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
|
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE GeneralizedNewtypeDeriving #-}
{-
Copyright (C) 2018 Yan Pashkovsky <yanp.bugz@gmail.com>
and John MacFarlane
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.Roff
Copyright : Copyright (C) 2018 Yan Pashkovsky and John MacFarlane
License : GNU GPL, version 2 or above
Maintainer : Yan Pashkovsky <yanp.bugz@gmail.com>
Stability : WIP
Portability : portable
Tokenizer for roff formats (man, ms).
-}
module Text.Pandoc.Readers.Roff
( FontSpec(..)
, defaultFontSpec
, LinePart(..)
, Arg
, TableOption
, CellFormat(..)
, TableRow
, RoffToken(..)
, RoffTokens(..)
, linePartsToString
, lexRoff
)
where
import Prelude
import Safe (lastDef)
import Control.Monad (void, mzero, mplus, guard)
import Control.Monad.Except (throwError)
import Text.Pandoc.Class
(getResourcePath, readFileFromDirs, PandocMonad(..), report)
import Data.Char (isLower, toLower, toUpper, chr,
isAscii, isAlphaNum, isSpace)
import Data.Default (Default)
import qualified Data.Map as M
import Data.List (intercalate)
import qualified Data.Text as T
import Text.Pandoc.Logging (LogMessage(..))
import Text.Pandoc.Options
import Text.Pandoc.Parsing
import Text.Pandoc.Shared (safeRead, substitute)
import Text.Parsec hiding (tokenPrim)
import qualified Text.Parsec as Parsec
import Text.Pandoc.RoffChar (characterCodes, combiningAccents)
import qualified Data.Sequence as Seq
import qualified Data.Foldable as Foldable
import qualified Data.Text.Normalize as Normalize
-- import Debug.Trace (traceShowId)
--
-- Data Types
--
data FontSpec = FontSpec{ fontBold :: Bool
, fontItalic :: Bool
, fontMonospace :: Bool
} deriving (Show, Eq, Ord)
defaultFontSpec :: FontSpec
defaultFontSpec = FontSpec False False False
data LinePart = RoffStr String
| Font FontSpec
| MacroArg Int
deriving Show
type Arg = [LinePart]
type TableOption = (String, String)
data CellFormat =
CellFormat
{ columnType :: Char
, pipePrefix :: Bool
, pipeSuffix :: Bool
, columnSuffixes :: [String]
} deriving (Show, Eq, Ord)
type TableRow = ([CellFormat], [RoffTokens])
data RoffToken = TextLine [LinePart]
| EmptyLine
| ControlLine String [Arg] SourcePos
| Tbl [TableOption] [TableRow] SourcePos
deriving Show
newtype RoffTokens = RoffTokens { unRoffTokens :: Seq.Seq RoffToken }
deriving (Show, Semigroup, Monoid)
singleTok :: RoffToken -> RoffTokens
singleTok t = RoffTokens (Seq.singleton t)
data RoffMode = NormalMode
| CopyMode
deriving Show
data RoffState = RoffState { customMacros :: M.Map String RoffTokens
, prevFont :: FontSpec
, currentFont :: FontSpec
, tableTabChar :: Char
, roffMode :: RoffMode
, lastExpression :: Maybe Bool
, afterConditional :: Bool
} deriving Show
instance Default RoffState where
def = RoffState { customMacros = M.fromList
$ map (\(n, s) ->
(n, singleTok
(TextLine [RoffStr s])))
[ ("Tm", "\x2122")
, ("lq", "\x201C")
, ("rq", "\x201D")
, ("R", "\x00AE") ]
, prevFont = defaultFontSpec
, currentFont = defaultFontSpec
, tableTabChar = '\t'
, roffMode = NormalMode
, lastExpression = Nothing
, afterConditional = False
}
type RoffLexer m = ParserT [Char] RoffState m
--
-- Lexer: String -> RoffToken
--
eofline :: Stream s m Char => ParsecT s u m ()
eofline = void newline <|> eof
spacetab :: Stream s m Char => ParsecT s u m Char
spacetab = char ' ' <|> char '\t'
characterCodeMap :: M.Map String Char
characterCodeMap =
M.fromList $ map (\(x,y) -> (y,x)) characterCodes
combiningAccentsMap :: M.Map String Char
combiningAccentsMap =
M.fromList $ map (\(x,y) -> (y,x)) combiningAccents
escape :: PandocMonad m => RoffLexer m [LinePart]
escape = do
backslash
escapeGlyph <|> escapeNormal
escapeGlyph :: PandocMonad m => RoffLexer m [LinePart]
escapeGlyph = do
c <- lookAhead (oneOf ['[','('])
escapeArg >>= resolveGlyph c
resolveGlyph :: PandocMonad m => Char -> String -> RoffLexer m [LinePart]
resolveGlyph delimChar glyph = do
let cs = substitute "_u" " u" glyph -- unicode glyphs separated by _
(case words cs of
[] -> mzero
[s] -> case M.lookup s characterCodeMap `mplus` readUnicodeChar s of
Nothing -> mzero
Just c -> return [RoffStr [c]]
(s:ss) -> do
basechar <- case M.lookup s characterCodeMap `mplus`
readUnicodeChar s of
Nothing ->
case s of
[ch] | isAscii ch && isAlphaNum ch ->
return ch
_ -> mzero
Just c -> return c
let addAccents [] xs = return $ T.unpack .
