aboutsummaryrefslogtreecommitdiff
path: root/src/Text/Pandoc/Readers/LaTeX.hs
blob: 9f51e9a8f5688d51d799b66cab49590a526b17d1 (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
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
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
{-# LANGUAGE ScopedTypeVariables, OverloadedStrings #-}
{-
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.LaTeX
   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 LaTeX to 'Pandoc' document.
-}
module Text.Pandoc.Readers.LaTeX ( readLaTeX,
                                   rawLaTeXInline,
                                   rawLaTeXBlock,
                                   inlineCommand,
                                   handleIncludes
                                 ) where

import Text.Pandoc.Definition
import Text.Pandoc.Walk
import Text.Pandoc.Shared
import Text.Pandoc.Options
import Text.Pandoc.Parsing hiding ((<|>), many, optional, space,
                                   mathDisplay, mathInline)
import qualified Text.Pandoc.UTF8 as UTF8
import Data.Char ( chr, ord )
import Control.Monad.Trans (lift)
import Control.Monad
import Text.Pandoc.Builder
import Data.Char (isLetter, isAlphaNum)
import Control.Applicative
import Data.Monoid
import Data.Maybe (fromMaybe)
import System.Environment (getEnv)
import System.FilePath (replaceExtension, (</>))
import Data.List (intercalate, intersperse)
import qualified Data.Map as M
import qualified Control.Exception as E
import System.FilePath (takeExtension, addExtension)
import Text.Pandoc.Highlighting (fromListingsLanguage)

-- | Parse LaTeX from string and return 'Pandoc' document.
readLaTeX :: ReaderOptions -- ^ Reader options
          -> String        -- ^ String to parse (assumes @'\n'@ line endings)
          -> Pandoc
readLaTeX opts = readWith parseLaTeX def{ stateOptions = opts }

parseLaTeX :: LP Pandoc
parseLaTeX = do
  bs <- blocks
  eof
  st <- getState
  let meta = stateMeta st
  let (Pandoc _ bs') = doc bs
  return $ Pandoc meta bs'

type LP = Parser [Char] ParserState

anyControlSeq :: LP String
anyControlSeq = do
  char '\\'
  next <- option '\n' anyChar
  name <- case next of
               '\n'           -> return ""
               c | isLetter c -> (c:) <$> (many letter <* optional sp)
                 | otherwise  -> return [c]
  return name

controlSeq :: String -> LP String
controlSeq name = try $ do
  char '\\'
  case name of
        ""   -> mzero
        [c] | not (isLetter c) -> string [c]
        cs   -> string cs <* notFollowedBy letter <* optional sp
  return name

dimenarg :: LP String
dimenarg = try $ do
  ch  <- option "" $ string "="
  num <- many1 digit
  dim <- oneOfStrings ["pt","pc","in","bp","cm","mm","dd","cc","sp"]
  return $ ch ++ num ++ dim

sp :: LP ()
sp = skipMany1 $ satisfy (\c -> c == ' ' || c == '\t')
        <|> (try $ newline <* lookAhead anyChar <* notFollowedBy blankline)

isLowerHex :: Char -> Bool
isLowerHex x = x >= '0' && x <= '9' || x >= 'a' && x <= 'f'

tildeEscape :: LP Char
tildeEscape = try $ do
  string "^^"
  c <- satisfy (\x -> x >= '\0' && x <= '\128')
  d <- if isLowerHex c
          then option "" $ count 1 (satisfy isLowerHex)
          else return ""
  if null d
     then case ord c of
           x | x >= 64 && x <= 127 -> return $ chr (x - 64)
             | otherwise           -> return $ chr (x + 64)
     else return $ chr $ read ('0':'x':c:d)

comment :: LP ()
comment = do
  char '%'
  skipMany (satisfy (/='\n'))
  optional newline
  return ()

bgroup :: LP ()
bgroup = () <$ char '{'
     <|> () <$ controlSeq "bgroup"
     <|> () <$ controlSeq "begingroup"

egroup :: LP ()
egroup = () <$ char '}'
     <|> () <$ controlSeq "egroup"
     <|> () <$ controlSeq "endgroup"

grouped :: Monoid a => LP a -> LP a
grouped parser = try $ bgroup *> (mconcat <$> manyTill parser egroup)

braced :: LP String
braced = bgroup *> (concat <$> manyTill
         (  many1 (satisfy (\c -> c /= '\\' && c /= '}' && c /= '{'))
        <|> try (string "\\}")
        <|> try (string "\\{")
        <|> try (string "\\\\")
        <|> ((\x -> "{" ++ x ++ "}") <$> braced)
        <|> count 1 anyChar
         ) egroup)

bracketed :: Monoid a => LP a -> LP a
bracketed parser = try $ char '[' *> (mconcat <$> manyTill parser (char ']'))

mathDisplay :: LP String -> LP Inlines
mathDisplay p = displayMath <$> (try p >>= applyMacros' . trim)

mathInline :: LP String -> LP Inlines
mathInline p = math <$> (try p >>= applyMacros')

mathChars :: LP String
mathChars = concat <$>
  many (   many1 (satisfy (\c -> c /= '$' && c /='\\'))
      <|> (\c -> ['\\',c]) <$> (try $ char '\\' *> anyChar)
       )

quoted' :: (Inlines -> Inlines) -> LP String -> LP () -> LP Inlines
quoted' f starter ender = do
  startchs <- starter
  try ((f . mconcat) <$> manyTill inline ender) <|> lit startchs

double_quote :: LP Inlines
double_quote =
  (   quoted' doubleQuoted (try $ string "``") (void $ try $ string "''")
  <|> quoted' doubleQuoted (string "“")        (void $ char '”')
  -- the following is used by babel for localized quotes:
  <|> quoted' doubleQuoted (try $ string "\"`") (void $ try $ string "\"'")
  <|> quoted' doubleQuoted (string "\"")       (void $ char '"')
  )

single_quote :: LP Inlines
single_quote =
  (  quoted' singleQuoted (string "`") (try $ char '\'' >> notFollowedBy letter)
  <|> quoted' singleQuoted (string "‘") (try $ char '’' >> notFollowedBy letter)
  )

