45 lines
1.3 KiB
Scheme
45 lines
1.3 KiB
Scheme
#lang scheme/base
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(require syntax/stx
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(for-template scheme/base
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syntax/stx
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scheme/stxparam
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unstable/struct
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"runtime.ss"))
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(provide (all-defined-out))
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(define (get-kind kind)
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(syntax-case kind ()
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[#:pair pairK]
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[#:vector vectorK]
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[#:box boxK]
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[(#:pstruct key)
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(make-kind #`(lambda (x)
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(let ([xkey (prefab-struct-key x)])
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(and xkey (equal? xkey (quote key)))))
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(list (lambda (s d)
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#`(datum->syntax #,s (struct->list #,d) #,s)))
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(list #'dfc-add-unpstruct))]))
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;; A Kind is
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;; (make-kind id (listof (id id -> stx)) (listof expr))
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(define-struct kind (predicate selectors frontier-procs) #:transparent)
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(define pairK
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(make-kind #'pair?
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(list (lambda (s d) #`(car #,d))
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(lambda (s d) #`(datum->syntax #,s (cdr #,d) #,s)))
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(list #'dfc-add-car
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#'dfc-add-cdr)))
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(define vectorK
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(make-kind #'vector?
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(list (lambda (s d)
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#`(datum->syntax #,s (vector->list #,d) #,s)))
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(list #'dfc-add-unvector)))
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(define boxK
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(make-kind #'box?
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(list (lambda (s d) #`(unbox #,d)))
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(list #'dfc-add-unbox)))
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