* Problem with macro with optional parameter
@ 2017-06-27 8:58 Jaroslav Hajtmar
2017-06-27 11:05 ` Henri Menke
0 siblings, 1 reply; 3+ messages in thread
From: Jaroslav Hajtmar @ 2017-06-27 8:58 UTC (permalink / raw)
To: mailing list for ConTeXt users
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Hello ConTeXist.
I'm not able to solve a macros problem with one optional argument. I need the macro to return a value that can be used as a dorecurse loop parameter.
Is there possibility create macro with optional parameter and parameter is concurrently inside in braces? (in nonsquare brackets)?
I've tried to experiment with examples from the wiki, but I'm not clear about it.
Thanx for help.
Jaroslav Hajtmar
Here is minimal example:
\def\DoCommand[#1]%
{\iffirstargument#1\else100\fi}
\def\Command%
{\dosingleargument\DoCommand}
%\def\DoAnotherCommand{#1}%
% {\iffirstargument#1\else100\fi}
%\def\AnotherCommand%
% {\dosingleargument\DoAnotherCommand}
\starttext
1. \Command[5] % OK
2. \Command % OK
%1. \dorecurse{\Command[5]}{\recurselevel\crlf} % not working
%2. \dorecurse{\Command}{\recurselevel\crlf} % not working
\stoptext
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___________________________________________________________________________________
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^ permalink raw reply [flat|nested] 3+ messages in thread* Re: Problem with macro with optional parameter
2017-06-27 8:58 Problem with macro with optional parameter Jaroslav Hajtmar
@ 2017-06-27 11:05 ` Henri Menke
2017-06-27 11:25 ` Jaroslav Hajtmar
0 siblings, 1 reply; 3+ messages in thread
From: Henri Menke @ 2017-06-27 11:05 UTC (permalink / raw)
To: ntg-context
On Tue, 2017-06-27 at 08:58 +0000, Jaroslav Hajtmar wrote:
> Hello ConTeXist.
> I'm not able to solve a macros problem with one optional argument. I need the macro to return a
> value that can be used as a dorecurse loop parameter.
> Is there possibility create macro with optional parameter and parameter is concurrently inside in
> braces? (in nonsquare brackets)?
> I've tried to experiment with examples from the wiki, but I'm not clear about it.
>
> Thanx for help.
> Jaroslav Hajtmar
>
> Here is minimal example:
>
> \def\DoCommand[#1]%
> {\iffirstargument#1\else100\fi}
>
> \def\Command%
> {\dosingleargument\DoCommand}
>
> %\def\DoAnotherCommand{#1}%
> % {\iffirstargument#1\else100\fi}
>
> %\def\AnotherCommand%
> % {\dosingleargument\DoAnotherCommand}
>
> \starttext
>
> 1. \Command[5] % OK
>
> 2. \Command % OK
>
>
>
>
> %1. \dorecurse{\Command[5]}{\recurselevel\crlf} % not working
>
> %2. \dorecurse{\Command}{\recurselevel\crlf} % not working
The first argument to \dorecurse has to expand to a number. Therefore it has to be fully-
expandable. Scanning for optional brackets is never expandable. You have to do it this way:
\def\Command#1%
{\expdoifelse{#1}{}{100}{#1}}
\starttext
1. \Command{5} % OK
2. \Command{} % OK
1. \dorecurse{\Command{5}}{\recurselevel\crlf} % not working
2. \dorecurse{\Command{}}{\recurselevel\crlf} % not working
\stoptext
> \stoptext
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to the Wiki!
>
> maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage : http://www.pragma-ade.nl / http://context.aanhet.net
> archive : https://bitbucket.org/phg/context-mirror/commits/
> wiki : http://contextgarden.net
> ___________________________________________________________________________________
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!
maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage : http://www.pragma-ade.nl / http://context.aanhet.net
archive : https://bitbucket.org/phg/context-mirror/commits/
wiki : http://contextgarden.net
___________________________________________________________________________________
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: Problem with macro with optional parameter
2017-06-27 11:05 ` Henri Menke
@ 2017-06-27 11:25 ` Jaroslav Hajtmar
0 siblings, 0 replies; 3+ messages in thread
From: Jaroslav Hajtmar @ 2017-06-27 11:25 UTC (permalink / raw)
To: mailing list for ConTeXt users
Thanx Henri for answer.
Maybe I have been explaining wrong my problem. I would need a variant without a parameter and concurrently without braces. Command without braces swallows the break of the paragraph.
\def\Command#1%
{\expdoifelse{#1}{}{100}{#1}}
\starttext
1. \Command{5} % OK
2. \Command % OK
3. As You see, Command without braces swallows the break of the paragraph.
1. \dorecurse{\Command{5}}{\recurselevel\crlf} % not working
2. \dorecurse{\Command{}}{\recurselevel\crlf} % not working
\stoptext
Jaroslav Hajtmar
Dne 27.06.17 13:05, ntg-context za uživatele Henri Menke <ntg-context-bounces@ntg.nl za uživatele henrimenke@gmail.com> napsal(a):
On Tue, 2017-06-27 at 08:58 +0000, Jaroslav Hajtmar wrote:
> Hello ConTeXist.
> I'm not able to solve a macros problem with one optional argument. I need the macro to return a
> value that can be used as a dorecurse loop parameter.
> Is there possibility create macro with optional parameter and parameter is concurrently inside in
> braces? (in nonsquare brackets)?
> I've tried to experiment with examples from the wiki, but I'm not clear about it.
>
> Thanx for help.
> Jaroslav Hajtmar
>
> Here is minimal example:
>
> \def\DoCommand[#1]%
> {\iffirstargument#1\else100\fi}
>
> \def\Command%
> {\dosingleargument\DoCommand}
>
> %\def\DoAnotherCommand{#1}%
> % {\iffirstargument#1\else100\fi}
>
> %\def\AnotherCommand%
> % {\dosingleargument\DoAnotherCommand}
>
> \starttext
>
> 1. \Command[5] % OK
>
> 2. \Command % OK
>
>
>
>
> %1. \dorecurse{\Command[5]}{\recurselevel\crlf} % not working
>
> %2. \dorecurse{\Command}{\recurselevel\crlf} % not working
The first argument to \dorecurse has to expand to a number. Therefore it has to be fully-
expandable. Scanning for optional brackets is never expandable. You have to do it this way:
\def\Command#1%
{\expdoifelse{#1}{}{100}{#1}}
\starttext
1. \Command{5} % OK
2. \Command{} % OK
1. \dorecurse{\Command{5}}{\recurselevel\crlf} % not working
2. \dorecurse{\Command{}}{\recurselevel\crlf} % not working
\stoptext
> \stoptext
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to the Wiki!
>
> maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage : http://www.pragma-ade.nl / http://context.aanhet.net
> archive : https://bitbucket.org/phg/context-mirror/commits/
> wiki : http://contextgarden.net
> ___________________________________________________________________________________
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!
maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage : http://www.pragma-ade.nl / http://context.aanhet.net
archive : https://bitbucket.org/phg/context-mirror/commits/
wiki : http://contextgarden.net
___________________________________________________________________________________
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!
maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage : http://www.pragma-ade.nl / http://context.aanhet.net
archive : https://bitbucket.org/phg/context-mirror/commits/
wiki : http://contextgarden.net
___________________________________________________________________________________
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2017-06-27 8:58 Problem with macro with optional parameter Jaroslav Hajtmar
2017-06-27 11:05 ` Henri Menke
2017-06-27 11:25 ` Jaroslav Hajtmar
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