MSCorrParse.h

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00001 //# MSCorrParse.h: Classes to hold results from corr grammar parser
00002 //# Copyright (C) 1994,1995,1997,1998,1999,2000,2001,2003
00003 //# Associated Universities, Inc. Washington DC, USA.
00004 //#
00005 //# This library is free software; you can redistribute it and/or modify it
00006 //# under the terms of the GNU Library General Public License as published by
00007 //# the Free Software Foundation; either version 2 of the License, or (at your
00008 //# option) any later version.
00009 //#
00010 //# This library is distributed in the hope that it will be useful, but WITHOUT
00011 //# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
00012 //# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
00013 //# License for more details.
00014 //#
00015 //# You should have received a copy of the GNU Library General Public License
00016 //# along with this library; if not, write to the Free Software Foundation,
00017 //# Inc., 675 Massachusetts Ave, Cambridge, MA 02139, USA.
00018 //#
00019 //# Correspondence concerning AIPS++ should be addressed as follows:
00020 //#        Internet email: aips2-request@nrao.edu.
00021 //#        Postal address: AIPS++ Project Office
00022 //#                        National Radio Astronomy Observatory
00023 //#                        520 Edgemont Road
00024 //#                        Charlottesville, VA 22903-2475 USA
00025 //#
00026 //# $Id$
00027 
00028 #ifndef MS_MSUVDISTPARSE_H
00029 #define MS_MSUVDISTPARSE_H
00030 
00031 //# Includes
00032 #include <casacore/casa/aips.h>
00033 #include <casacore/ms/MSSel/MSParse.h>
00034 
00035 namespace casacore { //# NAMESPACE CASACORE - BEGIN
00036 
00037 //# Forward Declarations
00038 
00039 // <summary>
00040 // Class to hold values from UV dist grammar parser
00041 // </summary>
00042 
00043 // <use visibility=local>
00044 
00045 // <reviewed reviewer="" date="" tests="">
00046 // </reviewed>
00047 
00048 // <prerequisite>
00049 //# Classes you should understand before using this one.
00050 // </prerequisite>
00051 
00052 // <etymology>
00053 // MSCorrParse is the class used to parse a corr command.
00054 // </etymology>
00055 
00056 // <synopsis>
00057 // MSCorrParse is used by the parser of UV dist sub-expression statements.
00058 // The parser is written in Bison and Flex in files MSCorrGram.y and .l.
00059 // The statements in there use the routines in this file to act
00060 // upon a reduced rule.
00061 // Since multiple tables can be given (with a shorthand), the table
00062 // names are stored in a list. The variable names can be qualified
00063 // by the table name and will be looked up in the appropriate table.
00064 //
00065 // The class MSCorrParse only contains information about a table
00066 // used in the table command. Global variables (like a list and a vector)
00067 // are used in MSCorrParse.cc to hold further information.
00068 //
00069 // Global functions are used to operate on the information.
00070 // The main function is the global function msCorrCommand.
00071 // It executes the given STaQL command and returns the resulting ms.
00072 // This is, in fact, the only function to be used by a user.
00073 // </synopsis>
00074 
00075 // <motivation>
00076 // It is necessary to be able to give a ms command in ASCII.
00077 // This can be used in a CLI or in the table browser to get a subset
00078 // of a table or to sort a table.
00079 // </motivation>
00080 
00081 //# <todo asof="$DATE:$">
00082 //# A List of bugs, limitations, extensions or planned refinements.
00083 //# </todo>
00084 
00085 
00086 class MSCorrParse : public MSParse
00087 {
00088 
00089 public:
00090   // Default constructor
00091   MSCorrParse ();
00092 
00093   // Associate the ms and the shorthand.
00094   MSCorrParse (const MeasurementSet* ms);
00095   
00096   //  ~MSCorrParse() {if (node_p) delete node_p;node_p=0x0;}
00097   // MS selection
00098   const TableExprNode * selectCorrType(const String& corrType);
00099   
00100   // Get table expression node object.
00101   static const TableExprNode* node();
00102   static void cleanup() {if (node_p) delete node_p;node_p=0x0;}
00103   
00104 private:
00105     static TableExprNode *node_p;
00106 };
00107 
00108 } //# NAMESPACE CASACORE - END
00109 
00110 #endif
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