Normalize.normalize Normalize.NFC .
T.pack $ reverse xs
addAccents (a:as) xs =
case M.lookup a combiningAccentsMap `mplus` readUnicodeChar a of
Just x -> addAccents as (x:xs)
Nothing -> mzero
addAccents ss [basechar] >>= \xs -> return [RoffStr xs])
<|> case delimChar of
'[' -> escUnknown ("\\[" ++ glyph ++ "]")
'(' -> escUnknown ("\\(" ++ glyph)
'\'' -> escUnknown ("\\C'" ++ glyph ++ "'")
_ -> fail "resolveGlyph: unknown glyph delimiter"
readUnicodeChar :: String -> Maybe Char
readUnicodeChar ('u':cs@(_:_:_:_:_)) =
case safeRead ('0':'x':cs) of
Just i -> Just (chr i)
Nothing -> Nothing
readUnicodeChar _ = Nothing
escapeNormal :: PandocMonad m => RoffLexer m [LinePart]
escapeNormal = do
c <- anyChar
optional expandString
case c of
' ' -> return [RoffStr " "]
'"' -> mempty <$ skipMany (satisfy (/='\n')) -- line comment
'#' -> mempty <$ manyTill anyChar newline
'%' -> return mempty -- optional hyphenation
'&' -> return mempty -- nonprintable zero-width
')' -> return mempty -- nonprintable zero-width
'*' -> escString
',' -> return mempty -- to fix spacing after roman
'-' -> return [RoffStr "-"]
'.' -> return [RoffStr "`"]
'/' -> return mempty -- to fix spacing before roman
'0' -> return [RoffStr "\x2007"] -- digit-width space
':' -> return mempty -- zero-width break
'A' -> quoteArg >>= checkDefined
'B' -> escIgnore 'B' [quoteArg]
'C' -> quoteArg >>= resolveGlyph '\''
'D' -> escIgnore 'D' [quoteArg]
'E' -> do
mode <- roffMode <$> getState
case mode of
CopyMode -> return mempty
NormalMode -> return [RoffStr "\\"]
'H' -> escIgnore 'H' [quoteArg]
'L' -> escIgnore 'L' [quoteArg]
'M' -> escIgnore 'M' [escapeArg, count 1 (satisfy (/='\n'))]
'N' -> escIgnore 'N' [quoteArg]
'O' -> escIgnore 'O' [count 1 (oneOf ['0','1'])]
'R' -> escIgnore 'R' [quoteArg]
'S' -> escIgnore 'S' [quoteArg]
'V' -> escIgnore 'V' [escapeArg, count 1 alphaNum]
'X' -> escIgnore 'X' [quoteArg]
'Y' -> escIgnore 'Y' [escapeArg, count 1 (satisfy (/='\n'))]
'Z' -> escIgnore 'Z' [quoteArg]
'\'' -> return [RoffStr "`"]
'\n' -> return mempty -- line continuation
'^' -> return [RoffStr "\x200A"] -- 1/12 em space
'_' -> return [RoffStr "_"]
'`' -> return [RoffStr "`"]
'a' -> return mempty -- "non-interpreted leader character"
'b' -> escIgnore 'b' [quoteArg]
'c' -> return mempty -- interrupt text processing
'd' -> escIgnore 'd' [] -- forward down 1/2em
'e' -> return [RoffStr "\\"]
'f' -> escFont
'g' -> escIgnore 'g' [escapeArg, count 1 (satisfy (/='\n'))]
'h' -> escIgnore 'h' [quoteArg]
'k' -> escIgnore 'k' [escapeArg, count 1 (satisfy (/='\n'))]
'l' -> escIgnore 'l' [quoteArg]
'm' -> escIgnore 'm' [escapeArg, count 1 (satisfy (/='\n'))]
'n' -> escIgnore 'm' [escapeArg, count 1 (satisfy (/='\n'))]
'o' -> escIgnore 'o' [quoteArg]
'p' -> escIgnore 'p' []
'r' -> escIgnore 'r' []
's' -> escIgnore 's' [escapeArg, signedNumber]
't' -> return [RoffStr "\t"]
'u' -> escIgnore 'u' []
'v' -> escIgnore 'v' [quoteArg]
'w' -> escIgnore 'w' [quoteArg]
'x' -> escIgnore 'x' [quoteArg]
'z' -> escIgnore 'z' [count 1 anyChar]
'{' -> return mempty
'|' -> return [RoffStr "\x2006"] --1/6 em space
'}' -> return mempty
