1 files changed, 44 insertions, 0 deletions
diff --git a/test/cond.scm b/test/cond.scm
new file mode 100644
index 0000000..6151ef2
--- /dev/null
+++ b/test/cond.scm
@@ -0,0 +1,44 @@
+(define-syntax let
+  (syntax-rules ()
+    ((let ((name val) ...) body1 body2 ...)
+     ((lambda (name ...) body1 body2 ...)
+      val ...))))
+
+(define-syntax begin
+  (syntax-rules ()
+    ((begin exp ...)
+     ((lambda () exp ...)))))
+
+(define-syntax cond
+  (syntax-rules (else =>)
+    ((cond (else result1 result2 ...))
+     (begin result1 result2 ...))
+    ((cond (test => result))
+     (let ((temp test))
+       (if temp (result temp))))
+    ((cond (test => result) clause1 clause2 ...)
+     (let ((temp test))
+       (if temp
+           (result temp)
+           (cond clause1 clause2 ...))))
+    ((cond (test)) test)
+    ((cond (test) clause1 clause2 ...)
+     (let ((temp test))
+       (if temp
+           temp
+           (cond clause1 clause2 ...))))
+    ((cond (test result1 result2 ...))
+     (if test (begin result1 result2 ...)))
+    ((cond (test result1 result2 ...)
+           clause1 clause2 ...)
+     (if test
+         (begin result1 result2 ...)
+         (cond clause1 clause2 ...)))))
+
+(define x 2)
+
+(cond
+ ((= x 1) 1.0)
+ ((= x 2) 2.0)
+ ((= x 3) 3.0)
+ (else 42.0))