52 lines
1.1 KiB
Racket
52 lines
1.1 KiB
Racket
#lang s-exp "cur-redex.rkt"
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(provide ->
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->*
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forall*
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lambda*
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case*
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define-theorem
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qed)
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(define-syntax (-> syn)
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(syntax-case syn ()
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[(_ t1 t2)
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(with-syntax ([(x) (generate-temporaries '(1))])
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#`(forall (x : t1) t2))]))
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(define-syntax ->*
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(syntax-rules ()
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[(->* a) a]
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[(->* a a* ...)
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(-> a (->* a* ...))]))
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(define-syntax forall*
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(syntax-rules (:)
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[(_ (a : t) (ar : tr) ... b)
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(forall (a : t)
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(forall* (ar : tr) ... b))]
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[(_ b) b]))
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(define-syntax lambda*
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(syntax-rules (:)
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[(_ (a : t) (ar : tr) ... b)
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(lambda (a : t)
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(lambda* (ar : tr) ... b))]
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[(_ b) b]))
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(begin-for-syntax
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(define (rewrite-clause clause)
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(syntax-case clause (:)
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[((con (a : A) ...) body) #'(con (lambda* (a : A) ... body))]
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[(e body) #'(e body)])))
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(define-syntax (case* syn)
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(syntax-case syn ()
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[(_ e clause* ...)
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#`(case e #,@(map rewrite-clause (syntax->list #'(clause* ...))))]))
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(define-syntax-rule (define-theorem name prop)
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(define name prop))
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(define-syntax-rule (qed thm pf)
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((lambda (x : thm) T) pf))
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