/*
 Copyright 2019 Alain Dargelas
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at
 
 http://www.apache.org/licenses/LICENSE-2.0
 
 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 */

/* 
 * File:   LoopCheck.h
 * Author: alain
 *
 * Created on May 2, 2017, 8:14 PM
 */

#ifndef LOOPCHECK_H
#define LOOPCHECK_H


namespace SURELOG {

class LoopCheck {
public:
    LoopCheck();
    LoopCheck(const LoopCheck& orig);
    virtual ~LoopCheck();
    
    void clear();
    
    // return true if new edge creates a loop
    bool addEdge(SymbolId from, SymbolId to);
    
    std::vector<SymbolId> reportLoop();
    
private:
   class Node {
   public:
        Node (SymbolId objId) : m_objId(objId), m_visited(false) {}
        SymbolId m_objId;
        std::set<Node*> m_toList; 
        bool m_visited;
    };
    
    std::map<SymbolId, Node*> m_nodes;
};

};

#endif /* LOOPCHECK_H */