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
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
|
{-# LANGUAGE FlexibleContexts, FlexibleInstances, MultiParamTypeClasses,
ViewPatterns#-}
{-
Copyright (C) 2006-2014 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.Readers.HTML
Copyright : Copyright (C) 2006-2014 John MacFarlane
License : GNU GPL, version 2 or above
Maintainer : John MacFarlane <jgm@berkeley.edu>
Stability : alpha
Portability : portable
Conversion of HTML to 'Pandoc' document.
-}
module Text.Pandoc.Readers.HTML ( readHtml
, htmlTag
, htmlInBalanced
, isInlineTag
, isBlockTag
, isTextTag
, isCommentTag
) where
import Text.HTML.TagSoup
import Text.HTML.TagSoup.Match
import Text.Pandoc.Definition
import qualified Text.Pandoc.Builder as B
import Text.Pandoc.Builder (Blocks, Inlines, trimInlines, HasMeta(..))
import Text.Pandoc.Shared ( extractSpaces, renderTags'
, escapeURI, safeRead, mapLeft )
import Text.Pandoc.Options (ReaderOptions(readerParseRaw, readerTrace)
, Extension (Ext_epub_html_exts,
Ext_native_divs, Ext_native_spans))
import Text.Pandoc.Parsing hiding ((<|>))
import Text.Pandoc.Walk
import Data.Maybe ( fromMaybe, isJust)
import Data.List ( intercalate, isInfixOf, isPrefixOf )
import Data.Char ( isDigit )
import Control.Monad ( liftM, guard, when, mzero, void, unless )
import Control.Arrow ((***))
import Control.Applicative ( (<$>), (<$), (<*), (*>), (<|>))
import Data.Monoid (mconcat, Monoid, mempty, (<>), First (..))
import Text.Printf (printf)
import Debug.Trace (trace)
import Text.TeXMath (readMathML, writeTeX)
import Data.Default (Default (..), def)
import Control.Monad.Reader (Reader,ask, asks, local, runReader)
import Text.Pandoc.Error
import Text.Parsec.Error
-- | Convert HTML-formatted string to 'Pandoc' document.
readHtml :: ReaderOptions -- ^ Reader options
-> String -- ^ String to parse (assumes @'\n'@ line endings)
-> Either PandocError Pandoc
readHtml opts inp =
mapLeft (ParseFailure . getError) . flip runReader def $
runParserT parseDoc (HTMLState def{ stateOptions = opts } []) "source" tags
where tags = stripPrefixes . canonicalizeTags $
parseTagsOptions parseOptions{ optTagPosition = True } inp
parseDoc = do
blocks <- (fixPlains False) . mconcat <$> manyTill block eof
meta <- stateMeta . parserState <$> getState
bs' <- replaceNotes (B.toList blocks)
return $ Pandoc meta bs'
getError (errorMessages -> ms) = case ms of
[] -> ""
(m:_) -> messageString m
replaceNotes :: [Block] -> TagParser [Block]
replaceNotes = walkM replaceNotes'
replaceNotes' :: Inline -> TagParser Inline
replaceNotes' (RawInline (Format "noteref") ref) = maybe (Str "") (Note . B.toList) . lookup ref <$> getNotes
where
getNotes = noteTable <$> getState
replaceNotes' x = return x
data HTMLState =
HTMLState
{ parserState :: ParserState,
noteTable :: [(String, Blocks)]
}
data HTMLLocal = HTMLLocal { quoteContext :: QuoteContext
, inChapter :: Bool -- ^ Set if in chapter section
, inPlain :: Bool -- ^ Set if in pPlain
}
setInChapter :: HTMLParser s a -> HTMLParser s a
setInChapter = local (\s -> s {inChapter = True})
setInPlain :: HTMLParser s a -> HTMLParser s a
setInPlain = local (\s -> s {inPlain = True})
type HTMLParser s = ParserT s HTMLState (Reader HTMLLocal)
type TagParser = HTMLParser [Tag String]
pBody :: TagParser Blocks
pBody = pInTags "body" block
pHead :: TagParser Blocks
pHead = pInTags "head" $ pTitle <|> pMetaTag <|> (mempty <$ pAnyTag)
where pTitle = pInTags "title" inline >>= setTitle . trimInlines
setTitle t = mempty <$ (updateState $ B.setMeta "title" t)
pMetaTag = do
mt <- pSatisfy (~== TagOpen "meta" [])
let name = fromAttrib "name" mt
if null name
then return mempty
else do
let content = fromAttrib "content" mt
updateState $ B.setMeta name (B.text content)
return mempty
block :: TagParser Blocks
block = do
tr <- getOption readerTrace
pos <- getPosition
res <- choice
