Merge pull request #133 from AlexKnauth/immutable
add more vector stuff and make sure it uses immutable vectors
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0bffdc3e6d
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@ -84,8 +84,11 @@
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(λ (tgt) (f tgt))
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(λ (tgt v) (f-inv v))))
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(define (list->immutable-vector lst)
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(apply vector-immutable lst))
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(define list->vector-lens
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(inverse-function-lens list->vector vector->list))
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(inverse-function-lens list->immutable-vector vector->list))
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(module+ test
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(define vector-first-third-fifth-lens
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@ -94,6 +97,7 @@
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fifth-lens))
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(check-equal? (lens-view vector-first-third-fifth-lens '(a b c d e f))
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#(a c e))
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(check-pred immutable? (lens-view vector-first-third-fifth-lens '(a b c d e f)))
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(check-equal? (lens-set vector-first-third-fifth-lens '(a b c d e f) #(1 2 3))
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'(1 b 2 d 3 f)))
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@ -4,6 +4,7 @@
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"join.rkt"
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"list.rkt"
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"hash.rkt"
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"vector.rkt"
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"string.rkt"
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"view-set.rkt"
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"sublist.rkt"
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@ -17,6 +18,7 @@
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"join.rkt"
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"list.rkt"
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"hash.rkt"
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"vector.rkt"
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"string.rkt"
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"view-set.rkt"
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"sublist.rkt"
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@ -13,6 +13,7 @@ this library being backwards-compatible.
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@include-section["join.scrbl"]
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@include-section["list.scrbl"]
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@include-section["hash.scrbl"]
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@include-section["vector.scrbl"]
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@include-section["string.scrbl"]
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@include-section["syntax.scrbl"]
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@include-section["sublist.scrbl"]
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50
unstable/lens/vector.rkt
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50
unstable/lens/vector.rkt
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@ -0,0 +1,50 @@
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#lang racket/base
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(provide vector-ref-lens
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vector-ref-nested-lens
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vector-pluck-lens
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)
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(require fancy-app
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lens/base/main
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"arrow.rkt"
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"join.rkt"
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)
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(module+ test
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(require rackunit))
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(define (vector-ref-lens i)
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(make-lens
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(vector-ref _ i)
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(vector-set _ i _)))
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(define (vector-set v i x)
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(vector->immutable-vector
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(build-vector (vector-length v)
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(λ (j)
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(if (= i j)
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x
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(vector-ref v j))))))
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(define (vector-ref-nested-lens . is)
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(apply lens-thrush (map vector-ref-lens is)))
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(define (vector-pluck-lens . is)
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(apply lens-join/vector (map vector-ref-lens is)))
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(module+ test
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(check-equal? (lens-view (vector-ref-lens 0) #(a b c)) 'a)
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(check-equal? (lens-view (vector-ref-lens 1) #(a b c)) 'b)
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(check-equal? (lens-view (vector-ref-lens 2) #(a b c)) 'c)
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(check-equal? (lens-set (vector-ref-lens 0) #(a b c) "A") #("A" b c))
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(check-equal? (lens-set (vector-ref-lens 1) #(a b c) "B") #(a "B" c))
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(check-equal? (lens-set (vector-ref-lens 2) #(a b c) "C") #(a b "C"))
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(check-equal? (lens-transform (vector-ref-nested-lens 2 1) #(a #(b c) #(d e f)) symbol->string)
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#(a #(b c) #(d "e" f)))
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(define 1-5-6-lens (vector-pluck-lens 1 5 6))
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(check-equal? (lens-view 1-5-6-lens #(a b c d e f g))
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#(b f g))
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(check-equal? (lens-set 1-5-6-lens #(a b c d e f g) #(1 2 3))
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#(a 1 c d e 2 3))
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)
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31
unstable/lens/vector.scrbl
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31
unstable/lens/vector.scrbl
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@ -0,0 +1,31 @@
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#lang scribble/manual
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@(require lens/doc-util/main)
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@title{Vector lenses}
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@defproc[(vector-ref-lens [i exact-nonnegative-integer?]) lens?]{
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Returns a lens that views an element of a vector.
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@lenses-unstable-examples[
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(lens-view (vector-ref-lens 2) #(a b c d))
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(lens-set (vector-ref lens 2) #(a b c d) "sea")
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]}
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@defproc[(vector-ref-nested-lens [i exact-nonnegative-integer?] ...) lens?]{
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Like @racket[list-ref-nested-lens], but for vectors.
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Equivalent to @racket[(lens-thrush (vector-ref-lens i) ...)].
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@lenses-unstable-examples[
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(lens-view (vector-ref-nested-lens 2 1) #(a b #(s i) d))
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(lens-set (vector-ref-nested-lens 2 1) #(a b #(s i) d) "eye")
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]}
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@defproc[(vector-pluck-lens [i exact-nonnegative-integer?] ...) lens?]{
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Like @racket[list-refs-lens], but for vectors.
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Equivalent to @racket[(lens-join/vector (vector-ref-lens i) ...)].
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@lenses-unstable-examples[
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(define 1-5-6-lens (vector-pluck-lens 1 5 6))
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(check-equal? (lens-view 1-5-6-lens #(a b c d e f g))
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#(b f g))
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(check-equal? (lens-set 1-5-6-lens #(a b c d e f g) #(1 2 3))
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#(a 1 c d e 2 3))
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]}
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