racket/collects/web-server/tests/lang/anormal-test.ss
Jay McCarthy 9cec27f49b Dealing with syntax by punting
svn: r6663
2007-06-14 20:25:46 +00:00

340 lines
13 KiB
Scheme

(module anormal-test mzscheme
(require (planet "test.ss" ("schematics" "schemeunit.plt" 2))
(lib "anormal.ss" "web-server" "lang")
(lib "util.ss" "web-server" "lang"))
(provide anormal-tests)
(define (empty-env var)
(error "empty environment"))
(define (extend env vars vals)
(lambda (var0)
(let loop ([vars vars]
[vals vals])
(cond
[(null? vars) (env var0)]
[(eqv? var0 (car vars))
(car vals)]
[else (loop (cdr vars) (cdr vals))]))))
;; alpha=/env: environment target-expr target-expr -> boolean
;; are two target expressions alpha-equivalent?
(define (alpha=/env env1 env2 expr1 expr2)
(syntax-case expr1 (if #%app)
[(if tst1 csq1)
(syntax-case expr2 (if)
[(if tst2 csq2) (and (alpha=/env env1 env2 #'tst1 #'tst2)
(alpha=/env env1 env2 #'csq1 #'csq2))]
[_else #f])]
[(if tst1 csq1 alt1)
(syntax-case expr2 (if)
[(if tst2 csq2 alt2) (and (alpha=/env env1 env2 #'tst1 #'tst2)
(alpha=/env env1 env2 #'csq1 #'csq2)
(alpha=/env env1 env2 #'alt1 #'alt2))]
[_else #f])]
[(#%app rator1 rands1 ...)
(syntax-case expr2 (#%app)
[(#%app rator2 rands2 ...)
(and (alpha=/env env1 env2 #'rator1 #'rator2)
(let loop ([rs1 (syntax->list #'(rands1 ...))]
[rs2 (syntax->list #'(rands2 ...))])
(or (and (null? rs1)
(null? rs2))
(and (alpha=/env env1 env2 (car rs1) (car rs2))
(loop (cdr rs1) (cdr rs2))))))]
[_else #f])]
[_else (w-alpha=/env env1 env2 expr1 expr2)]))
;; w-alpha=/env: env target-expr target-expr -> boolean
;; are two target vars or vals alpha-equivalent?
(define (w-alpha=/env env1 env2 expr1 expr2)
(syntax-case expr1 (#%top #%datum lambda quote)
[(#%top . var1)
(syntax-case expr2 (#%top)
[(#%top . var2)
(eqv? (syntax-object->datum #'var1)
(syntax-object->datum #'var2))]
[_else #f])]
[(#%datum . datum1)
(syntax-case expr2 (#%datum)
[(#%datum . datum2)
(let ([dat1 (syntax-object->datum #'datum1)]
[dat2 (syntax-object->datum #'datum2)])
(eqv? dat1 dat2))]
[_else #f])]
[(quote datum1)
(syntax-case expr2 (quote)
[(quote datum2)
(let ([dat1 (syntax-object->datum #'datum1)]
[dat2 (syntax-object->datum #'datum2)])
(equal? dat1 dat2))]
[_else #f])]
[(lambda formals1 body1)
(syntax-case expr2 (lambda)
[(lambda formals2 body2)
(let ([syms (map gensym (syntax->symbols (formals-list #'formals1)))])
(and (= (length syms) (length (formals-list #'formals2)))
(alpha=/env
(extend env1 (syntax->symbols (formals-list #'formals1)) syms)
(extend env2 (syntax->symbols (formals-list #'formals2)) syms)
#'body1 #'body2)))]
[_else #f])]
[x1 (symbol? (syntax-object->datum #'x1))
(syntax-case expr2 ()
[x2 (symbol? (syntax-object->datum #'x2))
(or (module-identifier=? #'x1 #'x2)
(eqv? (env1 (syntax-object->datum #'x1))
(env2 (syntax-object->datum #'x2))))]
[_else #f])]
[_else #f]))
;; convert syntax into a list of symbols
(define (syntax->symbols stx)
(syntax-case stx ()
[(vars ...)
