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Date:         Sun, 14 Sep 2008 10:17:08 +0100
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From: Chris Rowley <C.A.Rowley@OPEN.AC.UK>
Subject: Re: Generic quark test
To: LATEX-L@LISTSERV.UNI-HEIDELBERG.DE
In-Reply-To:  <97AFAC39-1BDF-4EEB-8498-011976315F19@gmail.com>
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Status: R

Will

Some ideas in private as this is displacement activity for me this week (two
papers to finish, plus the 'mathematical part' of the new Content
MathML part of the spec) and so I do not want to get dragged into
lengthy discussions on public lists.  You are welcome to cut parts of
this onto the list.

> > \def_new:Npn \if_quark:wT #1#2#3\q_stop {
> > \int_compare:nNnT {\char_value_uccode:n{#2}} = {`Q}
> > }

Assuming my detective faculties have not completely siezed up, what is
being attempted here is to test with expansion only the first letter
of the 'name of the quark'.

One challenge, as I see it, is to build expandable tests for arbitrary
(prefix) strings.  This may not be a 5-star challenge with e-TeX?

Then we could have a longer prefix such as your \q_quark for all
quarks (and hope that no idiot uses the prefix for anything else).

To better avoid such idiocy it could be arbitrarily wierd, eg:

   \q_Q__K_ ... 


>    \def_new:Npn \quark_new:N #1{\tlp_new:Nn #1{\q_quark#1}}

The creator then needs to be (in possibly correct, or possibly pseudo,
code??):

   \def_new:Npn \quark_new:n #1{\tlp_new:cn {q_Q_K_#1}{\q_Q_K_#1}}

Makes sense?  ... maybe.


chris