\begin{code}
module PprExternalCore () where
-import Pretty
import ExternalCore
-import Char
import Encoding
+import Pretty
+import Char
+
+
instance Show Module where
- showsPrec d m = shows (pmodule m)
+ showsPrec _ m = shows (pmodule m)
instance Show Tdef where
- showsPrec d t = shows (ptdef t)
+ showsPrec _ t = shows (ptdef t)
instance Show Cdef where
- showsPrec d c = shows (pcdef c)
+ showsPrec _ c = shows (pcdef c)
instance Show Vdefg where
- showsPrec d v = shows (pvdefg v)
+ showsPrec _ v = shows (pvdefg v)
instance Show Exp where
- showsPrec d e = shows (pexp e)
+ showsPrec _ e = shows (pexp e)
instance Show Alt where
- showsPrec d a = shows (palt a)
+ showsPrec _ a = shows (palt a)
instance Show Ty where
- showsPrec d t = shows (pty t)
+ showsPrec _ t = shows (pty t)
instance Show Kind where
- showsPrec d k = shows (pkind k)
+ showsPrec _ k = shows (pkind k)
instance Show Lit where
- showsPrec d l = shows (plit l)
+ showsPrec _ l = shows (plit l)
+indent :: Doc -> Doc
indent = nest 2
+pmodule :: Module -> Doc
pmodule (Module mname tdefs vdefgs) =
(text "%module" <+> text mname)
$$ indent ((vcat (map ((<> char ';') . ptdef) tdefs))
$$ (vcat (map ((<> char ';') . pvdefg) vdefgs)))
+ptdef :: Tdef -> Doc
ptdef (Data tcon tbinds cdefs) =
(text "%data" <+> pqname tcon <+> (hsep (map ptbind tbinds)) <+> char '=')
$$ indent (braces ((vcat (punctuate (char ';') (map pcdef cdefs)))))
-ptdef (Newtype tcon tbinds rep ) =
- text "%newtype" <+> pqname tcon <+> (hsep (map ptbind tbinds)) <+> repclause
+ptdef (Newtype tcon coercion tbinds rep) =
+ text "%newtype" <+> pqname tcon <+> pqname coercion
+ <+> (hsep (map ptbind tbinds)) $$ indent repclause
where repclause = case rep of
Just ty -> char '=' <+> pty ty
Nothing -> empty
+
+pcdef :: Cdef -> Doc
pcdef (Constr dcon tbinds tys) =
- (pname dcon) <+> (sep [hsep (map pattbind tbinds),sep (map paty tys)])
+ (pqname dcon) <+> (sep [hsep (map pattbind tbinds),sep (map paty tys)])
pcdef (GadtConstr dcon ty) =
- (pname dcon) <+> text "::" <+> pty ty
+ (pqname dcon) <+> text "::" <+> pty ty
+pname :: Id -> Doc
pname id = text (zEncodeString id)
+pqname :: Qual Id -> Doc
pqname ("",id) = pname id
pqname (m,id) = text m <> char '.' <> pname id
+ptbind, pattbind :: Tbind -> Doc
ptbind (t,Klifted) = pname t
ptbind (t,k) = parens (pname t <> text "::" <> pkind k)
pattbind (t,k) = char '@' <> ptbind (t,k)
+pakind, pkind :: Kind -> Doc
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 t1 t2) = parens (parens (pty t1) <+> text ":=:" <+>
+ parens (pty t2))
pkind k = pakind k
+paty, pbty, pty :: Ty -> Doc
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 (Tapp t1 t2) = parens $ 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 :: Ty -> [Ty] -> Doc
pappty (Tapp t1 t2) ts = pappty t1 (t2:ts)
pappty t ts = sep (map paty (t:ts))
+pforall :: [Tbind] -> Ty -> Doc
pforall tbs (Tforall tb t) = pforall (tbs ++ [tb]) t
pforall tbs t = hsep (map ptbind tbs) <+> char '.' <+> pty t
+pvdefg :: Vdefg -> Doc
pvdefg (Rec vdefs) = text "%rec" $$ braces (indent (vcat (punctuate (char ';') (map pvdef vdefs))))
pvdefg (Nonrec vdef) = pvdef vdef
-pvdef (l,v,t,e) = sep [plocal l <+> pname v <+> text "::" <+> pty t <+> char '=',
+pvdef :: Vdef -> Doc
+-- TODO: Think about whether %local annotations are actually needed.
+-- Right now, the local flag is never used, because the Core doc doesn't
+-- explain the meaning of %local.
+pvdef (_l,v,t,e) = sep [(pqname v <+> text "::" <+> pty t <+> char '='),
indent (pexp e)]
-plocal True = text "%local"
-plocal False = empty
-
+paexp, pfexp, pexp :: Exp -> Doc
paexp (Var x) = pqname x
paexp (Dcon x) = pqname x
paexp (Lit l) = plit l
paexp e = parens(pexp e)
+plamexp :: [Bind] -> Exp -> Doc
plamexp bs (Lam b e) = plamexp (bs ++ [b]) e
plamexp bs e = sep [sep (map pbind bs) <+> text "->",
indent (pexp e)]
+pbind :: Bind -> Doc
pbind (Tb tb) = char '@' <+> ptbind tb
pbind (Vb vb) = pvbind vb
pfexp (Appt e t) = pappexp e [Right t]
pfexp e = paexp e
+pappexp :: Exp -> [Either Exp Ty] -> Doc
pappexp (App e1 e2) as = pappexp e1 (Left e2:as)
pappexp (Appt e t) as = pappexp e (Right t:as)
pappexp e as = fsep (paexp e : map pa as)
pexp (Lam b e) = char '\\' <+> plamexp [b] e
pexp (Let vd e) = (text "%let" <+> pvdefg vd) $$ (text "%in" <+> pexp e)
-pexp (Case e vb ty alts) = sep [text "%case" <+> parens (paty ty) <+> paexp e,
+pexp (Case e vb ty alts) = sep [text "%case" <+> paty ty <+> paexp e,
text "%of" <+> pvbind vb]
$$ (indent (braces (vcat (punctuate (char ';') (map palt alts)))))
-pexp (Cast e co) = (text "%cast" <+> pexp e) $$ paty co
+pexp (Cast e co) = (text "%cast" <+> parens (pexp e)) $$ paty co
pexp (Note s e) = (text "%note" <+> pstring s) $$ pexp e
-pexp (External n t) = (text "%external" <+> pstring n) $$ paty t
+pexp (External n cc t) = (text "%external" <+> text cc <+> pstring n) $$ paty t
+pexp (DynExternal cc t) = (text "%dynexternal" <+> text cc) $$ paty t
+pexp (Label n) = (text "%label" <+> pstring n)
pexp e = pfexp e
-
+pvbind :: Vbind -> Doc
pvbind (x,t) = parens(pname x <> text "::" <> pty t)
+palt :: Alt -> Doc
palt (Acon c tbs vbs e) =
sep [pqname c,
sep (map pattbind tbs),
(text "%_ ->")
$$ indent (pexp e)
+plit :: Lit -> Doc
plit (Lint i t) = parens (integer i <> text "::" <> pty t)
-plit (Lrational r t) = parens (rational r <> text "::" <> pty t) -- might be better to print as two integers
+-- we use (text (show r)) because "(rational r)" was printing out things
+-- like "2.0e-2" (which isn't External Core)
+plit (Lrational r t) = parens (text (show 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 :: String -> Doc
pstring s = doubleQuotes(text (escape s))
+escape :: String -> String
escape s = foldr f [] (map ord s)
where
f cv rest
projects / ghc-hetmet.git / blobdiff