(map
(lambda (s)
(syntax-object->datum s))
(syntax->list #'(vars ...)))]))
;; alph=: target-expr target-expr -> boolean
;; are two target expressions alpha-equivalent?
(define (alpha= expr1 expr2)
(define r (alpha=/env empty-env empty-env expr1 expr2))
(unless r
(error 'alpha= "Not alpha=:\t~S~n\t~S~n" (syntax-object->datum expr1) (syntax-object->datum expr2)))
r)
(define normalize-term (make-anormal-term (lambda _ (error 'anormal "No elim-letrec given."))))
(define anormal-tests
(test-suite
"Anormalization"
(test-suite
"Base Cases"
(test-case
"Top level identifier"
(check alpha= (normalize-term (expand (syntax car)))
(expand (syntax car))))
(test-case
"Simple arithmetic expression"
(check alpha= (normalize-term (expand (syntax (+ 1 1))))
(expand (syntax (+ 1 1)))))
(test-case
"lambda-expression with constant body"
(check alpha= (normalize-term (expand (syntax (lambda (x) 3))))
(expand (syntax (lambda (x) 3)))))
(test-case
"lambda-expression with var-ref body"
(check alpha= (normalize-term (expand (syntax (lambda (x) x))))
(expand (syntax (lambda (x) x)))))
(test-case
"lambda-expression/constant-body/multiple formals"
(check alpha= (normalize-term (expand (syntax (lambda (x y z) 3))))
(expand (syntax (lambda (x y z) 3)))))
(test-case
"one-armed-if"
(check alpha= (normalize-term (expand (syntax (if #t 1))))
(expand (syntax (if #t 1 (void))))))
(test-case
"two-armed-if"
(check alpha= (normalize-term (expand (syntax (if #t 1 2))))
(expand (syntax (if #t 1 2)))))
(test-case
"let/var-ref in body"
(check alpha= (normalize-term (expand (syntax (let ([x 1]) x))))
(expand (syntax ((lambda (x) x) 1)))))
(test-case
"call to void"
(check alpha= (normalize-term (expand (syntax (void))))
(expand (syntax (void)))))
(test-case
"primitive application/multiple arguments"
(check alpha= (normalize-term (expand (syntax (+ 1 2 3))))
(expand (syntax (+ 1 2 3)))))
(test-case
"empty-list"
(check alpha= (normalize-term (expand (syntax ())))
(expand (syntax ()))))
(test-case
"quoted list of constants"
(check alpha= (normalize-term (expand (syntax '(1 2 3))))
(expand (syntax '(1 2 3))))))
(test-suite
"Inductive Cases"
(test-case
"nested primitive applications with multiple arguments"
(check alpha= (normalize-term (expand (syntax (* (+ 1 2) 3))))
(expand (syntax ((lambda (x) (* x 3)) (+ 1 2))))))
(test-case
"one-armed if with prim-app in test posn"
(check alpha= (normalize-term (expand (syntax (if (+ 1 2) 3))))
(expand (syntax ((lambda (x) (if x 3 (void))) (+ 1 2))))))
(test-case
"two-armed if with prim-app in test posn"
(check alpha= (normalize-term (expand (syntax (if (+ 1 2) 3 4))))
(expand (syntax ((lambda (x) (if x 3 4)) (+ 1 2))))))
(test-case
"nested single argument primitive applications"
(check alpha= (normalize-term (expand (syntax (* (+ 1)))))
(expand (syntax ((lambda (x0) (* x0)) (+ 1))))))
(test-case
"deeply nested primitive applications"
(check alpha= (normalize-term (expand (syntax (* (+ (+ (+ 1 2) 3) 4) (+ 5 6)))))
(expand (syntax ((lambda (x0)
((lambda (x1)
((lambda (x2)
((lambda (x3) (* x2 x3))
(+ 5 6)))
(+ x1 4)))
(+ x0 3)))
(+ 1 2))))))
(test-case
"deeply nested primitive applications"
(check alpha= (normalize-term (expand (syntax (* (+ 1 2) (+ 1 (+ 2 (+ 3 4)))))))
(expand (syntax ((lambda (x0)
((lambda (x1)
((lambda (x2)
((lambda (x3)
(* x0 x3))
