//# MSFieldParse.h: Classes to hold results from field 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_MSFIELDPARSE_H
#define MS_MSFIELDPARSE_H

//# Includes
#include <casacore/casa/aips.h>
#include <casacore/ms/MeasurementSets/MSField.h>
#include <casacore/ms/MeasurementSets/MSFieldColumns.h>
#include <casacore/ms/MSSel/MSParse.h>
#include <casacore/ms/MSSel/MSSelectionError.h>
#include <casacore/ms/MSSel/MSSelectableTable.h>
namespace casacore { //# NAMESPACE CASACORE - BEGIN

//# Forward Declarations


// <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>

// <summary>
// Class to hold values from field grammar parser
// </summary>

// <use visibility=local>

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

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

// <etymology>
// MSFieldParse is the class used to parse a field command.
// </etymology>

// <synopsis>
// MSFieldParse is used by the parser of field sub-expression statements.
// The parser is written in Bison and Flex in files MSFieldGram.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 MSFieldParse only contains information about a table
// used in the table command. Global variables (like a list and a vector)
// are used in MSFieldParse.cc to hold further information.
//
// Global functions are used to operate on the information.
// The main function is the global function msFieldCommand.
// 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>

  class MSFieldParse : public MSParse
  {
    
  public:
    // Default constructor
    MSFieldParse ();
    MSFieldParse (const MeasurementSet* ms);
    MSFieldParse (const MSField& fieldSubTable, const TableExprNode& columnAsTEN);
    ~MSFieldParse() {columnAsTEN_p=TableExprNode();}

    const TableExprNode *selectFieldIds(const Vector<Int>& fieldIds);
    
    // Get table expression node object.
    static const TableExprNode* node();
    static MSFieldParse* thisMSFParser;
    static Vector<Int> selectedIDs() {return idList;}
    static void reset();
    static void cleanup() 
    {if (node_p) delete node_p;node_p=0x0;}
    MSField& subTable() {return msFieldSubTable_p;}
  private:
    static TableExprNode* node_p;
    const String colName;
    static  Vector<Int> idList;
    MSField msFieldSubTable_p;
    static TableExprNode columnAsTEN_p;
  };
  
} //# NAMESPACE CASACORE - END

#endif


//---------------------OLD CODE START (Feb. 2012)-------------------
// #ifndef MS_MSFIELDPARSE_H
// #define MS_MSFIELDPARSE_H

// //# Includes
// #include <casacore/ms/MSSel/MSParse.h>
// #include <casacore/ms/MSSel/MSSelectionError.h>
// #include <casacore/ms/MSSel/MSSelectableTable.h>
// namespace casacore { //# NAMESPACE CASACORE - BEGIN
  
//   //# Forward Declarations
  
  
//   // <summary>
//   // Class to hold values from field grammar parser
//   // </summary>
  
//   // <use visibility=local>
  
//   // <reviewed reviewer="" date="" tests="">
//   // </reviewed>
  
//   // <prerequisite>
//   //# Classes you should understand before using this one.
//   // </prerequisite>
  
//   // <etymology>
//   // MSFieldParse is the class used to parse a field command.
//   // </etymology>
  
//   // <synopsis>
//   // MSFieldParse is used by the parser of field sub-expression statements.
//   // The parser is written in Bison and Flex in files MSFieldGram.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 MSFieldParse only contains information about a table
//   // used in the table command. Global variables (like a list and a vector)
//   // are used in MSFieldParse.cc to hold further information.
//   //
//   // Global functions are used to operate on the information.
//   // The main function is the global function msFieldCommand.
//   // 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 MSFieldParse : public MSParse
//   {
    
//   public:
//     // Default constructor
//     MSFieldParse ();
//     //  ~MSFieldParse() {idList.resize(0);}
//     // Associate the ms and the shorthand.
//     MSFieldParse (const MeasurementSet* ms);
//     MSFieldParse (MSSelectableTable* msLike);
//     //~MSFieldParse() {if (node_p) delete node_p;node_p=0x0;}
    
//     const TableExprNode *selectFieldIds(const Vector<Int>& fieldIds);
//     //    const TableExprNode *selectFieldOrSource(const String& fieldName);
    
//     // Get table expression node object.
//     static const TableExprNode* node();
//     static MSFieldParse* thisMSFParser;
//     static Vector<Int> selectedIDs() {return idList;}
//     static void reset();//{idList.resize(0);}
//     static void cleanup() {if (node_p) delete node_p;node_p=0x0;}
//   private:
//     static TableExprNode* node_p;
//     const String colName;
//     static  Vector<Int> idList;
    
//   };
  
// } //# NAMESPACE CASACORE - END

// #endif
//---------------------OLD CODE END (Feb. 2012)-------------------