[ eSection
, eSwitch B.para block
, mempty <$ eFootnote
, mempty <$ eTOC
, mempty <$ eTitlePage
, pPara
, pHeader
, pBlockQuote
, pCodeBlock
, pList
, pHrule
, pTable
, pHead
, pBody
, pDiv
, pPlain
, pRawHtmlBlock
]
when tr $ trace (printf "line %d: %s" (sourceLine pos)
(take 60 $ show $ B.toList res)) (return ())
return res
namespaces :: [(String, TagParser Inlines)]
namespaces = [(mathMLNamespace, pMath True)]
mathMLNamespace :: String
mathMLNamespace = "http://www.w3.org/1998/Math/MathML"
eSwitch :: Monoid a => (Inlines -> a) -> TagParser a -> TagParser a
eSwitch constructor parser = try $ do
guardEnabled Ext_epub_html_exts
pSatisfy (~== TagOpen "switch" [])
cases <- getFirst . mconcat <$>
manyTill (First <$> (eCase <* skipMany pBlank) )
(lookAhead $ try $ pSatisfy (~== TagOpen "default" []))
skipMany pBlank
fallback <- pInTags "default" (skipMany pBlank *> parser <* skipMany pBlank)
skipMany pBlank
pSatisfy (~== TagClose "switch")
return $ maybe fallback constructor cases
eCase :: TagParser (Maybe Inlines)
eCase = do
skipMany pBlank
TagOpen _ attr <- lookAhead $ pSatisfy $ (~== TagOpen "case" [])
case (flip lookup namespaces) =<< lookup "required-namespace" attr of
Just p -> Just <$> (pInTags "case" (skipMany pBlank *> p <* skipMany pBlank))
Nothing -> Nothing <$ manyTill pAnyTag (pSatisfy (~== TagClose "case"))
eFootnote :: TagParser ()
eFootnote = try $ do
let notes = ["footnote", "rearnote"]
guardEnabled Ext_epub_html_exts
(TagOpen tag attr) <- lookAhead $ pAnyTag
guard (maybe False (flip elem notes) (lookup "type" attr))
let ident = fromMaybe "" (lookup "id" attr)
content <- pInTags tag block
addNote ident content
addNote :: String -> Blocks -> TagParser ()
addNote uid cont = updateState (\s -> s {noteTable = (uid, cont) : (noteTable s)})
eNoteref :: TagParser Inlines
eNoteref = try $ do
guardEnabled Ext_epub_html_exts
TagOpen tag attr <- lookAhead $ pAnyTag
guard (maybe False (== "noteref") (lookup "type" attr))
let ident = maybe "" (dropWhile (== '#')) (lookup "href" attr)
guard (not (null ident))
pInTags tag block
return $ B.rawInline "noteref" ident
-- Strip TOC if there is one, better to generate again
eTOC :: TagParser ()
eTOC = try $ do
guardEnabled Ext_epub_html_exts
(TagOpen tag attr) <- lookAhead $ pAnyTag
guard (maybe False (== "toc") (lookup "type" attr))
void (pInTags tag block)
pList :: TagParser Blocks
pList = pBulletList <|> pOrderedList <|> pDefinitionList
pBulletList :: TagParser Blocks
pBulletList = try $ do
pSatisfy (~== TagOpen "ul" [])
let nonItem = pSatisfy (\t ->
not (tagOpen (`elem` ["li","ol","ul","dl"]) (const True) t) &&
not (t ~== TagClose "ul"))
-- note: if they have an <ol> or <ul> not in scope of a <li>,
-- treat it as a list item, though it's not valid xhtml...
skipMany nonItem
items <- manyTill (pListItem nonItem) (pCloses "ul")
return $ B.bulletList $ map (fixPlains True) items
pListItem :: TagParser a -> TagParser Blocks
pListItem nonItem = do
TagOpen _ attr <- lookAhead $ pSatisfy (~== TagOpen "li" [])
let liDiv = maybe mempty (\x -> B.divWith (x, [], []) mempty) (lookup "id" attr)
(liDiv <>) <$> pInTags "li" block <* skipMany nonItem
pOrderedList :: TagParser Blocks
pOrderedList = try $ do
TagOpen _ attribs <- pSatisfy (~== TagOpen "ol" [])
let (start, style) = (sta', sty')
where sta = fromMaybe "1" $
lookup "start" attribs
sta' = if all isDigit sta
then read sta
else 1
sty = fromMaybe (fromMaybe "" $
lookup "style" attribs) $
lookup "class" attribs
sty' = case sty of
"lower-roman" -> LowerRoman
"upper-roman" -> UpperRoman
"lower-alpha" -> LowerAlpha
"upper-alpha" -> UpperAlpha
"decimal" -> Decimal
_ -> DefaultStyle
let nonItem = pSatisfy (\t ->
not (tagOpen (`elem` ["li","ol","ul","dl"]) (const True) t) &&
not (t ~== TagClose "ol"))
-- note: if they have an <ol> or <ul> not in scope of a <li>,
-- treat it as a list item, though it's not valid xhtml...
