From: Aditya Mahajan <adityam@umich.edu>
Subject: Re: Append to a commalist
Date: Thu, 12 Oct 2006 11:31:39 -0400 (EDT) [thread overview]
Message-ID: <Pine.WNT.4.63.0610121127290.2356@nqvgln> (raw)
In-Reply-To: <452E47D4.3080002@wxs.nl>
On Thu, 12 Oct 2006, Hans Hagen wrote:
> Fredrik Sjunnesson wrote:
>> Hello,
>>
>> Is there a smart way to create a commalist?
>>
>> I want to get the equivalent of
>>
>> \setparameter[namespace][listname={item1,item2,item3}]
>>
>> but be able to append one item at the time, like
>>
>> \append{namepace}{listname}{item1}
>> \append{namepace}{listname}{item2}
>> \append{namepace}{listname}{item3}
>>
>> I have tired this:
>>
>> \def\append#1#2#3{
>> \fullexpandoneargafter\doifemptyelse{\getvariable{#1}{#2}}
>> {\edef\tmp{#3}}
>> {\edef\tmp{\getvariable{#1}{#2},#3}}
>> \setvariables[#1][#2={\tmp}]}
>>
>> but it only works for one list. Apparently \tmp is not expanded so when
>> an item is appended to one list all other lists are affected. I have
>> tried \expanded but got the message stack full.
>>
>> Any help would be greatly appreciated.
>>
>>
> \def\appendtovaluelist#1#2%
> {\ifcsname#1\endcsname
> \expandafter\ifx\csname#1\endcsname\empty
> \expandafter\def\csname#1\endcsname{#2}%
> \else
> \expandafter\def\csname#1\expandafter
> \expandafter\expandafter\endcsname
> \expandafter\expandafter\expandafter{\csname#1\endcsname,#2}%
> \fi
> \else
> \expandafter\def\csname#1\endcsname{#2}%
> \fi}
>
> % saves an argument:
>
> \def\appendtovaluelist#1%
> {\ifcsname#1\endcsname
> \expandafter\ifx\csname#1\endcsname\empty
> \expandafter\noappendtovaluelist
> \csname#1\expandafter\expandafter\expandafter\endcsname
> \else
> \expandafter\doappendtovaluelist
> \csname#1\expandafter\expandafter\expandafter\endcsname
> \fi
> \else
> \expandafter\noappendtovaluelist\csname#1\expandafter\endcsname
> \fi}
>
> \def\doappendtovaluelist#1#2{\expandafter\def\expandafter#1\expandafter{#1,#2}}
> \def\noappendtovaluelist#1#2{\def#1{#2}}
>
> \appendtovaluelist{mylist}{aap}
> \appendtovaluelist{mylist}{noot}
> \appendtovaluelist{mylist}{mies}
>
> \showvalue{mylist}
What is the difference between a commalist and a valuelist :-)
\def\secondlist{}
\appendtocommalist{aap} {\secondlist}
\appendtocommalist{noot} {\secondlist}
\appendtocommalist{mies} {\secondlist}
\showvalue{secondlist}
Aditya
next prev parent reply other threads:[~2006-10-12 15:31 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-10-12 11:38 Fredrik Sjunnesson
2006-10-12 13:49 ` Hans Hagen
2006-10-12 15:31 ` Aditya Mahajan [this message]
2006-10-12 17:15 ` Hans Hagen
2006-10-12 21:15 Fredrik Sjunnesson
2006-10-12 22:03 ` Hans Hagen
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