{-# LANGUAGE RelaxedPolyRec #-} {-# LANGUAGE ScopedTypeVariables #-} {- Copyright (C) 2006-2017 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.Markdown Copyright : Copyright (C) 2006-2017 John MacFarlane License : GNU GPL, version 2 or above Maintainer : John MacFarlane Stability : alpha Portability : portable Conversion of markdown-formatted plain text to 'Pandoc' document. -} module Text.Pandoc.Readers.Markdown ( readMarkdown ) where import Control.Monad import Control.Monad.Except (throwError) import Data.Char (isAlphaNum, isPunctuation, isSpace, toLower) import qualified Data.HashMap.Strict as H import Data.List (findIndex, intercalate, sortBy, transpose) import qualified Data.Map as M import Data.Maybe import Data.Monoid ((<>)) import Data.Ord (comparing) import Data.Scientific (base10Exponent, coefficient) import qualified Data.Set as Set import Data.Text (Text) import qualified Data.Text as T import qualified Data.Vector as V import Data.Yaml (ParseException (..), YamlException (..), YamlMark (..)) import qualified Data.Yaml as Yaml import System.FilePath (addExtension, takeExtension) import Text.HTML.TagSoup import Text.Pandoc.Builder (Blocks, Inlines) import qualified Text.Pandoc.Builder as B import Text.Pandoc.Class (PandocMonad(..), report) import Text.Pandoc.Definition import Text.Pandoc.Emoji (emojis) import Text.Pandoc.Logging import Text.Pandoc.Options import Text.Pandoc.Parsing hiding (tableWith) import Text.Pandoc.Readers.HTML (htmlInBalanced, htmlTag, isBlockTag, isCommentTag, isInlineTag, isTextTag) import Text.Pandoc.Readers.LaTeX (rawLaTeXBlock, rawLaTeXInline) import Text.Pandoc.Shared import qualified Text.Pandoc.UTF8 as UTF8 import Text.Pandoc.XML (fromEntities) type MarkdownParser m = ParserT [Char] ParserState m -- | Read markdown from an input string and return a Pandoc document. readMarkdown :: PandocMonad m => ReaderOptions -- ^ Reader options -> Text -- ^ String to parse (assuming @'\n'@ line endings) -> m Pandoc readMarkdown opts s = do parsed <- (readWithM parseMarkdown) def{ stateOptions = opts } (T.unpack s ++ "\n\n") case parsed of Right result -> return result Left e -> throwError e -- -- 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 :: PandocMonad m => MarkdownParser m () inList = do ctx <- stateParserContext <$> getState guard (ctx == ListItemState) spnl :: PandocMonad m => ParserT [Char] st m () spnl = try $ do skipSpaces optional newline skipSpaces notFollowedBy (char '\n') indentSpaces :: PandocMonad m => MarkdownParser m String indentSpaces = try $ do tabStop <- getOption readerTabStop count tabStop (char ' ') <|> string "\t" "indentation" nonindentSpaces :: PandocMonad m => MarkdownParser m String nonindentSpaces = do n <- skipNonindentSpaces return $ replicate n ' ' -- returns number of spaces parsed skipNonindentSpaces :: PandocMonad m => MarkdownParser m Int skipNonindentSpaces = do tabStop <- getOption readerTabStop atMostSpaces (tabStop - 1) <* notFollowedBy spaceChar atMostSpaces :: PandocMonad m => Int -> MarkdownParser m Int atMostSpaces n | n > 0 = (char ' ' >> (+1) <$> atMostSpaces (n-1)) <|> return 0 | otherwise = return 0 litChar :: PandocMonad m => MarkdownParser m 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 :: PandocMonad m => MarkdownParser m (F Inlines) inlinesInBalancedBrackets = do char '[' pos <- getPosition (_, raw) <- withRaw $ charsInBalancedBrackets 1 guard $ not $ null raw parseFromString' (setPosition pos >> trimInlinesF . mconcat <$> many inline) (init raw) charsInBalancedBrackets :: PandocMonad m => Int -> MarkdownParser m () charsInBalancedBrackets 0 = return () charsInBalancedBrackets openBrackets = (char '[' >> charsInBalancedBrackets (openBrackets + 1)) <|> (char ']' >> charsInBalancedBrackets (openBrackets - 1)) <|> (( (() <$ code) <|> (() <$ (escapedChar')) <|> (newline >> notFollowedBy blankline) <|> skipMany1 (noneOf "[]`\n\\") <|> (() <$ count 1 (oneOf "`\\")) ) >> charsInBalancedBrackets openBrackets) -- -- document structure -- rawTitleBlockLine :: PandocMonad m => MarkdownParser m String rawTitleBlockLine = do char '%' skipSpaces first <- anyLine rest <- many $ try $ do spaceChar notFollowedBy blankline skipSpaces anyLine return $ trim $ unlines (first:rest) titleLine :: PandocMonad m => MarkdownParser m (F Inlines) titleLine = try $ do raw <- rawTitleBlockLine res <- parseFromString' (many inline) raw return $ trimInlinesF $ mconcat res authorsLine :: PandocMonad m => MarkdownParser m (F [Inlines]) authorsLine = try $ do raw <- rawTitleBlockLine let sep = (char ';' <* spaces) <|> newline let pAuthors = sepEndBy (trimInlinesF . mconcat <$> many (try $ notFollowedBy sep >> inline)) sep sequence <$> parseFromString' pAuthors raw dateLine :: PandocMonad m => MarkdownParser m (F Inlines) dateLine = try $ do raw <- rawTitleBlockLine res <- parseFromString' (many inline) raw return $ trimInlinesF $ mconcat res titleBlock :: PandocMonad m => MarkdownParser m () titleBlock = pandocTitleBlock <|> mmdTitleBlock pandocTitleBlock :: PandocMonad m => MarkdownParser m () 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 :: PandocMonad m => MarkdownParser m (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 case Yaml.decodeEither' $ UTF8.fromString rawYaml of Right (Yaml.Object hashmap) -> do let alist = H.toList hashmap mapM_ (\(k, v) -> do if ignorable k then return () else do v' <- yamlToMeta v let k' = T.unpack k updateState $ \st -> st{ stateMeta' = (do m <- stateMeta' st -- if there's already a value, leave it unchanged case lookupMeta k' m of Just _ -> return m Nothing -> do v'' <- v' return $ B.setMeta (T.unpack k) v'' m)} ) alist Right Yaml.Null -> return () Right _ -> do logMessage $ CouldNotParseYamlMetadata "not an object" pos return () Left err' -> do case err' of InvalidYaml (Just YamlParseException{ yamlProblem = problem , yamlContext = _ctxt , yamlProblemMark = Yaml.YamlMark { yamlLine = yline , yamlColumn = ycol }}) -> logMessage $ CouldNotParseYamlMetadata problem (setSourceLine (setSourceColumn pos (sourceColumn pos + ycol)) (sourceLine pos + 1 + yline)) _ -> logMessage $ CouldNotParseYamlMetadata (show err') pos return () return mempty -- ignore fields ending with _ ignorable :: Text -> Bool ignorable t = (T.pack "_") `T.isSuffixOf` t toMetaValue :: PandocMonad m => Text -> MarkdownParser m (F MetaValue) toMetaValue x = toMeta <$> parseFromString' parseBlocks (T.unpack x) where toMeta p = do p' <- p return $ case B.toList p' of [Plain xs] -> MetaInlines xs [Para xs] | endsWithNewline x -> MetaBlocks [Para xs] | otherwise -> MetaInlines xs bs -> MetaBlocks bs endsWithNewline t = T.pack "\n" `T.isSuffixOf` t yamlToMeta :: PandocMonad m => Yaml.Value -> MarkdownParser m (F MetaValue) yamlToMeta (Yaml.String t) = toMetaValue t yamlToMeta (Yaml.Number n) -- avoid decimal points for numbers that don't need them: | base10Exponent n >= 0 = return $ return $ MetaString $ show $ coefficient n * (10 ^ base10Exponent n) | otherwise = return $ return $ MetaString $ show n yamlToMeta (Yaml.Bool b) = return $ return $ MetaBool b yamlToMeta (Yaml.Array xs) = do xs' <- mapM yamlToMeta (V.toList xs) return $ do xs'' <- sequence xs' return $ B.toMetaValue xs'' yamlToMeta (Yaml.Object o) = do let alist = H.toList o foldM (\m (k,v) -> do if ignorable k then return m else do v' <- yamlToMeta v return $ do MetaMap m' <- m v'' <- v' return (MetaMap $ M.insert (T.unpack k) v'' m')) (return $ MetaMap M.empty) alist yamlToMeta _ = return $ return $ MetaString "" stopLine :: PandocMonad m => MarkdownParser m () stopLine = try $ (string "---" <|> string "...") >> blankline >> return () mmdTitleBlock :: PandocMonad m => MarkdownParser m () 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 :: PandocMonad m => Bool -> MarkdownParser m (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 :: PandocMonad m => MarkdownParser m Pandoc parseMarkdown = do optional titleBlock blocks <- parseBlocks st <- getState -- check for notes with no corresponding note references let notesUsed = stateNoteRefs st let notesDefined = M.keys (stateNotes' st) mapM_ (\n -> unless (n `Set.member` notesUsed) $ do -- lookup to get sourcepos case M.lookup n (stateNotes' st) of Just (pos, _) -> report (NoteDefinedButNotUsed n pos) Nothing -> error "The impossible happened.") notesDefined let doc = runF (do Pandoc _ bs <- B.doc <$> blocks meta <- stateMeta' st return $ Pandoc meta bs) st reportLogMessages (do guardEnabled Ext_east_asian_line_breaks return $ eastAsianLineBreakFilter doc) <|> return doc referenceKey :: PandocMonad m => MarkdownParser m (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 $ do guardEnabled Ext_link_attributes skipSpaces >> optional newline >> 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 (t,a) | not (t == target && a == attr') -> -- We don't warn on two duplicate keys if the targets are also -- the same. This can happen naturally with --reference-location=block -- or section. See #3701. logMessage $ DuplicateLinkReference raw pos _ -> return () updateState $ \s -> s { stateKeys = M.insert key (target, attr') oldkeys } return $ return mempty referenceTitle :: PandocMonad m => MarkdownParser m String referenceTitle = try $ do skipSpaces >> optional newline >> skipSpaces quotedTitle '"' <|> quotedTitle '\'' <|> charsInBalanced '(' ')' litChar -- A link title in quotes quotedTitle :: PandocMonad m => Char -> MarkdownParser m 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 :: PandocMonad m => MarkdownParser m (F Blocks) abbrevKey = do guardEnabled Ext_abbreviations try $ do char '*' reference char ':' skipMany (satisfy (/= '\n')) blanklines return $ return mempty noteMarker :: PandocMonad m => MarkdownParser m String noteMarker = string "[^" >> many1Till (satisfy $ not . isBlank) (char ']') rawLine :: PandocMonad m => MarkdownParser m String rawLine = try $ do notFollowedBy blankline notFollowedBy' $ try $ skipNonindentSpaces >> noteMarker optional indentSpaces anyLine rawLines :: PandocMonad m => MarkdownParser m String rawLines = do first <- anyLine rest <- many rawLine return $ unlines (first:rest) noteBlock :: PandocMonad m => MarkdownParser m (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 oldnotes <- stateNotes' <$> getState case M.lookup ref oldnotes of Just _ -> logMessage $ DuplicateNoteReference ref pos Nothing -> return () updateState $ \s -> s { stateNotes' = M.insert ref (pos, parsed) oldnotes } return mempty -- -- parsing blocks -- parseBlocks :: PandocMonad m => MarkdownParser m (F Blocks) parseBlocks = mconcat <$> manyTill block eof block :: PandocMonad m => MarkdownParser m (F Blocks) block = do res <- choice [ mempty <$ blanklines , codeBlockFenced , yamlMetaBlock -- note: bulletList needs to be before header because of -- the possibility of empty list items: - , bulletList , header , lhsCodeBlock , divHtml , htmlBlock , table , codeBlockIndented , latexMacro , rawTeXBlock , lineBlock , blockQuote , hrule , orderedList , definitionList , noteBlock , referenceKey , abbrevKey , para , plain ] "block" trace (take 60 $ show $ B.toList $ runF res defaultParserState) return res -- -- header blocks -- header :: PandocMonad m => MarkdownParser m (F Blocks) header = setextHeader <|> atxHeader "header" atxChar :: PandocMonad m => MarkdownParser m Char atxChar = do exts <- getOption readerExtensions return $ if extensionEnabled Ext_literate_haskell exts then '=' else '#' atxHeader :: PandocMonad m => MarkdownParser m (F Blocks) atxHeader = try $ do level <- atxChar >>= many1 . char >>= return . length notFollowedBy $ guardEnabled Ext_fancy_lists >> (char '.' <|> char ')') -- this would be a list guardDisabled Ext_space_in_atx_header <|> notFollowedBy nonspaceChar 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 :: PandocMonad m => MarkdownParser m 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 :: PandocMonad m => MarkdownParser m Attr setextHeaderEnd = try $ do attr <- option nullAttr $ (guardEnabled Ext_mmd_header_identifiers >> mmdHeaderIdentifier) <|> (guardEnabled Ext_header_attributes >> attributes) blanklines return attr mmdHeaderIdentifier :: PandocMonad m => MarkdownParser m Attr mmdHeaderIdentifier = do (_, raw) <- reference let raw' = trim $ stripFirstAndLast raw let ident = concat $ words $ map toLower raw' let attr = (ident, [], []) guardDisabled Ext_implicit_header_references <|> registerImplicitHeader raw' attr skipSpaces return attr setextHeader :: PandocMonad m => MarkdownParser m (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 :: PandocMonad m => String -> Attr -> MarkdownParser m () registerImplicitHeader raw attr@(ident, _, _) = do let key = toKey $ "[" ++ raw ++ "]" updateState (\s -> s { stateHeaderKeys = M.insert key (('#':ident,""), attr) (stateHeaderKeys s) }) -- -- hrule block -- hrule :: PandocMonad m => ParserT [Char] st m (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 :: PandocMonad m => MarkdownParser m String indentedLine = indentSpaces >> anyLineNewline blockDelimiter :: PandocMonad m => (Char -> Bool) -> Maybe Int -> ParserT [Char] st m 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 :: PandocMonad m => MarkdownParser m Attr attributes = try $ do char '{' spnl attrs <- many (attribute <* spnl) char '}' return $ foldl (\x f -> f x) nullAttr attrs attribute :: PandocMonad m => MarkdownParser m (Attr -> Attr) attribute = identifierAttr <|> classAttr <|> keyValAttr <|> specialAttr identifier :: PandocMonad m => MarkdownParser m String identifier = do first <- letter rest <- many $ alphaNum <|> oneOf "-_:." return (first:rest) identifierAttr :: PandocMonad m => MarkdownParser m (Attr -> Attr) identifierAttr = try $ do char '#' result <- identifier return $ \(_,cs,kvs) -> (result,cs,kvs) classAttr :: PandocMonad m => MarkdownParser m (Attr -> Attr) classAttr = try $ do char '.' result <- identifier return $ \(id',cs,kvs) -> (id',cs ++ [result],kvs) keyValAttr :: PandocMonad m => MarkdownParser m (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 :: PandocMonad m => MarkdownParser m (Attr -> Attr) specialAttr = do char '-' return $ \(id',cs,kvs) -> (id',cs ++ ["unnumbered"],kvs) codeBlockFenced :: PandocMonad m => MarkdownParser m (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 :: PandocMonad m => MarkdownParser m (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 :: PandocMonad m => MarkdownParser m (F Blocks) lhsCodeBlock = do guardEnabled Ext_literate_haskell (return . B.codeBlockWith ("",["sourceCode","literate","haskell"],[]) <$> (lhsCodeBlockBird <|> lhsCodeBlockLaTeX)) <|> (return . B.codeBlockWith ("",["sourceCode","haskell"],[]) <$> lhsCodeBlockInverseBird) lhsCodeBlockLaTeX :: PandocMonad m => MarkdownParser m String lhsCodeBlockLaTeX = try $ do string "\\begin{code}" manyTill spaceChar newline contents <- many1Till anyChar (try $ string "\\end{code}") blanklines return $ stripTrailingNewlines contents lhsCodeBlockBird :: PandocMonad m => MarkdownParser m String lhsCodeBlockBird = lhsCodeBlockBirdWith '>' lhsCodeBlockInverseBird :: PandocMonad m => MarkdownParser m String lhsCodeBlockInverseBird = lhsCodeBlockBirdWith '<' lhsCodeBlockBirdWith :: PandocMonad m => Char -> MarkdownParser m 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 :: PandocMonad m => Char -> ParserT [Char] st m String birdTrackLine c = try $ do char c -- allow html tags on left margin: when (c == '<') $ notFollowedBy letter anyLine -- -- block quotes -- emailBlockQuoteStart :: PandocMonad m => MarkdownParser m Char emailBlockQuoteStart = try $ skipNonindentSpaces >> char '>' <* optional (char ' ') emailBlockQuote :: PandocMonad m => MarkdownParser m [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 :: PandocMonad m => MarkdownParser m (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 :: PandocMonad m => MarkdownParser m () 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 :: PandocMonad m => MarkdownParser m (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 :: PandocMonad m => MarkdownParser m () listStart = bulletListStart <|> (anyOrderedListStart >> return ()) listLine :: PandocMonad m => MarkdownParser m String listLine = try $ do notFollowedBy' (do indentSpaces many spaceChar listStart) notFollowedByHtmlCloser optional (() <$ indentSpaces) listLineCommon listLineCommon :: PandocMonad m => MarkdownParser m 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 :: PandocMonad m => MarkdownParser m a -> MarkdownParser m 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 :: PandocMonad m => MarkdownParser m String listContinuation = try $ do lookAhead indentSpaces result <- many1 listContinuationLine blanks <- many blankline return $ concat result ++ blanks notFollowedByHtmlCloser :: PandocMonad m => MarkdownParser m () notFollowedByHtmlCloser = do inHtmlBlock <- stateInHtmlBlock <$> getState case inHtmlBlock of Just t -> notFollowedBy' $ htmlTag (~== TagClose t) Nothing -> return () listContinuationLine :: PandocMonad m => MarkdownParser m String listContinuationLine = try $ do notFollowedBy blankline notFollowedBy' listStart notFollowedByHtmlCloser optional indentSpaces anyLineNewline listItem :: PandocMonad m => MarkdownParser m a -> MarkdownParser m (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 :: PandocMonad m => MarkdownParser m (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 :: PandocMonad m => MarkdownParser m (F Blocks) bulletList = do items <- fmap sequence $ many1 $ listItem bulletListStart return $ B.bulletList <$> fmap compactify items -- definition lists defListMarker :: PandocMonad m => MarkdownParser m () 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 :: PandocMonad m => Bool -> MarkdownParser m (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 :: PandocMonad m => Bool -> MarkdownParser m String defRawBlock compact = try $ do hasBlank <- option False $ blankline >> return True defListMarker firstline <- anyLineNewline 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 ++ unlines rawlines ++ cont) ++ if hasBlank || not (null cont) then "\n\n" else "" definitionList :: PandocMonad m => MarkdownParser m (F Blocks) definitionList = try $ do lookAhead (anyLine >> optional (blankline >> notFollowedBy (table >> return ())) >> -- don't capture table caption as def list! defListMarker) compactDefinitionList <|> normalDefinitionList compactDefinitionList :: PandocMonad m => MarkdownParser m (F Blocks) compactDefinitionList = do guardEnabled Ext_compact_definition_lists items <- fmap sequence $ many1 $ definitionListItem True return $ B.definitionList <$> fmap compactifyDL