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
|
{-
Copyright (C) 2006-7 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.Shared
Copyright : Copyright (C) 2006-7 John MacFarlane
License : GNU GPL, version 2 or above
Maintainer : John MacFarlane <jgm@berkeley.edu>
Stability : alpha
Portability : portable
Utility functions and definitions used by the various Pandoc modules.
-}
module Text.Pandoc.Shared (
-- * List processing
splitBy,
splitByIndices,
substitute,
joinWithSep,
-- * Text processing
tabsToSpaces,
backslashEscapes,
escapeStringUsing,
stripTrailingNewlines,
removeLeadingTrailingSpace,
removeLeadingSpace,
removeTrailingSpace,
stripFirstAndLast,
camelCaseToHyphenated,
toRomanNumeral,
-- * Parsing
(>>~),
anyLine,
many1Till,
notFollowedBy',
oneOfStrings,
spaceChar,
skipSpaces,
blankline,
blanklines,
enclosed,
stringAnyCase,
parseFromString,
lineClump,
charsInBalanced,
charsInBalanced',
romanNumeral,
withHorizDisplacement,
nullBlock,
failIfStrict,
escaped,
anyOrderedListMarker,
orderedListMarker,
charRef,
readWith,
testStringWith,
ParserState (..),
defaultParserState,
Reference (..),
isNoteBlock,
isKeyBlock,
isLineClump,
HeaderType (..),
ParserContext (..),
QuoteContext (..),
NoteTable,
KeyTable,
lookupKeySrc,
refsMatch,
-- * Native format prettyprinting
prettyPandoc,
-- * Pandoc block and inline list processing
orderedListMarkers,
normalizeSpaces,
compactify,
Element (..),
hierarchicalize,
isHeaderBlock,
-- * Writer options
WriterOptions (..),
defaultWriterOptions
) where
import Text.Pandoc.Definition
import Text.ParserCombinators.Parsec
import Text.Pandoc.CharacterReferences ( characterReference )
import Data.Char ( toLower, toUpper, ord, chr, isLower, isUpper )
import Data.List ( find, groupBy, isPrefixOf, isSuffixOf )
--
-- List processing
--
-- | Split list by groups of one or more sep.
splitBy :: (Eq a) => a -> [a] -> [[a]]
splitBy _ [] = []
splitBy sep lst =
let (first, rest) = break (== sep) lst
rest' = dropWhile (== sep) rest
in first:(splitBy sep rest')
-- | Split list into chunks divided at specified indices.
splitByIndices :: [Int] -> [a] -> [[a]]
splitByIndices [] lst = [lst]
splitByIndices (x:xs) lst =
let (first, rest) = splitAt x lst in
first:(splitByIndices (map (\y -> y - x) xs) rest)
-- | Replace each occurrence of one sublist in a list with another.
substitute :: (Eq a) => [a] -> [a] -> [a] -> [a]
substitute _ _ [] = []
substitute [] _ lst = lst
substitute target replacement lst =
if target `isPrefixOf` lst
then replacement ++ (substitute target replacement $ drop (length target) lst)
else (head lst):(substitute target replacement $ tail lst)
-- | Joins a list of lists, separated by another list.
joinWithSep :: [a] -- ^ List to use as separator
-> [[a]] -- ^ Lists to join
-> [a]
joinWithSep sep [] = []
joinWithSep sep lst = foldr1 (\a b -> a ++ sep ++ b) lst
--
-- Text processing
--
-- | Convert tabs to spaces (with adjustable tab stop).
tabsToSpaces :: Int -- ^ Tabstop
-> String -- ^ String to convert
-> String
tabsToSpaces tabstop str =
unlines $ map (tabsInLine tabstop tabstop) (lines str)
-- | Convert tabs to spaces in one line.
tabsInLine :: Int -- ^ Number of spaces to next tab stop
-> Int -- ^ Tabstop
-> String -- ^ Line to convert
-> String
tabsInLine num tabstop [] = ""
tabsInLine num tabstop (c:cs) =
let (replacement, nextnum) = if c == '\t'
then (replicate num ' ', tabstop)
else if num > 1
then ([c], num - 1)
else ([c], tabstop)
in replacement ++ tabsInLine nextnum tabstop cs
-- | Returns an association list of backslash escapes for the
-- designated characters.
