mirror of
https://github.com/autc04/Retro68.git
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642 lines
18 KiB
C++
642 lines
18 KiB
C++
// class template regex -*- C++ -*-
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// Copyright (C) 2013-2019 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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/**
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* @file bits/regex_compiler.tcc
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* This is an internal header file, included by other library headers.
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* Do not attempt to use it directly. @headername{regex}
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*/
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// FIXME make comments doxygen format.
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/*
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// This compiler refers to "Regular Expression Matching Can Be Simple And Fast"
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// (http://swtch.com/~rsc/regexp/regexp1.html),
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// but doesn't strictly follow it.
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//
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// When compiling, states are *chained* instead of tree- or graph-constructed.
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// It's more like structured programs: there's if statement and loop statement.
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//
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// For alternative structure (say "a|b"), aka "if statement", two branches
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// should be constructed. However, these two shall merge to an "end_tag" at
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// the end of this operator:
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//
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// branch1
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// / \
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// => begin_tag end_tag =>
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// \ /
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// branch2
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//
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// This is the difference between this implementation and that in Russ's
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// article.
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//
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// That's why we introduced dummy node here ------ "end_tag" is a dummy node.
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// All dummy nodes will be eliminated at the end of compilation.
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*/
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namespace std _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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namespace __detail
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{
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template<typename _TraitsT>
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_Compiler<_TraitsT>::
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_Compiler(_IterT __b, _IterT __e,
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const typename _TraitsT::locale_type& __loc, _FlagT __flags)
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: _M_flags((__flags
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& (regex_constants::ECMAScript
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| regex_constants::basic
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| regex_constants::extended
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| regex_constants::grep
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| regex_constants::egrep
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| regex_constants::awk))
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? __flags
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: __flags | regex_constants::ECMAScript),
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_M_scanner(__b, __e, _M_flags, __loc),
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_M_nfa(make_shared<_RegexT>(__loc, _M_flags)),
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_M_traits(_M_nfa->_M_traits),
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_M_ctype(std::use_facet<_CtypeT>(__loc))
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{
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_StateSeqT __r(*_M_nfa, _M_nfa->_M_start());
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__r._M_append(_M_nfa->_M_insert_subexpr_begin());
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this->_M_disjunction();
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if (!_M_match_token(_ScannerT::_S_token_eof))
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__throw_regex_error(regex_constants::error_paren);
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__r._M_append(_M_pop());
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__glibcxx_assert(_M_stack.empty());
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__r._M_append(_M_nfa->_M_insert_subexpr_end());
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__r._M_append(_M_nfa->_M_insert_accept());
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_M_nfa->_M_eliminate_dummy();
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}
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template<typename _TraitsT>
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void
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_Compiler<_TraitsT>::
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_M_disjunction()
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{
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this->_M_alternative();
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while (_M_match_token(_ScannerT::_S_token_or))
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{
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_StateSeqT __alt1 = _M_pop();
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this->_M_alternative();
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_StateSeqT __alt2 = _M_pop();
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auto __end = _M_nfa->_M_insert_dummy();
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__alt1._M_append(__end);
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__alt2._M_append(__end);
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// __alt2 is state._M_next, __alt1 is state._M_alt. The executor
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// executes _M_alt before _M_next, as well as executing left
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// alternative before right one.
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_M_stack.push(_StateSeqT(*_M_nfa,
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_M_nfa->_M_insert_alt(
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__alt2._M_start, __alt1._M_start, false),
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__end));
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}
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}
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template<typename _TraitsT>
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void
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_Compiler<_TraitsT>::
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_M_alternative()
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{
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if (this->_M_term())
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{
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_StateSeqT __re = _M_pop();
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this->_M_alternative();
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__re._M_append(_M_pop());
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_M_stack.push(__re);
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}
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else
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_M_stack.push(_StateSeqT(*_M_nfa, _M_nfa->_M_insert_dummy()));
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}
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template<typename _TraitsT>
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bool
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_Compiler<_TraitsT>::
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_M_term()
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{
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if (this->_M_assertion())
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return true;
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if (this->_M_atom())
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{
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while (this->_M_quantifier());
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return true;
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}
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return false;
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}
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template<typename _TraitsT>
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bool
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_Compiler<_TraitsT>::
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_M_assertion()
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{
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if (_M_match_token(_ScannerT::_S_token_line_begin))
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_M_stack.push(_StateSeqT(*_M_nfa, _M_nfa->_M_insert_line_begin()));
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else if (_M_match_token(_ScannerT::_S_token_line_end))
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_M_stack.push(_StateSeqT(*_M_nfa, _M_nfa->_M_insert_line_end()));
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else if (_M_match_token(_ScannerT::_S_token_word_bound))
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// _M_value[0] == 'n' means it's negative, say "not word boundary".
