{-# OPTIONS -Werror -Wall -fno-warn-missing-signatures #-} module Printer where import Text.PrettyPrint.HughesPJ import Char import Core import Encoding import PrimCoercions instance Show Module where showsPrec _ m = shows (pmodule m) instance Show Tdef where showsPrec _ t = shows (ptdef t) instance Show Cdef where showsPrec _ c = shows (pcdef c) instance Show Vdefg where showsPrec _ v = shows (pvdefg v) instance Show Vdef where showsPrec _ v = shows (pvdef v) instance Show Exp where showsPrec _ e = shows (pexp e) instance Show Alt where showsPrec _ a = shows (palt a) instance Show Ty where showsPrec _ t = shows (pty t) instance Show Kind where showsPrec _ k = shows (pkind k) instance Show Lit where showsPrec _ l = shows (plit l) instance Show CoreLit where showsPrec _ l = shows (pclit l) instance Show KindOrCoercion where showsPrec _ (Kind k) = shows (text " pkind k <> text ">") showsPrec _ (Coercion (DefinedCoercion tbs (t1,t2))) = shows (text " hsep (map ptbind tbs) <+> parens (pkind (Keq t1 t2)) <> text ">") instance Show AnMname where showsPrec _ mn = shows (panmname mn) indent = nest 2 -- seems like this is asking for a type class... pmodule (Module mname tdefs vdefgs) = (text "%module" <+> panmname mname) $$ indent ((vcat (map ((<> char ';') . ptdef) tdefs)) $$ (vcat (map ((<> char ';') . pvdefg) vdefgs))) <> (if ((not.null) tdefs) || ((not.null) vdefgs) then char '\n' else empty) -- add final newline; sigh. ptdef (Data qtcon tbinds cdefs) = (text "%data" <+> pqname qtcon <+> (hsep (map ptbind tbinds)) <+> char '=') $$ indent (braces ((vcat (punctuate (char ';') (map pcdef cdefs))))) ptdef (Newtype qtcon tbinds (coercion,cTbs,k) tyopt) = text "%newtype" <+> pqname qtcon <+> (hsep (map ptbind tbinds)) $$ indent (axiomclause $$ repclause) where axiomclause = char '^' <+> parens (pqname coercion <+> (hsep (map ptbind cTbs)) <+> text "::" <+> peqkind k) repclause = case tyopt of Just ty -> char '=' <+> pty ty Nothing -> empty pcdef (Constr qdcon tbinds tys) = (pqname qdcon) <+> (sep [hsep (map pattbind tbinds),sep (map paty tys)]) pname = text pqname (m,v) = pmname m <> pname v -- be sure to print the '.' here so we don't print out -- ".foo" for unqualified foo... pmname Nothing = empty pmname (Just m) = panmname m <> char '.' panmname (M (pkgName, parents, name)) = let parentStrs = map pname parents in pname pkgName <> char ':' <> -- This is to be sure to not print out: -- main:.Main for when there's a single module name -- with no parents. (case parentStrs of [] -> empty _ -> hcat (punctuate hierModuleSeparator (map pname parents)) <> hierModuleSeparator) <> pname name -- note that this is not a '.' but a Z-encoded '.': -- GHCziIOBase.IO, not GHC.IOBase.IO. -- What a pain. hierModuleSeparator = text (zEncodeString ".") ptbind (t,Klifted) = pname t ptbind (t,k) = parens (pname t <> text "::" <> pkind k) pattbind (t,k) = char '@' <> ptbind (t,k) pakind (Klifted) = char '*' pakind (Kunlifted) = char '#' pakind (Kopen) = char '?' pakind k = parens (pkind k) pkind (Karrow k1 k2) = parens (pakind k1 <> text "->" <> pkind k2) pkind (Keq from to) = peqkind (from,to) pkind k = pakind k peqkind (t1, t2) = parens (parens (pty t1) <+> text ":=:" <+> parens (pty t2)) paty (Tvar n) = pname n paty (Tcon