'~' -> return [RoffStr "\160"] -- nonbreaking space
'\\' -> do
mode <- roffMode <$> getState
case mode of
CopyMode -> char '\\'
NormalMode -> return '\\'
return [RoffStr "\\"]
_ -> return [RoffStr [c]]
-- man 7 groff: "If a backslash is followed by a character that
-- does not constitute a defined escape sequence, the backslash
-- is silently ignored and the character maps to itself."
escIgnore :: PandocMonad m
=> Char
-> [RoffLexer m String]
-> RoffLexer m [LinePart]
escIgnore c argparsers = do
pos <- getPosition
arg <- snd <$> withRaw (choice argparsers) <|> return ""
report $ SkippedContent ('\\':c:arg) pos
return mempty
escUnknown :: PandocMonad m => String -> RoffLexer m [LinePart]
escUnknown s = do
pos <- getPosition
report $ SkippedContent s pos
return [RoffStr "\xFFFD"]
signedNumber :: PandocMonad m => RoffLexer m String
signedNumber = try $ do
sign <- option "" ("-" <$ char '-' <|> "" <$ char '+')
ds <- many1 digit
return (sign ++ ds)
-- Parses: [..] or (..
escapeArg :: PandocMonad m => RoffLexer m String
escapeArg = choice
[ char '[' *> optional expandString *>
manyTill (noneOf ['\n',']']) (char ']')
, char '(' *> optional expandString *>
count 2 (satisfy (/='\n'))
]
expandString :: PandocMonad m => RoffLexer m ()
expandString = try $ do
pos <- getPosition
char '\\'
char '*'
cs <- escapeArg <|> count 1 anyChar
s <- linePartsToString <$> resolveString cs pos
getInput >>= setInput . (s ++)
return ()
-- Parses: '..'
quoteArg :: PandocMonad m => RoffLexer m String
quoteArg = char '\'' *> manyTill (noneOf ['\n','\'']) (char '\'')
escFont :: PandocMonad m => RoffLexer m [LinePart]
escFont = do
font <- escapeArg <|> count 1 alphaNum
font' <- if null font || font == "P"
then prevFont <$> getState
else return $ foldr processFontLetter defaultFontSpec font
modifyState $ \st -> st{ prevFont = currentFont st
, currentFont = font' }
return [Font font']
where
processFontLetter c fs
| isLower c = processFontLetter (toUpper c) fs
processFontLetter 'B' fs = fs{ fontBold = True }
processFontLetter 'I' fs = fs{ fontItalic = True }
processFontLetter 'C' fs = fs{ fontMonospace = True }
processFontLetter _ fs = fs -- do nothing
-- separate function from lexMacro since real man files sometimes do not
-- follow the rules
lexComment :: PandocMonad m => RoffLexer m RoffTokens
lexComment = do
try $ string ".\\\""
many Parsec.space
skipMany $ noneOf "\n"
eofline
return mempty
lexMacro :: PandocMonad m => RoffLexer m RoffTokens
lexMacro = do
pos <- getPosition
st <- getState
guard $ sourceColumn pos == 1 || afterConditional st
char '.' <|> char '\''
skipMany spacetab
macroName <- many (satisfy (not . isSpace))
case macroName of
"nop" -> return mempty
"ie" -> lexConditional "ie"
"if" -> lexConditional "if"
"el" -> lexConditional "el"
_ -> do
args <- lexArgs
case macroName of
"" -> return mempty
"\\\"" -> return mempty
"\\#" -> return mempty
"TS" -> lexTable pos
"de" -> lexMacroDef args
"de1" -> lexMacroDef args
"ds" -> lexStringDef args
"ds1" -> lexStringDef args
"sp" -> return $ singleTok EmptyLine
"so" -> lexIncludeFile args
_ -> resolveMacro macroName args pos
lexTable :: PandocMonad m => SourcePos -> RoffLexer m RoffTokens
