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| author | (unmatched-parenthesis ew syntax <paren@disroot.org> | 2023-04-28 20:19:05 +0100 |
|---|---|---|
| committer | Josselin Poiret <dev@jpoiret.xyz> | 2023-06-04 10:59:25 +0200 |
| commit | 4cd529362108086eeec25d4d465261415cff45b3 (patch) | |
| tree | cbb0b3e462513d52260f8be7bcc8f2176fbf3840 /guix/records.scm | |
| parent | e6dc1d399663b9fab30ded8bcb716a5b1dbf8743 (diff) | |
records: Add MATCH-RECORD-LAMBDA.
* guix/records.scm (match-record-lambda): New syntax.
* tests/records.scm ("match-record-lambda"): New test.
Signed-off-by: Josselin Poiret <dev@jpoiret.xyz>
Diffstat (limited to 'guix/records.scm')
| -rw-r--r-- | guix/records.scm | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/guix/records.scm b/guix/records.scm index cfa46f0d80..2a88cb4b3c 100644 --- a/guix/records.scm +++ b/guix/records.scm @@ -31,7 +31,8 @@ alist->record object->fields recutils->alist - match-record)) + match-record + match-record-lambda)) ;;; Commentary: ;;; @@ -640,4 +641,15 @@ an unknown field is queried." (match-record-inner record type (fields ...) body ...) (throw 'wrong-type-arg record))))) +(define-syntax match-record-lambda + (syntax-rules () + "Return a procedure accepting a single record of the given TYPE for which each +FIELD will be bound to its FIELD name within the returned procedure. A syntax error +is raised if an unknown field is queried." + ((_ type (field ...) body ...) + (lambda (record) + (if (eq? (struct-vtable record) type) + (match-record-inner record type (field ...) body ...) + (throw 'wrong-type-arg record)))))) + ;;; records.scm ends here |