skipMany nonItem
items <- manyTill (pListItem nonItem) (pCloses "ol")
return $ B.orderedListWith (start, style, DefaultDelim) $ map (fixPlains True) items
pDefinitionList :: TagParser Blocks
pDefinitionList = try $ do
pSatisfy (~== TagOpen "dl" [])
items <- manyTill pDefListItem (pCloses "dl")
return $ B.definitionList items
pDefListItem :: TagParser (Inlines, [Blocks])
pDefListItem = try $ do
let nonItem = pSatisfy (\t -> not (t ~== TagOpen "dt" []) &&
not (t ~== TagOpen "dd" []) && not (t ~== TagClose "dl"))
terms <- many1 (try $ skipMany nonItem >> pInTags "dt" inline)
defs <- many1 (try $ skipMany nonItem >> pInTags "dd" block)
skipMany nonItem
let term = foldl1 (\x y -> x <> B.linebreak <> y) terms
return (term, map (fixPlains True) defs)
fixPlains :: Bool -> Blocks -> Blocks
fixPlains inList bs = if any isParaish bs'
then B.fromList $ map plainToPara bs'
else bs
where isParaish (Para _) = True
isParaish (CodeBlock _ _) = True
isParaish (Header _ _ _) = True
isParaish (BlockQuote _) = True
isParaish (BulletList _) = not inList
isParaish (OrderedList _ _) = not inList
isParaish (DefinitionList _) = not inList
isParaish _ = False
plainToPara (Plain xs) = Para xs
plainToPara x = x
bs' = B.toList bs
pRawTag :: TagParser String
pRawTag = do
tag <- pAnyTag
let ignorable x = x `elem` ["html","head","body","!DOCTYPE","?xml"]
if tagOpen ignorable (const True) tag || tagClose ignorable tag
then return []
else return $ renderTags' [tag]
pDiv :: TagParser Blocks
pDiv = try $ do
guardEnabled Ext_native_divs
TagOpen _ attr <- lookAhead $ pSatisfy $ tagOpen (=="div") (const True)
contents <- pInTags "div" block
return $ B.divWith (mkAttr attr) contents
pRawHtmlBlock :: TagParser Blocks
pRawHtmlBlock = do
raw <- pHtmlBlock "script" <|> pHtmlBlock "style" <|> pRawTag
parseRaw <- getOption readerParseRaw
if parseRaw && not (null raw)
then return $ B.rawBlock "html" raw
else return mempty
pHtmlBlock :: String -> TagParser String
pHtmlBlock t = try $ do
open <- pSatisfy (~== TagOpen t [])
contents <- manyTill pAnyTag (pSatisfy (~== TagClose t))
return $ renderTags' $ [open] ++ contents ++ [TagClose t]
-- Sets chapter context
eSection :: TagParser Blocks
eSection = try $ do
let matchChapter as = maybe False (isInfixOf "chapter") (lookup "type" as)
let sectTag = tagOpen (`elem` sectioningContent) matchChapter
TagOpen tag _ <- lookAhead $ pSatisfy sectTag
setInChapter (pInTags tag block)
headerLevel :: String -> TagParser Int
headerLevel tagtype = do
let level = read (drop 1 tagtype)
(try $ do
guardEnabled Ext_epub_html_exts
asks inChapter >>= guard
return (level - 1))
<|>
return level
eTitlePage :: TagParser ()
eTitlePage = try $ do
let isTitlePage as = maybe False (isInfixOf "titlepage") (lookup "type" as)
let groupTag = tagOpen (\x -> x `elem` groupingContent || x == "section")
isTitlePage
TagOpen tag _ <- lookAhead $ pSatisfy groupTag
() <$ pInTags tag block
pHeader :: TagParser Blocks
pHeader = try $ do
TagOpen tagtype attr <- pSatisfy $
tagOpen (`elem` ["h1","h2","h3","h4","h5","h6"])
(const True)
let bodyTitle = TagOpen tagtype attr ~== TagOpen "h1" [("class","title")]
level <- headerLevel tagtype
contents <- trimInlines . mconcat <$> manyTill inline (pCloses tagtype <|> eof)
let ident = fromMaybe "" $ lookup "id" attr
let classes = maybe [] words $ lookup "class" attr
let keyvals = [(k,v) | (k,v) <- attr, k /= "class", k /= "id"]
return $ if bodyTitle
then mempty -- skip a representation of the title in the body
