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["Sam Liddicott" <address@hidden>]

On 15/03/11 10:34, Sam Liddicott wrote:
> Wahey - the macro examples using unquote* lead me to this:
>
> <quasi|<tree|J|<unquote*|<jags>>>>
>
> quite niftily shows the answer, which is:
>
> <quasi|<cline|<unquote*|<jags>>>>
>
> I hadn't realised that unquote* could work on non-arg!
>
> So now I know that quasi...unquote*
> is used to strip the label from a tree and return the sub-expressions


Nope, that doesn't quite work - it worked for me because jags was a 
plain macro with no <with or arguments.

quasi and unquote are stripping down the macro definition and not 
running on the macro results until cline is executed.

(I'm glad to notice that because I've been struggling for months to 
write a macro that overrides and existing macro but can still call the 
old definition without without wasting an "assign" variable).

So I need a way to have the <jags> evaluated before the quasi and 
unquote* take effect. I don't look forward to it. The easier way is 
internally to jags assign the result data to a global var and use that. 
ugly - but I guess the quote-value macro  helps:
<quasi|<tree|P|<unquote*|<quote-value|points>>>>

so I need something like: quota-macro-result that does what quote-value 
does to a value...

I'll keep working on it, but if anyone wants to give me the answer, 
please do...


> (what you can do while waiting for things to download)
>
> Sam
>
>
> On 15/03/11 08:49, Sam Liddicott wrote:
> > If I have a tuple whose members are to be the arguments of a macro, 
> > how do I express this?
> >
> > For instance, I have a tuple which is a list of points that I want to 
> > pass to cline
> >
> > I've tried:
> >
> > <assign|jags|<macro|<tuple|<point|5.26538|24.5758>|<point|14.155443841778|24.2794681836222>|<point|12.2927635930679|26.9041539886228>|<point|11.4460907527451|26.0574811483>|<point|10.1337478502447|27.2851567667681>|<point|9.20240772588967|26.3114830003969>|<point|7.0010583410504|28.174163249107>|<point|6.06971821669533|25.8458129382193>|<point|4.37637253604974|27.2004894827358>>>> 
> >
> >
> > <assign|jag|<macro|<merge|<tuple|<compound|cline>>|<jags>>>>
> >
> > <jag>
> >
> >
> > But it's not quite the right thing to draw the cline - after all it 
> > returns a tuple
> >
> > The nearest I have seen is map-args but of course it doesn't cross 
> > the args boundary. I'm trying various use of the eval family but I 
> > can't see how they could make success...
> >
> > Sam


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