GmlParser.h

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#pragma once
 
#include <ogdf/basic/GraphAttributes.h>
#include <ogdf/cluster/ClusterGraph.h>
#include <ogdf/cluster/ClusterGraphAttributes.h>
#include <ogdf/fileformats/GML.h>
 
namespace ogdf {
 
namespace gml {
 
struct OGDF_EXPORT Object {
    Object* pBrother; // brother of node in tree
    Key key; // tag of node
    ObjectType valueType; // type of node
 
    // the entry in the union is selected according to m_valueType:
    //   IntValue -> m_intValue
    //   DoubleValue -> m_doubleValue
    //   StringValue -> m_stringValue
    //   ListBegin -> m_pFirstSon (in case of a list, m_pFirstSon is pointer
    //     to first son and the sons are chained by m_pBrother)
    union {
        int intValue;
        double doubleValue;
        const char* stringValue;
        Object* pFirstSon;
    };
 
    // construction
    Object(Key k, int value)
        : pBrother(nullptr), key(k), valueType(ObjectType::IntValue), intValue(value) { }
 
    Object(Key k, double value)
        : pBrother(nullptr), key(k), valueType(ObjectType::DoubleValue), doubleValue(value) { }
 
    Object(Key k, const char* value)
        : pBrother(nullptr), key(k), valueType(ObjectType::StringValue), stringValue(value) { }
 
    Object(Key k)
        : pBrother(nullptr), key(k), valueType(ObjectType::ListBegin), pFirstSon(nullptr) { }
 
    OGDF_NEW_DELETE
};
 
class OGDF_EXPORT Parser {
    std::istream* m_is;
    bool m_error;
 
    char *m_rLineBuffer, *m_lineBuffer, *m_pCurrent, *m_pStore, m_cStore;
 
    int m_intSymbol;
    double m_doubleSymbol;
    const char* m_stringSymbol;
    Key m_keySymbol;
    string m_longString;
 
    Object* m_objectTree; // root node of GML parse tree
 
    bool m_doCheck;
    Array<node> m_mapToNode;
    Object* m_graphObject;
 
public:
    // construction: creates object tree
    // sets m_error flag if an error occured
    explicit Parser(std::istream& is, bool doCheck = false);
 
    ~Parser();
 
    // true <=> an error in GML files has been detected
    bool error() const { return m_error; }
 
    // creates graph from GML parse tree
    bool read(Graph& G);
    // creates attributed graph from GML parse tree
    bool read(Graph& G, GraphAttributes& GA);
 
    //read only cluster part of object tree and create cluster graph structure
    bool readCluster(Graph& G, ClusterGraph& CG, ClusterGraphAttributes* ACG = nullptr);
 
protected:
    bool recursiveClusterRead(Object* clusterObject, ClusterGraph& CG, cluster c,
            ClusterGraphAttributes* ACG = nullptr);
 
private:
    void createObjectTree(std::istream& is, bool doCheck);
    void setError(const string& errorString, Logger::Level level = Logger::Level::Default);
 
    Object* parseList(ObjectType closingKey);
    ObjectType getNextSymbol();
    bool getLine();
 
    Object* getNodeIdRange(int& minId, int& maxId);
    void readLineAttribute(Object* object, DPolyline& dpl);
 
    void destroyObjectList(Object* object);
};
 
}
 
}