calculator.shen in shen-ruby-0.11.0

- old
+ new

@@ -1,21 +1,21 @@
-(datatype arith-expr
-
-    X : number;
-    ====================
-    [num X] : arith-expr; 
-
-    if (element? Op [+ - * /])
-    X : arith-expr; Y : arith-expr;
-    ===============================
-    [X Op Y] : arith-expr;)
-
-(define do-calculation
-  {arith-expr --> number}
-  [X + Y] -> (+ (do-calculation X) (do-calculation Y))
-  [X - Y] -> (- (do-calculation X) (do-calculation Y))
-  [X * Y] -> (* (do-calculation X) (do-calculation Y))
-  [X / Y] -> (/ (do-calculation X) (do-calculation Y))
-  [num X] -> X)
-
-
-
+(datatype arith-expr
+
+    X : number;
+    ====================
+    [num X] : arith-expr; 
+
+    if (element? Op [+ - * /])
+    X : arith-expr; Y : arith-expr;
+    ===============================
+    [X Op Y] : arith-expr;)
+
+(define do-calculation
+  {arith-expr --> number}
+  [X + Y] -> (+ (do-calculation X) (do-calculation Y))
+  [X - Y] -> (- (do-calculation X) (do-calculation Y))
+  [X * Y] -> (* (do-calculation X) (do-calculation Y))
+  [X / Y] -> (/ (do-calculation X) (do-calculation Y))
+  [num X] -> X)
+
+
+