aboutsummaryrefslogtreecommitdiff
path: root/src/Text/Pandoc/Writers/Docbook.hs
blob: b31eb976fca3fed169c97ae6220c6fa528ea5cb8 (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
{-
Copyright (C) 2006-2010 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.Docbook
   Copyright   : Copyright (C) 2006-2010 John MacFarlane
   License     : GNU GPL, version 2 or above

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

Conversion of 'Pandoc' documents to Docbook XML.
-}
module Text.Pandoc.Writers.Docbook ( writeDocbook) where
import Text.Pandoc.Definition
import Text.Pandoc.XML
import Text.Pandoc.Shared
import Text.Pandoc.Options
import Text.Pandoc.Templates (renderTemplate)
import Text.Pandoc.Readers.TeXMath
import Data.List ( isPrefixOf, intercalate, isSuffixOf )
import Data.Char ( toLower )
import Text.Pandoc.Highlighting ( languages, languagesByExtension )
import Text.Pandoc.Pretty
import Text.TeXMath
import qualified Text.XML.Light as Xml
import Data.Generics (everywhere, mkT)

-- | Convert list of authors to a docbook <author> section
authorToDocbook :: WriterOptions -> [Inline] -> Doc
authorToDocbook opts name' =
  let name = render Nothing $ inlinesToDocbook opts name'
  in  if ',' `elem` name
         then -- last name first
              let (lastname, rest) = break (==',') name
                  firstname = removeLeadingSpace rest in
              inTagsSimple "firstname" (text $ escapeStringForXML firstname) <>
              inTagsSimple "surname" (text $ escapeStringForXML lastname)
         else -- last name last
              let namewords = words name
                  lengthname = length namewords
                  (firstname, lastname) = case lengthname of
                    0  -> ("","")
                    1  -> ("", name)
                    n  -> (intercalate " " (take (n-1) namewords), last namewords)
               in inTagsSimple "firstname" (text $ escapeStringForXML firstname) $$
                  inTagsSimple "surname" (text $ escapeStringForXML lastname)

-- | Convert Pandoc document to string in Docbook format.
writeDocbook :: WriterOptions -> Pandoc -> String
writeDocbook opts (Pandoc (Meta tit auths dat) blocks) =
  let title = inlinesToDocbook opts tit
      authors = map (authorToDocbook opts) auths
      date = inlinesToDocbook opts dat
      elements = hierarchicalize blocks
      colwidth = if writerWrapText opts
                    then Just $ writerColumns opts
                    else Nothing
      render' = render colwidth
      opts' = if "/book>" `isSuffixOf`
                      (removeTrailingSpace $ writerTemplate opts)
                 then opts{ writerChapters = True }
                 else opts
      startLvl = if writerChapters opts' then 0 else 1
      main     = render' $ vcat (map (elementToDocbook opts' startLvl) elements)
      context = writerVariables opts ++
                [ ("body", main)
                , ("title", render' title)
                , ("date", render' date) ] ++
                [ ("author", render' a) | a <- authors ] ++
                [ ("mathml", "yes") | case writerHTMLMathMethod opts of
                                            MathML _ -> True
                                            _ -> False ]
  in  if writerStandalone opts
         then renderTemplate context $ writerTemplate opts
         else main

-- | Convert an Element to Docbook.
elementToDocbook :: WriterOptions -> Int -> Element -> Doc
elementToDocbook opts _   (Blk block) = blockToDocbook opts block
elementToDocbook opts lvl (Sec _ _num id' title elements) =
  -- Docbook doesn't allow sections with no content, so insert some if needed
  let elements' = if null elements
                    then [Blk (Para [])]
                    else elements
      tag = case lvl of
                 n | n == 0           -> "chapter"
                   | n >= 1 && n <= 5 -> "sect" ++ show n
                   | otherwise        -> "simplesect"
  in  inTags True tag [("id",id')] $
      inTagsSimple "title" (inlinesToDocbook opts title) $$
      vcat (map (elementToDocbook opts (lvl + 1)) elements')

-- | Convert a list of Pandoc blocks to Docbook.
blocksToDocbook :: WriterOptions -> [Block] -> Doc
blocksToDocbook opts = vcat . map (blockToDocbook opts)

-- | Auxiliary function to convert Plain block to Para.
plainToPara :: Block -> Block
plainToPara (Plain x) = Para x
plainToPara x         = x

-- | Convert a list of pairs of terms and definitions into a list of
-- Docbook varlistentrys.
deflistItemsToDocbook :: WriterOptions -> [([Inline],[[Block]])] -> Doc
deflistItemsToDocbook opts items =
  vcat $ map (\(term, defs) -> deflistItemToDocbook opts term defs) items

-- | Convert a term and a list of blocks into a Docbook varlistentry.
deflistItemToDocbook :: WriterOptions -> [Inline] -> [[Block]] -> Doc
deflistItemToDocbook opts term defs =
  let def' = concatMap (map plainToPara) defs
  in  inTagsIndented "varlistentry" $
      inTagsIndented "term" (inlinesToDocbook opts term) $$
      inTagsIndented "listitem" (blocksToDocbook opts def')

-- | Convert a list of lists of blocks to a list of Docbook list items.
listItemsToDocbook :: WriterOptions -> [[Block]] -> Doc
listItemsToDocbook opts items = vcat $ map (listItemToDocbook opts) items

-- | Convert a list of blocks into a Docbook list item.
listItemToDocbook :: WriterOptions -> [Block] -> Doc
listItemToDocbook opts item =
  inTagsIndented "listitem" $ blocksToDocbook opts $ map plainToPara item

-- | Convert a Pandoc block element to Docbook.
blockToDocbook :: WriterOptions -> Block -> Doc
blockToDocbook _ Null = empty
blockToDocbook _ (Header _ _) = empty -- should not occur after hierarchicalize
blockToDocbook opts (Plain lst) = inlinesToDocbook opts lst
blockToDocbook opts (Para [Image txt (src,_)]) =
  let capt = inlinesToDocbook opts txt
  in  inTagsIndented "figure" $
        inTagsSimple "title" capt $$
        (inTagsIndented "mediaobject" $
           (inTagsIndented "imageobject"
             (selfClosingTag "imagedata" [("fileref",src)])) $$
           inTagsSimple "textobject" (inTagsSimple "phrase" capt))
blockToDocbook opts (Para lst) =
  inTagsIndented "para" $ inlinesToDocbook opts lst
blockToDocbook opts (BlockQuote blocks) =
  inTagsIndented "blockquote" $ blocksToDocbook opts blocks
blockToDocbook _ (CodeBlock (_,classes,_) str) =
  text ("<programlisting" ++ lang ++ ">") <> cr <>
     flush (text (escapeStringForXML str) <> cr <> text "</programlisting>")
    where lang  = if null langs
                     then ""
                     else " language=\"" ++ escapeStringForXML (head langs) ++
                          "\""
          isLang l    = map toLower l `elem` map (map toLower) languages
          langsFrom s = if isLang s
                           then [s]
                           else languagesByExtension . map toLower $ s
          langs       = concatMap langsFrom classes
blockToDocbook opts (BulletList lst) =
  inTagsIndented "itemizedlist" $ listItemsToDocbook opts lst
blockToDocbook _ (OrderedList _ []) = empty
blockToDocbook opts (OrderedList (start, numstyle, _) (first:rest)) =
  let attribs  = case numstyle of
                       DefaultStyle -> []
                       Decimal      -> [("numeration", "arabic")]
                       Example      -> [("numeration", "arabic")]
                       UpperAlpha   -> [("numeration", "upperalpha")]
                       LowerAlpha   -> [("numeration", "loweralpha")]
                       UpperRoman   -> [("numeration", "upperroman")]
                       LowerRoman   -> [("numeration", "lowerroman")]
      items    = if start == 1
                    then listItemsToDocbook opts (first:rest)
                    else (inTags True "listitem" [("override",show start)]
                         (blocksToDocbook opts $ map plainToPara first)) $$
                         listItemsToDocbook opts rest
  in  inTags True "orderedlist" attribs items
blockToDocbook opts (DefinitionList lst) =
  inTagsIndented "variablelist" $ deflistItemsToDocbook opts lst
blockToDocbook _ (RawBlock "docbook" str) = text str -- raw XML block
-- we allow html for compatibility with earlier versions of pandoc
blockToDocbook _ (RawBlock "html" str) = text str -- raw XML block
blockToDocbook _ (RawBlock _ _) = empty
blockToDocbook _ HorizontalRule = empty -- not semantic
blockToDocbook opts (Table caption aligns widths headers rows) =
  let captionDoc   = if null caption
                        then empty
                        else inTagsIndented "title"
                              (inlinesToDocbook opts caption)
      tableType    = if isEmpty captionDoc then "informaltable" else "table"
      percent w    = show (truncate (100*w) :: Integer) ++ "*"
      coltags = vcat $ zipWith (\w al -> selfClosingTag "colspec"
                       ([("colwidth", percent w) | w > 0] ++
                        [("align", alignmentToString al)])) widths aligns
      head' = if all null headers
                 then empty
                 else inTagsIndented "thead" $
                         tableRowToDocbook opts headers
      body' = inTagsIndented "tbody" $
              vcat $ map (tableRowToDocbook opts) rows
  in  inTagsIndented tableType $ captionDoc $$
        (inTags True "tgroup" [("cols", show (length headers))] $
         coltags $$ head' $$ body')

