// class template regex -*- C++ -*-
-// Copyright (C) 2013 Free Software Foundation, Inc.
+// Copyright (C) 2013-2024 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
namespace std _GLIBCXX_VISIBILITY(default)
{
-namespace __detail
-{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
+namespace __detail
+{
#ifdef _GLIBCXX_DEBUG
- template<typename _CharT, typename _TraitsT>
- std::ostream& _State<_CharT, _TraitsT>::
- _M_print(std::ostream& ostr) const
+ inline std::ostream&
+ _State_base::_M_print(std::ostream& __ostr) const
+ {
+ switch (_M_opcode)
{
- switch (_M_opcode)
- {
- case _S_opcode_alternative:
- ostr << "alt next=" << _M_next << " alt=" << _M_alt;
- break;
- case _S_opcode_subexpr_begin:
- ostr << "subexpr begin next=" << _M_next << " index=" << _M_subexpr;
- break;
- case _S_opcode_subexpr_end:
- ostr << "subexpr end next=" << _M_next << " index=" << _M_subexpr;
- break;
- case _S_opcode_backref:
- ostr << "backref next=" << _M_next << " index=" << _M_backref_index;
- break;
- case _S_opcode_match:
- ostr << "match next=" << _M_next;
- break;
- case _S_opcode_accept:
- ostr << "accept next=" << _M_next;
- break;
- default:
- ostr << "unknown next=" << _M_next;
- break;
- }
- return ostr;
+ case _S_opcode_alternative:
+ case _S_opcode_repeat:
+ __ostr << "alt next=" << _M_next << " alt=" << _M_alt;
+ break;
+ case _S_opcode_subexpr_begin:
+ __ostr << "subexpr begin next=" << _M_next << " index=" << _M_subexpr;
+ break;
+ case _S_opcode_subexpr_end:
+ __ostr << "subexpr end next=" << _M_next << " index=" << _M_subexpr;
+ break;
+ case _S_opcode_backref:
+ __ostr << "backref next=" << _M_next << " index=" << _M_backref_index;
+ break;
+ case _S_opcode_match:
+ __ostr << "match next=" << _M_next;
+ break;
+ case _S_opcode_accept:
+ __ostr << "accept next=" << _M_next;
+ break;
+ default:
+ __ostr << "unknown next=" << _M_next;
+ break;
}
+ return __ostr;
+ }
// Prints graphviz dot commands for state.
- template<typename _CharT, typename _TraitsT>
- std::ostream& _State<_CharT, _TraitsT>::
- _M_dot(std::ostream& __ostr, _StateIdT __id) const
+ inline std::ostream&
+ _State_base::_M_dot(std::ostream& __ostr, _StateIdT __id) const
+ {
+ switch (_M_opcode)
{
- switch (_M_opcode)
- {
- case _S_opcode_alternative:
- __ostr << __id << " [label=\"" << __id << "\\nALT\"];\n"
- << __id << " -> " << _M_next
- << " [label=\"epsilon\", tailport=\"s\"];\n"
- << __id << " -> " << _M_alt
- << " [label=\"epsilon\", tailport=\"n\"];\n";
- break;
- case _S_opcode_subexpr_begin:
- __ostr << __id << " [label=\"" << __id << "\\nSBEGIN "
- << _M_subexpr << "\"];\n"
- << __id << " -> " << _M_next << " [label=\"epsilon\"];\n";
- break;
- case _S_opcode_subexpr_end:
- __ostr << __id << " [label=\"" << __id << "\\nSEND "
- << _M_subexpr << "\"];\n"
- << __id << " -> " << _M_next << " [label=\"epsilon\"];\n";
- break;
- case _S_opcode_backref:
- __ostr << __id << " [label=\"" << __id << "\\nBACKREF "
- << _M_subexpr << "\"];\n"
- << __id << " -> " << _M_next << " [label=\"<match>\"];\n";
- break;
- case _S_opcode_match:
- __ostr << __id << " [label=\"" << __id << "\\nMATCH\"];\n"
- << __id << " -> " << _M_next << " [label=\"<match>\"];\n";
- break;
- case _S_opcode_accept:
- __ostr << __id << " [label=\"" << __id << "\\nACC\"];\n" ;
- break;
- default:
- __ostr << __id << " [label=\"" << __id << "\\nUNK\"];\n"
- << __id << " -> " << _M_next << " [label=\"?\"];\n";
- break;
- }
- return __ostr;
+ case _S_opcode_alternative:
+ case _S_opcode_repeat:
+ __ostr << __id << " [label=\"" << __id << "\\nALT\"];\n"
+ << __id << " -> " << _M_next
+ << " [label=\"next\", tailport=\"s\"];\n"
+ << __id << " -> " << _M_alt
+ << " [label=\"alt\", tailport=\"n\"];\n";
+ break;
+ case _S_opcode_backref:
+ __ostr << __id << " [label=\"" << __id << "\\nBACKREF "
+ << _M_subexpr << "\"];\n"
+ << __id << " -> " << _M_next << " [label=\"<match>\"];\n";
+ break;
+ case _S_opcode_line_begin_assertion:
+ __ostr << __id << " [label=\"" << __id << "\\nLINE_BEGIN \"];\n"
+ << __id << " -> " << _M_next << " [label=\"epsilon\"];\n";
+ break;
+ case _S_opcode_line_end_assertion:
+ __ostr << __id << " [label=\"" << __id << "\\nLINE_END \"];\n"
+ << __id << " -> " << _M_next << " [label=\"epsilon\"];\n";
+ break;
+ case _S_opcode_word_boundary:
+ __ostr << __id << " [label=\"" << __id << "\\nWORD_BOUNDRY "
+ << _M_neg << "\"];\n"
+ << __id << " -> " << _M_next << " [label=\"epsilon\"];\n";
+ break;
+ case _S_opcode_subexpr_lookahead:
+ __ostr << __id << " [label=\"" << __id << "\\nLOOK_AHEAD\"];\n"
+ << __id << " -> " << _M_next
+ << " [label=\"epsilon\", tailport=\"s\"];\n"
+ << __id << " -> " << _M_alt
+ << " [label=\"<assert>\", tailport=\"n\"];\n";
+ break;
+ case _S_opcode_subexpr_begin:
+ __ostr << __id << " [label=\"" << __id << "\\nSBEGIN "
+ << _M_subexpr << "\"];\n"
+ << __id << " -> " << _M_next << " [label=\"epsilon\"];\n";
+ break;
+ case _S_opcode_subexpr_end:
+ __ostr << __id << " [label=\"" << __id << "\\nSEND "
+ << _M_subexpr << "\"];\n"
+ << __id << " -> " << _M_next << " [label=\"epsilon\"];\n";
+ break;
+ case _S_opcode_dummy:
+ break;
+ case _S_opcode_match:
+ __ostr << __id << " [label=\"" << __id << "\\nMATCH\"];\n"
+ << __id << " -> " << _M_next << " [label=\"<match>\"];\n";
+ break;
+ case _S_opcode_accept:
+ __ostr << __id << " [label=\"" << __id << "\\nACC\"];\n" ;
+ break;
+ default:
+ _GLIBCXX_DEBUG_ASSERT(false);
+ break;
}
+ return __ostr;
+ }
- template<typename _CharT, typename _TraitsT>
- std::ostream& _NFA<_CharT, _TraitsT>::
- _M_dot(std::ostream& __ostr) const
+ template<typename _TraitsT>
+ std::ostream&
+ _NFA<_TraitsT>::_M_dot(std::ostream& __ostr) const
{
__ostr << "digraph _Nfa {\n"
- << " rankdir=LR;\n";
- for (unsigned int __i = 0; __i < this->size(); ++__i)
- { this->at(__i)._M_dot(__ostr, __i); }
+ " rankdir=LR;\n";
+ for (size_t __i = 0; __i < this->size(); ++__i)
+ (*this)[__i]._M_dot(__ostr, __i);
__ostr << "}\n";
return __ostr;
}
#endif
- template<typename _CharT, typename _TraitsT>
- _StateIdT _NFA<_CharT, _TraitsT>::
- _M_insert_backref(unsigned int __index)
+ template<typename _TraitsT>
+ _StateIdT
+ _NFA<_TraitsT>::_M_insert_backref(size_t __index)
{
+ if (this->_M_flags & regex_constants::__polynomial)
+ __throw_regex_error(regex_constants::error_complexity,
+ "Unexpected back-reference in polynomial mode.");
// To figure out whether a backref is valid, a stack is used to store
// unfinished sub-expressions. For example, when parsing
// "(a(b)(c\\1(d)))" at '\\1', _M_subexpr_count is 3, indicating that 3
// _M_paren_stack is {1, 3}, for incomplete "(a.." and "(c..". At this
// time, "\\2" is valid, but "\\1" and "\\3" are not.
