From: Hans Hagen <pragma@wxs.nl>
Subject: Re: Append to a commalist
Date: Thu, 12 Oct 2006 19:15:12 +0200 [thread overview]
Message-ID: <452E7820.6040108@wxs.nl> (raw)
In-Reply-To: <Pine.WNT.4.63.0610121127290.2356@nqvgln>
Aditya Mahajan wrote:
> 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}
>
>
nothing, just the {name} thing -)
--
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Hans Hagen | PRAGMA ADE
Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com
| www.pragma-pod.nl
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next prev parent reply other threads:[~2006-10-12 17:15 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
2006-10-12 17:15 ` Hans Hagen [this message]
2006-10-12 21:15 Fredrik Sjunnesson
2006-10-12 22:03 ` Hans Hagen
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