aboutsummaryrefslogtreecommitdiff
path: root/src/Text/Pandoc/Writers/RTF.hs
blob: 01bc4b7827fd64f2550a06965db16f1987c8cf2b (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
{-
Copyright (C) 2006-2015 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.RTF
   Copyright   : Copyright (C) 2006-2015 John MacFarlane
   License     : GNU GPL, version 2 or above

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

Conversion of 'Pandoc' documents to RTF (rich text format).
-}
module Text.Pandoc.Writers.RTF ( writeRTF, writeRTFWithEmbeddedImages ) where
import Text.Pandoc.Definition
import Text.Pandoc.Options
import Text.Pandoc.Shared
import Text.Pandoc.Writers.Shared
import Text.Pandoc.Readers.TeXMath
import Text.Pandoc.Templates (renderTemplate')
import Text.Pandoc.Walk
import Data.List ( isSuffixOf, intercalate )
import Data.Char ( ord, chr, isDigit )
import qualified Data.ByteString as B
import qualified Data.Map as M
import Text.Printf ( printf )
import Text.Pandoc.ImageSize

-- | Convert Image inlines into a raw RTF embedded image, read from a file,
-- or a MediaBag, or the internet.
-- If file not found or filetype not jpeg or png, leave the inline unchanged.
rtfEmbedImage :: WriterOptions -> Inline -> IO Inline
rtfEmbedImage opts x@(Image _ (src,_)) = do
  result <- fetchItem' (writerMediaBag opts) (writerSourceURL opts) src
  case result of
       Right (imgdata, Just mime)
         | mime == "image/jpeg" || mime == "image/png" -> do
         let bytes = map (printf "%02x") $ B.unpack imgdata
         let filetype = case mime of
                             "image/jpeg" -> "\\jpegblip"
                             "image/png"  -> "\\pngblip"
                             _            -> error "Unknown file type"
         let sizeSpec = case imageSize imgdata of
                             Nothing -> ""
                             Just sz -> "\\picw" ++ show xpx ++
                                        "\\pich" ++ show ypx ++
                                        "\\picwgoal" ++ show (xpt * 20)
                                        ++ "\\pichgoal" ++ show (ypt * 20)
                                -- twip = 1/1440in = 1/20pt
                                where (xpx, ypx) = sizeInPixels sz
                                      (xpt, ypt) = sizeInPoints sz
         let raw = "{\\pict" ++ filetype ++ sizeSpec ++ " " ++
                    concat bytes ++ "}"
         return $ if B.null imgdata
                     then x
                     else RawInline (Format "rtf") raw
       _ -> return x
rtfEmbedImage _ x = return x

-- | Convert Pandoc to a string in rich text format, with
-- images embedded as encoded binary data.
writeRTFWithEmbeddedImages :: WriterOptions -> Pandoc -> IO String
writeRTFWithEmbeddedImages options doc =
  writeRTF options `fmap` walkM (rtfEmbedImage options) doc

-- | Convert Pandoc to a string in rich text format.
writeRTF :: WriterOptions -> Pandoc -> String
writeRTF options (Pandoc meta@(Meta metamap) blocks) =
  let spacer = not $ all null $ docTitle meta : docDate meta : docAuthors meta
      toPlain (MetaBlocks [Para ils]) = MetaInlines ils
      toPlain x = x
      -- adjust title, author, date so we don't get para inside para
      meta'  = Meta $ M.adjust toPlain "title"
                    . M.adjust toPlain "author"
                    . M.adjust toPlain "date"
                    $ metamap
      Just metadata = metaToJSON options
              (Just . concatMap (blockToRTF 0 AlignDefault))
              (Just . inlineListToRTF)
              meta'
      body = concatMap (blockToRTF 0 AlignDefault) blocks
      isTOCHeader (Header lev _ _) = lev <= writerTOCDepth options
      isTOCHeader _ = False
      context = defField "body" body
              $ defField "spacer" spacer
              $ (if writerTableOfContents options
                    then defField "toc"
                          (tableOfContents $ filter isTOCHeader blocks)
                    else id)
              $ metadata
  in  if writerStandalone options
         then renderTemplate' (writerTemplate options) context
         else case reverse body of
                ('\n':_) -> body
                _        -> body ++ "\n"