if (__index >= _M_subexpr_count)
- __throw_regex_error(regex_constants::error_backref);
- for (auto __it : _M_paren_stack)
- if (__index == __it)
- __throw_regex_error(regex_constants::error_backref);
- _M_has_backref = true;
- this->push_back(_StateT(_S_opcode_backref, __index));
- return this->size()-1;
- }
-
- template<typename _CharT, typename _TraitsT>
- _StateSeq<_CharT, _TraitsT>& _StateSeq<_CharT, _TraitsT>::
- operator=(const _StateSeq& __rhs)
- {
- _M_start = __rhs._M_start;
- _M_end1 = __rhs._M_end1;
- _M_end2 = __rhs._M_end2;
- return *this;
- }
-
- template<typename _CharT, typename _TraitsT>
- void _StateSeq<_CharT, _TraitsT>::
- _M_push_back(_StateIdT __id)
- {
- if (_M_end1 != _S_invalid_state_id)
- _M_nfa[_M_end1]._M_next = __id;
- _M_end1 = __id;
+ __throw_regex_error(
+ regex_constants::error_backref,
+ "Back-reference index exceeds current sub-expression count.");
+ for (auto __it : this->_M_paren_stack)
+ if (__index == __it)
+ __throw_regex_error(
+ regex_constants::error_backref,
+ "Back-reference referred to an opened sub-expression.");
+ this->_M_has_backref = true;
+ _StateT __tmp(_S_opcode_backref);
+ __tmp._M_backref_index = __index;
+ return _M_insert_state(std::move(__tmp));
}
- template<typename _CharT, typename _TraitsT>
- void _StateSeq<_CharT, _TraitsT>::
- _M_append(_StateIdT __id)
+ template<typename _TraitsT>
+ void
+ _NFA<_TraitsT>::_M_eliminate_dummy()
{
- if (_M_end2 != _S_invalid_state_id)
- {
- if (_M_end2 == _M_end1)
- _M_nfa[_M_end2]._M_alt = __id;
- else
- _M_nfa[_M_end2]._M_next = __id;
- _M_end2 = _S_invalid_state_id;
- }
- if (_M_end1 != _S_invalid_state_id)
- _M_nfa[_M_end1]._M_next = __id;
- _M_end1 = __id;
+ for (auto& __it : *this)
+ {
+ while (__it._M_next >= 0 && (*this)[__it._M_next]._M_opcode()
+ == _S_opcode_dummy)
+ __it._M_next = (*this)[__it._M_next]._M_next;
+ if (__it._M_has_alt())
+ while (__it._M_alt >= 0 && (*this)[__it._M_alt]._M_opcode()
+ == _S_opcode_dummy)
+ __it._M_alt = (*this)[__it._M_alt]._M_next;
+ }
}
- template<typename _CharT, typename _TraitsT>
- void _StateSeq<_CharT, _TraitsT>::
- _M_append(_StateSeq& __rhs)
+ // Just apply DFS on the sequence and re-link their links.
+ template<typename _TraitsT>
+ _StateSeq<_TraitsT>
+ _StateSeq<_TraitsT>::_M_clone()
{
- if (_M_end2 != _S_invalid_state_id)
- {
- if (_M_end2 == _M_end1)
- _M_nfa[_M_end2]._M_alt = __rhs._M_start;
- else
- _M_nfa[_M_end2]._M_next = __rhs._M_start;
- _M_end2 = _S_invalid_state_id;
- }
- if (__rhs._M_end2 != _S_invalid_state_id)
- _M_end2 = __rhs._M_end2;
- if (_M_end1 != _S_invalid_state_id)
- _M_nfa[_M_end1]._M_next = __rhs._M_start;
- _M_end1 = __rhs._M_end1;
+ _GLIBCXX_STD_C::map<_StateIdT, _StateIdT> __m;
+ std::stack<_StateIdT, _GLIBCXX_STD_C::deque<_StateIdT>> __stack;
+ __stack.push(_M_start);
+ while (!__stack.empty())
+ {
+ auto __u = __stack.top();
+ __stack.pop();
+ auto __dup = _M_nfa[__u];
+ // _M_insert_state() never return -1
+ auto __id = _M_nfa._M_insert_state(std::move(__dup));
+ __m[__u] = __id;
+ if (__dup._M_has_alt())
+ if (__dup._M_alt != _S_invalid_state_id
+ && __m.count(__dup._M_alt) == 0)
+ __stack.push(__dup._M_alt);
+ if (__u == _M_end)
+ continue;
+ if (__dup._M_next != _S_invalid_state_id
+ && __m.count(__dup._M_next) == 0)
+ __stack.push(__dup._M_next);
+ }
+ for (auto __it : __m)
+ {
+ auto __v = __it.second;
+ auto& __ref = _M_nfa[__v];
+ if (__ref._M_next != _S_invalid_state_id)
+ __ref._M_next = __m.find(__ref._M_next)->second;
+ if (__ref._M_has_alt() && __ref._M_alt != _S_invalid_state_id)
+ __ref._M_alt = __m.find(__ref._M_alt)->second;
+ }
+ return _StateSeq(_M_nfa, __m[_M_start], __m[_M_end]);
}
-
- // @todo implement this function.
- template<typename _CharT, typename _TraitsT>
- _StateIdT _StateSeq<_CharT, _TraitsT>::
- _M_clone()
- { return 0; }
+} // namespace __detail
_GLIBCXX_END_NAMESPACE_VERSION
-} // namespace __detail
} // namespace
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