else B.headerWith (ident, classes, keyvals) level contents
pHrule :: TagParser Blocks
pHrule = do
pSelfClosing (=="hr") (const True)
return B.horizontalRule
pTable :: TagParser Blocks
pTable = try $ do
TagOpen _ _ <- pSatisfy (~== TagOpen "table" [])
skipMany pBlank
caption <- option mempty $ pInTags "caption" inline <* skipMany pBlank
-- TODO actually read these and take width information from them
widths' <- pColgroup <|> many pCol
let pTh = option [] $ pInTags "tr" (pCell "th")
pTr = try $ skipMany pBlank >> pInTags "tr" (pCell "td" <|> pCell "th")
pTBody = do pOptInTag "tbody" $ many1 pTr
head'' <- pOptInTag "thead" pTh
head' <- pOptInTag "tbody" $ do
if null head''
then pTh
else return head''
rowsLs <- many pTBody
rows' <- pOptInTag "tfoot" $ many pTr
TagClose _ <- pSatisfy (~== TagClose "table")
let rows = (concat rowsLs) ++ rows'
-- fail on empty table
guard $ not $ null head' && null rows
let isSinglePlain x = case B.toList x of
[Plain _] -> True
_ -> False
let isSimple = all isSinglePlain $ concat (head':rows)
let cols = length $ if null head' then head rows else head'
-- fail if there are colspans or rowspans
guard $ all (\r -> length r == cols) rows
let aligns = replicate cols AlignDefault
let widths = if null widths'
then if isSimple
then replicate cols 0
else replicate cols (1.0 / fromIntegral cols)
else widths'
return $ B.table caption (zip aligns widths) head' rows
pCol :: TagParser Double
pCol = try $ do
TagOpen _ attribs <- pSatisfy (~== TagOpen "col" [])
skipMany pBlank
optional $ pSatisfy (~== TagClose "col")
skipMany pBlank
return $ case lookup "width" attribs of
Just x | not (null x) && last x == '%' ->
fromMaybe 0.0 $ safeRead ('0':'.':init x)
_ -> 0.0
pColgroup :: TagParser [Double]
pColgroup = try $ do
pSatisfy (~== TagOpen "colgroup" [])
skipMany pBlank
manyTill pCol (pCloses "colgroup" <|> eof) <* skipMany pBlank
pCell :: String -> TagParser [Blocks]
pCell celltype = try $ do
skipMany pBlank
res <- pInTags celltype block
skipMany pBlank
return [res]
pBlockQuote :: TagParser Blocks
pBlockQuote = do
contents <- pInTags "blockquote" block
return $ B.blockQuote $ fixPlains False contents
pPlain :: TagParser Blocks
pPlain = do
contents <- setInPlain $ trimInlines . mconcat <$> many1 inline
if B.isNull contents
then return mempty
else return $ B.plain contents
pPara :: TagParser Blocks
pPara = do
contents <- trimInlines <$> pInTags "p" inline
return $ B.para contents
pCodeBlock :: TagParser Blocks
pCodeBlock = try $ do
TagOpen _ attr <- pSatisfy (~== TagOpen "pre" [])
contents <- manyTill pAnyTag (pCloses "pre" <|> eof)
let rawText = concatMap tagToString contents
-- drop leading newline if any
let result' = case rawText of
'\n':xs -> xs
_ -> rawText
-- drop trailing newline if any
let result = case reverse result' of
'\n':_ -> init result'
_ -> result'
return $ B.codeBlockWith (mkAttr attr) result
tagToString :: Tag String -> String
tagToString (TagText s) = s
tagToString (TagOpen "br" _) = "\n"
tagToString _ = ""
inline :: TagParser Inlines
inline = choice
[ eNoteref
, eSwitch id inline
, pTagText
, pQ
, pEmph
, pStrong
, pSuperscript
, pSubscript
, pStrikeout
, pLineBreak
, pLink
, pImage
, pCode
, pSpan
, pMath False
, pRawHtmlInline
]
pLocation :: TagParser ()
pLocation = do
(TagPosition r c) <- pSat isTagPosition
setPosition $ newPos "input" r c
pSat :: (Tag String -> Bool) -> TagParser (Tag String)
pSat f = do
pos <- getPosition
