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test.rkt
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test.rkt
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#lang racket
(require "class.rkt")
(require drracket/check-syntax
(for-syntax syntax/parse)
rackunit
syntax/macro-testing)
(begin-for-syntax (define v (box 0)))
(test-case "simple class"
(define foo%
(class
(field x)
(define (add y) (+ x y))))
(define foo (new foo% 1))
(check-equal? (send foo add 2) 3))
(test-case "empty class"
(define foo% (class))
(new foo%)
(void))
(test-case "internal method call"
(define foo%
(class
(define (f x)
(send this g x))
(define (g x)
(add1 x))))
(define foo (new foo%))
(check-equal? (send foo f 1) 2))
(test-case "mutually recursive methods"
(define parity%
(class
(define (even? n)
(if (= n 0)
#t
(send this odd? (sub1 n))))
(define (odd? n)
(if (= n 0)
#f
(send this even? (sub1 n))))))
(define parity (new parity%))
(check-equal? (send parity even? 10) #t)
(check-equal? (send parity even? 11) #f))
(test-case "mutating a field"
(define counter%
(class
(field count)
(define (inc) (set! count (add1 count)))
(define (get) count)))
(define counter (new counter% 0))
(send counter inc)
(send counter inc)
(send counter inc)
(check-equal? (send counter get) 3))
(test-case "mutating a field in the constructor"
(define counter%
(class
(field count)
(set! count (add1 count))
(define (get) count)))
(check-equal? (send (new counter% 0) get) 1))
(test-case "use a macro that expands to a definition"
(define-syntax-rule (m x) (define x (lambda () 2)))
(define foo%
(class
(m x)))
(define foo (new foo%))
(check-equal? (send foo x) 2))
(test-case "use a macro that expands to field"
(define-syntax-rule (m x) (field x))
(define foo%
(class
(m x)
(define (f) (add1 x))))
(define foo (new foo% 1))
(check-equal? (send foo f) 2))
(test-case "define and use a macro inside of a class"
(define foo%
(class
(define-syntax-rule (m x) (field x))
(define-syntax-rule (my-add1 x) (add1 x))
(m x)
(define (f) (my-add1 x))))
(define foo (new foo% 1))
(check-equal? (send foo f) 2))
(test-case "defines in a begin"
(define foo%
(class
(begin
(define-syntax-rule (m x) (field x))
(define-syntax-rule (my-add1 x) (add1 x))
(m x)
(define (f) (my-add1 x)))))
(define foo (new foo% 1))
(check-equal? (send foo f) 2))
(test-case "defines in a nested begin"
(define foo%
(class
(begin
(begin
(define-syntax-rule (m x) (field x))
(define-syntax-rule (my-add1 x) (add1 x))
(m x)
(define (f) (my-add1 x))))))
(define foo (new foo% 1))
(check-equal? (send foo f) 2))
(test-case "shadow method name"
(define foo%
(let* ([f 42]
[foo% (class (define (f) 2))])
foo%))
(define foo (new foo%))
(let ([f 42])
(check-equal? (send foo f) 2)))
(test-case "macro expands to a reference to a locally defined value"
(define foo%
(class
(define-syntax-rule (call-g) (g))
(define (g) 2)
(define (f) (call-g))))
(define foo (new foo%))
(check-equal? (send foo f) 2))
(test-case "internal-definition-context-add-scopes regression test"
(define-syntax-rule (x) 'good)
(define-syntax-rule (m f) (define (f) (x)))
(define c%
(class
(define-syntax-rule (x) 'bad2)
(m f)))
(check-equal? (send (new c%) f) 'good))
(test-case "duplicate method name error"
(check-exn #rx"defined"
(lambda ()
(convert-syntax-error
(class
(define (f) 2)
(define (f) 2))))))
(test-case "duplicate method name error, macro introduced"
(check-exn #rx"defined"
(lambda ()
(convert-syntax-error
(let ()
(define-syntax-rule (m) (define (f) 2))
(class
(m)
(define (f) 2)))))))
(test-case "method used as procedure"
(define foo%
(class(define-syntax-rule
(test-case desc body ...)
(their-test-case desc (convert-compile-time-error (let () body ...))))
