1 files changed, 68 insertions, 0 deletions
diff --git a/src/HSVIS/AST.hs b/src/HSVIS/AST.hs
new file mode 100644
index 0000000..5a90205
--- /dev/null
+++ b/src/HSVIS/AST.hs
@@ -0,0 +1,68 @@
+module HSVIS.AST where
+
+import Data.List.NonEmpty (NonEmpty)
+
+import HSVIS.Pretty
+
+
+newtype Name = Name String
+  deriving (Show, Eq)
+
+data Program t = Program [DataDef] [FunDef t]
+  deriving (Show)
+
+data DataDef = DataDef Name [Name] [(Name, [Type])]
+  deriving (Show)
+
+data FunDef t = FunDef Name (Maybe Type) (NonEmpty (FunEq t))
+  deriving (Show)
+
+data FunEq t = FunEq Name [Pattern t] (RHS t)
+  deriving (Show)
+
+data Type
+  = TApp Type [Type]
+  | TTup [Type]
+  | TList Type
+  | TFun Type Type
+  | TCon Name
+  | TVar Name
+  deriving (Show)
+
+data Pattern t
+  = PWildcard t
+  | PVar t Name
+  | PAs t Name (Pattern t)
+  | PCon t Name [Pattern t]
+  | POp t (Pattern t) Operator (Pattern t)
+  | PList t [Pattern t]
+  | PTup t [Pattern t]
+  deriving (Show)
+
+data RHS t
+  = Guarded [(Expr t, Expr t)]  -- currently not parsed
+  | Plain (Expr t)
+  deriving (Show)
+
+data Expr t
+  = ELit t Literal
+  | EVar t Name
+  | ECon t Name
+  | 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 Integer | LFloat Rational | LChar Char | LString String
+  deriving (Show)
+
+data Operator = OAdd | OSub | OMul | ODiv | OMod | OEqu | OPow
+              | OCons
+  deriving (Show)
+
+instance Pretty Name where
+  prettysPrec _ (Name n) = showString ("\"" ++ n ++ "\"")