{-# LANGUAGE OverloadedStrings #-} {-# LANGUAGE FlexibleContexts #-} {- Copyright (C) 2006-2015 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.RST Copyright : Copyright (C) 2006-2015 John MacFarlane License : GNU GPL, version 2 or above Maintainer : John MacFarlane Stability : alpha Portability : portable Conversion from reStructuredText to 'Pandoc' document. -} module Text.Pandoc.Readers.RST ( readRST, readRSTWithWarnings ) where import Text.Pandoc.Definition import Text.Pandoc.Builder (setMeta, fromList) import Text.Pandoc.Shared import Text.Pandoc.Parsing import Text.Pandoc.Options import Control.Monad ( when, liftM, guard, mzero ) import Data.List ( findIndex, intercalate, transpose, sort, deleteFirstsBy, isSuffixOf , nub, union) import Data.Maybe (fromMaybe) import qualified Data.Map as M import Text.Printf ( printf ) import Text.Pandoc.Builder (Inlines, Blocks, trimInlines) import qualified Text.Pandoc.Builder as B import Data.Sequence (viewr, ViewR(..)) import Data.Char (toLower, isHexDigit, isSpace) import Data.Monoid ((<>)) import Control.Monad.Except (throwError) import Control.Monad.Trans (lift) import Text.Pandoc.Class (PandocMonad, PandocExecutionError(..)) import qualified Text.Pandoc.Class as P -- | Parse reStructuredText string and return Pandoc document. readRST :: PandocMonad m => ReaderOptions -- ^ Reader options -> String -- ^ String to parse (assuming @'\n'@ line endings) -> m Pandoc readRST opts s = do parsed <- (readWithM parseRST) def{ stateOptions = opts } (s ++ "\n\n") case parsed of Right result -> return result Left _ -> throwError $ PandocParseError "error parsing rst" readRSTWithWarnings :: PandocMonad m => ReaderOptions -- ^ Reader options -> String -- ^ String to parse (assuming @'\n'@ line endings) -> m Pandoc readRSTWithWarnings = readRST type RSTParser m = ParserT [Char] ParserState m -- -- Constants and data structure definitions --- bulletListMarkers :: [Char] bulletListMarkers = "*+-" underlineChars :: [Char] underlineChars = "!\"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~" -- treat these as potentially non-text when parsing inline: specialChars :: [Char] specialChars = "\\`|*_<>$:/[]{}()-.\"'\8216\8217\8220\8221" -- -- parsing documents -- isHeader :: Int -> Block -> Bool isHeader n (Header x _ _) = x == n isHeader _ _ = False -- | Promote all headers in a list of blocks. (Part of -- title transformation for RST.) promoteHeaders :: Int -> [Block] -> [Block] promoteHeaders num ((Header level attr text):rest) = (Header (level - num) attr text):(promoteHeaders num rest) promoteHeaders num (other:rest) = other:(promoteHeaders num rest) promoteHeaders _ [] = [] -- | If list of blocks starts with a header (or a header and subheader) -- of level that are not found elsewhere, return it as a title and -- promote all the other headers. Also process a definition list right -- after the title block as metadata. titleTransform :: ([Block], Meta) -- ^ list of blocks, metadata -> ([Block], Meta) -- ^ modified list of blocks, metadata titleTransform (bs, meta) = let (bs', meta') = case bs of ((Header 1 _ head1):(Header 2 _ head2):rest) | not (any (isHeader 1) rest || any (isHeader 2) rest) -> -- tit/sub (promoteHeaders 2 rest, setMeta "title" (fromList head1) $ setMeta "subtitle" (fromList head2) meta) ((Header 1 _ head1):rest) | not (any (isHeader 1) rest) -> -- title only (promoteHeaders 1 rest, setMeta "title" (fromList head1) meta) _ -> (bs, meta) in case bs' of (DefinitionList ds : rest) -> (rest, metaFromDefList ds meta') _ -> (bs', meta') metaFromDefList :: [([Inline], [[Block]])] -> Meta -> Meta metaFromDefList ds meta = adjustAuthors $ foldr f meta ds where f (k,v) = setMeta (map toLower $ stringify k) (mconcat $ map fromList v) adjustAuthors (Meta metamap) = Meta $ M.adjust splitAuthors "author" $ M.adjust toPlain "date" $ M.adjust toPlain "title" $ M.mapKeys (\k -> if k == "authors" then "author" else k) $ metamap toPlain (MetaBlocks [Para xs]) = MetaInlines xs toPlain x = x splitAuthors (MetaBlocks [Para xs]) = MetaList $ map MetaInlines $ splitAuthors' xs splitAuthors x = x splitAuthors' = map normalizeSpaces . splitOnSemi . concatMap factorSemi splitOnSemi = splitBy (==Str ";") factorSemi (Str []) = [] factorSemi (Str s) = case break (==';') s of (xs,[]) -> [Str xs] (xs,';':ys) -> Str xs : Str ";" : factorSemi (Str ys) (xs,ys) -> Str xs : factorSemi (Str ys) factorSemi x = [x] parseRST :: PandocMonad m => RSTParser m Pandoc parseRST = do optional blanklines -- skip blank lines at beginning of file startPos <- getPosition -- go through once just to get list of reference keys and notes -- docMinusKeys is the raw document with blanks where the keys were... docMinusKeys <- concat <$> manyTill (referenceKey <|> noteBlock <|> lineClump) eof setInput docMinusKeys setPosition startPos st' <- getState let reversedNotes = stateNotes st' updateState $ \s -> s { stateNotes = reverse reversedNotes } -- now parse it for