items normalDefinitionList :: PandocMonad m => MarkdownParser m (F Blocks) normalDefinitionList = do guardEnabled Ext_definition_lists items <- fmap sequence $ many1 $ definitionListItem False return $ B.definitionList <$> items -- -- paragraph block -- para :: PandocMonad m => MarkdownParser m (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 `extensionEnabled` 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 :: PandocMonad m => MarkdownParser m (F Blocks) plain = fmap B.plain . trimInlinesF . mconcat <$> many1 inline -- -- raw html -- htmlElement :: PandocMonad m => MarkdownParser m String htmlElement = rawVerbatimBlock <|> strictHtmlBlock <|> liftM snd (htmlTag isBlockTag) htmlBlock :: PandocMonad m => MarkdownParser m (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' :: PandocMonad m => MarkdownParser m (F Blocks) htmlBlock' = try $ do first <- htmlElement skipMany spaceChar optional blanklines return $ return $ B.rawBlock "html" first strictHtmlBlock :: PandocMonad m => MarkdownParser m String strictHtmlBlock = htmlInBalanced (not . isInlineTag) rawVerbatimBlock :: PandocMonad m => MarkdownParser m String rawVerbatimBlock = htmlInBalanced isVerbTag where isVerbTag (TagOpen "pre" _) = True isVerbTag (TagOpen "style" _) = True isVerbTag (TagOpen "script" _) = True isVerbTag _ = False latexMacro :: PandocMonad m => MarkdownParser m (F Blocks) latexMacro = try $ do guardEnabled Ext_latex_macros skipNonindentSpaces res <- macro return $ return res rawTeXBlock :: PandocMonad m => MarkdownParser m (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 :: PandocMonad m => MarkdownParser m (F Blocks) rawHtmlBlocks = do (TagOpen tagtype _, raw) <- htmlTag isBlockTag -- we don't want ' text' to be a code block: skipMany spaceChar indentlevel <- (blankline >> length <$> many (char ' ')) <|> return 0 -- try to find closing tag -- we set stateInHtmlBlock so that closing tags that can be either block or -- inline will not be parsed as inline tags oldInHtmlBlock <- stateInHtmlBlock <$> getState updateState $ \st -> st{ stateInHtmlBlock = Just tagtype } let closer = htmlTag (\x -> x ~== TagClose tagtype) let block' = do notFollowedBy' closer atMostSpaces indentlevel block contents <- mconcat <$> many 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 :: PandocMonad m => MarkdownParser m (F Blocks) lineBlock = try $ do guardEnabled Ext_line_blocks lines' <- lineBlockLines >>= mapM (parseFromString' (trimInlinesF . mconcat <$> many inline)) return $ B.lineBlock <$> sequence lines' -- -- Tables -- -- Parse a dashed line with optional trailing spaces; return its length -- and the length including trailing space. dashedLine :: PandocMonad m => Char -> ParserT [Char] st m (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 :: PandocMonad m => Bool -- ^ Headerless table -> MarkdownParser m (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 :: PandocMonad m => MarkdownParser m String tableFooter = try $ skipNonindentSpaces >> many1 (dashedLine '-') >> blanklines -- Parse a table separator - dashed line. tableSep :: PandocMonad m => MarkdownParser m Char tableSep = try $ skipNonindentSpaces >> many1 (dashedLine '-') >> char '\n' -- Parse a raw line and split it into chunks by indices. rawTableLine :: PandocMonad m => [Int] -> MarkdownParser m [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 :: PandocMonad m => [Int] -> MarkdownParser m (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 :: PandocMonad m => [Int] -> MarkdownParser m (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 :: PandocMonad m => MarkdownParser m (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 :: PandocMonad m => Bool -- ^ Headerless table -> MarkdownParser m ([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 :: PandocMonad m => Bool -- ^ Headerless table -> MarkdownParser m ([Alignment], [Double], F [Blocks], F [[Blocks]]) multilineTable headless = tableWith (multilineTableHeader headless) multilineRow blanklines tableFooter multilineTableHeader :: PandocMonad m => Bool -- ^ Headerless table -> MarkdownParser m (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 :: PandocMonad m => Bool -- ^ Headerless table -> MarkdownParser m ([Alignment], [Double], F [Blocks], F [[Blocks]]) gridTable headless = gridTableWith' parseBlocks headless pipeBreak :: PandocMonad m => MarkdownParser m ([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 :: PandocMonad m => MarkdownParser m ([Alignment], [Double], F [Blocks], F [[Blocks]]) pipeTable = try $ do nonindentSpaces lookAhead nonspaceChar (heads,(aligns, seplengths)) <- (,) <$> pipeTableRow <*> pipeBreak let