backslashEscapes :: [Char] -- ^ list of special characters to escape
-> [(Char, String)]
backslashEscapes = map (\ch -> (ch, ['\\',ch]))
-- | Escape a string of characters, using an association list of
-- characters and strings.
escapeStringUsing :: [(Char, String)] -> String -> String
escapeStringUsing escapeTable [] = ""
escapeStringUsing escapeTable (x:xs) =
case (lookup x escapeTable) of
Just str -> str ++ rest
Nothing -> x:rest
where rest = escapeStringUsing escapeTable xs
-- | Strip trailing newlines from string.
stripTrailingNewlines :: String -> String
stripTrailingNewlines = reverse . dropWhile (== '\n') . reverse
-- | Remove leading and trailing space (including newlines) from string.
removeLeadingTrailingSpace :: String -> String
removeLeadingTrailingSpace = removeLeadingSpace . removeTrailingSpace
-- | Remove leading space (including newlines) from string.
removeLeadingSpace :: String -> String
removeLeadingSpace = dropWhile (`elem` " \n\t")
-- | Remove trailing space (including newlines) from string.
removeTrailingSpace :: String -> String
removeTrailingSpace = reverse . removeLeadingSpace . reverse
-- | Strip leading and trailing characters from string
stripFirstAndLast :: String -> String
stripFirstAndLast str =
drop 1 $ take ((length str) - 1) str
-- | Change CamelCase word to hyphenated lowercase (e.g., camel-case).
camelCaseToHyphenated :: String -> String
camelCaseToHyphenated [] = ""
camelCaseToHyphenated (a:b:rest) | isLower a && isUpper b =
a:'-':(toLower b):(camelCaseToHyphenated rest)
camelCaseToHyphenated (a:rest) = (toLower a):(camelCaseToHyphenated rest)
-- | Convert number < 4000 to uppercase roman numeral.
toRomanNumeral :: Int -> String
toRomanNumeral x =
if x >= 4000 || x < 0
then "?"
else case x of
x | x >= 1000 -> "M" ++ toRomanNumeral (x - 1000)
x | x >= 900 -> "CM" ++ toRomanNumeral (x - 900)
x | x >= 500 -> "D" ++ toRomanNumeral (x - 500)
x | x >= 400 -> "CD" ++ toRomanNumeral (x - 400)
x | x >= 100 -> "C" ++ toRomanNumeral (x - 100)
x | x >= 90 -> "XC" ++ toRomanNumeral (x - 90)
x | x >= 50 -> "L" ++ toRomanNumeral (x - 50)
x | x >= 40 -> "XL" ++ toRomanNumeral (x - 40)
x | x >= 10 -> "X" ++ toRomanNumeral (x - 10)
x | x >= 9 -> "IX" ++ toRomanNumeral (x - 5)
x | x >= 5 -> "V" ++ toRomanNumeral (x - 5)
x | x >= 4 -> "IV" ++ toRomanNumeral (x - 4)
x | x >= 1 -> "I" ++ toRomanNumeral (x - 1)
0 -> ""
--
-- Parsing
--
-- | Like >>, but returns the operation on the left.
-- (Suggested by Tillmann Rendel on Haskell-cafe list.)
(>>~) :: (Monad m) => m a -> m b -> m a
a >>~ b = a >>= \x -> b >> return x
-- | Parse any line of text
anyLine :: GenParser Char st [Char]
anyLine = try (manyTill anyChar newline) <|> many1 anyChar
-- second alternative is for a line ending with eof
-- | Like @manyTill@, but reads at least one item.
many1Till :: GenParser tok st a
-> GenParser tok st end
-> GenParser tok st [a]
many1Till p end = do
first <- p
rest <- manyTill p end
return (first:rest)
-- | A more general form of @notFollowedBy@. This one allows any
-- type of parser to be specified, and succeeds only if that parser fails.
