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Edit File : regex_automaton.h \| Size : 10.47 KB
// class template regex -- C++ -- // Copyright (C) 2013-2018 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_automaton.h * This is an internal header file, included by other library headers. * Do not attempt to use it directly. @headername{regex} / // This macro defines the maximal state number a NFA can have. #ifndef _GLIBCXX_REGEX_STATE_LIMIT #define _GLIBCXX_REGEX_STATE_LIMIT 100000 #endif namespace std _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION namespace __detail { /* * @defgroup regex-detail Base and Implementation Classes * @ingroup regex * @{ / typedef long _StateIdT; static const _StateIdT _S_invalid_state_id = -1; template<typename _CharT> using _Matcher = std::function<bool (_CharT)>; /// Operation codes that define the type of transitions within the base NFA /// that represents the regular expression. enum _Opcode : int { _S_opcode_unknown, _S_opcode_alternative, _S_opcode_repeat, _S_opcode_backref, _S_opcode_line_begin_assertion, _S_opcode_line_end_assertion, _S_opcode_word_boundary, _S_opcode_subexpr_lookahead, _S_opcode_subexpr_begin, _S_opcode_subexpr_end, _S_opcode_dummy, _S_opcode_match, _S_opcode_accept, }; struct _State_base { protected: _Opcode _M_opcode; // type of outgoing transition public: _StateIdT _M_next; // outgoing transition union // Since they are mutually exclusive. { size_t _M_subexpr; // for _S_opcode_subexpr_ size_t _M_backref_index; // for _S_opcode_backref struct { // for _S_opcode_alternative, _S_opcode_repeat and // _S_opcode_subexpr_lookahead _StateIdT _M_alt; // for _S_opcode_word_boundary or _S_opcode_subexpr_lookahead or // quantifiers (ungreedy if set true) bool _M_neg; }; // For _S_opcode_match __gnu_cxx::__aligned_membuf<_Matcher<char>> _M_matcher_storage; }; protected: explicit _State_base(_Opcode __opcode) : _M_opcode(__opcode), _M_next(_S_invalid_state_id) { } public: bool _M_has_alt() { return _M_opcode == _S_opcode_alternative \|\| _M_opcode == _S_opcode_repeat \|\| _M_opcode == _S_opcode_subexpr_lookahead; } #ifdef _GLIBCXX_DEBUG std::ostream& _M_print(std::ostream& ostr) const; // Prints graphviz dot commands for state. std::ostream& _M_dot(std::ostream& __ostr, _StateIdT __id) const; #endif }; template<typename _Char_type> struct _State : _State_base { typedef _Matcher<_Char_type> _MatcherT; static_assert(sizeof(_MatcherT) == sizeof(_Matcher<char>), "std::function<bool(T)> has the same size as " "std::function<bool(char)>"); static_assert(alignof(_MatcherT) == alignof(_Matcher<char>), "std::function<bool(T)> has the same alignment as " "std::function<bool(char)>"); explicit _State(_Opcode __opcode) : _State_base(__opcode) { if (_M_opcode() == _S_opcode_match) new (this->_M_matcher_storage._M_addr()) _MatcherT(); } _State(const _State& __rhs) : _State_base(__rhs) { if (__rhs._M_opcode() == _S_opcode_match) new (this->_M_matcher_storage._M_addr()) _MatcherT(__rhs._M_get_matcher()); } _State(_State&& __rhs) : _State_base(__rhs) { if (__rhs._M_opcode() == _S_opcode_match) new (this->_M_matcher_storage._M_addr()) _MatcherT(std::move(__rhs._M_get_matcher())); } _State& operator=(const _State&) = delete; ~_State() { if (_M_opcode() == _S_opcode_match) _M_get_matcher().~_MatcherT(); } // Since correct ctor and dtor rely on _M_opcode, it's better not to // change it over time. _Opcode _M_opcode() const { return _State_base::_M_opcode; } bool _M_matches(_Char_type __char) const { return _M_get_matcher()(__char); } _MatcherT& _M_get_matcher() { return static_cast<_MatcherT>(this->_M_matcher_storage._M_addr()); } const _MatcherT& _M_get_matcher() const { return static_cast<const _MatcherT>( this->_M_matcher_storage._M_addr()); } }; struct _NFA_base { typedef size_t _SizeT; typedef regex_constants::syntax_option_type _FlagT; explicit _NFA_base(_FlagT __f) : _M_flags(__f), _M_start_state(0), _M_subexpr_count(0), _M_has_backref(false) { } _NFA_base(_NFA_base&&) = default; protected: ~_NFA_base() = default; public: _FlagT _M_options() const { return _M_flags; } _StateIdT _M_start() const { return _M_start_state; } _SizeT _M_sub_count() const { return _M_subexpr_count; } std::vector<size_t> _M_paren_stack; _FlagT _M_flags; _StateIdT _M_start_state; _SizeT _M_subexpr_count; bool _M_has_backref; }; template<typename _TraitsT> struct _NFA : _NFA_base, std::vector<_State<typename _TraitsT::char_type>> { typedef typename _TraitsT::char_type _Char_type; typedef _State<_Char_type> _StateT; typedef _Matcher<_Char_type> _MatcherT; _NFA(const typename _TraitsT::locale_type& __loc, _FlagT __flags) : _NFA_base(__flags) { _M_traits.imbue(__loc); } // for performance reasons _NFA objects should only be moved not copied _NFA(const _NFA&) = delete; _NFA(_NFA&&) = default; _StateIdT _M_insert_accept() { auto __ret = _M_insert_state(_StateT(_S_opcode_accept)); return __ret; } _StateIdT _M_insert_alt(_StateIdT __next, _StateIdT __alt, bool __neg __attribute__((__unused__))) { _StateT __tmp(_S_opcode_alternative); // It labels every quantifier to make greedy comparison easier in BFS // approach. __tmp._M_next = __next; __tmp._M_alt = __alt; return _M_insert_state(std::move(__tmp)); } _StateIdT _M_insert_repeat(_StateIdT __next, _StateIdT __alt, bool __neg) { _StateT __tmp(_S_opcode_repeat); // It labels every quantifier to make greedy comparison easier in BFS // approach. __tmp._M_next = __next; __tmp._M_alt = __alt; __tmp._M_neg = __neg; return _M_insert_state(std::move(__tmp)); } _StateIdT _M_insert_matcher(_MatcherT __m) { _StateT __tmp(_S_opcode_match); __tmp._M_get_matcher() = std::move(__m); return _M_insert_state(std::move(__tmp)); } _StateIdT _M_insert_subexpr_begin() { auto __id = this->_M_subexpr_count++; this->_M_paren_stack.push_back(__id); _StateT __tmp(_S_opcode_subexpr_begin); __tmp._M_subexpr = __id; return _M_insert_state(std::move(__tmp)); } _StateIdT _M_insert_subexpr_end() { _StateT __tmp(_S_opcode_subexpr_end); __tmp._M_subexpr = this->_M_paren_stack.back(); this->_M_paren_stack.pop_back(); return _M_insert_state(std::move(__tmp)); } _StateIdT _M_insert_backref(size_t __index); _StateIdT _M_insert_line_begin() { return _M_insert_state(_StateT(_S_opcode_line_begin_assertion)); } _StateIdT _M_insert_line_end() { return _M_insert_state(_StateT(_S_opcode_line_end_assertion)); } _StateIdT _M_insert_word_bound(bool __neg) { _StateT __tmp(_S_opcode_word_boundary); __tmp._M_neg = __neg; return _M_insert_state(std::move(__tmp)); } _StateIdT _M_insert_lookahead(_StateIdT __alt, bool __neg) { _StateT __tmp(_S_opcode_subexpr_lookahead); __tmp._M_alt = __alt; __tmp._M_neg = __neg; return _M_insert_state(std::move(__tmp)); } _StateIdT _M_insert_dummy() { return _M_insert_state(_StateT(_S_opcode_dummy)); } _StateIdT _M_insert_state(_StateT __s) { this->push_back(std::move(__s)); if (this->size() > _GLIBCXX_REGEX_STATE_LIMIT) __throw_regex_error( regex_constants::error_space, "Number of NFA states exceeds limit. Please use shorter regex " "string, or use smaller brace expression, or make " "_GLIBCXX_REGEX_STATE_LIMIT larger."); return this->size() - 1; } // Eliminate dummy node in this NFA to make it compact. void _M_eliminate_dummy(); #ifdef _GLIBCXX_DEBUG std::ostream& _M_dot(std::ostream& __ostr) const; #endif public: _TraitsT _M_traits; }; /// Describes a sequence of one or more %_State, its current start /// and end(s). This structure contains fragments of an NFA during /// construction. template<typename _TraitsT> class _StateSeq { public: typedef _NFA<_TraitsT> _RegexT; public: _StateSeq(_RegexT& __nfa, _StateIdT __s) : _M_nfa(__nfa), _M_start(__s), _M_end(__s) { } _StateSeq(_RegexT& __nfa, _StateIdT __s, _StateIdT __end) : _M_nfa(__nfa), _M_start(__s), _M_end(__end) { } // Append a state on this and change this to the new sequence. void _M_append(_StateIdT __id) { _M_nfa[_M_end]._M_next = __id; _M_end = __id; } // Append a sequence on this and change this to the new sequence. void _M_append(const _StateSeq& __s) { _M_nfa[_M_end]._M_next = __s._M_start; _M_end = __s._M_end; } // Clones an entire sequence. _StateSeq _M_clone(); public: _RegexT& _M_nfa; _StateIdT _M_start; _StateIdT _M_end; }; //@} regex-detail } // namespace __detail _GLIBCXX_END_NAMESPACE_VERSION } // namespace std #include <bits/regex_automaton.tcc> Back

