Re: [eclipse-clp-users] Consult failure

From: Kish Shen <kisshen_at_...5...>
Date: Fri, 19 Aug 2011 02:59:13 +0100
Hi Jan,

On 18/08/2011 17:23, Jan Burse wrote:
>
>
> expr(Z) -->  "-", !, term(X), {Y is -X}, expr_rest(Y,Z).
> expr(Y) -->  term(X), expr_rest(X,Y).
>
> expr_rest(X,T) -->  "+", !, term(Y), {Z is X+Y}, expr_rest(Z,T).
> expr_rest(X,T) -->  "-", !, term(Y), {Z is X-Y}, expr_rest(Z,T).
> expr_rest(X,X) -->  [].
>
> etc..
>
> And I get the following error:
>
> uncaught exception in exit_block(-127)
> Abort
>

127 (-127) is the error number, which is "syntax error : grammar rule 
body is not valid". The errpr is not properly processed, which is why 
you see the exit_block instead of the actual error. We will look into 
fixing this.

So the error is because the grammar rule you wrote is not valid for 
ECLiPSe -- this is because ECLiPSe have proper strings (as an atomic 
type), so the strings such as "." are real strings, and not list of 
ASCII code, and this is causing the error.

Cheers,

Kish

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Received on Fri Aug 19 2011 - 01:59:23 CEST

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