Re: process list items differently depending on position in list

[Denis Maier via ntg-context <ntg-context@ntg.nl>]

[-- Attachment #1.1: Type: text/plain, Size: 1465 bytes --]

Ok, in lua it's indeed simple:

\startluacode
list = {"foo", "bar", "baz"}
\stopluacode

\starttext

\startluacode
for i, v in ipairs(list) do
    if i == #list then
        tex.print("last:")
        tex.print(v)
    elseif i == 1 then
        tex.print("first:")
        tex.print(v)
    else
        tex.print("in between:")
        tex.print(v)
    end
end
\stopluacode

\stoptext

But, it'd still love to hear whether there is a solution on the tex side.

Denis

Von: Maier, Denis Christian (UB)
Gesendet: Montag, 2. Mai 2022 09:15
An: 'mailing list for ConTeXt users' <ntg-context@ntg.nl>
Betreff: process list items differently depending on position in list

Hi,

I need to process a comma separated list, and adapt the formatting according to the position of an item in the list (example below). Expected output would be:
{\bf foo
}, {\em bar} and baz.

Is that possible? Can I somehow get the position of an item in the list? (My understanding is that \processcommalist and \processcommacommand apply a command to each list item, but there is no such thing as <position in the list>... I hope I'm wrong here.)

Or is that something where using Lua would be a better choice?

Best,
Denis

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\define[1]\command
  {#1}

\define\somelist
  {foo, bar, baz}

\starttext

  \processcommacommand
    [\somelist]
    \command

\stoptext
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


[-- Attachment #1.2: Type: text/html, Size: 6112 bytes --]

[-- Attachment #2: Type: text/plain, Size: 493 bytes --]

___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________