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

tableRowToDocbook :: WriterOptions
                  -> [[Block]]
                  -> Doc
tableRowToDocbook opts cols =
  inTagsIndented "row" $ vcat $ map (tableItemToDocbook opts) cols

tableItemToDocbook :: WriterOptions
                   -> [Block]
                   -> Doc
tableItemToDocbook opts item =
  inTags True "entry" [] $ vcat $ map (blockToDocbook opts) item

-- | Convert a list of inline elements to Docbook.
inlinesToDocbook :: WriterOptions -> [Inline] -> Doc
inlinesToDocbook opts lst = hcat $ map (inlineToDocbook opts) lst

-- | Convert an inline element to Docbook.
inlineToDocbook :: WriterOptions -> Inline -> Doc
inlineToDocbook _ (Str str) = text $ escapeStringForXML str
inlineToDocbook opts (Emph lst) =
  inTagsSimple "emphasis" $ inlinesToDocbook opts lst
inlineToDocbook opts (Strong lst) =
  inTags False "emphasis" [("role", "strong")] $ inlinesToDocbook opts lst
inlineToDocbook opts (Strikeout lst) =
  inTags False "emphasis" [("role", "strikethrough")] $
  inlinesToDocbook opts lst
inlineToDocbook opts (Superscript lst) =
  inTagsSimple "superscript" $ inlinesToDocbook opts lst
inlineToDocbook opts (Subscript lst) =
  inTagsSimple "subscript" $ inlinesToDocbook opts lst
inlineToDocbook opts (SmallCaps lst) =
  inTags False "emphasis" [("role", "smallcaps")] $
  inlinesToDocbook opts lst
inlineToDocbook opts (Quoted _ lst) =
  inTagsSimple "quote" $ inlinesToDocbook opts lst
inlineToDocbook opts (Cite _ lst) =
  inlinesToDocbook opts lst
inlineToDocbook _ (Code _ str) =
  inTagsSimple "literal" $ text (escapeStringForXML str)
inlineToDocbook opts (Math t str)
  | isMathML (writerHTMLMathMethod opts) =
    case texMathToMathML dt str of
      Right r -> inTagsSimple tagtype
                 $ text $ Xml.ppcElement conf
                 $ fixNS
                 $ removeAttr r
      Left  _ -> inlinesToDocbook opts
                 $ readTeXMath str
  | otherwise = inlinesToDocbook opts $ readTeXMath str
     where (dt, tagtype) = case t of
                            InlineMath  -> (DisplayInline,"inlineequation")
                            DisplayMath -> (DisplayBlock,"informalequation")
           conf = Xml.useShortEmptyTags (const False) Xml.defaultConfigPP
           removeAttr e = e{ Xml.elAttribs = [] }
           fixNS' qname = qname{ Xml.qPrefix = Just "mml" }
           fixNS = everywhere (mkT fixNS')
inlineToDocbook _ (RawInline f x) | f == "html" || f == "docbook" = text x
                                  | otherwise                     = empty
inlineToDocbook _ LineBreak = inTagsSimple "literallayout" empty
inlineToDocbook _ Space = space
inlineToDocbook opts (Link txt (src, _)) =
  if isPrefixOf "mailto:" src
     then let src' = drop 7 src
              emailLink = inTagsSimple "email" $ text $
                          escapeStringForXML $ src'
          in  case txt of
               [Code _ s] | s == src' -> emailLink
               _             -> inlinesToDocbook opts txt <+>
                                  char '(' <> emailLink <> char ')'
     else (if isPrefixOf "#" src
              then inTags False "link" [("linkend", drop 1 src)]
              else inTags False "ulink" [("url", src)]) $
          inlinesToDocbook opts txt
inlineToDocbook _ (Image _ (src, tit)) =
  let titleDoc = if null tit
                   then empty
                   else inTagsIndented "objectinfo" $
                        inTagsIndented "title" (text $ escapeStringForXML tit)
  in  inTagsIndented "inlinemediaobject" $ inTagsIndented "imageobject" $
      titleDoc $$ selfClosingTag "imagedata" [("fileref", src)]
inlineToDocbook opts (Note contents) =
  inTagsIndented "footnote" $ blocksToDocbook opts contents

isMathML :: HTMLMathMethod -> Bool
isMathML (MathML _) = True
isMathML _          = False