1 files changed, 52 insertions, 0 deletions
diff --git a/AST.hs b/AST.hs
new file mode 100644
index 0000000..f8f3624
--- /dev/null
+++ b/AST.hs
@@ -0,0 +1,52 @@
+module AST where
+
+
+data Program t = Program [FunDef t]
+  deriving (Show)
+
+data FunDef t = FunDef Name (Maybe Type) [FunEq t]
+  deriving (Show)
+
+newtype Name = Name String
+  deriving (Show)
+
+data Type
+    = TApp Name [Type]
+    | TTup [Type]
+    | TList Type
+    | TFun Type Type
+  deriving (Show)
+
+data FunEq t = FunEq Name [Pattern t] (RHS t)
+  deriving (Show)
+
+data Pattern t
+    = PWildcard t
+    | PVar t Name
+    | PAs t Name (Pattern t)
+    | PCon t Name [Pattern t]
+    | PList t [Pattern t]
+    | PTup t [Pattern t]
+  deriving (Show)
+
+data RHS t
+    = Guarded [(Expr t, Expr t)]
+    | Plain (Expr t)
+  deriving (Show)
+
+data Expr t
+    = ELit t Literal
+    | EList t [Expr t]
+    | ETup t [Expr t]
+    | EApp t (Expr t) (Expr t)
+    | EOp t (Expr t) Operator (Expr t)
+    | EIf t (Expr t) (Expr t) (Expr t)
+    | ECase t (Expr t) [(Pattern t, RHS t)]
+    | ELet t [FunDef t] (Expr t)
+  deriving (Show)
+
+data Literal = LInt Int | LFloat Double | LChar Char | LString String
+  deriving (Show)
+
+data Operator = OAdd | OSub | OMul | ODiv | OMod
+  deriving (Show)