Edit File : regex_automaton.h | Size : 10.47 KB

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

// Copyright (C) 2013-2018 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_automaton.h
 *  This is an internal header file, included by other library headers.
 *  Do not attempt to use it directly. @headername{regex}
 */

// This macro defines the maximal state number a NFA can have.
#ifndef _GLIBCXX_REGEX_STATE_LIMIT
#define _GLIBCXX_REGEX_STATE_LIMIT 100000
#endif

namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

namespace __detail
{
  /**
   *  @defgroup regex-detail Base and Implementation Classes
   *  @ingroup regex
   *  @{
   */

typedef long _StateIdT;
  static const _StateIdT _S_invalid_state_id  = -1;

template<typename _CharT>
    using _Matcher = std::function<bool (_CharT)>;

/// Operation codes that define the type of transitions within the base NFA
  /// that represents the regular expression.
  enum _Opcode : int
  {
      _S_opcode_unknown,
      _S_opcode_alternative,
      _S_opcode_repeat,
      _S_opcode_backref,
      _S_opcode_line_begin_assertion,
      _S_opcode_line_end_assertion,
      _S_opcode_word_boundary,
      _S_opcode_subexpr_lookahead,
      _S_opcode_subexpr_begin,
      _S_opcode_subexpr_end,
      _S_opcode_dummy,
      _S_opcode_match,
      _S_opcode_accept,
  };

struct _State_base
  {
  protected:
    _Opcode      _M_opcode;           // type of outgoing transition

public:
    _StateIdT    _M_next;             // outgoing transition
    union // Since they are mutually exclusive.
    {
      size_t _M_subexpr;        // for _S_opcode_subexpr_*
      size_t _M_backref_index;  // for _S_opcode_backref
      struct
      {
	// for _S_opcode_alternative, _S_opcode_repeat and
	// _S_opcode_subexpr_lookahead
	_StateIdT  _M_alt;
	// for _S_opcode_word_boundary or _S_opcode_subexpr_lookahead or
	// quantifiers (ungreedy if set true)
	bool       _M_neg;
      };
      // For _S_opcode_match
      __gnu_cxx::__aligned_membuf<_Matcher<char>> _M_matcher_storage;
    };

protected:
    explicit _State_base(_Opcode __opcode)
    : _M_opcode(__opcode), _M_next(_S_invalid_state_id)
    { }

public:
    bool
    _M_has_alt()
    {
      return _M_opcode == _S_opcode_alternative
	|| _M_opcode == _S_opcode_repeat
	|| _M_opcode == _S_opcode_subexpr_lookahead;
    }

#ifdef _GLIBCXX_DEBUG
    std::ostream&
    _M_print(std::ostream& ostr) const;

