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From: Jeff Squyres (jsquyres_at_[hidden])
Date: 2007-06-12 08:07:20


On Jun 11, 2007, at 6:02 PM, Ethan Mallove wrote:

> btls = &if("&regexp("&shell("hostname")", "v440-2|v20z-2")", \
> "&enumerate("self,sm,tcp")", \
> "&if("&regexp("&shell("hostname")", "v440-6")", \
> "&enumerate("udapl")", \
> "&enumerate("sm", "tcp", "sm,tcp", "udapl",
> "sm,udapl")"" \
> ) \
> )

Yowza! We really need to make this quoting situation better
somehow. :-(

Don't you have an extra ) in there at the end?

> How come EvaluateString() doesn't translate this:
>
> btls = &if("&regexp("&shell("hostname")", "v440-2|v20z-2")", \
> "&enumerate("self,sm,tcp")", \
> "&if("&regexp("&shell("hostname")", "v440-6")", \
> "&enumerate("udapl")", \
> "&enumerate("sm", "tcp", "sm,tcp", "udapl",
> "sm,udapl")"" \
> ) \
> )
>
> Into one big eval block like this:
>
> eval $btls = MTT::Functions::if(MTT::Functions::regexp
> (MTT::Functions::shell("hostname"), "v440-2|v20z-2"),
> MTT::Functions::enumerate("self,sm,tcp"),
> MTT::Functions::if("MTT::Functions::regexp
> ("MTT::Functions::shell("hostname"), "v440-6"),
> MTT::Functions::enumerate("udapl"),
> MTT::Functions::enumerate("sm", "tcp",
> "sm,tcp", "udapl", "sm,udapl")
> )
> )
>
> So we could put the burden of the nasty recursive
> parenthesis/quote parsing on perl, rather than MTT. That
> would seem to naturally make the INI funclet syntax more
> Perl-like.

Ah -- I had to think about this a bit before I figured it out/
remembered. I think we won't get the expansion effect if you do it
this way. Although it might solve some other issues (e.g., https://
svn.open-mpi.org/trac/mtt/ticket/184)...?

-- 
Jeff Squyres
Cisco Systems