Hans Hagen wrote:
BILLET Olivier wrote:
By the way, does this include the possibility to treat the character in
different ways depending on the current mode (math/text)?
Because, in the current setting, if you request for 3cm before `:' and
then define a mathematical function $f : R \to Z$ you'll end up with a
huuuge space between f and : which you certainly isn't what you want.
see attached file; taco may know other tricks (i remember that there is
some mechanism in tex for active char treatment in math mode)
It is possible to treat an arbitrary character as if it was \active
inside math mode, but not the other way around: when a character has
catcode \active, it is always treated as that macro, regardless of
the current mode.
For curious people, here is how you make a "mathmode only" macro:
\mathcode`\!="8000
\begingroup
\catcode`\!=13
\gdef!{\it math}
\endgroup
This is a $!$ test!.
Cheers, Taco
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