-- | Construct table of contents from list of header blocks.
tableOfContents :: [Block] -> String
tableOfContents headers =
  let contentsTree = hierarchicalize headers
  in  concatMap (blockToRTF 0 AlignDefault) $
      [Header 1 nullAttr [Str "Contents"],
       BulletList (map elementToListItem contentsTree)]

elementToListItem :: Element -> [Block]
elementToListItem (Blk _) = []
elementToListItem (Sec _ _ _ sectext subsecs) = [Plain sectext] ++
  if null subsecs
     then []
     else [BulletList (map elementToListItem subsecs)]

-- | Convert unicode characters (> 127) into rich text format representation.
handleUnicode :: String -> String
handleUnicode [] = []
handleUnicode (c:cs) =
  if ord c > 127
     then if surrogate c
          then let x = ord c - 0x10000
                   (q, r) = x `divMod` 0x400
                   upper = q + 0xd800
                   lower = r + 0xDC00
               in enc (chr upper) ++ enc (chr lower) ++ handleUnicode cs
          else enc c ++ handleUnicode cs
     else c:(handleUnicode cs)
  where
    surrogate x = not (   (0x0000 <= ord x && ord x <= 0xd7ff)
                       || (0xe000 <= ord x && ord x <= 0xffff) )
    enc x = '\\':'u':(show (ord x)) ++ "?"

-- | Escape special characters.
escapeSpecial :: String -> String
escapeSpecial = escapeStringUsing $
  [ ('\t',"\\tab ")
  , ('\8216',"\\u8216'")
  , ('\8217',"\\u8217'")
  , ('\8220',"\\u8220\"")
  , ('\8221',"\\u8221\"")
  , ('\8211',"\\u8211-")
  , ('\8212',"\\u8212-")
  ] ++ backslashEscapes "{\\}"

-- | Escape strings as needed for rich text format.
stringToRTF :: String -> String
stringToRTF = handleUnicode . escapeSpecial

-- | Escape things as needed for code block in RTF.
codeStringToRTF :: String -> String
codeStringToRTF str = intercalate "\\line\n" $ lines (stringToRTF str)

-- | Make a paragraph with first-line indent, block indent, and space after.
rtfParSpaced :: Int       -- ^ space after (in twips)
             -> Int       -- ^ block indent (in twips)
             -> Int       -- ^ first line indent (relative to block) (in twips)
             -> Alignment -- ^ alignment
             -> String    -- ^ string with content
             -> String
rtfParSpaced spaceAfter indent firstLineIndent alignment content =
  let alignString = case alignment of
                           AlignLeft -> "\\ql "
                           AlignRight -> "\\qr "
                           AlignCenter -> "\\qc "
                           AlignDefault -> "\\ql "
  in  "{\\pard " ++ alignString ++
      "\\f0 \\sa" ++ (show spaceAfter) ++ " \\li" ++ (show indent) ++
      " \\fi" ++ (show firstLineIndent) ++ " " ++ content ++ "\\par}\n"

-- | Default paragraph.
rtfPar :: Int       -- ^ block indent (in twips)
       -> Int       -- ^ first line indent (relative to block) (in twips)
       -> Alignment -- ^ alignment
       -> String    -- ^ string with content
       -> String
rtfPar = rtfParSpaced 180

-- | Compact paragraph (e.g. for compact list items).
rtfCompact ::  Int       -- ^ block indent (in twips)
           ->  Int       -- ^ first line indent (relative to block) (in twips)
           ->  Alignment -- ^ alignment
           ->  String    -- ^ string with content
           ->  String
rtfCompact = rtfParSpaced 0

-- number of twips to indent
indentIncrement :: Int
indentIncrement = 720

listIncrement :: Int
listIncrement = 360

-- | Returns appropriate bullet list marker for indent level.
bulletMarker :: Int -> String
bulletMarker indent = case indent `mod` 720 of
                             0 -> "\\bullet "
                             _ -> "\\endash "

