//# MSUvDistParse.h: Classes to hold results from UV dist grammar parser
//# Copyright (C) 1994,1995,1997,1998,1999,2000,2001,2003
//# Associated Universities, Inc. Washington DC, USA.
//#
//# This library is free software; you can redistribute it and/or modify it
//# under the terms of the GNU Library General Public License as published by
//# the Free Software Foundation; either version 2 of the License, or (at your
//# option) any later version.
//#
//# This 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 Library General Public
//# License for more details.
//#
//# You should have received a copy of the GNU Library General Public License
//# along with this library; if not, write to the Free Software Foundation,
//# Inc., 675 Massachusetts Ave, Cambridge, MA 02139, USA.
//#
//# Correspondence concerning AIPS++ should be addressed as follows:
//#        Internet email: casa-feedback@nrao.edu.
//#        Postal address: AIPS++ Project Office
//#                        National Radio Astronomy Observatory
//#                        520 Edgemont Road
//#                        Charlottesville, VA 22903-2475 USA

#ifndef MS_MSUVDISTPARSE_H
#define MS_MSUVDISTPARSE_H

//# Includes
#include <casacore/casa/aips.h>
#include <casacore/ms/MSSel/MSParse.h>
#include <casacore/casa/Arrays/Matrix.h>

namespace casacore { //# NAMESPACE CASACORE - BEGIN

//# Forward Declarations

// <summary>
// Class to hold values from UV dist grammar parser
// </summary>

// <use visibility=local>

// <reviewed reviewer="" date="" tests="">
// </reviewed>

// <prerequisite>
//# Classes you should understand before using this one.
// </prerequisite>

// <etymology>
// MSUvDistParse is the class used to parse a UV dist command.
// </etymology>

// <synopsis>
// MSUvDistParse is used by the parser of UV dist sub-expression statements.
// The parser is written in Bison and Flex in files MSUvDistGram.y and .l.
// The statements in there use the routines in this file to act
// upon a reduced rule.
// Since multiple tables can be given (with a shorthand), the table
// names are stored in a list. The variable names can be qualified
// by the table name and will be looked up in the appropriate table.
//
// The class MSUvDistParse only contains information about a table
// used in the table command. Global variables (like a list and a vector)
// are used in MSUvDistParse.cc to hold further information.
//
// Global functions are used to operate on the information.
// The main function is the global function msUvDistCommand.
// It executes the given STaQL command and returns the resulting ms.
// This is, in fact, the only function to be used by a user.
// </synopsis>

// <motivation>
// It is necessary to be able to give a ms command in ASCII.
// This can be used in a CLI or in the table browser to get a subset
// of a table or to sort a table.
// </motivation>

//# <todo asof="$DATE:$">
//# A List of bugs, limitations, extensions or planned refinements.
//# </todo>


  class MSUvDistParse : public MSParse
  {
    
  public:
    // Default constructor
    MSUvDistParse ();
    
    // Associate the ms and the shorthand.
    MSUvDistParse (const MeasurementSet* ms);
    
    //    ~MSUvDistParse() {if (node_p) delete node_p;node_p=0x0;}
    
    const TableExprNode *selectUVRange(const Double& startUV,
                                       const Double& endUV, 
				       const String& unit,
				       Bool doSlow=False);
    
    Vector<Bool> selectedUnits() {return meterUnits_p;}
    Matrix<Double> selectedUV() {return selectedUV_p;}
    static void reset(){selectedUV_p.resize(2,0);meterUnits_p.resize(0);}
    static void cleanup() {if (node_p) delete node_p;node_p=0x0;}

    // Get table expression node object.
    static const TableExprNode* node();
    static MSUvDistParse* thisMSUParser;
    
  private:
    static TableExprNode* node_p;
    static Matrix<Double> selectedUV_p;
    static Vector<Bool> meterUnits_p;
    void accumulateUVList(const Double r0, const Double r1,
			  const Bool wavelengthUnits, 
			  const Bool meterUnits);
    
  };
  
} //# NAMESPACE CASACORE - END

#endif