c) = pqname c paty t = parens (pty t) pbty (Tapp(Tapp(Tcon tc) t1) t2) | tc == tcArrow = parens(fsep [pbty t1, text "->",pty t2]) pbty (Tapp t1 t2) = pappty t1 [t2] pbty t = paty t pty (Tapp(Tapp(Tcon tc) t1) t2) | tc == tcArrow = fsep [pbty t1, text "->",pty t2] pty (Tforall tb t) = text "%forall" <+> pforall [tb] t pty (TransCoercion t1 t2) = (sep ([pqname transCoercion, paty t1, paty t2])) pty (SymCoercion t) = (sep [pqname symCoercion, paty t]) pty (UnsafeCoercion t1 t2) = (sep [pqname unsafeCoercion, paty t1, paty t2]) pty (LeftCoercion t) = (pqname leftCoercion <+> paty t) pty (RightCoercion t) = (pqname rightCoercion <+> paty t) pty (InstCoercion t1 t2) = (sep [pqname instCoercion, paty t1, paty t2]) pty t = pbty t pappty (Tapp t1 t2) ts = pappty t1 (t2:ts) pappty t ts = sep (map paty (t:ts)) pforall tbs (Tforall tb t) = pforall (tbs ++ [tb]) t pforall tbs t = hsep (map ptbind tbs) <+> char '.' <+> pty t pvdefg (Rec vdefs) = text "%rec" $$ braces (indent (vcat (punctuate (char ';') (map pvdef vdefs)))) pvdefg (Nonrec vdef) = pvdef vdef pvdef (Vdef (qv,t,e)) = sep [pqname qv <+> text "::" <+> pty t <+> char '=', indent (pexp e)] paexp (Var x) = pqname x paexp (Dcon x) = pqname x paexp (Lit l) = plit l paexp e = parens(pexp e) plamexp bs (Lam b e) = plamexp (bs ++ [b]) e plamexp bs e = sep [sep (map pbind bs) <+> text "->", indent (pexp e)] pbind (Tb tb) = char '@' <+> ptbind tb pbind (Vb vb) = pvbind vb pfexp (App e1 e2) = pappexp e1 [Left e2] pfexp (Appt e t) = pappexp e [Right t] pfexp e = paexp e pappexp (App e1 e2) as = pappexp e1 (Left e2:as) pappexp (Appt e t) as = pappexp e (Right t:as) pappexp e as = fsep (paexp e : map pa as) where pa (Left ex) = paexp ex pa (Right t) = char '@' <+> paty t pexp (Lam b e) = char '\\' <+> plamexp [b] e pexp (Let vd e) = (text "%let" <+> pvdefg vd) $$ (text "%in" <+> pexp e) pexp (Case e vb t alts) = sep [text "%case" <+> paty t <+> paexp e, text "%of" <+> pvbind vb] $$ (indent (braces (vcat (punctuate (char ';') (map palt alts))))) pexp (Cast e t) = (text "%cast" <+> parens (pexp e)) $$ paty t pexp (Note s e) = (text "%note" <+> pstring s) $$ pexp e -- TODO: ccall shouldn't really be there pexp (External n t) = (text "%external ccall" <+> pstring n) $$ paty t pexp e = pfexp e pvbind (x,t) = parens(pname x <> text "::" <> pty t) palt (Acon c tbs vbs e) = sep [pqname c, sep (map pattbind tbs), sep (map pvbind vbs) <+> text "->"] $$ indent (pexp e) palt (Alit l e) = (plit l <+> text "->") $$ indent (pexp e) palt (Adefault e) = (text "%_ ->") $$ indent (pexp e) plit (Literal cl t) = parens (pclit cl <> text "::" <> pty t) pclit (Lint i) = integer i -- makes sure to print it out as n % d pclit (Lrational r) = text (show r) pclit (Lchar c) = text ("\'" ++ escape [c] ++ "\'") pclit (Lstring s) = pstring s pstring s = doubleQuotes(text (escape s)) escape :: String -> String escape s = foldr f [] (map ord s) where f cv rest | cv > 0xFF = '\\':'x':hs ++ rest | (cv < 0x20 || cv > 0x7e || cv == 0x22 || cv == 0x27 || cv == 0x5c) = '\\':'x':h1:h0:rest where (q1,r1) = quotRem cv 16 h1 = intToDigit q1 h0 = intToDigit r1 hs = dropWhile (=='0') $ reverse $ mkHex cv mkHex 0 = "" mkHex num = intToDigit r : mkHex q where (q,r) = quotRem num 16 f cv rest = (chr cv):rest