inline :: LP Inlines
inline = (mempty <$ comment)
     <|> (space  <$ sp)
     <|> inlineText
     <|> inlineCommand
     <|> inlineGroup
     <|> (char '-' *> option (str "-")
           ((char '-') *> option (str "–") (str "—" <$ char '-')))
     <|> double_quote
     <|> single_quote
     <|> (str "”" <$ try (string "''"))
     <|> (str "”" <$ char '”')
     <|> (str "’" <$ char '\'')
     <|> (str "’" <$ char '’')
     <|> (str "\160" <$ char '~')
     <|> (mathDisplay $ string "$$" *> mathChars <* string "$$")
     <|> (mathInline  $ char '$' *> mathChars <* char '$')
     <|> (superscript <$> (char '^' *> tok))
     <|> (subscript <$> (char '_' *> tok))
     <|> (guardEnabled Ext_literate_haskell *> char '|' *> doLHSverb)
     <|> (str . (:[]) <$> tildeEscape)
     <|> (str . (:[]) <$> oneOf "[]")
     <|> (str . (:[]) <$> oneOf "#&") -- TODO print warning?
     -- <|> (str <$> count 1 (satisfy (\c -> c /= '\\' && c /='\n' && c /='}' && c /='{'))) -- eat random leftover characters

inlines :: LP Inlines
inlines = mconcat <$> many (notFollowedBy (char '}') *> inline)

inlineGroup :: LP Inlines
inlineGroup = do
  ils <- grouped inline
  if isNull ils
     then return mempty
     else return $ spanWith nullAttr ils
          -- we need the span so we can detitlecase bibtex entries;
          -- we need to know when something is {C}apitalized

block :: LP Blocks
block = (mempty <$ comment)
    <|> (mempty <$ ((spaceChar <|> newline) *> spaces))
    <|> environment
    <|> macro
    <|> blockCommand
    <|> paragraph
    <|> grouped block
    <|> (mempty <$ char '&')  -- loose & in table environment


blocks :: LP Blocks
blocks = mconcat <$> many block

blockCommand :: LP Blocks
blockCommand = try $ do
  name <- anyControlSeq
  guard $ name /= "begin" && name /= "end"
  star <- option "" (string "*" <* optional sp)
  let name' = name ++ star
  case M.lookup name' blockCommands of
       Just p      -> p
       Nothing     -> case M.lookup name blockCommands of
                           Just p    -> p
                           Nothing   -> mzero

inBrackets :: Inlines -> Inlines
inBrackets x = (str "[") <> x <> (str "]")

-- eat an optional argument and one or more arguments in braces
ignoreInlines :: String -> (String, LP Inlines)
ignoreInlines name = (name, doraw <|> (mempty <$ optargs))
  where optargs = skipopts *> skipMany (try $ optional sp *> braced)
        contseq = '\\':name
        doraw = (rawInline "latex" . (contseq ++) . snd) <$>
                 (getOption readerParseRaw >>= guard >> (withRaw optargs))

ignoreBlocks :: String -> (String, LP Blocks)
ignoreBlocks name = (name, doraw <|> (mempty <$ optargs))
  where optargs = skipopts *> skipMany (try $ optional sp *> braced)
        contseq = '\\':name
        doraw = (rawBlock "latex" . (contseq ++) . snd) <$>
                 (getOption readerParseRaw >>= guard >> (withRaw optargs))

blockCommands :: M.Map String (LP Blocks)
blockCommands = M.fromList $
  [ ("par", mempty <$ skipopts)
  , ("title", mempty <$ (skipopts *> tok >>= addMeta "title"))
  , ("subtitle", mempty <$ (skipopts *> tok >>= addMeta "subtitle"))
  , ("author", mempty <$ (skipopts *> authors))
  -- -- in letter class, temp. store address & sig as title, author
  , ("address", mempty <$ (skipopts *> tok >>= addMeta "address"))
  , ("signature", mempty <$ (skipopts *> authors))
  , ("date", mempty <$ (skipopts *> tok >>= addMeta "date"))
  -- sectioning
  , ("chapter", updateState (\s -> s{ stateHasChapters = True })
                      *> section nullAttr 0)
  , ("chapter*", updateState (\s -> s{ stateHasChapters = True })
                      *> section ("",["unnumbered"],[]) 0)
  , ("section", section nullAttr 1)
  , ("section*", section ("",["unnumbered"],[]) 1)
  , ("subsection", section nullAttr 2)
  , ("subsection*", section ("",["unnumbered"],[]) 2)
  , ("subsubsection", section nullAttr 3)
  , ("subsubsection*", section ("",["unnumbered"],[]) 3)
  , ("paragraph", section nullAttr 4)
  , ("paragraph*", section ("",["unnumbered"],[]) 4)
  , ("subparagraph", section nullAttr 5)
  , ("subparagraph*", section ("",["unnumbered"],[]) 5)
  -- beamer slides
  , ("frametitle", section nullAttr 3)
  , ("framesubtitle", section nullAttr 4)
  -- letters
  , ("opening", (para . trimInlines) <$> (skipopts *> tok))
  , ("closing", skipopts *> closing)
  --
  , ("hrule", pure horizontalRule)
  , ("rule", skipopts *> tok *> tok *> pure horizontalRule)
  , ("item", skipopts *> loose_item)
  , ("documentclass", skipopts *> braced *> preamble)
  , ("centerline", (para . trimInlines) <$> (skipopts *> tok))
  , ("caption", skipopts *> tok >>= setCaption)
  , ("PandocStartInclude", startInclude)
  , ("PandocEndInclude", endInclude)
  , ("bibliography", mempty <$ (skipopts *> braced >>=
                                addMeta "bibliography" . splitBibs))
  , ("addbibresource", mempty <$ (skipopts *> braced >>=
                                addMeta "bibliography" . splitBibs))
  ] ++ map ignoreBlocks
  -- these commands will be ignored unless --parse-raw is specified,
  -- in which case they will appear as raw latex blocks
  [ "newcommand", "renewcommand", "newenvironment", "renewenvironment"
    -- newcommand, etc. should be parsed by macro, but we need this
    -- here so these aren't parsed as inline commands to ignore
  , "special", "pdfannot", "pdfstringdef"
  , "bibliographystyle"
  , "maketitle", "makeindex", "makeglossary"
  , "addcontentsline", "addtocontents", "addtocounter"
     -- \ignore{} is used conventionally in literate haskell for definitions
     -- that are to be processed by the compiler but not printed.
  , "ignore"
  , "hyperdef"
  , "markboth", "markright", "markleft"
  , "hspace", "vspace"
  ]