-- It does not consume any input.
notFollowedBy' :: Show b => GenParser a st b -> GenParser a st ()
notFollowedBy' parser = try $ (do result <- try parser
unexpected (show result))
<|> return ()
-- | Parses one of a list of strings (tried in order).
oneOfStrings :: [String] -> GenParser Char st String
oneOfStrings listOfStrings = choice $ map (try . string) listOfStrings
-- | Parses a space or tab.
spaceChar :: CharParser st Char
spaceChar = oneOf " \t"
-- | Skips zero or more spaces or tabs.
skipSpaces :: GenParser Char st ()
skipSpaces = skipMany spaceChar
-- | Skips zero or more spaces or tabs, then reads a newline.
blankline :: GenParser Char st Char
blankline = try $ skipSpaces >> newline
-- | Parses one or more blank lines and returns a string of newlines.
blanklines :: GenParser Char st [Char]
blanklines = many1 blankline
-- | Parses material enclosed between start and end parsers.
enclosed :: GenParser Char st t -- ^ start parser
-> GenParser Char st end -- ^ end parser
-> GenParser Char st a -- ^ content parser (to be used repeatedly)
-> GenParser Char st [a]
enclosed start end parser = try $
start >> notFollowedBy space >> many1Till parser (try end)
-- | Parse string, case insensitive.
stringAnyCase :: [Char] -> CharParser st String
stringAnyCase [] = string ""
stringAnyCase (x:xs) = try $ do
firstChar <- choice [ char (toUpper x), char (toLower x) ]
rest <- stringAnyCase xs
return (firstChar:rest)
-- | Parse contents of 'str' using 'parser' and return result.
parseFromString :: GenParser tok st a -> [tok] -> GenParser tok st a
parseFromString parser str = try $ do
oldInput <- getInput
setInput str
result <- parser
setInput oldInput
return result
-- | Parse raw line block up to and including blank lines.
lineClump :: GenParser Char st String
lineClump = do
lines <- many1 (notFollowedBy blankline >> anyLine)
blanks <- blanklines <|> (eof >> return "\n")
return $ (unlines lines) ++ blanks
-- | Parse a string of characters between an open character
-- and a close character, including text between balanced
-- pairs of open and close. For example,
-- @charsInBalanced '(' ')'@ will parse "(hello (there))"
-- and return "hello (there)". Stop if a blank line is
-- encountered.
charsInBalanced :: Char -> Char -> GenParser Char st String
charsInBalanced open close = try $ do
char open
raw <- manyTill ( (do res <- charsInBalanced open close
return $ [open] ++ res ++ [close])
<|> (do notFollowedBy' (blankline >> blanklines)
count 1 anyChar))
(char close)
return $ concat raw
-- | Like @charsInBalanced@, but allow blank lines in the content.
charsInBalanced' :: Char -> Char -> GenParser Char st String
charsInBalanced' open close = try $ do
char open
raw <- manyTill ( (do res <- charsInBalanced open close
return $ [open] ++ res ++ [close])
<|> count 1 anyChar)
(char close)
return $ concat raw
-- | Parses a roman numeral (uppercase or lowercase), returns number.
romanNumeral :: Bool -- ^ Uppercase if true
-> GenParser Char st Int
romanNumeral upper = try $ do
let charAnyCase c = char (if upper then toUpper c else c)
let one = charAnyCase 'i'
let five = charAnyCase 'v'
let ten = charAnyCase 'x'
let fifty = charAnyCase 'l'
let hundred = charAnyCase 'c'
let fivehundred = charAnyCase 'd'
let thousand = charAnyCase 'm'
thousands <- many thousand >>= (return . (1000 *) . length)
ninehundreds <- option 0 $ try $ hundred >> thousand >> return 900
fivehundreds <- many fivehundred >>= (return . (500 *) . length)
fourhundreds <- option 0 $ try $ hundred >> fivehundred >> return 400
hundreds <- many hundred >>= (return . (100 *) . length)
nineties <- option 0 $ try $ ten >> hundred >> return 90
fifties <- many fifty >>= (return . (50 *) . length)
forties <- option 0 $ try $ ten >> fifty >> return 40
tens <- many ten >>= (return . (10 *) . length)
nines <- option 0 $ try $ one >> ten >> return 9
fives <- many five >>= (return . (5 *) . length)
fours <- option 0 $ try $ one >> five >> return 4
ones <- many one >>= (return . length)
let total = thousands + ninehundreds + fivehundreds + fourhundreds +
hundreds + nineties + fifties + forties + tens + nines +
fives + fours + ones
if total == 0
then fail "not a roman numeral"
else return total
-- | Applies a parser, returns tuple of its results and its horizontal
-- displacement (the difference between the source column at the end
-- and the source column at the beginning). Vertical displacement
-- (source row) is ignored.