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_M_stack.push(_StateSeqT(*_M_nfa, _M_nfa->
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_M_insert_word_bound(_M_value[0] == 'n')));
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else if (_M_match_token(_ScannerT::_S_token_subexpr_lookahead_begin))
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{
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auto __neg = _M_value[0] == 'n';
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this->_M_disjunction();
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if (!_M_match_token(_ScannerT::_S_token_subexpr_end))
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__throw_regex_error(regex_constants::error_paren,
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"Parenthesis is not closed.");
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auto __tmp = _M_pop();
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__tmp._M_append(_M_nfa->_M_insert_accept());
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_M_stack.push(
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_StateSeqT(
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*_M_nfa,
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_M_nfa->_M_insert_lookahead(__tmp._M_start, __neg)));
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}
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else
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return false;
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return true;
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}
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template<typename _TraitsT>
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bool
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_Compiler<_TraitsT>::
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_M_quantifier()
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{
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bool __neg = (_M_flags & regex_constants::ECMAScript);
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auto __init = [this, &__neg]()
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{
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if (_M_stack.empty())
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__throw_regex_error(regex_constants::error_badrepeat,
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"Nothing to repeat before a quantifier.");
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__neg = __neg && _M_match_token(_ScannerT::_S_token_opt);
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};
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if (_M_match_token(_ScannerT::_S_token_closure0))
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{
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__init();
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auto __e = _M_pop();
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_StateSeqT __r(*_M_nfa,
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_M_nfa->_M_insert_repeat(_S_invalid_state_id,
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__e._M_start, __neg));
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__e._M_append(__r);
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_M_stack.push(__r);
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}
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else if (_M_match_token(_ScannerT::_S_token_closure1))
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{
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__init();
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auto __e = _M_pop();
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__e._M_append(_M_nfa->_M_insert_repeat(_S_invalid_state_id,
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__e._M_start, __neg));
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_M_stack.push(__e);
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}
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else if (_M_match_token(_ScannerT::_S_token_opt))
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{
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__init();
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auto __e = _M_pop();
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auto __end = _M_nfa->_M_insert_dummy();
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_StateSeqT __r(*_M_nfa,
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_M_nfa->_M_insert_repeat(_S_invalid_state_id,
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__e._M_start, __neg));
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__e._M_append(__end);
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__r._M_append(__end);
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_M_stack.push(__r);
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}
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else if (_M_match_token(_ScannerT::_S_token_interval_begin))
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{
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if (_M_stack.empty())
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__throw_regex_error(regex_constants::error_badrepeat,
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"Nothing to repeat before a quantifier.");
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if (!_M_match_token(_ScannerT::_S_token_dup_count))
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__throw_regex_error(regex_constants::error_badbrace,
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"Unexpected token in brace expression.");
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_StateSeqT __r(_M_pop());
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_StateSeqT __e(*_M_nfa, _M_nfa->_M_insert_dummy());
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long __min_rep = _M_cur_int_value(10);
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bool __infi = false;
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long __n;
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// {3
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if (_M_match_token(_ScannerT::_S_token_comma))
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if (_M_match_token(_ScannerT::_S_token_dup_count)) // {3,7}
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__n = _M_cur_int_value(10) - __min_rep;
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else
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__infi = true;
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else
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__n = 0;
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if (!_M_match_token(_ScannerT::_S_token_interval_end))
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__throw_regex_error(regex_constants::error_brace,
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"Unexpected end of brace expression.");
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__neg = __neg && _M_match_token(_ScannerT::_S_token_opt);
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for (long __i = 0; __i < __min_rep; ++__i)
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__e._M_append(__r._M_clone());
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if (__infi)
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{
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auto __tmp = __r._M_clone();
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_StateSeqT __s(*_M_nfa,
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_M_nfa->_M_insert_repeat(_S_invalid_state_id,
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__tmp._M_start, __neg));
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__tmp._M_append(__s);
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__e._M_append(__s);
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}
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else
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{
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if (__n < 0)
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__throw_regex_error(regex_constants::error_badbrace,
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"Invalid range in brace expression.");
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auto __end = _M_nfa->_M_insert_dummy();
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// _M_alt is the "match more" branch, and _M_next is the
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// "match less" one. Switch _M_alt and _M_next of all created
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// nodes. This is a hack but IMO works well.