real... blocks <- B.toList <$> parseBlocks standalone <- getOption readerStandalone state <- getState let meta = stateMeta state let (blocks', meta') = if standalone then titleTransform (blocks, meta) else (blocks, meta) return $ Pandoc meta' blocks' -- -- parsing blocks -- parseBlocks :: PandocMonad m => RSTParser m Blocks parseBlocks = mconcat <$> manyTill block eof block :: PandocMonad m => RSTParser m Blocks block = choice [ codeBlock , blockQuote , fieldList , directive , comment , header , hrule , lineBlock -- must go before definitionList , table , list , lhsCodeBlock , para , mempty <$ blanklines ] "block" -- -- field list -- rawFieldListItem :: Monad m => Int -> RSTParser m (String, String) rawFieldListItem minIndent = try $ do indent <- length <$> many (char ' ') guard $ indent >= minIndent char ':' name <- many1Till (noneOf "\n") (char ':') (() <$ lookAhead newline) <|> skipMany1 spaceChar first <- anyLine rest <- option "" $ try $ do lookAhead (count indent (char ' ') >> spaceChar) indentedBlock let raw = (if null first then "" else (first ++ "\n")) ++ rest ++ "\n" return (name, raw) fieldListItem :: PandocMonad m => Int -> RSTParser m (Inlines, [Blocks]) fieldListItem minIndent = try $ do (name, raw) <- rawFieldListItem minIndent term <- parseInlineFromString name contents <- parseFromString parseBlocks raw optional blanklines return (term, [contents]) fieldList :: PandocMonad m => RSTParser m Blocks fieldList = try $ do indent <- length <$> lookAhead (many spaceChar) items <- many1 $ fieldListItem indent case items of [] -> return mempty items' -> return $ B.definitionList items' -- -- line block -- lineBlock :: PandocMonad m => RSTParser m Blocks lineBlock = try $ do lines' <- lineBlockLines lines'' <- mapM parseInlineFromString lines' return $ B.lineBlock lines'' -- -- paragraph block -- -- note: paragraph can end in a :: starting a code block para :: PandocMonad m => RSTParser m Blocks para = try $ do result <- trimInlines . mconcat <$> many1 inline option (B.plain result) $ try $ do newline blanklines case viewr (B.unMany result) of ys :> (Str xs) | "::" `isSuffixOf` xs -> do raw <- option mempty codeBlockBody return $ B.para (B.Many ys <> B.str (take (length xs - 1) xs)) <> raw _ -> return (B.para result) plain :: PandocMonad m => RSTParser m Blocks plain = B.plain . trimInlines . mconcat <$> many1 inline -- -- header blocks -- header :: PandocMonad m => RSTParser m Blocks header = doubleHeader <|> singleHeader "header" -- a header with lines on top and bottom doubleHeader :: PandocMonad m => RSTParser m Blocks doubleHeader = try $ do c <- oneOf underlineChars rest <- many (char c) -- the top line let lenTop = length (c:rest) skipSpaces newline txt <- trimInlines . mconcat <$> many1 (notFollowedBy blankline >> inline) pos <- getPosition let len = (sourceColumn pos) - 1 if (len > lenTop) then fail "title longer than border" else return () blankline -- spaces and newline count lenTop (char c) -- the bottom line blanklines -- check to see if we've had this kind of header before. -- if so, get appropriate level. if not, add to list. state <- getState let headerTable = stateHeaderTable state let (headerTable',level) = case findIndex (== DoubleHeader c) headerTable of Just ind -> (headerTable, ind + 1) Nothing -> (headerTable ++ [DoubleHeader c], (length headerTable) + 1) setState (state { stateHeaderTable = headerTable' }) attr <- registerHeader nullAttr txt return $ B.headerWith attr level txt -- a header with line on the bottom only singleHeader :: PandocMonad m => RSTParser m Blocks singleHeader = try $ do notFollowedBy' whitespace txt <- trimInlines . mconcat <$> many1 (do {notFollowedBy blankline; inline}) pos <- getPosition let len = (sourceColumn pos) - 1 blankline c <- oneOf underlineChars count (len - 1) (char c) many (char c) blanklines state <- getState let headerTable = stateHeaderTable state let (headerTable',level) = case findIndex (== SingleHeader c) headerTable of Just ind -> (headerTable, ind + 1) Nothing -> (headerTable ++ [SingleHeader c], (length headerTable) + 1) setState (state { stateHeaderTable = headerTable' }) attr <- registerHeader nullAttr txt return $ B.headerWith attr level txt -- -- hrule block -- hrule :: Monad m => ParserT [Char] st m Blocks hrule = try $ do chr <- oneOf underlineChars count 3 (char chr) skipMany (char chr) blankline blanklines return B.horizontalRule -- -- code blocks -- -- read a line indented by a given string indentedLine :: Monad m => String -> ParserT [Char] st m [Char] indentedLine indents = try $ do string indents anyLine -- one or more indented lines, possibly separated by blank lines. -- any amount of indentation will work. indentedBlock :: Monad m => ParserT [Char] st m [Char] indentedBlock = try $ do indents <- lookAhead $ many1 spaceChar lns <- many1 $ try $ do b <- option "" blanklines l <- indentedLine indents return (b ++ l) optional blanklines return $ unlines lns quotedBlock :: Monad m => ParserT [Char] st m [Char] quotedBlock = try $ do quote <- lookAhead $ oneOf "!