103 lines
2.7 KiB
Racket
103 lines
2.7 KiB
Racket
#lang s-exp "list-lang.rkt"
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(provide all-remembered-list all-remembered-alist)
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;; For older versions:
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#|
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(require/typed unstable/list
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[(group-by group-by-untyped)
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(∀ (A B) (->* [(→ A B) (Listof A)]
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[(→ B B Any)]
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(Listof (Listof A))))])
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;; Circumvent problem with contracts: with the imported untyped version,
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;; two identical keys are never equal?. I think this is because the keys are
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;; wrapped with contracts when they are passed to equal?, and therefore are not
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;; equal?, because we're comparing two distinct contract wrappers, instead of
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;; comparing their contents.
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(: group-by (∀ (A B) (->* [(→ A B) (Listof A)]
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[(→ B B Any)]
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(Listof (Listof A)))))
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(define (group-by key lst [same? equal?])
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(group-by-untyped key lst (λ ([x : B] [y : B]) (same? x y))))
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|#
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(define all-remembered-alist
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(map (λ ([g : (Listof (Pairof Symbol Any))]) : (Pairof Symbol (Listof Any))
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(cons (caar g) (remove-duplicates (map (inst cdr Symbol Any) g))))
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(group-by (inst car Symbol Any) all-remembered-list)))
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(define-list-values all-remembered-list : (Listof (Pairof Symbol Any)))
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(structure a b c)
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(structure a b c d)
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(structure a b c y)
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(structure a b)
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(structure x y z)
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(structure)
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(structure f g)
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(structure faa fab fav)
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(structure fba fbv)
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(structure fav)
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(structure a)
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(structure a)
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(structure people/with-promises-type streets/with-promises-type)
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(structure houses/with-promises-type name/with-promises-type)
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(structure location/with-promises-type owner/with-promises-type)
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(structure name/with-promises-type)
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(structure people streets)
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(structure people streets)
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(structure houses name)
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(structure houses name)
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(structure location owner)
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(structure location owner)
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(structure name)
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(structure name)
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(structure houses/with-promises-type sname/with-promises-type)
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(structure houses sname)
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(structure houses sname)
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(structure f-a f-b)
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(structure f-a f-b f-c)
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(structure people)
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(structure streets)
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(structure location)
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(structure streets)
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(structure streets)
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(structure x)
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(structure x)
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(structure x)
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(structure sname)
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(structure sname)
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(structure sname)
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(structure st)
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(structure v)
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(structure v)
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(structure b1 b2 v)
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(structure a s v)
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(structure b1 b2 v)
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(structure b1 b2 v)
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(structure v w)
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(structure v w)
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(structure v w)
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(structure b1 b2 s v)
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(structure b1 b2 s v)
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(structure b1 b2 s v)
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(structure ab v)
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(structure ba v)
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(structure ab v)
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(structure ab v)
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(structure a c)
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(structure a c)
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(structure a1 s v)
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(structure a1 s v)
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(structure a1 s v)
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(structure returned)
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(structure returned)
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(structure returned)
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(structure returned)
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(structure foo)
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(structure foo)
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(structure foo)
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(structure foo)
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(structure foo)
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(structure foo)
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