Check the character after a macro

Check the character after a macro

[Sam Ḥilluc]

Hello,

Is it possible to check (in a macro definition) if the character following the
macro is included in a set of characters?

Something that could work like this:

    \def\MyMacro#1{%
        \ifNextCharIn{abcd} \dothis%
        \else \dothat%
        \fi%
    }

Cheers.
___________________________________________________________________________________
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://tex.aanhet.net
archive  : http://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: Check the character after a macro

[Otared Kavian]

Hi,

You have several commands in ConTeXt doing what you are seeking to do: please look at the examples below:

%%% begin do-if-inset.tex
\starttext
\type{\doifinset{A}{A,B,C}{should go}:} \doifinset{A}{A,B,C}{should go}

\type{\doifinset{D}{A,B,C}{should go}:}  \doifinset{D}{A,B,C}{should participate}


\type{\doifnotinset{}{A,B,C}{not in the set}:} \doifnotinset{}{A,B,C}{not in the set}

\type{\doifnotinset{D}{A,B,C}{not in the set}:} \doifnotinset{D}{A,B,C}{not in the set}

\doifinsetelse{D}{A,B,C}{it is in the set}{it is not in the set}

\define\test{B}

\type{\doifinsetelse{\test}{A,B,C}{\test\ is in the set}{\test\ is not in the set}}

\doifinsetelse{\test}{A,B,C}{\test\ is in the set}{\test\ is not in the set}
\stoptext
%%% end do-if-inset.tex

Best regards: OK

> On 01 May 2015, at 18:56, Sam Ḥilluc <shilluc@gmx.com> wrote:
> 
> Hello,
> 
> Is it possible to check (in a macro definition) if the character following the
> macro is included in a set of characters?
> 
> Something that could work like this:
> 
>    \def\MyMacro#1{%
>        \ifNextCharIn{abcd} \dothis%
>        \else \dothat%
>        \fi%
>    }
> 
> Cheers.
> ___________________________________________________________________________________
> 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://tex.aanhet.net
> archive  : http://foundry.supelec.fr/projects/contextrev/
> 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://tex.aanhet.net
archive  : http://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: Check the character after a macro

[Sam Ḥilluc]

On 2015-05-01 19:38, Otared Kavian wrote:
> Hi,
> 
> You have several commands in ConTeXt doing what you are seeking to do: please look at the examples below:
> 
> %%% begin do-if-inset.tex
> \starttext
> \type{\doifinset{A}{A,B,C}{should go}:} \doifinset{A}{A,B,C}{should go}
> 
> \type{\doifinset{D}{A,B,C}{should go}:}  \doifinset{D}{A,B,C}{should participate}
> 
> 
> \type{\doifnotinset{}{A,B,C}{not in the set}:} \doifnotinset{}{A,B,C}{not in the set}
> 
> \type{\doifnotinset{D}{A,B,C}{not in the set}:} \doifnotinset{D}{A,B,C}{not in the set}
> 
> \doifinsetelse{D}{A,B,C}{it is in the set}{it is not in the set}
> 
> \define\test{B}
> 
> \type{\doifinsetelse{\test}{A,B,C}{\test\ is in the set}{\test\ is not in the set}}
> 
> \doifinsetelse{\test}{A,B,C}{\test\ is in the set}{\test\ is not in the set}
> \stoptext
> %%% end do-if-inset.tex
> 
> Best regards: OK

This works for testing if a given character is in a set, but how can I retrieve
that character just after the defined macro.

To give an example, a macro that adds a dot if the next character is not a
comma.

    \MyMacro{text1} text2     ->      text1. text2
    \MyMacro{text1}, text2    ->      text1, text2

Thanks.
___________________________________________________________________________________
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://tex.aanhet.net
archive  : http://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: Check the character after a macro

[Wolfgang Schuster]

[-- Attachment #1.1: Type: text/plain, Size: 1837 bytes --]


> Am 01.05.2015 um 20:41 schrieb Sam Ḥilluc <shilluc@gmx.com>:
> 
> On 2015-05-01 19:38, Otared Kavian wrote:
>> Hi,
>> 
>> You have several commands in ConTeXt doing what you are seeking to do: please look at the examples below:
>> 
>> %%% begin do-if-inset.tex
>> \starttext
>> \type{\doifinset{A}{A,B,C}{should go}:} \doifinset{A}{A,B,C}{should go}
>> 
>> \type{\doifinset{D}{A,B,C}{should go}:}  \doifinset{D}{A,B,C}{should participate}
>> 
>> 
>> \type{\doifnotinset{}{A,B,C}{not in the set}:} \doifnotinset{}{A,B,C}{not in the set}
>> 
>> \type{\doifnotinset{D}{A,B,C}{not in the set}:} \doifnotinset{D}{A,B,C}{not in the set}
>> 
>> \doifinsetelse{D}{A,B,C}{it is in the set}{it is not in the set}
>> 
>> \define\test{B}
>> 
>> \type{\doifinsetelse{\test}{A,B,C}{\test\ is in the set}{\test\ is not in the set}}
>> 
>> \doifinsetelse{\test}{A,B,C}{\test\ is in the set}{\test\ is not in the set}
>> \stoptext
>> %%% end do-if-inset.tex
>> 
>> Best regards: OK
> 
> This works for testing if a given character is in a set, but how can I retrieve
> that character just after the defined macro.
> 
> To give an example, a macro that adds a dot if the next character is not a
> comma.
> 
>    \MyMacro{text1} text2     ->      text1. text2
>    \MyMacro{text1}, text2    ->      text1, text2


You can use the \doifelsenextchar command to check the character after your command.

\define[1]\MyMacro
  {\doifelsenextchar{,}
     {#1}
     {#1. }}

\starttext

\MyMacro{left} right

\MyMacro{left}, right

\stoptext


The limitation of this method is that you check only for one character at a time
and when want to check for more you have to use multiple \doifelsenextchar lines.

\doifelsenextchar{,}
  {...}
  {\doifelsenextchar{.}
     {...}
     {...}}

Wolfgang

[-- Attachment #1.2: Type: text/html, Size: 9625 bytes --]

[-- Attachment #2: Type: text/plain, Size: 485 bytes --]

___________________________________________________________________________________
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://tex.aanhet.net
archive  : http://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: Check the character after a macro

[Sam Ḥilluc]

On 2015-05-01 21:10, Wolfgang Schuster wrote:
> You can use the \doifelsenextchar command to check the character after your command.
> 
> \define[1]\MyMacro
>   {\doifelsenextchar{,}
>      {#1}
>      {#1. }}
> 
> \starttext
> 
> \MyMacro{left} right
> 
> \MyMacro{left}, right
> 
> \stoptext
> 
> 
> The limitation of this method is that you check only for one character at a time
> and when want to check for more you have to use multiple \doifelsenextchar lines.
> 
> \doifelsenextchar{,}
>   {...}
>   {\doifelsenextchar{.}
>      {...}
>      {...}}
> 
> Wolfgang

It worked, thanks.
___________________________________________________________________________________
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://tex.aanhet.net
archive  : http://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________