struct-map for simple cases of transparent as well as prefab by default
This commit is contained in:
parent
a6d66194d1
commit
f94d2a3c9f
|
@ -23,6 +23,10 @@
|
||||||
(define m (cond
|
(define m (cond
|
||||||
[(struct-mappable? x) (extract-struct-mapper x)]
|
[(struct-mappable? x) (extract-struct-mapper x)]
|
||||||
[(prefab-struct-key x) => prefab-struct-mapper]
|
[(prefab-struct-key x) => prefab-struct-mapper]
|
||||||
|
[(struct? x)
|
||||||
|
(define-values (struct-type skipped?) (struct-info x))
|
||||||
|
(when skipped? (error name "Partial struct-info for ~v" x))
|
||||||
|
(transparent-struct-mapper struct-type)]
|
||||||
[else (error name "No struct-map property or mapper for ~v" x)]))
|
[else (error name "No struct-map property or mapper for ~v" x)]))
|
||||||
(m f seed x))
|
(m f seed x))
|
||||||
|
|
||||||
|
@ -33,3 +37,11 @@
|
||||||
(define-values (new-field new-seed) (f old-field old-seed))
|
(define-values (new-field new-seed) (f old-field old-seed))
|
||||||
(values (cons new-field new-fields) new-seed)))
|
(values (cons new-field new-fields) new-seed)))
|
||||||
(values (apply make-prefab-struct key (reverse new-fields)) final-seed))
|
(values (apply make-prefab-struct key (reverse new-fields)) final-seed))
|
||||||
|
|
||||||
|
(define ((transparent-struct-mapper struct-type) f initial-seed x)
|
||||||
|
(define-values (new-fields final-seed)
|
||||||
|
(for/fold ([new-fields '()] [old-seed initial-seed])
|
||||||
|
([old-field (cdr (vector->list (struct->vector x)))])
|
||||||
|
(define-values (new-field new-seed) (f old-field old-seed))
|
||||||
|
(values (cons new-field new-fields) new-seed)))
|
||||||
|
(values (apply (struct-type-make-constructor struct-type) (reverse new-fields)) final-seed))
|
||||||
|
|
Loading…
Reference in New Issue