-- | Returns appropriate (list of) ordered list markers for indent level.
orderedMarkers :: Int -> ListAttributes -> [String]
orderedMarkers indent (start, style, delim) =
  if style == DefaultStyle && delim == DefaultDelim
     then case indent `mod` 720 of
              0 -> orderedListMarkers (start, Decimal, Period)
              _ -> orderedListMarkers (start, LowerAlpha, Period)
     else orderedListMarkers (start, style, delim)

-- | Convert Pandoc block element to RTF.
blockToRTF :: Int       -- ^ indent level
           -> Alignment -- ^ alignment
           -> Block     -- ^ block to convert
           -> String
blockToRTF _ _ Null = ""
blockToRTF indent alignment (Div _ bs) =
  concatMap (blockToRTF indent alignment) bs
blockToRTF indent alignment (Plain lst) =
  rtfCompact indent 0 alignment $ inlineListToRTF lst
blockToRTF indent alignment (Para lst) =
  rtfPar indent 0 alignment $ inlineListToRTF lst
blockToRTF indent alignment (BlockQuote lst) =
  concatMap (blockToRTF (indent + indentIncrement) alignment) lst
blockToRTF indent _ (CodeBlock _ str) =
  rtfPar indent 0 AlignLeft ("\\f1 " ++ (codeStringToRTF str))
blockToRTF _ _ (RawBlock f str)
  | f == Format "rtf" = str
  | otherwise         = ""
blockToRTF indent alignment (BulletList lst) = spaceAtEnd $
  concatMap (listItemToRTF alignment indent (bulletMarker indent)) lst
blockToRTF indent alignment (OrderedList attribs lst) = spaceAtEnd $ concat $
  zipWith (listItemToRTF alignment indent) (orderedMarkers indent attribs) lst
blockToRTF indent alignment (DefinitionList lst) = spaceAtEnd $
  concatMap (definitionListItemToRTF alignment indent) lst
blockToRTF indent _ HorizontalRule =
  rtfPar indent 0 AlignCenter "\\emdash\\emdash\\emdash\\emdash\\emdash"
blockToRTF indent alignment (Header level _ lst) = rtfPar indent 0 alignment $
  "\\b \\fs" ++ (show (40 - (level * 4))) ++ " " ++ inlineListToRTF lst
blockToRTF indent alignment (Table caption aligns sizes headers rows) =
  (if all null headers
      then ""
      else tableRowToRTF True indent aligns sizes headers) ++
  concatMap (tableRowToRTF False indent aligns sizes) rows ++
  rtfPar indent 0 alignment (inlineListToRTF caption)

tableRowToRTF :: Bool -> Int -> [Alignment] -> [Double] -> [[Block]] -> String
tableRowToRTF header indent aligns sizes' cols =
  let totalTwips = 6 * 1440 -- 6 inches
      sizes = if all (== 0) sizes'
                 then take (length cols) $ repeat (1.0 / fromIntegral (length cols))
                 else sizes'
      columns = concat $ zipWith (tableItemToRTF indent) aligns cols
      rightEdges = tail $ scanl (\sofar new -> sofar + floor (new * totalTwips))
                                (0 :: Integer) sizes
      cellDefs = map (\edge -> (if header
                                   then "\\clbrdrb\\brdrs"
                                   else "") ++ "\\cellx" ++ show edge)
                     rightEdges
      start = "{\n\\trowd \\trgaph120\n" ++ concat cellDefs ++ "\n" ++
              "\\trkeep\\intbl\n{\n"
      end = "}\n\\intbl\\row}\n"
  in  start ++ columns ++ end

tableItemToRTF :: Int -> Alignment -> [Block] -> String
tableItemToRTF indent alignment item =
  let contents = concatMap (blockToRTF indent alignment) item
  in  "{" ++ substitute "\\pard" "\\pard\\intbl" contents ++ "\\cell}\n"

-- | Ensure that there's the same amount of space after compact
-- lists as after regular lists.
spaceAtEnd :: String -> String
spaceAtEnd str =
  if isSuffixOf "\\par}\n" str
     then (take ((length str) - 6) str) ++ "\\sa180\\par}\n"
     else str

