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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
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