\"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~" lns <- many1 $ lookAhead (char quote) >> anyLine optional blanklines return $ unlines lns codeBlockStart :: Monad m => ParserT [Char] st m Char codeBlockStart = string "::" >> blankline >> blankline codeBlock :: Monad m => ParserT [Char] st m Blocks codeBlock = try $ codeBlockStart >> codeBlockBody codeBlockBody :: Monad m => ParserT [Char] st m Blocks codeBlockBody = try $ B.codeBlock . stripTrailingNewlines <$> (indentedBlock <|> quotedBlock) lhsCodeBlock :: Monad m => RSTParser m Blocks lhsCodeBlock = try $ do getPosition >>= guard . (==1) . sourceColumn guardEnabled Ext_literate_haskell optional codeBlockStart lns <- latexCodeBlock <|> birdCodeBlock blanklines return $ B.codeBlockWith ("", ["sourceCode", "literate", "haskell"], []) $ intercalate "\n" lns latexCodeBlock :: Monad m => ParserT [Char] st m [[Char]] latexCodeBlock = try $ do try (latexBlockLine "\\begin{code}") many1Till anyLine (try $ latexBlockLine "\\end{code}") where latexBlockLine s = skipMany spaceChar >> string s >> blankline birdCodeBlock :: Monad m => ParserT [Char] st m [[Char]] birdCodeBlock = filterSpace <$> many1 birdTrackLine where filterSpace lns = -- if (as is normal) there is always a space after >, drop it if all (\ln -> null ln || take 1 ln == " ") lns then map (drop 1) lns else lns birdTrackLine :: Monad m => ParserT [Char] st m [Char] birdTrackLine = char '>' >> anyLine -- -- block quotes -- blockQuote :: PandocMonad m => RSTParser m Blocks blockQuote = do raw <- indentedBlock -- parse the extracted block, which may contain various block elements: contents <- parseFromString parseBlocks $ raw ++ "\n\n" return $ B.blockQuote contents -- -- list blocks -- list :: PandocMonad m => RSTParser m Blocks list = choice [ bulletList, orderedList, definitionList ] "list" definitionListItem :: PandocMonad m => RSTParser m (Inlines, [Blocks]) definitionListItem = try $ do -- avoid capturing a directive or comment notFollowedBy (try $ char '.' >> char '.') term <- trimInlines . mconcat <$> many1Till inline endline raw <- indentedBlock -- parse the extracted block, which may contain various block elements: contents <- parseFromString parseBlocks $ raw ++ "\n" return (term, [contents]) definitionList :: PandocMonad m => RSTParser m Blocks definitionList = B.definitionList <$> many1 definitionListItem -- parses bullet list start and returns its length (inc. following whitespace) bulletListStart :: Monad m => ParserT [Char] st m Int bulletListStart = try $ do notFollowedBy' hrule -- because hrules start out just like lists marker <- oneOf bulletListMarkers white <- many1 spaceChar return $ length (marker:white) -- parses ordered list start and returns its length (inc following whitespace) orderedListStart :: Monad m => ListNumberStyle -> ListNumberDelim -> RSTParser m Int orderedListStart style delim = try $ do (_, markerLen) <- withHorizDisplacement (orderedListMarker style delim) white <- many1 spaceChar return $ markerLen + length white -- parse a line of a list item listLine :: Monad m => Int -> RSTParser m [Char] listLine markerLength = try $ do notFollowedBy blankline indentWith markerLength line <- anyLine return $ line ++ "\n" -- indent by specified number of spaces (or equiv. tabs) indentWith :: Monad m => Int -> RSTParser m [Char] indentWith num = do tabStop <- getOption readerTabStop if (num < tabStop) then count num (char ' ') else choice [ try (count num (char ' ')), (try (char '\t' >> count (num - tabStop) (char ' '))) ] -- parse raw text for one list item, excluding start marker and continuations rawListItem :: Monad m => RSTParser m Int -> RSTParser m (Int, [Char]) rawListItem start = try $ do markerLength <- start firstLine <- anyLine restLines <- many (listLine markerLength) return (markerLength, (firstLine ++ "\n" ++ (concat restLines))) -- continuation of a list item - indented and separated by blankline or -- (in compact lists) endline. -- Note: nested lists are parsed as continuations. listContinuation :: Monad m => Int -> RSTParser m [Char] listContinuation markerLength = try $ do blanks <- many1 blankline result <- many1 (listLine markerLength) return $ blanks ++ concat result listItem :: PandocMonad m => RSTParser m Int -> RSTParser m Blocks listItem start = try $ do (markerLength, first) <- rawListItem start rest <- many (listContinuation markerLength) blanks <- choice [ try (many blankline <* lookAhead start), many1 blankline ] -- whole list must end with blank. -- 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 itself contain block elements parsed <- parseFromString parseBlocks $ concat (first:rest) ++ blanks updateState (\st -> st {stateParserContext = oldContext}) return $ case B.toList parsed of [Para xs] -> B.singleton $ Plain xs [Para xs, BulletList ys] -> B.fromList [Plain xs, BulletList ys] [Para xs, OrderedList