RE: gnubol: WHEN and other conditional phrases

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

FYI,
  I believe that the I/O verbs *are* going to (in general) require "look-up"
(to determine access of the file).  It isn't just "matching" conditional
statements, but the simple statement

    Read WhatEver
       Invalid Key
         Display "whatever is invalid"
    End-Read

Requires knowing the ACCESS mode of WhatEver to determine whether or not the
"syntax" is valid.  Given this fact, I *think* that you will be able to use
"incompatible" conditional statements to "implicitly scope terminate"
contained conditionals.

Bill Klein
  wmklein <at> ix.netcom.com

> -----Original Message-----
> From: owner-gnu-cobol@wallace.lusars.net
> [mailto:owner-gnu-cobol@wallace.lusars.net]On Behalf Of Mike Mckernan
> Sent: Wednesday, December 15, 1999 1:31 PM
> To: gnu-cobol@lusars.net
> Subject: Re: gnubol: WHEN and other conditional phrases
>
>
> >>>>> "Bob" == RKRayhawk@aol.com
> >>>>> wrote the following on Wed, 15 Dec 1999 10:11:09 -0500 (EST)
>
>   Bob> In a message dated 12/15/99 8:44:41 AM EST, mck@tivoli.mv.com
>   Bob> writes:
>
>   Bob> Lots of snipping ...  << Essentially, we're parsing as if the
>   Bob> terminators are not required, making diagnosis an incidental
>   Bob> requirement.
>   >>>
>
>   Bob> I think that is an excellent view.  IMHO it leads to tearing
>   Bob> the grammar rules into fragments, and managing considerable
>   Bob> portions of scope issues in action code.
>
> Pro forma disagreement to be noted, of course.
>
>   Bob> (putting asside code base issues for _sequential_ WRITES with
>   Bob> INVALID KEY clauses).  If we do not manifest type then
>
> READ RANDOM-FILE
>      INVALID KEY
>         WRITE SEQUENTIAL-FILE
>      NOT INVALID KEY
>
>   Bob> can not be parsed as discussed by means of grammar rules,
>   Bob> because you are not allowed to reduce that I/O verb in front
>   Bob> of the conditional clause (NOT INVALID KEY) as a simple
>   Bob> imperative, any more than arithmetics can be reduced as simple
>   Bob> imperatives infront of a conditional clause (NOT ON SIZE
>   Bob> ERROR).
>
> You're right, Bob.  This assumes facts not in evidence.  It is only
> possible to parse this as I described with some context awareness.
> Context does not help with the arithmetics, though.
>
> Best regards,
>
> Mike
>
>
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