addMeta :: ToMetaValue a => String -> a -> LP ()
addMeta field val = updateState $ \st ->
  st{ stateMeta = addMetaField field val $ stateMeta st }

splitBibs :: String -> [Inlines]
splitBibs = map (str . flip replaceExtension "bib" . trim) . splitBy (==',')

setCaption :: Inlines -> LP Blocks
setCaption ils = do
  updateState $ \st -> st{ stateCaption = Just ils }
  return mempty

resetCaption :: LP ()
resetCaption = updateState $ \st -> st{ stateCaption = Nothing }

authors :: LP ()
authors = try $ do
  char '{'
  let oneAuthor = mconcat <$>
       many1 (notFollowedBy' (controlSeq "and") >>
               (inline <|> mempty <$ blockCommand))
               -- skip e.g. \vspace{10pt}
  auths <- sepBy oneAuthor (controlSeq "and")
  char '}'
  addMeta "author" (map trimInlines auths)

section :: Attr -> Int -> LP Blocks
section (ident, classes, kvs) lvl = do
  hasChapters <- stateHasChapters `fmap` getState
  let lvl' = if hasChapters then lvl + 1 else lvl
  skipopts
  contents <- grouped inline
  lab <- option ident $ try (spaces >> controlSeq "label" >> spaces >> braced)
  attr' <- registerHeader (lab, classes, kvs) contents
  return $ headerWith attr' lvl' contents

inlineCommand :: LP Inlines
inlineCommand = try $ do
  name <- anyControlSeq
  guard $ name /= "begin" && name /= "end"
  guard $ not $ isBlockCommand name
  parseRaw <- getOption readerParseRaw
  star <- option "" (string "*")
  let name' = name ++ star
  let raw = do
        rawargs <- withRaw (skipopts *> option "" dimenarg *> many braced)
        let rawcommand = '\\' : name ++ star ++ snd rawargs
        transformed <- applyMacros' rawcommand
        if transformed /= rawcommand
           then parseFromString inlines transformed
           else if parseRaw
                   then return $ rawInline "latex" rawcommand
                   else return mempty
  case M.lookup name' inlineCommands of
       Just p      -> p <|> raw
       Nothing     -> case M.lookup name inlineCommands of
                           Just p    -> p <|> raw
                           Nothing   -> raw

unlessParseRaw :: LP ()
unlessParseRaw = getOption readerParseRaw >>= guard . not

isBlockCommand :: String -> Bool
isBlockCommand s = maybe False (const True) $ M.lookup s blockCommands

