context.hh

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/*===========================================================================*\
*                                                                            *
*   $Revision$                                                       *
*   $LastChangedBy$                                                *
*   $Date$                     *
*                                                                            *
\*===========================================================================*/

#ifndef VSI_CONTEXT_HH
#define VSI_CONTEXT_HH

//== INCLUDES =================================================================
#include <QVector>
#include <QStringList>
#include <QXmlQuery>

#include "element.hh"

//== FORWARDDECLARATIONS ======================================================
class QScriptEngine;

//== NAMESPACES ===============================================================
namespace VSI {

//== FORWARDDECLARATIONS ======================================================
class Input;
class Output;
class InOut;
class Type;

//== CLASS DEFINITION =========================================================

class Context {

  public:
    Context (QScriptEngine *_engine);

    ~Context ();

    void parse (QByteArray _xml);

    const QVector<Element *>& elements () const { return elements_; };

    QVector<Element *> elements (QString _category);

    Element *element (QString _name);

    QStringList categories ();

    void registerType (Type *_type);

    bool typeSupported (QString _type);

    Type *getType (QString _type);

    bool canConvert (QString _type1, QString _type2);

    QScriptEngine *scriptEngine () { return scriptEngine_; };

    static bool strToBool (QString _str);

    static QString getXmlString (QXmlQuery &_xml, QString _expr, QString _default = "");

  private:

    // parse element from xml
    void parseElement (QXmlQuery &_xml);

    // parse element input from xml
    Input *parseInput (QXmlQuery &_xml, Element *_e);

    // parse element output from xml
    Output *parseOutput (QXmlQuery &_xml, Element *_e);

    // parse element function from xml
    Function *parseFunction (QXmlQuery &_xml, Element *_e);

    // parse common input and output parts from xml
    bool parseInOutBase (QXmlQuery &_xml, InOut *_io);

  private:
    QVector <Element *> elements_;

    QMap <QString, Type*> supportedTypes_;

    QList <Type *> types_;

    QScriptEngine *scriptEngine_;
};

//=============================================================================
}
//=============================================================================

#endif