FormalRegExpElement.h

Go to the documentation of this file.

 
/*
 * 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 <common/DefaultSymbolType.h>
 
namespace regexp {
 
template < class SymbolType >
class FormalRegExpElement;
 
} /* namespace regexp */
 
#include <alib/set>
#include <ext/tree_base>
#include <core/visitor.hpp>
 
#include "../unbounded/UnboundedRegExpElement.h"
 
namespace regexp {
 
template < class SymbolType >
class FormalRegExpAlternation;
template < class SymbolType >
class FormalRegExpConcatenation;
template < class SymbolType >
class FormalRegExpIteration;
template < class SymbolType >
class FormalRegExpSymbol;
template < class SymbolType >
class FormalRegExpEmpty;
template < class SymbolType >
class FormalRegExpEpsilon;
 
template < class SymbolType >
class FormalRegExpElement : public ext::BaseNode < FormalRegExpElement < SymbolType > > {
protected:
    class Visitor {
    public:
        virtual ~Visitor ( ) noexcept = default;
        virtual void visit ( const FormalRegExpAlternation < SymbolType > & ) = 0;
        virtual void visit ( const FormalRegExpConcatenation < SymbolType > & ) = 0;
        virtual void visit ( const FormalRegExpIteration < SymbolType > & ) = 0;
        virtual void visit ( const FormalRegExpSymbol < SymbolType > & ) = 0;
        virtual void visit ( const FormalRegExpEmpty < SymbolType > & ) = 0;
        virtual void visit ( const FormalRegExpEpsilon < SymbolType > & ) = 0;
    };
 
    template < class ReturnType, class Visitor, class ... Params >
    class VisitorContext : public core::VisitorContextAux < ReturnType, Visitor, Params ... >, public FormalRegExpElement::Visitor {
    public:
        using core::VisitorContextAux < ReturnType, Visitor, Params ... >::VisitorContextAux;
 
        void visit ( const FormalRegExpAlternation < SymbolType > & inherit ) override {
            this->call ( inherit, std::make_index_sequence < sizeof ... ( Params ) > { } );
        }
 
        void visit ( const FormalRegExpConcatenation < SymbolType > & inherit ) override {
            this->call ( inherit, std::make_index_sequence < sizeof ... ( Params ) > { } );
        }
 
        void visit ( const FormalRegExpIteration < SymbolType > & inherit ) override {
            this->call ( inherit, std::make_index_sequence < sizeof ... ( Params ) > { } );
        }
 
        void visit ( const FormalRegExpSymbol < SymbolType > & inherit ) override {
            this->call ( inherit, std::make_index_sequence < sizeof ... ( Params ) > { } );
        }
 
        void visit ( const FormalRegExpEmpty < SymbolType > & inherit ) override {
            this->call ( inherit, std::make_index_sequence < sizeof ... ( Params ) > { } );
        }
 
        void visit ( const FormalRegExpEpsilon < SymbolType > & inherit ) override {
            this->call ( inherit, std::make_index_sequence < sizeof ... ( Params ) > { } );
        }
    };
 
    virtual void accept ( FormalRegExpElement::Visitor & visitor ) const = 0;
 
public:
    virtual FormalRegExpElement < SymbolType > * clone ( ) const & = 0;
 
    virtual FormalRegExpElement < SymbolType > * clone ( ) && = 0;
 
    template < class ReturnType, class Visitor, class ... Params >
    ReturnType accept ( Params && ... params ) const {
        VisitorContext < ReturnType, Visitor, Params ... > context ( std::forward < Params > ( params ) ... );
        accept ( context );
        return context.getResult ( );
    }
 
    virtual ext::smart_ptr < UnboundedRegExpElement < SymbolType > > asUnbounded ( ) const = 0;
 
    virtual bool testSymbol ( const SymbolType & symbol ) const = 0;
 
    virtual void computeMinimalAlphabet ( ext::set < SymbolType > & alphabet ) const = 0;
 
    virtual bool checkAlphabet ( const ext::set < SymbolType > & alphabet ) const = 0;
 
    ext::set < SymbolType > computeMinimalAlphabet ( ) const;
 
    virtual ext::smart_ptr < FormalRegExpElement < DefaultSymbolType > > normalize ( ) && = 0;
 
    friend ext::ostream & operator <<( ext::ostream & os, const FormalRegExpElement < SymbolType > & instance ) {
        instance >> os;
        return os;
    }
 
    virtual void operator >>( ext::ostream & ) const = 0;
 
    virtual std::strong_ordering operator <=> ( const FormalRegExpElement < SymbolType > & other ) const = 0;
 
    virtual bool operator == ( const FormalRegExpElement < SymbolType > & other ) const = 0;
 
};
 
template < class SymbolType >
ext::set < SymbolType > FormalRegExpElement < SymbolType >::computeMinimalAlphabet ( ) const {
    ext::set < SymbolType > res;
 
    computeMinimalAlphabet ( res );
    return res;
}
 
} /* namespace regexp */
 
extern template class regexp::FormalRegExpElement < DefaultSymbolType >;