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|
{-# LANGUAGE RelaxedPolyRec #-} -- needed for inlinesBetween on GHC < 7
{-# LANGUAGE ScopedTypeVariables #-}
{-
Copyright (C) 2006-2015 John MacFarlane <jgm@berkeley.edu>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
-}
{- |
Module : Text.Pandoc.Readers.Markdown
Copyright : Copyright (C) 2006-2015 John MacFarlane
License : GNU GPL, version 2 or above
Maintainer : John MacFarlane <jgm@berkeley.edu>
Stability : alpha
Portability : portable
Conversion of markdown-formatted plain text to 'Pandoc' document.
-}
module Text.Pandoc.Readers.Markdown ( readMarkdown,
readMarkdownWithWarnings ) where
import Data.List ( transpose, sortBy, findIndex, intersperse, intercalate )
import qualified Data.Map as M
import Data.Scientific (coefficient, base10Exponent)
import Data.Ord ( comparing )
import Data.Char ( isSpace, isAlphaNum, toLower )
import Data.Maybe
import Text.Pandoc.Definition
import Text.Pandoc.Emoji (emojis)
import qualified Data.Text as T
import Data.Text (Text)
import qualified Data.Yaml as Yaml
import Data.Yaml (ParseException(..), YamlException(..), YamlMark(..))
import qualified Data.HashMap.Strict as H
import qualified Text.Pandoc.Builder as B
import qualified Text.Pandoc.UTF8 as UTF8
import qualified Data.Vector as V
import Text.Pandoc.Builder (Inlines, Blocks, trimInlines)
import Text.Pandoc.Options
import Text.Pandoc.Shared
import Text.Pandoc.XML (fromEntities)
import Text.Pandoc.Parsing hiding (tableWith)
import Text.Pandoc.Readers.LaTeX ( rawLaTeXInline, rawLaTeXBlock )
import Text.Pandoc.Readers.HTML ( htmlTag, htmlInBalanced, isInlineTag, isBlockTag,
isTextTag, isCommentTag )
import Control.Monad
import System.FilePath (takeExtension, addExtension)
import Text.HTML.TagSoup
import Text.HTML.TagSoup.Match (tagOpen)
import qualified Data.Set as Set
import Text.Printf (printf)
import Debug.Trace (trace)
import Text.Pandoc.Compat.Monoid ((<>))
import Text.Pandoc.Error
type MarkdownParser = Parser [Char] ParserState
-- | Read markdown from an input string and return a Pandoc document.
readMarkdown :: ReaderOptions -- ^ Reader options
-> String -- ^ String to parse (assuming @'\n'@ line endings)
-> Either PandocError Pandoc
readMarkdown opts s =
(readWith parseMarkdown) def{ stateOptions = opts } (s ++ "\n\n")
-- | Read markdown from an input string and return a pair of a Pandoc document
-- and a list of warnings.
readMarkdownWithWarnings :: ReaderOptions -- ^ Reader options
-> String -- ^ String to parse (assuming @'\n'@ line endings)
-> Either PandocError (Pandoc, [String])
readMarkdownWithWarnings opts s =
(readWithWarnings parseMarkdown) def{ stateOptions = opts } (s ++ "\n\n")
trimInlinesF :: F Inlines -> F Inlines
trimInlinesF = liftM trimInlines
--
-- Constants and data structure definitions
--
isBulletListMarker :: Char -> Bool
isBulletListMarker '*' = True
isBulletListMarker '+' = True
isBulletListMarker '-' = True
isBulletListMarker _ = False
isHruleChar :: Char -> Bool
isHruleChar '*' = True
isHruleChar '-' = True
isHruleChar '_' = True
isHruleChar _ = False
setextHChars :: String
setextHChars = "=-"
isBlank :: Char -> Bool
isBlank ' ' = True
isBlank '\t' = True
isBlank '\n' = True
isBlank _ = False
--
-- auxiliary functions
--
-- | Succeeds when we're in list context.
inList :: MarkdownParser ()
inList = do
ctx <- stateParserContext <$> getState
guard (ctx == ListItemState)
isNull :: F Inlines -> Bool
isNull ils = B.isNull $ runF ils def
spnl :: Parser [Char] st ()
spnl = try $ do
skipSpaces
optional newline
skipSpaces
notFollowedBy (char '\n')
indentSpaces :: MarkdownParser String
indentSpaces = try $ do
tabStop <- getOption readerTabStop
count tabStop (char ' ') <|>
string "\t" <?> "indentation"
nonindentSpaces :: MarkdownParser String
nonindentSpaces = do
tabStop <- getOption readerTabStop
sps <- many (char ' ')
if length sps < tabStop
then return sps
else unexpected "indented line"
-- returns number of spaces parsed
skipNonindentSpaces :: MarkdownParser Int
skipNonindentSpaces = do
tabStop <- getOption readerTabStop
atMostSpaces (tabStop - 1) <* notFollowedBy (char ' ')
atMostSpaces :: Int -> MarkdownParser Int
atMostSpaces n
| n > 0 = (char ' ' >> (+1) <$> atMostSpaces (n-1)) <|> return 0
| otherwise = return 0
litChar :: MarkdownParser Char
litChar = escapedChar'
<|> characterReference
<|> noneOf "\n"
<|> try (newline >> notFollowedBy blankline >> return ' ')
-- | Parse a sequence of inline elements between square brackets,
-- including inlines between balanced pairs of square brackets.
inlinesInBalancedBrackets :: MarkdownParser (F Inlines)
inlinesInBalancedBrackets = do
char '['
(_, raw) <- withRaw $ charsInBalancedBrackets 1
guard $ not $ null raw
parseFromString (trimInlinesF . mconcat <$> many inline) (init raw)
charsInBalancedBrackets :: Int -> MarkdownParser ()
charsInBalancedBrackets 0 = return ()
charsInBalancedBrackets openBrackets =
(char '[' >> charsInBalancedBrackets (openBrackets + 1))
<|> (char ']' >> charsInBalancedBrackets (openBrackets - 1))
<|> (( (() <$ code)
<|> (() <$ (escapedChar'))
<|> (newline >> notFollowedBy blankline)
<|> skipMany1 (noneOf "[]`\n\\")
<|> (() <$ count 1 (oneOf "`\\"))
) >> charsInBalancedBrackets openBrackets)
--
-- document structure
--
titleLine :: MarkdownParser (F Inlines)
titleLine = try $ do
char '%'
skipSpaces
res <- many $ (notFollowedBy newline >> inline)
<|> try (endline >> whitespace)
newline
return $ trimInlinesF $ mconcat res
authorsLine :: MarkdownParser (F [Inlines])
authorsLine = try $ do
char '%'
skipSpaces
authors <- sepEndBy (many (notFollowedBy (satisfy $ \c ->
c == ';' || c == '\n') >> inline))
(char ';' <|>
try (newline >> notFollowedBy blankline >> spaceChar))
newline
return $ sequence $ filter (not . isNull) $ map (trimInlinesF . mconcat) authors
dateLine :: MarkdownParser (F Inlines)
dateLine = try $ do
char '%'
skipSpaces
trimInlinesF . mconcat <$> manyTill inline newline
titleBlock :: MarkdownParser ()
titleBlock = pandocTitleBlock <|> mmdTitleBlock
pandocTitleBlock :: MarkdownParser ()
pandocTitleBlock = try $ do
guardEnabled Ext_pandoc_title_block
lookAhead (char '%')
title <- option mempty titleLine
author <- option (return []) authorsLine
date <- option mempty dateLine
optional blanklines
let meta' = do title' <- title
author' <- author
date' <- date
return $
(if B.isNull title' then id else B.setMeta "title" title')
. (if null author' then id else B.setMeta "author" author')
. (if B.isNull date' then id else B.setMeta "date" date')
$ nullMeta
updateState $ \st -> st{ stateMeta' = stateMeta' st <> meta' }
yamlMetaBlock :: MarkdownParser (F Blocks)
yamlMetaBlock = try $ do
guardEnabled Ext_yaml_metadata_block
pos <- getPosition
string "---"
blankline
notFollowedBy blankline -- if --- is followed by a blank it's an HRULE
rawYamlLines <- manyTill anyLine stopLine
-- by including --- and ..., we allow yaml blocks with just comments:
let rawYaml = unlines ("---" : (rawYamlLines ++ ["..."]))
