aboutsummaryrefslogtreecommitdiff
path: root/src/Haddock/Backends/Hoogle.hs
blob: 33dd5da87c8c1335f66db95b563c229342c46eb1 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
--
-- Haddock - A Haskell Documentation Tool
--
-- (c) Simon Marlow 2003
--
-- This file, (c) Neil Mitchell 2006-2008
-- Write out Hoogle compatible documentation
-- http://www.haskell.org/hoogle/

module Haddock.Backends.Hoogle ( 
    ppHoogle
  ) where


import Haddock.GHC
import GHC hiding ((<.>))
import SrcLoc
import Outputable

import Control.Monad
import Data.Char
import Data.List
import Data.Maybe
import qualified Data.Set as Set
import System.FilePath


prefix = ["-- Hoogle documentation, generated by Haddock"
         ,"-- See Hoogle, http://www.haskell.org/hoogle/"
         ,""]


ppHoogle :: String -> String -> [Interface] -> FilePath -> IO ()
ppHoogle package version ifaces odir = do
    let filename = package <.> "txt"
        contents = prefix ++
                   ["@package " ++ package] ++
                   ["@version " ++ version | version /= ""] ++
                   concat [ppModule i | i <- ifaces, OptHide `notElem` ifaceOptions i]
    writeFile (odir </> filename) (unlines contents)


ppModule :: Interface -> [String]
ppModule iface = "" : doc (ifaceDoc iface) ++
                 ["module " ++ moduleString (ifaceMod iface)] ++
                 concatMap ppExport exported ++
                 concatMap ppInstance (ifaceInstances iface)
    where
        locals = Set.fromList $ ifaceLocals iface
        exported = [i | i@(ExportDecl{expItemDecl=decl}) <- ifaceExportItems iface
                      , isLocal (unLoc decl)]
        isLocal decl
          | Just name <- getMainDeclBinder decl = name `Set.member` locals
          | otherwise = False


---------------------------------------------------------------------
-- Utility functions

unL (L _ x) = x
reL = L undefined


dropComment (' ':'-':'-':' ':_) = []
dropComment (x:xs) = x : dropComment xs
dropComment [] = []


out :: Outputable a => a -> String
out = f . unwords . map (dropWhile isSpace) . lines . showSDocUnqual . ppr
    where
        f xs | " <document comment>" `isPrefixOf` xs = f $ drop 19 xs
        f (x:xs) = x : f xs
        f [] = []


typeSig :: String -> [String] -> String
typeSig name flds = operator name ++ " :: " ++ concat (intersperse " -> " flds)


operator :: String -> String
operator (x:xs) | not (isAlphaNum x) && x `notElem` " ([{" = "(" ++ x:xs ++ ")"
operator x = x


---------------------------------------------------------------------
-- How to print each export

ppExport :: ExportItem Name -> [String]
ppExport (ExportDecl decl dc _) = doc dc ++ f (unL decl)
    where
        f (TyClD d@TyData{}) = ppData d
        f (TyClD d@ClassDecl{}) = ppClass d
        f (ForD (ForeignImport name typ _)) = [out $ SigD $ TypeSig name typ]
        f (ForD (ForeignExport name typ _)) = [out $ SigD $ TypeSig name typ]
        f decl = [out decl]
ppExport _ = []


-- note: does not yet output documentation for class methods
ppClass :: TyClDecl Name -> [String]
ppClass x = out x{tcdSigs=[]} :
            map (out . addContext . unL) (tcdSigs x)
    where
        addContext (TypeSig name (L l sig)) = TypeSig name (L l $ f sig)
        f (HsForAllTy a b con d) = HsForAllTy a b (reL $ context : unL con) d
        f x = HsForAllTy Implicit [] (reL [context]) (reL x)

        context = reL $ HsClassP (unL $ tcdLName x)
            (map (reL . HsTyVar . tyVar . unL) (tcdTyVars x))

        tyVar (UserTyVar x) = x
        tyVar (KindedTyVar x _) = x


ppInstance :: Instance -> [String]
ppInstance x = [dropComment $ out x]


ppData :: TyClDecl Name -> [String]
ppData x = showData x{tcdCons=[],tcdDerivs=Nothing} :
           concatMap (ppCtor x . unL) (tcdCons x)
    where
        -- GHC gives out "data Bar =", we want to delete the equals
        -- also writes data : a b, when we want data (:) a b
        showData x = unwords $ map f $ if last xs == "=" then init xs else xs
            where
                xs = words $ out x
                nam = out $ tcdLName x
                f x = if x == nam then operator nam else x


ppCtor :: TyClDecl Name -> ConDecl Name -> [String]
ppCtor dat con = ldoc (con_doc con) ++ f (con_details con)
    where
        f (PrefixCon args) = [typeSig name $ map out args ++ [resType]]
        f (InfixCon a1 a2) = f $ PrefixCon [a1,a2]
        f (RecCon recs) = f (PrefixCon $ map cd_fld_type recs) ++ concat
                          [ldoc (cd_fld_doc r) ++
                           [out (unL $ cd_fld_name r) `typeSig` [resType, out $ cd_fld_type r]]
                          | r <- recs]

        name = out $ unL $ con_name con

        resType = case con_res con of
            ResTyH98 -> unwords $ operator (out (tcdLName dat)) : map out (tcdTyVars dat)
            ResTyGADT x -> out $ unL x


---------------------------------------------------------------------
-- DOCUMENTATION

ldoc :: Maybe (LHsDoc Name) -> [String]
ldoc = doc . liftM unL

doc :: Maybe (HsDoc Name) -> [String]
doc Nothing = []
doc (Just d) = "" : zipWith (++) ("-- | " : repeat "--   ") (showTags $ markup markupTag d)


data Tag = TagL Char [Tags] | TagP Tags | TagPre Tags | TagInline String Tags | Str String
           deriving Show

type Tags = [Tag]

box f x = [f x]
str a = [Str a]

-- want things like paragraph, pre etc to be handled by blank lines in the source document
-- and things like \n and \t converted away
-- much like blogger in HTML mode
-- everything else wants to be included as tags, neatly nested for some (ul,li,ol)
-- or inlne for others (a,i,tt)
-- entities (&,>,<) should always be appropriately escaped

markupTag :: DocMarkup Name [Tag]
markupTag = Markup {
  markupParagraph     = box TagP,
  markupEmpty         = str "",
  markupString        = str,
  markupAppend        = (++),
  markupIdentifier    = box (TagInline "a") . str . out . head,
  markupModule        = box (TagInline "a") . str,
  markupEmphasis      = box (TagInline "i"),
  markupMonospaced    = box (TagInline "tt"),
  markupUnorderedList = box (TagL 'u'),
  markupOrderedList   = box (TagL 'o'),
  markupDefList       = box (TagL 'u') . map (\(a,b) -> TagInline "b" a : Str " " : b),
  markupCodeBlock     = box TagPre,
  markupURL           = box (TagInline "a") . str,
  markupAName         = const $ str ""
  }


showTags :: [Tag] -> [String]
showTags = concat . intersperse [""] . map showBlock
    where


showBlock :: Tag -> [String]
showBlock (TagP xs) = showInline xs
showBlock (TagL t xs) = ['<':t:"l>"] ++ mid ++ ['<':'/':t:"l>"]
    where mid = concatMap (showInline . box (TagInline "li")) xs
showBlock (TagPre xs) = ["<pre>"] ++ showPre xs ++ ["</pre>"]
showBlock x = showInline [x]


asInline (TagP xs) = xs
asInline (TagPre xs) = [TagInline "pre" xs]
asInline (TagL t xs) = [TagInline (t:"l") $ map (TagInline "li") xs]
asInline x = [x]


showInline :: [Tag] -> [String]
showInline = unwordsWrap 70 . words . concatMap f
    where
        fs = concatMap f
        f (Str x) = escape x
        f (TagInline s xs) = "<"++s++">" ++ (if s == "li" then trim else id) (fs xs) ++ "</"++s++">"
        f x = fs $ asInline x

        trim = dropWhile isSpace . reverse . dropWhile isSpace . reverse


showPre :: [Tag] -> [String]
showPre = trimFront . trimLines . lines . concatMap f
    where
        trimLines = dropWhile null . reverse . dropWhile null . reverse
        trimFront xs = map (drop i) xs
            where
                ns = [length a | x <- xs, let (a,b) = span isSpace x, b /= ""]
                i = if null ns then 0 else minimum ns

        fs = concatMap f
        f (Str x) = escape x
        f (TagInline s xs) = "<"++s++">" ++ fs xs ++ "</"++s++">"
        f x = fs $ asInline x


unwordsWrap :: Int -> [String] -> [String]
unwordsWrap n = f n []
    where
        f i s [] = [g s | s /= []]
        f i s (x:xs) | nx > i = g s : f (n - nx - 1) [x] xs
                     | otherwise = f (i - nx - 1) (x:s) xs
            where nx = length x

        g = unwords . reverse


escape :: String -> String
escape = concatMap f
    where
        f '<' = "&lt;"
        f '>' = "&gt;"
        f '&' = "&amp;"
        f x = [x]