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, W= olfgang 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 punctuati= on
>> if any other keys are defined before a specific one in an assignme= nt:
>>
>> ```
>> =C2=A0 =C2=A0 =C2=A0 % If any of the preceding keys was specified,= then replace any
>> preceding punctuation with a space
>> =C2=A0 =C2=A0 % and typeset the number with its CSL abbreviation, = followed by a
>> comma
>> =C2=A0 =C2=A0 =C2=A0 \ifdefined\btxsbllocvol
>> \removeunwantedspaces\removepunctuation\btxspace
>> \orelse\ifdefined\btxsbllocno
>> \removeunwantedspaces\removepunctuation\btxspace
>> =C2=A0 =C2=A0 =C2=A0 \fi
>> \orelse\ifdefined\btxsbllocpt
>> =C2=A0 =C2=A0 =C2=A0 [...]
>> =C2=A0 =C2=A0 =C2=A0 \fi
>> ```
>
> The \fi at the end of each \orelse branch is wrong.
>
> \ifdefined\btxsbllocvol
>=C2=A0 =C2=A0=C2=A0=C2=A0 ...
> \orelse\ifdefined\btxsbllocno
>=C2=A0 =C2=A0=C2=A0=C2=A0 ...
> \else
>=C2=A0 =C2=A0=C2=A0=C2=A0 ...
> \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
=C2=A0 =C2=A0 =C2=A0FOO
\orelse\ifcstok\XXX\ofo
=C2=A0 =C2=A0 =C2=A0OFO
\orelse\ifcstok\XXX\oof
=C2=A0 =C2=A0 =C2=A0OOF
\else
=C2=A0 =C2=A0 =C2=A0XXX
\fi

\def\XXX{\ofo}

\iftok{\XXX}{\foo}%
=C2=A0 =C2=A0 =C2=A0FOO
\orelse\iftok{\XXX}{\ofo}%
=C2=A0 =C2=A0 =C2=A0OFO
\orelse\iftok{\XXX}{\oof}%
=C2=A0 =C2=A0 =C2=A0OOF
\else
=C2=A0 =C2=A0 =C2=A0XXX
\fi

\ifcstok{\XXX}\foo
=C2=A0 =C2=A0 =C2=A0FOO
\orelse\ifcstok{\XXX}\ofo
=C2=A0 =C2=A0 =C2=A0OFO
\orelse\ifcstok\XXX}\oof
=C2=A0 =C2=A0 =C2=A0OOF
\else
=C2=A0 =C2=A0 =C2=A0XXX
\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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