optional blanklines
opts <- stateOptions <$> getState
meta' <- case Yaml.decodeEither' $ UTF8.fromString rawYaml of
Right (Yaml.Object hashmap) -> return $ return $
H.foldrWithKey (\k v m ->
if ignorable k
then m
else case yamlToMeta opts v of
Left _ -> m
Right v' -> B.setMeta (T.unpack k) v' m)
nullMeta hashmap
Right Yaml.Null -> return $ return nullMeta
Right _ -> do
addWarning (Just pos) "YAML header is not an object"
return $ return nullMeta
Left err' -> do
case err' of
InvalidYaml (Just YamlParseException{
yamlProblem = problem
, yamlContext = _ctxt
, yamlProblemMark = Yaml.YamlMark {
yamlLine = yline
, yamlColumn = ycol
}}) ->
addWarning (Just $ setSourceLine
(setSourceColumn pos
(sourceColumn pos + ycol))
(sourceLine pos + 1 + yline))
$ "Could not parse YAML header: " ++
problem
_ -> addWarning (Just pos)
$ "Could not parse YAML header: " ++
show err'
return $ return nullMeta
updateState $ \st -> st{ stateMeta' = stateMeta' st <> meta' }
return mempty
-- ignore fields ending with _
ignorable :: Text -> Bool
ignorable t = (T.pack "_") `T.isSuffixOf` t
toMetaValue :: ReaderOptions -> Text -> Either PandocError MetaValue
toMetaValue opts x = toMeta <$> readMarkdown opts' (T.unpack x)
where
toMeta p =
case p of
Pandoc _ [Plain xs] -> MetaInlines xs
Pandoc _ [Para xs]
| endsWithNewline x -> MetaBlocks [Para xs]
| otherwise -> MetaInlines xs
Pandoc _ bs -> MetaBlocks bs
endsWithNewline t = T.pack "\n" `T.isSuffixOf` t
opts' = opts{readerExtensions=readerExtensions opts `Set.difference` meta_exts}
meta_exts = Set.fromList [ Ext_pandoc_title_block
, Ext_mmd_title_block
, Ext_yaml_metadata_block
]
yamlToMeta :: ReaderOptions -> Yaml.Value -> Either PandocError MetaValue
yamlToMeta opts (Yaml.String t) = toMetaValue opts t
yamlToMeta _ (Yaml.Number n)
-- avoid decimal points for numbers that don't need them:
| base10Exponent n >= 0 = return $ MetaString $ show
$ coefficient n * (10 ^ base10Exponent n)
| otherwise = return $ MetaString $ show n
yamlToMeta _ (Yaml.Bool b) = return $ MetaBool b
yamlToMeta opts (Yaml.Array xs) = B.toMetaValue <$> mapM (yamlToMeta opts)
(V.toList xs)
yamlToMeta opts (Yaml.Object o) = MetaMap <$> H.foldrWithKey (\k v m ->
if ignorable k
then m
else (do
v' <- yamlToMeta opts v
m' <- m
return (M.insert (T.unpack k) v' m')))
(return M.empty) o
yamlToMeta _ _ = return $ MetaString ""
stopLine :: MarkdownParser ()
stopLine = try $ (string "---" <|> string "...") >> blankline >> return ()
mmdTitleBlock :: MarkdownParser ()
mmdTitleBlock = try $ do
guardEnabled Ext_mmd_title_block
firstPair <- kvPair False
restPairs <- many (kvPair True)
let kvPairs = firstPair : restPairs
blanklines
updateState $ \st -> st{ stateMeta' = stateMeta' st <>
return (Meta $ M.fromList kvPairs) }
kvPair :: Bool -> MarkdownParser (String, MetaValue)
kvPair allowEmpty = try $ do
key <- many1Till (alphaNum <|> oneOf "_- ") (char ':')
val <- trim <$> manyTill anyChar
(try $ newline >> lookAhead (blankline <|> nonspaceChar))
guard $ allowEmpty || not (null val)
let key' = concat $ words $ map toLower key
let val' = MetaBlocks $ B.toList $ B.plain $ B.text $ val
return (key',val')
parseMarkdown :: MarkdownParser Pandoc
parseMarkdown = do
-- markdown allows raw HTML
updateState $ \state -> state { stateOptions =
let oldOpts = stateOptions state in
oldOpts{ readerParseRaw = True } }
optional titleBlock
blocks <- parseBlocks
st <- getState
let meta = runF (stateMeta' st) st
let Pandoc _ bs = B.doc $ runF blocks st
return $ Pandoc meta bs
referenceKey :: MarkdownParser (F Blocks)
referenceKey = try $ do
pos <- getPosition
skipNonindentSpaces
(_,raw) <- reference
char ':'
skipSpaces >> optional newline >> skipSpaces >> notFollowedBy (char '[')
let sourceURL = liftM unwords $ many $ try $ do
skipMany spaceChar
notFollowedBy' referenceTitle
notFollowedBy' $ guardEnabled Ext_link_attributes >> attributes
notFollowedBy' (() <$ reference)
many1 $ notFollowedBy space >> litChar
let betweenAngles = try $ char '<' >> manyTill litChar (char '>')
src <- try betweenAngles <|> sourceURL
tit <- option "" referenceTitle
attr <- option nullAttr $ try $
guardEnabled Ext_link_attributes >> skipSpaces >> attributes
addKvs <- option [] $ guardEnabled Ext_mmd_link_attributes
>> many (try $ spnl >> keyValAttr)
blanklines
let attr' = extractIdClass $ foldl (\x f -> f x) attr addKvs
target = (escapeURI $ trimr src, tit)
st <- getState
let oldkeys = stateKeys st
let key = toKey raw
case M.lookup key oldkeys of
Just _ -> addWarning (Just pos) $ "Duplicate link reference `" ++ raw ++ "'"
Nothing -> return ()
updateState $ \s -> s { stateKeys = M.insert key (target, attr') oldkeys }
return $ return mempty
referenceTitle :: MarkdownParser String
referenceTitle = try $ do
skipSpaces >> optional newline >> skipSpaces
quotedTitle '"' <|> quotedTitle '\'' <|> charsInBalanced '(' ')' litChar
-- A link title in quotes
quotedTitle :: Char -> MarkdownParser String
quotedTitle c = try $ do
char c
notFollowedBy spaces
let pEnder = try $ char c >> notFollowedBy (satisfy isAlphaNum)
let regChunk = many1 (noneOf ['\\','\n','&',c]) <|> count 1 litChar
let nestedChunk = (\x -> [c] ++ x ++ [c]) <$> quotedTitle c
unwords . words . concat <$> manyTill (nestedChunk <|> regChunk) pEnder
-- | PHP Markdown Extra style abbreviation key. Currently
-- we just skip them, since Pandoc doesn't have an element for
-- an abbreviation.
abbrevKey :: MarkdownParser (F Blocks)
abbrevKey = do
guardEnabled Ext_abbreviations
try $ do
char '*'
reference
char ':'
skipMany (satisfy (/= '\n'))
blanklines
return $ return mempty
noteMarker :: MarkdownParser String
noteMarker = string "[^" >> many1Till (satisfy $ not . isBlank) (char ']')
rawLine :: MarkdownParser String
rawLine = try $ do
notFollowedBy blankline
notFollowedBy' $ try $ skipNonindentSpaces >> noteMarker
optional indentSpaces
anyLine
rawLines :: MarkdownParser String
rawLines = do
first <- anyLine
rest <- many rawLine
return $ unlines (first:rest)
noteBlock :: MarkdownParser (F Blocks)
noteBlock = try $ do
pos <- getPosition
skipNonindentSpaces
ref <- noteMarker
char ':'
optional blankline
optional indentSpaces
first <- rawLines
rest <- many $ try $ blanklines >> indentSpaces >> rawLines
let raw = unlines (first:rest) ++ "\n"
optional blanklines
parsed <- parseFromString parseBlocks raw
let newnote = (ref, parsed)
oldnotes <- stateNotes' <$> getState
case lookup ref oldnotes of
Just _ -> addWarning (Just pos) $ "Duplicate note reference `" ++ ref ++ "'"
Nothing -> return ()
updateState $ \s -> s { stateNotes' = newnote : oldnotes }
return mempty
--
-- parsing blocks
--
parseBlocks :: MarkdownParser (F Blocks)
parseBlocks = mconcat <$> manyTill block eof
block :: MarkdownParser (F Blocks)
block = do
tr <- getOption readerTrace
pos <- getPosition
res <- choice [ mempty <$ blanklines
, codeBlockFenced
, yamlMetaBlock
, guardEnabled Ext_latex_macros *> (macro >>= return . return)
-- note: bulletList needs to be before header because of
-- the possibility of empty list items: -
, bulletList
, header
, lhsCodeBlock
, divHtml
, htmlBlock
, table
, codeBlockIndented
, rawTeXBlock
, lineBlock
, blockQuote
, hrule
, orderedList
, definitionList
, noteBlock
, referenceKey
, abbrevKey
, para
, plain
] <?> "block"
when tr $ do
st <- getState
trace (printf "line %d: %s" (sourceLine pos)
(take 60 $ show $ B.toList $ runF res st)) (return ())
return res
--
-- header blocks
--
header :: MarkdownParser (F Blocks)
header = setextHeader <|> atxHeader <?> "header"
atxChar :: MarkdownParser Char
atxChar = do
exts <- getOption readerExtensions
return $ if Set.member Ext_literate_haskell exts
then '=' else '#'
atxHeader :: MarkdownParser (F Blocks)
atxHeader = try $ do
level <- atxChar >>= many1 . char >>= return . length
notFollowedBy $ guardEnabled Ext_fancy_lists >>
(char '.' <|> char ')') -- this would be a list
skipSpaces
(text, raw) <- withRaw $
trimInlinesF . mconcat <$> many (notFollowedBy atxClosing >> inline)
attr <- atxClosing
attr' <- registerHeader attr (runF text defaultParserState)
guardDisabled Ext_implicit_header_references
<|> registerImplicitHeader raw attr'
return $ B.headerWith attr' level <$> text
atxClosing :: MarkdownParser Attr
atxClosing = try $ do
attr' <- option nullAttr
(guardEnabled Ext_mmd_header_identifiers >> mmdHeaderIdentifier)
skipMany . char =<< atxChar
skipSpaces
attr <- option attr'
(guardEnabled Ext_header_attributes >> attributes)
blanklines
return attr
setextHeaderEnd :: MarkdownParser Attr
setextHeaderEnd = try $ do
attr <- option nullAttr
$ (guardEnabled Ext_mmd_header_identifiers >> mmdHeaderIdentifier)
<|> (guardEnabled Ext_header_attributes >> attributes)
blanklines
return attr
mmdHeaderIdentifier :: MarkdownParser Attr
mmdHeaderIdentifier = do
ident <- stripFirstAndLast . snd <$> reference
skipSpaces
return (ident,[],[])
setextHeader :: MarkdownParser (F Blocks)
setextHeader = try $ do
-- This lookahead prevents us from wasting time parsing Inlines
-- unless necessary -- it gives a significant performance boost.