lexTable pos = do
skipMany lexComment
spaces
opts <- option [] $ try $ tableOptions <* char ';'
case lookup "tab" opts of
Just (c:_) -> modifyState $ \st -> st{ tableTabChar = c }
_ -> modifyState $ \st -> st{ tableTabChar = '\t' }
spaces
skipMany lexComment
spaces
rows <- lexTableRows
morerows <- many $ try $ do
string ".T&"
skipMany spacetab
newline
lexTableRows
string ".TE"
skipMany spacetab
eofline
return $ singleTok $ Tbl opts (rows ++ concat morerows) pos
lexTableRows :: PandocMonad m => RoffLexer m [TableRow]
lexTableRows = do
aligns <- tableFormatSpec
spaces
skipMany $ lexComment
<|> try (mempty <$ (string ".sp" >> skipMany spaceChar >> newline))
spaces
rows <- many (notFollowedBy (try (string ".TE") <|> try (string ".T&")) >>
tableRow)
return $ zip aligns rows
tableCell :: PandocMonad m => RoffLexer m RoffTokens
tableCell = do
pos <- getPosition
(enclosedCell <|> simpleCell) >>= lexRoff pos . T.pack
where
enclosedCell = do
try (string "T{")
manyTill anyChar (try (string "T}"))
simpleCell = do
tabChar <- tableTabChar <$> getState
many (notFollowedBy (char tabChar <|> newline) >> anyChar)
tableRow :: PandocMonad m => RoffLexer m [RoffTokens]
tableRow = do
tabChar <- tableTabChar <$> getState
c <- tableCell
cs <- many $ try (char tabChar >> tableCell)
skipMany spacetab
eofline
skipMany lexComment
return (c:cs)
tableOptions :: PandocMonad m => RoffLexer m [TableOption]
tableOptions = many tableOption <* spaces
tableOption :: PandocMonad m => RoffLexer m TableOption
tableOption = do
k <- many1 letter
v <- option "" $ try $ do
skipMany spacetab
char '('
manyTill anyChar (char ')')
skipMany spacetab
optional (char ',' >> skipMany spacetab)
return (k,v)
tableFormatSpec :: PandocMonad m => RoffLexer m [[CellFormat]]
tableFormatSpec = do
first <- tableFormatSpecLine
rest <- many $ try $ (newline <|> char ',') *> tableFormatSpecLine
let speclines = first:rest
spaces
char '.'
return $ speclines ++ repeat (lastDef [] speclines) -- last line is default
tableFormatSpecLine :: PandocMonad m => RoffLexer m [CellFormat]
tableFormatSpecLine =
many1 $ try $ skipMany spacetab *> tableColFormat <* skipMany spacetab
tableColFormat :: PandocMonad m => RoffLexer m CellFormat
tableColFormat = do
pipePrefix' <- option False
$ True <$ try (string "|" <* notFollowedBy spacetab)
c <- oneOf ['a','A','c','C','l','L','n','N','r','R','s','S','^','_','-',
'=','|']
suffixes <- many $ try (skipMany spacetab *> count 1 digit) <|>
(do x <- oneOf ['b','B','d','D','e','E','f','F','i','I','m','M',
'p','P','t','T','u','U','v','V','w','W','x','X', 'z','Z']
num <- case toLower x of
'w' -> many1 digit <|>
do char '('
xs <- manyTill anyChar (char ')')
return ("(" ++ xs ++ ")")
'f' -> count 1 alphaNum <* skipMany spacetab
'm' -> count 1 alphaNum <* skipMany spacetab
_ -> return ""
return $ x : num)
pipeSuffix' <- option False $ True <$ string "|"
return $ CellFormat
{ columnType = c
, pipePrefix = pipePrefix'
, pipeSuffix = pipeSuffix'
, columnSuffixes = suffixes }
-- We don't fully handle the conditional. But we do
-- include everything under '.ie n', which occurs commonly
-- in man pages.