heads' = take (length aligns) <$> heads lines' <- many pipeTableRow let lines'' = map (take (length aligns) <$>) lines' let maxlength = maximum $ map (\x -> length . stringify $ runF x def) (heads' : lines'') 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 :: PandocMonad m => MarkdownParser m () sepPipe = try $ do char '|' <|> char '+' notFollowedBy blankline -- parse a row, also returning probable alignments for org-table cells pipeTableRow :: PandocMonad m => MarkdownParser m (F [Blocks]) pipeTableRow = try $ do scanForPipe skipMany spaceChar openPipe <- (True <$ char '|') <|> return False -- split into cells let chunk = void (code <|> math <|> rawHtmlInline <|> escapedChar <|> rawLaTeXInline') <|> void (noneOf "|\n\r") let cellContents = ((trim . snd) <$> withRaw (many chunk)) >>= parseFromString' pipeTableCell cells <- cellContents `sepEndBy1` (char '|') -- surrounding pipes needed for a one-column table: guard $ not (length cells == 1 && not openPipe) blankline return $ sequence cells pipeTableCell :: PandocMonad m => MarkdownParser m (F Blocks) pipeTableCell = do result <- many inline if null result then return mempty else return $ B.plain . mconcat <$> sequence result pipeTableHeaderPart :: PandocMonad m => ParserT [Char] st m (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 :: PandocMonad m => ParserT [Char] st m () 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 :: PandocMonad m => MarkdownParser m (F [Blocks], [Alignment], [Int]) -> ([Int] -> MarkdownParser m (F [Blocks])) -> MarkdownParser m sep -> MarkdownParser m end -> MarkdownParser m ([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 :: PandocMonad m => MarkdownParser m (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 -- renormalize widths if greater than 100%: let totalWidth = sum widths let widths' = if totalWidth < 1 then widths else map (/ totalWidth) widths return $ do caption' <- caption heads' <- heads lns' <- lns return $ B.table caption' (zip aligns widths') heads' lns' -- -- inline -- inline :: PandocMonad m => MarkdownParser m (F Inlines) inline = choice [ whitespace , bareURL , str , endline , code , strongOrEmph , note , cite , bracketedSpan , link , image , math , strikeout , subscript , superscript , inlineNote -- after superscript because of ^[link](/foo)^ , autoLink , spanHtml , rawHtmlInline , escapedNewline , escapedChar , rawLaTeXInline' , exampleRef , smart , return . B.singleton <$> charRef , emoji , symbol , ltSign ] "inline" escapedChar' :: PandocMonad m => MarkdownParser m Char escapedChar' = try $ do char '\\' (guardEnabled Ext_all_symbols_escapable >> satisfy (not . isAlphaNum)) <|> (guardEnabled Ext_angle_brackets_escapable >> oneOf "\\`*_{}[]()>#+-.!~\"<>") <|> oneOf "\\`*_{}[]()>#+-.!~\"" escapedNewline :: PandocMonad m => MarkdownParser m (F Inlines) escapedNewline = try $ do guardEnabled Ext_escaped_line_breaks char '\\' lookAhead (char '\n') -- don't consume the newline (see #3730) return $ return B.linebreak escapedChar :: PandocMonad m => MarkdownParser m (F Inlines) escapedChar = do result <- escapedChar' case result of ' ' -> return $ return $ B.str "\160" -- "\ " is a nonbreaking space _ -> return $ return $ B.str [result] ltSign :: PandocMonad m => MarkdownParser m (F Inlines) ltSign = do guardDisabled Ext_raw_html <|> (notFollowedByHtmlCloser >> notFollowedBy' (htmlTag isBlockTag)) char '<' return $ return $ B.str "<" exampleRef :: PandocMonad m => MarkdownParser m (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 :: PandocMonad m => MarkdownParser m (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 :: PandocMonad m => MarkdownParser m (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 >> attributes) return $ return $ B.codeWith attr $ trim $ concat result math :: PandocMonad m => MarkdownParser m (F Inlines) math = (return . B.displayMath <$> (mathDisplay >>= applyMacros')) <|> (return . B.math <$> (mathInline >>= applyMacros')) <+?