* Macro with variable number of arguments
@ 2010-02-28 8:54 Otared Kavian
2010-02-28 9:17 ` Wolfgang Schuster
0 siblings, 1 reply; 4+ messages in thread
From: Otared Kavian @ 2010-02-28 8:54 UTC (permalink / raw)
To: mailing list for ConTeXt users
Hi all,
I would like to write a macro which may have sometimes two, sometimes three arguments. The first and the last one are always present, but not necessarily the middle one. The unsatisfactory solution I have now is something like the example below:
\define[2]\myMacroTwo{Name: #1\crlf Email: #2\crlf\thinrule\blank[small]}
\define[3]\myMacroThree{Name: #1\crlf Address: #2 \crlf Email: #3\crlf\thinrule\blank[small]}
\starttext
\myMacroTwo{Hans}{hans@hagen.context.nl}
\myMacroThree{Wolfgang}{Paradise of TeX, 2010}{wolfgang@schuster.context.de}
\stoptext
I think that (or rather I am certain…) in ConTeXt it is possible to define a unique macro called \myMacro which automatically tests the number of arguments: if there are only two of them the commands in \myMacroTwo are executed, while if three arguments are present, the commands in \myMacroThree are executed.
Can anyone give a hint on this matter?
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* Re: Macro with variable number of arguments
2010-02-28 8:54 Macro with variable number of arguments Otared Kavian
@ 2010-02-28 9:17 ` Wolfgang Schuster
2010-02-28 11:44 ` Otared Kavian
0 siblings, 1 reply; 4+ messages in thread
From: Wolfgang Schuster @ 2010-02-28 9:17 UTC (permalink / raw)
To: mailing list for ConTeXt users
Am 28.02.10 09:54, schrieb Otared Kavian:
> Hi all,
>
> I would like to write a macro which may have sometimes two, sometimes three arguments. The first and the last one are always present, but not necessarily the middle one. The unsatisfactory solution I have now is something like the example below:
>
> \define[2]\myMacroTwo{Name: #1\crlf Email: #2\crlf\thinrule\blank[small]}
> \define[3]\myMacroThree{Name: #1\crlf Address: #2 \crlf Email: #3\crlf\thinrule\blank[small]}
>
> \starttext
> \myMacroTwo{Hans}{hans@hagen.context.nl}
> \myMacroThree{Wolfgang}{Paradise of TeX, 2010}{wolfgang@schuster.context.de}
> \stoptext
>
> I think that (or rather I am certain…) in ConTeXt it is possible to define a unique macro called \myMacro which automatically tests the number of arguments: if there are only two of them the commands in \myMacroTwo are executed, while if three arguments are present, the commands in \myMacroThree are executed.
>
> Can anyone give a hint on this matter?
>
\def\myMacro
{\dotriplegroupempty\domyMacro}
\def\domyMacro#1#2#3%
{\doifelsenothing{#3}
{Name: #1\crlf Email: #2\crlf}
{Name: #1\crlf Address: #2 \crlf Email: #3\crlf}%
\thinrule\blank[small]}
Wolfgang
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* Re: Macro with variable number of arguments
2010-02-28 9:17 ` Wolfgang Schuster
@ 2010-02-28 11:44 ` Otared Kavian
2010-02-28 11:48 ` Hans Hagen
0 siblings, 1 reply; 4+ messages in thread
From: Otared Kavian @ 2010-02-28 11:44 UTC (permalink / raw)
To: mailing list for ConTeXt users
On 28 févr. 2010, at 10:17, Wolfgang Schuster wrote:
> \def\myMacro
> {\dotriplegroupempty\domyMacro}
>
> \def\domyMacro#1#2#3%
> {\doifelsenothing{#3}
> {Name: #1\crlf Email: #2\crlf}
> {Name: #1\crlf Address: #2 \crlf Email: #3\crlf}%
> \thinrule\blank[small]}
>
> Wolfgang
Many thanks Wolfgang! Your solution solves my question.
Now for a complete understanding of the solution (and before putting your solution on the wiki), here is another question.
After reading your solution, I searched in the source files and saw that in the file
syst-gen.mkii
the command \dosinglegroupempty, until \doquintuplegroupempty are defined.
For instance
\def\dotriplegroupempty#1%
{\def\dodogetargument##1%
{\def\dodogetargument####1%
{\def\dodogetargument%
{\dontpermitspacesbetweengroups
#1{##1}{####1}}%
\dogetgroupargument\thirdargumenttrue\thirdargumentfalse}%
\dogetgroupargument\secondargumenttrue\secondargumentfalse}%
\dogetgroupargument\firstargumenttrue\firstargumentfalse}
Can one use other constructions like these, for example can one define
\dosepttuplegroupempty
in order to have macros with 7 arguments, of which 5 are always present, while the sixth and seventh may be absent in some occasions?
Thanks again: OK
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* Re: Macro with variable number of arguments
2010-02-28 11:44 ` Otared Kavian
@ 2010-02-28 11:48 ` Hans Hagen
0 siblings, 0 replies; 4+ messages in thread
From: Hans Hagen @ 2010-02-28 11:48 UTC (permalink / raw)
To: mailing list for ConTeXt users; +Cc: Otared Kavian
On 28-2-2010 12:44, Otared Kavian wrote:
>
> On 28 févr. 2010, at 10:17, Wolfgang Schuster wrote:
>
>> \def\myMacro
>> {\dotriplegroupempty\domyMacro}
>>
>> \def\domyMacro#1#2#3%
>> {\doifelsenothing{#3}
>> {Name: #1\crlf Email: #2\crlf}
>> {Name: #1\crlf Address: #2 \crlf Email: #3\crlf}%
>> \thinrule\blank[small]}
>>
>> Wolfgang
>
> Many thanks Wolfgang! Your solution solves my question.
>
> Now for a complete understanding of the solution (and before putting your solution on the wiki), here is another question.
> After reading your solution, I searched in the source files and saw that in the file
> syst-gen.mkii
> the command \dosinglegroupempty, until \doquintuplegroupempty are defined.
> For instance
> \def\dotriplegroupempty#1%
> {\def\dodogetargument##1%
> {\def\dodogetargument####1%
> {\def\dodogetargument%
> {\dontpermitspacesbetweengroups
> #1{##1}{####1}}%
> \dogetgroupargument\thirdargumenttrue\thirdargumentfalse}%
> \dogetgroupargument\secondargumenttrue\secondargumentfalse}%
> \dogetgroupargument\firstargumenttrue\firstargumentfalse}
>
> Can one use other constructions like these, for example can one define
> \dosepttuplegroupempty
> in order to have macros with 7 arguments, of which 5 are always present, while the sixth and seventh may be absent in some occasions?
sure, you can just test .. \ifsecondargument ... \iffirstargument
but in such cases using key/values might make mode sense
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___________________________________________________________________________________
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2010-02-28 8:54 Macro with variable number of arguments Otared Kavian
2010-02-28 9:17 ` Wolfgang Schuster
2010-02-28 11:44 ` Otared Kavian
2010-02-28 11:48 ` Hans Hagen
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