+++ /dev/null
-%
-% (c) The University of Glasgow 2001
-%
-\begin{code}
-
-module PprExternalCore () where
-
-import Pretty
-import ExternalCore
-import Char
-
-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 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 tcon tbinds cdefs) =
- (text "%data" <+> pqname tcon <+> (hsep (map ptbind tbinds)) <+> char '=')
- $$ indent (braces ((vcat (punctuate (char ';') (map pcdef cdefs)))))
-
-ptdef (Newtype tcon tbinds rep ) =
- text "%newtype" <+> pqname tcon <+> (hsep (map ptbind tbinds)) <+> repclause
- where repclause = case rep of
- Just ty -> char '=' <+> pty ty
- Nothing -> empty
-
-pcdef (Constr dcon tbinds tys) =
- (pname dcon) <+> (sep [hsep (map pattbind tbinds),sep (map paty tys)])
-pcdef (GadtConstr dcon ty) =
- (pname dcon) <+> text "::" <+> pty ty
-
-pname id = text id
-
-pqname ("",id) = pname id
-pqname (m,id) = pname m <> char '.' <> pname id
-
-ptbind (t,Klifted) = pname t
-ptbind (t,k) = parens (pname t <> text "::" <> pkind k)
-
-pattbind (t,k) = char '@' <> ptbind (t,k)
-
-pakind (Klifted) = char '*'
-pakind (Kunlifted) = char '#'
-pakind (Kopen) = char '?'
-pakind k = parens (pkind k)
-
-pkind (Karrow k1 k2) = parens (pakind k1 <> text "->" <> pkind k2)
-pkind k = pakind k
-
-paty (Tvar n) = pname n
-paty (Tcon c) = pqname c
-paty t = parens (pty t)
-
-pbty (Tapp(Tapp(Tcon tc) t1) t2) | tc == tcArrow = parens(fsep [pbty t1, text "->",pty t2])
-pbty (Tapp t1 t2) = pappty t1 [t2]
-pbty t = paty t
-
-pty (Tapp(Tapp(Tcon tc) t1) t2) | tc == tcArrow = fsep [pbty t1, text "->",pty t2]
-pty (Tforall tb t) = text "%forall" <+> pforall [tb] t
-pty t = pbty t
-
-pappty (Tapp t1 t2) ts = pappty t1 (t2:ts)
-pappty t ts = sep (map paty (t:ts))
-
-pforall tbs (Tforall tb t) = pforall (tbs ++ [tb]) t
-pforall tbs t = hsep (map ptbind tbs) <+> char '.' <+> pty t
-
-pvdefg (Rec vtes) = text "%rec" $$ braces (indent (vcat (punctuate (char ';') (map pvte vtes))))
-pvdefg (Nonrec vte) = pvte vte
-
-pvte (v,t,e) = sep [pname v <+> 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) $$ (text "%in" <+> pexp e)
-pexp (Case e vb ty alts) = sep [text "%case" <+> parens (paty ty) <+> paexp e,
- text "%of" <+> pvbind vb]
- $$ (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 "%external" <+> 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 (rational r <> text "::" <> pty t) -- might be better to print as two integers
-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 > 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 cv = intToDigit r : mkHex q
- where (q,r) = quotRem cv 16
- f cv rest = (chr cv):rest
-
-\end{code}
-
-
-
-
projects / ghc-hetmet.git / blobdiff