AutomatonComplement.h

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/*
 * This file is part of Algorithms library toolkit.
 * Copyright (C) 2017 Jan Travnicek (jan.travnicek@fit.cvut.cz)
 
 * Algorithms library toolkit 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 of the License, or
 * (at your option) any later version.
 
 * Algorithms library toolkit 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.
 
 * You should have received a copy of the GNU General Public License
 * along with Algorithms library toolkit.  If not, see <http://www.gnu.org/licenses/>.
 */
 
#pragma once
 
#include <automaton/FSM/EpsilonNFA.h>
 
namespace automaton {
 
namespace transform {
 
class AutomatonComplement {
public:
    template < class SymbolType, class StateType >
    static automaton::DFA < SymbolType, StateType > complement ( const automaton::DFA < SymbolType, StateType > & automaton );
};
 
template < class SymbolType, class StateType >
automaton::DFA < SymbolType, StateType > AutomatonComplement::complement ( const automaton::DFA < SymbolType, StateType > & automaton ) {
    // create a complement of automaton's final states
    ext::set < StateType > newFinalStates = automaton.getStates ( );
 
    // FIXME Not working?
    // const ext::set < StateType > & oldFinalStates = automaton.getFinalStates ( );
    // newFinalStates.erase ( oldFinalStates.begin ( ), oldFinalStates.end ( ) );
 
    for ( const auto & fin : automaton.getFinalStates ( ) )
        newFinalStates.erase ( fin );
 
    automaton::DFA < SymbolType, StateType > res ( automaton );
    res.setFinalStates ( newFinalStates );
    return res;
}
 
} /* namespace transform */
 
} /* namespace automaton */