lexConditional :: PandocMonad m => String -> RoffLexer m RoffTokens
lexConditional mname = do
pos <- getPosition
skipMany spacetab
mbtest <- if mname == "el"
then fmap not . lastExpression <$> getState
else expression
skipMany spacetab
st <- getState -- save state, so we can reset it
ifPart <- lexGroup <|> ((try (char '\\' >> newline)) >> manToken)
<|> do modifyState $ \s -> s{ afterConditional = True }
t <- manToken
modifyState $ \s -> s{ afterConditional = False }
return t
case mbtest of
Nothing -> do
putState st -- reset state, so we don't record macros in skipped section
report $ SkippedContent ('.':mname) pos
return mempty
Just True -> return ifPart
Just False -> do
putState st
return mempty
expression :: PandocMonad m => RoffLexer m (Maybe Bool)
expression = do
raw <- charsInBalanced '(' ')' (satisfy (/= '\n'))
<|> many1 nonspaceChar
returnValue $
case raw of
"1" -> Just True
"n" -> Just True -- nroff mode
"t" -> Just False -- troff mode
_ -> Nothing
where
returnValue v = do
modifyState $ \st -> st{ lastExpression = v }
return v
lexGroup :: PandocMonad m => RoffLexer m RoffTokens
lexGroup = do
groupstart
mconcat <$> manyTill manToken groupend
where
groupstart = try $ string "\\{\\" >> newline
groupend = try $ optional (char '.' >> many spacetab) >>
string "\\}" >> (lexLine <|> lexEmptyLine)
-- could be comment
lexIncludeFile :: PandocMonad m => [Arg] -> RoffLexer m RoffTokens
lexIncludeFile args = do
pos <- getPosition
case args of
(f:_) -> do
let fp = linePartsToString f
dirs <- getResourcePath
result <- readFileFromDirs dirs fp
case result of
Nothing -> report $ CouldNotLoadIncludeFile fp pos
Just s -> getInput >>= setInput . (s ++)
return mempty
[] -> return mempty
resolveMacro :: PandocMonad m
=> String -> [Arg] -> SourcePos -> RoffLexer m RoffTokens
resolveMacro macroName args pos = do
macros <- customMacros <$> getState
case M.lookup macroName macros of
Nothing -> return $ singleTok $ ControlLine macroName args pos
Just ts -> do
let fillLP (MacroArg i) zs =
case drop (i - 1) args of
[] -> zs
(ys:_) -> ys ++ zs
fillLP z zs = z : zs
let fillMacroArg (TextLine lineparts) =
TextLine (foldr fillLP [] lineparts)
fillMacroArg x = x
return $ RoffTokens . fmap fillMacroArg . unRoffTokens $ ts
lexStringDef :: PandocMonad m => [Arg] -> RoffLexer m RoffTokens
lexStringDef args = do -- string definition
case args of
[] -> fail "No argument to .ds"
(x:ys) -> do
let ts = singleTok $ TextLine (intercalate [RoffStr " " ] ys)
let stringName = linePartsToString x
modifyState $ \st ->
st{ customMacros = M.insert stringName ts (customMacros st) }
return mempty
lexMacroDef :: PandocMonad m => [Arg] -> RoffLexer m RoffTokens
lexMacroDef args = do -- macro definition
modifyState $ \st -> st{ roffMode = CopyMode }
(macroName, stopMacro) <-
case args of
(x : y : _) -> return (linePartsToString x, linePartsToString y)
-- optional second arg
(x:_) -> return (linePartsToString x, ".")
