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//==============================================================================
//
// Copyright (c) 2015-
// Authors:
// * Joachim Klein <klein@tcs.inf.tu-dresden.de>
// * David Mueller <david.mueller@tcs.inf.tu-dresden.de>
//
//------------------------------------------------------------------------------
//
// This file is part of the cpphoafparser library,
// http://automata.tools/hoa/cpphoafparser/
//
// The cpphoafparser library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// The cpphoafparser library 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
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
//
//==============================================================================
#ifndef CPPHOAFPARSER_ATOMLABEL_HH
#define CPPHOAFPARSER_ATOMLABEL_HH
#include <memory>
#include <string>
#include <iostream>
namespace cpphoafparser {
/**
* Atom of a label expression (either an atomic proposition index or an alias reference) */ class AtomLabel { public: /** A shared_ptr wrapping an AtomLabel */ typedef std::shared_ptr<AtomLabel> ptr;
/** Static constructor for an atomic proposition atom */ static AtomLabel::ptr createAPIndex(unsigned int apIndex) { return AtomLabel::ptr(new AtomLabel(apIndex)); }
/** Static constructor for an alias reference (name has to be without leading @) */ static AtomLabel::ptr createAlias(const std::string name) { return AtomLabel::ptr(new AtomLabel(name)); }
/** Copy constructor. */ AtomLabel(const AtomLabel& other) : apIndex(0), aliasName(nullptr) { if (other.isAlias()) { aliasName = std::shared_ptr<std::string>(new std::string(*other.aliasName)); } else { apIndex = other.apIndex; } }
/** Returns true if this atom is an alias reference */ bool isAlias() const {return (bool)aliasName;}
/**
* Returns the alias name (for an alias reference atom). * May only be called if `isAlias() == true`. */ const std::string& getAliasName() const { if (!isAlias()) {throw std::logic_error("Illegal access");} return *aliasName; }
/**
* Returns the atomic proposition index (for an AP atom). * May only be called if `isAlias() == false`. */ unsigned int getAPIndex() const { if (isAlias()) {throw std::logic_error("Illegal access");} return apIndex; }
/** Output operator, renders in HOA syntax */ friend std::ostream& operator<<(std::ostream& out, const AtomLabel& atom) { if (atom.isAlias()) { out << "@" << *atom.aliasName; } else { out << atom.apIndex; } return out; }
/** Equality operator. */ bool operator==(const AtomLabel& other) const { if (isAlias()) { return other.isAlias() && getAliasName() == other.getAliasName(); } else { return !other.isAlias() && getAPIndex() == other.getAPIndex(); } }
private: /** The AP index (if applicable) */ unsigned int apIndex; /** The aliasName (empty pointer if AP atom) */ std::shared_ptr<std::string> aliasName;
/** Private constructor (AP atom) */ AtomLabel(unsigned int apIndex) : apIndex(apIndex), aliasName(nullptr) {} /** Private constructor (alias reference atom) */ AtomLabel(const std::string& name) : apIndex(0), aliasName(new std::string(name)) {} };
}
#endif
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