MSStateParse.h

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//# MSStateParse.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
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//# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
//# License for more details.
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//# $Id:$

#ifndef MS_MSSTATEPARSE_H
#define MS_MSSTATEPARSE_H

//# Includes
#include <ms/MeasurementSets/MSParse.h>
#include <ms/MeasurementSets/MSSelectionError.h>
namespace casa { //# NAMESPACE CASA - 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>
// MSStateParse is the class used to parse a field command.
// </etymology>

// <synopsis>
// MSStateParse is used by the parser of field sub-expression statements.
// The parser is written in Bison and Flex in files MSStateGram.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 MSStateParse only contains information about a table
// used in the table command. Global variables (like a list and a vector)
// are used in MSStateParse.cc to hold further information.
//
// Global functions are used to operate on the information.
// The main function is the global function msStateCommand.
// 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 MSStateParse : public MSParse
{
public:
  // Default constructor
  MSStateParse ();
  // Associate the ms and the shorthand.
  MSStateParse (const MeasurementSet* ms);

  const TableExprNode* selectStateIds(const Vector<Int>& stateIDs);

    // Get table expression node object.
  static const TableExprNode* node();
  static MSStateParse* thisMSSIParser;
  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 CASA - END

#endif