The ". $" notation (was: Re: how useful are collecting lists?)
Alan Manuel Gloria
(18 Mar 2013 01:26 UTC)
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Re: The ". $" notation
Shiro Kawai
(18 Mar 2013 02:42 UTC)
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Re: The ". $" notation
Alan Manuel Gloria
(18 Mar 2013 02:44 UTC)
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Re: The ". $" notation
Shiro Kawai
(18 Mar 2013 04:45 UTC)
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Re: The ". $" notation
David A. Wheeler
(18 Mar 2013 16:25 UTC)
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Re: The ". $" notation
Alan Manuel Gloria
(19 Mar 2013 00:17 UTC)
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Re: The ". $" notation
David A. Wheeler
(19 Mar 2013 03:28 UTC)
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Re: The ". $" notation
Alan Manuel Gloria
(19 Mar 2013 05:52 UTC)
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Re: The ". $" notation
David A. Wheeler
(19 Mar 2013 10:44 UTC)
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Handling scomments after "."
David A. Wheeler
(19 Mar 2013 03:41 UTC)
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Re: Handling scomments after "."
David A. Wheeler
(19 Mar 2013 04:12 UTC)
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Re: The ". $" notation (was: Re: how useful are collecting lists?) David A. Wheeler (18 Mar 2013 03:09 UTC)
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Alan Manuel Gloria: > To reduce the parentheses, we could (I propose!!) do: > > cut . > proc arg arg <> arg arg <...> Ugh. I *really* don't see the value of this form, and allowing "." at the end disables some error checking I don't really want to disable. Seems to me that people would normally write: cut proc arg arg <> arg arg <...> I also suspect there may be implementation problems. > Or alternatively: > > cut . $ proc arg arg <> arg arg <...> I doubt I would *personally* use this, and I'm skeptical that it adds much. But on the other hand I don't see any harm, especially since we have to check after "." anyway for special cases, and that seems like an improbable construct to use *accidentally*. So I'd be okay with adding this. Again, I'd just write: cut proc arg arg <> arg arg <...> > Basically, in the case of cut, while ". $" is effectively a no-op, it > separates, syntactically, the procedure call from the form that > provides a limited extension of the procedure call's semantics (in the > case of cut, it adds <> and <...> syntaxes). A user might, in the > future, be able to think of other extended formulations which ". $" > could then support. > So my proposal is: > > 1. Allow "foo . EOL INDENT x ..." ==> "(foo . (x ...))" Worried about this one. > 2. Allow "foo . $ x ..." ==> "(foo x ...)" I could get talked into this one, though I can't imagine using it. > What does everyone think?? I'd sure like to know too! --- David A. Wheeler