(define (f) 2)
(define (g) (f))))
(define foo (new foo%))
(check-equal? (send foo g) 2))
(test-case "method used as procedure with args"
(define foo%
(class
(define (f x y) (+ x y))
(define (g) (f 1 2))))
(define foo (new foo%))
(check-equal? (send foo g) 3))
(test-case "method used as reference"
(define foo%
(class
(define (f) 2)
(define (g) f)))
(define foo (new foo%))
(check-pred procedure? (send foo g)))
(test-case "method used in apply"
(define foo%
(class
(define (f x y) (+ x y))
(define (g) (apply f (list 1 2)))))
(define foo (new foo%))
(check-equal? (send foo g) 3))
(test-case "class-level expr"
(define v 'bad)
(define foo%
(class
(set! v 'good)))
(new foo%)
(check-equal? v 'good))
(test-case "multiple class-level exprs"
(define v 0)
(define foo%
(class
(set! v (add1 v))
(set! v (add1 v))))
(new foo%)
(check-equal? v 2))
(test-case "multiple class-level exprs"
(define v 0)
(define foo%
(class
(set! v (add1 v))
(set! v (add1 v))))
(new foo%)
(check-equal? v 2))
(test-case "class-level field usage"
(define foo%
(class
(field v)
(set! v 'good)
(define (get-v) v)))
(define foo (new foo% #f))
(check-equal? (send foo get-v) 'good))
(test-case "class-level method usage"
(define v 'bad)
(define foo%
(class
(define (m) (set! v 'good))
(m)))
(new foo%)
(check-equal? v 'good))
(test-case "method shadows macro"
(define v #f)
(define-syntax-rule (m e ...) (set! v 'bad))
(define foo%
(class
(define (m) (set! v 'good))
(m)))
(new foo%)
(check-equal? v 'good))
(test-case "method shadows macro after use"
; I was surprised, but racket class works this way too!
; The expansion depends on the order
; Makes sense since the expr is actually expanded before the method is bound
(define v #f)
(define-syntax-rule (m e ...) (set! v 'good))
(define foo%
(class
(m)
(define (m) (set! v 'bad))))
(new foo%)
(check-equal? v 'good))
(test-case "local macro use before definition"
(define v 'bad)
(new (class
(m)
(define-syntax-rule (m) (set! v 'good))))
(check-equal? v 'good))
(test-case "class-level 'this'"
(define v 'bad)
(define foo%
(class
(define (f) (set! v 'good))
(send this f)))
(new foo%)
(check-equal? v 'good))
(test-case "class-level 'this' alone"
(define v 'bad)
(define foo%
(class
(define (f) (set! v 'good))
this))
(new foo%)
(void))
(test-case "local macro emits this"
(define v #f)
(define foo
(new (class
(define-syntax-rule (m) this)
(set! v (m)))))
(check-equal? foo v))
(test-case "transformers only get evaluated once"
(class
(define-syntax m
(let ()
(set-box! v (add1 (unbox v)))
(lambda (stx) #'42)))
(m))
(check-equal? (phase1-eval (unbox v)) 1))
(test-case "define multiple syntaxes"
(define v #f)
(new
(class
(define-syntaxes (double one) (values (syntax-rules () [(double e) (list e e)])
(syntax-rules () [(one) 1])))
(set! v (double (one)))))
(check-equal? v '(1 1)))
;; TODO this test only works when run without already having built with raco make. Disable for now.
#;(define-namespace-anchor a)
#;(test-case "disappeared props"
(define (num-arrows-of check-syntax-result)
(length (for/list ([vec check-syntax-result] #:when (equal? (vector-ref vec 0)
'syncheck:add-arrow/name-dup/pxpy))
vec)))
(define ns (namespace-anchor->namespace a))
(check-equal? (num-arrows-of
(show-content (quote-syntax (class
(define-syntax x #'a)
(define-syntax my-fields
(syntax-parser
[(_ name:id)
(define/syntax-parse field-name (syntax-local-value #'name))
(syntax-property #'(field field-name) 'disappeared-use (list (syntax-local-introduce #'name)))]))
(my-fields x)))
#:namespace ns))
2))