{-# LANGUAGE NoImplicitPrelude #-} {-# LANGUAGE MultiWayIf #-} {-# LANGUAGE OverloadedStrings #-} {-# LANGUAGE ScopedTypeVariables #-} {-# LANGUAGE TupleSections #-} {- Copyright (C) 2006-2018 John MacFarlane <jgm@berkeley.edu> This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA -} {- | Module : Text.Pandoc.Writers.Markdown Copyright : Copyright (C) 2006-2018 John MacFarlane License : GNU GPL, version 2 or above Maintainer : John MacFarlane <jgm@berkeley.edu> Stability : alpha Portability : portable Conversion of 'Pandoc' documents to markdown-formatted plain text. Markdown: <http://daringfireball.net/projects/markdown/> -} module Text.Pandoc.Writers.Markdown (writeMarkdown, writePlain) where import Prelude import Control.Monad.Reader import Control.Monad.State.Strict import Data.Char (chr, isPunctuation, isSpace, ord, isAlphaNum) import Data.Default import qualified Data.HashMap.Strict as H import Data.List (find, group, intersperse, sortBy, stripPrefix, transpose) import qualified Data.Map as M import Data.Maybe (fromMaybe) import Data.Monoid (Any (..)) import Data.Ord (comparing) import qualified Data.Set as Set import Data.Text (Text) import qualified Data.Text as T import qualified Data.Vector as V import Data.Aeson (Value (Array, Bool, Number, Object, String)) import Network.HTTP (urlEncode) import Text.HTML.TagSoup (Tag (..), isTagText, parseTags) import Text.Pandoc.Class (PandocMonad, report) import Text.Pandoc.Definition import Text.Pandoc.Logging import Text.Pandoc.Options import Text.Pandoc.Parsing hiding (blankline, blanklines, char, space) import Text.Pandoc.Pretty import Text.Pandoc.Shared import Text.Pandoc.Templates (renderTemplate') import Text.Pandoc.Walk import Text.Pandoc.Writers.HTML (writeHtml5String) import Text.Pandoc.Writers.Math (texMathToInlines) import Text.Pandoc.Writers.Shared type Notes = [[Block]] type Ref = (Doc, Target, Attr) type Refs = [Ref] type MD m = ReaderT WriterEnv (StateT WriterState m) evalMD :: PandocMonad m => MD m a -> WriterEnv -> WriterState -> m a evalMD md env st = evalStateT (runReaderT md env) st data WriterEnv = WriterEnv { envInList :: Bool , envPlain :: Bool , envRefShortcutable :: Bool , envBlockLevel :: Int , envEscapeSpaces :: Bool } instance Default WriterEnv where def = WriterEnv { envInList = False , envPlain = False , envRefShortcutable = True , envBlockLevel = 0 , envEscapeSpaces = False } data WriterState = WriterState { stNotes :: Notes , stRefs :: Refs , stKeys :: M.Map Key (M.Map (Target, Attr) Int) , stLastIdx :: Int , stIds :: Set.Set String , stNoteNum :: Int } instance Default WriterState where def = WriterState{ stNotes = [] , stRefs = [] , stKeys = M.empty , stLastIdx = 0 , stIds = Set.empty , stNoteNum = 1 } -- | Convert Pandoc to Markdown. writeMarkdown :: PandocMonad m => WriterOptions -> Pandoc -> m Text writeMarkdown opts document = evalMD (pandocToMarkdown opts{ writerWrapText = if isEnabled Ext_hard_line_breaks opts then WrapNone else writerWrapText opts } document) def def -- | Convert Pandoc to plain text (like markdown, but without links, -- pictures, or inline formatting). writePlain :: PandocMonad m => WriterOptions -> Pandoc -> m Text writePlain opts document = evalMD (pandocToMarkdown opts document) def{ envPlain = True } def pandocTitleBlock :: Doc -> [Doc] -> Doc -> Doc pandocTitleBlock tit auths dat = hang 2 (text "% ") tit <> cr <> hang 2 (text "% ") (vcat $ map nowrap auths) <> cr <> hang 2 (text "% ") dat <> cr mmdTitleBlock :: Value -> Doc mmdTitleBlock (Object hashmap) = vcat $ map go $ sortBy (comparing fst) $ H.toList hashmap where go (k,v) = case (text (T.unpack k), v) of (k', Array vec) | V.null vec -> empty | otherwise -> k' <> ":" <> space <> hcat (intersperse "; " (map fromstr $ V.toList vec)) (_, String "") -> empty (k', x) -> k' <> ":" <> space <> nest 2 (fromstr x) fromstr (String s) = text (removeBlankLines $ T.unpack s) fromstr (Bool b) = text (show b) fromstr (Number n) = text (show n) fromstr _ = empty -- blank lines not allowed in MMD metadata - we replace with . removeBlankLines = trimr . unlines . map (\x -> if all isSpace x then "." else x) . lines mmdTitleBlock _ = empty plainTitleBlock :: Doc -> [Doc] -> Doc -> Doc plainTitleBlock tit auths dat = tit <> cr <> (hcat (intersperse (text "; ") auths)) <> cr <> dat <> cr yamlMetadataBlock :: Value -> Doc yamlMetadataBlock v = "---" $$ (jsonToYaml v) $$ "---" jsonToYaml :: Value -> Doc jsonToYaml (Object hashmap) = vcat $ map (\(k,v) -> case (text (T.unpack k), v, jsonToYaml v) of (k', Array vec, x) | V.null vec -> empty | otherwise -> (k' <> ":") $$ x (k', Object _, x) -> (k' <> ":") $$ nest 2 x (_, String "", _) -> empty (k', _, x) -> k' <> ":" <> space <> hang 2 "" x) $ sortBy (comparing fst) $ H.toList hashmap jsonToYaml (Array vec) = vcat $ map (\v -> hang 2 "- " (jsonToYaml v)) $ V.toList vec jsonToYaml (String "") = empty jsonToYaml (String s) = case T.unpack s of x | '\n' `elem` x -> hang 2 ("|" <> cr) $ text x | not (any isPunctuation x) -> text x | otherwise -> text $ "'" ++ substitute "'" "''" x ++ "'" jsonToYaml (Bool b) = text $ show b jsonToYaml (Number n) = text $ show n jsonToYaml _ = empty -- | Return markdown representation of document. pandocToMarkdown :: PandocMonad m => WriterOptions -> Pandoc -> MD m Text pandocToMarkdown opts (Pandoc meta blocks) = do let colwidth = if writerWrapText opts == WrapAuto then Just $ writerColumns opts else Nothing isPlain <- asks envPlain let render' :: Doc -> Text render' = render colwidth . chomp metadata <- metaToJSON' (fmap render' . blockListToMarkdown opts) (fmap render' . blockToMarkdown opts . Plain) meta let title' = maybe empty text $ getField "title" metadata let authors' = maybe [] (map text) $ getField "author" metadata let date' = maybe empty text $ getField "date" metadata let titleblock = case writerTemplate opts of Just _ | isPlain -> plainTitleBlock title' authors' date' | isEnabled Ext_yaml_metadata_block opts -> yamlMetadataBlock metadata | isEnabled Ext_pandoc_title_block opts -> pandocTitleBlock title' authors' date' | isEnabled Ext_mmd_title_block opts -> mmdTitleBlock metadata | otherwise -> empty Nothing -> empty let headerBlocks = filter isHeaderBlock blocks toc <- if writerTableOfContents opts then render' <$> tableOfContents opts headerBlocks else return "" -- Strip off final 'references' header if markdown citations enabled let blocks' = if isEnabled Ext_citations opts then case reverse blocks of (Div (_,["references"],_) _):xs -> reverse xs _ -> blocks else blocks body <- blockListToMarkdown opts blocks' notesAndRefs' <- notesAndRefs opts let main = render' $ body <> notesAndRefs' let context = -- for backwards compatibility we populate toc -- with the contents of the toc, rather than a -- boolean: defField "toc" toc $ defField "table-of-contents" toc $ defField "body" main $ (if isNullMeta meta then id else defField "titleblock" (render' titleblock)) $ addVariablesToJSON opts metadata case writerTemplate opts of Nothing -> return main Just tpl -> renderTemplate' tpl context -- | Return markdown representation of reference key table. refsToMarkdown :: PandocMonad m => WriterOptions -> Refs -> MD m Doc refsToMarkdown opts refs = mapM (keyToMarkdown opts) refs >>= return . vcat -- | Return markdown representation of a reference key. keyToMarkdown :: PandocMonad m => WriterOptions -> Ref -> MD m Doc keyToMarkdown opts (label', (src, tit), attr) = do let tit' = if null tit then empty else space <> "\"" <> text tit <> "\"" return $ nest 2 $ hang 2 ("[" <> label' <> "]:" <> space) (text src <> tit') <+> linkAttributes opts attr -- | Return markdown representation of notes. notesToMarkdown :: PandocMonad m => WriterOptions -> [[Block]] -> MD m Doc notesToMarkdown opts notes = do n <- gets stNoteNum notes' <- mapM (\(num, note) -> noteToMarkdown opts num note) (zip [n..] notes) modify $ \st -> st { stNoteNum = stNoteNum st + length notes } return $ vsep notes' -- | Return markdown representation of a note. noteToMarkdown :: PandocMonad m => WriterOptions -> Int -> [Block] -> MD m Doc noteToMarkdown opts num blocks = do contents <- blockListToMarkdown opts blocks let num' = text $ writerIdentifierPrefix opts ++ show num let marker = if isEnabled Ext_footnotes opts then text "[^" <> num' <> text "]:" else text "[" <> num' <> text "]" let markerSize = 4 + offset num' let spacer = case writerTabStop opts - markerSize of n | n > 0 -> text $ replicate n ' ' _ -> text " " return $ if isEnabled Ext_footnotes opts then hang (writerTabStop opts) (marker <> spacer) contents else marker <> spacer <> contents -- | Escape special characters for Markdown. escapeString :: WriterOptions -> String -> String escapeString _ [] = [] escapeString opts (c:cs) = case c of '<' | isEnabled Ext_all_symbols_escapable opts -> '\\' : '<' : escapeString opts cs | otherwise -> "<" ++ escapeString opts cs '>' | isEnabled Ext_all_symbols_escapable opts -> '\\' : '>' : escapeString opts cs | otherwise -> ">" ++ escapeString opts cs '@' | isEnabled Ext_citations opts -> case cs of (d:_) | isAlphaNum d || d == '_' -> '\\':'@':escapeString opts cs _ -> '@':escapeString opts cs _ | c `elem` ['\\','`','*','_','[',']','#'] -> '\\':c:escapeString opts cs '|' | isEnabled Ext_pipe_tables opts -> '\\':'|':escapeString opts cs '^' | isEnabled Ext_superscript opts -> '\\':'^':escapeString opts cs '~' | isEnabled Ext_subscript opts || isEnabled Ext_strikeout opts -> '\\':'~':escapeString opts cs '$' | isEnabled Ext_tex_math_dollars opts -> '\\':'$':escapeString opts cs '\'' | isEnabled Ext_smart opts -> '\\':'\'':escapeString opts cs '"' | isEnabled Ext_smart opts -> '\\':'"':escapeString opts cs '-' | isEnabled Ext_smart opts -> case cs of '-':_ -> '\\':'-':escapeString opts cs _ -> '-':escapeString opts cs '.' | isEnabled Ext_smart opts -> case cs of '.':'.':rest -> '\\':'.':'.':'.':escapeString opts rest _ -> '.':escapeString opts cs _ -> c : escapeString opts cs -- | Construct table of contents from list of header blocks. tableOfContents :: PandocMonad m => WriterOptions -> [Block] -> MD m Doc tableOfContents opts headers = do contents <- BulletList <$> mapM (elementToListItem opts) (hierarchicalize headers) blockToMarkdown opts contents -- | Converts an Element to a list item for a table of contents, elementToListItem :: PandocMonad m => WriterOptions -> Element -> MD m [Block] elementToListItem opts (Sec lev _nums (ident,_,_) headerText subsecs) = do isPlain <- asks envPlain let headerLink = if null ident || isPlain then walk deNote headerText else [Link nullAttr (walk deNote headerText) ('#':ident, "")] listContents <- if null subsecs || lev >= writerTOCDepth opts then return [] else mapM (elementToListItem opts) subsecs return [Plain headerLink, BulletList listContents] elementToListItem _ (Blk _) = return [] attrsToMarkdown :: Attr -> Doc attrsToMarkdown attribs = braces $ hsep [attribId, attribClasses, attribKeys] where attribId = case attribs of ([],_,_) -> empty (i,_,_) -> "#" <> text i attribClasses = case attribs of (_,[],_) -> empty (_,cs,_) -> hsep $ map (text . ('.':)) cs attribKeys = case attribs of (_,_,[]) -> empty (_,_,ks) -> hsep $ map (\(k,v) -> text k <> "=\"" <> text v <> "\"") ks linkAttributes :: WriterOptions -> Attr -> Doc linkAttributes opts attr = if isEnabled Ext_link_attributes opts && attr /= nullAttr then attrsToMarkdown attr else empty -- | Ordered list start parser for use in Para below. olMarker :: Parser [Char] ParserState Char olMarker = do (start, style', delim) <- anyOrderedListMarker if delim == Period && (style' == UpperAlpha || (style' == UpperRoman && start `elem` [1, 5, 10, 50, 100, 500, 1000])) then spaceChar >> spaceChar else spaceChar -- | True if string begins with an ordered list marker beginsWithOrderedListMarker :: String -> Bool beginsWithOrderedListMarker str = case runParser olMarker defaultParserState "para start" (take 10 str) of Left _ -> False Right _ -> True notesAndRefs :: PandocMonad m => WriterOptions -> MD m Doc notesAndRefs opts = do notes' <- reverse <$> gets stNotes >>= notesToMarkdown opts modify $ \s -> s { stNotes = [] } refs' <- reverse <$> gets stRefs >>= refsToMarkdown opts modify $ \s -> s { stRefs = [] } let endSpacing = if | writerReferenceLocation opts == EndOfDocument -> empty | isEmpty notes' && isEmpty refs' -> empty | otherwise -> blankline return $ (if isEmpty notes' then empty else blankline <> notes') <> (if isEmpty refs' then empty else blankline <> refs') <> endSpacing -- | Convert Pandoc block element to markdown. blockToMarkdown :: PandocMonad m => WriterOptions -- ^ Options -> Block -- ^ Block element -> MD m Doc blockToMarkdown opts blk = local (\env -> env {envBlockLevel = envBlockLevel env + 1}) $ do doc <- blockToMarkdown' opts blk blkLevel <- asks envBlockLevel if writerReferenceLocation opts == EndOfBlock && blkLevel == 1 then notesAndRefs opts >>= (\d -> return $ doc <> d) else return doc blockToMarkdown' :: PandocMonad m => WriterOptions -- ^ Options -> Block -- ^ Block element -> MD m Doc blockToMarkdown' _ Null = return empty blockToMarkdown' opts (Div attrs ils) = do contents <- blockListToMarkdown opts ils return $ case () of _ | isEnabled Ext_fenced_divs opts && attrs /= nullAttr -> nowrap (text ":::" <+> attrsToMarkdown attrs) $$ chomp contents $$ text ":::" <> blankline | isEnabled Ext_native_divs opts || (isEnabled Ext_raw_html opts && isEnabled Ext_markdown_in_html_blocks opts) -> tagWithAttrs "div" attrs <> blankline <> contents <> blankline <> "</div>" <> blankline | otherwise -> contents <> blankline blockToMarkdown' opts (Plain inlines) = do contents <- inlineListToMarkdown opts inlines -- escape if para starts with ordered list marker isPlain <- asks envPlain let colwidth = if writerWrapText opts == WrapAuto then Just $ writerColumns opts else Nothing let rendered = render colwidth contents let escapeMarker (x:xs) | x `elem` (".()" :: String) = '\\':x:xs | otherwise = x : escapeMarker xs escapeMarker [] = [] let contents' = case rendered of '%':_ | isEnabled Ext_pandoc_title_block opts && isEnabled Ext_all_symbols_escapable opts -> "\\" <> contents '+':s:_ | not isPlain && isSpace s -> "\\" <> contents '*':s:_ | not isPlain && isSpace s -> "\\" <> contents '-':s:_ | not isPlain && isSpace s -> "\\" <> contents '+':[] | not isPlain -> "\\" <> contents '*':[] | not isPlain -> "\\" <> contents '-':[] | not isPlain -> "\\" <> contents '|':_ | (isEnabled Ext_line_blocks opts || isEnabled Ext_pipe_tables opts) && isEnabled Ext_all_symbols_escapable opts -> "\\" <> contents _ | not isPlain && beginsWithOrderedListMarker rendered && isEnabled Ext_all_symbols_escapable opts -> text $ escapeMarker rendered | otherwise -> contents return $ contents' <> cr -- title beginning with fig: indicates figure blockToMarkdown' opts (Para [Image attr alt (src,'f':'i':'g':':':tit)]) | isEnabled Ext_raw_html opts && not (isEnabled Ext_link_attributes opts) && attr /= nullAttr = -- use raw HTML (text . T.unpack . T.strip) <$> writeHtml5String opts{ writerTemplate = Nothing } (Pandoc nullMeta [Para [Image attr alt (src,"fig:" ++ tit)]]) | otherwise = blockToMarkdown opts (Para [Image attr alt (src,tit)]) blockToMarkdown' opts (Para inlines) = (<> blankline) `fmap` blockToMarkdown opts (Plain inlines) blockToMarkdown' opts (LineBlock lns) = if isEnabled Ext_line_blocks opts then do mdLines <- mapM (inlineListToMarkdown opts) lns return $ (vcat $ map (hang 2 (text "| ")) mdLines) <> blankline else blockToMarkdown opts $ linesToPara lns blockToMarkdown' opts b@(RawBlock f str) | f `elem` ["markdown", "markdown_github", "markdown_phpextra", "markdown_mmd", "markdown_strict"] = return $ text str <> text "\n" | f `elem` ["html", "html5", "html4"] && isEnabled Ext_raw_html opts = do plain <- asks envPlain return $ if plain then empty else if isEnabled Ext_markdown_attribute opts then text (addMarkdownAttribute str) <> text "\n" else text str <> text "\n" | f `elem` ["latex", "tex"] && isEnabled Ext_raw_tex opts = do plain <- asks envPlain return $ if plain then empty else text str <> text "\n" | otherwise = do report $ BlockNotRendered b return empty blockToMarkdown' opts HorizontalRule = do return $ blankline <> text (replicate (writerColumns opts) '-') <> blankline blockToMarkdown' opts (Header level attr inlines) = do -- first, if we're putting references at the end of a section, we -- put them here. blkLevel <- asks envBlockLevel refs <- if writerReferenceLocation opts == EndOfSection && blkLevel == 1 then notesAndRefs opts else return empty plain <- asks envPlain -- we calculate the id that would be used