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std::stack<_StateIdT> __stack;
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for (long __i = 0; __i < __n; ++__i)
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{
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auto __tmp = __r._M_clone();
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auto __alt = _M_nfa->_M_insert_repeat(__tmp._M_start,
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__end, __neg);
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__stack.push(__alt);
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__e._M_append(_StateSeqT(*_M_nfa, __alt, __tmp._M_end));
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}
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__e._M_append(__end);
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while (!__stack.empty())
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{
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auto& __tmp = (*_M_nfa)[__stack.top()];
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__stack.pop();
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std::swap(__tmp._M_next, __tmp._M_alt);
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}
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}
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_M_stack.push(__e);
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}
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else
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return false;
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return true;
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}
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#define __INSERT_REGEX_MATCHER(__func, ...)\
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do {\
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if (!(_M_flags & regex_constants::icase))\
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if (!(_M_flags & regex_constants::collate))\
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__func<false, false>(__VA_ARGS__);\
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else\
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__func<false, true>(__VA_ARGS__);\
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else\
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if (!(_M_flags & regex_constants::collate))\
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__func<true, false>(__VA_ARGS__);\
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else\
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__func<true, true>(__VA_ARGS__);\
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} while (false)
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template<typename _TraitsT>
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bool
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_Compiler<_TraitsT>::
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_M_atom()
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{
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if (_M_match_token(_ScannerT::_S_token_anychar))
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{
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if (!(_M_flags & regex_constants::ECMAScript))
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__INSERT_REGEX_MATCHER(_M_insert_any_matcher_posix);
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else
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__INSERT_REGEX_MATCHER(_M_insert_any_matcher_ecma);
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}
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else if (_M_try_char())
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__INSERT_REGEX_MATCHER(_M_insert_char_matcher);
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else if (_M_match_token(_ScannerT::_S_token_backref))
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_M_stack.push(_StateSeqT(*_M_nfa, _M_nfa->
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_M_insert_backref(_M_cur_int_value(10))));
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else if (_M_match_token(_ScannerT::_S_token_quoted_class))
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__INSERT_REGEX_MATCHER(_M_insert_character_class_matcher);
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else if (_M_match_token(_ScannerT::_S_token_subexpr_no_group_begin))
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{
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_StateSeqT __r(*_M_nfa, _M_nfa->_M_insert_dummy());
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this->_M_disjunction();
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if (!_M_match_token(_ScannerT::_S_token_subexpr_end))
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__throw_regex_error(regex_constants::error_paren,
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"Parenthesis is not closed.");
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__r._M_append(_M_pop());
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_M_stack.push(__r);
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}
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else if (_M_match_token(_ScannerT::_S_token_subexpr_begin))
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{
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_StateSeqT __r(*_M_nfa, _M_nfa->_M_insert_subexpr_begin());
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this->_M_disjunction();
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if (!_M_match_token(_ScannerT::_S_token_subexpr_end))
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__throw_regex_error(regex_constants::error_paren,
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"Parenthesis is not closed.");
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__r._M_append(_M_pop());
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__r._M_append(_M_nfa->_M_insert_subexpr_end());
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_M_stack.push(__r);
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}
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else if (!_M_bracket_expression())
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return false;
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return true;
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}
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template<typename _TraitsT>
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bool
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_Compiler<_TraitsT>::
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_M_bracket_expression()
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{
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bool __neg =
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_M_match_token(_ScannerT::_S_token_bracket_neg_begin);
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if (!(__neg || _M_match_token(_ScannerT::_S_token_bracket_begin)))
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return false;
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__INSERT_REGEX_MATCHER(_M_insert_bracket_matcher, __neg);
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return true;
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}
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#undef __INSERT_REGEX_MATCHER
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template<typename _TraitsT>
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template<bool __icase, bool __collate>
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void
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_Compiler<_TraitsT>::
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_M_insert_any_matcher_ecma()
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{
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_M_stack.push(_StateSeqT(*_M_nfa,
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_M_nfa->_M_insert_matcher
