Check the character after a macro
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.
Hi, You have several commands in ConTeXt doing what you are seeking to do: please look at the examples below: %%% begin doifinset.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 doifinset.tex Best regards: OK
On 01 May 2015, at 18:56, Sam Ḥilluc
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 : ntgcontext@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntgcontext webpage : http://www.pragmaade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___________________________________________________________________________________
On 20150501 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 doifinset.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 doifinset.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.
Am 01.05.2015 um 20:41 schrieb Sam Ḥilluc
: On 20150501 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 doifinset.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 doifinset.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
On 20150501 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.
participants (3)

Otared Kavian

Sam Ḥilluc

Wolfgang Schuster