r--	2025-12-18 20:59
stl_set.h	37.13 KB	-rw-r--r--	2025-12-18 20:59
stl_stack.h	13.71 KB	-rw-r--r--	2025-12-18 20:59
stl_tempbuf.h	8.67 KB	-rw-r--r--	2025-12-18 20:59
stl_tree.h	72.06 KB	-rw-r--r--	2025-12-18 20:59
stl_uninitialized.h	35.63 KB	-rw-r--r--	2025-12-18 20:59
stl_vector.h	68.88 KB	-rw-r--r--	2025-12-18 20:59
stream_iterator.h	8.2 KB	-rw-r--r--	2025-12-18 20:59
streambuf.tcc	4.58 KB	-rw-r--r--	2025-12-18 20:59
streambuf_iterator.h	15.57 KB	-rw-r--r--	2025-12-18 20:59
string_view.tcc	7 KB	-rw-r--r--	2025-12-18 20:59
stringfwd.h	2.56 KB	-rw-r--r--	2025-12-18 20:59
this_thread_sleep.h	3.21 KB	-rw-r--r--	2025-12-18 20:59
uniform_int_dist.h	13 KB	-rw-r--r--	2025-12-18 20:59
unique_lock.h	6.16 KB	-rw-r--r--	2025-12-18 20:59
unique_ptr.h	35.62 KB	-rw-r--r--	2025-12-18 20:59
unordered_map.h	75.11 KB	-rw-r--r--	2025-12-18 20:59
unordered_set.h	61.7 KB	-rw-r--r--	2025-12-18 20:59
uses_allocator.h	6.91 KB	-rw-r--r--	2025-12-18 20:59
uses_allocator_args.h	8.53 KB	-rw-r--r--	2025-12-18 20:59
utility.h	8.12 KB	-rw-r--r--	2025-12-18 20:59
valarray_after.h	22.74 KB	-rw-r--r--	2025-12-18 20:59
valarray_array.h	20.8 KB	-rw-r--r--	2025-12-18 20:59
valarray_array.tcc	7.08 KB	-rw-r--r--	2025-12-18 20:59
valarray_before.h	18.69 KB	-rw-r--r--	2025-12-18 20:59
vector.tcc	31.5 KB	-rw-r--r--	2025-12-18 20:59

Rename

// class template regex -*- C++ -*-

// Copyright (C) 2013-2023 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.tcc
 *  This is an internal header file, included by other library headers.
 *  Do not attempt to use it directly. @headername{regex}
 */

// FIXME make comments doxygen format.

// N3376 specified 6 regex styles: ECMAScript, basic, extended, grep, egrep
// and awk
// 1) grep is basic except '\n' is treated as '|'
// 2) egrep is extended except '\n' is treated as '|'
// 3) awk is extended except special escaping rules, and there's no
//    back-reference.
//
// References:
//
// ECMAScript: ECMA-262 15.10
//
// basic, extended:
// http://pubs.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap09.html
//
// awk: http://pubs.opengroup.org/onlinepubs/000095399/utilities/awk.html

namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

namespace __detail
{
  template<typename _CharT>
    _Scanner<_CharT>::
    _Scanner(const _CharT* __begin, const _CharT* __end,
	     _FlagT __flags, std::locale __loc)
    : _ScannerBase(__flags),
      _M_current(__begin), _M_end(__end),
      _M_ctype(std::use_facet<_CtypeT>(__loc)),
      _M_eat_escape(_M_is_ecma()
		    ? &_Scanner::_M_eat_escape_ecma
		    : &_Scanner::_M_eat_escape_posix)
    { _M_advance(); }

template<typename _CharT>
    void
    _Scanner<_CharT>::
    _M_advance()
    {
      if (_M_current == _M_end)
	{
	  _M_token = _S_token_eof;
	  return;
	}

if (_M_state == _S_state_normal)
	_M_scan_normal();
      else if (_M_state == _S_state_in_bracket)
	_M_scan_in_bracket();
      else if (_M_state == _S_state_in_brace)
	_M_scan_in_brace();
      else
	{
	  __glibcxx_assert(!"unexpected state while processing regex");
	}
    }

