c4f0f723f5
elim now runs. Parts of the stdlib have been converted to use elim, but it's complicated to program with. Need to implement case and fix in terms of elim, I think.
108 lines
3.8 KiB
Racket
108 lines
3.8 KiB
Racket
#lang s-exp "redex-curnel.rkt"
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(require "stdlib/sugar.rkt" "stdlib/prop.rkt" racket/trace
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(for-syntax racket/syntax))
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;; ---------
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(begin-for-syntax
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(define (rename_id i x)
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(format-id x "~a~a" x i)))
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(define-syntax (rename syn)
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(syntax-case syn ()
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[(_ i ls e)
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(syntax-case #`(ls #,(cur-expand #'e)) (Type forall Unv lambda :)
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[(_ Type) #'Type]
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[(_ (Unv n)) #'(Unv n)]
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[((xr ...) (lambda (x : t) e))
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#'(lambda (x : (rename i (xr ...) t))
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(rename i (xr ... x) e))]
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[((xr ...) (forall (x : t) e))
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#'(forall (x : (rename i (xr ...) t))
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(rename i (xr ... x) e))]
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[(ls (e1 e2))
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#'((rename i ls e1) (rename i ls e2))]
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[(ls x)
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(if (member (syntax->datum #'x) (syntax->datum #'ls))
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#'x
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(rename_id (syntax->datum #'i) #'x))])]))
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(trace-define-syntax (translate syn)
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(syntax-parse (cur-expand (syntax-case syn () [(_ e) #'e]))
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;; TODO: Need to add these to a literal set and export it
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;; Or, maybe redefine syntax-parse
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#:datum-literals (:)
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#:literals (lambda forall data real-app case Type)
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[Type
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#'(lambda* (x1 : Type) (x2 : Type) (->* x1 x2 Type))]
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[(forall (x : A) B)
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(let ([x1 (rename_id 1 #'x)]
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[x2 (rename_id 2 #'x)]
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[xr (rename_id 'r #'x)])
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#`(lambda* (f1 : (rename 1 () (forall (x : A) B)))
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(f2 : (rename 2 () (forall (x : A) B)))
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(forall* (#,x1 : (rename 1 () A)) (#,x2 : (rename 2 () A))
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(#,xr : (run ((translate A) #,x1 #,x2)))
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((translate B) (f1 #,x1) (f2 #,x2)))))]
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[(lambda (x : A) B)
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(let ([x1 (rename_id 1 #'x)]
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[x2 (rename_id 2 #'x)]
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[xr (rename_id 'r #'x)])
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#`(lambda* (f1 : (rename 1 () (forall (x : A) B)))
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(f2 : (rename 2 () (forall (x : A) B)))
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(forall* (#,x1 : (rename 1 () A))
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(#,x2 : (rename 2 () A))
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(#,xr : (run ((translate A) #,x1 #,x2)))
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((translate B) (f1 #,x1) (f2 #,x2)))))]
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[(data id : t (c : tc) ...)
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(let ([t #`(data #,(rename_id 'r #'id) : (translate t)
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((translate c) : (translate tc)) ...)])
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t)]
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[(f a)
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#`((translate f) (rename 1 () a) (rename 2 () a) (translate a))]
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[x:id
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;; TODO: Look up x and generate the relation. Otherwise I need to
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;; manually translate all dependencies.
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;; Not sure this is quite right; Racket's hygiene might `save' me.
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(rename_id 'r #'x)]
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[_ (raise-syntax-error "translate undefined for" syn)]))
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(define-type X Type)
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(define X1 X)
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(define X2 X)
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(define (Xr (x1 : X1) (x2 : X2)) true)
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;; The type of a CPS function
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(define-type CPSf (forall* (ans : Type) (k : (-> X ans)) ans))
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(define (CPSf-relation (f1 : CPSf) (f2 : CPSf))
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;; TODO: Fix run so I can simply use (run CPSf) to perform
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;; substitution
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(translate (run CPSf))
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(translate (forall* (ans : Type) (k : (-> X ans)) ans)))
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#;(module+ test
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(require rackunit)
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(check-equal?
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(translate (forall* (ans : Type) (k : (-> X ans)) ans))
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(forall* (ans1 : Type) (ans2 : Type) (ansr : (->* ans1 ans2 Type))
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(forall* (k1 : (-> X ans1)) (k2 : (-> X ans2))
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(kr : (forall* (_1 : X) (_2 : X) (_r : (Xr _1 _2))
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(ansr (k1 _1) (k2 _2))))
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(ansr (f1 ans1 k1) (f2 ans2 k2))))))
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;; By parametricity, every CPSf is related it itself in the CPS relation
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(define-type paramCPSf (forall* (f : CPSf) (CPSf-relation f f)))
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(define (id (X : Type) (x : X)) x)
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(define-theorem thm:continuation-shuffle
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(forall* (f : CPSf)
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(ans : Type)
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(ansr : (-> ans ans Type))
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(k : (-> X ans))
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(ansr (f ans k) (k (f ans (id ans))))))
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#;(define (rel (x1 : X) (x2 : X))
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(and (Xr x1 x2)
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))
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#;(paramCPSf f X X rel k k)
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