withHorizDisplacement :: GenParser Char st a -- ^ Parser to apply
-> GenParser Char st (a, Int) -- ^ (result, displacement)
withHorizDisplacement parser = do
pos1 <- getPosition
result <- parser
pos2 <- getPosition
return (result, sourceColumn pos2 - sourceColumn pos1)
-- | Parses a character and returns 'Null' (so that the parser can move on
-- if it gets stuck).
nullBlock :: GenParser Char st Block
nullBlock = anyChar >> return Null
-- | Fail if reader is in strict markdown syntax mode.
failIfStrict :: GenParser Char ParserState ()
failIfStrict = do
state <- getState
if stateStrict state then fail "strict mode" else return ()
-- | Parses backslash, then applies character parser.
escaped :: GenParser Char st Char -- ^ Parser for character to escape
-> GenParser Char st Inline
escaped parser = try $ do
char '\\'
result <- parser
return (Str [result])
-- | Parses an uppercase roman numeral and returns (UpperRoman, number).
upperRoman :: GenParser Char st (ListNumberStyle, Int)
upperRoman = do
num <- romanNumeral True
return (UpperRoman, num)
-- | Parses a lowercase roman numeral and returns (LowerRoman, number).
lowerRoman :: GenParser Char st (ListNumberStyle, Int)
lowerRoman = do
num <- romanNumeral False
return (LowerRoman, num)
-- | Parses a decimal numeral and returns (Decimal, number).
decimal :: GenParser Char st (ListNumberStyle, Int)
decimal = do
num <- many1 digit
return (Decimal, read num)
-- | Parses a '#' returns (DefaultStyle, 1).
defaultNum :: GenParser Char st (ListNumberStyle, Int)
defaultNum = do
char '#'
return (DefaultStyle, 1)
-- | Parses a lowercase letter and returns (LowerAlpha, number).
lowerAlpha :: GenParser Char st (ListNumberStyle, Int)
lowerAlpha = do
ch <- oneOf ['a'..'z']
return (LowerAlpha, ord ch - ord 'a' + 1)
-- | Parses an uppercase letter and returns (UpperAlpha, number).
upperAlpha :: GenParser Char st (ListNumberStyle, Int)
upperAlpha = do
ch <- oneOf ['A'..'Z']
return (UpperAlpha, ord ch - ord 'A' + 1)
-- | Parses a roman numeral i or I
romanOne :: GenParser Char st (ListNumberStyle, Int)
romanOne = (char 'i' >> return (LowerRoman, 1)) <|>
(char 'I' >> return (UpperRoman, 1))
-- | Parses an ordered list marker and returns list attributes.
anyOrderedListMarker :: GenParser Char st ListAttributes
anyOrderedListMarker = choice $
[delimParser numParser | delimParser <- [inPeriod, inOneParen, inTwoParens],
numParser <- [decimal, defaultNum, romanOne,
lowerAlpha, lowerRoman, upperAlpha, upperRoman]]
-- | Parses a list number (num) followed by a period, returns list attributes.
inPeriod :: GenParser Char st (ListNumberStyle, Int)
-> GenParser Char st ListAttributes
inPeriod num = try $ do
(style, start) <- num
char '.'
let delim = if style == DefaultStyle
then DefaultDelim
else Period
return (start, style, delim)
-- | Parses a list number (num) followed by a paren, returns list attributes.
inOneParen :: GenParser Char st (ListNumberStyle, Int)
-> GenParser Char st ListAttributes
inOneParen num = try $ do
(style, start) <- num
char ')'
return (start, style, OneParen)
-- | Parses a list number (num) enclosed in parens, returns list attributes.
inTwoParens :: GenParser Char st (ListNumberStyle, Int)
-> GenParser Char st ListAttributes
inTwoParens num = try $ do
char '('
(style, start) <- num
char ')'
return (start, style, TwoParens)
-- | Parses an ordered list marker with a given style and delimiter,
-- returns number.
orderedListMarker :: ListNumberStyle
-> ListNumberDelim
-> GenParser Char st Int
orderedListMarker style delim = do
let num = case style of
DefaultStyle -> decimal <|> defaultNum
Decimal -> decimal
UpperRoman -> upperRoman
LowerRoman -> lowerRoman
UpperAlpha -> upperAlpha
LowerAlpha -> lowerAlpha
let context = case delim of
DefaultDelim -> inPeriod
Period -> inPeriod
OneParen -> inOneParen
TwoParens -> inTwoParens
(start, style, delim) <- context num
return start
-- | Parses a character reference and returns a Str element.
