EpsilonRemoverOutgoing.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>
#include <automaton/FSM/MultiInitialStateNFA.h>
#include <automaton/FSM/NFA.h>
#include <automaton/FSM/DFA.h>
 
#include <automaton/properties/EpsilonClosure.h>
 
#include <global/GlobalData.h>
 
namespace automaton {
 
namespace simplify {
 
class EpsilonRemoverOutgoing {
public:
    template < class StateType, class SymbolType >
    static automaton::MultiInitialStateNFA < SymbolType, StateType > remove( const automaton::EpsilonNFA < SymbolType, StateType > & fsm );
 
    template < class StateType, class SymbolType >
    static automaton::NFTA < SymbolType, StateType > remove( const automaton::EpsilonNFTA < SymbolType, StateType > & fta );
 
    template < class StateType, class SymbolType >
    static automaton::MultiInitialStateNFA < SymbolType, StateType > remove( const automaton::MultiInitialStateNFA < SymbolType, StateType > & fsm );
 
    template < class StateType, class SymbolType >
    static automaton::NFA < SymbolType, StateType > remove( const automaton::NFA < SymbolType, StateType > & fsm );
 
    template < class StateType, class SymbolType >
    static automaton::DFA < SymbolType, StateType > remove( const automaton::DFA < SymbolType, StateType > & fsm );
};
 
template < class StateType, class SymbolType >
automaton::DFA < SymbolType, StateType > EpsilonRemoverOutgoing::remove(const automaton::DFA < SymbolType, StateType > & fsm) {
    return fsm;
}
 
template < class StateType, class SymbolType >
automaton::MultiInitialStateNFA < SymbolType, StateType > EpsilonRemoverOutgoing::remove(const automaton::MultiInitialStateNFA < SymbolType, StateType > & fsm) {
    return fsm;
}
 
template < class StateType, class SymbolType >
automaton::NFA < SymbolType, StateType > EpsilonRemoverOutgoing::remove(const automaton::NFA < SymbolType, StateType > & fsm) {
    return fsm;
}
 
template < class StateType, class SymbolType >
automaton::MultiInitialStateNFA < SymbolType, StateType > EpsilonRemoverOutgoing::remove( const automaton::EpsilonNFA < SymbolType, StateType > & fsm ) {
    automaton::MultiInitialStateNFA < SymbolType, StateType > res;
    res.setStates( fsm.getStates() );
    res.setFinalStates( fsm.getFinalStates() );
    res.setInputAlphabet( fsm.getInputAlphabet() );
 
    for( const auto & middle : fsm.getStates( ) ) {
        const ext::set<StateType> middleClosure = automaton::properties::EpsilonClosure::epsilonClosure( fsm, middle );
 
        if( common::GlobalData::verbose ) {
            common::Streams::err << "E-clos(" << middle << ") -> " << middleClosure << std::endl;
        }
 
        for( const auto & symbol : fsm.getInputAlphabet() ) {
            for( const auto& transition : fsm.getTransitions( ) ) {
                if(transition.second != middle ) continue;
                if(transition.first.second != symbol) continue;
 
                for( const auto & to : middleClosure )
                    res.addTransition(transition.first.first, symbol, to );
            }
        }
    }
 
    const ext::set<StateType> cl = automaton::properties::EpsilonClosure::epsilonClosure( fsm, fsm.getInitialState() );
    res.setInitialStates( cl );
 
    return res;
}
 
template < class StateType, class SymbolType >
automaton::NFTA < SymbolType, StateType > EpsilonRemoverOutgoing::remove ( const automaton::EpsilonNFTA < SymbolType, StateType > & fta ) {
    automaton::NFTA < SymbolType, StateType > res;
    res.setStates ( fta.getStates ( ) );
    res.setFinalStates ( fta.getFinalStates ( ) );
    res.setInputAlphabet ( fta.getInputAlphabet ( ) );
 
    ext::multimap < ext::pair < common::ranked_symbol < SymbolType >, ext::vector < StateType > >, StateType > symbolTransitions = fta.getSymbolTransitions ( );
 
    for( const auto & middle : fta.getStates ( ) ) {
        const ext::set < StateType > middleClosure = automaton::properties::EpsilonClosure::epsilonClosure ( fta, middle );
 
        if( common::GlobalData::verbose ) {
            common::Streams::err << "E-clos(" << middle << ") -> " << middleClosure << std::endl;
        }
 
        for ( const auto & symbol : fta.getInputAlphabet ( ) ) {
            for ( const std::pair < const ext::pair < common::ranked_symbol < SymbolType >, ext::vector < StateType > >, StateType > & transition : symbolTransitions ) {
                if ( transition.second != middle ) continue;
                if ( transition.first.first != symbol ) continue;
 
                for ( const auto & to : middleClosure )
                    res.addTransition ( symbol, transition.first.second, to );
            }
        }
    }
 
    return res;
}
 
} /* namespace simplify */
 
} /* namespace automaton */