process list items differently depending on position in list

process list items differently depending on position in list

[Denis Maier via ntg-context]

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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
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


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Re: process list items differently depending on position in list

[Denis Maier via ntg-context]

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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
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


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___________________________________________________________________________________

Re: process list items differently depending on position in list

[Hans Hagen via ntg-context]

On 5/2/2022 12:09 PM, Denis Maier via ntg-context wrote:

> But, it’d still love to hear whether there is a solution on the tex side.
\processtokens {[before]} {[between]} {[after]} {[space]} 
{{one}{two}{three}}

\def\whatever{a,b,c,d}

\getcommacommandsize[\whatever]
\scratchcounterone \zerocount
\scratchcountertwo \commalistsize

\processcommacommand[\whatever]
   {\advance\scratchcounterone\plusone
    \ifnum\scratchcounterone=\scratchcountertwo
      \space and\space
    \orelse\ifnum\scratchcounterone>\plusone
      ,\space
    \fi
    \commalistelement}

but ... there's also:

\startlines
\commalistsentence[aap,noot,mies]
\commalistsentence[aap,noot]
\commalistsentence[aap]
\commalistsentence[a,b,c]
\commalistsentence[a,b,c][{ \& },{ and }]
\commalistsentence[a,b,c][+,-]
\stoplines

which uses presets like

\setuplabeltext [nl] [and-1={{, }}, and-2={{ en }}]   % 1, 2 en 3
\setuplabeltext [en] [and-1={{, }}, and-2={{, }}]     % 1, 2, 3
\setuplabeltext [de] [and-1={{, }}, and-2={{ und }}]  % 1, 2 und 3
\setuplabeltext [hr] [and-1={{, }}, and-2={{ i }}]    % 1, 2 i 3

maybe wikify


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Re: process list items differently depending on position in list

[Denis Maier via ntg-context]

> -----Ursprüngliche Nachricht-----
> Von: ntg-context <ntg-context-bounces@ntg.nl> Im Auftrag von Hans Hagen
> via ntg-context
> Gesendet: Montag, 2. Mai 2022 12:34
> An: Denis Maier via ntg-context <ntg-context@ntg.nl>
> Cc: Hans Hagen <j.hagen@xs4all.nl>
> Betreff: Re: [NTG-context] process list items differently depending on
> position in list
> 
> On 5/2/2022 12:09 PM, Denis Maier via ntg-context wrote:
> 
> > But, it’d still love to hear whether there is a solution on the tex side.
> \processtokens {[before]} {[between]} {[after]} {[space]} {{one}{two}{three}}
> 
> \def\whatever{a,b,c,d}
> 
> \getcommacommandsize[\whatever]
> \scratchcounterone \zerocount
> \scratchcountertwo \commalistsize
> 
> \processcommacommand[\whatever]
>    {\advance\scratchcounterone\plusone
>     \ifnum\scratchcounterone=\scratchcountertwo
>       \space and\space
>     \orelse\ifnum\scratchcounterone>\plusone
>       ,\space
>     \fi
>     \commalistelement}

Thanks.

> 
> but ... there's also:
> 
> \startlines
> \commalistsentence[aap,noot,mies]
> \commalistsentence[aap,noot]
> \commalistsentence[aap]
> \commalistsentence[a,b,c]
> \commalistsentence[a,b,c][{ \& },{ and }] \commalistsentence[a,b,c][+,-]
> \stoplines
> 
> which uses presets like
> 
> \setuplabeltext [nl] [and-1={{, }}, and-2={{ en }}]   % 1, 2 en 3
> \setuplabeltext [en] [and-1={{, }}, and-2={{, }}]     % 1, 2, 3
> \setuplabeltext [de] [and-1={{, }}, and-2={{ und }}]  % 1, 2 und 3
> \setuplabeltext [hr] [and-1={{, }}, and-2={{ i }}]    % 1, 2 i 3
> 
> maybe wikify

I've just checked, \commalistsentence is already on the wiki, but you have to know it exists. (I'll check whether I can link to that page from somewhere.)

But there's no (high-level) way to apply certain commands to this list elements, right? 
Background: My real use case is a bit more complex. I use comma separated lists to store author lists, but the authors themselves are saved in structured variables. So, I'll need to reassemble the different name parts first.
So, nothing like 
\commalistprocessandmakesentence[a,b,c]\commandforfirst\commandforinbetween\commandforlast
Probably to specific, right?

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\startbuffer[test]
<?xml version='1.0' standalone='yes?>
<document>
<title>This is the title</title>
<author>
<family-name>Doe</family-name>
<given-name>John</given-name>
</author>
<author>
<family-name>Smith</family-name>
<given-name>Jane</given-name>
</author>
<p>This is a first sentence</p>
</document>
\stopbuffer

\startxmlsetups xml:setup
  \xmlsetsetup{\xmldocument}{*}{-}
  \xmlsetsetup{\xmldocument}{document|p}{xml:*}
\stopxmlsetups

\xmlregistersetup{xml:setup}

\startxmlsetups xml:document
  \xmlfilter{#1}{/title/command(xml:title)}
  \xmlfilter{#1}{/author/command(xml:author)}
  \startdocument
  \xmlflush{#1}
  \stopdocument
\stopxmlsetups

\startxmlsetups xml:title
  \setupdocument[title={\xmlflush{#1}},author={\AuthorList}]
\stopxmlsetups

\startxmlsetups xml:author:family-name
	\xmlflush{#1}
\stopxmlsetups

\startxmlsetups xml:author:given-name
	\xmlflush{#1}
\stopxmlsetups

\startxmlsetups xml:author
  \defineauthor[\xmlfilter{#1}{/family-name/command(xml:author:family-name)}\xmlfilter{#1}{/given-name/command(xml:author:given-name)}][family-name={\xmlfilter{#1}{/family-name/command(xml:author:family-name)}},given-name={\xmlfilter{#1}{/given-name/command(xml:author:given-name)}}]
  \addtocommalist {\xmlfilter{#1}{/family-name/command(xml:author:family-name)}\xmlfilter{#1}{/given-name/command(xml:author:given-name)}} \AuthorList
\stopxmlsetups

\startxmlsetups xml:p
  \xmlflush{#1}\par
\stopxmlsetups

\definenamespace
   [documentauthor] % name of internal varialbles
   [type=module,
    name=author, 
    command=yes, % Create \defineauthor
    style=yes, % Create \useauthorstyleandcolor 
    setup=list, % Create \setupauthor
    parent=documentauthor,
  ]
  
\def\AuthorList{}

\define[1]\useauthor
    {\edef\currentauthor{#1}%
    {\authorparameter{given-name}
         \space
          \authorparameter{family-name}}}

\startsetups document:start
    \documentvariable{title}\endgraf
    \blank[medium]
    \processcommacommand[\documentvariable{author}]\useauthor
    \endgraf
\stopsetups

\xmlprocessbuffer{main}{test}{}




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