lookAhead $ anyLine >> many1 (oneOf setextHChars) >> blankline
skipSpaces
(text, raw) <- withRaw $
trimInlinesF . mconcat <$> many1 (notFollowedBy setextHeaderEnd >> inline)
attr <- setextHeaderEnd
underlineChar <- oneOf setextHChars
many (char underlineChar)
blanklines
let level = (fromMaybe 0 $ findIndex (== underlineChar) setextHChars) + 1
attr' <- registerHeader attr (runF text defaultParserState)
guardDisabled Ext_implicit_header_references
<|> registerImplicitHeader raw attr'
return $ B.headerWith attr' level <$> text
registerImplicitHeader :: String -> Attr -> MarkdownParser ()
registerImplicitHeader raw attr@(ident, _, _) = do
let key = toKey $ "[" ++ raw ++ "]"
updateState (\s -> s { stateHeaderKeys =
M.insert key (('#':ident,""), attr) (stateHeaderKeys s) })
--
-- hrule block
--
hrule :: Parser [Char] st (F Blocks)
hrule = try $ do
skipSpaces
start <- satisfy isHruleChar
count 2 (skipSpaces >> char start)
skipMany (spaceChar <|> char start)
newline
optional blanklines
return $ return B.horizontalRule
--
-- code blocks
--
indentedLine :: MarkdownParser String
indentedLine = indentSpaces >> anyLine >>= return . (++ "\n")
blockDelimiter :: (Char -> Bool)
-> Maybe Int
-> Parser [Char] st Int
blockDelimiter f len = try $ do
c <- lookAhead (satisfy f)
case len of
Just l -> count l (char c) >> many (char c) >> return l
Nothing -> count 3 (char c) >> many (char c) >>=
return . (+ 3) . length
attributes :: MarkdownParser Attr
attributes = try $ do
char '{'
spnl
attrs <- many (attribute <* spnl)
char '}'
return $ foldl (\x f -> f x) nullAttr attrs
attribute :: MarkdownParser (Attr -> Attr)
attribute = identifierAttr <|> classAttr <|> keyValAttr <|> specialAttr
identifier :: MarkdownParser String
identifier = do
first <- letter
rest <- many $ alphaNum <|> oneOf "-_:."
return (first:rest)
identifierAttr :: MarkdownParser (Attr -> Attr)
identifierAttr = try $ do
char '#'
result <- identifier
return $ \(_,cs,kvs) -> (result,cs,kvs)
classAttr :: MarkdownParser (Attr -> Attr)
classAttr = try $ do
char '.'
result <- identifier
return $ \(id',cs,kvs) -> (id',cs ++ [result],kvs)
keyValAttr :: MarkdownParser (Attr -> Attr)
keyValAttr = try $ do
key <- identifier
char '='
val <- enclosed (char '"') (char '"') litChar
<|> enclosed (char '\'') (char '\'') litChar
<|> many (escapedChar' <|> noneOf " \t\n\r}")
return $ \(id',cs,kvs) ->
case key of
"id" -> (val,cs,kvs)
"class" -> (id',cs ++ words val,kvs)
_ -> (id',cs,kvs ++ [(key,val)])
specialAttr :: MarkdownParser (Attr -> Attr)
specialAttr = do
char '-'
return $ \(id',cs,kvs) -> (id',cs ++ ["unnumbered"],kvs)
codeBlockFenced :: MarkdownParser (F Blocks)
codeBlockFenced = try $ do
c <- try (guardEnabled Ext_fenced_code_blocks >> lookAhead (char '~'))
<|> (guardEnabled Ext_backtick_code_blocks >> lookAhead (char '`'))
size <- blockDelimiter (== c) Nothing
skipMany spaceChar
attr <- option ([],[],[]) $
try (guardEnabled Ext_fenced_code_attributes >> attributes)
<|> ((\x -> ("",[toLanguageId x],[])) <$> many1 nonspaceChar)
blankline
contents <- manyTill anyLine (blockDelimiter (== c) (Just size))
blanklines
return $ return $ B.codeBlockWith attr $ intercalate "\n" contents
-- correctly handle github language identifiers
toLanguageId :: String -> String
toLanguageId = map toLower . go
where go "c++" = "cpp"
go "objective-c" = "objectivec"
go x = x
codeBlockIndented :: MarkdownParser (F Blocks)
codeBlockIndented = do
contents <- many1 (indentedLine <|>
try (do b <- blanklines
l <- indentedLine
return $ b ++ l))
optional blanklines
classes <- getOption readerIndentedCodeClasses
return $ return $ B.codeBlockWith ("", classes, []) $
stripTrailingNewlines $ concat contents
lhsCodeBlock :: MarkdownParser (F Blocks)
lhsCodeBlock = do
guardEnabled Ext_literate_haskell
(return . B.codeBlockWith ("",["sourceCode","literate","haskell"],[]) <$>
(lhsCodeBlockBird <|> lhsCodeBlockLaTeX))
<|> (return . B.codeBlockWith ("",["sourceCode","haskell"],[]) <$>
lhsCodeBlockInverseBird)
lhsCodeBlockLaTeX :: MarkdownParser String
lhsCodeBlockLaTeX = try $ do
string "\\begin{code}"
manyTill spaceChar newline
contents <- many1Till anyChar (try $ string "\\end{code}")
blanklines
return $ stripTrailingNewlines contents
lhsCodeBlockBird :: MarkdownParser String
lhsCodeBlockBird = lhsCodeBlockBirdWith '>'
lhsCodeBlockInverseBird :: MarkdownParser String
lhsCodeBlockInverseBird = lhsCodeBlockBirdWith '<'
lhsCodeBlockBirdWith :: Char -> MarkdownParser String
lhsCodeBlockBirdWith c = try $ do
pos <- getPosition
when (sourceColumn pos /= 1) $ fail "Not in first column"
lns <- many1 $ birdTrackLine c
-- if (as is normal) there is always a space after >, drop it
let lns' = if all (\ln -> null ln || take 1 ln == " ") lns
then map (drop 1) lns
else lns
blanklines
return $ intercalate "\n" lns'
birdTrackLine :: Char -> Parser [Char] st String
birdTrackLine c = try $ do
char c
-- allow html tags on left margin:
when (c == '<') $ notFollowedBy letter
anyLine
--
-- block quotes
--
emailBlockQuoteStart :: MarkdownParser Char
emailBlockQuoteStart = try $ skipNonindentSpaces >> char '>' <* optional (char ' ')
emailBlockQuote :: MarkdownParser [String]
emailBlockQuote = try $ do
emailBlockQuoteStart
let emailLine = many $ nonEndline <|> try
(endline >> notFollowedBy emailBlockQuoteStart >>
return '\n')
let emailSep = try (newline >> emailBlockQuoteStart)
first <- emailLine
rest <- many $ try $ emailSep >> emailLine
let raw = first:rest
newline <|> (eof >> return '\n')
optional blanklines
return raw
blockQuote :: MarkdownParser (F Blocks)
blockQuote = do
raw <- emailBlockQuote
-- parse the extracted block, which may contain various block elements:
contents <- parseFromString parseBlocks $ (intercalate "\n" raw) ++ "\n\n"
return $ B.blockQuote <$> contents
--
-- list blocks
--
bulletListStart :: MarkdownParser ()
bulletListStart = try $ do
optional newline -- if preceded by a Plain block in a list context
startpos <- sourceColumn <$> getPosition
skipNonindentSpaces
notFollowedBy' (() <$ hrule) -- because hrules start out just like lists
satisfy isBulletListMarker
endpos <- sourceColumn <$> getPosition
tabStop <- getOption readerTabStop
lookAhead (newline <|> spaceChar)
() <$ atMostSpaces (tabStop - (endpos - startpos))
anyOrderedListStart :: MarkdownParser (Int, ListNumberStyle, ListNumberDelim)
anyOrderedListStart = try $ do
optional newline -- if preceded by a Plain block in a list context
startpos <- sourceColumn <$> getPosition
skipNonindentSpaces
notFollowedBy $ string "p." >> spaceChar >> digit -- page number
res <- do guardDisabled Ext_fancy_lists
start <- many1 digit >>= safeRead
char '.'
return (start, DefaultStyle, DefaultDelim)
<|> do (num, style, delim) <- anyOrderedListMarker
-- if it could be an abbreviated first name,
-- insist on more than one space
when (delim == Period && (style == UpperAlpha ||
(style == UpperRoman &&
num `elem` [1, 5, 10, 50, 100, 500, 1000]))) $
() <$ spaceChar
return (num, style, delim)
endpos <- sourceColumn <$> getPosition
tabStop <- getOption readerTabStop
lookAhead (newline <|> spaceChar)
atMostSpaces (tabStop - (endpos - startpos))
return res
listStart :: MarkdownParser ()
listStart = bulletListStart <|> (anyOrderedListStart >> return ())
listLine :: MarkdownParser String
listLine = try $ do
notFollowedBy' (do indentSpaces
many spaceChar
listStart)
notFollowedByHtmlCloser
optional (() <$ indentSpaces)
listLineCommon
listLineCommon :: MarkdownParser String
listLineCommon = concat <$> manyTill
( many1 (satisfy $ \c -> c /= '\n' && c /= '<')
<|> liftM snd (htmlTag isCommentTag)
<|> count 1 anyChar
) newline
-- parse raw text for one list item, excluding start marker and continuations
rawListItem :: MarkdownParser a
-> MarkdownParser String
rawListItem start = try $ do
start
first <- listLineCommon
rest <- many (notFollowedBy listStart >> notFollowedBy blankline >> listLine)
blanks <- many blankline
return $ unlines (first:rest) ++ blanks
-- continuation of a list item - indented and separated by blankline
-- or (in compact lists) endline.