charRef :: GenParser Char st Inline
charRef = do
c <- characterReference
return $ Str [c]
-- | Parse a string with a given parser and state.
readWith :: GenParser Char ParserState a -- ^ parser
-> ParserState -- ^ initial state
-> String -- ^ input string
-> a
readWith parser state input =
case runParser parser state "source" input of
Left err -> error $ "\nError:\n" ++ show err
Right result -> result
-- | Parse a string with @parser@ (for testing).
testStringWith :: (Show a) => GenParser Char ParserState a
-> String
-> IO ()
testStringWith parser str = putStrLn $ show $
readWith parser defaultParserState str
-- | Parsing options.
data ParserState = ParserState
{ stateParseRaw :: Bool, -- ^ Parse raw HTML and LaTeX?
stateParserContext :: ParserContext, -- ^ Inside list?
stateQuoteContext :: QuoteContext, -- ^ Inside quoted environment?
stateKeys :: KeyTable, -- ^ List of reference keys
stateNotes :: NoteTable, -- ^ List of notes
stateTabStop :: Int, -- ^ Tab stop
stateStandalone :: Bool, -- ^ Parse bibliographic info?
stateTitle :: [Inline], -- ^ Title of document
stateAuthors :: [String], -- ^ Authors of document
stateDate :: String, -- ^ Date of document
stateStrict :: Bool, -- ^ Use strict markdown syntax?
stateSmart :: Bool, -- ^ Use smart typography?
stateColumns :: Int, -- ^ Number of columns in terminal
stateHeaderTable :: [HeaderType] -- ^ Ordered list of header types used
}
deriving Show
defaultParserState :: ParserState
defaultParserState =
ParserState { stateParseRaw = False,
stateParserContext = NullState,
stateQuoteContext = NoQuote,
stateKeys = [],
stateNotes = [],
stateTabStop = 4,
stateStandalone = False,
stateTitle = [],
stateAuthors = [],
stateDate = [],
stateStrict = False,
stateSmart = False,
stateColumns = 80,
stateHeaderTable = [] }
-- | References from preliminary parsing.
data Reference
= KeyBlock [Inline] Target -- ^ Key for reference-style link (label URL title)
| NoteBlock String [Block] -- ^ Footnote reference and contents
| LineClump String -- ^ Raw clump of lines with blanks at end
deriving (Eq, Read, Show)
-- | Auxiliary functions used in preliminary parsing.
isNoteBlock :: Reference -> Bool
isNoteBlock (NoteBlock _ _) = True
isNoteBlock _ = False
isKeyBlock :: Reference -> Bool
isKeyBlock (KeyBlock _ _) = True
isKeyBlock _ = False
isLineClump :: Reference -> Bool
isLineClump (LineClump _) = True
isLineClump _ = False
data HeaderType
= SingleHeader Char -- ^ Single line of characters underneath
| DoubleHeader Char -- ^ Lines of characters above and below
deriving (Eq, Show)
data ParserContext
= ListItemState -- ^ Used when running parser on list item contents
| NullState -- ^ Default state
deriving (Eq, Show)
data QuoteContext
= InSingleQuote -- ^ Used when parsing inside single quotes
| InDoubleQuote -- ^ Used when parsing inside double quotes
| NoQuote -- ^ Used when not parsing inside quotes
deriving (Eq, Show)
type NoteTable = [(String, [Block])]
type KeyTable = [([Inline], Target)]
-- | Look up key in key table and return target object.
lookupKeySrc :: KeyTable -- ^ Key table
-> [Inline] -- ^ Key
-> Maybe Target
lookupKeySrc table key = case find (refsMatch key . fst) table of
Nothing -> Nothing
Just (_, src) -> Just src
-- | Returns @True@ if keys match (case insensitive).
