Re: xml processing: if elseif else / switch case

[Joey McCollum via ntg-context <ntg-context@ntg.nl>]

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Thanks for correcting that, Wolfgang. I must have added the other \fi
instances because I was trying to use \orelse in MKIV and couldn't get it
to work. Is it only supported in LMTX?

Joey

On Thu, Dec 9, 2021 at 11:30 AM Hans Hagen via ntg-context <
ntg-context@ntg.nl> wrote:

> On 12/9/2021 5:11 PM, Wolfgang Schuster via ntg-context wrote:
> > Joey McCollum via ntg-context schrieb am 09.12.2021 um 15:08:
> >> I believe \orelse might be what you want. It works with most \if...
> >> macros, and it avoids nesting of \doifelse constructs. Here's an
> >> example, which I use in conditionally removing preceding punctuation
> >> if any other keys are defined before a specific one in an assignment:
> >>
> >> ```
> >>       % If any of the preceding keys was specified, then replace any
> >> preceding punctuation with a space
> >>     % and typeset the number with its CSL abbreviation, followed by a
> >> comma
> >>       \ifdefined\btxsbllocvol
> >> \removeunwantedspaces\removepunctuation\btxspace
> >> \orelse\ifdefined\btxsbllocno
> >> \removeunwantedspaces\removepunctuation\btxspace
> >>       \fi
> >> \orelse\ifdefined\btxsbllocpt
> >>       [...]
> >>       \fi
> >> ```
> >
> > The \fi at the end of each \orelse branch is wrong.
> >
> > \ifdefined\btxsbllocvol
> >      ...
> > \orelse\ifdefined\btxsbllocno
> >      ...
> > \else
> >      ...
> > \fi
> and when 'string' comparison is needed one can do:
>
> \starttext
>
> \def\foo{foo}
> \def\ofo{ofo}
> \def\oof{oof}
>
> \def\XXX{ofo}
>
> \ifcstok\XXX\foo
>      FOO
> \orelse\ifcstok\XXX\ofo
>      OFO
> \orelse\ifcstok\XXX\oof
>      OOF
> \else
>      XXX
> \fi
>
> \def\XXX{\ofo}
>
> \iftok{\XXX}{\foo}%
>      FOO
> \orelse\iftok{\XXX}{\ofo}%
>      OFO
> \orelse\iftok{\XXX}{\oof}%
>      OOF
> \else
>      XXX
> \fi
>
> \ifcstok{\XXX}\foo
>      FOO
> \orelse\ifcstok{\XXX}\ofo
>      OFO
> \orelse\ifcstok\XXX}\oof
>      OOF
> \else
>      XXX
> \fi
>
> \stoptext
>
> watch the subtle differences. It all makes coding in tex primitives a
> bit more visual appealing and readable. Oone of the objectives of lmtx
> is that users can read the context code without pondering too much about
> the syntax or getting depressed by possibly obscure helper macros and
> expansion trickery.
>
> Hans
>
>
> -----------------------------------------------------------------
>                                            Hans Hagen | PRAGMA ADE
>                Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
>         tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
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