inlineCommands :: M.Map String (LP Inlines)
inlineCommands = M.fromList $
  [ ("emph", extractSpaces emph <$> tok)
  , ("textit", extractSpaces emph <$> tok)
  , ("textsl", extractSpaces emph <$> tok)
  , ("textsc", extractSpaces smallcaps <$> tok)
  , ("sout", extractSpaces strikeout <$> tok)
  , ("textsuperscript", extractSpaces superscript <$> tok)
  , ("textsubscript", extractSpaces subscript <$> tok)
  , ("textbackslash", lit "\\")
  , ("backslash", lit "\\")
  , ("slash", lit "/")
  , ("textbf", extractSpaces strong <$> tok)
  , ("textnormal", extractSpaces (spanWith ("",["nodecor"],[])) <$> tok)
  , ("ldots", lit "…")
  , ("dots", lit "…")
  , ("mdots", lit "…")
  , ("sim", lit "~")
  , ("label", unlessParseRaw >> (inBrackets <$> tok))
  , ("ref", unlessParseRaw >> (inBrackets <$> tok))
  , ("(", mathInline $ manyTill anyChar (try $ string "\\)"))
  , ("[", mathDisplay $ manyTill anyChar (try $ string "\\]"))
  , ("ensuremath", mathInline $ braced)
  , ("P", lit "¶")
  , ("S", lit "§")
  , ("$", lit "$")
  , ("%", lit "%")
  , ("&", lit "&")
  , ("#", lit "#")
  , ("_", lit "_")
  , ("{", lit "{")
  , ("}", lit "}")
  -- old TeX commands
  , ("em", extractSpaces emph <$> inlines)
  , ("it", extractSpaces emph <$> inlines)
  , ("sl", extractSpaces emph <$> inlines)
  , ("bf", extractSpaces strong <$> inlines)
  , ("rm", inlines)
  , ("itshape", extractSpaces emph <$> inlines)
  , ("slshape", extractSpaces emph <$> inlines)
  , ("scshape", extractSpaces smallcaps <$> inlines)
  , ("bfseries", extractSpaces strong <$> inlines)
  , ("/", pure mempty) -- italic correction
  , ("aa", lit "å")
  , ("AA", lit "Å")
  , ("ss", lit "ß")
  , ("o", lit "ø")
  , ("O", lit "Ø")
  , ("L", lit "Ł")
  , ("l", lit "ł")
  , ("ae", lit "æ")
  , ("AE", lit "Æ")
  , ("oe", lit "œ")
  , ("OE", lit "Œ")
  , ("pounds", lit "£")
  , ("euro", lit "€")
  , ("copyright", lit "©")
  , ("textasciicircum", lit "^")
  , ("textasciitilde", lit "~")
  , ("`", option (str "`") $ try $ tok >>= accent grave)
  , ("'", option (str "'") $ try $ tok >>= accent acute)
  , ("^", option (str "^") $ try $ tok >>= accent circ)
  , ("~", option (str "~") $ try $ tok >>= accent tilde)
  , ("\"", option (str "\"") $ try $ tok >>= accent umlaut)
  , (".", option (str ".") $ try $ tok >>= accent dot)
  , ("=", option (str "=") $ try $ tok >>= accent macron)
  , ("c", option (str "c") $ try $ tok >>= accent cedilla)
  , ("v", option (str "v") $ try $ tok >>= accent hacek)
  , ("u", option (str "u") $ try $ tok >>= accent breve)
  , ("i", lit "i")
  , ("\\", linebreak <$ (optional (bracketed inline) *> optional sp))
  , (",", pure mempty)
  , ("@", pure mempty)
  , (" ", lit "\160")
  , ("ps", pure $ str "PS." <> space)
  , ("TeX", lit "TeX")
  , ("LaTeX", lit "LaTeX")
  , ("bar", lit "|")
  , ("textless", lit "<")
  , ("textgreater", lit ">")
  , ("thanks", (note . mconcat) <$> (char '{' *> manyTill block (char '}')))
  , ("footnote", (note . mconcat) <$> (char '{' *> manyTill block (char '}')))
  , ("verb", doverb)
  , ("lstinline", doverb)
  , ("Verb", doverb)
  , ("texttt", (code . stringify . toList) <$> tok)
  , ("url", (unescapeURL <$> braced) >>= \url ->
       pure (link url "" (str url)))
  , ("href", (unescapeURL <$> braced <* optional sp) >>= \url ->
       tok >>= \lab ->
         pure (link url "" lab))
  , ("includegraphics", skipopts *> (unescapeURL <$> braced) >>= mkImage)
  , ("enquote", enquote)
  , ("cite", citation "cite" AuthorInText False)
  , ("citep", citation "citep" NormalCitation False)
  , ("citep*", citation "citep*" NormalCitation False)
  , ("citeal", citation "citeal" NormalCitation False)
  , ("citealp", citation "citealp" NormalCitation False)
  , ("citealp*", citation "citealp*" NormalCitation False)
  , ("autocite", citation "autocite" NormalCitation False)
  , ("footcite", inNote <$> citation "footcite" NormalCitation False)
  , ("parencite", citation "parencite" NormalCitation False)
  , ("supercite", citation "supercite" NormalCitation False)
  , ("footcitetext", inNote <$> citation "footcitetext" NormalCitation False)
  , ("citeyearpar", citation "citeyearpar" SuppressAuthor False)
  , ("citeyear", citation "citeyear" SuppressAuthor False)
  , ("autocite*", citation "autocite*" SuppressAuthor False)
  , ("cite*", citation "cite*" SuppressAuthor False)
  , ("parencite*", citation "parencite*" SuppressAuthor False)
  , ("textcite", citation "textcite" AuthorInText False)
  , ("citet", citation "citet" AuthorInText False)
  , ("citet*", citation "citet*" AuthorInText False)
  , ("citealt", citation "citealt" AuthorInText False)
  , ("citealt*", citation "citealt*" AuthorInText False)
  , ("textcites", citation "textcites" AuthorInText True)
  , ("cites", citation "cites" NormalCitation True)
  , ("autocites", citation "autocites" NormalCitation True)
  , ("footcites", inNote <$> citation "footcites" NormalCitation True)
  , ("parencites", citation "parencites" NormalCitation True)
  , ("supercites", citation "supercites" NormalCitation True)
  , ("footcitetexts", inNote <$> citation "footcitetexts" NormalCitation True)
  , ("Autocite", citation "Autocite" NormalCitation False)
  , ("Footcite", citation "Footcite" NormalCitation False)
  , ("Parencite", citation "Parencite" NormalCitation False)
  , ("Supercite", citation "Supercite" NormalCitation False)
  , ("Footcitetext", inNote <$> citation "Footcitetext" NormalCitation False)
  , ("Citeyearpar", citation "Citeyearpar" SuppressAuthor False)
  , ("Citeyear", citation "Citeyear" SuppressAuthor False)
  , ("Autocite*", citation "Autocite*" SuppressAuthor False)
  , ("Cite*", citation "Cite*" SuppressAuthor False)
  , ("Parencite*", citation "Parencite*" SuppressAuthor False)
  , ("Textcite", citation "Textcite" AuthorInText False)
  , ("Textcites", citation "Textcites" AuthorInText True)
  , ("Cites", citation "Cites" NormalCitation True)
  , ("Autocites", citation "Autocites" NormalCitation True)
  , ("Footcites", citation "Footcites" NormalCitation True)
  , ("Parencites", citation "Parencites" NormalCitation True)
  , ("Supercites", citation "Supercites" NormalCitation True)
  , ("Footcitetexts", inNote <$> citation "Footcitetexts" NormalCitation True)
  , ("citetext", complexNatbibCitation NormalCitation)
  , ("citeauthor", (try (tok *> optional sp *> controlSeq "citetext") *>
                        complexNatbibCitation AuthorInText)
                   <|> citation "citeauthor" AuthorInText False)
  , ("nocite", mempty <$ (citation "nocite" NormalCitation False >>=
                          addMeta "nocite"))
  ] ++ map ignoreInlines
  -- these commands will be ignored unless --parse-raw is specified,
  -- in which case they will appear as raw latex blocks:
  [ "noindent", "index" ]

mkImage :: String -> LP Inlines
mkImage src = do
   let alt = str "image"
   case takeExtension src of
        "" -> do
              defaultExt <- getOption readerDefaultImageExtension
              return $ image (addExtension src defaultExt) "" alt
        _  -> return $ image src "" alt

inNote :: Inlines -> Inlines
inNote ils =
  note $ para $ ils <> str "."

unescapeURL :: String -> String
unescapeURL ('\\':x:xs) | isEscapable x = x:unescapeURL xs
  where isEscapable c = c `elem` "#$%&~_^\\{}"
unescapeURL (x:xs) = x:unescapeURL xs
unescapeURL [] = ""

enquote :: LP Inlines
enquote = do
  skipopts
  context <- stateQuoteContext <$> getState
  if context == InDoubleQuote
     then singleQuoted <$> withQuoteContext InSingleQuote tok
     else doubleQuoted <$> withQuoteContext InDoubleQuote tok

doverb :: LP Inlines
doverb = do
  marker <- anyChar
  code <$> manyTill (satisfy (/='\n')) (char marker)

doLHSverb :: LP Inlines
doLHSverb = codeWith ("",["haskell"],[]) <$> manyTill (satisfy (/='\n')) (char '|')

lit :: String -> LP Inlines
lit = pure . str

accent :: (Char -> String) -> Inlines -> LP Inlines
accent f ils =
  case toList ils of
       (Str (x:xs) : ys) -> return $ fromList $ (Str (f x ++ xs) : ys)
       []                -> mzero
       _                 -> return ils