// Prints graphviz dot commands for state.
    std::ostream&
    _M_dot(std::ostream& __ostr, _StateIdT __id) const;
#endif
  };

template<typename _Char_type>
    struct _State : _State_base
    {
      typedef _Matcher<_Char_type> _MatcherT;
      static_assert(sizeof(_MatcherT) == sizeof(_Matcher<char>),
		    "std::function<bool(T)> has the same size as "
		    "std::function<bool(char)>");
      static_assert(alignof(_MatcherT) == alignof(_Matcher<char>),
		    "std::function<bool(T)> has the same alignment as "
		    "std::function<bool(char)>");

explicit
      _State(_Opcode __opcode) : _State_base(__opcode)
      {
	if (_M_opcode() == _S_opcode_match)
	  new (this->_M_matcher_storage._M_addr()) _MatcherT();
      }

_State(const _State& __rhs) : _State_base(__rhs)
      {
	if (__rhs._M_opcode() == _S_opcode_match)
	  new (this->_M_matcher_storage._M_addr())
	    _MatcherT(__rhs._M_get_matcher());
      }

_State(_State&& __rhs) : _State_base(__rhs)
      {
	if (__rhs._M_opcode() == _S_opcode_match)
	  new (this->_M_matcher_storage._M_addr())
	    _MatcherT(std::move(__rhs._M_get_matcher()));
      }

_State&
      operator=(const _State&) = delete;

~_State()
      {
	if (_M_opcode() == _S_opcode_match)
	  _M_get_matcher().~_MatcherT();
      }

// Since correct ctor and dtor rely on _M_opcode, it's better not to
      // change it over time.
      _Opcode
      _M_opcode() const
      { return _State_base::_M_opcode; }

bool
      _M_matches(_Char_type __char) const
      { return _M_get_matcher()(__char); }

_MatcherT&
      _M_get_matcher()
      { return *static_cast<_MatcherT*>(this->_M_matcher_storage._M_addr()); }

const _MatcherT&
      _M_get_matcher() const
      {
	return *static_cast<const _MatcherT*>(
	    this->_M_matcher_storage._M_addr());
      }
    };

struct _NFA_base
  {
    typedef size_t                              _SizeT;
    typedef regex_constants::syntax_option_type _FlagT;

explicit
    _NFA_base(_FlagT __f)
    : _M_flags(__f), _M_start_state(0), _M_subexpr_count(0),
    _M_has_backref(false)
    { }

_NFA_base(_NFA_base&&) = default;

protected:
    ~_NFA_base() = default;

public:
    _FlagT
    _M_options() const
    { return _M_flags; }

_StateIdT
    _M_start() const
    { return _M_start_state; }

_SizeT
    _M_sub_count() const
    { return _M_subexpr_count; }

std::vector<size_t>       _M_paren_stack;
    _FlagT                    _M_flags;
    _StateIdT                 _M_start_state;
    _SizeT                    _M_subexpr_count;
    bool                      _M_has_backref;
  };

template<typename _TraitsT>
    struct _NFA
    : _NFA_base, std::vector<_State<typename _TraitsT::char_type>>
    {
      typedef typename _TraitsT::char_type	_Char_type;
      typedef _State<_Char_type>		_StateT;
      typedef _Matcher<_Char_type>		_MatcherT;

_NFA(const typename _TraitsT::locale_type& __loc, _FlagT __flags)
      : _NFA_base(__flags)
      { _M_traits.imbue(__loc); }

// for performance reasons _NFA objects should only be moved not copied
      _NFA(const _NFA&) = delete;
      _NFA(_NFA&&) = default;

_StateIdT
      _M_insert_accept()
      {
	auto __ret = _M_insert_state(_StateT(_S_opcode_accept));
	return __ret;
      }

_StateIdT
      _M_insert_alt(_StateIdT __next, _StateIdT __alt,
		    bool __neg __attribute__((__unused__)))
      {
	_StateT __tmp(_S_opcode_alternative);
	// It labels every quantifier to make greedy comparison easier in BFS
	// approach.
	__tmp._M_next = __next;
	__tmp._M_alt = __alt;
	return _M_insert_state(std::move(__tmp));
      }

