PL/I Structure Abstract Syntax Tree

The first step in converting a PL/I structure to a COBOL structure is to parse the PL/I structure code into an Abstract Syntax Tree.

In legstar-pli2cob, this is achieved using ANTLR. The starting points are a lexer and a parser grammar.

Most of the parsing code is automatically generated by ANTLR.

The following graph shows all the attributes that are recognized by the parser and how they relate to each other: