1 {-# OPTIONS -Werror -Wall -fno-warn-missing-signatures #-}
3 module Language.Core.Printer where
5 import Text.PrettyPrint.HughesPJ
8 import Language.Core.Core
9 import Language.Core.Encoding
10 import Language.Core.PrimCoercions
12 instance Show Module where
13 showsPrec _ m = shows (pmodule m)
15 instance Show Tdef where
16 showsPrec _ t = shows (ptdef t)
18 instance Show Cdef where
19 showsPrec _ c = shows (pcdef c)
21 instance Show Vdefg where
22 showsPrec _ v = shows (pvdefg v)
24 instance Show Vdef where
25 showsPrec _ v = shows (pvdef v)
27 instance Show Exp where
28 showsPrec _ e = shows (pexp e)
30 instance Show Alt where
31 showsPrec _ a = shows (palt a)
33 instance Show Ty where
34 showsPrec _ t = shows (pty t)
36 instance Show Kind where
37 showsPrec _ k = shows (pkind k)
39 instance Show Lit where
40 showsPrec _ l = shows (plit l)
42 instance Show CoreLit where
43 showsPrec _ l = shows (pclit l)
45 instance Show KindOrCoercion where
46 showsPrec _ (Kind k) = shows (text "<K" <+> pkind k <> text ">")
47 showsPrec _ (Coercion (DefinedCoercion tbs (t1,t2))) =
48 shows (text "<C" <+> hsep (map ptbind tbs) <+>
49 parens (pkind (Keq t1 t2)) <> text ">")
51 instance Show AnMname where
52 showsPrec _ mn = shows (panmname mn)
56 -- seems like this is asking for a type class...
58 pmodule (Module mname tdefs vdefgs) =
59 (text "%module" <+> panmname mname)
60 $$ indent ((vcat (map ((<> char ';') . ptdef) tdefs))
61 $$ (vcat (map ((<> char ';') . pvdefg) vdefgs)))
62 <> (if ((not.null) tdefs) || ((not.null) vdefgs) then char '\n' else empty)
63 -- add final newline; sigh.
65 ptdef (Data qtcon tbinds cdefs) =
66 (text "%data" <+> pqname qtcon <+> (hsep (map ptbind tbinds)) <+> char '=')
67 $$ indent (braces ((vcat (punctuate (char ';') (map pcdef cdefs)))))
69 ptdef (Newtype qtcon coercion tbinds tyopt) =
70 text "%newtype" <+> pqname qtcon <+> pqname coercion
71 <+> (hsep (map ptbind tbinds)) $$ indent repclause
72 where repclause = char '=' <+> pty tyopt
74 pcdef (Constr qdcon tbinds tys) =
75 (pqname qdcon) <+> (sep [hsep (map pattbind tbinds),sep (map paty tys)])
79 pqname (m,v) = pmname m <> pname v
81 -- be sure to print the '.' here so we don't print out
82 -- ".foo" for unqualified foo...
83 pmname Nothing = empty
84 pmname (Just m) = panmname m <> char '.'
86 panmname (M (P pkgName, parents, name)) =
87 let parentStrs = map pname parents in
88 pname pkgName <> char ':' <>
89 -- This is to be sure to not print out:
90 -- main:.Main for when there's a single module name
94 _ -> hcat (punctuate hierModuleSeparator
96 <> hierModuleSeparator)
99 -- note that this is not a '.' but a Z-encoded '.':
100 -- GHCziIOBase.IO, not GHC.IOBase.IO.
102 hierModuleSeparator = text (zEncodeString ".")
104 ptbind (t,Klifted) = pname t
105 ptbind (t,k) = parens (pname t <> text "::" <> pkind k)
107 pattbind (t,k) = char '@' <> ptbind (t,k)
109 pakind (Klifted) = char '*'
110 pakind (Kunlifted) = char '#'
111 pakind (Kopen) = char '?'