-- note: nested lists are parsed as continuations
listContinuation :: MarkdownParser String
listContinuation = try $ do
lookAhead indentSpaces
result <- many1 listContinuationLine
blanks <- many blankline
return $ concat result ++ blanks
notFollowedByHtmlCloser :: MarkdownParser ()
notFollowedByHtmlCloser = do
inHtmlBlock <- stateInHtmlBlock <$> getState
case inHtmlBlock of
Just t -> notFollowedBy' $ htmlTag (~== TagClose t)
Nothing -> return ()
listContinuationLine :: MarkdownParser String
listContinuationLine = try $ do
notFollowedBy blankline
notFollowedBy' listStart
notFollowedByHtmlCloser
optional indentSpaces
result <- anyLine
return $ result ++ "\n"
listItem :: MarkdownParser a
-> MarkdownParser (F Blocks)
listItem start = try $ do
first <- rawListItem start
continuations <- many listContinuation
-- parsing with ListItemState forces markers at beginning of lines to
-- count as list item markers, even if not separated by blank space.
-- see definition of "endline"
state <- getState
let oldContext = stateParserContext state
setState $ state {stateParserContext = ListItemState}
-- parse the extracted block, which may contain various block elements:
let raw = concat (first:continuations)
contents <- parseFromString parseBlocks raw
updateState (\st -> st {stateParserContext = oldContext})
return contents
orderedList :: MarkdownParser (F Blocks)
orderedList = try $ do
(start, style, delim) <- lookAhead anyOrderedListStart
unless (style `elem` [DefaultStyle, Decimal, Example] &&
delim `elem` [DefaultDelim, Period]) $
guardEnabled Ext_fancy_lists
when (style == Example) $ guardEnabled Ext_example_lists
items <- fmap sequence $ many1 $ listItem
( try $ do
optional newline -- if preceded by Plain block in a list
startpos <- sourceColumn <$> getPosition
skipNonindentSpaces
res <- orderedListMarker style delim
endpos <- sourceColumn <$> getPosition
tabStop <- getOption readerTabStop
lookAhead (newline <|> spaceChar)
atMostSpaces (tabStop - (endpos - startpos))
return res )
start' <- option 1 $ guardEnabled Ext_startnum >> return start
return $ B.orderedListWith (start', style, delim) <$> fmap compactify' items
bulletList :: MarkdownParser (F Blocks)
bulletList = do
items <- fmap sequence $ many1 $ listItem bulletListStart
return $ B.bulletList <$> fmap compactify' items
-- definition lists
defListMarker :: MarkdownParser ()
defListMarker = do
sps <- nonindentSpaces
char ':' <|> char '~'
tabStop <- getOption readerTabStop
let remaining = tabStop - (length sps + 1)
if remaining > 0
then try (count remaining (char ' ')) <|> string "\t" <|> many1 spaceChar
else mzero
return ()
definitionListItem :: Bool -> MarkdownParser (F (Inlines, [Blocks]))
definitionListItem compact = try $ do
rawLine' <- anyLine
raw <- many1 $ defRawBlock compact
term <- parseFromString (trimInlinesF . mconcat <$> many inline) rawLine'
contents <- mapM (parseFromString parseBlocks . (++"\n")) raw
optional blanklines
return $ liftM2 (,) term (sequence contents)
defRawBlock :: Bool -> MarkdownParser String
defRawBlock compact = try $ do
hasBlank <- option False $ blankline >> return True
defListMarker
firstline <- anyLine
let dline = try
( do notFollowedBy blankline
notFollowedByHtmlCloser
if compact -- laziness not compatible with compact
then () <$ indentSpaces
else (() <$ indentSpaces)
<|> notFollowedBy defListMarker
anyLine )
rawlines <- many dline
cont <- liftM concat $ many $ try $ do
trailing <- option "" blanklines
ln <- indentSpaces >> notFollowedBy blankline >> anyLine
lns <- many dline
return $ trailing ++ unlines (ln:lns)
return $ trimr (firstline ++ "\n" ++ unlines rawlines ++ cont) ++
if hasBlank || not (null cont) then "\n\n" else ""
definitionList :: MarkdownParser (F Blocks)
definitionList = try $ do
lookAhead (anyLine >>
optional (blankline >> notFollowedBy (table >> return ())) >>
-- don't capture table caption as def list!
defListMarker)
compactDefinitionList <|> normalDefinitionList
compactDefinitionList :: MarkdownParser (F Blocks)
compactDefinitionList = do
guardEnabled Ext_compact_definition_lists
items <- fmap sequence $ many1 $ definitionListItem True
return $ B.definitionList <$> fmap compactify'DL items
normalDefinitionList :: MarkdownParser (F Blocks)
normalDefinitionList = do
guardEnabled Ext_definition_lists
items <- fmap sequence $ many1 $ definitionListItem False
return $ B.definitionList <$> items
--
-- paragraph block
--
para :: MarkdownParser (F Blocks)
para = try $ do
exts <- getOption readerExtensions
result <- trimInlinesF . mconcat <$> many1 inline
option (B.plain <$> result)
$ try $ do
newline
(blanklines >> return mempty)
<|> (guardDisabled Ext_blank_before_blockquote >> () <$ lookAhead blockQuote)
<|> (guardEnabled Ext_backtick_code_blocks >> () <$ lookAhead codeBlockFenced)
<|> (guardDisabled Ext_blank_before_header >> () <$ lookAhead header)
<|> (guardEnabled Ext_lists_without_preceding_blankline >>
-- Avoid creating a paragraph in a nested list.
notFollowedBy' inList >>
() <$ lookAhead listStart)
<|> do guardEnabled Ext_native_divs
inHtmlBlock <- stateInHtmlBlock <$> getState
case inHtmlBlock of
Just "div" -> () <$
lookAhead (htmlTag (~== TagClose "div"))
_ -> mzero
return $ do
result' <- result
case B.toList result' of
[Image attr alt (src,tit)]
| Ext_implicit_figures `Set.member` exts ->
-- the fig: at beginning of title indicates a figure
return $ B.para $ B.singleton
$ Image attr alt (src,'f':'i':'g':':':tit)
_ -> return $ B.para result'
plain :: MarkdownParser (F Blocks)
plain = fmap B.plain . trimInlinesF . mconcat <$> many1 inline
--
-- raw html
--
htmlElement :: MarkdownParser String
htmlElement = rawVerbatimBlock
<|> strictHtmlBlock
<|> liftM snd (htmlTag isBlockTag)
htmlBlock :: MarkdownParser (F Blocks)
htmlBlock = do
guardEnabled Ext_raw_html
try (do
(TagOpen t attrs) <- lookAhead $ fst <$> htmlTag isBlockTag
(guard (t `elem` ["pre","style","script"]) >>
(return . B.rawBlock "html") <$> rawVerbatimBlock)
<|> (do guardEnabled Ext_markdown_attribute
oldMarkdownAttribute <- stateMarkdownAttribute <$> getState
markdownAttribute <-
case lookup "markdown" attrs of
Just "0" -> False <$ updateState (\st -> st{
stateMarkdownAttribute = False })
Just _ -> True <$ updateState (\st -> st{
stateMarkdownAttribute = True })
Nothing -> return oldMarkdownAttribute
res <- if markdownAttribute
then rawHtmlBlocks
else htmlBlock'
updateState $ \st -> st{ stateMarkdownAttribute =
oldMarkdownAttribute }
return res)
<|> (guardEnabled Ext_markdown_in_html_blocks >> rawHtmlBlocks))
<|> htmlBlock'
htmlBlock' :: MarkdownParser (F Blocks)
htmlBlock' = try $ do
first <- htmlElement
skipMany spaceChar
optional blanklines
return $ return $ B.rawBlock "html" first
strictHtmlBlock :: MarkdownParser String
strictHtmlBlock = htmlInBalanced (not . isInlineTag)
rawVerbatimBlock :: MarkdownParser String
rawVerbatimBlock = try $ do
(TagOpen tag _, open) <- htmlTag (tagOpen (flip elem
["pre", "style", "script"])
(const True))
contents <- manyTill anyChar (htmlTag (~== TagClose tag))
return $ open ++ contents ++ renderTags' [TagClose tag]
rawTeXBlock :: MarkdownParser (F Blocks)
rawTeXBlock = do
guardEnabled Ext_raw_tex
result <- (B.rawBlock "latex" . concat <$>
rawLaTeXBlock `sepEndBy1` blankline)
<|> (B.rawBlock "context" . concat <$>
rawConTeXtEnvironment `sepEndBy1` blankline)
spaces
return $ return result
rawHtmlBlocks :: MarkdownParser (F Blocks)
rawHtmlBlocks = do
(TagOpen tagtype _, raw) <- htmlTag isBlockTag
-- try to find closing tag
-- we set stateInHtmlBlock so that closing tags that can be either block or
-- inline will not be parsed as inline tags
oldInHtmlBlock <- stateInHtmlBlock <$> getState
updateState $ \st -> st{ stateInHtmlBlock = Just tagtype }
let closer = htmlTag (\x -> x ~== TagClose tagtype)
contents <- mconcat <$> many (notFollowedBy' closer >> block)
result <-
(closer >>= \(_, rawcloser) -> return (
return (B.rawBlock "html" $ stripMarkdownAttribute raw) <>
contents <>
return (B.rawBlock "html" rawcloser)))
<|> return (return (B.rawBlock "html" raw) <> contents)
updateState $ \st -> st{ stateInHtmlBlock = oldInHtmlBlock }
return result
-- remove markdown="1" attribute
stripMarkdownAttribute :: String -> String
stripMarkdownAttribute s = renderTags' $ map filterAttrib $ parseTags s
where filterAttrib (TagOpen t as) = TagOpen t
[(k,v) | (k,v) <- as, k /= "markdown"]
filterAttrib x = x
--
-- line block
--
lineBlock :: MarkdownParser (F Blocks)
lineBlock = try $ do
guardEnabled Ext_line_blocks
lines' <- lineBlockLines >>=
mapM (parseFromString (trimInlinesF . mconcat <$> many inline))
return $ B.para <$> (mconcat $ intersperse (return B.linebreak) lines')
--
-- Tables
--
-- Parse a dashed line with optional trailing spaces; return its length
-- and the length including trailing space.