grave :: Char -> String
grave 'A' = "À"
grave 'E' = "È"
grave 'I' = "Ì"
grave 'O' = "Ò"
grave 'U' = "Ù"
grave 'a' = "à"
grave 'e' = "è"
grave 'i' = "ì"
grave 'o' = "ò"
grave 'u' = "ù"
grave c   = [c]

acute :: Char -> String
acute 'A' = "Á"
acute 'E' = "É"
acute 'I' = "Í"
acute 'O' = "Ó"
acute 'U' = "Ú"
acute 'Y' = "Ý"
acute 'a' = "á"
acute 'e' = "é"
acute 'i' = "í"
acute 'o' = "ó"
acute 'u' = "ú"
acute 'y' = "ý"
acute 'C' = "Ć"
acute 'c' = "ć"
acute 'L' = "Ĺ"
acute 'l' = "ĺ"
acute 'N' = "Ń"
acute 'n' = "ń"
acute 'R' = "Ŕ"
acute 'r' = "ŕ"
acute 'S' = "Ś"
acute 's' = "ś"
acute 'Z' = "Ź"
acute 'z' = "ź"
acute c   = [c]

circ :: Char -> String
circ 'A' = "Â"
circ 'E' = "Ê"
circ 'I' = "Î"
circ 'O' = "Ô"
circ 'U' = "Û"
circ 'a' = "â"
circ 'e' = "ê"
circ 'i' = "î"
circ 'o' = "ô"
circ 'u' = "û"
circ 'C' = "Ĉ"
circ 'c' = "ĉ"
circ 'G' = "Ĝ"
circ 'g' = "ĝ"
circ 'H' = "Ĥ"
circ 'h' = "ĥ"
circ 'J' = "Ĵ"
circ 'j' = "ĵ"
circ 'S' = "Ŝ"
circ 's' = "ŝ"
circ 'W' = "Ŵ"
circ 'w' = "ŵ"
circ 'Y' = "Ŷ"
circ 'y' = "ŷ"
circ c   = [c]

tilde :: Char -> String
tilde 'A' = "Ã"
tilde 'a' = "ã"
tilde 'O' = "Õ"
tilde 'o' = "õ"
tilde 'I' = "Ĩ"
tilde 'i' = "ĩ"
tilde 'U' = "Ũ"
tilde 'u' = "ũ"
tilde 'N' = "Ñ"
tilde 'n' = "ñ"
tilde c   = [c]

umlaut :: Char -> String
umlaut 'A' = "Ä"
umlaut 'E' = "Ë"
umlaut 'I' = "Ï"
umlaut 'O' = "Ö"
umlaut 'U' = "Ü"
umlaut 'a' = "ä"
umlaut 'e' = "ë"
umlaut 'i' = "ï"
umlaut 'o' = "ö"
umlaut 'u' = "ü"
umlaut c   = [c]

dot :: Char -> String
dot 'C' = "Ċ"
dot 'c' = "ċ"
dot 'E' = "Ė"
dot 'e' = "ė"
dot 'G' = "Ġ"
dot 'g' = "ġ"
dot 'I' = "İ"
dot 'Z' = "Ż"
dot 'z' = "ż"
dot c   = [c]

macron :: Char -> String
macron 'A' = "Ā"
macron 'E' = "Ē"
macron 'I' = "Ī"
macron 'O' = "Ō"
macron 'U' = "Ū"
macron 'a' = "ā"
macron 'e' = "ē"
macron 'i' = "ī"
macron 'o' = "ō"
macron 'u' = "ū"
macron c   = [c]

cedilla :: Char -> String
cedilla 'c' = "ç"
cedilla 'C' = "Ç"
cedilla 's' = "ş"
cedilla 'S' = "Ş"
cedilla 't' = "ţ"
cedilla 'T' = "Ţ"
cedilla 'e' = "ȩ"
cedilla 'E' = "Ȩ"
cedilla 'h' = "ḩ"
cedilla 'H' = "Ḩ"
cedilla 'o' = "o̧"
cedilla 'O' = "O̧"
cedilla c   = [c]

hacek :: Char -> String
hacek 'A' = "Ǎ"
hacek 'a' = "ǎ"
hacek 'C' = "Č"
hacek 'c' = "č"
hacek 'D' = "Ď"
hacek 'd' = "ď"
hacek 'E' = "Ě"
hacek 'e' = "ě"
hacek 'G' = "Ǧ"
hacek 'g' = "ǧ"
hacek 'H' = "Ȟ"
hacek 'h' = "ȟ"
hacek 'I' = "Ǐ"
hacek 'i' = "ǐ"
hacek 'j' = "ǰ"
hacek 'K' = "Ǩ"
hacek 'k' = "ǩ"
hacek 'L' = "Ľ"
hacek 'l' = "ľ"
hacek 'N' = "Ň"
hacek 'n' = "ň"
hacek 'O' = "Ǒ"
hacek 'o' = "ǒ"
hacek 'R' = "Ř"
hacek 'r' = "ř"
hacek 'S' = "Š"
hacek 's' = "š"
hacek 'T' = "Ť"
hacek 't' = "ť"
hacek 'U' = "Ǔ"
hacek 'u' = "ǔ"
hacek 'Z' = "Ž"
hacek 'z' = "ž"
hacek c   = [c]

breve :: Char -> String
breve 'A' = "Ă"
breve 'a' = "ă"
breve 'E' = "Ĕ"
breve 'e' = "ĕ"
breve 'G' = "Ğ"
breve 'g' = "ğ"
breve 'I' = "Ĭ"
breve 'i' = "ĭ"
breve 'O' = "Ŏ"
breve 'o' = "ŏ"
breve 'U' = "Ŭ"
breve 'u' = "ŭ"
breve c   = [c]

tok :: LP Inlines
tok = try $ grouped inline <|> inlineCommand <|> str <$> (count 1 $ inlineChar)

opt :: LP Inlines
opt = bracketed inline <* optional sp

skipopts :: LP ()
skipopts = skipMany opt

inlineText :: LP Inlines
inlineText = str <$> many1 inlineChar

inlineChar :: LP Char
inlineChar = noneOf "\\$%^_&~#{}^'`\"‘’“”-[] \t\n"

environment :: LP Blocks
environment = do
  controlSeq "begin"
  name <- braced
  case M.lookup name environments of
       Just p      -> p <|> rawEnv name
       Nothing     -> rawEnv name

rawEnv :: String -> LP Blocks
rawEnv name = do
  let addBegin x = "\\begin{" ++ name ++ "}" ++ x
  parseRaw <- getOption readerParseRaw
  if parseRaw
     then (rawBlock "latex" . addBegin) <$>
            (withRaw (env name blocks) >>= applyMacros' . snd)
     else env name blocks

