150 lines
4.7 KiB
Racket
150 lines
4.7 KiB
Racket
#lang typed/racket
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(require (for-syntax racket/syntax
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racket/function
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syntax/parse
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(submod "../lib/low.rkt" untyped))
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"../lib/low.rkt"
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"get.lp2.rkt"
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"../type-expander/type-expander.lp2.rkt")
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(provide car!
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cdr!
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map:
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compose-maps)
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(module+ private-tests
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(provide λdeep-map
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deep-map
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deep-map-auto))
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(module m typed/racket
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(provide car! cdr!)
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(: car! (∀ (A) (→ (U (Listof A) (Pairof A Any)) A)))
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(define (car! x) (if (pair? x)
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(car x)
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(car x)))
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(: cdr! (∀ (A) (case→ (→ (Listof A) (Listof A))
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(→ (Pairof Any A) A))))
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(define (cdr! x) (cdr x)))
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(require 'm)
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(define-syntax (dbg stx)
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(syntax-parse stx
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[(_ (~optional (~and norun #:norun)) code)
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(if (attribute norun)
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#'(ann 'code Any)
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#'code)]))
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(begin-for-syntax
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(define-syntax-class >0 (pattern :exact-positive-integer)))
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(begin-for-syntax
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(define-syntax-class ≥0 (pattern :exact-nonnegative-integer)))
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(define-type-expander (Deep-Listof stx)
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(syntax-parse stx
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[(_ 0 T)
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#'T]
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[(_ d:>0 T)
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#`(Listof (Deep-Listof #,(sub1 (syntax-e #'d)) T))]))
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(define-syntax (λdeep-map stx)
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(syntax-parse stx
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[(_ {∀-type:id …} A:expr B:expr 0)
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#'(ann (λ (f x) (f x))
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(∀ (∀-type …)
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(→ (→ A B) A B)
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;; Use the type below to allow identity functions, but it's more
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;; heavy on the typechecker
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#;(case→ (→ (→ A B) A B)
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(→ (→ A A) A A))))]
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[(_ (~and norun #:norun) … {∀-type:id …} A:expr B:expr d:≥0)
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(define/with-syntax local-map (generate-temporary #'map))
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#`(dbg norun …
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(let ()
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(: local-map
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(∀ (∀-type …)
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(→ (→ A B) (Deep-Listof d A) (Deep-Listof d B))
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;; Use the type below to allow identity functions, but it's
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;; more heavy on the typechecker
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#;(case→ (→ (→ A B) (Deep-Listof d A) (Deep-Listof d B))
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(→ (→ A A) (Deep-Listof d A) (Deep-Listof d A)))))
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(define (local-map f l)
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(if (null? l)
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'()
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(cons ((λdeep-map {∀-type …} A B #,(sub1 (syntax-e #'d)))
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f (car l))
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(local-map f (cdr l)))))
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local-map))]))
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(define-syntax (deep-map stx)
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(syntax-parse stx
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[(_ {∀-type:id …} A:expr B:expr d:≥0 f:expr l:expr)
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(syntax/loc #'f ((λdeep-map {∀-type …} A B d) f l))]))
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;; We provide hints for the types of some common functions
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(define-type-expander (ArgOf stx)
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(syntax-parse stx
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[(_ (~literal length) T:expr R) #'(Listof Any)]
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[(_ (~literal car) T:expr R) #'(Pairof T Any)]
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[(_ (~literal car!) T:expr R) #'(U (Listof T) (Pairof T Any))]
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[(_ (~literal cdr) T:expr R) #'(Pairof Any T)]
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[(_ (~literal list) T:expr R) #'T]
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[(_ ((~literal λget) f …) T:expr R) #'(has-get T f …)]
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;; Default case:
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[(_ f:expr T:expr R) #'T]))
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(define-type-expander (ResultOf stx)
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(syntax-parse stx
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[(_ (~literal length) T:expr R) #'Index]
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[(_ (~literal car) T:expr R) #'T]
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[(_ (~literal car!) T:expr R) #'T]
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[(_ (~literal cdr) T:expr R) #'T]
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[(_ (~literal list) T:expr R) #'(List T)]
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[(_ ((~literal λget) f …) T:expr R) #'(result-get T f …)]
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;; Default case:
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[(_ f:expr T:expr R) #'R]))
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(define-syntax (substitute-function stx)
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(syntax-parse stx
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[(_ (~literal list)) #'(λ #:∀ (X) ([x : X]) : (List X) (list x))]
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;; Default case:
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[(_ f:expr) #'f]))
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(define-syntax/parse (deep-map-auto d:≥0 f l)
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#'(deep-map {A B} (ArgOf f A B) (ResultOf f A B) d (substitute-function f) l))
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;; Now we turn all map: calls into the form
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;; (compose-maps [(d f) …] [l …])
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(define-syntax (compose-maps stx)
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(syntax-parse stx
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[(_ [] [l])
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#'l]
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[(_ [] [l:expr …])
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#'(values l …)]
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[(_ [(d:≥0 f:expr) (d-rest:≥0 f-rest:expr) …] [l:expr …])
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#'(deep-map-auto d f (compose-maps [(d-rest f-rest) …] [l …]))]))
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(define-for-syntax (transform-map: depth stx)
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(syntax-parse stx
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[((~literal curry) (~literal map) f:expr)
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(transform-map: (add1 depth) #'f)]
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[((~literal compose) f:expr …)
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(define/syntax-parse (([dd ff] …) …)
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(stx-map (curry transform-map: depth) #'(f …)))
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#`[(dd ff) … …]]
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[(~literal identity) #'[]]
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[(~literal values) #'[]]
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[f:expr
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#`[(#,depth f)]]))
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(define-syntax (map: stx)
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(syntax-parse stx
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[(_ f l) #`(compose-maps #,(transform-map: 1 #'f) [l])]))
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