s ys] -> B.fromList [Plain xs, OrderedList s ys] [Para xs, DefinitionList ys] -> B.fromList [Plain xs, DefinitionList ys] _ -> parsed orderedList :: PandocMonad m => RSTParser m Blocks orderedList = try $ do (start, style, delim) <- lookAhead (anyOrderedListMarker <* spaceChar) items <- many1 (listItem (orderedListStart style delim)) let items' = compactify' items return $ B.orderedListWith (start, style, delim) items' bulletList :: PandocMonad m => RSTParser m Blocks bulletList = B.bulletList . compactify' <$> many1 (listItem bulletListStart) -- -- directive (e.g. comment, container, compound-paragraph) -- comment :: Monad m => RSTParser m Blocks comment = try $ do string ".." skipMany1 spaceChar <|> (() <$ lookAhead newline) notFollowedBy' directiveLabel manyTill anyChar blanklines optional indentedBlock return mempty directiveLabel :: Monad m => RSTParser m String directiveLabel = map toLower <$> many1Till (letter <|> char '-') (try $ string "::") directive :: PandocMonad m => RSTParser m Blocks directive = try $ do string ".." directive' -- TODO: line-block, parsed-literal, table, csv-table, list-table -- date -- include -- title directive' :: PandocMonad m => RSTParser m Blocks directive' = do skipMany1 spaceChar label <- directiveLabel skipMany spaceChar top <- many $ satisfy (/='\n') <|> try (char '\n' <* notFollowedBy' (rawFieldListItem 3) <* count 3 (char ' ') <* notFollowedBy blankline) newline fields <- many $ rawFieldListItem 3 body <- option "" $ try $ blanklines >> indentedBlock optional blanklines let body' = body ++ "\n\n" imgAttr cl = ("", classes, getAtt "width" ++ getAtt "height") where classes = words $ maybe "" trim $ lookup cl fields getAtt k = case lookup k fields of Just v -> [(k, filter (not . isSpace) v)] Nothing -> [] case label of "raw" -> return $ B.rawBlock (trim top) (stripTrailingNewlines body) "role" -> addNewRole top $ map (\(k,v) -> (k, trim v)) fields "container" -> parseFromString parseBlocks body' "replace" -> B.para <$> -- consumed by substKey parseInlineFromString (trim top) "unicode" -> B.para <$> -- consumed by substKey parseInlineFromString (trim $ unicodeTransform top) "compound" -> parseFromString parseBlocks body' "pull-quote" -> B.blockQuote <$> parseFromString parseBlocks body' "epigraph" -> B.blockQuote <$> parseFromString parseBlocks body' "highlights" -> B.blockQuote <$> parseFromString parseBlocks body' "rubric" -> B.para . B.strong <$> parseInlineFromString top _ | label `elem` ["attention","caution","danger","error","hint", "important","note","tip","warning"] -> do bod <- parseFromString parseBlocks $ top ++ "\n\n" ++ body' return $ B.divWith ("",["admonition", label],[]) bod "admonition" -> do bod <- parseFromString parseBlocks $ top ++ "\n\n" ++ body' return $ B.divWith ("",["admonition"],[]) bod "sidebar" -> do let subtit = maybe "" trim $ lookup "subtitle" fields tit <- B.para . B.strong <$> parseInlineFromString (trim top ++ if null subtit then "" else (": " ++ subtit)) bod <- parseFromString parseBlocks body' return $ B.divWith ("",["sidebar"],[]) $ tit <> bod "topic" -> do tit <- B.para . B.strong <$> parseInlineFromString top bod <- parseFromString parseBlocks body' return $ B.divWith ("",["topic"],[]) $ tit <> bod "default-role" -> mempty <$ updateState (\s -> s { stateRstDefaultRole = case trim top of "" -> stateRstDefaultRole def role -> role }) x | x == "code" || x == "code-block" -> codeblock (words $ fromMaybe [] $ lookup "class" fields) (lookup "number-lines" fields) (trim top) body "aafig" -> do let attribs = ("", ["aafig"], map (\(k,v) -> (k, trimr v)) fields) return $ B.codeBlockWith attribs $ stripTrailingNewlines body "math" -> return $ B.para $ mconcat $ map B.displayMath $ toChunks $ top ++ "\n\n" ++ body "figure" -> do (caption, legend) <- parseFromString extractCaption body' let src = escapeURI $ trim top return $ B.para (B.imageWith (imgAttr "figclass") src "fig:" caption) <> legend "image" -> do let src = escapeURI $ trim top let alt = B.str $ maybe "image" trim $ lookup "alt" fields let attr = imgAttr "class" return $ B.para $ case lookup "target" fields of Just t -> B.link (escapeURI $ trim t) "" $ B.imageWith attr src "" alt Nothing -> B.imageWith attr src "" alt "class" -> do let attrs = ("", (splitBy isSpace $ trim top), map (\(k,v) -> (k, trimr v)) fields) -- directive content or the first immediately following element children <- case body of "" -> block _ -> parseFromString parseBlocks body' return $ B.divWith attrs children other -> do pos <- getPosition P.addWarningWithPos (Just pos) $ "ignoring unknown directive: " ++ other return mempty -- TODO: -- - Only supports :format: fields with a single format for :raw: roles, -- change Text.Pandoc.Definition.Format to fix addNewRole :: PandocMonad m => String -> [(String, String)] -> RSTParser m Blocks addNewRole roleString fields = do (role, parentRole) <- parseFromString inheritedRole roleString customRoles <- stateRstCustomRoles <$> getState let getBaseRole (r, f, a) roles = case M.lookup r roles of Just (r', f', a') -> getBaseRole (r', f', a') roles Nothing -> (r, f, a) (baseRole, baseFmt, baseAttr) = getBaseRole (parentRole, Nothing, nullAttr) customRoles fmt = if parentRole == "raw" then lookup "format" fields else baseFmt annotate :: [String] -> [String] annotate = maybe id (:) $ if baseRole == "code" then lookup "language" fields else Nothing attr = let (ident, classes, keyValues) = baseAttr -- nub in case role name & language class are the same in (ident, nub . (role :) . annotate $ classes, keyValues) -- warn about syntax we ignore flip mapM_ fields $ \(key, _) -> case key of "language" -> when (baseRole /= "code") $ lift $ P.warn $ "ignoring :language: field because the parent of role :" ++ role ++ ": is :" ++ baseRole ++ ": not :code:" "format" -> when (baseRole /= "raw") $ lift $ P.warn $ "ignoring :format: field because the parent of role :" ++ role ++ ": is :" ++ baseRole ++ ": not :raw:" _ -> lift $ P.warn $ "ignoring unknown field :" ++ key ++ ": in definition of role :" ++ role ++ ": in" when (parentRole == "raw" && countKeys "format" > 1) $ lift $ P.warn $ "ignoring :format: fields after the first in the definition of role :" ++ role ++": in" when (parentRole == "code" && countKeys "language" > 1) $ lift $ P.warn $ "ignoring :language: fields after the first in the definition of role :" ++ role ++": in" updateState $ \s -> s { stateRstCustomRoles = M.insert role (baseRole, fmt, attr) customRoles } return $ B.singleton Null where countKeys k = length . filter (== k) . map fst $ fields inheritedRole = (,) <$> roleName <*> ((char '(' *> roleName <* char ')') <|> pure "span") -- Can contain character codes as decimal numbers or -- hexadecimal numbers, prefixed by 0x, x, \x, U+, u, or \u -- or as XML-style hexadecimal character entities, e.g. ᨫ -- or text, which is used as-is. Comments start with .. unicodeTransform :: String -> String unicodeTransform t = case t of ('.':'.':xs) -> unicodeTransform $ dropWhile (/='\n') xs -- comment ('0':'x':xs) -> go "0x" xs ('x':xs) -> go "x" xs ('\\':'x':xs) -> go "\\x" xs ('U':'+':xs) -> go "U+" xs ('u':xs) -> go "u" xs ('\\':'u':xs) -> go "\\u" xs ('&':'#':'x':xs) -> maybe ("&#x" ++ unicodeTransform xs) -- drop semicolon (\(c,s) -> c : unicodeTransform (drop 1 s)) $ extractUnicodeChar xs (x:xs) -> x : unicodeTransform xs [] -> [] where go pref zs = maybe (pref ++ unicodeTransform zs) (\(c,s) -> c : unicodeTransform s) $ extractUnicodeChar zs extractUnicodeChar :: String -> Maybe (Char, String) extractUnicodeChar s = maybe Nothing (\c -> Just (c,rest)) mbc where (ds,rest) = span isHexDigit s mbc = safeRead ('\'':'\\':'x':ds ++ "'") extractCaption :: PandocMonad m => RSTParser m (Inlines, Blocks) extractCaption = do capt <- trimInlines . mconcat <$> many inline legend <- optional blanklines >> (mconcat <$> many block) return (capt,legend) -- divide string by blanklines toChunks :: String -> [String] toChunks = dropWhile null . map (trim . unlines) . splitBy (all (`elem` (" \t" :: String))) . lines codeblock :: [String] -> Maybe String -> String -> String -> RSTParser m Blocks codeblock classes numberLines lang body = return $ B.codeBlockWith attribs $ stripTrailingNewlines body where attribs = ("", classes', kvs) classes' = "sourceCode" : lang : maybe [] (\_ -> ["numberLines"]) numberLines ++ classes kvs = case numberLines of Just "" -> [] Nothing -> [] Just n -> [("startFrom",trim n)] --- --- note block --- noteBlock :: Monad m => RSTParser m [Char] noteBlock = try $ do startPos <- getPosition string ".." spaceChar >> skipMany spaceChar ref <- noteMarker first <- (spaceChar >> skipMany spaceChar >> anyLine) <|> (newline >> return "") blanks <- option "" blanklines rest <- option "" indentedBlock endPos <- getPosition let raw = first ++ "\n" ++ blanks ++ rest ++ "\n" let newnote = (ref, raw) st <- getState let oldnotes = stateNotes st updateState $ \s -> s { stateNotes = newnote : oldnotes } -- return blanks so line count isn't affected return $ replicate (sourceLine endPos - sourceLine startPos) '\n' noteMarker :: Monad m => RSTParser m [Char] noteMarker = do char '[' res <- many1 digit <|> (try $ char '#' >> liftM ('#':) simpleReferenceName') <|> count 1 (oneOf "#*") char ']' return res -- -- reference key -- quotedReferenceName :: PandocMonad m => RSTParser m Inlines quotedReferenceName = try $ do char '`' >> notFollowedBy (char '`') -- `` means inline code! label' <- trimInlines . mconcat <$> many1Till inline (char '`') return label' unquotedReferenceName :: PandocMonad m => RSTParser m Inlines unquotedReferenceName = try $ do label' <- trimInlines . mconcat <$> many1Till inline (lookAhead $ char ':') return label' -- Simple reference names are single words consisting of alphanumerics -- plus isolated (no two adjacent) internal hyphens, underscores, -- periods, colons and plus signs; no whitespace or other characters -- are