aboutsummaryrefslogtreecommitdiff
path: root/src/Text/Pandoc/Writers/MediaWiki.hs
blob: 3b2028997ee5b6d630527aea8704684f53415629 (plain)
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
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
{-
Copyright (C) 2008-2015 John MacFarlane <jgm@berkeley.edu>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
-}

{- |
   Module      : Text.Pandoc.Writers.MediaWiki
   Copyright   : Copyright (C) 2008-2015 John MacFarlane
   License     : GNU GPL, version 2 or above

   Maintainer  : John MacFarlane <jgm@berkeley.edu>
   Stability   : alpha
   Portability : portable

Conversion of 'Pandoc' documents to MediaWiki markup.

MediaWiki:  <http://www.mediawiki.org/wiki/MediaWiki>
-}
module Text.Pandoc.Writers.MediaWiki ( writeMediaWiki ) where
import Text.Pandoc.Definition
import Text.Pandoc.Options
import Text.Pandoc.Shared
import Text.Pandoc.Writers.Shared
import Text.Pandoc.Pretty (render)
import Text.Pandoc.ImageSize
import Text.Pandoc.Templates (renderTemplate')
import Text.Pandoc.XML ( escapeStringForXML )
import Data.List ( intersect, intercalate )
import Network.URI ( isURI )
import Control.Monad.Reader
import Control.Monad.State

data WriterState = WriterState {
    stNotes     :: Bool            -- True if there are notes
  , stOptions   :: WriterOptions   -- writer options
  }

data WriterReader = WriterReader {
    options     :: WriterOptions -- Writer options
  , listLevel   :: String        -- String at beginning of list items, e.g. "**"
  , useTags     :: Bool          -- True if we should use HTML tags because we're in a complex list
  }

type MediaWikiWriter = ReaderT WriterReader (State WriterState)

-- | Convert Pandoc to MediaWiki.
writeMediaWiki :: WriterOptions -> Pandoc -> String
writeMediaWiki opts document =
  let initialState = WriterState { stNotes = False, stOptions = opts }
      env = WriterReader { options = opts, listLevel = [], useTags = False }
  in  evalState (runReaderT (pandocToMediaWiki document) env) initialState

-- | Return MediaWiki representation of document.
pandocToMediaWiki :: Pandoc -> MediaWikiWriter String
pandocToMediaWiki (Pandoc meta blocks) = do
  opts <- asks options
  metadata <- metaToJSON opts
              (fmap trimr . blockListToMediaWiki)
              inlineListToMediaWiki
              meta
  body <- blockListToMediaWiki blocks
  notesExist <- gets stNotes
  let notes = if notesExist
                 then "\n<references />"
                 else ""
  let main = body ++ notes
  let context = defField "body" main
                $ defField "toc" (writerTableOfContents opts) metadata
  return $ if writerStandalone opts
     then renderTemplate' (writerTemplate opts) context
     else main

-- | Escape special characters for MediaWiki.
escapeString :: String -> String
escapeString =  escapeStringForXML

-- | Convert Pandoc block element to MediaWiki.
blockToMediaWiki :: Block         -- ^ Block element
                 -> MediaWikiWriter String

blockToMediaWiki Null = return ""

blockToMediaWiki (Div attrs bs) = do
  contents <- blockListToMediaWiki bs
  return $ render Nothing (tagWithAttrs "div" attrs) ++ "\n\n" ++
                     contents ++ "\n\n" ++ "</div>"

blockToMediaWiki (Plain inlines) =
  inlineListToMediaWiki inlines

-- title beginning with fig: indicates that the image is a figure
blockToMediaWiki (Para [Image attr txt (src,'f':'i':'g':':':tit)]) = do
  capt <- if null txt
             then return ""
             else ("|caption " ++) `fmap` inlineListToMediaWiki txt
  img  <- imageToMediaWiki attr
  let opt = if null txt
               then ""
               else "|alt=" ++ if null tit then capt else tit ++ capt
  return $ "[[File:" ++ src ++ "|frame|none" ++ img ++ opt ++ "]]\n"

blockToMediaWiki (Para inlines) = do
  tags <- asks useTags
  lev <- asks listLevel
  contents <- inlineListToMediaWiki inlines
  return $ if tags
              then  "<p>" ++ contents ++ "</p>"
              else contents ++ if null lev then "\n" else ""

blockToMediaWiki (LineBlock lns) =
  blockToMediaWiki $ linesToPara lns

blockToMediaWiki (RawBlock f str)
  | f == Format "mediawiki" = return str
  | f == Format "html"      = return str
  | otherwise               = return ""

blockToMediaWiki HorizontalRule = return "\n-----\n"

blockToMediaWiki (Header level _ inlines) = do
  contents <- inlineListToMediaWiki inlines
  let eqs = replicate level '='
  return $ eqs ++ " " ++ contents ++ " " ++ eqs ++ "\n"

blockToMediaWiki (CodeBlock (_,classes,_) str) = do
  let at  = classes `intersect` ["actionscript", "ada", "apache", "applescript", "asm", "asp",
                       "autoit", "bash", "blitzbasic", "bnf", "c", "c_mac", "caddcl", "cadlisp", "cfdg", "cfm",
                       "cpp", "cpp-qt", "csharp", "css", "d", "delphi", "diff", "div", "dos", "eiffel", "fortran",
                       "freebasic", "gml", "groovy", "html4strict", "idl", "ini", "inno", "io", "java", "java5",
                       "javascript", "latex", "lisp", "lua", "matlab", "mirc", "mpasm", "mysql", "nsis", "objc",
                       "ocaml", "ocaml-brief", "oobas", "oracle8", "pascal", "perl", "php", "php-brief", "plsql",
                       "python", "qbasic", "rails", "reg", "robots", "ruby", "sas", "scheme", "sdlbasic",
                       "smalltalk", "smarty", "sql", "tcl", "", "thinbasic", "tsql", "vb", "vbnet", "vhdl",
                       "visualfoxpro", "winbatch", "xml", "xpp", "z80"]
  return $
    if null at
       then "<pre" ++ (if null classes
                          then ">"
                          else " class=\"" ++ unwords classes ++ "\">") ++
            escapeString str ++ "</pre>"
       else "<source lang=\"" ++ head at ++ "\">" ++ str ++ "</source>"
            -- note:  no escape!

blockToMediaWiki (BlockQuote blocks) = do
  contents <- blockListToMediaWiki blocks
  return $ "<blockquote>" ++ contents ++ "</blockquote>"

blockToMediaWiki (Table capt aligns widths headers rows') = do
  caption <- if null capt
                then return ""
                else do
                   c <- inlineListToMediaWiki capt
                   return $ "|+ " ++ trimr c ++ "\n"
  let headless = all null headers
  let allrows = if headless then rows' else headers:rows'
  tableBody <- intercalate "|-\n" `fmap`
                mapM (tableRowToMediaWiki headless aligns widths)
                     (zip [1..] allrows)
  return $ "{|\n" ++ caption ++ tableBody ++ "|}\n"

blockToMediaWiki x@(BulletList items) = do
  tags <- fmap (|| not (isSimpleList x)) $ asks useTags
  if tags
     then do
        contents <- local (\ s -> s { useTags = True }) $ mapM listItemToMediaWiki items
        return $ "<ul>\n" ++ vcat contents ++ "</ul>\n"
     else do
        lev <- asks listLevel
        contents <- local (\s -> s { listLevel = listLevel s ++ "*" }) $ mapM listItemToMediaWiki items
        return $ vcat contents ++ if null lev then "\n" else ""

blockToMediaWiki x@(OrderedList attribs items) = do
  tags <- fmap (|| not (isSimpleList x)) $ asks useTags
  if tags
     then do
        contents <- local (\s -> s { useTags = True }) $ mapM listItemToMediaWiki items
        return $ "<ol" ++ listAttribsToString attribs ++ ">\n" ++ vcat contents ++ "</ol>\n"
     else do
        lev <- asks listLevel
        contents <- local (\s -> s { listLevel = listLevel s ++ "#" }) $ mapM listItemToMediaWiki items
        return $ vcat contents ++ if null lev then "\n" else ""

blockToMediaWiki x@(DefinitionList items) = do
  tags <- fmap (|| not (isSimpleList x)) $ asks useTags
  if tags
     then do
        contents <- local (\s -> s { useTags = True }) $ mapM definitionListItemToMediaWiki items
        return $ "<dl>\n" ++ vcat contents ++ "</dl>\n"
     else do
        lev <- asks listLevel
        contents <- local (\s -> s { listLevel = listLevel s ++ ";" }) $ mapM definitionListItemToMediaWiki items
        return $ vcat contents ++ if null lev then "\n" else ""

-- Auxiliary functions for lists:

-- | Convert ordered list attributes to HTML attribute string
listAttribsToString :: ListAttributes -> String
listAttribsToString (startnum, numstyle, _) =
  let numstyle' = camelCaseToHyphenated $ show numstyle
  in  (if startnum /= 1
          then " start=\"" ++ show startnum ++ "\""
          else "") ++
      (if numstyle /= DefaultStyle
          then " style=\"list-style-type: " ++ numstyle' ++ ";\""
          else "")

-- | Convert bullet or ordered list item (list of blocks) to MediaWiki.
listItemToMediaWiki :: [Block] -> MediaWikiWriter String
listItemToMediaWiki items = do
  contents <- blockListToMediaWiki items
  tags <- asks useTags
  if tags
     then return $ "<li>" ++ contents ++ "</li>"
     else do
       marker <- asks listLevel
       return $ marker ++ " " ++ contents

-- | Convert definition list item (label, list of blocks) to MediaWiki.
definitionListItemToMediaWiki :: ([Inline],[[Block]])
                              -> MediaWikiWriter String
definitionListItemToMediaWiki (label, items) = do
  labelText <- inlineListToMediaWiki label
  contents <- mapM blockListToMediaWiki items
  tags <- asks useTags
  if tags
     then return $ "<dt>" ++ labelText ++ "</dt>\n" ++
           intercalate "\n" (map (\d -> "<dd>" ++ d ++ "</dd>") contents)
     else do
       marker <- asks listLevel
       return $ marker ++ " " ++ labelText ++ "\n" ++
           intercalate "\n" (map (\d -> init marker ++ ": " ++ d) contents)

-- | True if the list can be handled by simple wiki markup, False if HTML tags will be needed.
isSimpleList :: Block -> Bool
isSimpleList x =
  case x of
       BulletList items                 -> all isSimpleListItem items
       OrderedList (num, sty, _) items  -> all isSimpleListItem items &&
                                            num == 1 && sty `elem` [DefaultStyle, Decimal]
       DefinitionList items             -> all isSimpleListItem $ concatMap snd items
       _                                -> False

-- | True if list item can be handled with the simple wiki syntax.  False if
--   HTML tags will be needed.
isSimpleListItem :: [Block] -> Bool
isSimpleListItem []  = True
isSimpleListItem [x] =
  case x of
       Plain _           -> True
       Para  _           -> True
       BulletList _      -> isSimpleList x
       OrderedList _ _   -> isSimpleList x
       DefinitionList _  -> isSimpleList x
       _                 -> False
isSimpleListItem [x, y] | isPlainOrPara x =
  case y of
       BulletList _      -> isSimpleList y
       OrderedList _ _   -> isSimpleList y
       DefinitionList _  -> isSimpleList y
       _                 -> False
isSimpleListItem _ = False

isPlainOrPara :: Block -> Bool
isPlainOrPara (Plain _) = True
isPlainOrPara (Para  _) = True
isPlainOrPara _         = False

-- | Concatenates strings with line breaks between them.
vcat :: [String] -> String
vcat = intercalate "\n"

-- Auxiliary functions for tables:

tableRowToMediaWiki :: Bool
                    -> [Alignment]
                    -> [Double]
                    -> (Int, [[Block]])
                    -> MediaWikiWriter String
tableRowToMediaWiki headless alignments widths (rownum, cells) = do
  cells' <- mapM (tableCellToMediaWiki headless rownum)
          $ zip3 alignments widths cells
  return $ unlines cells'

tableCellToMediaWiki :: Bool
                     -> Int
                     -> (Alignment, Double, [Block])
                     -> MediaWikiWriter String
tableCellToMediaWiki headless rownum (alignment, width, bs) = do
  contents <- blockListToMediaWiki bs
  let marker = if rownum == 1 && not headless then "!" else "|"
  let percent w = show (truncate (100*w) :: Integer) ++ "%"
  let attrs = ["align=" ++ show (alignmentToString alignment) |
                 alignment /= AlignDefault && alignment /= AlignLeft] ++
              ["width=\"" ++ percent width ++ "\"" |
                 width /= 0.0 && rownum == 1]
  let attr = if null attrs
                then ""
                else unwords attrs ++ "|"
  let sep = case bs of
                 [Plain _] -> " "
                 [Para  _] -> " "
                 _         -> "\n"
  return $ marker ++ attr ++ sep ++ trimr contents

alignmentToString :: Alignment -> String
alignmentToString alignment = case alignment of
                                 AlignLeft    -> "left"
                                 AlignRight   -> "right"
                                 AlignCenter  -> "center"
                                 AlignDefault -> "left"

imageToMediaWiki :: Attr -> MediaWikiWriter String
imageToMediaWiki attr = do
  opts <- gets stOptions
  let (_, cls, _) = attr
      toPx = fmap (showInPixel opts) . checkPct
      checkPct (Just (Percent _)) = Nothing
      checkPct maybeDim = maybeDim
      go (Just w) Nothing  = '|':w ++ "px"
      go (Just w) (Just h) = '|':w ++ "x" ++ h ++ "px"
      go Nothing  (Just h) = "|x" ++ h ++ "px"
      go Nothing  Nothing  = ""
      dims = go (toPx $ dimension Width attr) (toPx $ dimension Height attr)
      classes = if null cls
                   then ""
                   else "|class=" ++ unwords cls
  return $ dims ++ classes

