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| author | Ludovic Courtès <ludo@gnu.org> | 2015-01-19 22:50:57 +0100 |
|---|---|---|
| committer | Ludovic Courtès <ludo@gnu.org> | 2015-01-19 23:30:42 +0100 |
| commit | c492be654be7c994d39d5aa6a7575792baf9edb9 (patch) | |
| tree | 4e83df8abad1b40bf502ecbffaa23e9746276ebc /guix/records.scm | |
| parent | cf4efb394fb685f7762667f39378b88e7df87f36 (diff) | |
| download | gnu-guix-c492be654be7c994d39d5aa6a7575792baf9edb9.tar gnu-guix-c492be654be7c994d39d5aa6a7575792baf9edb9.tar.gz | |
records: Factorize value wrapping in the record constructor.
* guix/records.scm (make-syntactic-constructor)[wrap-field-value]: New
procedure.
[field-bindings, field-value]: Use it.
Diffstat (limited to 'guix/records.scm')
| -rw-r--r-- | guix/records.scm | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/guix/records.scm b/guix/records.scm index af6396f3dd..bef8ff861b 100644 --- a/guix/records.scm +++ b/guix/records.scm @@ -81,15 +81,18 @@ tuples, and THUNKED is the list of identifiers of thunked fields." (define (thunked-field? f) (memq (syntax->datum f) '#,thunked)) + (define (wrap-field-value f value) + (if (thunked-field? f) + #`(lambda () #,value) + value)) + (define (field-bindings field+value) ;; Return field to value bindings, for use in 'let*' below. (map (lambda (field+value) (syntax-case field+value () ((field value) #`(field - #,(if (thunked-field? #'field) - #'(lambda () value) - #'value))))) + #,(wrap-field-value #'field #'value))))) field+value)) (syntax-case s (inherit #,@fields) @@ -111,9 +114,7 @@ tuples, and THUNKED is the list of identifiers of thunked fields." car) (let ((value (car (assoc-ref dflt (syntax->datum f))))) - (if (thunked-field? f) - #`(lambda () #,value) - value)))) + (wrap-field-value f value)))) (let ((fields (append fields (map car dflt)))) (cond ((lset= eq? fields 'expected) |