[] -> fail "No argument to .de"
let stop = try $ do
char '.' <|> char '\''
skipMany spacetab
string stopMacro
_ <- lexArgs
return ()
ts <- mconcat <$> manyTill manToken stop
modifyState $ \st ->
st{ customMacros = M.insert macroName ts (customMacros st)
, roffMode = NormalMode }
return mempty
lexArgs :: PandocMonad m => RoffLexer m [Arg]
lexArgs = do
args <- many $ try oneArg
skipMany spacetab
eofline
return args
where
oneArg :: PandocMonad m => RoffLexer m [LinePart]
oneArg = do
skipMany $ try $ string "\\\n" -- continuation line
try quotedArg <|> plainArg
-- try, because there are some erroneous files, e.g. linux/bpf.2
plainArg :: PandocMonad m => RoffLexer m [LinePart]
plainArg = do
skipMany spacetab
mconcat <$> many1 (macroArg <|> escape <|> regularText <|> unescapedQuote)
where
unescapedQuote = char '"' >> return [RoffStr "\""]
quotedArg :: PandocMonad m => RoffLexer m [LinePart]
quotedArg = do
skipMany spacetab
char '"'
xs <- mconcat <$>
many (macroArg <|> escape <|> regularText
<|> spaceTabChar <|> escapedQuote)
char '"'
return xs
where
escapedQuote = try $ do
char '"'
char '"'
return [RoffStr "\""]
checkDefined :: PandocMonad m => String -> RoffLexer m [LinePart]
checkDefined name = do
macros <- customMacros <$> getState
case M.lookup name macros of
Just _ -> return [RoffStr "1"]
Nothing -> return [RoffStr "0"]
escString :: PandocMonad m => RoffLexer m [LinePart]
escString = try $ do
pos <- getPosition
(do cs <- escapeArg <|> count 1 anyChar
resolveString cs pos)
<|> mempty <$ char 'S'
-- strings and macros share namespace
resolveString :: PandocMonad m
=> String -> SourcePos -> RoffLexer m [LinePart]
resolveString stringname pos = do
RoffTokens ts <- resolveMacro stringname [] pos
case Foldable.toList ts of
[TextLine xs] -> return xs
_ -> do
report $ SkippedContent ("unknown string " ++ stringname) pos
return mempty
lexLine :: PandocMonad m => RoffLexer m RoffTokens
lexLine = do
mode <- roffMode <$> getState
case mode of
CopyMode -> optional $ try $ string "\\&"
NormalMode -> return ()
lnparts <- mconcat <$> many1 linePart
eofline
go lnparts
where -- return empty line if we only have empty strings;
-- this can happen if the line just contains \f[C], for example.
go [] = return mempty
go (RoffStr "" : xs) = go xs
go xs = return $ singleTok $ TextLine xs
linePart :: PandocMonad m => RoffLexer m [LinePart]
linePart = macroArg <|> escape <|>
regularText <|> quoteChar <|> spaceTabChar
backslash :: PandocMonad m => RoffLexer m ()
backslash = do
char '\\'
mode <- roffMode <$> getState
case mode of
-- experimentally, it seems you don't always need to double
-- the backslash in macro defs. It's essential with \\$1,
-- but not with \\f[I]. So we make the second one optional.
CopyMode -> optional $ char '\\'
NormalMode -> return ()
macroArg :: PandocMonad m => RoffLexer m [LinePart]
macroArg = try $ do
pos <- getPosition
backslash
char '$'
x <- escapeArg <|> count 1 digit
case safeRead x of
Just i -> return [MacroArg i]
Nothing -> do
report $ SkippedContent ("illegal macro argument " ++ x) pos
return []
regularText :: PandocMonad m => RoffLexer m [LinePart]
regularText = do
s <- many1 $ noneOf "\n\r\t \\\""
return [RoffStr s]
quoteChar :: PandocMonad m => RoffLexer m [LinePart]
quoteChar = do
char '"'
return [RoffStr "\""]
spaceTabChar :: PandocMonad m => RoffLexer m [LinePart]
spaceTabChar = do
c <- spacetab
return [RoffStr [c]]
lexEmptyLine :: PandocMonad m => RoffLexer m RoffTokens
lexEmptyLine = newline >> return (singleTok EmptyLine)
manToken :: PandocMonad m => RoffLexer m RoffTokens
manToken = lexComment <|> lexMacro <|> lexLine <|> lexEmptyLine
linePartsToString :: [LinePart] -> String
linePartsToString = mconcat . map go
where
go (RoffStr s) = s
go _ = mempty
-- | Tokenize a string as a sequence of roff tokens.
lexRoff :: PandocMonad m => SourcePos -> T.Text -> m RoffTokens
lexRoff pos txt = do
eithertokens <- readWithM (do setPosition pos
mconcat <$> many manToken) def (T.unpack txt)
case eithertokens of
Left e -> throwError e
Right tokenz -> return tokenz
|