dashedLine :: Char
-> Parser [Char] st (Int, Int)
dashedLine ch = do
dashes <- many1 (char ch)
sp <- many spaceChar
let lengthDashes = length dashes
lengthSp = length sp
return (lengthDashes, lengthDashes + lengthSp)
-- Parse a table header with dashed lines of '-' preceded by
-- one (or zero) line of text.
simpleTableHeader :: Bool -- ^ Headerless table
-> MarkdownParser (F [Blocks], [Alignment], [Int])
simpleTableHeader headless = try $ do
rawContent <- if headless
then return ""
else anyLine
initSp <- nonindentSpaces
dashes <- many1 (dashedLine '-')
newline
let (lengths, lines') = unzip dashes
let indices = scanl (+) (length initSp) lines'
-- If no header, calculate alignment on basis of first row of text
rawHeads <- liftM (tail . splitStringByIndices (init indices)) $
if headless
then lookAhead anyLine
else return rawContent
let aligns = zipWith alignType (map (\a -> [a]) rawHeads) lengths
let rawHeads' = if headless
then replicate (length dashes) ""
else rawHeads
heads <- fmap sequence
$ mapM (parseFromString (mconcat <$> many plain))
$ map trim rawHeads'
return (heads, aligns, indices)
-- Returns an alignment type for a table, based on a list of strings
-- (the rows of the column header) and a number (the length of the
-- dashed line under the rows.
alignType :: [String]
-> Int
-> Alignment
alignType [] _ = AlignDefault
alignType strLst len =
let nonempties = filter (not . null) $ map trimr strLst
(leftSpace, rightSpace) =
case sortBy (comparing length) nonempties of
(x:_) -> (head x `elem` " \t", length x < len)
[] -> (False, False)
in case (leftSpace, rightSpace) of
(True, False) -> AlignRight
(False, True) -> AlignLeft
(True, True) -> AlignCenter
(False, False) -> AlignDefault
-- Parse a table footer - dashed lines followed by blank line.
tableFooter :: MarkdownParser String
tableFooter = try $ skipNonindentSpaces >> many1 (dashedLine '-') >> blanklines
-- Parse a table separator - dashed line.
tableSep :: MarkdownParser Char
tableSep = try $ skipNonindentSpaces >> many1 (dashedLine '-') >> char '\n'
-- Parse a raw line and split it into chunks by indices.
rawTableLine :: [Int]
-> MarkdownParser [String]
rawTableLine indices = do
notFollowedBy' (blanklines <|> tableFooter)
line <- many1Till anyChar newline
return $ map trim $ tail $
splitStringByIndices (init indices) line
-- Parse a table line and return a list of lists of blocks (columns).
tableLine :: [Int]
-> MarkdownParser (F [Blocks])
tableLine indices = rawTableLine indices >>=
fmap sequence . mapM (parseFromString (mconcat <$> many plain))
-- Parse a multiline table row and return a list of blocks (columns).
multilineRow :: [Int]
-> MarkdownParser (F [Blocks])
multilineRow indices = do
colLines <- many1 (rawTableLine indices)
let cols = map unlines $ transpose colLines
fmap sequence $ mapM (parseFromString (mconcat <$> many plain)) cols
-- Parses a table caption: inlines beginning with 'Table:'
-- and followed by blank lines.
tableCaption :: MarkdownParser (F Inlines)
tableCaption = try $ do
guardEnabled Ext_table_captions
skipNonindentSpaces
string ":" <|> string "Table:"
trimInlinesF . mconcat <$> many1 inline <* blanklines
-- Parse a simple table with '---' header and one line per row.
simpleTable :: Bool -- ^ Headerless table
-> MarkdownParser ([Alignment], [Double], F [Blocks], F [[Blocks]])
simpleTable headless = do
(aligns, _widths, heads', lines') <-
tableWith (simpleTableHeader headless) tableLine
(return ())
(if headless then tableFooter else tableFooter <|> blanklines)
-- Simple tables get 0s for relative column widths (i.e., use default)
return (aligns, replicate (length aligns) 0, heads', lines')
-- Parse a multiline table: starts with row of '-' on top, then header
-- (which may be multiline), then the rows,
-- which may be multiline, separated by blank lines, and
-- ending with a footer (dashed line followed by blank line).
multilineTable :: Bool -- ^ Headerless table
-> MarkdownParser ([Alignment], [Double], F [Blocks], F [[Blocks]])
multilineTable headless =
tableWith (multilineTableHeader headless) multilineRow blanklines tableFooter
multilineTableHeader :: Bool -- ^ Headerless table
-> MarkdownParser (F [Blocks], [Alignment], [Int])
multilineTableHeader headless = try $ do
unless headless $
tableSep >> notFollowedBy blankline
rawContent <- if headless
then return $ repeat ""
else many1 $ notFollowedBy tableSep >> anyLine
initSp <- nonindentSpaces
dashes <- many1 (dashedLine '-')
newline
let (lengths, lines') = unzip dashes
let indices = scanl (+) (length initSp) lines'
rawHeadsList <- if headless
then liftM (map (:[]) . tail .
splitStringByIndices (init indices)) $ lookAhead anyLine
else return $ transpose $ map
(tail . splitStringByIndices (init indices))
rawContent
let aligns = zipWith alignType rawHeadsList lengths
let rawHeads = if headless
then replicate (length dashes) ""
else map (unlines . map trim) rawHeadsList
heads <- fmap sequence $
mapM (parseFromString (mconcat <$> many plain)) $
map trim rawHeads
return (heads, aligns, indices)
-- Parse a grid table: starts with row of '-' on top, then header
-- (which may be grid), then the rows,
-- which may be grid, separated by blank lines, and
-- ending with a footer (dashed line followed by blank line).
gridTable :: Bool -- ^ Headerless table
-> MarkdownParser ([Alignment], [Double], F [Blocks], F [[Blocks]])
gridTable headless =
tableWith (gridTableHeader headless) gridTableRow
(gridTableSep '-') gridTableFooter
gridTableSplitLine :: [Int] -> String -> [String]
gridTableSplitLine indices line = map removeFinalBar $ tail $
splitStringByIndices (init indices) $ trimr line
gridPart :: Char -> Parser [Char] st (Int, Int)
gridPart ch = do
dashes <- many1 (char ch)
char '+'
let lengthDashes = length dashes
return (lengthDashes, lengthDashes + 1)
gridDashedLines :: Char -> Parser [Char] st [(Int,Int)]
gridDashedLines ch = try $ char '+' >> many1 (gridPart ch) <* blankline
removeFinalBar :: String -> String
removeFinalBar =
reverse . dropWhile (`elem` " \t") . dropWhile (=='|') . reverse
-- | Separator between rows of grid table.
gridTableSep :: Char -> MarkdownParser Char
gridTableSep ch = try $ gridDashedLines ch >> return '\n'
-- | Parse header for a grid table.
gridTableHeader :: Bool -- ^ Headerless table
-> MarkdownParser (F [Blocks], [Alignment], [Int])
gridTableHeader headless = try $ do
optional blanklines
dashes <- gridDashedLines '-'
rawContent <- if headless
then return $ repeat ""
else many1
(notFollowedBy (gridTableSep '=') >> char '|' >>
many1Till anyChar newline)
if headless
then return ()
else gridTableSep '=' >> return ()
let lines' = map snd dashes
let indices = scanl (+) 0 lines'
let aligns = replicate (length lines') AlignDefault
-- RST does not have a notion of alignments
let rawHeads = if headless
then replicate (length dashes) ""
else map (unlines . map trim) $ transpose
$ map (gridTableSplitLine indices) rawContent
heads <- fmap sequence $ mapM (parseFromString parseBlocks . trim) rawHeads
return (heads, aligns, indices)
gridTableRawLine :: [Int] -> MarkdownParser [String]
gridTableRawLine indices = do
char '|'
line <- many1Till anyChar newline
return (gridTableSplitLine indices line)
-- | Parse row of grid table.
