MSObservationGram.h

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//# MSObservationGram.h: Grammar for ms scan sub-expressions
//# Copyright (C) 1998
//# 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: aips2-request@nrao.edu.
//#        Postal address: AIPS++ Project Office
//#                        National Radio Astronomy Observatory
//#                        520 Edgemont Road
//#                        Charlottesville, VA 22903-2475 USA
//#
//# $Id$

#ifndef MS_MSOBSERVATIONGRAM_H
#define MS_MSOBSERVATIONGRAM_H


//# Includes
#include <casacore/casa/aips.h>
#include <casacore/ms/MSSel/MSObservationParse.h> 
#include <casacore/casa/BasicSL/String.h>

namespace casacore { //# NAMESPACE CASACORE - BEGIN

//# Forward Declarations
class MeasurementSet;
class TableExprNode;

// <summary>
// Global functions for flex/bison scanner/parser for MSObservationGram
// </summary>

// <use visibility=local>

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

// <prerequisite>
//# Classes you should understand before using this one.
//  <li> MSObservationGram.l and .y  (flex and bison grammar)
// </prerequisite>

// <synopsis> 
// Global functions are needed to define the input of the flex scanner
// and to start the bison parser.
// The input is taken from a string.
// </synopsis> 

// <motivation>
// It is necessary to be able to give an image expression in ASCII.
// This can be used in glish.
// </motivation>
// <todo asof="$DATE:$">
//# A List of bugs, limitations, extensions or planned refinements.
// </todo>
  
  
// <group name=MSObservationGramFunctions>
  
// Declare the bison parser (is implemented by bison command).
  TableExprNode msObservationGramParseCommand (const MeasurementSet *ms, 
                                               const MSObservation& obsSubTable,
                                               const TableExprNode& colAsTEN,
                                               const String& command, 
                                               Vector<Int>& idList);
  
  TableExprNode baseMSObservationGramParseCommand (MSObservationParse* parser, 
                                                   const TableExprNode& colAsTEN,
                                                   const String& command, 
                                                   Vector<Int>& selectedIDs);
  // The yyerror function for the parser.
  // It throws an exception with the current token.
  void MSObservationGramerror (const char*);
  
  // Give the table expression node.
  //const TableExprNode *msObservationGramParseNode();
  void msObservationGramParseDeleteNode();
  
  // Give the current position in the string.
  // This can be used when parse errors occur.
  Int& msObservationGramPosition();
  
  // Declare the input routine for flex/bison.
  int msObservationGramInput (char* buf, int max_size);
  
  // A function to remove escaped characters.
  //String msObservationGramRemoveEscapes (const String& in);
  
  // A function to remove quotes from a quoted string.
  //String msObservationGramRemoveQuotes (const String& in);
  
  // </group>
  
} //# NAMESPACE CASACORE - END

#endif