refsMatch :: [Inline] -> [Inline] -> Bool
refsMatch ((Str x):restx) ((Str y):resty) =
((map toLower x) == (map toLower y)) && refsMatch restx resty
refsMatch ((Emph x):restx) ((Emph y):resty) =
refsMatch x y && refsMatch restx resty
refsMatch ((Strong x):restx) ((Strong y):resty) =
refsMatch x y && refsMatch restx resty
refsMatch ((Strikeout x):restx) ((Strikeout y):resty) =
refsMatch x y && refsMatch restx resty
refsMatch ((Superscript x):restx) ((Superscript y):resty) =
refsMatch x y && refsMatch restx resty
refsMatch ((Subscript x):restx) ((Subscript y):resty) =
refsMatch x y && refsMatch restx resty
refsMatch ((Quoted t x):restx) ((Quoted u y):resty) =
t == u && refsMatch x y && refsMatch restx resty
refsMatch ((Code x):restx) ((Code y):resty) =
((map toLower x) == (map toLower y)) && refsMatch restx resty
refsMatch ((TeX x):restx) ((TeX y):resty) =
((map toLower x) == (map toLower y)) && refsMatch restx resty
refsMatch ((HtmlInline x):restx) ((HtmlInline y):resty) =
((map toLower x) == (map toLower y)) && refsMatch restx resty
refsMatch (x:restx) (y:resty) = (x == y) && refsMatch restx resty
refsMatch [] x = null x
refsMatch x [] = null x
--
-- Native format prettyprinting
--
-- | Indent string as a block.
indentBy :: Int -- ^ Number of spaces to indent the block
-> Int -- ^ Number of spaces (rel to block) to indent first line
-> String -- ^ Contents of block to indent
-> String
indentBy num first [] = ""
indentBy num first str =
let (firstLine:restLines) = lines str
firstLineIndent = num + first
in (replicate firstLineIndent ' ') ++ firstLine ++ "\n" ++
(joinWithSep "\n" $ map ((replicate num ' ') ++ ) restLines)
-- | Prettyprint list of Pandoc blocks elements.
prettyBlockList :: Int -- ^ Number of spaces to indent list of blocks
-> [Block] -- ^ List of blocks
-> String
prettyBlockList indent [] = indentBy indent 0 "[]"
prettyBlockList indent blocks = indentBy indent (-2) $ "[ " ++
(joinWithSep "\n, " (map prettyBlock blocks)) ++ " ]"
-- | Prettyprint Pandoc block element.
prettyBlock :: Block -> String
prettyBlock (BlockQuote blocks) = "BlockQuote\n " ++
(prettyBlockList 2 blocks)
prettyBlock (OrderedList attribs blockLists) =
"OrderedList " ++ show attribs ++ "\n" ++ indentBy 2 0 ("[ " ++
(joinWithSep ", " $ map (\blocks -> prettyBlockList 2 blocks)
blockLists)) ++ " ]"
prettyBlock (BulletList blockLists) = "BulletList\n" ++
indentBy 2 0 ("[ " ++ (joinWithSep ", "
(map (\blocks -> prettyBlockList 2 blocks) blockLists))) ++ " ]"
prettyBlock (DefinitionList blockLists) = "DefinitionList\n" ++
indentBy 2 0 ("[" ++ (joinWithSep ",\n"
(map (\(term, blocks) -> " (" ++ show term ++ ",\n" ++
indentBy 1 2 (prettyBlockList 2 blocks) ++ " )") blockLists))) ++ " ]"
prettyBlock (Table caption aligns widths header rows) =
"Table " ++ show caption ++ " " ++ show aligns ++ " " ++
show widths ++ "\n" ++ prettyRow header ++ " [\n" ++
(joinWithSep ",\n" (map prettyRow rows)) ++ " ]"
where prettyRow cols = indentBy 2 0 ("[ " ++ (joinWithSep ", "
(map (\blocks -> prettyBlockList 2 blocks)
cols))) ++ " ]"
prettyBlock block = show block
-- | Prettyprint Pandoc document.
prettyPandoc :: Pandoc -> String
prettyPandoc (Pandoc meta blocks) = "Pandoc " ++ "(" ++ show meta ++
")\n" ++ (prettyBlockList 0 blocks) ++ "\n"
--
-- Pandoc block and inline list processing
--
-- | Generate infinite lazy list of markers for an ordered list,
-- depending on list attributes.
orderedListMarkers :: (Int, ListNumberStyle, ListNumberDelim) -> [String]
orderedListMarkers (start, numstyle, numdelim) =
let singleton c = [c]
seq = case numstyle of
DefaultStyle -> map show [start..]
Decimal -> map show [start..]
UpperAlpha -> drop (start - 1) $ cycle $
map singleton ['A'..'Z']
LowerAlpha -> drop (start - 1) $ cycle $
map singleton ['a'..'z']
UpperRoman -> map toRomanNumeral [start..]
LowerRoman -> map (map toLower . toRomanNumeral) [start..]
inDelim str = case numdelim of
DefaultDelim -> str ++ "."