allowed. simpleReferenceName' :: Monad m => ParserT [Char] st m String simpleReferenceName' = do x <- alphaNum xs <- many $ alphaNum <|> (try $ oneOf "-_:+." <* lookAhead alphaNum) return (x:xs) simpleReferenceName :: Monad m => ParserT [Char] st m Inlines simpleReferenceName = do raw <- simpleReferenceName' return $ B.str raw referenceName :: PandocMonad m => RSTParser m Inlines referenceName = quotedReferenceName <|> (try $ simpleReferenceName <* lookAhead (char ':')) <|> unquotedReferenceName referenceKey :: PandocMonad m => RSTParser m [Char] referenceKey = do startPos <- getPosition choice [substKey, anonymousKey, regularKey] optional blanklines endPos <- getPosition -- return enough blanks to replace key return $ replicate (sourceLine endPos - sourceLine startPos) '\n' targetURI :: Monad m => ParserT [Char] st m [Char] targetURI = do skipSpaces optional newline contents <- many1 (try (many spaceChar >> newline >> many1 spaceChar >> noneOf " \t\n") <|> noneOf "\n") blanklines return $ escapeURI $ trim $ contents substKey :: PandocMonad m => RSTParser m () substKey = try $ do string ".." skipMany1 spaceChar (alt,ref) <- withRaw $ trimInlines . mconcat <$> enclosed (char '|') (char '|') inline res <- B.toList <$> directive' il <- case res of -- use alt unless :alt: attribute on image: [Para [Image attr [Str "image"] (src,tit)]] -> return $ B.imageWith attr src tit alt [Para [Link _ [Image attr [Str "image"] (src,tit)] (src',tit')]] -> return $ B.link src' tit' (B.imageWith attr src tit alt) [Para ils] -> return $ B.fromList ils _ -> mzero let key = toKey $ stripFirstAndLast ref updateState $ \s -> s{ stateSubstitutions = M.insert key il $ stateSubstitutions s } anonymousKey :: Monad m => RSTParser m () anonymousKey = try $ do oneOfStrings [".. __:", "__"] src <- targetURI pos <- getPosition let key = toKey $ "_" ++ printf "%09d" (sourceLine pos) --TODO: parse width, height, class and name attributes updateState $ \s -> s { stateKeys = M.insert key ((src,""), nullAttr) $ stateKeys s } stripTicks :: String -> String stripTicks = reverse . stripTick . reverse . stripTick where stripTick ('`':xs) = xs stripTick xs = xs regularKey :: PandocMonad m => RSTParser m () regularKey = try $ do string ".. _" (_,ref) <- withRaw referenceName char ':' src <- targetURI let key = toKey $ stripTicks ref --TODO: parse width, height, class and name attributes updateState $ \s -> s { stateKeys = M.insert key ((src,""), nullAttr) $ stateKeys s } -- -- tables -- -- General tables TODO: -- - figure out if leading spaces are acceptable and if so, add -- support for them -- -- Simple tables TODO: -- - column spans -- - multiline support -- - ensure that rightmost column span does not need to reach end -- - require at least 2 columns -- -- Grid tables TODO: -- - column spans dashedLine :: Monad m => Char -> ParserT [Char] st m (Int, Int) dashedLine ch = do dashes <- many1 (char ch) sp <- many (char ' ') return (length dashes, length $ dashes ++ sp) simpleDashedLines :: Monad m => Char -> ParserT [Char] st m [(Int,Int)] simpleDashedLines ch = try $ many1 (dashedLine ch) -- Parse a table row separator simpleTableSep :: Monad m => Char -> RSTParser m Char simpleTableSep ch = try $ simpleDashedLines ch >> newline -- Parse a table footer simpleTableFooter :: Monad m => RSTParser m [Char] simpleTableFooter = try $ simpleTableSep '=' >> blanklines -- Parse a raw line and split it into chunks by indices. simpleTableRawLine :: Monad m => [Int] -> RSTParser m [String] simpleTableRawLine indices = do line <- many1Till anyChar newline return (simpleTableSplitLine indices line) -- Parse a table row and return a list of blocks (columns). simpleTableRow :: PandocMonad m => [Int] -> RSTParser m [[Block]] simpleTableRow indices = do notFollowedBy' simpleTableFooter firstLine <- simpleTableRawLine indices colLines <- return [] -- TODO let cols = map unlines . transpose $ firstLine : colLines mapM (parseFromString (B.toList . mconcat <$> many plain)) cols simpleTableSplitLine :: [Int] -> String -> [String] simpleTableSplitLine indices line = map trim $ tail $ splitByIndices (init indices) line simpleTableHeader :: PandocMonad m => Bool -- ^ Headerless table -> RSTParser m ([[Block]], [Alignment], [Int]) simpleTableHeader headless = try $ do optional blanklines rawContent <- if headless then return "" else simpleTableSep '=' >> anyLine dashes <- simpleDashedLines '=' <|> simpleDashedLines '-' newline let lines' = map snd dashes let indices = scanl (+) 0 lines' let aligns = replicate (length lines') AlignDefault let rawHeads = if headless then replicate (length dashes) "" else simpleTableSplitLine indices rawContent heads <- mapM (parseFromString (B.toList . mconcat <$> many plain)) $ map trim rawHeads return (heads, aligns, indices) -- Parse a simple table. simpleTable :: PandocMonad m => Bool -- ^ Headerless table -> RSTParser m Blocks simpleTable headless = do Table c a _w h l <- tableWith (simpleTableHeader