_StateIdT
      _M_insert_repeat(_StateIdT __next, _StateIdT __alt, bool __neg)
      {
	_StateT __tmp(_S_opcode_repeat);
	// It labels every quantifier to make greedy comparison easier in BFS
	// approach.
	__tmp._M_next = __next;
	__tmp._M_alt = __alt;
	__tmp._M_neg = __neg;
	return _M_insert_state(std::move(__tmp));
      }

_StateIdT
      _M_insert_matcher(_MatcherT __m)
      {
	_StateT __tmp(_S_opcode_match);
	__tmp._M_get_matcher() = std::move(__m);
	return _M_insert_state(std::move(__tmp));
      }

_StateIdT
      _M_insert_subexpr_begin()
      {
	auto __id = this->_M_subexpr_count++;
	this->_M_paren_stack.push_back(__id);
	_StateT __tmp(_S_opcode_subexpr_begin);
	__tmp._M_subexpr = __id;
	return _M_insert_state(std::move(__tmp));
      }

_StateIdT
      _M_insert_subexpr_end()
      {
	_StateT __tmp(_S_opcode_subexpr_end);
	__tmp._M_subexpr = this->_M_paren_stack.back();
	this->_M_paren_stack.pop_back();
	return _M_insert_state(std::move(__tmp));
      }

_StateIdT
      _M_insert_backref(size_t __index);

_StateIdT
      _M_insert_line_begin()
      { return _M_insert_state(_StateT(_S_opcode_line_begin_assertion)); }

_StateIdT
      _M_insert_line_end()
      { return _M_insert_state(_StateT(_S_opcode_line_end_assertion)); }

_StateIdT
      _M_insert_word_bound(bool __neg)
      {
	_StateT __tmp(_S_opcode_word_boundary);
	__tmp._M_neg = __neg;
	return _M_insert_state(std::move(__tmp));
      }

_StateIdT
      _M_insert_lookahead(_StateIdT __alt, bool __neg)
      {
	_StateT __tmp(_S_opcode_subexpr_lookahead);
	__tmp._M_alt = __alt;
	__tmp._M_neg = __neg;
	return _M_insert_state(std::move(__tmp));
      }

_StateIdT
      _M_insert_dummy()
      { return _M_insert_state(_StateT(_S_opcode_dummy)); }

_StateIdT
      _M_insert_state(_StateT __s)
      {
	this->push_back(std::move(__s));
	if (this->size() > _GLIBCXX_REGEX_STATE_LIMIT)
	  __throw_regex_error(
	    regex_constants::error_space,
	    "Number of NFA states exceeds limit. Please use shorter regex "
	    "string, or use smaller brace expression, or make "
	    "_GLIBCXX_REGEX_STATE_LIMIT larger.");
	return this->size() - 1;
      }

// Eliminate dummy node in this NFA to make it compact.
      void
      _M_eliminate_dummy();

#ifdef _GLIBCXX_DEBUG
      std::ostream&
      _M_dot(std::ostream& __ostr) const;
#endif
    public:
      _TraitsT                  _M_traits;
    };

/// Describes a sequence of one or more %_State, its current start
  /// and end(s).  This structure contains fragments of an NFA during
  /// construction.
  template<typename _TraitsT>
    class _StateSeq
    {
    public:
      typedef _NFA<_TraitsT> _RegexT;

public:
      _StateSeq(_RegexT& __nfa, _StateIdT __s)
      : _M_nfa(__nfa), _M_start(__s), _M_end(__s)
      { }

_StateSeq(_RegexT& __nfa, _StateIdT __s, _StateIdT __end)
      : _M_nfa(__nfa), _M_start(__s), _M_end(__end)
      { }

// Append a state on *this and change *this to the new sequence.
      void
      _M_append(_StateIdT __id)
      {
	_M_nfa[_M_end]._M_next = __id;
	_M_end = __id;
      }

// Append a sequence on *this and change *this to the new sequence.
      void
      _M_append(const _StateSeq& __s)
      {
	_M_nfa[_M_end]._M_next = __s._M_start;
	_M_end = __s._M_end;
      }

// Clones an entire sequence.
      _StateSeq
      _M_clone();

public:
      _RegexT&  _M_nfa;
      _StateIdT _M_start;
      _StateIdT _M_end;
    };

//@} regex-detail
} // namespace __detail

_GLIBCXX_END_NAMESPACE_VERSION
} // namespace std

#include <bits/regex_automaton.tcc>

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