{-# LANGUAGE NoImplicitPrelude #-} {-# LANGUAGE CPP #-} {- Copyright (C) 2017-2018 Yuchen Pei <me@ypei.me> 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.Vimwiki Copyright : Copyright (C) 2017-2018 Yuchen Pei License : GNU GPL, version 2 or above Maintainer : Yuchen Pei <me@ypei.me> Stability : alpha Portability : portable Conversion of vimwiki text to 'Pandoc' document. -} {-- [X]: implemented [O]: not implemented * block parsers: * [X] header * [X] hrule * [X] comment * [X] blockquote * [X] preformatted -- using codeblock * [X] displaymath * [X] bulletlist / orderedlist * [X] todo lists -- using span. * [X] table * [X] centered table -- using div * [O] colspan and rowspan -- see issue #1024 * [X] paragraph * [X] definition list * inline parsers: * [X] bareURL * [X] strong * [X] emph * [X] strikeout * [X] code * [X] link * [X] image * [X] inline math * [X] tag * [X] sub- and super-scripts * misc: * [X] `TODO:` mark * [X] metadata placeholders: %title and %date * [O] control placeholders: %template and %nohtml -- ignored --} module Text.Pandoc.Readers.Vimwiki ( readVimwiki ) where import Prelude import Control.Monad (guard) import Control.Monad.Except (throwError) import Data.Default import Data.List (isInfixOf, isPrefixOf) import Data.Maybe import Data.Text (Text, unpack) import Text.Pandoc.Builder (Blocks, Inlines, fromList, toList, trimInlines) import qualified Text.Pandoc.Builder as B (blockQuote, bulletList, code, codeBlockWith, definitionList, displayMath, divWith, emph, headerWith, horizontalRule, image, imageWith, link, math, orderedList, para, plain, setMeta, simpleTable, softbreak, space, spanWith, str, strikeout, strong, subscript, superscript) import Text.Pandoc.Class (PandocMonad (..)) import Text.Pandoc.Definition (Attr, Block (BulletList, OrderedList), Inline (Space), ListNumberDelim (..), ListNumberStyle (..), Meta, Pandoc (..), nullMeta) import Text.Pandoc.Options (ReaderOptions) import Text.Pandoc.Parsing (F, ParserState, ParserT, blanklines, emailAddress, many1Till, orderedListMarker, readWithM, registerHeader, runF, spaceChar, stateMeta', stateOptions, uri) import Text.Pandoc.Shared (crFilter, splitBy, stringify, stripFirstAndLast) import Text.Parsec.Char (alphaNum, anyChar, char, newline, noneOf, oneOf, space, spaces, string) import Text.Parsec.Combinator (between, choice, count, eof, lookAhead, many1, manyTill, notFollowedBy, option, skipMany1) import Text.Parsec.Prim (getState, many, try, updateState, (<|>)) readVimwiki :: PandocMonad m => ReaderOptions -> Text -> m Pandoc readVimwiki opts s = do res <- readWithM parseVimwiki def{ stateOptions = opts } (unpack (crFilter s)) case res of Left e -> throwError e Right result -> return result type VwParser = ParserT [Char] ParserState -- constants specialChars :: [Char] specialChars = "=*-#[]_~{}`$|:%^," spaceChars :: [Char] spaceChars = " \t\n" -- main parser parseVimwiki :: PandocMonad m => VwParser m Pandoc parseVimwiki = do bs <- mconcat <$> many block spaces eof st <- getState let meta = runF (stateMeta' st) st return $ Pandoc meta (toList bs) -- block parser block :: PandocMonad m => VwParser m Blocks block = do res <- choice [ mempty <$ blanklines , header , hrule , mempty <$ comment , mixedList , preformatted , displayMath , table , mempty <$ placeholder , blockQuote , definitionList , para ] trace (take 60 $ show $ toList res) return res blockML :: PandocMonad m => VwParser m Blocks blockML = choice [preformatted, displayMath, table] header :: PandocMonad m => VwParser m Blocks header = try $ do sp <- many spaceChar eqs <- many1 (char '=') spaceChar let lev = length eqs guard $ lev <= 6 contents <- trimInlines . mconcat <$> manyTill inline (try $ spaceChar >> string eqs >> many spaceChar >> newline) attr <- registerHeader (makeId