gridTableRow :: [Int]
-> MarkdownParser (F [Blocks])
gridTableRow indices = do
colLines <- many1 (gridTableRawLine indices)
let cols = map ((++ "\n") . unlines . removeOneLeadingSpace) $
transpose colLines
fmap compactify' <$> fmap sequence (mapM (parseFromString parseBlocks) cols)
removeOneLeadingSpace :: [String] -> [String]
removeOneLeadingSpace xs =
if all startsWithSpace xs
then map (drop 1) xs
else xs
where startsWithSpace "" = True
startsWithSpace (y:_) = y == ' '
-- | Parse footer for a grid table.
gridTableFooter :: MarkdownParser [Char]
gridTableFooter = blanklines
pipeBreak :: MarkdownParser ([Alignment], [Int])
pipeBreak = try $ do
nonindentSpaces
openPipe <- (True <$ char '|') <|> return False
first <- pipeTableHeaderPart
rest <- many $ sepPipe *> pipeTableHeaderPart
-- surrounding pipes needed for a one-column table:
guard $ not (null rest && not openPipe)
optional (char '|')
blankline
return $ unzip (first:rest)
pipeTable :: MarkdownParser ([Alignment], [Double], F [Blocks], F [[Blocks]])
pipeTable = try $ do
nonindentSpaces
lookAhead nonspaceChar
((heads, rawHead),(aligns, seplengths)) <- (,) <$>
withRaw pipeTableRow <*> pipeBreak
(lines', rawRows) <- unzip <$> many (withRaw pipeTableRow)
let maxlength = maximum $ map length (rawHead : rawRows)
numColumns <- getOption readerColumns
let widths = if maxlength > numColumns
then map (\len ->
fromIntegral (len + 1) / fromIntegral numColumns)
seplengths
else replicate (length aligns) 0.0
return $ (aligns, widths, heads, sequence lines')
sepPipe :: MarkdownParser ()
sepPipe = try $ do
char '|' <|> char '+'
notFollowedBy blankline
-- parse a row, also returning probable alignments for org-table cells
pipeTableRow :: MarkdownParser (F [Blocks])
pipeTableRow = do
skipMany spaceChar
openPipe <- (True <$ char '|') <|> return False
let cell = mconcat <$>
many (notFollowedBy (blankline <|> char '|') >> inline)
first <- cell
rest <- many $ sepPipe *> cell
-- surrounding pipes needed for a one-column table:
guard $ not (null rest && not openPipe)
optional (char '|')
blankline
let cells = sequence (first:rest)
return $ do
cells' <- cells
return $ map
(\ils ->
case trimInlines ils of
ils' | B.isNull ils' -> mempty
| otherwise -> B.plain $ ils') cells'
pipeTableHeaderPart :: Parser [Char] st (Alignment, Int)
pipeTableHeaderPart = try $ do
skipMany spaceChar
left <- optionMaybe (char ':')
pipe <- many1 (char '-')
right <- optionMaybe (char ':')
skipMany spaceChar
let len = length pipe + maybe 0 (const 1) left + maybe 0 (const 1) right
return $
((case (left,right) of
(Nothing,Nothing) -> AlignDefault
(Just _,Nothing) -> AlignLeft
(Nothing,Just _) -> AlignRight
(Just _,Just _) -> AlignCenter), len)
-- Succeed only if current line contains a pipe.
scanForPipe :: Parser [Char] st ()
scanForPipe = do
inp <- getInput
case break (\c -> c == '\n' || c == '|') inp of
(_,'|':_) -> return ()
_ -> mzero
-- | Parse a table using 'headerParser', 'rowParser',
-- 'lineParser', and 'footerParser'. Variant of the version in
-- Text.Pandoc.Parsing.
tableWith :: MarkdownParser (F [Blocks], [Alignment], [Int])
-> ([Int] -> MarkdownParser (F [Blocks]))
-> MarkdownParser sep
-> MarkdownParser end
-> MarkdownParser ([Alignment], [Double], F [Blocks], F [[Blocks]])
tableWith headerParser rowParser lineParser footerParser = try $ do
(heads, aligns, indices) <- headerParser
lines' <- fmap sequence $ rowParser indices `sepEndBy1` lineParser
footerParser
numColumns <- getOption readerColumns
let widths = if (indices == [])
then replicate (length aligns) 0.0
else widthsFromIndices numColumns indices
return $ (aligns, widths, heads, lines')
table :: MarkdownParser (F Blocks)
table = try $ do
frontCaption <- option Nothing (Just <$> tableCaption)
(aligns, widths, heads, lns) <-
try (guardEnabled Ext_pipe_tables >> scanForPipe >> pipeTable) <|>
try (guardEnabled Ext_multiline_tables >>
multilineTable False) <|>
try (guardEnabled Ext_simple_tables >>
(simpleTable True <|> simpleTable False)) <|>
try (guardEnabled Ext_multiline_tables >>
multilineTable True) <|>
try (guardEnabled Ext_grid_tables >>
(gridTable False <|> gridTable True)) <?> "table"
optional blanklines
caption <- case frontCaption of
Nothing -> option (return mempty) tableCaption
Just c -> return c
return $ do
caption' <- caption
heads' <- heads
lns' <- lns
return $ B.table caption' (zip aligns widths) heads' lns'
--
-- inline
--
inline :: MarkdownParser (F Inlines)
inline = choice [ whitespace
, bareURL
, str
, endline
, code
, strongOrEmph
, note
, cite
, link
, image
, math
, strikeout
, subscript
, superscript
, inlineNote -- after superscript because of ^[link](/foo)^
, autoLink
, spanHtml
, rawHtmlInline
, escapedChar
, rawLaTeXInline'
, exampleRef
, smart
, return . B.singleton <$> charRef
, emoji
, symbol
, ltSign
] <?> "inline"
escapedChar' :: MarkdownParser Char
escapedChar' = try $ do
char '\\'
(guardEnabled Ext_all_symbols_escapable >> satisfy (not . isAlphaNum))
<|> oneOf "\\`*_{}[]()>#+-.!~\""
escapedChar :: MarkdownParser (F Inlines)
escapedChar = do
result <- escapedChar'
case result of
' ' -> return $ return $ B.str "\160" -- "\ " is a nonbreaking space
'\n' -> guardEnabled Ext_escaped_line_breaks >>
return (return B.linebreak) -- "\[newline]" is a linebreak
_ -> return $ return $ B.str [result]
ltSign :: MarkdownParser (F Inlines)
ltSign = do
guardDisabled Ext_raw_html
<|> (notFollowedByHtmlCloser >> notFollowedBy' (htmlTag isBlockTag))
char '<'
return $ return $ B.str "<"
exampleRef :: MarkdownParser (F Inlines)
exampleRef = try $ do
guardEnabled Ext_example_lists
char '@'
lab <- many1 (alphaNum <|> oneOf "-_")
return $ do
st <- askF
return $ case M.lookup lab (stateExamples st) of
Just n -> B.str (show n)
Nothing -> B.str ('@':lab)
symbol :: MarkdownParser (F Inlines)
symbol = do
result <- noneOf "<\\\n\t "
<|> try (do lookAhead $ char '\\'
notFollowedBy' (() <$ rawTeXBlock)
char '\\')
return $ return $ B.str [result]
-- parses inline code, between n `s and n `s
code :: MarkdownParser (F Inlines)
code = try $ do
starts <- many1 (char '`')
skipSpaces
result <- many1Till (many1 (noneOf "`\n") <|> many1 (char '`') <|>
(char '\n' >> notFollowedBy' blankline >> return " "))
(try (skipSpaces >> count (length starts) (char '`') >>
notFollowedBy (char '`')))
attr <- option ([],[],[]) (try $ guardEnabled Ext_inline_code_attributes >>
optional whitespace >> attributes)
return $ return $ B.codeWith attr $ trim $ concat result
math :: MarkdownParser (F Inlines)
math = (return . B.displayMath <$> (mathDisplay >>= applyMacros'))
<|> (return . B.math <$> (mathInline >>= applyMacros')) <+?>
((getOption readerSmart >>= guard) *> (return <$> apostrophe)
<* notFollowedBy space)
-- Parses material enclosed in *s, **s, _s, or __s.
-- Designed to avoid backtracking.
enclosure :: Char
-> MarkdownParser (F Inlines)
enclosure c = do
-- we can't start an enclosure with _ if after a string and
-- the intraword_underscores extension is enabled:
guardDisabled Ext_intraword_underscores
<|> guard (c == '*')
<|> (guard =<< notAfterString)
cs <- many1 (char c)
(return (B.str cs) <>) <$> whitespace
<|> do
case length cs of
3 -> three c
2 -> two c mempty
1 -> one c mempty
_ -> return (return $ B.str cs)
ender :: Char -> Int -> MarkdownParser ()
ender c n = try $ do
count n (char c)
guard (c == '*')
<|> guardDisabled Ext_intraword_underscores
<|> notFollowedBy alphaNum
-- Parse inlines til you hit one c or a sequence of two cs.
-- If one c, emit emph and then parse two.
-- If two cs, emit strong and then parse one.