(+ 1 x2)))
(+ 2 x1)))
(+ 3 4)))
(+ 1 2))))))
(test-case
"if nested in test position"
(check alpha= (normalize-term (expand (syntax (if (if #t #f #t) #t #t))))
(expand (syntax ((lambda (x) (if x #t #t)) (if #t #f #t))))))
(test-case
"procedure/body has nested if"
(check alpha= (normalize-term (expand (syntax (lambda (x) (if (if x 1 2) 3 4)))))
(expand (syntax (lambda (x)
((lambda (y0) (if y0 3 4))
(if x 1 2)))))))
(test-case
"constant 0-arg procedure application"
(check alpha= (normalize-term (expand (syntax ((lambda () 3)))))
(expand (syntax ((lambda () 3))))))
(test-case
"if with function application in test"
(check alpha= (normalize-term (expand (syntax (if ((lambda () 7)) 1 2))))
(expand (syntax ((lambda (x) (if x 1 2))
((lambda () 7)))))))
(test-case
"if with lambda-expression in consequent and alternative"
(check alpha= (normalize-term (expand (syntax ((if #t (lambda () 1) (lambda () 2))))))
(expand (syntax ((lambda (x) (x)) (if #t (lambda () 1) (lambda () 2)))))))
(test-case
"call/cc with value argument"
(check alpha= (normalize-term (expand (syntax (call/cc (lambda (x) x)))))
(expand (syntax (call/cc (lambda (x) x))))))
(test-case
"call/cc with complex expression in argument"
(check alpha= (normalize-term (expand (syntax (call/cc (f (g 7))))))
(expand (syntax ((lambda (x0)
((lambda (x1) (call/cc x1))
(f x0)))
(g 7)))))))
(test-suite
"Additional tests"
(test-case
"multiple body expressions in lambda"
(check alpha= (normalize-term (expand (syntax (lambda (x y z) 3 4))))
(expand (syntax (lambda (x y z)
(call-with-values (lambda () 3)
(lambda throw-away 4)))))))
(test-case
"zero-or-more argument lambda"
(check alpha= (normalize-term (expand (syntax (lambda x x))))
(expand (syntax (lambda x x)))))
(test-case
"multi-valued let-values"
(check alpha= (normalize-term (expand (syntax (let-values ([(x y) (values 1 2)]) (+ x y)))))
(expand (syntax (call-with-values (lambda () (values 1 2))
(lambda (x y) (+ x y)))))))
(test-case
"let/multiple clauses before body"
(check alpha= (normalize-term (expand (syntax (let ([x 1] [y 2]) (+ x y)))))
(expand (syntax ((lambda (x)
((lambda (y)
(+ x y))
2))
1))))))
(test-suite
"Miscellaneous tests"
(test-case
"empty begin"
(check alpha= (normalize-term (expand (syntax (begin))))
(syntax (#%app (#%top . void)))))
(test-case
"begin with one expression"
(check alpha= (normalize-term (expand (syntax (begin 1))))
(syntax (#%datum . 1))))
(test-case
"begin with multiple expressions"
(check alpha= (normalize-term (expand (syntax (begin 1 2 3))))
(normalize-term (expand (syntax (call-with-values
(lambda () 1)
(lambda throw-away
(call-with-values
(lambda () 2)
(lambda throw-away
3)))))))))
(test-case
"cond expression"
(check-true
(and
(with-handlers ([(lambda (x) #t)
(lambda (the-exn) #f)])
(normalize-term
(expand
(syntax
(cond
[(null? l) 1]
[(zero? (car l)) (k 0)]
[else
(* (car l) (cdr l))])))))
#t)))
(test-not-exn "define-struct" (lambda () (normalize-term (expand (syntax (define-struct posn (x y)))))))
(test-not-exn "quote-syntax: #f" (lambda () (parameterize ([transformer? #f])
(normalize-term (expand (syntax #'provide/contract-id-set-a-date-day!))))))
(test-not-exn "quote-syntax: #t" (lambda () (parameterize ([transformer? #t])
(normalize-term (expand (syntax #'provide/contract-id-set-a-date-day!))))))
))))