On 12/27/18 11:08 PM, Henri Menke wrote: > On 12/27/18 10:43 PM, Floris van Manen wrote: >> When trying to typeset, luatex kept complaining about incorrect parameters >> for ‘minus’. >> There is no \minus command in the source however. >> So it turns out that the combination of using \quad with ‘plus’, 'minus', >> and some more make the error appear. >> If i rewrite minus by {minus} the error does not show up either. > > That's because the skips in spac-hor.mkiv are defined like this > > \unexpanded\def\enskip{\hskip.5\emwidth} > \unexpanded\def\quad {\hskip \emwidth} > \unexpanded\def\qquad {\hskip 2\emwidth} > > The syntax for the \hskip primitive is > > \hskip<glue> > > and the definition of <glue> is > > <dimen>plus<dimen>minus<dimen> > > So “\quad minuskel” will expand to “\hskip\emwidth minuskel”. You see > what's going to happen? The “minus” will be interpreted as part of the > glue definition but no <dimen> is following it, so you get an error. To > fix the bug, the definitions in spac-hor.mkiv have to changed > > \unexpanded\def\enskip{\hskip.5\emwidth\relax} > \unexpanded\def\quad {\hskip \emwidth\relax} > \unexpanded\def\qquad {\hskip 2\emwidth\relax} > > As a temporary workaround you can also just copy them into your document.
There is even a comment in the TeXbook about this exact issue. \danger Horizontal glue is created in the same way, but with ^|\hskip| instead of\/ ^|\vskip|. For example, plain \TeX\ defines ^|\enskip| as an abbreviation for the command `|\hskip.5em\relax|'; this skips horizontally by one ``^{en},'' i.e., by exactly half of an em in the current font. There is no stretching or shrinking in an |\enskip|. The control sequence ^|\relax| after `|.5em|' prevents \TeX\ from thinking that a ^{keyword} is present, in case the text following |\enskip| just happens to begin with `|plus|' or `|minus|'. > >> >> >> \starttext >> \quad minuskel >> \stoptext >> >> >> Where do i go wrong? >> >> Thanks. >> Floris >> >> >> ___________________________________________________________________________________ >> If your question is of interest to others as well, please add an entry to >> the Wiki! >> >> maillist : ntg-context@ntg.nl / >> http://www.ntg.nl/mailman/listinfo/ntg-context >> webpage : http://www.pragma-ade.nl / http://context.aanhet.net >> archive : https://bitbucket.org/phg/context-mirror/commits/ >> wiki : http://contextgarden.net >> ___________________________________________________________________________________ >> > ___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://context.aanhet.net archive : https://bitbucket.org/phg/context-mirror/commits/ wiki : http://contextgarden.net ___________________________________________________________________________________