-- | Convert list item (list of blocks) to RTF.
listItemToRTF :: Alignment  -- ^ alignment
              -> Int        -- ^ indent level
              -> String     -- ^ list start marker
              -> [Block]    -- ^ list item (list of blocks)
              -> [Char]
listItemToRTF alignment indent marker [] =
  rtfCompact (indent + listIncrement) (0 - listIncrement) alignment
             (marker ++ "\\tx" ++ (show listIncrement) ++ "\\tab ")
listItemToRTF alignment indent marker list =
  let (first:rest) = map (blockToRTF (indent + listIncrement) alignment) list
      listMarker = "\\fi" ++ show (0 - listIncrement) ++ " " ++ marker ++ "\\tx" ++
                      show listIncrement ++ "\\tab"
      insertListMarker ('\\':'f':'i':'-':d:xs) | isDigit d =
        listMarker ++ dropWhile isDigit xs
      insertListMarker ('\\':'f':'i':d:xs) | isDigit d =
        listMarker ++ dropWhile isDigit xs
      insertListMarker (x:xs) =
        x : insertListMarker xs
      insertListMarker [] = []
      -- insert the list marker into the (processed) first block
  in  insertListMarker first ++ concat rest

-- | Convert definition list item (label, list of blocks) to RTF.
definitionListItemToRTF :: Alignment          -- ^ alignment
                        -> Int                -- ^ indent level
                        -> ([Inline],[[Block]]) -- ^ list item (list of blocks)
                        -> [Char]
definitionListItemToRTF alignment indent (label, defs) =
  let labelText = blockToRTF indent alignment (Plain label)
      itemsText = concatMap (blockToRTF (indent + listIncrement) alignment) $
                    concat defs
  in  labelText ++ itemsText

-- | Convert list of inline items to RTF.
inlineListToRTF :: [Inline]   -- ^ list of inlines to convert
                -> String
inlineListToRTF lst = concatMap inlineToRTF lst

-- | Convert inline item to RTF.
inlineToRTF :: Inline         -- ^ inline to convert
            -> String
inlineToRTF (Span _ lst) = inlineListToRTF lst
inlineToRTF (Emph lst) = "{\\i " ++ (inlineListToRTF lst) ++ "}"
inlineToRTF (Strong lst) = "{\\b " ++ (inlineListToRTF lst) ++ "}"
inlineToRTF (Strikeout lst) = "{\\strike " ++ (inlineListToRTF lst) ++ "}"
inlineToRTF (Superscript lst) = "{\\super " ++ (inlineListToRTF lst) ++ "}"
inlineToRTF (Subscript lst) = "{\\sub " ++ (inlineListToRTF lst) ++ "}"
inlineToRTF (SmallCaps lst) = "{\\scaps " ++ (inlineListToRTF lst) ++ "}"
inlineToRTF (Quoted SingleQuote lst) =
  "\\u8216'" ++ (inlineListToRTF lst) ++ "\\u8217'"
inlineToRTF (Quoted DoubleQuote lst) =
  "\\u8220\"" ++ (inlineListToRTF lst) ++ "\\u8221\""
inlineToRTF (Code _ str) = "{\\f1 " ++ (codeStringToRTF str) ++ "}"
inlineToRTF (Str str) = stringToRTF str
inlineToRTF (Math t str) = inlineListToRTF $ texMathToInlines t str
inlineToRTF (Cite _ lst) = inlineListToRTF lst
inlineToRTF (RawInline f str)
  | f == Format "rtf" = str
  | otherwise         = ""
inlineToRTF (LineBreak) = "\\line "
inlineToRTF Space = " "
inlineToRTF (Link text (src, _)) =
  "{\\field{\\*\\fldinst{HYPERLINK \"" ++ (codeStringToRTF src) ++
  "\"}}{\\fldrslt{\\ul\n" ++ (inlineListToRTF text) ++ "\n}}}\n"
inlineToRTF (Image _ (source, _)) =
  "{\\cf1 [image: " ++ source ++ "]\\cf0}"
inlineToRTF (Note contents) =
  "{\\super\\chftn}{\\*\\footnote\\chftn\\~\\plain\\pard " ++
  (concatMap (blockToRTF 0 AlignDefault) contents) ++ "}"