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module AST where
import Data.List
import Defs
import Pretty
data Program = Program [DVar] [DFunc]
deriving (Show, Eq)
data DVar = DVar Type Name Expression
deriving (Show, Eq)
data DFunc = DFunc (Maybe Type) Name [(Type, Name)] Block
deriving (Show, Eq)
data Type
= TInt | TChar | TArr Type (Maybe Size)
deriving (Show, Eq)
data Block = Block [Statement]
deriving (Show, Eq)
data Statement
= SDecl Type Name Expression
| SAs AsExpression Expression
| SIf Expression Block Block
| SWhile Expression Block
| SReturn (Maybe Expression)
| SExpr Expression
deriving (Show, Eq)
data AsExpression
= AEVar Name (Maybe Type)
| AESubscript AsExpression Expression (Maybe Type)
deriving (Show, Eq)
data Expression
= EBin BinaryOp Expression Expression (Maybe Type)
| EUn UnaryOp Expression (Maybe Type)
| ELit Literal (Maybe Type)
| ESubscript Expression Expression (Maybe Type)
| ECast Type Expression
| ENew Type Expression
deriving (Show, Eq)
data BinaryOp
= BOAdd | BOSub | BOMul | BODiv | BOMod | BOPow
| BOAnd | BOOr
| BOEq | BONeq | BOGt | BOLt | BOGeq | BOLeq
deriving (Show, Eq)
data UnaryOp
= UONot | UONeg
deriving (Show, Eq)
data Literal
= LInt Integer
| LChar Char
| LVar Name
| LCall Name [Expression]
deriving (Show, Eq)
sizeof :: Type -> Size
sizeof TInt = 8
sizeof TChar = 1
sizeof (TArr _ _) = 8
instance Pretty Program where
prettyI i (Program vars funcs) =
concatMap (++ ("\n" ++ indent i)) $
map (prettyI i) vars ++ map (prettyI i) funcs
where
indent n = replicate (2*n) ' '
instance Pretty DVar where
prettyI i (DVar t n e) =
prettyI i t ++ " " ++ n ++ " := " ++ prettyI i e ++ ";"
instance Pretty DFunc where
prettyI i (DFunc mt n al b) =
"func" ++ maybe "" ((' ' :) . prettyI i) mt ++ " " ++ n ++ "(" ++
intercalate ","
(map (\(at,an) -> prettyI i at ++ " " ++ an) al) ++
") " ++ prettyI i b
instance Pretty Type where
prettyI _ TInt = "int"
prettyI _ TChar = "char"
prettyI _ (TArr t Nothing) = pretty t ++ "[]"
prettyI _ (TArr t (Just sz)) = pretty t ++ "[" ++ show sz ++ "]"
instance Pretty Block where
prettyI _ (Block []) = "{}"
prettyI i (Block l) =
"{" ++
concatMap (("\n" ++ indent (i+1)) ++) (map (prettyI (i+1)) l) ++
"\n" ++ indent i ++ "}"
where
indent n = replicate (2*n) ' '
instance Pretty Statement where
prettyI i (SDecl t n e) =
prettyI i t ++ " " ++ n ++ " := " ++ prettyI i e ++ ";"
prettyI i (SAs target e) =
prettyI i target ++ " = " ++ prettyI i e ++ ";"
prettyI i (SIf c b1 b2) =
"if " ++ prettyI i c ++ " " ++ prettyI i b1 ++ " else " ++ prettyI i b2
prettyI i (SWhile c b) =
"while " ++ prettyI i c ++ " " ++ prettyI i b
prettyI _ (SReturn Nothing) =
"return;"
prettyI i (SReturn (Just e)) =
"return " ++ prettyI i e ++ ";"
prettyI i (SExpr e) = prettyI i e ++ ";"
instance Pretty Expression where
prettyI i (EBin bo a b (Just t)) =
"(" ++ prettyI i (EBin bo a b Nothing) ++ " :: " ++ prettyI i t ++ ")"
prettyI i (EBin bo a b Nothing) =
"(" ++ prettyI i a ++ ") " ++ prettyI i bo ++
" (" ++ prettyI i b ++ ")"
prettyI i (EUn uo e (Just t)) =
"(" ++ prettyI i (EUn uo e Nothing) ++ " :: " ++ prettyI i t ++ ")"
prettyI i (EUn uo e Nothing) =
prettyI i uo ++ "(" ++ prettyI i e ++ ")"
prettyI i (ELit l (Just t)) =
"(" ++ prettyI i (ELit l Nothing) ++ " :: " ++ prettyI i t ++ ")"
prettyI i (ELit l Nothing) = prettyI i l
prettyI i (ESubscript a b (Just t)) =
"(" ++ prettyI i (ESubscript a b Nothing) ++ " :: " ++ prettyI i t ++ ")"
prettyI i (ESubscript a b Nothing) = "(" ++ prettyI i a ++ ")[" ++ prettyI i b ++ "]"
prettyI i (ECast t e) = prettyI i t ++ "(" ++ prettyI i e ++ ")"
prettyI i (ENew t e) = "new " ++ prettyI i t ++ "[" ++ prettyI i e ++ "]"
instance Pretty AsExpression where
prettyI i (AEVar n (Just t)) =
"(" ++ prettyI i (AEVar n Nothing) ++ " :: " ++ prettyI i t ++ ")"
prettyI _ (AEVar n Nothing) = n
prettyI i (AESubscript ae e (Just t)) =
"(" ++ prettyI i (AESubscript ae e Nothing) ++ " :: " ++ prettyI i t ++ ")"
prettyI i (AESubscript ae e Nothing) = prettyI i ae ++ "[" ++ prettyI i e ++ "]"
instance Pretty BinaryOp where
prettyI _ BOAdd = "+"
prettyI _ BOSub = "-"
prettyI _ BOMul = "*"
prettyI _ BODiv = "/"
prettyI _ BOPow = "**"
prettyI _ BOMod = "%"
prettyI _ BOAnd = "&&"
prettyI _ BOOr = "||"
prettyI _ BOEq = "=="
prettyI _ BONeq = "!="
prettyI _ BOGt = ">"
prettyI _ BOLt = "<"
prettyI _ BOGeq = ">="
prettyI _ BOLeq = "<="
instance Pretty UnaryOp where
prettyI _ UONot = "!"
prettyI _ UONeg = "-"
instance Pretty Literal where
prettyI _ (LInt n) = show n
prettyI _ (LChar c) = show c
prettyI _ (LVar n) = n
prettyI i (LCall n al) =
n ++ "(" ++ intercalate ", " (map (prettyI i) al) ++ ")"
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