04835b5339
Because pkgs.racket-lang doesn't seem to accept paths like .../repo.git#branch?tag So I'm trying to remove the ?tag
94 lines
2.7 KiB
Racket
94 lines
2.7 KiB
Racket
#lang typed/racket/base
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;; TODO
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;; map passing, but cury failig; can't make a lambda like I'd like to
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;; -----------------------------------------------------------------------------
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;; Track procedure arity
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;; Applications:
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;; - vectorized ops
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;; - (TODO) improve apply/map? ask Leif
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;; - TODO get types, not arity
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(provide
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curry:
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map:
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;; --
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(for-syntax
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fun-define
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fun-let)
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)
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;; -----------------------------------------------------------------------------
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(require
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(for-syntax
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typed/racket/base
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syntax/parse
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racket/syntax
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trivial/private/common
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))
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;; =============================================================================
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(begin-for-syntax
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(define TYPE-KEY 'type-label)
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(define (formal->type x)
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(or (syntax-property x TYPE-KEY)
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(format-id x "Any"))) ;; Could just use TR's Any from here
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(define (parse-procedure-arity stx)
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(syntax-parse stx #:literals (: #%plain-lambda lambda)
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[(#%plain-lambda (x*:id ...) e* ...)
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(map formal->type (syntax-e #'(x* ...)))]
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;; TODO polydots, keywords, optional args
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;; TODO standard library functions
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[_ #f]))
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(define-values (arity-key fun? fun-define fun-let)
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(make-value-property 'procedure:arity parse-procedure-arity))
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(define-syntax-class/predicate procedure/arity fun?)
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)
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;; -----------------------------------------------------------------------------
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(define-syntax (curry: stx)
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(syntax-parse stx
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[(_ p:procedure/arity)
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#:with x* (for/list ([_t (in-list (syntax-e #'p.evidence))]) (gensym))
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#:with p+ (for/fold ([e (quasisyntax/loc stx (p.expanded #,@#'x*))])
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([x (in-list (reverse (syntax-e #'x*)))]
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[t (in-list (syntax-e #'p.evidence))])
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(quasisyntax/loc stx
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(lambda ([#,x : #,t]) #,e)))
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(syntax/loc stx p+)]
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[_
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(raise-user-error 'curry "Fail at: ~a" (syntax->datum stx))]))
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;; TODO try the other direction, inferring type from arguments.
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;; (may not be practical here, may need to be inside TR)
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(define-syntax map: (make-alias #'map
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(lambda (stx) (syntax-parse stx
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[(_ p:procedure/arity e* ...)
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;; --
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#:when
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(let ([num-expected (length (syntax-e #'p.evidence))]
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[num-actual (length (syntax-e #'(e* ...)))])
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(unless (= num-expected num-actual)
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(apply raise-arity-error
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'map:
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num-expected
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(map syntax->datum (syntax-e #'(e* ...))))))
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;; --
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#:with Listof-stx (format-id stx "Listof")
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#:with (e+* ...)
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(for/list ([t (in-list (syntax-e #'p.evidence))]
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[e (in-list (syntax-e #'(e* ...)))])
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(quasisyntax/loc stx (ann #,e (Listof-stx #,(format-id stx "~a" (syntax-e t))))))
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(syntax/loc stx (map p.expanded e+* ...))]))))
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