token show (const pos) (\x -> if f x then Just x else Nothing)
pSatisfy :: (Tag String -> Bool) -> TagParser (Tag String)
pSatisfy f = try $ optional pLocation >> pSat f
pAnyTag :: TagParser (Tag String)
pAnyTag = pSatisfy (const True)
pSelfClosing :: (String -> Bool) -> ([Attribute String] -> Bool)
-> TagParser (Tag String)
pSelfClosing f g = do
open <- pSatisfy (tagOpen f g)
optional $ pSatisfy (tagClose f)
return open
pQ :: TagParser Inlines
pQ = do
context <- asks quoteContext
let quoteType = case context of
InDoubleQuote -> SingleQuote
_ -> DoubleQuote
let innerQuoteContext = if quoteType == SingleQuote
then InSingleQuote
else InDoubleQuote
let constructor = case quoteType of
SingleQuote -> B.singleQuoted
DoubleQuote -> B.doubleQuoted
withQuoteContext innerQuoteContext $
pInlinesInTags "q" constructor
pEmph :: TagParser Inlines
pEmph = pInlinesInTags "em" B.emph <|> pInlinesInTags "i" B.emph
pStrong :: TagParser Inlines
pStrong = pInlinesInTags "strong" B.strong <|> pInlinesInTags "b" B.strong
pSuperscript :: TagParser Inlines
pSuperscript = pInlinesInTags "sup" B.superscript
pSubscript :: TagParser Inlines
pSubscript = pInlinesInTags "sub" B.subscript
pStrikeout :: TagParser Inlines
pStrikeout = do
pInlinesInTags "s" B.strikeout <|>
pInlinesInTags "strike" B.strikeout <|>
pInlinesInTags "del" B.strikeout <|>
try (do pSatisfy (~== TagOpen "span" [("class","strikeout")])
contents <- mconcat <$> manyTill inline (pCloses "span")
return $ B.strikeout contents)
pLineBreak :: TagParser Inlines
pLineBreak = do
pSelfClosing (=="br") (const True)
return B.linebreak
pLink :: TagParser Inlines
pLink = pRelLink <|> pAnchor
pAnchor :: TagParser Inlines
pAnchor = try $ do
tag <- pSatisfy (tagOpenLit "a" (isJust . lookup "id"))
return $ B.spanWith (fromAttrib "id" tag , [], []) mempty
pRelLink :: TagParser Inlines
pRelLink = try $ do
tag <- pSatisfy (tagOpenLit "a" (isJust . lookup "href"))
let url = fromAttrib "href" tag
let title = fromAttrib "title" tag
let uid = fromAttrib "id" tag
let spanC = case uid of
[] -> id
s -> B.spanWith (s, [], [])
lab <- trimInlines . mconcat <$> manyTill inline (pCloses "a")
return $ spanC $ B.link (escapeURI url) title lab
pImage :: TagParser Inlines
pImage = do
tag <- pSelfClosing (=="img") (isJust . lookup "src")
let url = fromAttrib "src" tag
let title = fromAttrib "title" tag
let alt = fromAttrib "alt" tag
return $ B.image (escapeURI url) title (B.text alt)
pCode :: TagParser Inlines
pCode = try $ do
(TagOpen open attr) <- pSatisfy $ tagOpen (`elem` ["code","tt"]) (const True)
result <- manyTill pAnyTag (pCloses open)
return $ B.codeWith (mkAttr attr) $ intercalate " " $ lines $ innerText result
pSpan :: TagParser Inlines
pSpan = try $ do
guardEnabled Ext_native_spans
TagOpen _ attr <- lookAhead $ pSatisfy $ tagOpen (=="span") (const True)
contents <- pInTags "span" inline
let attr' = mkAttr attr
return $ case attr' of
("",[],[("style",s)])
| filter (`notElem` " \t;") s == "font-variant:small-caps" ->
B.smallcaps contents
_ -> B.spanWith (mkAttr attr) contents
pRawHtmlInline :: TagParser Inlines
pRawHtmlInline = do
inplain <- asks inPlain
result <- pSatisfy (tagComment (const True))
<|> if inplain
then pSatisfy (not . isBlockTag)
else pSatisfy isInlineTag
parseRaw <- getOption readerParseRaw
if parseRaw
then return $ B.rawInline "html" $ renderTags' [result]
else return mempty
mathMLToTeXMath :: String -> Either String String
mathMLToTeXMath s = writeTeX <$> readMathML s
pMath :: Bool -> TagParser Inlines
pMath inCase = try $ do
open@(TagOpen _ attr) <- pSatisfy $ tagOpen (=="math") (const True)
unless (inCase) (guard (maybe False (== mathMLNamespace) (lookup "xmlns" attr)))
contents <- manyTill pAnyTag (pSatisfy (~== TagClose "math"))
let math = mathMLToTeXMath $
(renderTags $ [open] ++ contents ++ [TagClose "math"])
let constructor =
maybe B.math (\x -> if (x == "inline") then B.math else B.displayMath)
(lookup "display" attr)
return $ either (const mempty)
(\x -> if null x then mempty else constructor x) math
pInlinesInTags :: String -> (Inlines -> Inlines)
-> TagParser Inlines
pInlinesInTags tagtype f = extractSpaces f <$> pInTags tagtype inline
pInTags :: (Monoid a) => String -> TagParser a
-> TagParser a
pInTags tagtype parser = try $ do
pSatisfy (~== TagOpen tagtype [])
mconcat <$> manyTill parser (pCloses tagtype <|> eof)
-- parses p, preceeded by an optional opening tag
-- and followed by an optional closing tags
pOptInTag :: String -> TagParser a -> TagParser a
pOptInTag tagtype p = try $ do
skipMany pBlank
optional $ pSatisfy (~== TagOpen tagtype [])
skipMany pBlank
x <- p
skipMany pBlank
optional $ pSatisfy (~== TagClose tagtype)
skipMany pBlank
return x
pCloses :: String -> TagParser ()
pCloses tagtype = try $ do
t <- lookAhead $ pSatisfy $ \tag -> isTagClose tag || isTagOpen tag
case t of
(TagClose t') | t' == tagtype -> pAnyTag >> return ()
(TagOpen t' _) | t' `closes` tagtype -> return ()
(TagClose "ul") | tagtype == "li" -> return ()
(TagClose "ol") | tagtype == "li" -> return ()
(TagClose "dl") | tagtype == "li" -> return ()
(TagClose "table") | tagtype == "td" -> return ()
(TagClose "table") | tagtype == "tr" -> return ()
_ -> mzero
pTagText :: TagParser Inlines
pTagText = try $ do
(TagText str) <- pSatisfy isTagText
st <- getState
qu <- ask
case flip runReader qu $ runParserT (many pTagContents) st "text" str of
Left _ -> fail $ "Could not parse `" ++ str ++ "'"
Right result -> return $ mconcat result
pBlank :: TagParser ()
pBlank = try $ do
(TagText str) <- pSatisfy isTagText
guard $ all isSpace str
type InlinesParser = HTMLParser String
pTagContents :: InlinesParser Inlines
pTagContents =
B.displayMath <$> mathDisplay
<|> B.math <$> mathInline
<|> pStr
<|> pSpace
<|> smartPunctuation pTagContents
<|> pSymbol
<|> pBad
pStr :: InlinesParser Inlines
pStr = do
result <- many1 $ satisfy $ \c ->
not (isSpace c) && not (isSpecial c) && not (isBad c)
updateLastStrPos
return $ B.str result
isSpecial :: Char -> Bool
isSpecial '"' = True
isSpecial '\'' = True
isSpecial '.' = True
isSpecial '-' = True
isSpecial '$' = True
isSpecial '\8216' = True
isSpecial '\8217' = True
isSpecial '\8220' = True
isSpecial '\8221' = True
isSpecial _ = False
pSymbol :: InlinesParser Inlines
pSymbol = satisfy isSpecial >>= return . B.str . (:[])
isBad :: Char -> Bool
isBad c = c >= '\128' && c <= '\159' -- not allowed in HTML
pBad :: InlinesParser Inlines
pBad = do
c <- satisfy isBad
let c' = case c of
'\128' -> '\8364'
'\130' -> '\8218'
'\131' -> '\402'
'\132' -> '\8222'
'\133' -> '\8230'
'\134' -> '\8224'
'\135' -> '\8225'
'\136' -> '\710'
'\137' -> '\8240'
'\138' -> '\352'
'\139' -> '\8249'
'\140' -> '\338'
'\142' -> '\381'
'\145' -> '\8216'
'\146' -> '\8217'
'\147' -> '\8220'
'\148' -> '\8221'
'\149' -> '\8226'
'\150' -> '\8211'
'\151' -> '\8212'
'\152' -> '\732'
'\153' -> '\8482'
'\154' -> '\353'
'\155' -> '\8250'
'\156' -> '\339'
'\158' -> '\382'
'\159' -> '\376'
_ -> '?'
