Subject: jade or DSSSL: either one is strange - compared to Scheme From: Ralph Ferris <ralph@xxxxxxxxxxxxxxx> Date: Wed, 21 Jul 1999 15:34:50 -0400 |
>Date: Tue, 20 Jul 1999 13:45:32 +0200 >From: Matthias Clasen <clasen@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> >Subject: Re: jade or DSSSL: either one is strange - compared to Scheme > >> Date: Tue, 20 Jul 1999 11:24:27 +0200 (CEST) >> From: Joerg Wittenberger <Joerg.Wittenberger@xxxxxxxxx> >> Organization: softeYes >> X-Url: http://pobox.com/~Joerg.Wittenberger >> Sender: owner-dssslist@xxxxxxxxxxxxxxxx >> Precedence: bulk >> Reply-To: dssslist@xxxxxxxxxxxxxxxx >> >> Hello, >> >> This is a snippet of a DSSSL Style sheet. It should customize Norman >> Walsh's famous docbook style sheets. >> >> The original style sheets labels nested sections to arbitrary >> depth. I'd like to restrict those labels to a level up to three. >> >> Implementation idea >> >> I assumed that I could overwrite the definition of section-autolabel >> (within my derived style sheet) as follows: >> >> (define section-autolabel >> (let ((old-definition section-autolabel)) >> (lambda (nd #!optional (force-label? #f)) >> (let ((depth (node-list-length (ancestor (normalize "section") nd)))) >> (if (> depth 3) >> "" >> (old-definition nd force-label?)))))) >> >> Problem >> >> Unfortunatly jade complains >> >> ...:E: loop in specification of value of "section-autolabel" >> >> Any ideas what's wrong? Is this what the DSSSL spec requires? > >I think that in Scheme, top-level definitions are evaluated sequentially, >enabling redefinitions like the one you showed. But the dsssl expression >language is purely functional and doesn't make promises about the evaluation >order of top-level definitions apart from the one that redefinitions in >later parts are ignored, redefinitions in the same part are an error and >builtin definitions can be overridden. > >Matthias Try using let* (i.e., (let* ((old-definition section-autolabel)) ) to force the binding order and see if that helps. --Ralph DSSSList info and archive: http://www.mulberrytech.com/dsssl/dssslist
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Re: jade or DSSSL: either one is st, Joerg F. Wittenberge | Thread | [OpenJade] OpenJade 1.2.2 Released, Avi Kivity |
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