Add AST to Parser

app/Parser.hs

@@ -0,0 +1,20 @@
+module Parser where
+
+import qualified Lexer
+
+type AST = Expr
+
+data Expr = Add Term Expr
+          | Sub Term Expr
+          | ETerm Term
+          deriving Show
+
+data Term = Mult Factor Term
+          | Div Factor Term
+          | TFactor Factor
+          deriving Show
+
+data Factor = Integer Int
+            | Parantheses Expr
+            | NegFactor Factor
+            deriving Show

simple-arithmetic-compiler.cabal

@@ -52,7 +52,7 @@ executable simple-arithmetic-compiler
     main-is:          Main.hs
 
     -- Modules included in this executable, other than Main.
-    other-modules:    Lexer
+    other-modules:    Lexer, Parser
 
     -- LANGUAGE extensions used by modules in this package.
     -- other-extensions: