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
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