//============================================================================== // // Copyright (c) 2015- // Authors: // * Joachim Klein // * David Mueller // //------------------------------------------------------------------------------ // // 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 #include #include 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 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(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 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