Import Upstream version 2a6upstream/2a6

1 files changed, 160 insertions, 0 deletions

diff --git a/scmactst.scm b/scmactst.scm
new file mode 100644
index 0000000..3b71341
--- /dev/null
+++ b/scmactst.scm
@@ -0,0 +1,160 @@
+;;;"scmactst.scm" test syntactic closures macros
+;;; From "sc-macro.doc", A Syntactic Closures Macro Facility by Chris Hanson
+
+(define errs '())
+(define test
+  (lambda (expect fun . args)
+    (write (cons fun args))
+    (display "  ==> ")
+    ((lambda (res)
+       (write res)
+       (newline)
+       (cond ((not (equal? expect res))
+	      (set! errs (cons (list res expect (cons fun args)) errs))
+	      (display " BUT EXPECTED ")
+	      (write expect)
+	      (newline)
+	      #f)
+	     (else #t)))
+     (if (procedure? fun) (apply fun args) (car args)))))
+
+(require 'syntactic-closures)
+
+(macro:expand
+ '(define-syntax push
+    (syntax-rules ()
+		  ((push item list)
+		   (set! list (cons item list))))))
+
+(test '(set! foo (cons bar foo)) 'push (macro:expand '(push bar foo)))
+
+(macro:expand
+ '(define-syntax push1
+    (transformer
+     (lambda (exp env)
+       (let ((item
+	      (make-syntactic-closure env '() (cadr exp)))
+	     (list
+	      (make-syntactic-closure env '() (caddr exp))))
+	 `(set! ,list (cons ,item ,list)))))))
+
+(test '(set! foo (cons bar foo)) 'push1 (macro:expand '(push1 bar foo)))
+
+(macro:expand
+ '(define-syntax loop
+    (transformer
+     (lambda (exp env)
+       (let ((body (cdr exp)))
+	 `(call-with-current-continuation
+	   (lambda (exit)
+	     (let f ()
+	       ,@(map (lambda  (exp)
+			(make-syntactic-closure env '(exit)
+						exp))
+		      body)
+	       (f)))))))))
+
+(macro:expand
+ '(define-syntax let1
+    (transformer
+     (lambda (exp env)
+       (let ((id (cadr exp))
+	     (init (caddr exp))
+	     (exp (cadddr exp)))
+	 `((lambda (,id)
+	     ,(make-syntactic-closure env (list id) exp))
+	   ,(make-syntactic-closure env '() init)))))))
+
+(test 93 'let1 (macro:eval '(let1 a 90 (+ a 3))))
+
+(macro:expand
+ '(define-syntax loop-until
+    (syntax-rules
+     ()
+     ((loop-until id init test return step)
+      (letrec ((loop
+		(lambda (id)
+		  (if test return (loop step)))))
+	(loop init))))))
+
+(test (macro:expand '(letrec ((loop (lambda (foo) (if #t 12 (loop 33)))))
+		       (loop 3)))
+      'loop
+      (macro:expand '(loop-until foo 3 #t 12 33)))
+
+(macro:expand
+ '(define-syntax loop-until1
+    (transformer
+     (lambda (exp env)
+       (let ((id (cadr exp))
+	     (init (caddr exp))
+	     (test (cadddr exp))
+	     (return (cadddr (cdr exp)))
+	     (step (cadddr (cddr exp)))
+	     (close
+	      (lambda (exp free)
+		(make-syntactic-closure env free exp))))
+	 `(letrec ((loop
+		    ,(capture-syntactic-environment
+		      (lambda (env)
+			`(lambda (,id)
+			   (,(make-syntactic-closure env '() `if)
+			    ,(close test (list id))
+			    ,(close return (list id))
+			    (,(make-syntactic-closure env '()
+						      `loop)
+			     ,(close step (list id)))))))))
+	    (loop ,(close init '()))))))))
+
+(test (macro:expand '(letrec ((loop (lambda (foo) (if #t 12 (loop 33)))))
+			      (loop 3)))
+      'loop1
+      (macro:expand '(loop-until1 foo 3 #t 12 33)))
+
+(test '#t 'identifier (identifier? 'a))
+;;; this needs to setup ENV.
+;;;(test '#t 'identifier
+;;;      (identifier? (macro:expand (make-syntactic-closure env '() 'a))))
+(test #f 'identifier (identifier? "a"))
+(test #f 'identifier (identifier? #\a))
+(test #f 'identifier (identifier? 97))
+(test #f 'identifier (identifier? #f))
+(test #f 'identifier (identifier? '(a)))
+(test #f 'identifier (identifier? '#(a)))
+
+(test '(#t #f)
+      'syntax
+      (macro:eval
+       '(let-syntax
+	    ((foo
+	      (transformer
+	       (lambda (form env)
+		 (capture-syntactic-environment
+		  (lambda (transformer-env)
+		    (identifier=? transformer-env 'x env 'x)))))))
+	  (list (foo)
+		(let ((x 3))
+		  (foo))))))
+
+
+(test '(#f #t)
+      'syntax
+      (macro:eval
+       '(let-syntax ((bar foo))
+	  (let-syntax
+	      ((foo
+		(transformer
+		 (lambda (form env)
+		   (capture-syntactic-environment
+		    (lambda (transformer-env)
+		      (identifier=? transformer-env 'foo
+				    env (cadr form))))))))
+	    (list (foo foo)
+		  (foo bar))))))
+
+(newline)
+(cond ((null? errs) (display "Passed all tests"))
+      (else (display "errors were:") (newline)
+	    (display "(got expected (call))") (newline)
+	    (for-each (lambda (l) (write l) (newline)) errs)))
+(newline)