-- Otherwise, emit ccc then the results.
three :: Char -> MarkdownParser (F Inlines)
three c = do
contents <- mconcat <$> many (notFollowedBy (ender c 1) >> inline)
(ender c 3 >> return ((B.strong . B.emph) <$> contents))
<|> (ender c 2 >> one c (B.strong <$> contents))
<|> (ender c 1 >> two c (B.emph <$> contents))
<|> return (return (B.str [c,c,c]) <> contents)
-- Parse inlines til you hit two c's, and emit strong.
-- If you never do hit two cs, emit ** plus inlines parsed.
two :: Char -> F Inlines -> MarkdownParser (F Inlines)
two c prefix' = do
contents <- mconcat <$> many (try $ notFollowedBy (ender c 2) >> inline)
(ender c 2 >> return (B.strong <$> (prefix' <> contents)))
<|> return (return (B.str [c,c]) <> (prefix' <> contents))
-- Parse inlines til you hit a c, and emit emph.
-- If you never hit a c, emit * plus inlines parsed.
one :: Char -> F Inlines -> MarkdownParser (F Inlines)
one c prefix' = do
contents <- mconcat <$> many ( (notFollowedBy (ender c 1) >> inline)
<|> try (string [c,c] >>
notFollowedBy (ender c 1) >>
two c mempty) )
(ender c 1 >> return (B.emph <$> (prefix' <> contents)))
<|> return (return (B.str [c]) <> (prefix' <> contents))
strongOrEmph :: MarkdownParser (F Inlines)
strongOrEmph = enclosure '*' <|> enclosure '_'
-- | Parses a list of inlines between start and end delimiters.
inlinesBetween :: (Show b)
=> MarkdownParser a
-> MarkdownParser b
-> MarkdownParser (F Inlines)
inlinesBetween start end =
(trimInlinesF . mconcat) <$> try (start >> many1Till inner end)
where inner = innerSpace <|> (notFollowedBy' (() <$ whitespace) >> inline)
innerSpace = try $ whitespace <* notFollowedBy' end
strikeout :: MarkdownParser (F Inlines)
strikeout = fmap B.strikeout <$>
(guardEnabled Ext_strikeout >> inlinesBetween strikeStart strikeEnd)
where strikeStart = string "~~" >> lookAhead nonspaceChar
>> notFollowedBy (char '~')
strikeEnd = try $ string "~~"
superscript :: MarkdownParser (F Inlines)
superscript = fmap B.superscript <$> try (do
guardEnabled Ext_superscript
char '^'
mconcat <$> many1Till (notFollowedBy spaceChar >> inline) (char '^'))
subscript :: MarkdownParser (F Inlines)
subscript = fmap B.subscript <$> try (do
guardEnabled Ext_subscript
char '~'
mconcat <$> many1Till (notFollowedBy spaceChar >> inline) (char '~'))
whitespace :: MarkdownParser (F Inlines)
whitespace = spaceChar >> return <$> (lb <|> regsp) <?> "whitespace"
where lb = spaceChar >> skipMany spaceChar >> option B.space (endline >> return B.linebreak)
regsp = skipMany spaceChar >> return B.space
nonEndline :: Parser [Char] st Char
nonEndline = satisfy (/='\n')
str :: MarkdownParser (F Inlines)
str = do
result <- many1 alphaNum
updateLastStrPos
let spacesToNbr = map (\c -> if c == ' ' then '\160' else c)
isSmart <- getOption readerSmart
if isSmart
then case likelyAbbrev result of
[] -> return $ return $ B.str result
xs -> choice (map (\x ->
try (string x >> oneOf " \n" >>
lookAhead alphaNum >>
return (return $ B.str
$ result ++ spacesToNbr x ++ "\160"))) xs)
<|> (return $ return $ B.str result)
else return $ return $ B.str result
-- | if the string matches the beginning of an abbreviation (before
-- the first period, return strings that would finish the abbreviation.
likelyAbbrev :: String -> [String]
likelyAbbrev x =
let abbrevs = [ "Mr.", "Mrs.", "Ms.", "Capt.", "Dr.", "Prof.",
"Gen.", "Gov.", "e.g.", "i.e.", "Sgt.", "St.",
"vol.", "vs.", "Sen.", "Rep.", "Pres.", "Hon.",
"Rev.", "Ph.D.", "M.D.", "M.A.", "p.", "pp.",
"ch.", "sec.", "cf.", "cp."]
abbrPairs = map (break (=='.')) abbrevs
in map snd $ filter (\(y,_) -> y == x) abbrPairs
-- an endline character that can be treated as a space, not a structural break
endline :: MarkdownParser (F Inlines)
endline = try $ do
newline
notFollowedBy blankline
-- parse potential list-starts differently if in a list:
notFollowedBy (inList >> listStart)
guardDisabled Ext_lists_without_preceding_blankline <|> notFollowedBy listStart
guardEnabled Ext_blank_before_blockquote <|> notFollowedBy emailBlockQuoteStart
guardEnabled Ext_blank_before_header <|> (notFollowedBy . char =<< atxChar) -- atx header
guardDisabled Ext_backtick_code_blocks <|>
notFollowedBy (() <$ (lookAhead (char '`') >> codeBlockFenced))
notFollowedByHtmlCloser
(eof >> return mempty)
<|> (guardEnabled Ext_hard_line_breaks >> return (return B.linebreak))
<|> (guardEnabled Ext_ignore_line_breaks >> return mempty)
<|> (return $ return B.space)
--
-- links
--
-- a reference label for a link
reference :: MarkdownParser (F Inlines, String)
reference = do notFollowedBy' (string "[^") -- footnote reference
withRaw $ trimInlinesF <$> inlinesInBalancedBrackets
parenthesizedChars :: MarkdownParser [Char]
parenthesizedChars = do
result <- charsInBalanced '(' ')' litChar
return $ '(' : result ++ ")"
-- source for a link, with optional title
source :: MarkdownParser (String, String)
source = do
char '('
skipSpaces
let urlChunk =
try parenthesizedChars
<|> (notFollowedBy (oneOf " )") >> (count 1 litChar))
<|> try (many1 spaceChar <* notFollowedBy (oneOf "\"')"))
let sourceURL = (unwords . words . concat) <$> many urlChunk
let betweenAngles = try $
char '<' >> manyTill litChar (char '>')
src <- try betweenAngles <|> sourceURL
tit <- option "" $ try $ spnl >> linkTitle
skipSpaces
char ')'
return (escapeURI $ trimr src, tit)
linkTitle :: MarkdownParser String
linkTitle = quotedTitle '"' <|> quotedTitle '\''
link :: MarkdownParser (F Inlines)
link = try $ do
st <- getState
guard $ stateAllowLinks st
setState $ st{ stateAllowLinks = False }
(lab,raw) <- reference
setState $ st{ stateAllowLinks = True }
regLink B.linkWith lab <|> referenceLink B.linkWith (lab,raw)
regLink :: (Attr -> String -> String -> Inlines -> Inlines)
-> F Inlines -> MarkdownParser (F Inlines)
regLink constructor lab = try $ do
(src, tit) <- source
attr <- option nullAttr $
guardEnabled Ext_link_attributes >> attributes
return $ constructor attr src tit <$> lab
-- a link like [this][ref] or [this][] or [this]
referenceLink :: (Attr -> String -> String -> Inlines -> Inlines)
-> (F Inlines, String) -> MarkdownParser (F Inlines)
referenceLink constructor (lab, raw) = do
sp <- (True <$ lookAhead (char ' ')) <|> return False
(_,raw') <- option (mempty, "") $
lookAhead (try (spnl >> normalCite >> return (mempty, "")))
<|>
try (spnl >> reference)
when (raw' == "") $ guardEnabled Ext_shortcut_reference_links
let labIsRef = raw' == "" || raw' == "[]"
let key = toKey $ if labIsRef then raw else raw'
parsedRaw <- parseFromString (mconcat <$> many inline) raw'
fallback <- parseFromString (mconcat <$> many inline) $ dropBrackets raw
implicitHeaderRefs <- option False $
True <$ guardEnabled Ext_implicit_header_references
let makeFallback = do
parsedRaw' <- parsedRaw
fallback' <- fallback
return $ B.str "[" <> fallback' <> B.str "]" <>
(if sp && not (null raw) then B.space else mempty) <>
parsedRaw'
return $ do
keys <- asksF stateKeys
case M.lookup key keys of
Nothing ->
if implicitHeaderRefs
then do
headerKeys <- asksF stateHeaderKeys
case M.lookup key headerKeys of
Just ((src, tit), _) -> constructor nullAttr src tit <$> lab
Nothing -> makeFallback
else makeFallback
Just ((src,tit), attr) -> constructor attr src tit <$> lab
dropBrackets :: String -> String
dropBrackets = reverse . dropRB . reverse . dropLB
where dropRB (']':xs) = xs
dropRB xs = xs
dropLB ('[':xs) = xs
dropLB xs = xs
bareURL :: MarkdownParser (F Inlines)
bareURL = try $ do
guardEnabled Ext_autolink_bare_uris
getState >>= guard . stateAllowLinks
(orig, src) <- uri <|> emailAddress
notFollowedBy $ try $ spaces >> htmlTag (~== TagClose "a")
return $ return $ B.link src "" (B.str orig)
autoLink :: MarkdownParser (F Inlines)
autoLink = try $ do
getState >>= guard . stateAllowLinks
char '<'
(orig, src) <- uri <|> emailAddress
-- in rare cases, something may remain after the uri parser
-- is finished, because the uri parser tries to avoid parsing
-- final punctuation. for example: in `<http://hi---there>`,
-- the URI parser will stop before the dashes.
extra <- fromEntities <$> manyTill nonspaceChar (char '>')
return $ return $ B.link (src ++ escapeURI extra) "" (B.str $ orig ++ extra)
image :: MarkdownParser (F Inlines)
image = try $ do
char '!'