by auto_identifiers -- so we know whether to print an explicit identifier ids <- gets stIds let autoId = uniqueIdent inlines ids modify $ \st -> st{ stIds = Set.insert autoId ids } let attr' = case attr of ("",[],[]) -> empty (id',[],[]) | isEnabled Ext_auto_identifiers opts && id' == autoId -> empty (id',_,_) | isEnabled Ext_mmd_header_identifiers opts -> space <> brackets (text id') _ | isEnabled Ext_header_attributes opts -> space <> attrsToMarkdown attr | otherwise -> empty contents <- inlineListToMarkdown opts $ -- ensure no newlines; see #3736 walk lineBreakToSpace $ if level == 1 && plain then capitalize inlines else inlines let setext = writerSetextHeaders opts hdr = nowrap $ case level of 1 | plain -> blanklines 3 <> contents <> blanklines 2 | setext -> contents <> attr' <> cr <> text (replicate (offset contents) '=') <> blankline 2 | plain -> blanklines 2 <> contents <> blankline | setext -> contents <> attr' <> cr <> text (replicate (offset contents) '-') <> blankline -- ghc interprets '#' characters in column 1 as linenum specifiers. _ | plain || isEnabled Ext_literate_haskell opts -> contents <> blankline _ -> text (replicate level '#') <> space <> contents <> attr' <> blankline return $ refs <> hdr blockToMarkdown' opts (CodeBlock (_,classes,_) str) | "haskell" `elem` classes && "literate" `elem` classes && isEnabled Ext_literate_haskell opts = return $ prefixed "> " (text str) <> blankline blockToMarkdown' opts (CodeBlock attribs str) = return $ case attribs == nullAttr of False | isEnabled Ext_backtick_code_blocks opts -> backticks <> attrs <> cr <> text str <> cr <> backticks <> blankline | isEnabled Ext_fenced_code_blocks opts -> tildes <> attrs <> cr <> text str <> cr <> tildes <> blankline _ -> nest (writerTabStop opts) (text str) <> blankline where tildes = text $ case [ln | ln <- lines str, all (=='~') ln] of [] -> "~~~~" xs -> case maximum $ map length xs of n | n < 3 -> "~~~~" | otherwise -> replicate (n+1) '~' backticks = text $ case [ln | ln <- lines str, all (=='`') ln] of [] -> "```" xs -> case maximum $ map length xs of n | n < 3 -> "```" | otherwise -> replicate (n+1) '`' attrs = if isEnabled Ext_fenced_code_attributes opts then nowrap $ " " <> attrsToMarkdown attribs else case attribs of (_,(cls:_),_) -> " " <> text cls _ -> empty blockToMarkdown' opts (BlockQuote blocks) = do plain <- asks envPlain -- if we're writing literate haskell, put a space before the bird tracks -- so they won't be interpreted as lhs... let leader = if isEnabled Ext_literate_haskell opts then " > " else if plain then " " else "> " contents <- blockListToMarkdown opts blocks return $ (prefixed leader contents) <> blankline blockToMarkdown' opts t@(Table caption aligns widths headers rows) = do let numcols = maximum (length aligns : length widths : map length (headers:rows)) caption' <- inlineListToMarkdown opts caption let caption'' = if null caption || not (isEnabled Ext_table_captions opts) then blankline else blankline $$ (": " <> caption') $$ blankline let isLineBreak LineBreak = Any True isLineBreak _ = Any False let hasLineBreak = getAny . query isLineBreak let isSimpleCell [Plain ils] = not (hasLineBreak ils) isSimpleCell [Para ils ] = not (hasLineBreak ils) isSimpleCell [] = True isSimpleCell _ = False let hasSimpleCells = all isSimpleCell (concat (headers:rows)) let isSimple = hasSimpleCells && all (==0) widths let isPlainBlock (Plain _) = True isPlainBlock _ = False let hasBlocks = not (all isPlainBlock $ concat . concat $ headers:rows) let padRow r = case numcols - length r of x | x > 0 -> r ++ replicate x empty | otherwise -> r let aligns' = case numcols - length aligns of x | x > 0 -> aligns ++ replicate x AlignDefault | otherwise -> aligns let widths' = case numcols - length widths of x | x > 0 -> widths ++ replicate x 0.0 | otherwise -> widths (nst,tbl) <- case True of _ | isSimple && isEnabled Ext_simple_tables opts -> do rawHeaders <- padRow <$> mapM (blockListToMarkdown opts) headers rawRows <- mapM (fmap padRow . mapM (blockListToMarkdown opts)) rows (nest 2,) <$> pandocTable opts False (all null headers) aligns' widths' rawHeaders rawRows | isSimple && isEnabled Ext_pipe_tables opts -> do rawHeaders <- padRow <$> mapM (blockListToMarkdown opts) headers rawRows <- mapM (fmap padRow . mapM (blockListToMarkdown opts)) rows (id,) <$> pipeTable (all null headers) aligns' rawHeaders rawRows | not hasBlocks && isEnabled Ext_multiline_tables opts -> do rawHeaders <- padRow <$> mapM (blockListToMarkdown opts) headers rawRows <- mapM (fmap padRow . mapM (blockListToMarkdown opts)) rows (nest 2,) <$> pandocTable opts True (all null headers) aligns' widths' rawHeaders rawRows | isEnabled Ext_grid_tables opts && writerColumns opts >= 8 * numcols -> (id,) <$> gridTable opts blockListToMarkdown (all null headers) aligns' widths' headers rows | isEnabled Ext_raw_html opts -> fmap (id,) $ (text . T.unpack) <$> (writeHtml5String opts{ writerTemplate = Nothing } $ Pandoc nullMeta [t]) | hasSimpleCells && isEnabled Ext_pipe_tables opts -> do rawHeaders <- padRow <$> mapM (blockListToMarkdown opts) headers rawRows <- mapM (fmap padRow . mapM (blockListToMarkdown opts)) rows (id,) <$> pipeTable (all null headers) aligns' rawHeaders rawRows | otherwise -> return $ (id, text "[TABLE]") return $ nst $ tbl $$ caption'' $$ blankline blockToMarkdown' opts (BulletList items) = do contents <- inList $ mapM (bulletListItemToMarkdown opts) items return $ cat contents <> blankline blockToMarkdown' opts (OrderedList (start,sty,delim) items) = do