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From: Neil Jerram <neil@ossau.uklinux.net>
Cc: guile-devel@gnu.org
Subject: Re: New syntax: (: MODULE-NAME VARIABLE-NAME)
Date: 16 Nov 2003 18:38:24 +0000	[thread overview]
Message-ID: <m3r808w44f.fsf@laruns.ossau.uklinux.net> (raw)
In-Reply-To: <m3y8ugw4ye.fsf@laruns.ossau.uklinux.net>

>>>>> "Marius" == Marius Vollmer <mvo@zagadka.de> writes:
    Marius> Hmm, I would find it more natural to have a separate macro, like

    Marius> (:: MOD-NAME VAR-NAME)

    Marius> where '::' would be the (to me) obvious choice of name.
    Marius> Unfortunately, with (read-set! keyword 'prefix) that name would be a
    Marius> keyword...

Sorry that my thoughts on this are coming out in such a trickle!

I just noticed, though, that there are some other symbols (than :)
available that don't have other meanings and which could be understood
as relevant to a module lookup:

  (@ MOD-NAME VAR-NAME)
Seems quite good, with @ meaning `at' as in `in the specified module'.

  ($ MOD-NAME VAR-NAME)
Tenuous link to $'s use in many languages for variable reference.
Clashes with not-yet-widespread use of $ for value-history, though.

  (. MOD-NAME VAR-NAME)
Intuitively very similar to : IMO, but without the keyword issues.
However, (i) some people might want `.' for the mathematical dot
(scalar) product; (ii) Guile currently seems confused about whether
`.' is a symbol:

guile> .
ERROR: Unbound variable: .
ABORT: (unbound-variable)
guile> '.
.
guile> (define . 1)
ERROR: In procedure memoization:
ERROR: In line 3: Bad expression (define . 1).
ABORT: (syntax-error)

  (? MOD-NAME VAR-NAME)
Quite nice, ? meaning a query, so a lookup.

Of these, I like @ the most.

        Neil



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  reply	other threads:[~2003-11-16 18:38 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-11-13 18:12 New syntax: (: MODULE-NAME VARIABLE-NAME) Marius Vollmer
2003-11-13 19:47 ` Neil Jerram
2003-11-13 20:58   ` Marius Vollmer
2003-11-14 21:04     ` Neil Jerram
2003-11-15 15:19       ` Marius Vollmer
2003-11-15 19:22         ` Neil Jerram
2003-11-16 17:31           ` Marius Vollmer
2003-11-16 18:20             ` Neil Jerram
2003-11-16 18:38               ` Neil Jerram [this message]
2003-11-16 20:36                 ` Marius Vollmer
2003-11-17 20:18                   ` Neil Jerram
2003-11-17 21:34                     ` Marius Vollmer
2003-11-16 20:28               ` Marius Vollmer
2003-11-14 22:09 ` Mikael Djurfeldt
2003-11-15 15:10   ` Marius Vollmer
2003-11-17  2:00     ` Mikael Djurfeldt
2003-11-17 14:41       ` Marius Vollmer
2003-11-16  8:02 ` Dirk Herrmann
2003-11-17 14:44 ` New syntax (@ MODULE-NAME VARIABLE-NAME) committed Marius Vollmer

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