Period -> str ++ "."
OneParen -> str ++ ")"
TwoParens -> "(" ++ str ++ ")"
in map inDelim seq
-- | Normalize a list of inline elements: remove leading and trailing
-- @Space@ elements, collapse double @Space@s into singles, and
-- remove empty Str elements.
normalizeSpaces :: [Inline] -> [Inline]
normalizeSpaces [] = []
normalizeSpaces list =
let removeDoubles [] = []
removeDoubles (Space:Space:rest) = removeDoubles (Space:rest)
removeDoubles ((Str ""):rest) = removeDoubles rest
removeDoubles (x:rest) = x:(removeDoubles rest)
removeLeading (Space:xs) = removeLeading xs
removeLeading x = x
removeTrailing [] = []
removeTrailing lst = if (last lst == Space)
then init lst
else lst
in removeLeading $ removeTrailing $ removeDoubles list
-- | Change final list item from @Para@ to @Plain@ if the list should
-- be compact.
compactify :: [[Block]] -- ^ List of list items (each a list of blocks)
-> [[Block]]
compactify [] = []
compactify items =
let final = last items
others = init items
in case final of
[Para a] -> if any containsPara others
then items
else others ++ [[Plain a]]
otherwise -> items
containsPara :: [Block] -> Bool
containsPara [] = False
containsPara ((Para a):rest) = True
containsPara ((BulletList items):rest) = any containsPara items ||
containsPara rest
containsPara ((OrderedList _ items):rest) = any containsPara items ||
containsPara rest
containsPara ((DefinitionList items):rest) = any containsPara (map snd items) ||
containsPara rest
containsPara (x:rest) = containsPara rest
-- | Data structure for defining hierarchical Pandoc documents
data Element = Blk Block
| Sec [Inline] [Element] deriving (Eq, Read, Show)
-- | Returns @True@ on Header block with at least the specified level
headerAtLeast :: Int -> Block -> Bool
headerAtLeast level (Header x _) = x <= level
headerAtLeast level _ = False
-- | Convert list of Pandoc blocks into (hierarchical) list of Elements
hierarchicalize :: [Block] -> [Element]
hierarchicalize [] = []
hierarchicalize (block:rest) =
case block of
(Header level title) ->
let (thisSection, rest') = break (headerAtLeast level) rest
in (Sec title (hierarchicalize thisSection)):(hierarchicalize rest')
x -> (Blk x):(hierarchicalize rest)
-- | True if block is a Header block.
isHeaderBlock :: Block -> Bool
isHeaderBlock (Header _ _) = True
isHeaderBlock _ = False
--
-- Writer options
--
-- | Options for writers
data WriterOptions = WriterOptions
{ writerStandalone :: Bool -- ^ Include header and footer
, writerHeader :: String -- ^ Header for the document
, writerTitlePrefix :: String -- ^ Prefix for HTML titles
, writerTabStop :: Int -- ^ Tabstop for conversion btw spaces and tabs
, writerTableOfContents :: Bool -- ^ Include table of contents
, writerS5 :: Bool -- ^ We're writing S5
, writerUseASCIIMathML :: Bool -- ^ Use ASCIIMathML
, writerASCIIMathMLURL :: Maybe String -- ^ URL to asciiMathML.js
, writerIgnoreNotes :: Bool -- ^ Ignore footnotes (used in making toc)
, writerIncremental :: Bool -- ^ Incremental S5 lists
, writerNumberSections :: Bool -- ^ Number sections in LaTeX
, writerIncludeBefore :: String -- ^ String to include before the body
, writerIncludeAfter :: String -- ^ String to include after the body
, writerStrictMarkdown :: Bool -- ^ Use strict markdown syntax
, writerReferenceLinks :: Bool -- ^ Use reference links in writing markdown, rst
} deriving Show
-- | Default writer options.
defaultWriterOptions =
WriterOptions { writerStandalone = False,
writerHeader = "",
writerTitlePrefix = "",
writerTabStop = 4,
writerTableOfContents = False,
writerS5 = False,
writerUseASCIIMathML = False,
writerASCIIMathMLURL = Nothing,
writerIgnoreNotes = False,
writerIncremental = False,
writerNumberSections = False,
writerIncludeBefore = "",
writerIncludeAfter = "",
writerStrictMarkdown = False,
writerReferenceLinks = False }
|