From: Attila Lendvai <attila@lendvai.name>
To: 60225@debbugs.gnu.org
Cc: Attila Lendvai <attila@lendvai.name>
Subject: [bug#60225] [PATCH] records: match-record supports specifying a different variable name.
Date: Tue, 20 Dec 2022 14:40:19 -0300 [thread overview]
Message-ID: <20221220174018.14433-1-attila@lendvai.name> (raw)
An example:
(match-record obj <my-type>
(field1 (field2 custom-var-name) field3)
...)
---
guix/records.scm | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)
diff --git a/guix/records.scm b/guix/records.scm
index 13463647c8..0b2487a156 100644
--- a/guix/records.scm
+++ b/guix/records.scm
@@ -592,13 +592,16 @@ (define-syntax lookup-field
(define-syntax match-record-inner
(lambda (s)
(syntax-case s ()
- ((_ record type (field rest ...) body ...)
- #`(let-syntax ((field-offset (syntax-rules ()
+ ((_ record type ((field-name variable-name) rest ...) body ...)
+ #'(let-syntax ((field-offset (syntax-rules ()
((_ f)
- (lookup-field field 0 f)))))
+ (lookup-field field-name 0 f)))))
(let* ((offset (type map-fields field-offset))
- (field (struct-ref record offset)))
+ (variable-name (struct-ref record offset)))
(match-record-inner record type (rest ...) body ...))))
+ ((_ record type (field rest ...) body ...)
+ ;; Redirect to the canonical form above.
+ #'(match-record-inner record type ((field field) rest ...) body ...))
((_ record type () body ...)
#'(begin body ...)))))
--
2.35.1
next reply other threads:[~2022-12-20 18:20 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-12-20 17:40 Attila Lendvai [this message]
2022-12-21 22:15 ` [bug#60225] [PATCH] records: match-record supports specifying a different variable name Ludovic Courtès
2022-12-22 2:14 ` [bug#60225] [PATCH v2 1/2] " Attila Lendvai
2022-12-22 2:14 ` [bug#60225] [PATCH v2 2/2] tests: records: Add a failing test for match-record Attila Lendvai
2022-12-27 22:53 ` [bug#60225] [PATCH] records: match-record supports specifying a different variable name Ludovic Courtès
2022-12-27 22:49 ` bug#60225: " Ludovic Courtès
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