-- | Convert list of Pandoc block elements to MediaWiki.
blockListToMediaWiki :: [Block]       -- ^ List of block elements
                     -> MediaWikiWriter String
blockListToMediaWiki blocks =
  fmap vcat $ mapM blockToMediaWiki blocks

-- | Convert list of Pandoc inline elements to MediaWiki.
inlineListToMediaWiki :: [Inline] -> MediaWikiWriter String
inlineListToMediaWiki lst =
  fmap concat $ mapM inlineToMediaWiki lst

-- | Convert Pandoc inline element to MediaWiki.
inlineToMediaWiki :: Inline -> MediaWikiWriter String

inlineToMediaWiki (Span attrs ils) = do
  contents <- inlineListToMediaWiki ils
  return $ render Nothing (tagWithAttrs "span" attrs) ++ contents ++ "</span>"

inlineToMediaWiki (Emph lst) = do
  contents <- inlineListToMediaWiki lst
  return $ "''" ++ contents ++ "''"

inlineToMediaWiki (Strong lst) = do
  contents <- inlineListToMediaWiki lst
  return $ "'''" ++ contents ++ "'''"

inlineToMediaWiki (Strikeout lst) = do
  contents <- inlineListToMediaWiki lst
  return $ "<s>" ++ contents ++ "</s>"

inlineToMediaWiki (Superscript lst) = do
  contents <- inlineListToMediaWiki lst
  return $ "<sup>" ++ contents ++ "</sup>"

inlineToMediaWiki (Subscript lst) = do
  contents <- inlineListToMediaWiki lst
  return $ "<sub>" ++ contents ++ "</sub>"

inlineToMediaWiki (SmallCaps lst) = inlineListToMediaWiki lst

inlineToMediaWiki (Quoted SingleQuote lst) = do
  contents <- inlineListToMediaWiki lst
  return $ "\8216" ++ contents ++ "\8217"

inlineToMediaWiki (Quoted DoubleQuote lst) = do
  contents <- inlineListToMediaWiki lst
  return $ "\8220" ++ contents ++ "\8221"

inlineToMediaWiki (Cite _  lst) = inlineListToMediaWiki lst

inlineToMediaWiki (Code _ str) =
  return $ "<code>" ++ escapeString str ++ "</code>"

inlineToMediaWiki (Str str) = return $ escapeString str

inlineToMediaWiki (Math _ str) = return $ "<math>" ++ str ++ "</math>"
                               -- note:  str should NOT be escaped

inlineToMediaWiki (RawInline f str)
  | f == Format "mediawiki" = return str
  | f == Format "html"      = return str
  | otherwise               = return ""

inlineToMediaWiki (LineBreak) = return "<br />\n"

inlineToMediaWiki SoftBreak = do
  wrapText <- gets (writerWrapText . stOptions)
  case wrapText of
       WrapAuto     -> return " "
       WrapNone     -> return " "
       WrapPreserve -> return "\n"

inlineToMediaWiki Space = return " "

inlineToMediaWiki (Link _ txt (src, _)) = do
  label <- inlineListToMediaWiki txt
  case txt of
     [Str s] | isURI src && escapeURI s == src -> return src
     _  -> return $ if isURI src
              then "[" ++ src ++ " " ++ label ++ "]"
              else "[[" ++ src' ++ "|" ++ label ++ "]]"
                     where src' = case src of
                                     '/':xs -> xs  -- with leading / it's a
                                     _      -> src -- link to a help page

inlineToMediaWiki (Image attr alt (source, tit)) = do
  img  <- imageToMediaWiki attr
  alt' <- inlineListToMediaWiki alt
  let txt = if null tit
               then if null alt
                       then ""
                       else '|' : alt'
               else '|' : tit
  return $ "[[File:" ++ source ++ img ++ txt ++ "]]"

inlineToMediaWiki (Note contents) = do
  contents' <- blockListToMediaWiki contents
  modify (\s -> s { stNotes = True })
  return $ "<ref>" ++ contents' ++ "</ref>"
  -- note - may not work for notes with multiple blocks