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