SDF program interface

SDF also provides facilities for reading statements via the SDF user interface, and for analyzing and correcting these statements, for user-defined programs. These programs can thus be operated via the same user interface as the operating system itself.

When a user program is to be used with SDF, the following requirements must be satisfied:

• a syntax description in a syntax file must be created with SDF-A, using statements such as ADD-PROGRAM and ADD-STMT;

• within the program, SDF must be called in order to request the statements, using the SDF macros described in this section or the interface’s function calls between SDF and high-level languages.