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(_AnyMatcher<_TraitsT, true, __icase, __collate>
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(_M_traits))));
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}
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template<typename _TraitsT>
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template<bool __icase, bool __collate>
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void
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_Compiler<_TraitsT>::
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_M_insert_any_matcher_posix()
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{
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_M_stack.push(_StateSeqT(*_M_nfa,
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_M_nfa->_M_insert_matcher
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(_AnyMatcher<_TraitsT, false, __icase, __collate>
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(_M_traits))));
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}
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template<typename _TraitsT>
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template<bool __icase, bool __collate>
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void
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_Compiler<_TraitsT>::
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_M_insert_char_matcher()
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{
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_M_stack.push(_StateSeqT(*_M_nfa,
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_M_nfa->_M_insert_matcher
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(_CharMatcher<_TraitsT, __icase, __collate>
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(_M_value[0], _M_traits))));
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}
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template<typename _TraitsT>
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template<bool __icase, bool __collate>
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void
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_Compiler<_TraitsT>::
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_M_insert_character_class_matcher()
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{
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__glibcxx_assert(_M_value.size() == 1);
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_BracketMatcher<_TraitsT, __icase, __collate> __matcher
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(_M_ctype.is(_CtypeT::upper, _M_value[0]), _M_traits);
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__matcher._M_add_character_class(_M_value, false);
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__matcher._M_ready();
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_M_stack.push(_StateSeqT(*_M_nfa,
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_M_nfa->_M_insert_matcher(std::move(__matcher))));
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}
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template<typename _TraitsT>
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template<bool __icase, bool __collate>
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void
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_Compiler<_TraitsT>::
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_M_insert_bracket_matcher(bool __neg)
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{
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_BracketMatcher<_TraitsT, __icase, __collate> __matcher(__neg, _M_traits);
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pair<bool, _CharT> __last_char; // Optional<_CharT>
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__last_char.first = false;
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if (!(_M_flags & regex_constants::ECMAScript))
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{
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if (_M_try_char())
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{
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__last_char.first = true;
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__last_char.second = _M_value[0];
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}
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else if (_M_match_token(_ScannerT::_S_token_bracket_dash))
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{
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__last_char.first = true;
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__last_char.second = '-';
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}
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}
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while (_M_expression_term(__last_char, __matcher));
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if (__last_char.first)
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__matcher._M_add_char(__last_char.second);
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__matcher._M_ready();
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_M_stack.push(_StateSeqT(
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*_M_nfa,
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_M_nfa->_M_insert_matcher(std::move(__matcher))));
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}
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template<typename _TraitsT>
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template<bool __icase, bool __collate>
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bool
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_Compiler<_TraitsT>::
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_M_expression_term(pair<bool, _CharT>& __last_char,
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_BracketMatcher<_TraitsT, __icase, __collate>& __matcher)
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{
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if (_M_match_token(_ScannerT::_S_token_bracket_end))
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return false;
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const auto __push_char = [&](_CharT __ch)
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{
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if (__last_char.first)
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__matcher._M_add_char(__last_char.second);
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else
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__last_char.first = true;
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__last_char.second = __ch;
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};
|
|
const auto __flush = [&]
|
|
{
|
|
if (__last_char.first)
|
|
{
|
|
__matcher._M_add_char(__last_char.second);
|
|
__last_char.first = false;
|
|
}
|
|
};
|
|
|
|
if (_M_match_token(_ScannerT::_S_token_collsymbol))
|
|
{
|
|
auto __symbol = __matcher._M_add_collate_element(_M_value);
|
|
if (__symbol.size() == 1)
|
|
__push_char(__symbol[0]);
|
|
else
|
|
__flush();
|
|
}
|
|
else if (_M_match_token(_ScannerT::_S_token_equiv_class_name))
|
|
{
|
|
__flush();
|
|
__matcher._M_add_equivalence_class(_M_value);
|
|
}
|
|
else if (_M_match_token(_ScannerT::_S_token_char_class_name))
|
|
{
|
|
__flush();
|
|
__matcher._M_add_character_class(_M_value, false);
|
|
}
|
|
else if (_M_try_char())
|
|
__push_char(_M_value[0]);
|
|
// POSIX doesn't allow '-' as a start-range char (say [a-z--0]),
|
|
// except when the '-' is the first or last character in the bracket
|
|
// expression ([--0]). ECMAScript treats all '-' after a range as a
|
|
// normal character. Also see above, where _M_expression_term gets called.
|
|
//
|
|
// As a result, POSIX rejects [-----], but ECMAScript doesn't.
|
|
// Boost (1.57.0) always uses POSIX style even in its ECMAScript syntax.
|
|
// Clang (3.5) always uses ECMAScript style even in its POSIX syntax.
|
|
//
|
|
// It turns out that no one reads BNFs ;)
|
|
else if (_M_match_token(_ScannerT::_S_token_bracket_dash))
|
|
{
|
|
if (!__last_char.first)
|
|
{
|
|
if (!(_M_flags & regex_constants::ECMAScript))
|
|
{
|
|
if (_M_match_token(_ScannerT::_S_token_bracket_end))
|
|
{
|
|
__push_char('-');
|
|
return false;
|
|
}
|
|
__throw_regex_error(
|
|
regex_constants::error_range,
|
|
"Unexpected dash in bracket expression. For POSIX syntax, "
|
|
"a dash is not treated literally only when it is at "
|
|
"beginning or end.");
|
|
}
|
|
__push_char('-');
|
|
}
|
|
else
|
|
{
|
|
if (_M_try_char())
|
|
{
|
|
__matcher._M_make_range(__last_char.second, _M_value[0]);
|
|
__last_char.first = false;
|
|
}
|
|
else if (_M_match_token(_ScannerT::_S_token_bracket_dash))
|
|
{
|
|
__matcher._M_make_range(__last_char.second, '-');
|
|
__last_char.first = false;
|
|
}
|
|
else
|
|
{
|
|
if (_M_scanner._M_get_token()
|
|
!= _ScannerT::_S_token_bracket_end)
|
|
__throw_regex_error(
|
|
regex_constants::error_range,
|
|
"Character is expected after a dash.");
|
|
__push_char('-');
|
|
}
|
|
}
|
|
}
|
|
else if (_M_match_token(_ScannerT::_S_token_quoted_class))
|
|
{
|
|
__flush();
|
|
__matcher._M_add_character_class(_M_value,
|
|
_M_ctype.is(_CtypeT::upper,
|
|
_M_value[0]));
|
|
}
|
|
else
|
|
__throw_regex_error(regex_constants::error_brack,
|
|
"Unexpected character in bracket expression.");
|
|
|
|
return true;
|
|
}
|
|
|
|
template<typename _TraitsT>
|
|
bool
|
|
_Compiler<_TraitsT>::
|
|
_M_try_char()
|
|
{
|
|
bool __is_char = false;
|
|
if (_M_match_token(_ScannerT::_S_token_oct_num))
|
|
{
|
|
__is_char = true;
|
|
_M_value.assign(1, _M_cur_int_value(8));
|
|
}
|
|
else if (_M_match_token(_ScannerT::_S_token_hex_num))
|
|
{
|
|
__is_char = true;
|
|
_M_value.assign(1, _M_cur_int_value(16));
|
|
}
|
|
else if (_M_match_token(_ScannerT::_S_token_ord_char))
|
|
__is_char = true;
|
|
return __is_char;
|
|
}
|
|
|
|
template<typename _TraitsT>
|
|
bool
|
|
_Compiler<_TraitsT>::
|
|
_M_match_token(_TokenT token)
|
|
{
|
|
if (token == _M_scanner._M_get_token())
|
|
{
|
|
_M_value = _M_scanner._M_get_value();
|
|
_M_scanner._M_advance();
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
template<typename _TraitsT>
|
|
int
|
|
_Compiler<_TraitsT>::
|
|
_M_cur_int_value(int __radix)
|
|
{
|
|
long __v = 0;
|
|
for (typename _StringT::size_type __i = 0;
|
|
__i < _M_value.length(); ++__i)
|
|
__v =__v * __radix + _M_traits.value(_M_value[__i], __radix);
|
|
return __v;
|
|
}
|
|
|
|
template<typename _TraitsT, bool __icase, bool __collate>
|
|
bool
|
|
_BracketMatcher<_TraitsT, __icase, __collate>::
|
|
_M_apply(_CharT __ch, false_type) const
|
|
{
|
|
return [this, __ch]
|
|
{
|
|
if (std::binary_search(_M_char_set.begin(), _M_char_set.end(),
|
|
_M_translator._M_translate(__ch)))
|
|
return true;
|
|
auto __s = _M_translator._M_transform(__ch);
|
|
for (auto& __it : _M_range_set)
|
|
if (_M_translator._M_match_range(__it.first, __it.second, __s))
|
|
return true;
|
|
if (_M_traits.isctype(__ch, _M_class_set))
|
|
return true;
|
|
if (std::find(_M_equiv_set.begin(), _M_equiv_set.end(),
|
|
_M_traits.transform_primary(&__ch, &__ch+1))
|
|
!= _M_equiv_set.end())
|
|
return true;
|
|
for (auto& __it : _M_neg_class_set)
|
|
if (!_M_traits.isctype(__ch, __it))
|
|
return true;
|
|
return false;
|
|
}() ^ _M_is_non_matching;
|
|
}
|
|
} // namespace __detail
|
|
|
|
_GLIBCXX_END_NAMESPACE_VERSION
|
|
} // namespace
|