From: Aditya Mahajan <adityam@umich.edu>
To: mailing list for ConTeXt users <ntg-context@ntg.nl>
Subject: Re: Determing if the argument is one character or not
Date: Tue, 3 Feb 2009 20:06:28 -0500 (EST) [thread overview]
Message-ID: <alpine.LNX.2.00.0902032005030.7604@ybpnyubfg.ybpnyqbznva> (raw)
In-Reply-To: <4988D21C.5080101@wxs.nl>
On Wed, 4 Feb 2009, Hans Hagen wrote:
> Aditya Mahajan wrote:
>> Hi,
>>
>> I want to write a macro which behaves differently depending on whether its
>> argumet is a single character or not.
>>
>> \MACRO[a] should give $X_{a}$
>> \MACRO[a:b] should give $X_{[a:b]}$
>>
>> Any hints on how to do this?
>
> \def\MACRO[#1#2]%
> {\doifelsenothing{#2}
> {$X_{#1}$}
> {$X_{[#1#2]}$}}
Duh. I should really try to understand TeX parsing rules some day.
Thanks,
Aditya
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next prev parent reply other threads:[~2009-02-04 1:06 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-02-03 23:11 Aditya Mahajan
2009-02-03 23:24 ` Hans Hagen
2009-02-04 1:06 ` Aditya Mahajan [this message]
2009-02-03 23:53 ` Wolfgang Schuster
2009-02-04 1:07 ` Aditya Mahajan
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