MSSpwParse.h
Classes
- MSSpwParse -- Class to hold values from field grammar parser (full description)
Interface
- Public Members
- MSSpwParse ()
- MSSpwParse (const MeasurementSet* ms)
- const TableExprNode *selectSpwIdsFromIDList(const Vector<Int>& fieldIds)
- const TableExprNode *selectSpwIdsFromFreqList(const Vector<Float>& fieldIds, const Float factor)
- static const TableExprNode* node()
Prerequisite
Etymology
MSSpwParse is the class used to parse a spectral window selection command.
Synopsis
MSSpwParse is used by the parser of spectral window
(Spw) sub-expression statements. The parser is written in Bison
and Flex in files MSSpwGram.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 MSSpwParse only contains information about a table
used in the table command. Global variables (like a list and a vector)
are used in MSSpwParse.cc to hold further information.
Global functions are used to operate on the information.
The main function is the global function msSpwCommand.
It executes the given STaQL command and returns the resulting ms.
This is, in fact, the only function to be used by a user.
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.
Member Description
Default constructor
Associate the ms and the shorthand.
const TableExprNode *selectSpwOrSource(const String& fieldName);
Get table expression node object.