let start' = if isEnabled Ext_startnum opts then start else 1 let sty' = if isEnabled Ext_fancy_lists opts then sty else DefaultStyle let delim' = if isEnabled Ext_fancy_lists opts then delim else DefaultDelim let attribs = (start', sty', delim') let markers = orderedListMarkers attribs let markers' = map (\m -> if length m < 3 then m ++ replicate (3 - length m) ' ' else m) markers contents <- inList $ mapM (\(item, num) -> orderedListItemToMarkdown opts item num) $ zip markers' items return $ cat contents <> blankline blockToMarkdown' opts (DefinitionList items) = do contents <- inList $ mapM (definitionListItemToMarkdown opts) items return $ cat contents <> blankline inList :: Monad m => MD m a -> MD m a inList p = local (\env -> env {envInList = True}) p addMarkdownAttribute :: String -> String addMarkdownAttribute s = case span isTagText $ reverse $ parseTags s of (xs,(TagOpen t attrs:rest)) -> renderTags' $ reverse rest ++ (TagOpen t attrs' : reverse xs) where attrs' = ("markdown","1"):[(x,y) | (x,y) <- attrs, x /= "markdown"] _ -> s pipeTable :: PandocMonad m => Bool -> [Alignment] -> [Doc] -> [[Doc]] -> MD m Doc pipeTable headless aligns rawHeaders rawRows = do let sp = text " " let blockFor AlignLeft x y = lblock (x + 2) (sp <> y) <> lblock 0 empty blockFor AlignCenter x y = cblock (x + 2) (sp <> y) <> lblock 0 empty blockFor AlignRight x y = rblock (x + 2) (sp <> y) <> lblock 0 empty blockFor _ x y = lblock (x + 2) (sp <> y) <> lblock 0 empty let widths = map (max 3 . maximum . map offset) $ transpose (rawHeaders : rawRows) let torow cs = nowrap $ text "|" <> hcat (intersperse (text "|") $ zipWith3 blockFor aligns widths (map chomp cs)) <> text "|" let toborder (a, w) = text $ case a of AlignLeft -> ':':replicate (w + 1) '-' AlignCenter -> ':':replicate w '-' ++ ":" AlignRight -> replicate (w + 1) '-' ++ ":" AlignDefault -> replicate (w + 2) '-' -- note: pipe tables can't completely lack a -- header; for a headerless table, we need a header of empty cells. -- see jgm/pandoc#1996. let header = if headless then torow (replicate (length aligns) empty) else torow rawHeaders let border = nowrap $ text "|" <> hcat (intersperse (text "|") $ map toborder $ zip aligns widths) <> text "|" let body = vcat $ map torow rawRows return $ header $$ border $$ body pandocTable :: PandocMonad m => WriterOptions -> Bool -> Bool -> [Alignment] -> [Double] -> [Doc] -> [[Doc]] -> MD m Doc pandocTable opts multiline headless aligns widths rawHeaders rawRows = do let isSimple = all (==0) widths let alignHeader alignment = case alignment of AlignLeft -> lblock AlignCenter -> cblock AlignRight -> rblock AlignDefault -> lblock -- Number of characters per column necessary to output every cell -- without requiring a line break. -- The @+2@ is needed for specifying the alignment. let numChars = (+ 2) . maximum . map offset -- Number of characters per column necessary to output every cell -- without requiring a line break *inside a word*. -- The @+2@ is needed for specifying the alignment. let minNumChars = (+ 2) . maximum . map minOffset let columns = transpose (rawHeaders : rawRows) -- minimal column width without wrapping a single word let relWidth w col = max (floor $ fromIntegral (writerColumns opts - 1) * w) (if writerWrapText opts == WrapAuto then minNumChars col else numChars col) let widthsInChars | isSimple = map numChars columns | otherwise = zipWith relWidth widths columns let makeRow = hcat . intersperse (lblock 1 (text " ")) . (zipWith3 alignHeader aligns widthsInChars) let rows' = map makeRow rawRows let head' = makeRow rawHeaders let underline = cat $ intersperse (text " ") $ map (\width -> text (replicate width '-')) widthsInChars let border = if multiline then text (replicate (sum widthsInChars + length widthsInChars - 1) '-') else if headless then underline else empty let head'' = if headless then empty else border <> cr <> head' let body = if multiline then vsep rows' $$ if length rows' < 2 then blankline -- #4578 else empty else vcat rows' let bottom = if headless then underline else border return $ head'' $$ underline $$ body $$ bottom itemEndsWithTightList :: [Block] -> Bool itemEndsWithTightList bs = case bs of [Plain _, BulletList xs] -> isTightList xs [Plain _, OrderedList _ xs] -> isTightList xs _ -> False -- | Convert bullet list item (list of blocks) to markdown. bulletListItemToMarkdown :: PandocMonad m => WriterOptions -> [Block] -> MD m Doc bulletListItemToMarkdown opts bs = do contents <- blockListToMarkdown opts bs let sps = replicate (writerTabStop opts - 2) ' ' let start = text ('-' : ' ' : sps) -- remove trailing blank line if item ends with a tight list let contents' = if itemEndsWithTightList bs then chomp contents <> cr else contents return $ hang (writerTabStop opts) start $ contents' <> cr -- | Convert ordered list item (a list of blocks) to markdown. orderedListItemToMarkdown :: PandocMonad m => WriterOptions -- ^ options -> String -- ^ list item marker -> [Block] -- ^ list item (list of blocks) -> MD m Doc orderedListItemToMarkdown opts marker bs = do contents <- blockListToMarkdown opts bs let sps = case length marker - writerTabStop opts of n | n > 0 -> text $ replicate n ' ' _ -> text " " let start = text marker <> sps -- remove trailing blank line if item ends with a tight list let contents' = if itemEndsWithTightList bs then chomp contents <> cr else contents return $ hang (writerTabStop opts) start $ contents' <> cr -- | Convert definition list item (label, list of blocks) to markdown. definitionListItemToMarkdown :: PandocMonad m => WriterOptions -> ([Inline],[[Block]]) -> MD m Doc definitionListItemToMarkdown opts (label, defs) = do labelText <- inlineListToMarkdown opts label defs' <- mapM (mapM (blockToMarkdown opts)) defs if isEnabled Ext_definition_lists opts then do let tabStop = writerTabStop opts isPlain <- asks envPlain let leader = if isPlain then " " else ": " let sps = case writerTabStop opts - 3 of n | n > 0 -> text $ replicate n ' ' _ -> text " " if isEnabled Ext_compact_definition_lists opts then do let contents = vcat $ map (\d -> hang tabStop (leader <> sps) $ vcat d <> cr) defs' return $ nowrap labelText <> cr <> contents <> cr else do let contents = vcat $ map (\d -> hang tabStop (leader <> sps) $ vcat d <> cr) defs' let isTight = case defs of ((Plain _ : _): _) -> True _ -> False return $ blankline <> nowrap labelText <> (if isTight then cr else blankline) <> contents <> blankline else do return $ nowrap labelText <> text " " <> cr <> vsep (map vsep defs') <> blankline -- | Convert list of Pandoc block elements to markdown. blockListToMarkdown :: PandocMonad m => WriterOptions -- ^ Options -> [Block] -- ^ List of block elements -> MD m Doc blockListToMarkdown opts blocks = do inlist <- asks envInList isPlain <- asks envPlain -- a) insert comment between list and indented code block, or the -- code block will be treated as a list continuation paragraph -- b) change Plain to Para unless it's followed by a RawBlock -- or has a list as its parent (#3487) let fixBlocks (b : CodeBlock attr x : rest) | (not (isEnabled Ext_fenced_code_blocks opts) || attr == nullAttr) && isListBlock b = b : commentSep : CodeBlock attr x : fixBlocks rest fixBlocks (b1@(BulletList _) : b2@(BulletList _) : bs) = b1 : commentSep : fixBlocks (b2:bs) fixBlocks (b1@(OrderedList _ _) : b2@(OrderedList _ _) : bs) = b1 : commentSep : fixBlocks (b2:bs) fixBlocks (b1@(DefinitionList _) : b2@(DefinitionList _) : bs) = b1 : commentSep : fixBlocks (b2:bs) fixBlocks (Plain ils : bs@(RawBlock{}:_)) = Plain ils : fixBlocks bs fixBlocks (Plain ils : bs) | inlist = Plain ils : fixBlocks bs fixBlocks (Plain ils : bs) = Para ils : fixBlocks bs fixBlocks (x : xs) = x : fixBlocks xs fixBlocks [] = [] isListBlock (BulletList _) = True isListBlock (OrderedList _ _) = True isListBlock (DefinitionList _) = True isListBlock _ = False commentSep = if isPlain then Null else if isEnabled Ext_raw_html opts then RawBlock "html" "<!-- -->\n" else RawBlock "markdown" " \n" mapM (blockToMarkdown opts) (fixBlocks blocks) >>= return . cat getKey :: Doc -> Key getKey = toKey . render Nothing -- | Get reference for target; if none exists, create unique one and return. -- Prefer label if possible; otherwise, generate a unique key. getReference :: PandocMonad m => Attr -> Doc -> Target -> MD m Doc getReference attr label target = do refs <- gets stRefs case find (\(_,t,a) -> t == target && a == attr) refs of Just (ref, _, _) -> return ref Nothing -> do keys <- gets stKeys case M.lookup (getKey label) keys of Nothing -> do -- no other refs with this label (lab', idx) <- if isEmpty label then do i <- (+ 1) <$> gets stLastIdx modify $ \s -> s{ stLastIdx = i } return (text (show i), i) else return (label, 0) modify (\s -> s{ stRefs = (lab', target, attr) : refs, stKeys = M.insert (getKey label) (M.insert (target, attr) idx mempty) (stKeys s) }) return lab' Just km -> do -- we have refs with this label case M.lookup (target, attr) km of Just i -> do let lab' = label <> if i == 0 then mempty else text (show i) -- make sure it's in stRefs; it may be -- a duplicate that was printed in a previous -- block: when ((lab', target, attr) `notElem` refs) $ modify (\s -> s{ stRefs = (lab', target, attr) : refs }) return lab' Nothing -> do -- but this one is to a new target i <- (+ 1) <$> gets stLastIdx modify $ \s -> s{ stLastIdx = i } let lab' = text (show i) modify (\s -> s{ stRefs = (lab', target, attr) : refs, stKeys = M.insert (getKey label) (M.insert (target, attr) i km) (stKeys s) }) return lab' -- | Convert list of Pandoc inline elements to markdown. inlineListToMarkdown :: PandocMonad m => WriterOptions -> [Inline] -> MD m Doc inlineListToMarkdown opts lst = do inlist <- asks envInList go (if inlist then avoidBadWrapsInList lst else lst) where go [] = return empty go (i:is) = case i of (Link _ _ _) -> case is of -- If a link is followed by another link, or '[', '(' or ':' -- then we don't shortcut (Link _ _ _):_ -> unshortcutable Space:(Link _ _ _):_ -> unshortcutable Space:(Str('[':_)):_ -> unshortcutable Space:(RawInline _ ('[':_)):_ -> unshortcutable Space:(Cite _ _):_ -> unshortcutable SoftBreak:(Link _ _ _):_ -> unshortcutable SoftBreak:(Str('[':_)):_ -> unshortcutable SoftBreak:(RawInline _ ('[':_)):_ -> unshortcutable SoftBreak:(Cite _ _):_ -> unshortcutable LineBreak:(Link _ _ _):_ -> unshortcutable LineBreak:(Str('[':_)):_ -> unshortcutable LineBreak:(RawInline _ ('[':_)):_ -> unshortcutable LineBreak:(Cite _ _):_ -> unshortcutable (Cite _ _):_ -> unshortcutable Str ('[':_):_ -> unshortcutable Str ('(':_):_ -> unshortcutable Str (':':_):_ -> unshortcutable (RawInline _ ('[':_)):_ -> unshortcutable (RawInline _ ('(':_)):_ -> unshortcutable (RawInline _ (':':_)):_ -> unshortcutable (RawInline _ (' ':'[':_)):_ -> unshortcutable _ -> shortcutable _ -> shortcutable where shortcutable = liftM2 (<>) (inlineToMarkdown opts i) (go is) unshortcutable = do iMark <- local (\env -> env { envRefShortcutable = False }) (inlineToMarkdown opts i) fmap (iMark <>) (go is) isSp :: Inline -> Bool isSp Space = True isSp SoftBreak = True isSp _ = False avoidBadWrapsInList :: [Inline] -> [Inline] avoidBadWrapsInList [] = [] avoidBadWrapsInList (s:Str ('>':cs):xs) | isSp s = Str (' ':'>':cs) : avoidBadWrapsInList xs avoidBadWrapsInList (s:Str [c]:[]) | isSp s && c `elem` ['-','*','+'] = Str [' ', c] : [] avoidBadWrapsInList (s:Str [c]:Space:xs) | isSp s && c `elem` ['-','*','+'] = Str [' ', c] : Space : avoidBadWrapsInList xs avoidBadWrapsInList (s:Str cs:Space:xs) | isSp s && isOrderedListMarker cs = Str (' ':cs) : Space : avoidBadWrapsInList xs avoidBadWrapsInList (s:Str cs:[]) | isSp s && isOrderedListMarker cs = Str (' ':cs) : [] avoidBadWrapsInList (x:xs) = x : avoidBadWrapsInList xs isOrderedListMarker :: String -> Bool isOrderedListMarker xs = not (null xs) && (last xs `elem` ['.',')']) && isRight (runParser (anyOrderedListMarker >> eof) defaultParserState "" xs) isRight :: Either a b -> Bool isRight (Right _) = True isRight (Left _) = False -- | Convert Pandoc inline element to markdown. inlineToMarkdown :: PandocMonad m => WriterOptions -> Inline -> MD m Doc inlineToMarkdown opts (Span ("",["emoji"],kvs) [Str s]) = do case lookup "data-emoji" kvs of Just emojiname | isEnabled Ext_emoji opts -> return $ ":" <> text emojiname <> ":" _ -> inlineToMarkdown opts (Str s) inlineToMarkdown opts (Span attrs ils) = do plain <- asks envPlain contents <- inlineListToMarkdown opts ils return $ case plain of True -> contents False | attrs == nullAttr -> contents | isEnabled Ext_bracketed_spans opts -> let attrs' = if attrs /= nullAttr then attrsToMarkdown attrs else empty in "[" <> contents <> "]" <> attrs' | isEnabled Ext_raw_html opts || isEnabled Ext_native_spans opts -> tagWithAttrs "span" attrs <> contents <> text "</span>" | otherwise -> contents inlineToMarkdown _ (Emph []) = return empty inlineToMarkdown opts (Emph lst) = do plain <- asks envPlain contents <- inlineListToMarkdown opts lst return $ if plain then "_" <> contents <> "_" else "*" <> contents <> "*" inlineToMarkdown _ (Strong []) = return empty inlineToMarkdown opts (Strong lst) = do plain <- asks envPlain if plain then inlineListToMarkdown opts $ capitalize lst else do contents <- inlineListToMarkdown opts lst return $ "**" <> contents <> "**" inlineToMarkdown _ (Strikeout []) = return empty inlineToMarkdown opts (Strikeout lst) = do contents <- inlineListToMarkdown opts lst return $ if isEnabled Ext_strikeout opts then "~~" <> contents <> "~~" else if isEnabled Ext_raw_html opts then "<s>" <> contents <> "</s>" else contents inlineToMarkdown _ (Superscript []) = return empty inlineToMarkdown opts (Superscript lst) = local (\env -> env {envEscapeSpaces = True}) $ do contents <- inlineListToMarkdown opts lst return $ if isEnabled Ext_superscript opts then "^" <> contents <> "^" else if isEnabled Ext_raw_html opts then "<sup>" <> contents <> "</sup>" else let rendered = render Nothing contents in case mapM toSuperscript rendered of Just r -> text r Nothing -> text $ "^(" ++ rendered ++ ")" inlineToMarkdown _ (Subscript []) = return empty inlineToMarkdown opts (Subscript lst) = local (\env -> env {envEscapeSpaces = True}) $ do contents <- inlineListToMarkdown opts lst return $ if isEnabled Ext_subscript opts then "~" <> contents <> "~" else if isEnabled Ext_raw_html opts then "<sub>" <> contents <> "</sub>" else let rendered = render Nothing contents in case mapM toSubscript rendered of Just r -> text r Nothing -> text $ "_(" ++ rendered ++ ")" inlineToMarkdown opts (SmallCaps lst) = do plain <- asks envPlain if not plain && (isEnabled Ext_raw_html opts || isEnabled Ext_native_spans opts) then inlineToMarkdown opts (Span ("",["smallcaps"],[]) lst) else inlineListToMarkdown opts $ capitalize lst inlineToMarkdown opts (Quoted SingleQuote lst) = do contents <- inlineListToMarkdown opts lst return $ if isEnabled Ext_smart opts then "'" <> contents <> "'" else "‘" <> contents <> "’" inlineToMarkdown opts (Quoted DoubleQuote lst) = do contents <- inlineListToMarkdown opts lst return $ if isEnabled Ext_smart opts then "\"" <> contents <> "\"" else "“" <> contents <> "”" inlineToMarkdown opts (Code attr str) = do let tickGroups = filter (\s -> '`' `elem` s) $ group str let longest = if null tickGroups then 0 else maximum $ map length tickGroups let marker = replicate (longest + 1) '`' let spacer = if (longest == 0) then "" else " " let attrs = if isEnabled Ext_inline_code_attributes opts && attr /= nullAttr then attrsToMarkdown attr else empty plain <- asks envPlain if plain then return $ text str else return $ text (marker ++ spacer ++ str ++ spacer ++ marker) <> attrs inlineToMarkdown opts (Str str) = do isPlain <- asks envPlain let str' = (if isEnabled Ext_smart opts then unsmartify opts else id) $ if isPlain then str else escapeString opts str return $ text str' inlineToMarkdown opts (Math InlineMath str) = case writerHTMLMathMethod opts of WebTeX url -> inlineToMarkdown opts (Image nullAttr [Str str] (url ++ urlEncode str, str)) _ | isEnabled Ext_tex_math_dollars opts -> return $ "$" <> text str <> "$" | isEnabled Ext_tex_math_single_backslash opts -> return $ "\\(" <> text str <> "\\)" | isEnabled Ext_tex_math_double_backslash opts -> return $ "\\\\(" <> text str <> "\\\\)" | otherwise -> do plain <- asks envPlain texMathToInlines InlineMath str >>= inlineListToMarkdown opts . (if plain then makeMathPlainer else id) inlineToMarkdown opts (Math DisplayMath str) = case writerHTMLMathMethod opts of WebTeX url -> (\x -> blankline <> x <> blankline) `fmap` inlineToMarkdown