From: Matt Wette <matt.wette@gmail.com>
To: Guile User <guile-user@gnu.org>
Subject: syntax taste: use of unquote in macros
Date: Sun, 29 Mar 2020 08:11:12 -0700 [thread overview]
Message-ID: <dd403a66-123b-2855-39cb-7b5c5f36cd9a@gmail.com> (raw)
Hi All,
I'm not sure if you know about this, but there is a discrepancy in the
way some folks define macros to use unquote (aka ,). For example,
> (use-modules (system base pmatch))
> (pmatch '(foo "bar") ((foo ,val) (write val) (newline)))
=> "bar"
> (use-modules (ice-9 match))
> (match '(foo "bar") (`(foo ,val) (write val) (newline)))
=> "bar"
Note the difference in the use of quasiquote (aka `) in the pattern
for (foo ,val): match syntax uses it, pmatch does not.
In Scheme, quasiquote and unquote always come together.
Is pmatch syntax in bad taste? I'm looking for opinions.
Another example is sxml-match, which omits use of quasiquote.
I have written a variation of sxml-match. Should I keep the sxml-match
usage, which keeps it compatible with sxml-match, or adopt that
used by (ice-9 match)?
Matt
next reply other threads:[~2020-03-29 15:11 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-29 15:11 Matt Wette [this message]
2020-03-29 22:07 ` syntax taste: use of unquote in macros Zelphir Kaltstahl
2020-03-30 10:34 ` tomas
2020-03-30 23:43 ` Matt Wette
2020-03-31 9:19 ` tomas
2020-03-30 13:07 ` Arne Babenhauserheide
2020-03-31 16:56 ` Ludovic Courtès
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