// Differences between styles:
  // 1) "\(", "\)", "\{" in basic. It's not escaping.
  // 2) "(?:", "(?=", "(?!" in ECMAScript.
  template<typename _CharT>
    void
    _Scanner<_CharT>::
    _M_scan_normal()
    {
      auto __c = *_M_current++;

if (__builtin_strchr(_M_spec_char, _M_ctype.narrow(__c, ' ')) == nullptr)
	{
	  _M_token = _S_token_ord_char;
	  _M_value.assign(1, __c);
	  return;
	}
      if (__c == '\\')
	{
	  if (_M_current == _M_end)
	    __throw_regex_error(
	      regex_constants::error_escape,
	      "Invalid escape at end of regular expression");

if (!_M_is_basic()
	      || (*_M_current != '('
		  && *_M_current != ')'
		  && *_M_current != '{'))
	    {
	      (this->*_M_eat_escape)();
	      return;
	    }
	  __c = *_M_current++;
	}
      if (__c == '(')
	{
	  if (_M_is_ecma() && *_M_current == '?')
	    {
	      if (++_M_current == _M_end)
		__throw_regex_error(regex_constants::error_paren);

if (*_M_current == ':')
		{
		  ++_M_current;
		  _M_token = _S_token_subexpr_no_group_begin;
		}
	      else if (*_M_current == '=')
		{
		  ++_M_current;
		  _M_token = _S_token_subexpr_lookahead_begin;
		  _M_value.assign(1, 'p');
		}
	      else if (*_M_current == '!')
		{
		  ++_M_current;
		  _M_token = _S_token_subexpr_lookahead_begin;
		  _M_value.assign(1, 'n');
		}
	      else
		__throw_regex_error(regex_constants::error_paren,
				    "Invalid '(?...)' zero-width assertion "
				    "in regular expression");
	    }
	  else if (_M_flags & regex_constants::nosubs)
	    _M_token = _S_token_subexpr_no_group_begin;
	  else
	    _M_token = _S_token_subexpr_begin;
	}
      else if (__c == ')')
	_M_token = _S_token_subexpr_end;
      else if (__c == '[')
	{
	  _M_state = _S_state_in_bracket;
	  _M_at_bracket_start = true;
	  if (_M_current != _M_end && *_M_current == '^')
	    {
	      _M_token = _S_token_bracket_neg_begin;
	      ++_M_current;
	    }
	  else
	    _M_token = _S_token_bracket_begin;
	}
      else if (__c == '{')
	{
	  _M_state = _S_state_in_brace;
	  _M_token = _S_token_interval_begin;
	}
      else if (__builtin_expect(__c == _CharT(0), false))
	{
	  if (!_M_is_ecma())
	    __throw_regex_error(regex_constants::_S_null);
	  _M_token = _S_token_ord_char;
	  _M_value.assign(1, __c);
	}
      else if (__c != ']' && __c != '}')
	{
	  auto __it = _M_token_tbl;
	  auto __narrowc = _M_ctype.narrow(__c, '\0');
	  for (; __it->first != '\0'; ++__it)
	    if (__it->first == __narrowc)
	      {
		_M_token = __it->second;
		return;
	      }
	  __glibcxx_assert(!"unexpected special character in regex");
	}
      else
	{
	  _M_token = _S_token_ord_char;
	  _M_value.assign(1, __c);
	}
    }

// Differences between styles:
  // 1) different semantics of "[]" and "[^]".
  // 2) Escaping in bracket expr.
  template<typename _CharT>
    void
    _Scanner<_CharT>::
    _M_scan_in_bracket()
    {
      if (_M_current == _M_end)
	__throw_regex_error(regex_constants::error_brack);

auto __c = *_M_current++;

if (__c == '-')
	_M_token = _S_token_bracket_dash;
      else if (__c == '[')
	{
	  if (_M_current == _M_end)
	    __throw_regex_error(regex_constants::error_brack,
				"Incomplete '[[' character class in "
				"regular expression");

if (*_M_current == '.')
	    {
	      _M_token = _S_token_collsymbol;
	      _M_eat_class(*_M_current++);
	    }
	  else if (*_M_current == ':')
	    {
	      _M_token = _S_token_char_class_name;
	      _M_eat_class(*_M_current++);
	    }
	  else if (*_M_current == '=')
	    {
	      _M_token = _S_token_equiv_class_name;
	      _M_eat_class(*_M_current++);
	    }
	  else
	    {
	      _M_token = _S_token_ord_char;
	      _M_value.assign(1, __c);
	    }
	}
      // In POSIX, when encountering "[]" or "[^]", the ']' is interpreted
      // literally. So "[]]" and "[^]]" are valid regexes. See the testcases
      // `.../empty_range.cc`.
      else if (__c == ']' && (_M_is_ecma() || !_M_at_bracket_start))
	{
	  _M_token = _S_token_bracket_end;
	  _M_state = _S_state_normal;
	}
      // ECMAScript and awk permits escaping in bracket.
      else if (__c == '\\' && (_M_is_ecma() || _M_is_awk()))
	(this->*_M_eat_escape)();
      else
	{
	  _M_token = _S_token_ord_char;
	  _M_value.assign(1, __c);
	}
      _M_at_bracket_start = false;
    }

