PERFORM token (was RE: gnubol: Hacks needed to parse COBOL

["William M. Klein" <wmklein@ix.netcom.com>]

> -----Original Message-----
> From: owner-gnu-cobol@wallace.lusars.net
> [mailto:owner-gnu-cobol@wallace.lusars.net]On Behalf Of J & C
> Migrations, Pty.
  <much snippage>
>
> >/* problem 11.
> >   - you need infinite lookahead to determine whether you are expecting a
> >procedure name or an expression after 'perform'.
> >     You could look up the type in the symbol table but what about forward
> >references etc.
>
> I think that with a single look-ahead you can determine whether the word
> that follows the PERFORM is a reserved word such as UNTIL or VARYING, a
> verb, or a user defined word, that must be a procedure name.  Then you can
> either verify a previously tabulated name and issue errors, or tabulate the
> first-used name as a referenced procedure, and leave further error
> reporting to the semantic phase.
>
>

The statement about a user-defined word following PERFORM being a
procedure-name is not correct.

Either
   Perform paragraph-name *> out-of-line PERFORM

        or

   Perform data-name TIMES *> in-line perform

is valid


Bill Klein
  wmklein <at> ix.netcom.com


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