----

type IncludeParser = ParserT [Char] [String] IO String

-- | Replace "include" commands with file contents.
handleIncludes :: String -> IO String
handleIncludes s = do
  res <- runParserT includeParser' [] "input" s
  case res of
       Right s'    -> return s'
       Left e      -> error $ show e

includeParser' :: IncludeParser
includeParser' =
  concat <$> many (comment' <|> escaped' <|> blob' <|> include'
                   <|> startMarker' <|> endMarker'
                   <|> verbCmd' <|> verbatimEnv' <|> backslash')

comment' :: IncludeParser
comment' = do
  char '%'
  xs <- manyTill anyChar newline
  return ('%':xs ++ "\n")

escaped' :: IncludeParser
escaped' = try $ string "\\%" <|> string "\\\\"

verbCmd' :: IncludeParser
verbCmd' = fmap snd <$>
  withRaw $ try $ do
             string "\\verb"
             c <- anyChar
             manyTill anyChar (char c)

verbatimEnv' :: IncludeParser
verbatimEnv' = fmap snd <$>
  withRaw $ try $ do
             string "\\begin"
             name <- braced'
             guard $ name `elem` ["verbatim", "Verbatim", "lstlisting",
                                  "minted", "alltt"]
             manyTill anyChar (try $ string $ "\\end{" ++ name ++ "}")

blob' :: IncludeParser
blob' = try $ many1 (noneOf "\\%")

backslash' :: IncludeParser
backslash' = string "\\"

braced' :: IncludeParser
braced' = try $ char '{' *> manyTill (satisfy (/='}')) (char '}')

include' :: IncludeParser
include' = do
  fs' <- try $ do
              char '\\'
              name <- try (string "include")
                  <|> try (string "input")
                  <|> string "usepackage"
              -- skip options
              skipMany $ try $ char '[' *> (manyTill anyChar (char ']'))
              fs <- (map trim . splitBy (==',')) <$> braced'
              return $ if name == "usepackage"
                          then map (flip replaceExtension ".sty") fs
                          else map (flip replaceExtension ".tex") fs
  pos <- getPosition
  containers <- getState
  let fn = case containers of
                (f':_) -> f'
                []     -> "input"
  -- now process each include file in order...
  rest <- getInput
  results' <- forM fs' (\f -> do
    when (f `elem` containers) $
      fail "Include file loop!"
    contents <- lift $ readTeXFile f
    return $ "\\PandocStartInclude{" ++ f ++ "}" ++
             contents ++ "\\PandocEndInclude{" ++
             fn ++ "}{" ++ show (sourceLine pos) ++ "}{"
             ++ show (sourceColumn pos) ++ "}")
  setInput $ concat results' ++ rest
  return ""

startMarker' :: IncludeParser
startMarker' = try $ do
  string "\\PandocStartInclude"
  fn <- braced'
  updateState (fn:)
  setPosition $ newPos fn 1 1
  return $ "\\PandocStartInclude{" ++ fn ++ "}"

endMarker' :: IncludeParser
endMarker' = try $ do
  string "\\PandocEndInclude"
  fn <- braced'
  ln <- braced'
  co <- braced'
  updateState tail
  setPosition $ newPos fn (fromMaybe 1 $ safeRead ln) (fromMaybe 1 $ safeRead co)
  return $ "\\PandocEndInclude{" ++ fn ++ "}{" ++ ln ++ "}{" ++
               co ++ "}"

readTeXFile :: FilePath -> IO String
readTeXFile f = do
  texinputs <- E.catch (getEnv "TEXINPUTS") $ \(_ :: E.SomeException) ->
                   return "."
  let ds = splitBy (==':') texinputs
  readFileFromDirs ds f

readFileFromDirs :: [FilePath] -> FilePath -> IO String
readFileFromDirs [] _ = return ""
readFileFromDirs (d:ds) f =
  E.catch (UTF8.readFile $ d </> f) $ \(_ :: E.SomeException) ->
    readFileFromDirs ds f

----

keyval :: LP (String, String)
keyval = try $ do
  key <- many1 alphaNum
  val <- option "" $ char '=' >> many1 alphaNum
  skipMany spaceChar
  optional (char ',')
  skipMany spaceChar
  return (key, val)


keyvals :: LP [(String, String)]
keyvals = try $ char '[' *> manyTill keyval (char ']')

alltt :: String -> LP Blocks
alltt t = walk strToCode <$> parseFromString blocks
  (substitute " " "\\ " $ substitute "%" "\\%" $
   concat $ intersperse "\\\\\n" $ lines t)
  where strToCode (Str s) = Code nullAttr s
        strToCode x       = x

rawLaTeXBlock :: Parser [Char] ParserState String
rawLaTeXBlock = snd <$> try (withRaw (environment <|> blockCommand))

rawLaTeXInline :: Parser [Char] ParserState Inline
rawLaTeXInline = do
  raw <- (snd <$> withRaw inlineCommand) <|> (snd <$> withRaw blockCommand)
  RawInline "latex" <$> applyMacros' raw

addImageCaption :: Blocks -> LP Blocks
addImageCaption = walkM go
  where go (Image alt (src,tit)) = do
          mbcapt <- stateCaption <$> getState
          case mbcapt of
               Just ils -> return (Image (toList ils) (src, "fig:"))
               Nothing  -> return (Image alt (src,tit))
        go x = return x

addTableCaption :: Blocks -> LP Blocks
addTableCaption = walkM go
  where go (Table c als ws hs rs) = do
          mbcapt <- stateCaption <$> getState
          case mbcapt of
               Just ils -> return (Table (toList ils) als ws hs rs)
               Nothing  -> return (Table c als ws hs rs)
        go x = return x