// Differences between styles:
  // 1) "\}" in basic style.
  template<typename _CharT>
    void
    _Scanner<_CharT>::
    _M_scan_in_brace()
    {
      if (_M_current == _M_end)
	__throw_regex_error(regex_constants::error_brace);

auto __c = *_M_current++;

if (_M_ctype.is(_CtypeT::digit, __c))
	{
	  _M_token = _S_token_dup_count;
	  _M_value.assign(1, __c);
	  while (_M_current != _M_end
		 && _M_ctype.is(_CtypeT::digit, *_M_current))
	    _M_value += *_M_current++;
	}
      else if (__c == ',')
	_M_token = _S_token_comma;
      // basic use \}.
      else if (_M_is_basic())
	{
	  if (__c == '\\' && _M_current != _M_end && *_M_current == '}')
	    {
	      _M_state = _S_state_normal;
	      _M_token = _S_token_interval_end;
	      ++_M_current;
	    }
	  else
	    __throw_regex_error(regex_constants::error_badbrace);
	}
      else if (__c == '}')
	{
	  _M_state = _S_state_normal;
	  _M_token = _S_token_interval_end;
	}
      else
	__throw_regex_error(regex_constants::error_badbrace);
    }

template<typename _CharT>
    void
    _Scanner<_CharT>::
    _M_eat_escape_ecma()
    {
      if (_M_current == _M_end)
	__throw_regex_error(regex_constants::error_escape);

auto __c = *_M_current++;
      auto __pos = _M_find_escape(_M_ctype.narrow(__c, '\0'));

if (__pos != nullptr && (__c != 'b' || _M_state == _S_state_in_bracket))
	{
	  _M_token = _S_token_ord_char;
	  _M_value.assign(1, *__pos);
	}
      else if (__c == 'b')
	{
	  _M_token = _S_token_word_bound;
	  _M_value.assign(1, 'p');
	}
      else if (__c == 'B')
	{
	  _M_token = _S_token_word_bound;
	  _M_value.assign(1, 'n');
	}
      // N3376 28.13
      else if (__c == 'd'
	       || __c == 'D'
	       || __c == 's'
	       || __c == 'S'
	       || __c == 'w'
	       || __c == 'W')
	{
	  _M_token = _S_token_quoted_class;
	  _M_value.assign(1, __c);
	}
      else if (__c == 'c')
	{
	  if (_M_current == _M_end)
	    __throw_regex_error(regex_constants::error_escape,
				"invalid '\\cX' control character in "
				"regular expression");
	  _M_token = _S_token_ord_char;
	  _M_value.assign(1, *_M_current++);
	}
      else if (__c == 'x' || __c == 'u')
	{
	  _M_value.clear();
	  const int __n = __c == 'x' ? 2 : 4;
	  for (int __i = 0; __i < __n; __i++)
	    {
	      if (_M_current == _M_end
		  || !_M_ctype.is(_CtypeT::xdigit, *_M_current))
		__throw_regex_error(regex_constants::error_escape,
				    __n == 2
				    ? "Invalid '\\xNN' control character in "
				      "regular expression"
				    : "Invalid '\\uNNNN' control character in "
				      "regular expression");
	      _M_value += *_M_current++;
	    }
	  _M_token = _S_token_hex_num;
	}
      // ECMAScript recognizes multi-digit back-references.
      else if (_M_ctype.is(_CtypeT::digit, __c))
	{
	  _M_value.assign(1, __c);
	  while (_M_current != _M_end
		 && _M_ctype.is(_CtypeT::digit, *_M_current))
	    _M_value += *_M_current++;
	  _M_token = _S_token_backref;
	}
      else
	{
	  _M_token = _S_token_ord_char;
	  _M_value.assign(1, __c);
	}
    }

// Differences between styles:
  // 1) Extended doesn't support backref, but basic does.
  template<typename _CharT>
    void
    _Scanner<_CharT>::
    _M_eat_escape_posix()
    {
      if (_M_current == _M_end)
	__throw_regex_error(regex_constants::error_escape);

auto __c = *_M_current;
      auto __pos = __builtin_strchr(_M_spec_char, _M_ctype.narrow(__c, '\0'));

if (__pos != nullptr && *__pos != '\0')
	{
	  _M_token = _S_token_ord_char;
	  _M_value.assign(1, __c);
	}
      // We MUST judge awk before handling backrefs. There's no backref in awk.
      else if (_M_is_awk())
	{
	  _M_eat_escape_awk();
	  return;
	}
      else if (_M_is_basic() && _M_ctype.is(_CtypeT::digit, __c) && __c != '0')
	{
	  _M_token = _S_token_backref;
	  _M_value.assign(1, __c);
	}
      else
	{
#ifdef __STRICT_ANSI__
	  // POSIX says it is undefined to escape ordinary characters
	  __throw_regex_error(regex_constants::error_escape);
#else
	  _M_token = _S_token_ord_char;
	  _M_value.assign(1, __c);
#endif
	}
      ++_M_current;
    }

