[antlr-interest] Having the "include" file as part the AST

[Silvain Piree]

> I am struggling with the INCLUDE file mechanism.  It hides 
> the INCLUDE file statement from the main parser. 
> An INCLUDE statement is not part of the C language.  

There are several constructs in JCL that need to be handled 
before actual parsing can be performed, e.g.

- symbol substitution (EXEC PROC, SET, PROC, etc.)
- file include (EXEC PROC, INCLUDE)
- inline data (DD *, DD DLM=...)
- etc.

I would advise you to take the preprocessor route. It would be 
VERY difficult to build a one-pass parser that does both
preprocessing and parsing.

In fact, even the preprocessing of JCL is pretty complex.

Hope this helps, kind greetings,

Silvain Piree
Refactive (www.refactive.com)


 

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