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|
{-# LANGUAGE NoImplicitPrelude #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE TupleSections #-}
{-
Copyright (C) 2017-2018 Alexander Krotov <ilabdsf@gmail.com>
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.Muse
Copyright : Copyright (C) 2017-2018 Alexander Krotov
License : GNU GPL, version 2 or above
Maintainer : Alexander Krotov <ilabdsf@gmail.com>
Stability : alpha
Portability : portable
Conversion of Muse text to 'Pandoc' document.
-}
{-
TODO:
- Page breaks (five "*")
- Org tables
- table.el tables
- <cite> tag
-}
module Text.Pandoc.Readers.Muse (readMuse) where
import Prelude
import Control.Monad
import Control.Monad.Reader
import Control.Monad.Except (throwError)
import Data.Bifunctor
import Data.Char (isAlphaNum)
import Data.Default
import Data.List (intercalate)
import Data.List.Split (splitOn)
import qualified Data.Map as M
import qualified Data.Set as Set
import Data.Maybe (fromMaybe, isNothing, maybeToList)
import Data.Text (Text, unpack)
import Text.Pandoc.Builder (Blocks, Inlines)
import qualified Text.Pandoc.Builder as B
import Text.Pandoc.Class (PandocMonad (..))
import Text.Pandoc.Definition
import Text.Pandoc.Error (PandocError (PandocParsecError))
import Text.Pandoc.Logging
import Text.Pandoc.Options
import Text.Pandoc.Parsing hiding (F, enclosed)
import Text.Pandoc.Shared (crFilter, underlineSpan, mapLeft)
-- | Read Muse from an input string and return a Pandoc document.
readMuse :: PandocMonad m
=> ReaderOptions
-> Text
-> m Pandoc
readMuse opts s = do
let input = crFilter s
res <- mapLeft (PandocParsecError $ unpack input) `liftM` runReaderT (runParserT parseMuse def{ museOptions = opts } "source" input) def
case res of
Left e -> throwError e
Right d -> return d
type F = Future MuseState
data MuseState = MuseState { museMeta :: F Meta -- ^ Document metadata
, museOptions :: ReaderOptions
, museHeaders :: M.Map Inlines String -- ^ List of headers and ids (used for implicit ref links)
, museIdentifierList :: Set.Set String
, museLastStrPos :: Maybe SourcePos -- ^ Position after last str parsed
, museLogMessages :: [LogMessage]
, museNotes :: M.Map String (SourcePos, F Blocks)
, museInPara :: Bool -- ^ True when looking for a paragraph terminator
}
instance Default MuseState where
def = MuseState { museMeta = return nullMeta
, museOptions = def
, museHeaders = M.empty
, museIdentifierList = Set.empty
, museLastStrPos = Nothing
, museLogMessages = []
, museNotes = M.empty
, museInPara = False
}
data MuseEnv =
MuseEnv { museInLink :: Bool -- ^ True when parsing a link description to avoid nested links
}
instance Default MuseEnv where
def = MuseEnv { museInLink = False }
type MuseParser m = ParserT Text MuseState (ReaderT MuseEnv m)
instance HasReaderOptions MuseState where
extractReaderOptions = museOptions
instance HasHeaderMap MuseState where
extractHeaderMap = museHeaders
updateHeaderMap f st = st{ museHeaders = f $ museHeaders st }
instance HasIdentifierList MuseState where
extractIdentifierList = museIdentifierList
updateIdentifierList f st = st{ museIdentifierList = f $ museIdentifierList st }
instance HasLastStrPosition MuseState where
setLastStrPos pos st = st{ museLastStrPos = Just pos }
getLastStrPos st = museLastStrPos st
instance HasLogMessages MuseState where
addLogMessage m s = s{ museLogMessages = m : museLogMessages s }
getLogMessages = reverse . museLogMessages
-- | Parse Muse document
parseMuse :: PandocMonad m => MuseParser m Pandoc
parseMuse = do
many directive
blocks <- (:) <$> parseBlocks <*> many parseSection
st <- getState
let doc = runF (Pandoc <$> museMeta st <*> fmap B.toList (mconcat blocks)) st
reportLogMessages
return doc
-- * Utility functions
commonPrefix :: String -> String -> String
commonPrefix _ [] = []
commonPrefix [] _ = []
commonPrefix (x:xs) (y:ys)
| x == y = x : commonPrefix xs ys
| otherwise = []
-- | Trim up to one newline from the beginning of the string.
lchop :: String -> String
lchop ('\n':xs) = xs
lchop s = s
-- | Trim up to one newline from the end of the string.
rchop :: String -> String
rchop = reverse . lchop . reverse
dropSpacePrefix :: [String] -> [String]
dropSpacePrefix lns =
map (drop maxIndent) lns
where flns = filter (not . all (== ' ')) lns
maxIndent = if null flns then maximum (map length lns) else length $ takeWhile (== ' ') $ foldl1 commonPrefix flns
atStart :: PandocMonad m => MuseParser m a -> MuseParser m a
atStart p = do
pos <- getPosition
st <- getState
guard $ museLastStrPos st /= Just pos
p
firstColumn :: PandocMonad m => MuseParser m ()
firstColumn = getPosition >>= \pos -> guard (sourceColumn pos == 1)
-- * Parsers
-- | Parse end-of-line, which can be either a newline or end-of-file.