template<typename _CharT>
    void
    _Scanner<_CharT>::
    _M_eat_escape_awk()
    {
      auto __c = *_M_current++;
      auto __pos = _M_find_escape(_M_ctype.narrow(__c, '\0'));

if (__pos != nullptr)
	{
	  _M_token = _S_token_ord_char;
	  _M_value.assign(1, *__pos);
	}
      // \ddd for oct representation
      else if (_M_ctype.is(_CtypeT::digit, __c)
	       && __c != '8'
	       && __c != '9')
	{
	  _M_value.assign(1,  __c);
	  for (int __i = 0;
	       __i < 2
	       && _M_current != _M_end
	       && _M_ctype.is(_CtypeT::digit, *_M_current)
	       && *_M_current != '8'
	       && *_M_current != '9';
	       __i++)
	    _M_value += *_M_current++;
	  _M_token = _S_token_oct_num;
	  return;
	}
      else
	__throw_regex_error(regex_constants::error_escape);
    }

// Eats a character class or throws an exception.
  // __ch could be ':', '.' or '=', _M_current is the char after ']' when
  // returning.
  template<typename _CharT>
    void
    _Scanner<_CharT>::
    _M_eat_class(char __ch)
    {
      for (_M_value.clear(); _M_current != _M_end && *_M_current != __ch;)
	_M_value += *_M_current++;
      if (_M_current == _M_end
	  || *_M_current++ != __ch
	  || _M_current == _M_end // skip __ch
	  || *_M_current++ != ']') // skip ']'
	{
	  __throw_regex_error(__ch == ':' ? regex_constants::error_ctype
					  : regex_constants::error_collate);
	}
    }

#ifdef _GLIBCXX_DEBUG
  template<typename _CharT>
    std::ostream&
    _Scanner<_CharT>::
    _M_print(std::ostream& __ostr)
    {
      switch (_M_token)
      {
      case _S_token_anychar:
	__ostr << "any-character\n";
	break;
      case _S_token_backref:
	__ostr << "backref\n";
	break;
      case _S_token_bracket_begin:
	__ostr << "bracket-begin\n";
	break;
      case _S_token_bracket_neg_begin:
	__ostr << "bracket-neg-begin\n";
	break;
      case _S_token_bracket_end:
	__ostr << "bracket-end\n";
	break;
      case _S_token_char_class_name:
	__ostr << "char-class-name \"" << _M_value << "\"\n";
	break;
      case _S_token_closure0:
	__ostr << "closure0\n";
	break;
      case _S_token_closure1:
	__ostr << "closure1\n";
	break;
      case _S_token_collsymbol:
	__ostr << "collsymbol \"" << _M_value << "\"\n";
	break;
      case _S_token_comma:
	__ostr << "comma\n";
	break;
      case _S_token_dup_count:
	__ostr << "dup count: " << _M_value << "\n";
	break;
      case _S_token_eof:
	__ostr << "EOF\n";
	break;
      case _S_token_equiv_class_name:
	__ostr << "equiv-class-name \"" << _M_value << "\"\n";
	break;
      case _S_token_interval_begin:
	__ostr << "interval begin\n";
	break;
      case _S_token_interval_end:
	__ostr << "interval end\n";
	break;
      case _S_token_line_begin:
	__ostr << "line begin\n";
	break;
      case _S_token_line_end:
	__ostr << "line end\n";
	break;
      case _S_token_opt:
	__ostr << "opt\n";
	break;
      case _S_token_or:
	__ostr << "or\n";
	break;
      case _S_token_ord_char:
	__ostr << "ordinary character: \"" << _M_value << "\"\n";
	break;
      case _S_token_subexpr_begin:
	__ostr << "subexpr begin\n";
	break;
      case _S_token_subexpr_no_group_begin:
	__ostr << "no grouping subexpr begin\n";
	break;
      case _S_token_subexpr_lookahead_begin:
	__ostr << "lookahead subexpr begin\n";
	break;
      case _S_token_subexpr_end:
	__ostr << "subexpr end\n";
	break;
      case _S_token_unknown:
	__ostr << "-- unknown token --\n";
	break;
      case _S_token_oct_num:
	__ostr << "oct number " << _M_value << "\n";
	break;
      case _S_token_hex_num:
	__ostr << "hex number " << _M_value << "\n";
	break;
      case _S_token_quoted_class:
	__ostr << "quoted class " << "\\" << _M_value << "\n";
	break;
      default:
	_GLIBCXX_DEBUG_ASSERT(false);
      }
      return __ostr;
    }
#endif

} // namespace __detail
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace