aboutsummaryrefslogtreecommitdiff
path: root/src/Text/Pandoc/Writers/Haddock.hs
blob: 14f398da9fec330975da5dfa07fbe4d736307c5d (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
{-# LANGUAGE OverloadedStrings, TupleSections, ScopedTypeVariables #-}
{-
Copyright (C) 2014 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.Haddock
   Copyright   : Copyright (C) 2014 John MacFarlane
   License     : GNU GPL, version 2 or above

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

Conversion of 'Pandoc' documents to haddock markup.

Haddock:  <http://www.haskell.org/haddock/doc/html/>
-}
module Text.Pandoc.Writers.Haddock (writeHaddock) where
import Text.Pandoc.Definition
import Text.Pandoc.Templates (renderTemplate')
import Text.Pandoc.Shared
import Text.Pandoc.Writers.Shared
import Text.Pandoc.Options
import Data.List ( intersperse, transpose )
import Text.Pandoc.Pretty
import Control.Monad.State
import Text.Pandoc.Readers.TeXMath (texMathToInlines)
import Network.URI (isURI)
import Data.Default

type Notes = [[Block]]
data WriterState = WriterState { stNotes :: Notes }
instance Default WriterState
  where def = WriterState{ stNotes = [] }

-- | Convert Pandoc to Haddock.
writeHaddock :: WriterOptions -> Pandoc -> String
writeHaddock opts document =
  evalState (pandocToHaddock opts{
                  writerWrapText = writerWrapText opts } document) def

-- | Return haddock representation of document.
pandocToHaddock :: WriterOptions -> Pandoc -> State WriterState String
pandocToHaddock opts (Pandoc meta blocks) = do
  let colwidth = if writerWrapText opts
                    then Just $ writerColumns opts
                    else Nothing
  body <- blockListToHaddock opts blocks
  st <- get
  notes' <- notesToHaddock opts (reverse $ stNotes st)
  let render' :: Doc -> String
      render' = render colwidth
  let main = render' $ body <>
               (if isEmpty notes' then empty else blankline <> notes')
  metadata <- metaToJSON opts
               (fmap (render colwidth) . blockListToHaddock opts)
               (fmap (render colwidth) . inlineListToHaddock opts)
               meta
  let context  = defField "body" main
               $ metadata
  if writerStandalone opts
     then return $ renderTemplate' (writerTemplate opts) context
     else return main

-- | Return haddock representation of notes.
notesToHaddock :: WriterOptions -> [[Block]] -> State WriterState Doc
notesToHaddock opts notes =
  if null notes
     then return empty
     else do
       contents <- blockToHaddock opts $ OrderedList (1,DefaultStyle,DefaultDelim) notes
       return $ text "#notes#" <> blankline <> contents

-- | Escape special characters for Haddock.
escapeString :: String -> String
escapeString = escapeStringUsing haddockEscapes
  where haddockEscapes = backslashEscapes "\\/'`\"@<"

-- | Convert Pandoc block element to haddock.
blockToHaddock :: WriterOptions -- ^ Options
                -> Block         -- ^ Block element
                -> State WriterState Doc
blockToHaddock _ Null = return empty
blockToHaddock opts (Div _ ils) = do
  contents <- blockListToHaddock opts ils
  return $ contents <> blankline
blockToHaddock opts (Plain inlines) = do
  contents <- inlineListToHaddock opts inlines
  return $ contents <> cr
-- title beginning with fig: indicates figure
blockToHaddock opts (Para [Image alt (src,'f':'i':'g':':':tit)]) =
  blockToHaddock opts (Para [Image alt (src,tit)])
blockToHaddock opts (Para inlines) =
  -- TODO:  if it contains linebreaks, we need to use a @...@ block
  (<> blankline) `fmap` blockToHaddock opts (Plain inlines)
blockToHaddock _ (RawBlock f str)
  | f == "haddock" = do
      return $ text str <> text "\n"
  | otherwise = return empty
blockToHaddock opts HorizontalRule =
  return $ blankline <> text (replicate (writerColumns opts) '_') <> blankline
blockToHaddock opts (Header level (ident,_,_) inlines) = do
  contents <- inlineListToHaddock opts inlines
  let attr' = if null ident
                 then empty
                 else cr <> text "#" <> text ident <> text "#"
  return $ nowrap (text (replicate level '=') <> space <> contents)
                 <> attr' <> blankline
blockToHaddock _ (CodeBlock (_,_,_) str) =
  return $ prefixed "> " (text str) <> blankline
-- Nothing in haddock corresponds to block quotes:
blockToHaddock opts (BlockQuote blocks) =
  blockListToHaddock opts blocks
-- Haddock doesn't have tables.  Use haddock tables in code.
blockToHaddock opts (Table caption aligns widths headers rows) = do
  caption' <- inlineListToHaddock opts caption
  let caption'' = if null caption
                     then empty
                     else blankline <> caption' <> blankline
  rawHeaders <- mapM (blockListToHaddock opts) headers
  rawRows <- mapM (mapM (blockListToHaddock opts)) rows
  let isSimple = all (==0) widths
  let isPlainBlock (Plain _) = True
      isPlainBlock _         = False
  let hasBlocks = not (all isPlainBlock $ concat . concat $ headers:rows)
  (nst,tbl) <- case True of
                _ | isSimple -> fmap (nest 2,) $
                         pandocTable opts (all null headers) aligns widths
                             rawHeaders rawRows
                  | not hasBlocks -> fmap (nest 2,) $
                         pandocTable opts (all null headers) aligns widths
                             rawHeaders rawRows
                  | otherwise -> fmap (id,) $
                         gridTable opts (all null headers) aligns widths
                             rawHeaders rawRows
  return $ (prefixed "> " $ nst $ tbl $$ blankline $$ caption'') $$ blankline
blockToHaddock opts (BulletList items) = do
  contents <- mapM (bulletListItemToHaddock opts) items
  return $ cat contents <> blankline
blockToHaddock opts (OrderedList (start,_,delim) items) = do
  let attribs = (start, Decimal, delim)
  let markers  = orderedListMarkers attribs
  let markers' = map (\m -> if length m < 3
                               then m ++ replicate (3 - length m) ' '
                               else m) markers
  contents <- mapM (\(item, num) -> orderedListItemToHaddock opts item num) $
              zip markers' items
  return $ cat contents <> blankline
blockToHaddock opts (DefinitionList items) = do
  contents <- mapM (definitionListItemToHaddock opts) items
  return $ cat contents <> blankline