headless) simpleTableRow sep simpleTableFooter -- Simple tables get 0s for relative column widths (i.e., use default) return $ B.singleton $ Table c a (replicate (length a) 0) h l where sep = return () -- optional (simpleTableSep '-') gridTable :: PandocMonad m => Bool -- ^ Headerless table -> RSTParser m Blocks gridTable headerless = B.singleton <$> gridTableWith (B.toList <$> parseBlocks) headerless table :: PandocMonad m => RSTParser m Blocks table = gridTable False <|> simpleTable False <|> gridTable True <|> simpleTable True "table" -- -- inline -- inline :: PandocMonad m => RSTParser m Inlines inline = choice [ note -- can start with whitespace, so try before ws , whitespace , link , str , endline , strong , emph , code , subst , interpretedRole , smart , hyphens , escapedChar , symbol ] "inline" parseInlineFromString :: PandocMonad m => String -> RSTParser m Inlines parseInlineFromString = parseFromString (trimInlines . mconcat <$> many inline) hyphens :: Monad m => RSTParser m Inlines hyphens = do result <- many1 (char '-') optional endline -- don't want to treat endline after hyphen or dash as a space return $ B.str result escapedChar :: Monad m => ParserT [Char] st m Inlines escapedChar = do c <- escaped anyChar return $ if c == ' ' -- '\ ' is null in RST then mempty else B.str [c] symbol :: Monad m => RSTParser m Inlines symbol = do result <- oneOf specialChars return $ B.str [result] -- parses inline code, between codeStart and codeEnd code :: Monad m => RSTParser m Inlines code = try $ do string "``" result <- manyTill anyChar (try (string "``")) return $ B.code $ trim $ unwords $ lines result -- succeeds only if we're not right after a str (ie. in middle of word) atStart :: Monad m => RSTParser m a -> RSTParser m a atStart p = do pos <- getPosition st <- getState -- single quote start can't be right after str guard $ stateLastStrPos st /= Just pos p emph :: PandocMonad m => RSTParser m Inlines emph = B.emph . trimInlines . mconcat <$> enclosed (atStart $ char '*') (char '*') inline strong :: PandocMonad m => RSTParser m Inlines strong = B.strong . trimInlines . mconcat <$> enclosed (atStart $ string "**") (try $ string "**") inline -- Note, this doesn't precisely implement the complex rule in -- http://docutils.sourceforge.net/docs/ref/rst/restructuredtext.html#inline-markup-recognition-rules -- but it should be good enough for most purposes -- -- TODO: -- - Classes are silently discarded in addNewRole -- - Lacks sensible implementation for title-reference (which is the default) -- - Allows direct use of the :raw: role, rST only allows inherited use. interpretedRole :: PandocMonad m => RSTParser m Inlines interpretedRole = try $ do (role, contents) <- roleBefore <|> roleAfter renderRole contents Nothing role nullAttr renderRole :: PandocMonad m => String -> Maybe String -> String -> Attr -> RSTParser m Inlines renderRole contents fmt role attr = case role of "sup" -> return $ B.superscript $ B.str contents "superscript" -> return $ B.superscript $ B.str contents "sub" -> return $ B.subscript $ B.str contents "subscript" -> return $ B.subscript $ B.str contents "emphasis" -> return $ B.emph $ B.str contents "strong" -> return $ B.strong $ B.str contents "rfc-reference" -> return $ rfcLink contents "RFC" -> return $ rfcLink contents "pep-reference" -> return $ pepLink contents "PEP" -> return $ pepLink contents "literal" -> return $ B.codeWith attr contents "math" -> return $ B.math contents "title-reference" -> titleRef contents "title" -> titleRef contents "t" -> titleRef contents "code" -> return $ B.codeWith (addClass "sourceCode" attr) contents "span" -> return $ B.spanWith attr $ B.str contents "raw" -> return $ B.rawInline (fromMaybe "" fmt) contents custom -> do customRoles <- stateRstCustomRoles <$> getState case M.lookup custom customRoles of Just (newRole, newFmt, newAttr) -> renderRole contents newFmt newRole newAttr Nothing -> do pos <- getPosition P.addWarningWithPos (Just pos) $ "ignoring unknown role :" ++ custom ++ ": in" return $ B.str contents -- Undefined role where titleRef ref = return $ B.str ref -- FIXME: Not a sensible behaviour rfcLink rfcNo = B.link rfcUrl ("RFC " ++ rfcNo) $ B.str ("RFC " ++ rfcNo) where rfcUrl = "http://www.faqs.org/rfcs/rfc" ++ rfcNo ++ ".html" pepLink pepNo = B.link pepUrl ("PEP " ++ pepNo) $ B.str ("PEP " ++ pepNo) where padNo = replicate (4 - length pepNo) '0' ++ pepNo pepUrl = "http://www.python.org/dev/peps/pep-" ++ padNo ++ "/" addClass :: String -> Attr -> Attr addClass c (ident, classes, keyValues) = (ident, union classes [c], keyValues) roleName :: PandocMonad m => RSTParser m String roleName = many1 (letter <|> char '-') roleMarker :: PandocMonad m => RSTParser m String roleMarker = char ':' *> roleName <* char ':' roleBefore :: PandocMonad m => RSTParser m (String,String) roleBefore = try $ do role <- roleMarker contents <- unmarkedInterpretedText return (role,contents) roleAfter :: PandocMonad