return $ B.str [c']
pSpace :: InlinesParser Inlines
pSpace = many1 (satisfy isSpace) >> return B.space
--
-- Constants
--
eitherBlockOrInline :: [String]
eitherBlockOrInline = ["audio", "applet", "button", "iframe", "embed",
"del", "ins",
"progress", "map", "area", "noscript", "script",
"object", "svg", "video", "source"]
{-
inlineHtmlTags :: [[Char]]
inlineHtmlTags = ["a", "abbr", "acronym", "b", "basefont", "bdo", "big",
"br", "cite", "code", "dfn", "em", "font", "i", "img",
"input", "kbd", "label", "q", "s", "samp", "select",
"small", "span", "strike", "strong", "sub", "sup",
"textarea", "tt", "u", "var"]
-}
blockHtmlTags :: [String]
blockHtmlTags = ["?xml", "!DOCTYPE", "address", "article", "aside",
"blockquote", "body", "button", "canvas",
"caption", "center", "col", "colgroup", "dd", "dir", "div",
"dl", "dt", "fieldset", "figcaption", "figure",
"footer", "form", "h1", "h2", "h3", "h4",
"h5", "h6", "head", "header", "hgroup", "hr", "html",
"isindex", "menu", "noframes", "ol", "output", "p", "pre",
"section", "table", "tbody", "textarea",
"thead", "tfoot", "ul", "dd",
"dt", "frameset", "li", "tbody", "td", "tfoot",
"th", "thead", "tr", "script", "style"]
-- We want to allow raw docbook in markdown documents, so we
-- include docbook block tags here too.
blockDocBookTags :: [String]
blockDocBookTags = ["calloutlist", "bibliolist", "glosslist", "itemizedlist",
"orderedlist", "segmentedlist", "simplelist",
"variablelist", "caution", "important", "note", "tip",
"warning", "address", "literallayout", "programlisting",
"programlistingco", "screen", "screenco", "screenshot",
"synopsis", "example", "informalexample", "figure",
"informalfigure", "table", "informaltable", "para",
"simpara", "formalpara", "equation", "informalequation",
"figure", "screenshot", "mediaobject", "qandaset",
"procedure", "task", "cmdsynopsis", "funcsynopsis",
"classsynopsis", "blockquote", "epigraph", "msgset",
"sidebar", "title"]
epubTags :: [String]
epubTags = ["case", "switch", "default"]
blockTags :: [String]
blockTags = blockHtmlTags ++ blockDocBookTags ++ epubTags
isInlineTag :: Tag String -> Bool
isInlineTag t = tagOpen isInlineTagName (const True) t ||
tagClose isInlineTagName t ||
tagComment (const True) t
where isInlineTagName x = x `notElem` blockTags
isBlockTag :: Tag String -> Bool
isBlockTag t = tagOpen isBlockTagName (const True) t ||
tagClose isBlockTagName t ||
tagComment (const True) t
where isBlockTagName ('?':_) = True
isBlockTagName ('!':_) = True
isBlockTagName x = x `elem` blockTags
|| x `elem` eitherBlockOrInline
isTextTag :: Tag String -> Bool
isTextTag = tagText (const True)
isCommentTag :: Tag String -> Bool
isCommentTag = tagComment (const True)
-- taken from HXT and extended
-- See http://www.w3.org/TR/html5/syntax.html sec 8.1.2.4 optional tags
closes :: String -> String -> Bool
_ `closes` "body" = False
_ `closes` "html" = False
"a" `closes` "a" = True
"li" `closes` "li" = True
"th" `closes` t | t `elem` ["th","td"] = True
"tr" `closes` t | t `elem` ["th","td","tr"] = True
"dd" `closes` t | t `elem` ["dt", "dd"] = True
"dt" `closes` t | t `elem` ["dt","dd"] = True
"rt" `closes` t | t `elem` ["rb", "rt", "rtc"] = True
"optgroup" `closes` "optgroup" = True
"optgroup" `closes` "option" = True
"option" `closes` "option" = True
-- http://www.w3.org/TR/html-markup/p.html
x `closes` "p" | x `elem` ["address", "article", "aside", "blockquote",
"dir", "div", "dl", "fieldset", "footer", "form", "h1", "h2", "h3", "h4",
"h5", "h6", "header", "hr", "menu", "nav", "ol", "p", "pre", "section",
"table", "ul"] = True
"meta" `closes` "meta" = True
"form" `closes` "form" = True
"label" `closes` "label" = True
"map" `closes` "map" = True
"object" `closes` "object" = True
_ `closes` t | t `elem` ["option","style","script","textarea","title"] = True
t `closes` "select" | t /= "option" = True
"thead" `closes` t | t `elem` ["colgroup"] = True
"tfoot" `closes` t | t `elem` ["thead","colgroup"] = True
"tbody" `closes` t | t `elem` ["tbody","tfoot","thead","colgroup"] = True
t `closes` t2 |
t `elem` ["h1","h2","h3","h4","h5","h6","dl","ol","ul","table","div","p"] &&
t2 `elem` ["h1","h2","h3","h4","h5","h6","p" ] = True -- not "div"
t1 `closes` t2 |
t1 `elem` blockTags &&
t2 `notElem` (blockTags ++ eitherBlockOrInline) = True
_ `closes` _ = False
--- parsers for use in markdown, textile readers
-- | Matches a stretch of HTML in balanced tags.
