112 lines
3.0 KiB
Racket
112 lines
3.0 KiB
Racket
#lang typed/racket/base
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;; TODO integrate with trivial/math to get ints from identifiers
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(provide
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define-vector:
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let-vector:
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;vector-length:
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vector-ref:
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;vector-set!:
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;vector-map:
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;vector-append:
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;vector->list
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;; TODO and a few more
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;; --- private
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(for-syntax parse-vector-length)
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)
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;; -----------------------------------------------------------------------------
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(require
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(only-in racket/unsafe/ops
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unsafe-vector-ref)
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(for-syntax
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typed/racket/base
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syntax/id-table
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syntax/parse
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syntax/stx
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))
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;; =============================================================================
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(define-for-syntax vector-length-key 'vector:length)
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(define-for-syntax errloc-key 'vector:)
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(define-for-syntax id+vector-length (make-free-id-table))
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(begin-for-syntax (define-syntax-class literal-vector
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#:attributes (vector-length)
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(pattern [e* ...]
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#:with len (parse-vector-length #'(e* ...))
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#:when (syntax-e #'len)
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#:attr vector-length #'len)
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))
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(define-syntax (define-vector: stx)
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(syntax-parse stx
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[(_ name:id v:literal-vector)
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(free-id-table-set! id+vector-length
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#'name
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(syntax-e #'v.vector-length))
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#'(define name v)]
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[(_ e* ...)
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#'(define e* ...)]))
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(define-syntax (let-vector: stx)
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(syntax-parse stx
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[(_ ([name:id v:literal-vector]) e* ...)
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#'(let ([name v])
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(let-syntax ([name (make-rename-transformer
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(syntax-property #'name
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vector-length-key
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#'v.vector-length))])
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e* ...))]
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[(_ e* ...)
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#'(let e* ...)]))
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(define-for-syntax (vector-ref-error v i reason)
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(raise-argument-error
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errloc-key
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(format "Index out-of-bounds: ~a" i)
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v))
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(define-syntax (vector-ref: stx)
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(syntax-parse stx
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[(_ v i:nat)
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#:when (printf "ref: getting langth for ~a\n" (syntax->datum #'v))
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#:with len (parse-vector-length #'v)
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#:when (printf "ref: got langth ~a\n" (syntax->datum #'len))
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#:when (syntax-e #'len)
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(unless (< (syntax-e #'i) (syntax-e #'len))
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(vector-ref-error (syntax-e #'v) (syntax-e #'i)))
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(syntax/loc stx (unsafe-vector-ref v i))]
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[(_ e* ...)
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(syntax/loc stx (vector-ref e* ...))]))
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;; -----------------------------------------------------------------------------
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;; Assume `stx` is creating a vector; get the length of the vector to-be-made
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(define-for-syntax (parse-vector-length stx)
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(cond
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[(syntax-property stx vector-length-key)
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=> (lambda (x) x)]
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[(identifier? stx)
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(free-id-table-ref id+vector-length stx #f)]
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[else
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(syntax-parse stx #:literals (vector make-vector build-vector)
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[(~or '#(e* ...)
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#(e* ...)
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;; TODO #{} #[] #6{} ...
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(vector e* ...))
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(length (syntax->list #'(e* ...)))]
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[(make-vector n:nat e* ...)
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(syntax-e #'n)]
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[(build-vector n:nat f)
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(syntax-e #'n)]
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[_ #f])]))
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