m => RSTParser m (String,String) roleAfter = try $ do contents <- unmarkedInterpretedText role <- roleMarker <|> (stateRstDefaultRole <$> getState) return (role,contents) unmarkedInterpretedText :: PandocMonad m => RSTParser m [Char] unmarkedInterpretedText = enclosed (atStart $ char '`') (char '`') anyChar whitespace :: PandocMonad m => RSTParser m Inlines whitespace = B.space <$ skipMany1 spaceChar "whitespace" str :: Monad m => RSTParser m Inlines str = do let strChar = noneOf ("\t\n " ++ specialChars) result <- many1 strChar updateLastStrPos return $ B.str result -- an endline character that can be treated as a space, not a structural break endline :: Monad m => RSTParser m Inlines endline = try $ do newline notFollowedBy blankline -- parse potential list-starts at beginning of line differently in a list: st <- getState if (stateParserContext st) == ListItemState then notFollowedBy (anyOrderedListMarker >> spaceChar) >> notFollowedBy' bulletListStart else return () return B.softbreak -- -- links -- link :: PandocMonad m => RSTParser m Inlines link = choice [explicitLink, referenceLink, autoLink] "link" explicitLink :: PandocMonad m => RSTParser m Inlines explicitLink = try $ do char '`' notFollowedBy (char '`') -- `` marks start of inline code label' <- trimInlines . mconcat <$> manyTill (notFollowedBy (char '`') >> inline) (char '<') src <- trim <$> manyTill (noneOf ">\n") (char '>') skipSpaces string "`_" optional $ char '_' -- anonymous form let label'' = if label' == mempty then B.str src else label' -- `link ` is a reference link to _google! (src',tit,attr) <- case reverse src of '_':xs -> do keyTable <- stateKeys <$> getState let key = toKey $ reverse xs case M.lookup key keyTable of Nothing -> do pos <- getPosition addWarning (Just pos) $ "Could not find reference for " ++ show key return ("","",nullAttr) Just ((s,t),a) -> return (s,t,a) _ -> return (src, "", nullAttr) return $ B.linkWith attr (escapeURI src') tit label'' referenceLink :: PandocMonad m => RSTParser m Inlines referenceLink = try $ do (label',ref) <- withRaw (quotedReferenceName <|> simpleReferenceName) <* char '_' state <- getState let keyTable = stateKeys state let isAnonKey (Key ('_':_)) = True isAnonKey _ = False key <- option (toKey $ stripTicks ref) $ do char '_' let anonKeys = sort $ filter isAnonKey $ M.keys keyTable if null anonKeys then mzero else return (head anonKeys) ((src,tit), attr) <- case M.lookup key keyTable of Nothing -> do pos <- getPosition addWarning (Just pos) $ "Could not find reference for " ++ show key return (("",""),nullAttr) Just val -> return val -- if anonymous link, remove key so it won't be used again when (isAnonKey key) $ updateState $ \s -> s{ stateKeys = M.delete key keyTable } return $ B.linkWith attr src tit label' autoURI :: Monad m => RSTParser m Inlines autoURI = do (orig, src) <- uri return $ B.link src "" $ B.str orig autoEmail :: Monad m => RSTParser m Inlines autoEmail = do (orig, src) <- emailAddress return $ B.link src "" $ B.str orig autoLink :: PandocMonad m => RSTParser m Inlines autoLink = autoURI <|> autoEmail subst :: PandocMonad m => RSTParser m Inlines subst = try $ do (_,ref) <- withRaw $ enclosed (char '|') (char '|') inline state <- getState let substTable = stateSubstitutions state let key = toKey $ stripFirstAndLast ref case M.lookup key substTable of Nothing -> do pos <- getPosition addWarning (Just pos) $ "Could not find reference for " ++ show key return mempty Just target -> return target note :: PandocMonad m => RSTParser m Inlines note = try $ do optional whitespace ref <- noteMarker char '_' state <- getState let notes = stateNotes state case lookup ref notes of Nothing -> do pos <- getPosition addWarning (Just pos) $ "Could not find note for " ++ show ref return mempty Just raw -> do -- We temporarily empty the note list while parsing the note, -- so that we don't get infinite loops with notes inside notes... -- Note references inside other notes are allowed in reST, but -- not yet in this implementation. updateState $ \st -> st{ stateNotes = [] } contents <- parseFromString parseBlocks raw let newnotes = if (ref == "*" || ref == "#") -- auto-numbered -- delete the note so the next auto-numbered note -- doesn't get the same contents: then deleteFirstsBy (==) notes [(ref,raw)] else notes updateState $ \st -> st{ stateNotes = newnotes } return $ B.note contents smart :: PandocMonad m => RSTParser m Inlines smart = do getOption readerSmart >>= guard doubleQuoted <|> singleQuoted <|> choice [apostrophe, dash, ellipses] singleQuoted :: PandocMonad m => RSTParser m Inlines singleQuoted = try $ do singleQuoteStart withQuoteContext InSingleQuote $ B.singleQuoted . trimInlines . mconcat <$> many1Till inline singleQuoteEnd doubleQuoted :: PandocMonad m => RSTParser m Inlines doubleQuoted = try $ do doubleQuoteStart withQuoteContext InDoubleQuote $ B.doubleQuoted . trimInlines . mconcat <$> many1Till inline doubleQuoteEnd