Hello Jonathan,

First a note about two other answers I got in private e-mail:

* Luis: the predicate name/2 is not enough, because I was to stringigy terms, not just atoms.

* Jason sent me code that does it; thanks Jason. However the question was rather if there is a way to re-use the code that is already there in the Prolog library.

On Thu, May 08, 2003 at 05:18:38PM +0200, Jonathan Hodgson wrote:

stringifying 9or atomifying) things is soemthing one needs to do a lot. Perhaps we should look into the "informal" prolog standard group. Most implmentatation provide some way to do it so we really need a simple common name and mode for it.

SWI Prolog has not only 'format/2' and 'format/3' predicates, but also an 'sformat/3' which emits its result to a string, which I found very convenient. For the problem I mentioned, we can use the "~w" formatter.

However, the stream concept of all Prolog implementations I know seems very old-fashioned to me; doesn't any give the user a way to define his own streams (i.e. objects that would be usable in lieu of streams in the built-in predicates, but whose byte-level read and write operations are user-defined predicates) ? That would nicely solve this and other problems.

A bientôt,

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