environments :: M.Map String (LP Blocks)
environments = M.fromList
  [ ("document", env "document" blocks <* skipMany anyChar)
  , ("letter", env "letter" letter_contents)
  , ("figure", env "figure" $
         resetCaption *> skipopts *> blocks >>= addImageCaption)
  , ("center", env "center" blocks)
  , ("table",  env "table" $
         resetCaption *> skipopts *> blocks >>= addTableCaption)
  , ("tabular", env "tabular" simpTable)
  , ("quote", blockQuote <$> env "quote" blocks)
  , ("quotation", blockQuote <$> env "quotation" blocks)
  , ("verse", blockQuote <$> env "verse" blocks)
  , ("itemize", bulletList <$> listenv "itemize" (many item))
  , ("description", definitionList <$> listenv "description" (many descItem))
  , ("enumerate", ordered_list)
  , ("alltt", alltt =<< verbEnv "alltt")
  , ("code", guardEnabled Ext_literate_haskell *>
      (codeBlockWith ("",["sourceCode","literate","haskell"],[]) <$>
        verbEnv "code"))
  , ("verbatim", codeBlock <$> (verbEnv "verbatim"))
  , ("Verbatim",   do options <- option [] keyvals
                      let kvs = [ (if k == "firstnumber"
                                      then "startFrom"
                                      else k, v) | (k,v) <- options ]
                      let classes = [ "numberLines" |
                                      lookup "numbers" options == Just "left" ]
                      let attr = ("",classes,kvs)
                      codeBlockWith attr <$> (verbEnv "Verbatim"))
  , ("lstlisting", do options <- option [] keyvals
                      let kvs = [ (if k == "firstnumber"
                                      then "startFrom"
                                      else k, v) | (k,v) <- options ]
                      let classes = [ "numberLines" |
                                      lookup "numbers" options == Just "left" ]
                                 ++ maybe [] (:[]) (lookup "language" options
                                         >>= fromListingsLanguage)
                      let attr = (fromMaybe "" (lookup "label" options),classes,kvs)
                      codeBlockWith attr <$> (verbEnv "lstlisting"))
  , ("minted",     do options <- option [] keyvals
                      lang <- grouped (many1 $ satisfy (/='}'))
                      let kvs = [ (if k == "firstnumber"
                                      then "startFrom"
                                      else k, v) | (k,v) <- options ]
                      let classes = [ lang | not (null lang) ] ++
                                    [ "numberLines" |
                                      lookup "linenos" options == Just "true" ]
                      let attr = ("",classes,kvs)
                      codeBlockWith attr <$> (verbEnv "minted"))
  , ("obeylines", parseFromString
                  (para . trimInlines . mconcat <$> many inline) =<<
                  intercalate "\\\\\n" . lines <$> verbEnv "obeylines")
  , ("displaymath", mathEnv Nothing "displaymath")
  , ("equation", mathEnv Nothing "equation")
  , ("equation*", mathEnv Nothing "equation*")
  , ("gather", mathEnv (Just "gathered") "gather")
  , ("gather*", mathEnv (Just "gathered") "gather*")
  , ("multline", mathEnv (Just "gathered") "multline")
  , ("multline*", mathEnv (Just "gathered") "multline*")
  , ("eqnarray", mathEnv (Just "aligned") "eqnarray")
  , ("eqnarray*", mathEnv (Just "aligned") "eqnarray*")
  , ("align", mathEnv (Just "aligned") "align")
  , ("align*", mathEnv (Just "aligned") "align*")
  , ("alignat", mathEnv (Just "aligned") "alignat")
  , ("alignat*", mathEnv (Just "aligned") "alignat*")
  ]

letter_contents :: LP Blocks
letter_contents = do
  bs <- blocks
  st <- getState
  -- add signature (author) and address (title)
  let addr = case lookupMeta "address" (stateMeta st) of
                  Just (MetaBlocks [Plain xs]) ->
                     para $ trimInlines $ fromList xs
                  _ -> mempty
  return $ addr <> bs -- sig added by \closing

closing :: LP Blocks
closing = do
  contents <- tok
  st <- getState
  let extractInlines (MetaBlocks [Plain ys]) = ys
      extractInlines (MetaBlocks [Para ys ]) = ys
      extractInlines _          = []
  let sigs = case lookupMeta "author" (stateMeta st) of
                  Just (MetaList xs) ->
                    para $ trimInlines $ fromList $
                      intercalate [LineBreak] $ map extractInlines xs
                  _ -> mempty
  return $ para (trimInlines contents) <> sigs

item :: LP Blocks
item = blocks *> controlSeq "item" *> skipopts *> blocks

loose_item :: LP Blocks
loose_item = do
  ctx <- stateParserContext `fmap` getState
  if ctx == ListItemState
     then mzero
     else return mempty

descItem :: LP (Inlines, [Blocks])
descItem = do
  blocks -- skip blocks before item
  controlSeq "item"
  optional sp
  ils <- opt
  bs <- blocks
  return (ils, [bs])

env :: String -> LP a -> LP a
env name p = p <*
  (try (controlSeq "end" *> braced >>= guard . (== name))
    <?> ("\\end{" ++ name ++ "}"))

listenv :: String -> LP a -> LP a
listenv name p = try $ do
  oldCtx <- stateParserContext `fmap` getState
  updateState $ \st -> st{ stateParserContext = ListItemState }
  res <- env name p
  updateState $ \st -> st{ stateParserContext = oldCtx }
  return res

mathEnv :: Maybe String -> String -> LP Blocks
mathEnv innerEnv name = para <$> mathDisplay (inner <$> verbEnv name)
   where inner x = case innerEnv of
                      Nothing -> x
                      Just y  -> "\\begin{" ++ y ++ "}\n" ++ x ++
                                    "\\end{" ++ y ++ "}"

verbEnv :: String -> LP String
verbEnv name = do
  skipopts
  optional blankline
  let endEnv = try $ controlSeq "end" *> braced >>= guard . (== name)
  res <- manyTill anyChar endEnv
  return $ stripTrailingNewlines res

ordered_list :: LP Blocks
ordered_list = do
  optional sp
  (_, style, delim) <- option (1, DefaultStyle, DefaultDelim) $
                              try $ char '[' *> anyOrderedListMarker <* char ']'
  spaces
  optional $ try $ controlSeq "setlength" *> grouped (controlSeq "itemindent") *> braced
  spaces
  start <- option 1 $ try $ do controlSeq "setcounter"
                               grouped (string "enum" *> many1 (oneOf "iv"))
                               optional sp
                               num <- grouped (many1 digit)
                               spaces
                               return $ (read num + 1 :: Int)
  bs <- listenv "enumerate" (many item)
  return $ orderedListWith (start, style, delim) bs

paragraph :: LP Blocks
paragraph = do
  x <- trimInlines . mconcat <$> many1 inline
  if x == mempty
     then return mempty
     else return $ para x

preamble :: LP Blocks
preamble = mempty <$> manyTill preambleBlock beginDoc
  where beginDoc = lookAhead $ try $ controlSeq "begin" *> string "{document}"
        preambleBlock =  (void comment)
                     <|> (void sp)
                     <|> (void blanklines)
                     <|> (void macro)
                     <|> (void blockCommand)
                     <|> (void anyControlSeq)
                     <|> (void braced)
                     <|> (void anyChar)