contents, if sp == "" then [] else ["justcenter"], []) contents return $ B.headerWith attr lev contents para :: PandocMonad m => VwParser m Blocks para = try $ do contents <- trimInlines . mconcat <$> many1 inline if all (==Space) (toList contents) then return mempty else return $ B.para contents hrule :: PandocMonad m => VwParser m Blocks hrule = try $ B.horizontalRule <$ (string "----" >> many (char '-') >> newline) comment :: PandocMonad m => VwParser m () comment = try $ do many spaceChar >> string "%%" >> many (noneOf "\n") return () blockQuote :: PandocMonad m => VwParser m Blocks blockQuote = try $ do string " " contents <- trimInlines . mconcat <$> many1 inlineBQ if all (==Space) (toList contents) then return mempty else return $ B.blockQuote $ B.plain contents definitionList :: PandocMonad m => VwParser m Blocks definitionList = try $ B.definitionList <$> many1 (dlItemWithDT <|> dlItemWithoutDT) dlItemWithDT :: PandocMonad m => VwParser m (Inlines, [Blocks]) dlItemWithDT = do dt <- definitionTerm dds <- many definitionDef return (dt, dds) dlItemWithoutDT :: PandocMonad m => VwParser m (Inlines, [Blocks]) dlItemWithoutDT = do dds <- many1 definitionDef return (mempty, dds) definitionDef :: PandocMonad m => VwParser m Blocks definitionDef = try $ notFollowedBy definitionTerm >> many spaceChar >> (definitionDef1 <|> definitionDef2) definitionDef1 :: PandocMonad m => VwParser m Blocks definitionDef1 = try $ mempty <$ defMarkerE definitionDef2 :: PandocMonad m => VwParser m Blocks definitionDef2 = try $ B.plain <$> (defMarkerM >> (trimInlines . mconcat <$> many inline') <* newline) definitionTerm :: PandocMonad m => VwParser m Inlines definitionTerm = try $ do x <- definitionTerm1 <|> definitionTerm2 guard (stringify x /= "") return x definitionTerm1 :: PandocMonad m => VwParser m Inlines definitionTerm1 = try $ trimInlines . mconcat <$> manyTill inline' (try defMarkerE) definitionTerm2 :: PandocMonad m => VwParser m Inlines definitionTerm2 = try $ trimInlines . mconcat <$> manyTill inline' (try $lookAhead (defMarkerM >> notFollowedBy hasDefMarkerM)) defMarkerM :: PandocMonad m => VwParser m Char defMarkerM = string "::" >> spaceChar defMarkerE :: PandocMonad m => VwParser m Char defMarkerE = string "::" >> newline hasDefMarkerM :: PandocMonad m => VwParser m String hasDefMarkerM = manyTill (noneOf "\n") (try defMarkerM) preformatted :: PandocMonad m => VwParser m Blocks preformatted = try $ do many spaceChar >> string "{{{" attrText <- many (noneOf "\n") lookAhead newline contents <- manyTill anyChar (try (char '\n' >> many spaceChar >> string "}}}" >> many spaceChar >> newline)) if (contents /= "") && (head contents == '\n') then return $ B.codeBlockWith (makeAttr attrText) (tail contents) else return $ B.codeBlockWith (makeAttr attrText) contents makeAttr :: String -> Attr makeAttr s = let xs = splitBy (`elem` " \t") s in ("", [], mapMaybe nameValue xs) nameValue :: String -> Maybe (String, String) nameValue s = let t = splitBy (== '=') s in if length t /= 2 then Nothing else let (a, b) = (head t, last t) in if (length b < 2) || ((head b, last b) /= ('"', '"')) then Nothing else Just (a, stripFirstAndLast b) displayMath :: PandocMonad m => VwParser m Blocks displayMath = try $ do many spaceChar >> string "{{$" mathTag <- option "" mathTagParser many space contents <- manyTill anyChar (try (char '\n' >> many spaceChar >> string "}}$" >> many spaceChar >> newline)) let contentsWithTags | mathTag == "" = contents | otherwise = "\\begin{" ++ mathTag ++ "}\n" ++ contents ++ "\n\\end{" ++ mathTag ++ "}" return $ B.para $ B.displayMath contentsWithTags mathTagLaTeX :: String -> String mathTagLaTeX s = case s of "equation" -> "" "equation*" -> "" "gather" -> "gathered" "gather*" -> "gathered" "multline" -> "gathered" "multline*" -> "gathered" "eqnarray" -> "aligned" "eqnarray*" -> "aligned" "align" -> "aligned" "align*" -> "aligned" "alignat" -> "aligned" "alignat*" -> "aligned" _ -> s mixedList :: PandocMonad m => VwParser m Blocks mixedList = try $ do (bl, _) <- mixedList' (-1) return $ head bl mixedList' :: PandocMonad m => Int -> VwParser m ([Blocks], Int) mixedList' prevInd = do (curInd, builder) <- option (-1, "na") (lookAhead listStart) if curInd < prevInd then return ([], curInd) else do listStart curLine <- listItemContent let listBuilder = if builder == "ul" then B.bulletList else B.orderedList (subList, lowInd) <- mixedList' curInd if lowInd >= curInd then do (sameIndList, endInd) <- mixedList' lowInd let curList = combineList curLine subList ++ sameIndList if curInd > prevInd then return ([listBuilder curList], endInd) else return (curList, endInd) else do let (curList, endInd) = (combineList curLine subList, lowInd) if curInd > prevInd then return ([listBuilder curList], endInd) else return (curList, endInd) plainInlineML' :: PandocMonad m => Inlines -> VwParser m Blocks plainInlineML' w = do xs <- many inlineML newline return $ B.plain $ trimInlines $ mconcat $ w:xs plainInlineML :: PandocMonad m => VwParser m Blocks plainInlineML = notFollowedBy listStart >> spaceChar >> plainInlineML' mempty listItemContent :: PandocMonad m => VwParser m Blocks listItemContent = try $ do w <- option mempty listTodoMarker x <- plainInlineML' w y <- many blocksThenInline z <- many blockML return $ mconcat $ x:y ++ z blocksThenInline :: PandocMonad m => VwParser m Blocks blocksThenInline = try $ do y <- many1 blockML x <- plainInlineML return $ mconcat $ y ++ [x] listTodoMarker :: PandocMonad m => VwParser m Inlines listTodoMarker = try $ do x <- between (many spaceChar >> char '[') (char ']' >> spaceChar) (oneOf " .oOX") return $ makeListMarkerSpan x makeListMarkerSpan :: Char -> Inlines makeListMarkerSpan x = let cl = case x of ' ' -> "done0" '.' -> "done1" 'o' -> "done2" 'O' -> "done3" 'X' -> "done4" _ -> "" in B.spanWith ("", [cl], []) mempty combineList :: Blocks -> [Blocks] -> [Blocks] combineList x [y] = case toList y of [BulletList z] -> [fromList $ toList x ++ [BulletList z]] [OrderedList attr z] -> [fromList $ toList x ++ [OrderedList attr z]] _ -> x:[y] combineList x xs = x:xs listStart :: PandocMonad m => VwParser m (Int, String) listStart = try $ do s <- many spaceChar listType <- bulletListMarkers <|> orderedListMarkers spaceChar return (length s, listType) bulletListMarkers :: PandocMonad m => VwParser m String bulletListMarkers = "ul" <$ (char '*' <|> char '-') orderedListMarkers :: PandocMonad m => VwParser m String orderedListMarkers = ("ol" <$choice (orderedListMarker Decimal Period:(($OneParen) . orderedListMarker <$> [Decimal, LowerRoman, UpperRoman, LowerAlpha, UpperAlpha]))) <|> ("ol" <$ char '#') --many need trimInlines table :: PandocMonad m => VwParser m Blocks table = try $ do indent <- lookAhead (many spaceChar) (th, trs) <- table1 <|> table2 let tab = B.simpleTable th trs if indent == "" then return tab else return $ B.divWith ("", ["center"], []) tab -- table with header table1 :: PandocMonad m => VwParser m ([Blocks], [[Blocks]]) table1 = try $ do th <- tableRow many1 tableHeaderSeparator trs <- many tableRow return (th, trs) -- headerless table table2 :: PandocMonad m => VwParser m ([Blocks], [[Blocks]]) table2 = try $ do trs <- many1 tableRow return (replicate (length $ head trs) mempty, trs) tableHeaderSeparator :: PandocMonad m => VwParser m () tableHeaderSeparator = try $ do many spaceChar >> char '|' >> many1 (many1 (char '-') >> char '|') >> many spaceChar >> newline return () tableRow :: PandocMonad m => VwParser m [Blocks] tableRow = try $ do many spaceChar >> char '|' s <- lookAhead $ manyTill anyChar (try (char '|' >> many spaceChar >> newline)) guard $ not $ "||" `isInfixOf` ("|" ++ s ++ "|") tr <- many tableCell many spaceChar >> char '\n' return tr tableCell :: PandocMonad m => VwParser m Blocks tableCell = try $ B.plain . trimInlines . mconcat <$> manyTill inline' (char '|') placeholder :: PandocMonad m => VwParser m () placeholder = try $ choice (ph <$> ["title", "date"]) <|> noHtmlPh <|> templatePh ph :: PandocMonad m => String -> VwParser m () ph s = try $ do many spaceChar >>string ('%':s) >> spaceChar contents <- trimInlines . mconcat <$> manyTill inline (lookAhead newline) --use lookAhead because of placeholder in the whitespace parser let meta' = return $ B.setMeta s contents nullMeta :: F Meta updateState $ \st -> st { stateMeta' = stateMeta' st <> meta' } noHtmlPh :: PandocMonad m => VwParser m () noHtmlPh = try $ () <$ (many spaceChar >> string "%nohtml" >> many spaceChar >> lookAhead newline) templatePh :: PandocMonad m => VwParser m () templatePh = try $ () <$ (many spaceChar >> string "%template" >>many (noneOf "\n") >> lookAhead newline) -- inline parser inline :: PandocMonad m => VwParser m Inlines inline = choice $ whitespace endlineP:inlineList inlineList :: PandocMonad m => [VwParser m Inlines] inlineList = [ bareURL , todoMark , str , strong , emph , strikeout , code , link , image , inlineMath , tag , superscript , subscript , special ] -- inline parser without softbreaks or comment breaks inline' :: PandocMonad m => VwParser m Inlines inline' = choice $ whitespace':inlineList -- inline parser for blockquotes inlineBQ :: PandocMonad m => VwParser m Inlines inlineBQ = choice $ whitespace endlineBQ:inlineList -- inline parser for mixedlists inlineML :: PandocMonad m => VwParser m Inlines inlineML = choice $ whitespace endlineML:inlineList str :: PandocMonad m => VwParser m Inlines str = B.str <$>many1 (noneOf $ spaceChars ++ specialChars) whitespace :: PandocMonad m => VwParser m () -> VwParser m Inlines whitespace endline = B.space <$ (skipMany1 spaceChar <|> try (newline >> (comment <|> placeholder))) <|> B.softbreak <$ endline whitespace' :: PandocMonad m => VwParser m Inlines whitespace' = B.space <$ skipMany1 spaceChar special :: PandocMonad m => VwParser m Inlines special = B.str <$> count 1 (oneOf specialChars) bareURL :: PandocMonad m => VwParser m Inlines bareURL = try $ do (orig, src) <- uri <|> emailAddress return $ B.link src "" (B.str orig) strong :: PandocMonad m => VwParser m Inlines strong = try $ do s <- lookAhead $ between (char '*') (char '*') (many1 $ noneOf "*") guard $ (head s `notElem` spaceChars) && (last s `notElem` spaceChars) char '*' contents <- mconcat <$>manyTill inline' (char '*' >> notFollowedBy alphaNum) return $ B.spanWith (makeId contents, [], []) mempty <> B.strong contents makeId :: Inlines -> String makeId i = concat (stringify <$> toList i) emph :: PandocMonad m => VwParser m Inlines emph = try $ do s <- lookAhead $ between (char '_') (char '_') (many1 $ noneOf "_") guard $ (head s `notElem` spaceChars) && (last s `notElem` spaceChars) char '_' contents <- mconcat <$>manyTill inline' (char '_' >> notFollowedBy alphaNum) return $ B.emph contents strikeout :: PandocMonad m => VwParser m Inlines strikeout = try $ do string "~~" contents <- mconcat <$>many1Till inline' (string "~~") return $ B.strikeout contents code :: PandocMonad m => VwParser m Inlines code = try $ do char '`' contents <- many1Till (noneOf "\n") (char '`') return $ B.code contents superscript :: PandocMonad m => VwParser m Inlines superscript = try $ B.superscript . mconcat <$> (char '^' >> many1Till inline' (char '^')) subscript :: PandocMonad m => VwParser m Inlines subscript = try $ B.subscript . mconcat <$> (string ",," >> many1Till inline' (try $ string ",,")) link :: PandocMonad m => VwParser m Inlines link = try $ do string "[[" contents <- lookAhead $ manyTill anyChar (string "]]") case '|' `elem` contents of False -> do manyTill anyChar (string "]]") -- not using try here because [[hell]o]] is not rendered as a link in vimwiki return $ B.link (procLink contents) "" (B.str contents) True -> do url <- manyTill anyChar $ char '|' lab <- mconcat <$> manyTill inline (string "]]") return $ B.link (procLink url) "" lab image :: PandocMonad m => VwParser m Inlines image = try $ do string "{{" contentText <- lookAhead $ manyTill (noneOf "\n") (try $ string "}}") images $ length $ filter (== '|') contentText images :: PandocMonad m => Int -> VwParser m Inlines images k | k == 0 = do imgurl <- manyTill anyChar (try $ string "}}") return $ B.image (procImgurl imgurl) "" (B.str "") | k == 1 = do imgurl <- manyTill anyChar (char '|') alt <- mconcat <$> manyTill inline (try $ string "}}") return $ B.image (procImgurl imgurl) "" alt | k == 2 = do imgurl <- manyTill anyChar (char '|') alt <- mconcat <$>manyTill inline (char '|') attrText <- manyTill anyChar (try $ string "}}") return $ B.imageWith (makeAttr attrText) (procImgurl imgurl) "" alt | otherwise = do imgurl <- manyTill anyChar (char '|') alt <- mconcat <$>manyTill inline (char '|') attrText <- manyTill anyChar (char '|') manyTill anyChar (try $ string "}}") return $ B.imageWith (makeAttr attrText) (procImgurl imgurl) "" alt procLink' :: String -> String procLink' s | take 6 s == "local:" = "file" ++ drop 5 s | take 6 s == "diary:" = "diary/" ++ drop 6 s ++ ".html" | or ((`isPrefixOf` s) <$> [ "http:", "https:", "ftp:", "file:", "mailto:", "news:", "telnet:" ]) = s | s == "" = "" | last s == '/' = s | otherwise = s ++ ".html" procLink :: String -> String procLink s = procLink' x ++ y where (x, y) = break (=='#') s procImgurl :: String -> String procImgurl s = if take 6 s == "local:" then "file" ++ drop 5 s else s inlineMath :: PandocMonad m => VwParser m Inlines inlineMath = try $ do char '$' contents <- many1Till (noneOf "\n") (char '$') return $ B.math contents tag :: PandocMonad m => VwParser m Inlines tag = try $ do char ':' s <- manyTill (noneOf spaceChars) (try (char ':' >> lookAhead space)) guard $ not $ "::" `isInfixOf` (":" ++ s ++ ":") let ss = splitBy (==':') s return $ mconcat $ makeTagSpan' (head ss):(makeTagSpan <$> tail ss) todoMark :: PandocMonad m => VwParser m Inlines todoMark = try $ do string "TODO:" return $ B.spanWith ("", ["todo"], []) (B.str "TODO:") -- helper functions and parsers endlineP :: PandocMonad m => VwParser m () endlineP = () <$ try (newline <* nFBTTBSB <* notFollowedBy blockQuote) endlineBQ :: PandocMonad m => VwParser m () endlineBQ = () <$ try (newline <* nFBTTBSB <* string " ") endlineML :: PandocMonad m => VwParser m () endlineML = () <$ try (newline <* nFBTTBSB <* many1 spaceChar) --- nFBTTBSB is short for notFollowedByThingsThatBreakSoftBreaks nFBTTBSB :: PandocMonad m => VwParser m () nFBTTBSB = notFollowedBy newline <* notFollowedBy hrule <* notFollowedBy tableRow <* notFollowedBy header <* notFollowedBy listStart <* notFollowedBy preformatted <* notFollowedBy displayMath <* notFollowedBy hasDefMarker hasDefMarker :: PandocMonad m => VwParser m () hasDefMarker = () <$ manyTill (noneOf "\n") (string "::" >> oneOf spaceChars) makeTagSpan' :: String -> Inlines makeTagSpan' s = B.spanWith ('-' : s, [], []) (B.str "") <> B.spanWith (s, ["tag"], []) (B.str s) makeTagSpan :: String -> Inlines makeTagSpan s = B.space <> makeTagSpan' s mathTagParser :: PandocMonad m => VwParser m String mathTagParser = do s <- try $ lookAhead (char '%' >> manyTill (noneOf spaceChars) (try $ char '%' >> many (noneOf $ '%':spaceChars) >> space)) char '%' >> string s >> char '%' return $ mathTagLaTeX s