* Determing if the argument is one character or not
@ 2009-02-03 23:11 Aditya Mahajan
2009-02-03 23:24 ` Hans Hagen
2009-02-03 23:53 ` Wolfgang Schuster
0 siblings, 2 replies; 5+ messages in thread
From: Aditya Mahajan @ 2009-02-03 23:11 UTC (permalink / raw)
To: mailing list for ConTeXt users
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?
Thanks,
Aditya
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* Re: Determing if the argument is one character or not
2009-02-03 23:11 Determing if the argument is one character or not Aditya Mahajan
@ 2009-02-03 23:24 ` Hans Hagen
2009-02-04 1:06 ` Aditya Mahajan
2009-02-03 23:53 ` Wolfgang Schuster
1 sibling, 1 reply; 5+ messages in thread
From: Hans Hagen @ 2009-02-03 23:24 UTC (permalink / raw)
To: mailing list for ConTeXt users
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}
{$X_{#1}$}
{$X_{[#1#2]}$}}
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* Re: Determing if the argument is one character or not
2009-02-03 23:11 Determing if the argument is one character or not Aditya Mahajan
2009-02-03 23:24 ` Hans Hagen
@ 2009-02-03 23:53 ` Wolfgang Schuster
2009-02-04 1:07 ` Aditya Mahajan
1 sibling, 1 reply; 5+ messages in thread
From: Wolfgang Schuster @ 2009-02-03 23:53 UTC (permalink / raw)
To: mailing list for ConTeXt users
Am 04.02.2009 um 00:11 schrieb Aditya Mahajan:
> 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?
To test for the number argument use \counttoken(s) and to check
if the string contains a ":" use \doifinstring/\doifinstringelse.
Wolfgang
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* Re: Determing if the argument is one character or not
2009-02-03 23:24 ` Hans Hagen
@ 2009-02-04 1:06 ` Aditya Mahajan
0 siblings, 0 replies; 5+ messages in thread
From: Aditya Mahajan @ 2009-02-04 1:06 UTC (permalink / raw)
To: mailing list for ConTeXt users
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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maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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* Re: Determing if the argument is one character or not
2009-02-03 23:53 ` Wolfgang Schuster
@ 2009-02-04 1:07 ` Aditya Mahajan
0 siblings, 0 replies; 5+ messages in thread
From: Aditya Mahajan @ 2009-02-04 1:07 UTC (permalink / raw)
To: mailing list for ConTeXt users
On Wed, 4 Feb 2009, Wolfgang Schuster wrote:
>
> Am 04.02.2009 um 00:11 schrieb Aditya Mahajan:
>
>> 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?
>
> To test for the number argument use \counttoken(s) and to check
> if the string contains a ":" use \doifinstring/\doifinstringelse.
Thanks. For the moment, I will go with Hans's solution, since it is much
simpler.
Aditya
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2009-02-03 23:11 Determing if the argument is one character or not Aditya Mahajan
2009-02-03 23:24 ` Hans Hagen
2009-02-04 1:06 ` Aditya Mahajan
2009-02-03 23:53 ` Wolfgang Schuster
2009-02-04 1:07 ` Aditya Mahajan
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