added some type checking stuff. vardecl now works for basictypes and unary operators

[cc1516.git] / AST.dcl

diff --git a/AST.dcl b/AST.dcl
index 9132067..ac1cf4e 100644 (file)
--- a/AST.dcl
+++ b/AST.dcl
@@ -3,16 +3,7 @@ definition module AST
 from Data.Maybe import :: Maybe
 from StdOverloaded import class toString
 
-/*
- * Type errors can happen in either 
- * - variable declarations (x :: Int = True)
- * - function declarations (f :: (Char -> Int) = (+)1)
- * - Expressions (1 + 'a')
- * So these are the items that will get position metadata
- */
-
 :: Pos = {line :: Int, col :: Int}
-
 :: AST = AST [VarDecl] [FunDecl]
 :: VarDecl = VarDecl Pos Type String Expr
 :: Type 
@@ -23,6 +14,8 @@ from StdOverloaded import class toString
        | BoolType
        | CharType
        | VarType
+    | VoidType
+    | (->>) infixl 7 Type Type
 :: Expr 
        = VarExpr Pos VarDef
        | Op2Expr Pos Expr Op2 Expr
@@ -38,9 +31,7 @@ from StdOverloaded import class toString
 :: Op1 = UnNegation | UnMinus
 :: Op2 = BiPlus | BiMinus | BiTimes | BiDivide | BiMod | BiEquals | BiLesser |
        BiGreater | BiLesserEq | BiGreaterEq | BiUnEqual | BiAnd | BiOr | BiCons
-
-:: FunDecl = FunDecl Pos String [String] (Maybe FunType) [VarDecl] [Stmt]
-:: FunType = FunType [Type] (Maybe Type)
+:: FunDecl = FunDecl Pos String [String] (Maybe Type) [VarDecl] [Stmt]
 :: FunCall = FunCall String [Expr]
 :: Stmt 
        = IfStmt Expr [Stmt] [Stmt]
@@ -50,3 +41,5 @@ from StdOverloaded import class toString
        | ReturnStmt (Maybe Expr)
 
 instance toString AST
+instance toString Type
+instance toString Pos