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improve contract-stronger for instanceof/c

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This commit is contained in:
Robby Findler 2014-09-21 05:33:06 -05:00
parent 9ea9d0eaf8
commit 9681032783
2 changed files with 18 additions and 2 deletions
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7
pkgs/racket-pkgs/racket-test/tests/racket/contract/stronger.rkt
View File

@ -2,7 +2,8 @@
(require "test-util.rkt")
(parameterize ([current-contract-namespace
(make-basic-contract-namespace 'racket/contract)])
(make-basic-contract-namespace 'racket/contract
'racket/class)])
(contract-eval '(define-contract-struct couple (hd tl)))
(contract-eval '(define-contract-struct triple (a b c)))
@ -149,6 +150,10 @@
(ctest #t contract-stronger? 'x symbol?)
(ctest #f contract-stronger? symbol? 'x)
(contract-eval
`(let ([c (class/c (m (-> any/c integer?)))])
(,test #t contract-stronger? (instanceof/c c) (instanceof/c c))))
;; chances are, this predicate will accept "x", but
;; we don't want to consider it stronger, since it
;; will not always accept "x".

13
racket/collects/racket/private/class-c-old.rkt
View File

@ -825,10 +825,12 @@
absents absent-fields
internal opaque? name)
#:omit-define-syntaxes
#:property prop:custom-write custom-write-property-proc
#:property prop:contract
(build-contract-property
#:projection class/c-proj
#:name build-class/c-name
#:stronger (λ (this that) (equal? this that))
#:first-order
(λ (ctc)
(λ (cls)
@ -1118,6 +1120,7 @@
(λ args (ret #f))))))
(define-struct base-object/c (methods method-contracts fields field-contracts)
#:property prop:custom-write custom-write-property-proc
#:property prop:contract
(build-contract-property
#:projection object/c-proj
@ -1187,14 +1190,22 @@
(and (object? val)
(contract-first-order-passes? cls-ctc (object-ref val))))))
(define (instanceof/c-stronger this that)
(and (base-instanceof/c? that)
(contract-stronger? (base-instanceof/c-class-ctc this)
(base-instanceof/c-class-ctc that))))
(define-struct base-instanceof/c (class-ctc)
#:property prop:custom-write custom-write-property-proc
#:property prop:contract
(build-contract-property
#:projection instanceof/c-proj
#:name
(λ (ctc)
(build-compound-type-name 'instanceof/c (base-instanceof/c-class-ctc ctc)))
#:first-order instanceof/c-first-order))
#:first-order instanceof/c-first-order
#:stronger instanceof/c-stronger))
(define (instanceof/c cctc)
(let ([ctc (coerce-contract 'instanceof/c cctc)])