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Jeena Paradies
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PrintJavalette.hs
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199
PrintJavalette.hs
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{-# OPTIONS -fno-warn-incomplete-patterns #-}
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module PrintJavalette where
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-- pretty-printer generated by the BNF converter
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import AbsJavalette
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import Char
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-- the top-level printing method
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printTree :: Print a => a -> String
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printTree = render . prt 0
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type Doc = [ShowS] -> [ShowS]
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doc :: ShowS -> Doc
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doc = (:)
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render :: Doc -> String
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render d = rend 0 (map ($ "") $ d []) "" where
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rend i ss = case ss of
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"[" :ts -> showChar '[' . rend i ts
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"(" :ts -> showChar '(' . rend i ts
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"{" :ts -> showChar '{' . new (i+1) . rend (i+1) ts
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"}" : ";":ts -> new (i-1) . space "}" . showChar ';' . new (i-1) . rend (i-1) ts
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"}" :ts -> new (i-1) . showChar '}' . new (i-1) . rend (i-1) ts
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";" :ts -> showChar ';' . new i . rend i ts
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t : "," :ts -> showString t . space "," . rend i ts
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t : ")" :ts -> showString t . showChar ')' . rend i ts
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t : "]" :ts -> showString t . showChar ']' . rend i ts
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t :ts -> space t . rend i ts
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_ -> id
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new i = showChar '\n' . replicateS (2*i) (showChar ' ') . dropWhile isSpace
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space t = showString t . (\s -> if null s then "" else (' ':s))
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parenth :: Doc -> Doc
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parenth ss = doc (showChar '(') . ss . doc (showChar ')')
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concatS :: [ShowS] -> ShowS
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concatS = foldr (.) id
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concatD :: [Doc] -> Doc
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concatD = foldr (.) id
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replicateS :: Int -> ShowS -> ShowS
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replicateS n f = concatS (replicate n f)
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-- the printer class does the job
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class Print a where
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prt :: Int -> a -> Doc
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prtList :: [a] -> Doc
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prtList = concatD . map (prt 0)
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instance Print a => Print [a] where
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prt _ = prtList
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instance Print Char where
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prt _ s = doc (showChar '\'' . mkEsc '\'' s . showChar '\'')
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prtList s = doc (showChar '"' . concatS (map (mkEsc '"') s) . showChar '"')
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mkEsc :: Char -> Char -> ShowS
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mkEsc q s = case s of
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_ | s == q -> showChar '\\' . showChar s
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'\\'-> showString "\\\\"
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'\n' -> showString "\\n"
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'\t' -> showString "\\t"
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_ -> showChar s
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prPrec :: Int -> Int -> Doc -> Doc
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prPrec i j = if j<i then parenth else id
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instance Print Integer where
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prt _ x = doc (shows x)
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instance Print Double where
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prt _ x = doc (shows x)
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instance Print Ident where
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prt _ (Ident i) = doc (showString i)
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instance Print Program where
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prt i e = case e of
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Program topdefs -> prPrec i 0 (concatD [prt 0 topdefs])
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instance Print TopDef where
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prt i e = case e of
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FnDef type' id args block -> prPrec i 0 (concatD [prt 0 type' , prt 0 id , doc (showString "(") , prt 0 args , doc (showString ")") , prt 0 block])
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prtList es = case es of
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[x] -> (concatD [prt 0 x])
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x:xs -> (concatD [prt 0 x , prt 0 xs])
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instance Print Arg where
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prt i e = case e of
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Arg type' id -> prPrec i 0 (concatD [prt 0 type' , prt 0 id])
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prtList es = case es of
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[] -> (concatD [])
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[x] -> (concatD [prt 0 x])
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x:xs -> (concatD [prt 0 x , doc (showString ",") , prt 0 xs])
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instance Print Block where
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prt i e = case e of
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Block stmts -> prPrec i 0 (concatD [doc (showString "{") , prt 0 stmts , doc (showString "}")])
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instance Print Stmt where
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prt i e = case e of
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Empty -> prPrec i 0 (concatD [doc (showString ";")])
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BStmt block -> prPrec i 0 (concatD [prt 0 block])
