PL/I preprocessor

The PL/I preprocessor is the preprocessor for the PL/I computer programming language. The preprocessor interprets a subset of the full PL/I language to perform source file inclusion, conditional compilation, and macro expansion. The PL/I preprocessor is the preprocessor for the PL/I computer programming language. The preprocessor interprets a subset of the full PL/I language to perform source file inclusion, conditional compilation, and macro expansion. The preprocessor language has a PL/I-like syntax with preprocessor statements and preprocessor procedures prefixed with a percent symbol (%). Listing-control statements, which supply formatting commands for the compiler listing, are usually considered preprocessor statements and also begin with %. Preprocessor statements are imbedded in and operate on input text. The input text is normally a PL/I program, but is agnostic to the grammar of PL/I, so the preprocessor can also be used independently to process other kinds of text files.