htmlInBalanced :: (Monad m)
=> (Tag String -> Bool)
-> ParserT String st m String
htmlInBalanced f = try $ do
(TagOpen t _, tag) <- htmlTag f
guard $ '/' `notElem` tag -- not a self-closing tag
let stopper = htmlTag (~== TagClose t)
let anytag = snd <$> htmlTag (const True)
contents <- many $ notFollowedBy' stopper >>
(htmlInBalanced f <|> anytag <|> count 1 anyChar)
endtag <- liftM snd stopper
return $ tag ++ concat contents ++ endtag
-- | Matches a tag meeting a certain condition.
htmlTag :: Monad m
=> (Tag String -> Bool)
-> ParserT [Char] st m (Tag String, String)
htmlTag f = try $ do
lookAhead (char '<')
inp <- getInput
let (next : _) = canonicalizeTags $ parseTags inp
guard $ f next
case next of
TagComment s
| "<!--" `isPrefixOf` inp -> do
count (length s + 4) anyChar
skipMany (satisfy (/='>'))
char '>'
return (next, "<!--" ++ s ++ "-->")
| otherwise -> fail "bogus comment mode, HTML5 parse error"
_ -> do
rendered <- manyTill anyChar (char '>')
return (next, rendered ++ ">")
mkAttr :: [(String, String)] -> Attr
mkAttr attr = (attribsId, attribsClasses, attribsKV)
where attribsId = fromMaybe "" $ lookup "id" attr
attribsClasses = (words $ fromMaybe "" $ lookup "class" attr) ++ epubTypes
attribsKV = filter (\(k,_) -> k /= "class" && k /= "id") attr
epubTypes = words $ fromMaybe "" $ lookup "epub:type" attr
-- Strip namespace prefixes
stripPrefixes :: [Tag String] -> [Tag String]
stripPrefixes = map stripPrefix
stripPrefix :: Tag String -> Tag String
stripPrefix (TagOpen s as) =
TagOpen (stripPrefix' s) (map (stripPrefix' *** id) as)
stripPrefix (TagClose s) = TagClose (stripPrefix' s)
stripPrefix x = x
stripPrefix' :: String -> String
stripPrefix' s =
case span (/= ':') s of
(_, "") -> s
(_, (_:ts)) -> ts
isSpace :: Char -> Bool
isSpace ' ' = True
isSpace '\t' = True
isSpace '\n' = True
isSpace '\r' = True
isSpace _ = False
-- Instances
-- This signature should be more general
-- MonadReader HTMLLocal m => HasQuoteContext st m
instance HasQuoteContext st (Reader HTMLLocal) where
getQuoteContext = asks quoteContext
withQuoteContext q = local (\s -> s{quoteContext = q})
instance HasReaderOptions HTMLState where
extractReaderOptions = extractReaderOptions . parserState
instance Default HTMLState where
def = HTMLState def []
instance HasMeta HTMLState where
setMeta s b st = st {parserState = setMeta s b $ parserState st}
deleteMeta s st = st {parserState = deleteMeta s $ parserState st}
instance Default HTMLLocal where
def = HTMLLocal NoQuote False False
instance HasLastStrPosition HTMLState where
setLastStrPos s st = st {parserState = setLastStrPos s (parserState st)}
getLastStrPos = getLastStrPos . parserState
-- EPUB Specific
--
--
sectioningContent :: [String]
sectioningContent = ["article", "aside", "nav", "section"]
groupingContent :: [String]
groupingContent = ["p", "hr", "pre", "blockquote", "ol"
, "ul", "li", "dl", "dt", "dt", "dd"
, "figure", "figcaption", "div", "main"]
{-
types :: [(String, ([String], Int))]
types = -- Document divisions
map (\s -> (s, (["section", "body"], 0)))
["volume", "part", "chapter", "division"]
++ -- Document section and components
[
("abstract", ([], 0))]
-}
|