AutomatonIteration.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 AutomatonIteration {
public:
    template < class Automaton >
    requires isDFA < Automaton > || isNFA < Automaton >
    static automaton::NFA < typename Automaton::SymbolType, typename Automaton::StateType > iteration ( const Automaton & automaton );
};
 
template < class Automaton >
requires isDFA < Automaton > || isNFA < Automaton >
automaton::NFA < typename Automaton::SymbolType, typename Automaton::StateType > AutomatonIteration::iteration ( const Automaton & automaton ) {
    automaton::NFA < typename Automaton::SymbolType, typename Automaton::StateType > res(automaton);
 
    typename Automaton::StateType newInitialState = common::createUnique(automaton.getInitialState(), automaton.getStates());
    res.addState(newInitialState);
 
    for(const auto& t : automaton.getTransitionsFromState(automaton.getInitialState())) {
        res.addTransition(newInitialState, t.first.second, t.second);
        if (automaton.getFinalStates().contains(t.second)) {
            res.addTransition(newInitialState, t.first.second, automaton.getInitialState());
        }
    }
 
    for(const auto& qf : res.getFinalStates())
        for(const auto& t : res.getTransitionsToState(qf))
            res.addTransition(t.first.first, t.first.second, res.getInitialState());
 
    res.setInitialState(newInitialState);
    res.addFinalState(newInitialState);
 
    return res;
}
 
} /* namespace transform */
 
} /* namespace automaton */