This program uses the CommandLine library (cllib), for user interface and the off-line data analysis library for doing I/O to the visibility database written in the GMRT native data recording format.
To produce the output as specified by the format string, the program needs to interpret the format string. However, for efficiency reasons, the program interprets the format string and compiles it into a linked list. Once the format string is so compiled, the application ``executes'' this list for every selected time stamp.
The details about the compilation and execution of the format string are given below.