inside halign

inside halign

[Hans van der Meer]

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This works:
\def\dodotablexrule[#1][#2]{\noalign{\color[#2]{\hrule height#1 depth 
\z@}}}

But doing inside halign (tables) things like:
\def\tablexrule{\dodoubleargument\dotablexrule}
\def\dotablexrule[#1][#2]{%
	\doifemptyelse{#2}%
		{\dodotablexrule[#1][\@@tbxframecolor]}%
		{\dodotablexrule[#1][#2]}%
	}
\def\dodotablexrule[#1][#2]{\noalign{\color[#2]{\hrule height#1 depth 
\z@}}}

I get the error:
	! Misplaced \noalign.
\dodotablexrule [#1][#2]->\noalign
                                    {\color [#2]{\hrule height#1 depth 
\z@ }}

I get the impression that none if these argument related stuff works  
inside the halign template.
Is there a remedy? Or do I just have to give up hope using a unified  
macro and will have to resort  to separate macro's for default/chosen  
parameters?

Hans van der Meer




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Re: inside halign

[Taco Hoekwater]

Hans van der Meer wrote:
> I get the impression that none if these argument related stuff works 
> inside the halign template.

Correct. TeX is in a very special state when it is looking for a
potential \noalign, and the argument parsing required for optional
arguments destroys that special state,

Greetings, Taco

Re: inside halign

[Hans van der Meer]

Thanks. Spares me a lot of puzzling.
In some places things with dodoubleargument etc seem to work, so here  
and there a workaround is possible.

On Jun 26, 2006, at 10:37, Taco Hoekwater wrote:

>
>
> Hans van der Meer wrote:
>> I get the impression that none if these argument related stuff works
>> inside the halign template.
>
> Correct. TeX is in a very special state when it is looking for a
> potential \noalign, and the argument parsing required for optional
> arguments destroys that special state,
>
> Greetings, Taco

Hans van der Meer