cleaned up Calculator example

1 files changed, 27 insertions, 0 deletions

diff --git a/examples/tutorial/calculator/CalculatorE.gf b/examples/tutorial/calculator/CalculatorE.gf
new file mode 100644
index 000000000..f432d371a
--- /dev/null
+++ b/examples/tutorial/calculator/CalculatorE.gf
@@ -0,0 +1,27 @@
+--# -path=.:prelude
+
+concrete CalculatorE of Calculator = open Prelude in {
+
+  flags lexer=codevar ; unlexer=unwords ;
+
+  lincat 
+    Prog, Exp, Var = SS ;
+
+  lin
+    PEmpty = ss [] ;
+    PInit exp prog = ss ("initialize" ++ prog.$0 ++ "as" ++ exp.s ++ PAUSE ++ prog.s) ;
+    PAss vr exp prog = ss ("redefine" ++ vr.s ++ "as" ++ exp.s ++ PAUSE ++ prog.s) ;
+
+    EPlus  = infix "plus" ;
+    EMinus = infix "minus" ;
+    ETimes = infix "times" ;
+    EDiv   = infix ["divided by"] ;
+
+    EInt i = i ;
+    EVar x = x ;
+
+  oper
+    infix : Str -> SS -> SS -> SS = \op,x,y -> 
+      ss (x.s ++ op ++ y.s ++ PAUSE) ;
+    PAUSE = "PAUSE" ;
+}