112 pakind k = parens (pkind k)
114 pkind (Karrow k1 k2) = parens (pakind k1 <> text "->" <> pkind k2)
115 pkind (Keq from to) = peqkind (from,to)
118 peqkind (t1, t2) = parens (parens (pty t1) <+> text ":=:" <+> parens (pty t2))
120 paty (Tvar n) = pname n
121 paty (Tcon c) = pqname c
122 paty t = parens (pty t)
124 pbty (Tapp(Tapp(Tcon tc) t1) t2) | tc == tcArrow = parens(fsep [pbty t1, text "->",pty t2])
125 pbty (Tapp t1 t2) = pappty t1 [t2]
128 pty (Tapp(Tapp(Tcon tc) t1) t2) | tc == tcArrow = fsep [pbty t1, text "->",pty t2]
129 pty (Tforall tb t) = text "%forall" <+> pforall [tb] t
130 pty (TransCoercion t1 t2) =
131 (sep ([pqname transCoercion, paty t1, paty t2]))
132 pty (SymCoercion t) =
133 (sep [pqname symCoercion, paty t])
134 pty (UnsafeCoercion t1 t2) =
135 (sep [pqname unsafeCoercion, paty t1, paty t2])
136 pty (LeftCoercion t) =
137 (pqname leftCoercion <+> paty t)
138 pty (RightCoercion t) =
139 (pqname rightCoercion <+> paty t)
140 pty (InstCoercion t1 t2) =
141 (sep [pqname instCoercion, paty t1, paty t2])
144 pappty (Tapp t1 t2) ts = pappty t1 (t2:ts)
145 pappty t ts = sep (map paty (t:ts))
147 pforall tbs (Tforall tb t) = pforall (tbs ++ [tb]) t
148 pforall tbs t = hsep (map ptbind tbs) <+> char '.' <+> pty t
150 pvdefg (Rec vdefs) = text "%rec" $$ braces (indent (vcat (punctuate (char ';') (map pvdef vdefs))))
151 pvdefg (Nonrec vdef) = pvdef vdef
153 pvdef (Vdef (qv,t,e)) = sep [pqname qv <+> text "::" <+> pty t <+> char '=',
156 paexp (Var x) = pqname x
157 paexp (Dcon x) = pqname x
158 paexp (Lit l) = plit l
159 paexp e = parens(pexp e)
161 plamexp bs (Lam b e) = plamexp (bs ++ [b]) e
162 plamexp bs e = sep [sep (map pbind bs) <+> text "->",
165 pbind (Tb tb) = char '@' <+> ptbind tb
166 pbind (Vb vb) = pvbind vb
168 pfexp (App e1 e2) = pappexp e1 [Left e2]
169 pfexp (Appt e t) = pappexp e [Right t]
172 pappexp (App e1 e2) as = pappexp e1 (Left e2:as)
173 pappexp (Appt e t) as = pappexp e (Right t:as)
174 pappexp e as = fsep (paexp e : map pa as)
175 where pa (Left ex) = paexp ex
176 pa (Right t) = char '@' <+> paty t
178 pexp (Lam b e) = char '\\' <+> plamexp [b] e
179 pexp (Let vd e) = (text "%let" <+> pvdefg vd) $$ (text "%in" <+> pexp e)
180 pexp (Case e vb t alts) = sep [text "%case" <+> paty t <+> paexp e,
181 text "%of" <+> pvbind vb]
182 $$ (indent (braces (vcat (punctuate (char ';') (map palt alts)))))
183 pexp (Cast e t) = (text "%cast" <+> parens (pexp e)) $$ paty t
184 pexp (Note s e) = (text "%note" <+> pstring s) $$ pexp e
185 -- TODO: ccall shouldn't really be there
186 pexp (External n t) = (text "%external ccall" <+> pstring n) $$ paty t
190 pvbind (x,t) = parens(pname x <> text "::" <> pty t)
192 palt (Acon c tbs vbs e) =
194 sep (map pattbind tbs),
195 sep (map pvbind vbs) <+> text "->"]
198 (plit l <+> text "->")
204 plit (Literal cl t) = parens (pclit cl <> text "::" <> pty t)
206 pclit (Lint i) = integer i
207 -- makes sure to print it out as n % d
208 pclit (Lrational r) = text (show r)
209 pclit (Lchar c) = text ("\'" ++ escape [c] ++ "\'")
210 pclit (Lstring s) = pstring s
212 pstring s = doubleQuotes(text (escape s))
214 escape :: String -> String
215 escape s = foldr f [] (map ord s)
218 | cv > 0xFF = '\\':'x':hs ++ rest
219 | (cv < 0x20 || cv > 0x7e || cv == 0x22 || cv == 0x27 || cv == 0x5c) =
221 where (q1,r1) = quotRem cv 16
224 hs = dropWhile (=='0') $ reverse $ mkHex cv
226 mkHex num = intToDigit r : mkHex q
227 where (q,r) = quotRem num 16
228 f cv rest = (chr cv):rest