-------

-- citations

addPrefix :: [Inline] -> [Citation] -> [Citation]
addPrefix p (k:ks)   = k {citationPrefix = p ++ citationPrefix k} : ks
addPrefix _ _ = []

addSuffix :: [Inline] -> [Citation] -> [Citation]
addSuffix s ks@(_:_) =
  let k = last ks
  in  init ks ++ [k {citationSuffix = citationSuffix k ++ s}]
addSuffix _ _ = []

simpleCiteArgs :: LP [Citation]
simpleCiteArgs = try $ do
  first  <- optionMaybe $ toList <$> opt
  second <- optionMaybe $ toList <$> opt
  char '{'
  optional sp
  keys <- manyTill citationLabel (char '}')
  let (pre, suf) = case (first  , second ) of
        (Just s , Nothing) -> (mempty, s )
        (Just s , Just t ) -> (s , t )
        _                  -> (mempty, mempty)
      conv k = Citation { citationId      = k
                        , citationPrefix  = []
                        , citationSuffix  = []
                        , citationMode    = NormalCitation
                        , citationHash    = 0
                        , citationNoteNum = 0
                        }
  return $ addPrefix pre $ addSuffix suf $ map conv keys

citationLabel :: LP String
citationLabel  = optional sp *>
  (many1 (satisfy isBibtexKeyChar)
          <* optional sp
          <* optional (char ',')
          <* optional sp)
  where isBibtexKeyChar c = isAlphaNum c || c `elem` ".:;?!`'()/*@_+=-[]*"

cites :: CitationMode -> Bool -> LP [Citation]
cites mode multi = try $ do
  cits <- if multi
             then many1 simpleCiteArgs
             else count 1 simpleCiteArgs
  let cs = concat cits
  return $ case mode of
        AuthorInText -> case cs of
                             (c:rest) -> c {citationMode = mode} : rest
                             []       -> []
        _            -> map (\a -> a {citationMode = mode}) cs

citation :: String -> CitationMode -> Bool -> LP Inlines
citation name mode multi = do
  (c,raw) <- withRaw $ cites mode multi
  return $ cite c (rawInline "latex" $ "\\" ++ name ++ raw)

complexNatbibCitation :: CitationMode -> LP Inlines
complexNatbibCitation mode = try $ do
  let ils = (toList . trimInlines . mconcat) <$>
              many (notFollowedBy (oneOf "\\};") >> inline)
  let parseOne = try $ do
                   skipSpaces
                   pref  <- ils
                   cit' <- inline -- expect a citation
                   let citlist = toList cit'
                   cits' <- case citlist of
                                 [Cite cs _] -> return cs
                                 _           -> mzero
                   suff  <- ils
                   skipSpaces
                   optional $ char ';'
                   return $ addPrefix pref $ addSuffix suff $ cits'
  (c:cits, raw) <- withRaw $ grouped parseOne
  return $ cite (c{ citationMode = mode }:cits)
           (rawInline "latex" $ "\\citetext" ++ raw)

-- tables

parseAligns :: LP [Alignment]
parseAligns = try $ do
  char '{'
  let maybeBar = skipMany $ sp <|> () <$ char '|' <|> () <$ try (string "@{}")
  maybeBar
  let cAlign = AlignCenter <$ char 'c'
  let lAlign = AlignLeft <$ char 'l'
  let rAlign = AlignRight <$ char 'r'
  let parAlign = AlignLeft <$ (char 'p' >> braced)
  let alignChar = cAlign <|> lAlign <|> rAlign <|> parAlign
  aligns' <- sepEndBy alignChar maybeBar
  spaces
  char '}'
  spaces
  return aligns'

hline :: LP ()
hline = () <$ (try $ spaces >> controlSeq "hline")

lbreak :: LP ()
lbreak = () <$ (try $ spaces *> controlSeq "\\")

amp :: LP ()
amp = () <$ (try $ spaces *> char '&')

parseTableRow :: Int  -- ^ number of columns
              -> LP [Blocks]
parseTableRow cols = try $ do
  let tableCellInline = notFollowedBy (amp <|> lbreak) >> inline
  let tableCell = (plain . trimInlines . mconcat) <$> many tableCellInline
  cells' <- sepBy1 tableCell amp
  let numcells = length cells'
  guard $ numcells <= cols && numcells >= 1
  guard $ cells' /= [mempty]
  -- note:  a & b in a three-column table leaves an empty 3rd cell:
  let cells'' = cells' ++ replicate (cols - numcells) mempty
  spaces
  return cells''

simpTable :: LP Blocks
simpTable = try $ do
  spaces
  aligns <- parseAligns
  let cols = length aligns
  optional hline
  header' <- option [] $ try (parseTableRow cols <* lbreak <* hline)
  rows <- sepEndBy (parseTableRow cols) (lbreak <* optional hline)
  spaces
  skipMany (comment *> spaces)
  let header'' = if null header'
                    then replicate cols mempty
                    else header'
  lookAhead $ controlSeq "end" -- make sure we're at end
  return $ table mempty (zip aligns (repeat 0)) header'' rows

startInclude :: LP Blocks
startInclude = do
  fn <- braced
  setPosition $ newPos fn 1 1
  return mempty

endInclude :: LP Blocks
endInclude = do
  fn <- braced
  ln <- braced
  co <- braced
  setPosition $ newPos fn (fromMaybe 1 $ safeRead ln) (fromMaybe 1 $ safeRead co)
  return mempty