pandocTable :: WriterOptions -> Bool -> [Alignment] -> [Double]
            -> [Doc] -> [[Doc]] -> State WriterState Doc
pandocTable opts headless aligns widths rawHeaders rawRows =  do
  let isSimple = all (==0) widths
  let alignHeader alignment = case alignment of
                                AlignLeft    -> lblock
                                AlignCenter  -> cblock
                                AlignRight   -> rblock
                                AlignDefault -> lblock
  let numChars = maximum . map offset
  let widthsInChars = if isSimple
                         then map ((+2) . numChars)
                              $ transpose (rawHeaders : rawRows)
                         else map
                              (floor . (fromIntegral (writerColumns opts) *))
                              widths
  let makeRow = hcat . intersperse (lblock 1 (text " ")) .
                   (zipWith3 alignHeader aligns widthsInChars)
  let rows' = map makeRow rawRows
  let head' = makeRow rawHeaders
  let maxRowHeight = maximum $ map height (head':rows')
  let underline = cat $ intersperse (text " ") $
                  map (\width -> text (replicate width '-')) widthsInChars
  let border = if maxRowHeight > 1
                  then text (replicate (sum widthsInChars +
                          length widthsInChars - 1) '-')
                  else if headless
                          then underline
                          else empty
  let head'' = if headless
                  then empty
                  else border <> cr <> head'
  let body = if maxRowHeight > 1
                then vsep rows'
                else vcat rows'
  let bottom = if headless
                  then underline
                  else border
  return $ head'' $$ underline $$ body $$ bottom

gridTable :: WriterOptions -> Bool -> [Alignment] -> [Double]
          -> [Doc] -> [[Doc]] -> State WriterState Doc
gridTable opts headless _aligns widths headers' rawRows =  do
  let numcols = length headers'
  let widths' = if all (==0) widths
                   then replicate numcols (1.0 / fromIntegral numcols)
                   else widths
  let widthsInChars = map (floor . (fromIntegral (writerColumns opts) *)) widths'
  let hpipeBlocks blocks = hcat [beg, middle, end]
        where h       = maximum (map height blocks)
              sep'    = lblock 3 $ vcat (map text $ replicate h " | ")
              beg     = lblock 2 $ vcat (map text $ replicate h "| ")
              end     = lblock 2 $ vcat (map text $ replicate h " |")
              middle  = chomp $ hcat $ intersperse sep' blocks
  let makeRow = hpipeBlocks . zipWith lblock widthsInChars
  let head' = makeRow headers'
  let rows' = map (makeRow . map chomp) rawRows
  let border ch = char '+' <> char ch <>
                  (hcat $ intersperse (char ch <> char '+' <> char ch) $
                          map (\l -> text $ replicate l ch) widthsInChars) <>
                  char ch <> char '+'
  let body = vcat $ intersperse (border '-') rows'
  let head'' = if headless
                  then empty
                  else head' $$ border '='
  return $ border '-' $$ head'' $$ body $$ border '-'

-- | Convert bullet list item (list of blocks) to haddock
bulletListItemToHaddock :: WriterOptions -> [Block] -> State WriterState Doc
bulletListItemToHaddock opts items = do
  contents <- blockListToHaddock opts items
  let sps = replicate (writerTabStop opts - 2) ' '
  let start = text ('-' : ' ' : sps)
  -- remove trailing blank line if it is a tight list
  let contents' = case reverse items of
                       (BulletList xs:_) | isTightList xs ->
                            chomp contents <> cr
                       (OrderedList _ xs:_) | isTightList xs ->
                            chomp contents <> cr
                       _ -> contents
  return $ hang (writerTabStop opts) start $ contents' <> cr

-- | Convert ordered list item (a list of blocks) to haddock
orderedListItemToHaddock :: WriterOptions -- ^ options
                          -> String        -- ^ list item marker
                          -> [Block]       -- ^ list item (list of blocks)
                          -> State WriterState Doc
orderedListItemToHaddock opts marker items = do
  contents <- blockListToHaddock opts items
  let sps = case length marker - writerTabStop opts of
                   n | n > 0 -> text $ replicate n ' '
                   _         -> text " "
  let start = text marker <> sps
  return $ hang (writerTabStop opts) start $ contents <> cr

-- | Convert definition list item (label, list of blocks) to haddock
definitionListItemToHaddock :: WriterOptions
                             -> ([Inline],[[Block]])
                             -> State WriterState Doc
definitionListItemToHaddock opts (label, defs) = do
  labelText <- inlineListToHaddock opts label
  defs' <- mapM (mapM (blockToHaddock opts)) defs
  let contents = vcat $ map (\d -> hang 4 empty $ vcat d <> cr) defs'
  return $ nowrap (brackets labelText) <> cr <> contents <> cr

-- | Convert list of Pandoc block elements to haddock
blockListToHaddock :: WriterOptions -- ^ Options
                    -> [Block]       -- ^ List of block elements
                    -> State WriterState Doc
blockListToHaddock opts blocks =
  mapM (blockToHaddock opts) blocks >>= return . cat

-- | Convert list of Pandoc inline elements to haddock.
inlineListToHaddock :: WriterOptions -> [Inline] -> State WriterState Doc
inlineListToHaddock opts lst =
  mapM (inlineToHaddock opts) lst >>= return . cat

-- | Convert Pandoc inline element to haddock.
inlineToHaddock :: WriterOptions -> Inline -> State WriterState Doc
inlineToHaddock opts (Span (ident,_,_) ils) = do
  contents <- inlineListToHaddock opts ils
  if not (null ident) && null ils
     then return $ "#" <> text ident <> "#"
     else return contents
inlineToHaddock opts (Emph lst) = do
  contents <- inlineListToHaddock opts lst
  return $ "/" <> contents <> "/"
inlineToHaddock opts (Strong lst) = do
  contents <- inlineListToHaddock opts lst
  return $ "__" <> contents <> "__"
inlineToHaddock opts (Strikeout lst) = do
  contents <- inlineListToHaddock opts lst
  -- not supported in haddock, but we fake it:
  return $ "~~" <> contents <> "~~"
-- not supported in haddock:
inlineToHaddock opts (Superscript lst) = inlineListToHaddock opts lst
-- not supported in haddock:
inlineToHaddock opts (Subscript lst) = inlineListToHaddock opts lst
-- not supported in haddock:
inlineToHaddock opts (SmallCaps lst) = inlineListToHaddock opts lst
inlineToHaddock opts (Quoted SingleQuote lst) = do
  contents <- inlineListToHaddock opts lst
  return $ "‘" <> contents <> "’"
inlineToHaddock opts (Quoted DoubleQuote lst) = do
  contents <- inlineListToHaddock opts lst
  return $ "“" <> contents <> "”"
inlineToHaddock _ (Code _ str) =
  return $ "@" <> text (escapeString str) <> "@"
inlineToHaddock _ (Str str) = do
  return $ text $ escapeString str
inlineToHaddock opts (Math mt str) = do
  let adjust x = case mt of
                      DisplayMath -> cr <> x <> cr
                      InlineMath  -> x
  adjust `fmap` (inlineListToHaddock opts $ texMathToInlines mt str)
inlineToHaddock _ (RawInline f str)
  | f == "haddock" = return $ text str
  | otherwise = return empty
-- no line break in haddock (see above on CodeBlock)
inlineToHaddock _ (LineBreak) = return cr
inlineToHaddock _ Space = return space
inlineToHaddock opts (Cite _ lst) = inlineListToHaddock opts lst
inlineToHaddock opts (Link txt (src, _)) = do
  linktext <- inlineListToHaddock opts txt
  let useAuto = isURI src &&
                case txt of
                      [Str s] | escapeURI s == src -> True
                      _                            -> False
  return $ nowrap $ "<" <> text src <>
           (if useAuto then empty else space <> linktext) <> ">"
inlineToHaddock opts (Image alternate (source, tit)) = do
  linkhaddock <- inlineToHaddock opts (Link alternate (source, tit))
  return $ "<" <> linkhaddock <> ">"
-- haddock doesn't have notes, but we can fake it:
inlineToHaddock opts (Note contents) = do
  modify (\st -> st{ stNotes = contents : stNotes st })
  st <- get
  let ref = text $ writerIdentifierPrefix opts ++ show (length $ stNotes st)
  return $ "<#notes [" <> ref <> "]>"