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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_executor.h
* This is an internal header file, included by other library headers.
* Do not attempt to use it directly. @headername{regex}
*/
// FIXME convert comments to doxygen format.
namespace std _GLIBCXX_VISIBILITY(default)
{
namespace __detail
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
/**
* @addtogroup regex-detail
* @{
*/
/**
* @brief Takes a regex and an input string in and
* do the matching.
*
* The %_Executor class has two modes: DFS mode and BFS mode, controlled
* by the template parameter %__dfs_mode.
*/
template<typename _BiIter, typename _Alloc, typename _TraitsT,
bool __dfs_mode>
class _Executor
{
public:
typedef typename iterator_traits<_BiIter>::value_type _CharT;
typedef basic_regex<_CharT, _TraitsT> _RegexT;
typedef std::vector<sub_match<_BiIter>, _Alloc> _ResultsVec;
typedef regex_constants::match_flag_type _FlagT;
typedef typename _TraitsT::char_class_type _ClassT;
typedef _NFA<_TraitsT> _NFAT;
public:
_Executor(_BiIter __begin,
_BiIter __end,
_ResultsVec& __results,
const _RegexT& __re,
_FlagT __flags)
: _M_begin(__begin),
_M_end(__end),
_M_re(__re),
_M_nfa(*__re._M_automaton),
_M_results(__results),
_M_match_queue(__dfs_mode ? nullptr
: new vector<pair<_StateIdT, _ResultsVec>>()),
_M_visited(__dfs_mode ? nullptr : new vector<bool>(_M_nfa.size())),
_M_flags((__flags & regex_constants::match_prev_avail)
? (__flags
& ~regex_constants::match_not_bol
& ~regex_constants::match_not_bow)
: __flags),
_M_start_state(_M_nfa._M_start())
{ }
// Set matched when string exactly match the pattern.
bool
_M_match()
{
_M_current = _M_begin;
return _M_main<true>();
}
// Set matched when some prefix of the string matches the pattern.
bool
_M_search_from_first()
{
_M_current = _M_begin;
return _M_main<false>();
}
bool
_M_search();
private:
template<bool __match_mode>
void
_M_dfs(_StateIdT __start);
template<bool __match_mode>
bool
_M_main();
bool
_M_is_word(_CharT __ch) const
{
static const _CharT __s[2] = { 'w' };
return _M_re._M_traits.isctype
(__ch, _M_re._M_traits.lookup_classname(__s, __s+1));
}
bool
_M_at_begin() const
{
return _M_current == _M_begin
&& !(_M_flags & (regex_constants::match_not_bol
| regex_constants::match_prev_avail));
}
bool
_M_at_end() const
{
return _M_current == _M_end
&& !(_M_flags & regex_constants::match_not_eol);
}
bool
_M_word_boundary(_State<_TraitsT> __state) const;
bool
_M_lookahead(_State<_TraitsT> __state);
public:
_ResultsVec _M_cur_results;
_BiIter _M_current;
const _BiIter _M_begin;
const _BiIter _M_end;
const _RegexT& _M_re;
const _NFAT& _M_nfa;
_ResultsVec& _M_results;
// Used in BFS, saving states that need to be considered for the next
// character.
std::unique_ptr<vector<pair<_StateIdT, _ResultsVec>>> _M_match_queue;
// Used in BFS, indicating that which state is already visited.
std::unique_ptr<vector<bool>> _M_visited;
_FlagT _M_flags;
// To record current solution.
_StateIdT _M_start_state;
// Do we have a solution so far?
bool _M_has_sol;
};
//@} regex-detail
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace __detail
} // namespace std
#include <bits/regex_executor.tcc>
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