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Decl type' items -> prPrec i 0 (concatD [prt 0 type' , prt 0 items , doc (showString ";")])
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Ass id expr -> prPrec i 0 (concatD [prt 0 id , doc (showString "=") , prt 0 expr , doc (showString ";")])
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Incr id -> prPrec i 0 (concatD [prt 0 id , doc (showString "++") , doc (showString ";")])
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Decr id -> prPrec i 0 (concatD [prt 0 id , doc (showString "--") , doc (showString ";")])
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Ret expr -> prPrec i 0 (concatD [doc (showString "return") , prt 0 expr , doc (showString ";")])
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VRet -> prPrec i 0 (concatD [doc (showString "return") , doc (showString ";")])
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Cond expr stmt -> prPrec i 0 (concatD [doc (showString "if") , doc (showString "(") , prt 0 expr , doc (showString ")") , prt 0 stmt])
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CondElse expr stmt0 stmt -> prPrec i 0 (concatD [doc (showString "if") , doc (showString "(") , prt 0 expr , doc (showString ")") , prt 0 stmt0 , doc (showString "else") , prt 0 stmt])
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While expr stmt -> prPrec i 0 (concatD [doc (showString "while") , doc (showString "(") , prt 0 expr , doc (showString ")") , prt 0 stmt])
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SExp expr -> prPrec i 0 (concatD [prt 0 expr , doc (showString ";")])
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prtList es = case es of
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[] -> (concatD [])
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x:xs -> (concatD [prt 0 x , prt 0 xs])
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instance Print Item where
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prt i e = case e of
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NoInit id -> prPrec i 0 (concatD [prt 0 id])
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Init id expr -> prPrec i 0 (concatD [prt 0 id , doc (showString "=") , prt 0 expr])
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prtList es = case es of
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[x] -> (concatD [prt 0 x])
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x:xs -> (concatD [prt 0 x , doc (showString ",") , prt 0 xs])
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instance Print Type where
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prt i e = case e of
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Int -> prPrec i 0 (concatD [doc (showString "int")])
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Doub -> prPrec i 0 (concatD [doc (showString "double")])
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Bool -> prPrec i 0 (concatD [doc (showString "boolean")])
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Void -> prPrec i 0 (concatD [doc (showString "void")])
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Fun type' types -> prPrec i 0 (concatD [prt 0 type' , doc (showString "(") , prt 0 types , doc (showString ")")])
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prtList es = case es of
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[] -> (concatD [])
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[x] -> (concatD [prt 0 x])
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x:xs -> (concatD [prt 0 x , doc (showString ",") , prt 0 xs])
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instance Print Expr where
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prt i e = case e of
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EVar id -> prPrec i 6 (concatD [prt 0 id])
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ELitInt n -> prPrec i 6 (concatD [prt 0 n])
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ELitDoub d -> prPrec i 6 (concatD [prt 0 d])
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ELitTrue -> prPrec i 6 (concatD [doc (showString "true")])
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ELitFalse -> prPrec i 6 (concatD [doc (showString "false")])
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EApp id exprs -> prPrec i 6 (concatD [prt 0 id , doc (showString "(") , prt 0 exprs , doc (showString ")")])
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EString str -> prPrec i 6 (concatD [prt 0 str])
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Neg expr -> prPrec i 5 (concatD [doc (showString "-") , prt 6 expr])
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Not expr -> prPrec i 5 (concatD [doc (showString "!") , prt 6 expr])
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EMul expr0 mulop expr -> prPrec i 4 (concatD [prt 4 expr0 , prt 0 mulop , prt 5 expr])
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EAdd expr0 addop expr -> prPrec i 3 (concatD [prt 3 expr0 , prt 0 addop , prt 4 expr])
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ERel expr0 relop expr -> prPrec i 2 (concatD [prt 2 expr0 , prt 0 relop , prt 3 expr])
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EAnd expr0 expr -> prPrec i 1 (concatD [prt 2 expr0 , doc (showString "&&") , prt 1 expr])
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EOr expr0 expr -> prPrec i 0 (concatD [prt 1 expr0 , doc (showString "||") , prt 0 expr])
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TAnot type' expr -> prPrec i 0 (concatD [doc (showString "<") , prt 0 type' , doc (showString ">") , doc (showString "(") , prt 0 expr , doc (showString ")")])
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prtList es = case es of
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[] -> (concatD [])
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[x] -> (concatD [prt 0 x])
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x:xs -> (concatD [prt 0 x , doc (showString ",") , prt 0 xs])
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instance Print AddOp where
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prt i e = case e of
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Plus -> prPrec i 0 (concatD [doc (showString "+")])
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Minus -> prPrec i 0 (concatD [doc (showString "-")])
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instance Print MulOp where
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prt i e = case e of
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Times -> prPrec i 0 (concatD [doc (showString "*")])
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Div -> prPrec i 0 (concatD [doc (showString "/")])
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Mod -> prPrec i 0 (concatD [doc (showString "%")])
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instance Print RelOp where
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prt i e = case e of
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LTH -> prPrec i 0 (concatD [doc (showString "<")])
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LE -> prPrec i 0 (concatD [doc (showString "<=")])
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GTH -> prPrec i 0 (concatD [doc (showString ">")])
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GE -> prPrec i 0 (concatD [doc (showString ">=")])
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EQU -> prPrec i 0 (concatD [doc (showString "==")])
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NE -> prPrec i 0 (concatD [doc (showString "!=")])
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