--- /dev/null
+{-# OPTIONS -Werror -Wall -fno-warn-missing-signatures #-}
+
+module Language.Core.Printer where
+
+import Text.PrettyPrint.HughesPJ
+import Data.Char
+
+import Language.Core.Core
+import Language.Core.Encoding
+import Language.Core.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 "<K" <+> pkind k <> text ">")
+ showsPrec _ (Coercion (DefinedCoercion tbs (t1,t2))) =
+ shows (text "<C" <+> 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 '=')
+ $$ indent (braces ((vcat (punctuate (char ';') (map pcdef cdefs)))))
+
+ptdef (Newtype qtcon coercion tbinds tyopt) =
+ text "%newtype" <+> pqname qtcon <+> pqname coercion
+ <+> (hsep (map ptbind tbinds)) $$ indent repclause
+ where repclause = char '=' <+> pty tyopt
+
+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 (P 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
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