Re: Reference to a subitem

[Marcin Borkowski <mbork@atos.wmid.amu.edu.pl>]

Dnia Sat, Oct 25, 2008 at 02:58:24AM +0200, Diego Depaoli napisał(a):
> 2008/10/23 Wolfgang Schuster <schuster.wolfgang@googlemail.com>:
> >
> > \def\ItemNumber#1%
> >  {\expandafter\doItemNumber#1..\relax}
> >
> > \def\doItemNumber#1.#2.#3\relax
> >  {\doifelsenothing{#2}
> >    {#1}
> >    {#2}}
> >
> > \definereferenceformat[initem][left=\ItemNumber]
> Since I don't speak that language, someone could explain why this code
> doesn't work when I put a stopper in subitemization?
> The standard dot isn't a stopper itself?

This code seems to work (approximately) like this: it expands the "full"
reference, which is:
<number> <dot> <number> <dot> <something, probably space>
and selects "everything from the first dot up to the second one (w/o the
dots themselves).  So I consider it to be a bit dirty hack (sorry,
Wolfgang;)), in a sense that it is not very flexible.

If your stopper is, say ")" (and the second one, say, "]", so you have
references in a strange form like "1)2]"), you might want to say
something like
\def\doItemNumber #1)#2]#3\relax
(the space after \doItemNumber is gobbled by TeX, so it might be present
here or not, it is a matter of taste only).
If you have different stoppers, another approach might be reasonable.  I
can see two possibilities:
1. Get to know _where_ ConTeXt really keeps the relevant info about
labels; if the info about the values (w/o stoppers) is preserved, we are
saved, if not, we've got a problem;
2. so in the latter case we have to (?) use this kind of hacky solution,
which might be something like this (assuming that \stopper and \stopperr
are the first- and second level stoppers respectively):

\edef\sometemporarymacroname{%
  \def\noexpand\doItemNumber ##1\stopper ##2\stopperr ##3\relax
  {\noexpand\doifelsenothing{##2}
    {##1}
    {##2}}%
}%
\sometemporarymacroname

(I'm not sure whether the last percentage sign is needed, but a good
rule of thumb is to put them everywhere after <closing brace> <newline>,
so that the newlines don't get translated into spaces.)

I'm not sure whether this works, though, *please* check it and tell me
(maybe I'm doing some stupid error, please the TeX gurus correct me if
yes).  I hope this is ok, though, because then it my first post to this
list containing actually an _answer_ and not a _question_:))).

> 
> Cheers
> -- 
> Diego Depaoli

Greets

-- 
Marcin Borkowski (http://mbork.pl)

Kim jest ta, co wyłania się z pustyni,
Idzie wsparta na swoim Oblubieńcu?
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