added arithmetic.grammar

git-svn-id: svn://anubis/gvsu@109 45c1a28c-8058-47b2-ae61-ca45b979098e

cs675/bottomup/arithmetic.grammar

@@ -0,0 +1,29 @@
+
+Package jholtrop.gvsu.cs675.bottomup;
+
+Tokens
+    blank = (' ' | 9 | 10 | 13);
+    number = ['0' .. '9']+ ('.' ['0' .. '9']+)?;
+    plus = '+';
+    minus = '-';
+    multiply = '*';
+    divide = '/';
+    l_par = '(';
+    r_par = ')';
+
+Ignored Tokens
+    blank;
+
+Productions
+    expr =
+        {addition} expr plus term |
+        {subtraction} expr minus term |
+        {term} term;
+
+    term =
+        {multiplication} term multiply factor |
+        {division} term divide factor;
+
+    factor =
+        {number} number |
+        {paren} l_par expr r_par;