RegionTextParser.h

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//# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
//# License for more details.
//#
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//# Inc., 675 Massachusetts Ave, Cambridge, MA 02139, USA.
//#
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//#        Internet email: aips2-request@nrao.edu.
//#        Postal address: AIPS++ Project Office
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#ifndef IMAGES_ASCIIANNOTATIONFILEPARSER_H
#define IMAGES_ASCIIANNOTATIONFILEPARSER_H

#include <casa/aips.h>
#include <casa/Arrays/Vector.h>
#include <casa/Containers/Record.h>
#include <casa/Logging/LogIO.h>
#include <casa/OS/RegularFile.h>
#include <casa/Utilities/Regex.h>
#include <imageanalysis/Annotations/AnnotationBase.h>
#include <imageanalysis/IO/AsciiAnnotationFileLine.h>


#include <coordinates/Coordinates/CoordinateSystem.h>

namespace casa {

// <summary>
// Parse and store regions and annotations from an ascii region file
// </summary>
// <author>Dave Mehringer</author>
// <use visibility=export>
// <reviewed reviewer="" date="yyyy/mm/dd" tests="" demos="">
// </reviewed>
// <prerequisite>

// </prerequisite>

// <etymology>
// This is a class designed to parse and store regions and annotations from an ascii region file
// </etymology>

// <synopsis>
// This class is for parsing and storing regions and annotations from an ascii region file .
// See the region file format proposal attached to CAS-2285 (https://bugs.nrao.edu/browse/CAS-2285)
// </synopsis>
// <note>
// This class will create AnnotationBase pointers via new(). It is assumed the caller will
// make use of these pointers so they are not deleted upon deletion of the object. It is
// the caller's responsibility to delete them. To do so, call getLines() and loop through
// the returned Vector of AsciiRegionLines. For objects of type AsciiRegionLines::ANNOTATION,
// get the pointer and delete it.

class RegionTextParser {

public:

        static const Int CURRENT_VERSION;
        static const Regex MAGIC;

        // because of nonstandard access patterns, be careful when using ParamValue and ParamSet
        // outside this class. These should probably be made into full fledged classes at some
        // point.
        struct ParamValue {
                Double doubleVal;
                Int intVal;
                String stringVal;
                Bool boolVal;
                AnnotationBase::LineStyle lineStyleVal;
                AnnotationBase::FontStyle fontStyleVal;
                Vector<MFrequency> freqRange;
                Vector<Stokes::StokesTypes> stokes;
                AnnotationBase::RGB color;
                vector<Int> intVec;
        };

        typedef std::map<AnnotationBase::Keyword, ParamValue> ParamSet;

        // <group>
        // differentiating between the filename and simple text constructors
        RegionTextParser(
                const String& filename, const CoordinateSystem& csys,
                const IPosition& imShape,
                const Int requireAtLeastThisVersion
        );

        RegionTextParser(
                const CoordinateSystem& csys, const IPosition& imShape, const String& text
        );
        //</group>

        ~RegionTextParser();

        Int getFileVersion() const;

        Vector<AsciiAnnotationFileLine> getLines() const;

        // get the parameter set from a line of <src>text</src>. <src>preamble</src> is prepended to exception messages.
        static ParamSet getParamSet(
                Bool& spectralParmsUpdated,
                LogIO& log, const String& text, const String& preamble,
                const CoordinateSystem& csys
        );

private:

        const static String sOnePair;
        const static String bTwoPair;
        const static String sNPair;
        const static Regex startOnePair;
        const static Regex startNPair;

        CoordinateSystem _csys;
        std::auto_ptr<LogIO> _log;
        ParamSet _currentGlobals;
        Vector<AsciiAnnotationFileLine> _lines;
        Vector<AnnotationBase::Keyword> _globalKeysToApply;
        Int _fileVersion;
        IPosition _imShape;
        uInt _regions;

        RegionTextParser() {}

        RegionTextParser& operator=(const RegionTextParser&);

        void _parse(const String& contents, const String& fileDesc);

        Array<String> _extractTwoPairs(uInt& end, const String& string) const;

        // extract s1 and s2 from a string of the form "[s1, s2]"
        static Vector<String> _extractSinglePair(const String& string);

        void _addLine(const AsciiAnnotationFileLine& line);

        AnnotationBase::Type _getAnnotationType(
                Vector<Quantity>& qDirs,
                Vector<Quantity>& qunatities,
                String& textString,
                String& consumeMe, const String& preamble
        ) const;

        ParamSet _getCurrentParamSet(
                Bool& spectralParmsUpdated, ParamSet& newParams,
                String& consumeMe, const String& preamble
        ) const;

        void _createAnnotation(
                const AnnotationBase::Type annType,
                //const Vector<MDirection> dirs,
                const Vector<Quantity>& qDirs,
                const Vector<Quantity>& qFreqs,
                const Vector<Quantity>& quantities,
                const String& textString,
                const ParamSet& currentParamSet,
                const Bool annOnly, const Bool isDifference,
                const String& preamble
        );

        Vector<Quantity> _quantitiesFromFrequencyString(
                const String& freqString,
                const String& preamble
        ) const;

        static String _doLabel(String& consumeMe, const String& logPreamble);

        static String _getKeyValue(String& consumeMe, const String& preamble);

        Vector<Quantity> _extractQuantityPairAndSingleQuantity(
                String& consumeMe, const String& preamble
        ) const;

        Vector<Quantity> _extractNQuantityPairs(
                        String& consumeMe, const String& preamble
        ) const;

        Vector<Quantity> _extractTwoQuantityPairs(
                String& consumeMe, const String& preamble
        ) const;

        Vector<Quantity> _extractSingleQuantityPair(
                const String& pair, const String& preamble
        ) const;

        void _setInitialGlobals();

        static Vector<Stokes::StokesTypes> _stokesFromString(
                const String& stokes, const String& preamble
        );

        Vector<Quantity> _extractTwoQuantityPairsAndSingleQuantity(
                String& consumeMe, const String& preamble
        ) const;

        void _extractQuantityPairAndString(
                Vector<Quantity>& quantities, String& string,
                String& consumeMe, const String& preamble,
                const Bool requireQuotesAroundString
        ) const;

        Vector<Quantity> _extractQuantitiesFromPair(
                const String& pair, const String& preamble
        ) const;

        void _determineVersion(
                const String& chunk, const String& filename,
                const Int requireAtLeastThisVersion
        );


};
}

#endif