d79d625275
* regex_executor.h(_M_handle_repeat, _M_handle_subexpr_begin) (_M_handle_subexpr_end, _M_handle_line_begin_assertion) (_M_handle_line_end_assertion, _M_handle_word_boundary) (_M_handle_subexpr_lookahead, _M_handle_match) (_M_handle_backref, _M_handle_accept, _M_handle_alternative): Add separate function declarations. * regex_executor.tcc: Split _M_dfs() into multiple handler functions. From-SVN: r239673
259 lines
7.3 KiB
C++
259 lines
7.3 KiB
C++
// class template regex -*- C++ -*-
|
|
|
|
// Copyright (C) 2013-2016 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 and does 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
|
|
{
|
|
using __search_mode = integral_constant<bool, __dfs_mode>;
|
|
using __dfs = true_type;
|
|
using __bfs = false_type;
|
|
|
|
enum class _Match_mode : unsigned char { _Exact, _Prefix };
|
|
|
|
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_rep_count(_M_nfa.size()),
|
|
_M_states(_M_nfa._M_start(), _M_nfa.size()),
|
|
_M_flags((__flags & regex_constants::match_prev_avail)
|
|
? (__flags
|
|
& ~regex_constants::match_not_bol
|
|
& ~regex_constants::match_not_bow)
|
|
: __flags)
|
|
{ }
|
|
|
|
// Set matched when string exactly matches the pattern.
|
|
bool
|
|
_M_match()
|
|
{
|
|
_M_current = _M_begin;
|
|
return _M_main(_Match_mode::_Exact);
|
|
}
|
|
|
|
// Set matched when some prefix of the string matches the pattern.
|
|
bool
|
|
_M_search_from_first()
|
|
{
|
|
_M_current = _M_begin;
|
|
return _M_main(_Match_mode::_Prefix);
|
|
}
|
|
|
|
bool
|
|
_M_search();
|
|
|
|
private:
|
|
void
|
|
_M_rep_once_more(_Match_mode __match_mode, _StateIdT);
|
|
|
|
void
|
|
_M_handle_repeat(_Match_mode, _StateIdT);
|
|
|
|
void
|
|
_M_handle_subexpr_begin(_Match_mode, _StateIdT);
|
|
|
|
void
|
|
_M_handle_subexpr_end(_Match_mode, _StateIdT);
|
|
|
|
void
|
|
_M_handle_line_begin_assertion(_Match_mode, _StateIdT);
|
|
|
|
void
|
|
_M_handle_line_end_assertion(_Match_mode, _StateIdT);
|
|
|
|
void
|
|
_M_handle_word_boundary(_Match_mode, _StateIdT);
|
|
|
|
void
|
|
_M_handle_subexpr_lookahead(_Match_mode, _StateIdT);
|
|
|
|
void
|
|
_M_handle_match(_Match_mode, _StateIdT);
|
|
|
|
void
|
|
_M_handle_backref(_Match_mode, _StateIdT);
|
|
|
|
void
|
|
_M_handle_accept(_Match_mode, _StateIdT);
|
|
|
|
void
|
|
_M_handle_alternative(_Match_mode, _StateIdT);
|
|
|
|
void
|
|
_M_dfs(_Match_mode __match_mode, _StateIdT __start);
|
|
|
|
bool
|
|
_M_main(_Match_mode __match_mode)
|
|
{ return _M_main_dispatch(__match_mode, __search_mode{}); }
|
|
|
|
bool
|
|
_M_main_dispatch(_Match_mode __match_mode, __dfs);
|
|
|
|
bool
|
|
_M_main_dispatch(_Match_mode __match_mode, __bfs);
|
|
|
|
bool
|
|
_M_is_word(_CharT __ch) const
|
|
{
|
|
static const _CharT __s[2] = { 'w' };
|
|
return _M_re._M_automaton->_M_traits.isctype
|
|
(__ch, _M_re._M_automaton->_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() const;
|
|
|
|
bool
|
|
_M_lookahead(_StateIdT __next);
|
|
|
|
// Holds additional information used in BFS-mode.
|
|
template<typename _SearchMode, typename _ResultsVec>
|
|
struct _State_info;
|
|
|
|
template<typename _ResultsVec>
|
|
struct _State_info<__bfs, _ResultsVec>
|
|
{
|
|
explicit
|
|
_State_info(_StateIdT __start, size_t __n)
|
|
: _M_visited_states(new bool[__n]()), _M_start(__start)
|
|
{ }
|
|
|
|
bool _M_visited(_StateIdT __i)
|
|
{
|
|
if (_M_visited_states[__i])
|
|
return true;
|
|
_M_visited_states[__i] = true;
|
|
return false;
|
|
}
|
|
|
|
void _M_queue(_StateIdT __i, const _ResultsVec& __res)
|
|
{ _M_match_queue.emplace_back(__i, __res); }
|
|
|
|
// Dummy implementations for BFS mode.
|
|
_BiIter* _M_get_sol_pos() { return nullptr; }
|
|
|
|
// Saves states that need to be considered for the next character.
|
|
vector<pair<_StateIdT, _ResultsVec>> _M_match_queue;
|
|
// Indicates which states are already visited.
|
|
unique_ptr<bool[]> _M_visited_states;
|
|
// To record current solution.
|
|
_StateIdT _M_start;
|
|
};
|
|
|
|
template<typename _ResultsVec>
|
|
struct _State_info<__dfs, _ResultsVec>
|
|
{
|
|
explicit
|
|
_State_info(_StateIdT __start, size_t) : _M_start(__start)
|
|
{ }
|
|
|
|
// Dummy implementations for DFS mode.
|
|
bool _M_visited(_StateIdT) const { return false; }
|
|
void _M_queue(_StateIdT, const _ResultsVec&) { }
|
|
|
|
_BiIter* _M_get_sol_pos() { return &_M_sol_pos; }
|
|
|
|
// To record current solution.
|
|
_StateIdT _M_start;
|
|
_BiIter _M_sol_pos;
|
|
};
|
|
|
|
public:
|
|
_ResultsVec _M_cur_results;
|
|
_BiIter _M_current;
|
|
_BiIter _M_begin;
|
|
const _BiIter _M_end;
|
|
const _RegexT& _M_re;
|
|
const _NFAT& _M_nfa;
|
|
_ResultsVec& _M_results;
|
|
vector<pair<_BiIter, int>> _M_rep_count;
|
|
_State_info<__search_mode, _ResultsVec> _M_states;
|
|
_FlagT _M_flags;
|
|
// 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>
|