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devel / comp.lang.prolog / Re: About the Operator '|' and the DCG Draft

Re: About the Operator '|' and the DCG Draft

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Subject: Re: About the Operator '|' and the DCG Draft
From: burse...@gmail.com (Mostowski Collapse)
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by: Mostowski Collapse - Sat, 9 Apr 2022 12:17 UTC

Can he use his SWIPL example to figure out whats going wrong here:

/* SWI-Prolog */
?- op(9,fy,fy), op(9,yfx,yfx).
true.

?- X = (fy 1 yfx 2), write_canonical(X), nl.
yfx(fy(1),2)

Maybe its just a small bug, like (>=)/2 instead of (>)/2 or somesuch.

I am refering to:
https://github.com/ridgeworks/pPEGpl/tree/main/Examples/SWIP-grammar

Mostowski Collapse schrieb am Samstag, 9. April 2022 um 12:51:13 UTC+2:
> Now I found a test case where SWI-Prolog and
> Scryer Prolog differ in parsing:
>
> /* SWI-Prolog */
> ?- op(9,fy,fy), op(9,yfx,yfx).
> true.
>
> ?- X = (fy 1 yfx 2), write_canonical(X), nl.
> yfx(fy(1),2)
>
> But then:
>
> /* Scryer Prolog */
> ?- op(9,fy,fy), op(9,yfx,yfx).
> true.
>
> ?- X = (fy 1 yfx 2), write_canonical(X), nl.
> fy(yfx(1,2))
>
> Was worried what Dogelog Player does. But it seems Dogelog Player
> sides with Scryer Prolog, also GNU Prolog, Tau Prolog and
> formerly Jekejeke Prolog do.

Subject	Author
About the Operator '\|' and the DCG Draft	Mostowski Collapse