> (guardEnabled Ext_smart *> (return <$> apostrophe) <* notFollowedBy (space <|> satisfy isPunctuation)) -- Parses material enclosed in *s, **s, _s, or __s. -- Designed to avoid backtracking. enclosure :: PandocMonad m => Char -> MarkdownParser m (F Inlines) enclosure c = do -- we can't start an enclosure with _ if after a string and -- the intraword_underscores extension is enabled: guardDisabled Ext_intraword_underscores <|> guard (c == '*') <|> (guard =<< notAfterString) cs <- many1 (char c) (return (B.str cs) <>) <$> whitespace <|> do case length cs of 3 -> three c 2 -> two c mempty 1 -> one c mempty _ -> return (return $ B.str cs) ender :: PandocMonad m => Char -> Int -> MarkdownParser m () 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 :: PandocMonad m => Char -> MarkdownParser m (F Inlines) three c = do contents <- mconcat <$> many (notFollowedBy (ender c 1) >> inline) (ender c 3 >> updateLastStrPos >> return ((B.strong . B.emph) <$> contents)) <|> (ender c 2 >> updateLastStrPos >> one c (B.strong <$> contents)) <|> (ender c 1 >> updateLastStrPos >> two c (B.emph <$> 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 :: PandocMonad m => Char -> F Inlines -> MarkdownParser m (F Inlines) two c prefix' = do contents <- mconcat <$> many (try $ notFollowedBy (ender c 2) >> inline) (ender c 2 >> updateLastStrPos >> return (B.strong <$> (prefix' <> contents))) <|> return (return (B.str [c,c]) <> (prefix' <> contents)) -- Parse inlines til you hit a c, and emit emph. -- If you never hit a c, emit * plus inlines parsed. one :: PandocMonad m => Char -> F Inlines -> MarkdownParser m (F Inlines) one c prefix' = do contents <- mconcat <$> many ( (notFollowedBy (ender c 1) >> inline) <|> try (string [c,c] >> notFollowedBy (ender c 1) >> two c mempty) ) (ender c 1 >> updateLastStrPos >> return (B.emph <$> (prefix' <> contents))) <|> return (return (B.str [c]) <> (prefix' <> contents)) strongOrEmph :: PandocMonad m => MarkdownParser m (F Inlines) strongOrEmph = enclosure '*' <|> enclosure '_' -- | Parses a list of inlines between start and end delimiters. inlinesBetween :: PandocMonad m => (Show b) => MarkdownParser m a -> MarkdownParser m b -> MarkdownParser m (F Inlines) inlinesBetween start end = (trimInlinesF . mconcat) <$> try (start >> many1Till inner end) where inner = innerSpace <|> (notFollowedBy' (() <$ whitespace) >> inline) innerSpace = try $ whitespace <* notFollowedBy' end strikeout :: PandocMonad m => MarkdownParser m (F Inlines) strikeout = fmap B.strikeout <$> (guardEnabled Ext_strikeout >> inlinesBetween strikeStart strikeEnd) where strikeStart = string "~~" >> lookAhead nonspaceChar >> notFollowedBy (char '~') strikeEnd = try $ string "~~" superscript :: PandocMonad m => MarkdownParser m (F Inlines) superscript = fmap B.superscript <$> try (do guardEnabled Ext_superscript char '^' mconcat <$> many1Till (notFollowedBy spaceChar >> inline) (char '^')) subscript :: PandocMonad m => MarkdownParser m (F Inlines) subscript = fmap B.subscript <$> try (do guardEnabled Ext_subscript char '~' mconcat <$> many1Till (notFollowedBy spaceChar >> inline) (char '~')) whitespace :: PandocMonad m => MarkdownParser m (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 :: PandocMonad m => ParserT [Char] st m Char nonEndline = satisfy (/='\n') str :: PandocMonad m => MarkdownParser m (F Inlines) str = do result <- many1 (alphaNum <|> try (char '.' <* notFollowedBy (char '.'))) updateLastStrPos (do guardEnabled Ext_smart abbrevs <- getOption readerAbbreviations if not (null result) && last result == '.' && result `Set.member` abbrevs then try (do ils <- whitespace <|> endline lookAhead alphaNum return $ do ils' <- ils if ils' == B.space then return (B.str result <> B.str "\160") else -- linebreak or softbreak return (ils' <> B.str result <> B.str "\160")) <|> return (return (B.str result)) else return (return (B.str result))) <|> return (return (B.str result)) -- an endline character that can be treated as a space, not a structural break endline :: PandocMonad m => MarkdownParser m (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) <|> (skipMany spaceChar >> return (return B.softbreak)) -- -- links -- -- a reference label for a link reference :: PandocMonad m => MarkdownParser m (F Inlines, String) reference = do notFollowedBy' (string "[^") -- footnote reference withRaw $ trimInlinesF <$> inlinesInBalancedBrackets parenthesizedChars :: PandocMonad m => MarkdownParser m [Char] parenthesizedChars = do result <- charsInBalanced '(' ')' litChar return $ '(' : result ++ ")" -- source for a link, with optional title source :: PandocMonad m => MarkdownParser m (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 :: PandocMonad m => MarkdownParser m String linkTitle = quotedTitle '"' <|> quotedTitle '\'' link :: PandocMonad m => MarkdownParser m (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) bracketedSpan :: PandocMonad m => MarkdownParser m (F Inlines) bracketedSpan = try $ do guardEnabled Ext_bracketed_spans (lab,_) <- reference attr <- attributes return $ if isSmallCaps attr then B.smallcaps <$> lab else B.spanWith attr <$> lab -- | We treat a span as SmallCaps if class is "smallcaps" (and -- no other attributes are set or if style is "font-variant:small-caps" -- (and no other attributes are set). isSmallCaps :: Attr -> Bool isSmallCaps ("",["smallcaps"],[]) = True isSmallCaps ("",[],kvs) = case lookup "style" kvs of Just s -> map toLower (filter (`notElem` " \t;") s) == "font-variant:small-caps" Nothing -> False isSmallCaps _ = False regLink :: PandocMonad m => (Attr -> String -> String -> Inlines -> Inlines) -> F Inlines -> MarkdownParser m (F Inlines) regLink constructor lab = try $ do (src, tit) <- source attr <- option nullAttr $ guardEnabled Ext_link_attributes >> attributes return $ constructor attr src tit <$> lab -- a link like [this][ref] or [this][] or [this] referenceLink :: PandocMonad m => (Attr -> String -> String -> Inlines -> Inlines) -> (F Inlines, String) -> MarkdownParser m (F Inlines) referenceLink constructor (lab, raw) = do sp <- (True <$ lookAhead (char ' ')) <|> return False (_,raw') <- option (mempty, "") $ lookAhead (try (do guardEnabled Ext_citations guardDisabled Ext_spaced_reference_links <|> spnl normalCite return (mempty, ""))) <|> try ((guardDisabled Ext_spaced_reference_links <|> 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 :: PandocMonad m => MarkdownParser m (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 :: PandocMonad m => MarkdownParser m (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 ``, -- the URI parser will stop before the dashes. extra <- fromEntities <$> manyTill nonspaceChar (char '>') attr <- option nullAttr $ try $ guardEnabled Ext_link_attributes >> attributes return $ return $ B.linkWith attr (src ++ escapeURI extra) "" (B.str $ orig ++ extra) image :: PandocMonad m => MarkdownParser m (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 :: PandocMonad m => MarkdownParser m (F Inlines) note = try $ do guardEnabled Ext_footnotes ref <- noteMarker updateState $ \st -> st{ stateNoteRefs = Set.insert ref (stateNoteRefs st) } return $ do notes <- asksF stateNotes' case M.lookup ref notes of Nothing -> return $ B.str $ "[^" ++ ref ++ "]" Just (_pos, 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' = M.empty } return $ B.note contents' inlineNote :: PandocMonad m => MarkdownParser m (F Inlines) inlineNote = try $ do guardEnabled Ext_inline_notes char '^' contents <- inlinesInBalancedBrackets return $ B.note . B.para <$> contents rawLaTeXInline' :: PandocMonad m => MarkdownParser m (F Inlines) rawLaTeXInline' = try $ do guardEnabled Ext_raw_tex lookAhead (char '\\') notFollowedBy' rawConTeXtEnvironment RawInline _ s <- rawLaTeXInline return $ return $ B.rawInline "tex" s -- "tex" because it might be context or latex rawConTeXtEnvironment :: PandocMonad m => ParserT [Char] st m 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 :: PandocMonad m => (ParserT [Char] st m Char) -> ParserT [Char] st m String inBrackets parser = do char '[' contents <- many parser char ']' return $ "[" ++ contents ++ "]" spanHtml :: PandocMonad m => MarkdownParser m (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"] return $ if isSmallCaps (ident, classes, keyvals) then B.smallcaps <$> contents else B.spanWith (ident, classes, keyvals) <$> contents divHtml :: PandocMonad m => MarkdownParser m (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 :: PandocMonad m => MarkdownParser m (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 :: PandocMonad m => MarkdownParser m (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 :: PandocMonad m => MarkdownParser m (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 :: PandocMonad m => MarkdownParser m (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 :: PandocMonad m => Citation -> MarkdownParser m (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 :: PandocMonad m => MarkdownParser m (F [Citation]) normalCite = try $ do char '[' spnl citations <- citeList spnl char ']' return citations suffix :: PandocMonad m => MarkdownParser m (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 <>) <$> rest else rest prefix :: PandocMonad m => MarkdownParser m (F Inlines) prefix = trimInlinesF . mconcat <$> manyTill inline (char ']' <|> liftM (const ']') (lookAhead citeKey)) citeList :: PandocMonad m => MarkdownParser m (F [Citation]) citeList = fmap sequence $ sepBy1 citation (try $ char ';' >> spnl) citation :: PandocMonad m => MarkdownParser m (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 :: PandocMonad m => MarkdownParser m (F Inlines) smart = do guardEnabled Ext_smart doubleQuoted <|> singleQuoted <|> choice (map (return <$>) [apostrophe, dash, ellipses]) singleQuoted :: PandocMonad m => MarkdownParser m (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 :: PandocMonad m => MarkdownParser m (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)