(lab,raw) <- reference
defaultExt <- getOption readerDefaultImageExtension
let constructor attr' src = case takeExtension src of
"" -> B.imageWith attr' (addExtension src defaultExt)
_ -> B.imageWith attr' src
regLink constructor lab <|> referenceLink constructor (lab,raw)
note :: MarkdownParser (F Inlines)
note = try $ do
guardEnabled Ext_footnotes
ref <- noteMarker
return $ do
notes <- asksF stateNotes'
case lookup ref notes of
Nothing -> return $ B.str $ "[^" ++ ref ++ "]"
Just contents -> do
st <- askF
-- process the note in a context that doesn't resolve
-- notes, to avoid infinite looping with notes inside
-- notes:
let contents' = runF contents st{ stateNotes' = [] }
return $ B.note contents'
inlineNote :: MarkdownParser (F Inlines)
inlineNote = try $ do
guardEnabled Ext_inline_notes
char '^'
contents <- inlinesInBalancedBrackets
return $ B.note . B.para <$> contents
rawLaTeXInline' :: MarkdownParser (F Inlines)
rawLaTeXInline' = try $ do
guardEnabled Ext_raw_tex
lookAhead $ char '\\' >> notFollowedBy' (string "start") -- context env
RawInline _ s <- rawLaTeXInline
return $ return $ B.rawInline "tex" s
-- "tex" because it might be context or latex
rawConTeXtEnvironment :: Parser [Char] st String
rawConTeXtEnvironment = try $ do
string "\\start"
completion <- inBrackets (letter <|> digit <|> spaceChar)
<|> (many1 letter)
contents <- manyTill (rawConTeXtEnvironment <|> (count 1 anyChar))
(try $ string "\\stop" >> string completion)
return $ "\\start" ++ completion ++ concat contents ++ "\\stop" ++ completion
inBrackets :: (Parser [Char] st Char) -> Parser [Char] st String
inBrackets parser = do
char '['
contents <- many parser
char ']'
return $ "[" ++ contents ++ "]"
spanHtml :: MarkdownParser (F Inlines)
spanHtml = try $ do
guardEnabled Ext_native_spans
(TagOpen _ attrs, _) <- htmlTag (~== TagOpen "span" [])
contents <- mconcat <$> manyTill inline (htmlTag (~== TagClose "span"))
let ident = fromMaybe "" $ lookup "id" attrs
let classes = maybe [] words $ lookup "class" attrs
let keyvals = [(k,v) | (k,v) <- attrs, k /= "id" && k /= "class"]
case lookup "style" keyvals of
Just s | null ident && null classes &&
map toLower (filter (`notElem` " \t;") s) ==
"font-variant:small-caps"
-> return $ B.smallcaps <$> contents
_ -> return $ B.spanWith (ident, classes, keyvals) <$> contents
divHtml :: MarkdownParser (F Blocks)
divHtml = try $ do
guardEnabled Ext_native_divs
(TagOpen _ attrs, rawtag) <- htmlTag (~== TagOpen "div" [])
-- we set stateInHtmlBlock so that closing tags that can be either block or
-- inline will not be parsed as inline tags
oldInHtmlBlock <- stateInHtmlBlock <$> getState
updateState $ \st -> st{ stateInHtmlBlock = Just "div" }
bls <- option "" (blankline >> option "" blanklines)
contents <- mconcat <$>
many (notFollowedBy' (htmlTag (~== TagClose "div")) >> block)
closed <- option False (True <$ htmlTag (~== TagClose "div"))
if closed
then do
updateState $ \st -> st{ stateInHtmlBlock = oldInHtmlBlock }
let ident = fromMaybe "" $ lookup "id" attrs
let classes = maybe [] words $ lookup "class" attrs
let keyvals = [(k,v) | (k,v) <- attrs, k /= "id" && k /= "class"]
return $ B.divWith (ident, classes, keyvals) <$> contents
else -- avoid backtracing
return $ return (B.rawBlock "html" (rawtag <> bls)) <> contents
rawHtmlInline :: MarkdownParser (F Inlines)
rawHtmlInline = do
guardEnabled Ext_raw_html
inHtmlBlock <- stateInHtmlBlock <$> getState
let isCloseBlockTag t = case inHtmlBlock of
Just t' -> t ~== TagClose t'
Nothing -> False
mdInHtml <- option False $
( guardEnabled Ext_markdown_in_html_blocks
<|> guardEnabled Ext_markdown_attribute
) >> return True
(_,result) <- htmlTag $ if mdInHtml
then (\x -> isInlineTag x &&
not (isCloseBlockTag x))
else not . isTextTag
return $ return $ B.rawInline "html" result
-- Emoji
emojiChars :: [Char]
emojiChars = ['a'..'z'] ++ ['0'..'9'] ++ ['_','+','-']
emoji :: MarkdownParser (F Inlines)
emoji = try $ do
guardEnabled Ext_emoji
char ':'
emojikey <- many1 (oneOf emojiChars)
char ':'
case M.lookup emojikey emojis of
Just s -> return (return (B.str s))
Nothing -> mzero
-- Citations
cite :: MarkdownParser (F Inlines)
cite = do
guardEnabled Ext_citations
citations <- textualCite
<|> do (cs, raw) <- withRaw normalCite
return $ (flip B.cite (B.text raw)) <$> cs
return citations
textualCite :: MarkdownParser (F Inlines)
textualCite = try $ do
(_, key) <- citeKey
let first = Citation{ citationId = key
, citationPrefix = []
, citationSuffix = []
, citationMode = AuthorInText
, citationNoteNum = 0
, citationHash = 0
}
mbrest <- option Nothing $ try $ spnl >> Just <$> withRaw normalCite
case mbrest of
Just (rest, raw) ->
return $ (flip B.cite (B.text $ '@':key ++ " " ++ raw) . (first:))
<$> rest
Nothing ->
(do
(cs, raw) <- withRaw $ bareloc first
let (spaces',raw') = span isSpace raw
spc | null spaces' = mempty
| otherwise = B.space
lab <- parseFromString (mconcat <$> many inline) $ dropBrackets raw'
fallback <- referenceLink B.linkWith (lab,raw')
return $ do
fallback' <- fallback
cs' <- cs
return $
case B.toList fallback' of
Link{}:_ -> B.cite [first] (B.str $ '@':key) <> spc <> fallback'
_ -> B.cite cs' (B.text $ '@':key ++ " " ++ raw))
<|> return (do st <- askF
return $ case M.lookup key (stateExamples st) of
Just n -> B.str (show n)
_ -> B.cite [first] $ B.str $ '@':key)
bareloc :: Citation -> MarkdownParser (F [Citation])
bareloc c = try $ do
spnl
char '['
notFollowedBy $ char '^'
suff <- suffix
rest <- option (return []) $ try $ char ';' >> citeList
spnl
char ']'
notFollowedBy $ oneOf "[("
return $ do
suff' <- suff
rest' <- rest
return $ c{ citationSuffix = B.toList suff' } : rest'
normalCite :: MarkdownParser (F [Citation])
normalCite = try $ do
char '['
spnl
citations <- citeList
spnl
char ']'
return citations
suffix :: MarkdownParser (F Inlines)
suffix = try $ do
hasSpace <- option False (notFollowedBy nonspaceChar >> return True)
spnl
rest <- trimInlinesF . mconcat <$> many (notFollowedBy (oneOf ";]") >> inline)
return $ if hasSpace
then (B.space <>) <$> rest
else rest
prefix :: MarkdownParser (F Inlines)
prefix = trimInlinesF . mconcat <$>
manyTill inline (char ']' <|> liftM (const ']') (lookAhead citeKey))
citeList :: MarkdownParser (F [Citation])
citeList = fmap sequence $ sepBy1 citation (try $ char ';' >> spnl)
citation :: MarkdownParser (F Citation)
citation = try $ do
pref <- prefix
(suppress_author, key) <- citeKey
suff <- suffix
return $ do
x <- pref
y <- suff
return $ Citation{ citationId = key
, citationPrefix = B.toList x
, citationSuffix = B.toList y
, citationMode = if suppress_author
then SuppressAuthor
else NormalCitation
, citationNoteNum = 0
, citationHash = 0
}
smart :: MarkdownParser (F Inlines)
smart = do
getOption readerSmart >>= guard
doubleQuoted <|> singleQuoted <|>
choice (map (return <$>) [apostrophe, dash, ellipses])
singleQuoted :: MarkdownParser (F Inlines)
singleQuoted = try $ do
singleQuoteStart
withQuoteContext InSingleQuote $
fmap B.singleQuoted . trimInlinesF . mconcat <$>
many1Till inline singleQuoteEnd
-- doubleQuoted will handle regular double-quoted sections, as well
-- as dialogues with an open double-quote without a close double-quote
-- in the same paragraph.
doubleQuoted :: MarkdownParser (F Inlines)
doubleQuoted = try $ do
doubleQuoteStart
contents <- mconcat <$> many (try $ notFollowedBy doubleQuoteEnd >> inline)
(withQuoteContext InDoubleQuote $ doubleQuoteEnd >> return
(fmap B.doubleQuoted . trimInlinesF $ contents))
<|> (return $ return (B.str "\8220") <> contents)
|