doifnextcharelse

doifnextcharelse

[dr. Hans van der Meer]

I would like to differentiate on the following character being one of  X or not X.
But cannot get it right in \doifnextcharelse.

For example 
\def\mynextchar{\doifnextcharelse{X}{\def\Next{Y}}{\def\Next{Z}}\Next} delivers: ZX ZQ
then input: \mynextchar X \mynextchar Q
I hoped for YX ZQ, but it looks as if X tested false against X.

How to?

Hans van der Meer

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Re: doifnextcharelse

[Pablo Rodriguez]

On 01/24/2016 02:30 PM, dr. Hans van der Meer wrote:
> I would like to differentiate on the following character being one of  X or not X.
> But cannot get it right in \doifnextcharelse.
> 
> For example 
> \def\mynextchar{\doifnextcharelse{X}{\def\Next{Y}}{\def\Next{Z}}\Next} delivers: ZX ZQ
> then input: \mynextchar X \mynextchar Q
> I hoped for YX ZQ, but it looks as if X tested false against X.
> 
> How to?

Hans,

the basic \def\mynextchar{\doifnextcharelse{x}{y}{z}} works.

With your sample:

    \def\mynextchar{
        \doifnextcharelse{X}
        {\def\Next{Y}\Next}
        {\def\Next{Z}\Next}}

I hope it helps,


Pablo
-- 
http://www.ousia.tk
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Re: doifnextcharelse

[Meer, Hans van der]

Yes this works. But alas, the ultimate goal is to test against several characters and that seems impossible to do with standard ConTeXt api-macros.Let alone when these characters are . or . or ) etc.

Hans van der Meer

met vriendelijke groet
Hans van der Meer




> On 24 Jan 2016, at 15:13, Pablo Rodriguez <oinos@gmx.es> wrote:
> 
> On 01/24/2016 02:30 PM, dr. Hans van der Meer wrote:
>> I would like to differentiate on the following character being one of  X or not X.
>> But cannot get it right in \doifnextcharelse.
>> 
>> For example 
>> \def\mynextchar{\doifnextcharelse{X}{\def\Next{Y}}{\def\Next{Z}}\Next} delivers: ZX ZQ
>> then input: \mynextchar X \mynextchar Q
>> I hoped for YX ZQ, but it looks as if X tested false against X.
>> 
>> How to?
> 
> Hans,
> 
> the basic \def\mynextchar{\doifnextcharelse{x}{y}{z}} works.
> 
> With your sample:
> 
>    \def\mynextchar{
>        \doifnextcharelse{X}
>        {\def\Next{Y}\Next}
>        {\def\Next{Z}\Next}}
> 
> I hope it helps,
> 
> 
> Pablo
> -- 
> http://www.ousia.tk


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Re: doifnextcharelse

[Meer, Hans van der]

Is it impossible to test on a blank with something alike  \doifnextcharelse ?

The implementation in the source skips blanks, but what if that is one doesn't want? For example to distinguish between "\abc \def" and \abc\def"?

Hans van der Meer



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Re: doifnextcharelse

[Wolfgang Schuster]

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> Meer, Hans van der <mailto:H.vanderMeer@uva.nl>
> 24. Januar 2016 um 15:58
> Yes this works. But alas, the ultimate goal is to test against several 
> characters and that seems impossible to do with standard ConTeXt 
> api-macros.Let alone when these characters are . or . or ) etc.
\startluacode

function checknextstring(str)
     if str == "a" then
         context("A")
     elseif str == "b" then
         context("B")
     else
         context("??")
     end
end

interfaces.implement { name = "readnextstring", actions = 
checknextstring,   arguments = "string" }

\stopluacode

\unprotect
\let\readnextstring\clf_readnextstring
\protect

\starttext

\readnextstring c
\readnextstring b
\readnextstring a
\readnextstring {xx}

\stoptext

Wolfgang

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