[NTG-context] \doifemptyelse issue?

[NTG-context] \doifemptyelse issue?

[Bruce Horrocks]

The following MWE gives "false false" instead of "false true". I'm sure this used to work (18 months or more ago!) as I found it when re-processing an old document.

---start---
\setdataset [DS] [a=aaaa]
\setdataset [DS] [a=]

\starttext

:\datasetvariable{DS}{1}{a}: \crlf
:\datasetvariable{DS}{2}{a}: \crlf

\doifemptyelse{\datasetvariable{DS}{1}{a}}{true}{false}

\doifemptyelse{\datasetvariable{DS}{2}{a}}{true}{false}
  
\stoptext
---end---

ConTeXt  ver: 2023.09.26 18:19 LMTX

There is a work-around using \doiftext instead as that seems to work okay with recalled dataset values but I thought I'd raise it.

—
Bruce Horrocks
Hampshire, UK

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[NTG-context] Re: \doifemptyelse issue?

[Pablo Rodriguez via ntg-context]

On 11/13/23 13:10, Bruce Horrocks wrote:
> The following MWE gives "false false" instead of "false true". I'm
> sure this used to work (18 months or more ago!) as I found it when
> re-processing an old document.> [...]
> There is a work-around using \doiftext instead as that seems to work
> okay with recalled dataset values but I thought I'd raise it.
Hi Bruce,

some time ago Wolfgang explained
(https://mailman.ntg.nl/archives/list/ntg-context@ntg.nl/message/7OO5P34S56RGR5G3K7LXS6DTZWAJGUDZ/):

> \doifempty(else) doesn't expand the argument and any argument counts as
> not empty. To satisfy the command you can expand the first argument
> (\normalexpanded) or you use \doifnothing(else) which expands the argument.

I don’t know whether is what is preveiting your test here, but
\doifnothingelse seems to work fine with your sample.

Just in case it might help,

Pablo
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[NTG-context] Re: \doifemptyelse issue?

[Hans Hagen]

On 11/13/2023 1:10 PM, Bruce Horrocks wrote:
> The following MWE gives "false false" instead of "false true". I'm sure this used to work (18 months or more ago!) as I found it when re-processing an old document.

because it's not empty (it's a command that you pass)

> ---start---
> \setdataset [DS] [a=aaaa]
> \setdataset [DS] [a=]
> 
> \starttext
> 
> :\datasetvariable{DS}{1}{a}: \crlf
> :\datasetvariable{DS}{2}{a}: \crlf
> 
> \doifemptyelse{\datasetvariable{DS}{1}{a}}{true}{false}
> 
> \doifemptyelse{\datasetvariable{DS}{2}{a}}{true}{false}
>    
> \stoptext
> ---end---
> 
> ConTeXt  ver: 2023.09.26 18:19 LMTX
> 
> There is a work-around using \doiftext instead as that seems to work okay with recalled dataset values but I thought I'd raise it.
for that we have:

\doifsomethingelse

Hans

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[NTG-context] Re: \doifemptyelse issue?

[Bruce Horrocks]

> On 14 Nov 2023, at 10:40, Hans Hagen <j.hagen@xs4all.nl> wrote:
> 
> On 11/13/2023 1:10 PM, Bruce Horrocks wrote:
>> The following MWE gives "false false" instead of "false true". I'm sure this used to work (18 months or more ago!) as I found it when re-processing an old document.
> 
> because it's not empty (it's a command that you pass)
> 
>> ---start---
>> \setdataset [DS] [a=aaaa]
>> \setdataset [DS] [a=]
>> \starttext
>> :\datasetvariable{DS}{1}{a}: \crlf
>> :\datasetvariable{DS}{2}{a}: \crlf
>> \doifemptyelse{\datasetvariable{DS}{1}{a}}{true}{false}
>> \doifemptyelse{\datasetvariable{DS}{2}{a}}{true}{false}
>>   \stoptext
>> ---end---
>> ConTeXt  ver: 2023.09.26 18:19 LMTX
>> There is a work-around using \doiftext instead as that seems to work okay with recalled dataset values but I thought I'd raise it.
> for that we have:
> 
> \doifsomethingelse
> 

Thank-you for this. I've realised now that this isn't actually my problem (and that why it worked in the past was probably becuase that part of the 'if' was never taken!).

I'll start another thread.

—
Bruce Horrocks
Hampshire, UK

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