opts (Image nullAttr [Str str] (url ++ urlEncode str, str)) _ | isEnabled Ext_tex_math_dollars opts -> return $ "$$" <> text str <> "$$" | isEnabled Ext_tex_math_single_backslash opts -> return $ "\\[" <> text str <> "\\]" | isEnabled Ext_tex_math_double_backslash opts -> return $ "\\\\[" <> text str <> "\\\\]" | otherwise -> (\x -> cr <> x <> cr) `fmap` (texMathToInlines DisplayMath str >>= inlineListToMarkdown opts) inlineToMarkdown opts il@(RawInline f str) = do plain <- asks envPlain if (plain && f == "plain") || (not plain && ( f `elem` ["markdown", "markdown_github", "markdown_phpextra", "markdown_mmd", "markdown_strict"] || (isEnabled Ext_raw_tex opts && (f == "latex" || f == "tex")) || (isEnabled Ext_raw_html opts && f `elem` ["html", "html4", "html5"]) )) then return $ text str else do report $ InlineNotRendered il return empty inlineToMarkdown opts (LineBreak) = do plain <- asks envPlain if plain || isEnabled Ext_hard_line_breaks opts then return cr else return $ if isEnabled Ext_escaped_line_breaks opts then "\\" <> cr else " " <> cr inlineToMarkdown _ Space = do escapeSpaces <- asks envEscapeSpaces return $ if escapeSpaces then "\\ " else space inlineToMarkdown opts SoftBreak = do escapeSpaces <- asks envEscapeSpaces let space' = if escapeSpaces then "\\ " else space return $ case writerWrapText opts of WrapNone -> space' WrapAuto -> space' WrapPreserve -> cr inlineToMarkdown opts (Cite [] lst) = inlineListToMarkdown opts lst inlineToMarkdown opts (Cite (c:cs) lst) | not (isEnabled Ext_citations opts) = inlineListToMarkdown opts lst | otherwise = if citationMode c == AuthorInText then do suffs <- inlineListToMarkdown opts $ citationSuffix c rest <- mapM convertOne cs let inbr = suffs <+> joincits rest br = if isEmpty inbr then empty else char '[' <> inbr <> char ']' return $ text ("@" ++ citationId c) <+> br else do cits <- mapM convertOne (c:cs) return $ text "[" <> joincits cits <> text "]" where joincits = hcat . intersperse (text "; ") . filter (not . isEmpty) convertOne Citation { citationId = k , citationPrefix = pinlines , citationSuffix = sinlines , citationMode = m } = do pdoc <- inlineListToMarkdown opts pinlines sdoc <- inlineListToMarkdown opts sinlines let k' = text (modekey m ++ "@" ++ k) r = case sinlines of Str (y:_):_ | y `elem` (",;]@" :: String) -> k' <> sdoc _ -> k' <+> sdoc return $ pdoc <+> r modekey SuppressAuthor = "-" modekey _ = "" inlineToMarkdown opts lnk@(Link attr txt (src, tit)) | isEnabled Ext_raw_html opts && not (isEnabled Ext_link_attributes opts) && attr /= nullAttr = -- use raw HTML (text . T.unpack . T.strip) <$> writeHtml5String opts{ writerTemplate = Nothing } (Pandoc nullMeta [Plain [lnk]]) | otherwise = do plain <- asks envPlain linktext <- inlineListToMarkdown opts txt let linktitle = if null tit then empty else text $ " \"" ++ tit ++ "\"" let srcSuffix = fromMaybe src (stripPrefix "mailto:" src) let useAuto = isURI src && case txt of [Str s] | escapeURI s == srcSuffix -> True _ -> False let useRefLinks = writerReferenceLinks opts && not useAuto shortcutable <- asks envRefShortcutable let useShortcutRefLinks = shortcutable && isEnabled Ext_shortcut_reference_links opts reftext <- if useRefLinks then getReference attr linktext (src, tit) else return empty return $ if useAuto then if plain then text srcSuffix else "<" <> text srcSuffix <> ">" else if useRefLinks then let first = "[" <> linktext <> "]" second = if getKey linktext == getKey reftext then if useShortcutRefLinks then "" else "[]" else "[" <> reftext <> "]" in first <> second else if plain then linktext else "[" <> linktext <> "](" <> text src <> linktitle <> ")" <> linkAttributes opts attr inlineToMarkdown opts img@(Image attr alternate (source, tit)) | isEnabled Ext_raw_html opts && not (isEnabled Ext_link_attributes opts) && attr /= nullAttr = -- use raw HTML (text . T.unpack . T.strip) <$> writeHtml5String opts{ writerTemplate = Nothing } (Pandoc nullMeta [Plain [img]]) | otherwise = do plain <- asks envPlain let txt = if null alternate || alternate == [Str source] -- to prevent autolinks then [Str ""] else alternate linkPart <- inlineToMarkdown opts (Link attr txt (source, tit)) return $ if plain then "[" <> linkPart <> "]" else "!" <> linkPart inlineToMarkdown opts (Note contents) = do modify (\st -> st{ stNotes = contents : stNotes st }) st <- get let ref = text $ writerIdentifierPrefix opts ++ show (stNoteNum st + (length $ stNotes st) - 1) if isEnabled Ext_footnotes opts then return $ "[^" <> ref <> "]" else return $ "[" <> ref <> "]" makeMathPlainer :: [Inline] -> [Inline] makeMathPlainer = walk go where go (Emph xs) = Span nullAttr xs go x = x toSuperscript :: Char -> Maybe Char toSuperscript '1' = Just '\x00B9' toSuperscript '2' = Just '\x00B2' toSuperscript '3' = Just '\x00B3' toSuperscript '+' = Just '\x207A' toSuperscript '-' = Just '\x207B' toSuperscript '=' = Just '\x207C' toSuperscript '(' = Just '\x207D' toSuperscript ')' = Just '\x207E' toSuperscript c | c >= '0' && c <= '9' = Just $ chr (0x2070 + (ord c - 48)) | isSpace c = Just c | otherwise = Nothing toSubscript :: Char -> Maybe Char toSubscript '+' = Just '\x208A' toSubscript '-' = Just '\x208B' toSubscript '=' = Just '\x208C' toSubscript '(' = Just '\x208D' toSubscript ')' = Just '\x208E' toSubscript c | c >= '0' && c <= '9' = Just $ chr (0x2080 + (ord c - 48)) | isSpace c = Just c | otherwise = Nothing lineBreakToSpace :: Inline -> Inline lineBreakToSpace LineBreak = Space lineBreakToSpace SoftBreak = Space lineBreakToSpace x = x