Re: HELP! Prefix operator precedence error message
From: Jan Wielemaker (jan_at_ct.xs4all.nl)
Date: 04/27/04
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Date: 27 Apr 2004 17:11:08 GMT
In article <ba2190a1.0404270850.3a8e08d8@posting.google.com>,
FirewallVictim wrote:
> Could someone please help/advise with a small prolog problem i'm
> having. Im fairly new to prolog and im only a beginner programmer. I
> developed a small prolog program based on eliza in SWI-prolog for
> windows but when i try and migrate it to UNIX im getting an error
> message. Any advice would be much appreciated.
>
> Code runs in windows but not in unix.
>
> append([],L2,L2).
> append([H|L1],L2,[H|L3]):-
> append(L1,L2,L3).
>
> % Redefine append as ...
>:- op(900,fy,'...').
> ...(X,Y,Z) :- append(X,Z,Y).
>
> response(Response List) -->
> ..._, [keyword], ..._.
>
>
> Error Message: Prefix operator precedence too high (HERE being where
> error occurs)
>
> response(Response List) --> <<HERE>>
> ..._, [keyword], ..._.
>
> I get the feeling unix or prolog doesnt like the use of ... or the way
> the rule is defined. Any pointers?
I don't think Unix can be involved in any way. Neither is SWI-Prolog,
unless it is a modified version. First of all the Windows and Unix
versions are fully compatible, certainly as far as the parser is
concerned. Second, it doesn't know the error message "operator
precedence too high", so it can't be SWI-Prolog :-)
--- Jan
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