--- /dev/null
+module Printer where
+
+import Pretty
+import Core
+import Char
+import Numeric (fromRat)
+
+instance Show Module where
+ showsPrec d m = shows (pmodule m)
+
+instance Show Tdef where
+ showsPrec d t = shows (ptdef t)
+
+instance Show Cdef where
+ showsPrec d c = shows (pcdef c)
+
+instance Show Vdefg where
+ showsPrec d v = shows (pvdefg v)
+
+instance Show Vdef where
+ showsPrec d v = shows (pvdef v)
+
+instance Show Exp where
+ showsPrec d e = shows (pexp e)
+
+instance Show Alt where
+ showsPrec d a = shows (palt a)
+
+instance Show Ty where
+ showsPrec d t = shows (pty t)
+
+instance Show Kind where
+ showsPrec d k = shows (pkind k)
+
+instance Show Lit where
+ showsPrec d l = shows (plit l)
+
+
+indent = nest 2
+
+pmodule (Module mname tdefs vdefgs) =
+ (text "%module" <+> text mname)
+ $$ indent ((vcat (map ((<> char ';') . ptdef) tdefs))
+ $$ (vcat (map ((<> char ';') . pvdefg) vdefgs)))
+
+ptdef (Data qtcon tbinds cdefs) =
+ (text "%data" <+> pqname qtcon <+> (hsep (map ptbind tbinds)) <+> char '=')
+ $$ indent (braces ((vcat (punctuate (char ';') (map pcdef cdefs)))))
+
+ptdef (Newtype qtcon tbinds tyopt ) =
+ text "%newtype" <+> pqname qtcon <+> (hsep (map ptbind tbinds)) <+>
+ (case tyopt of
+ Just ty -> char '=' <+> pty ty
+ Nothing -> empty)
+
+pcdef (Constr qdcon tbinds tys) =
+ (pqname qdcon) <+> (sep [hsep (map pattbind tbinds),sep (map paty tys)])
+
+pname id = text id
+
+pqname ("",id) = pname id
+pqname (m,id) = pname m <> char '.' <> pname id
+
+ptbind (t,Klifted) = pname t
+ptbind (t,k) = parens (pname t <> text "::" <> pkind k)
+
+pattbind (t,k) = char '@' <> ptbind (t,k)
+
+pakind (Klifted) = char '*'
+pakind (Kunlifted) = char '#'
+pakind (Kopen) = char '?'
+pakind k = parens (pkind k)
+
+pkind (Karrow k1 k2) = parens (pakind k1 <> text "->" <> pkind k2)
+pkind k = pakind k
+
+paty (Tvar n) = pname n
+paty (Tcon c) = pqname c
+paty t = parens (pty t)
+
+pbty (Tapp(Tapp(Tcon tc) t1) t2) | tc == tcArrow = parens(fsep [pbty t1, text "->",pty t2])
+pbty (Tapp t1 t2) = pappty t1 [t2]
+pbty t = paty t
+
+pty (Tapp(Tapp(Tcon tc) t1) t2) | tc == tcArrow = fsep [pbty t1, text "->",pty t2]
+pty (Tforall tb t) = text "%forall" <+> pforall [tb] t
+pty t = pbty t
+
+pappty (Tapp t1 t2) ts = pappty t1 (t2:ts)
+pappty t ts = sep (map paty (t:ts))
+
+pforall tbs (Tforall tb t) = pforall (tbs ++ [tb]) t
+pforall tbs t = hsep (map ptbind tbs) <+> char '.' <+> pty t
+
+pvdefg (Rec vdefs) = text "%rec" $$ 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 e) = paexp e
+ pa (Right t) = char '@' <+> paty t
+
+pexp (Lam b e) = char '\\' <+> plamexp [b] e
+pexp (Let vd e) = (text "%let" <+> pvdefg vd) $$ (text "%in" <+> pexp e)
+pexp (Case e vb alts) = sep [text "%case" <+> paexp e,
+ text "%of" <+> pvbind vb]
+ $$ (indent (braces (vcat (punctuate (char ';') (map palt alts)))))
+pexp (Coerce t e) = (text "%coerce" <+> paty t) $$ pexp e
+pexp (Note s e) = (text "%note" <+> pstring s) $$ pexp e
+pexp (External n t) = (text "%extcall" <+> 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 (Lint i t) = parens (integer i <> text "::" <> pty t)
+plit (Lrational r t) = parens (text (show (fromRat r)) <> text "::" <> pty t)
+plit (Lchar c t) = parens (text ("\'" ++ escape [c] ++ "\'") <> text "::" <> pty t)
+plit (Lstring s t) = parens (pstring s <> text "::" <> pty t)
+
+pstring s = doubleQuotes(text (escape s))
+
+escape s = foldr f [] (map ord s)
+ where
+ f cv 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
+ f cv rest = (chr cv):rest
+
projects / ghc-hetmet.git / blobdiff