eol :: Stream s m Char => ParserT s st m ()
eol = void newline <|> eof
getIndent :: PandocMonad m
=> MuseParser m Int
getIndent = subtract 1 . sourceColumn <$ many spaceChar <*> getPosition
someUntil :: (Stream s m t)
=> ParserT s u m a
-> ParserT s u m b
-> ParserT s u m ([a], b)
someUntil p end = first <$> ((:) <$> p) <*> manyUntil p end
-- ** HTML parsers
openTag :: PandocMonad m => String -> MuseParser m [(String, String)]
openTag tag = try $
char '<' *> string tag *> manyTill attr (char '>')
where
attr = try $ (,)
<$ many1 spaceChar
<*> many1 (noneOf "=\n")
<* string "=\""
<*> manyTill (noneOf "\"") (char '"')
closeTag :: PandocMonad m => String -> MuseParser m ()
closeTag tag = try $ string "</" *> string tag *> void (char '>')
-- | Convert HTML attributes to Pandoc 'Attr'
htmlAttrToPandoc :: [(String, String)] -> Attr
htmlAttrToPandoc attrs = (ident, classes, keyvals)
where
ident = fromMaybe "" $ lookup "id" attrs
classes = maybe [] words $ lookup "class" attrs
keyvals = [(k,v) | (k,v) <- attrs, k /= "id" && k /= "class"]
parseHtmlContent :: PandocMonad m
=> String -- ^ Tag name
-> MuseParser m (Attr, F Blocks)
parseHtmlContent tag = try $ getIndent >>= \indent -> (,)
<$> fmap htmlAttrToPandoc (openTag tag)
<* manyTill spaceChar eol
<*> parseBlocksTill (try $ count indent spaceChar *> closeTag tag)
<* manyTill spaceChar eol -- closing tag must be followed by optional whitespace and newline
-- ** Directive parsers
-- While not documented, Emacs Muse allows "-" in directive name
parseDirectiveKey :: PandocMonad m => MuseParser m String
parseDirectiveKey = char '#' *> many (letter <|> char '-')
parseEmacsDirective :: PandocMonad m => MuseParser m (String, F Inlines)
parseEmacsDirective = (,)
<$> parseDirectiveKey
<* spaceChar
<*> (trimInlinesF . mconcat <$> manyTill inline' eol)
parseAmuseDirective :: PandocMonad m => MuseParser m (String, F Inlines)
parseAmuseDirective = (,)
<$> parseDirectiveKey
<* many1 spaceChar
<*> (trimInlinesF . mconcat <$> many1Till inline endOfDirective)
<* many blankline
where
endOfDirective = lookAhead $ eof <|> try (newline *> (void blankline <|> void parseDirectiveKey))
directive :: PandocMonad m => MuseParser m ()
directive = do
ext <- getOption readerExtensions
(key, value) <- if extensionEnabled Ext_amuse ext then parseAmuseDirective else parseEmacsDirective
updateState $ \st -> st { museMeta = B.setMeta (translateKey key) <$> value <*> museMeta st }
where translateKey "cover" = "cover-image"
translateKey x = x
-- ** Block parsers
-- | Parse section contents until EOF or next header
parseBlocks :: PandocMonad m
=> MuseParser m (F Blocks)
parseBlocks =
try (parseEnd <|>
nextSection <|>
blockStart <|>
listStart <|>
paraStart)
where
nextSection = mempty <$ lookAhead headingStart
parseEnd = mempty <$ eof
blockStart = (B.<>) <$> (blockElements <|> emacsNoteBlock)
<*> parseBlocks
listStart = do
updateState (\st -> st { museInPara = False })
uncurry (B.<>) <$> (anyListUntil parseBlocks <|> amuseNoteBlockUntil parseBlocks)
paraStart = do
indent <- length <$> many spaceChar
uncurry (B.<>) . first (p indent) <$> paraUntil parseBlocks
where p indent = if indent >= 2 && indent < 6 then fmap B.blockQuote else id
-- | Parse section that starts with a header
parseSection :: PandocMonad m
=> MuseParser m (F Blocks)
parseSection =
((B.<>) <$> emacsHeading <*> parseBlocks) <|>
(uncurry (B.<>) <$> amuseHeadingUntil parseBlocks)
parseBlocksTill :: PandocMonad m
=> MuseParser m a
-> MuseParser m (F Blocks)
parseBlocksTill end =
try (parseEnd <|>
blockStart <|>
listStart <|>
paraStart)
where
parseEnd = mempty <$ end
blockStart = (B.<>) <$> blockElements <*> continuation
listStart = do
updateState (\st -> st { museInPara = False })
uncurry (B.<>) <$> anyListUntil (parseEnd <|> continuation)
paraStart = uncurry (B.<>) <$> paraUntil (parseEnd <|> continuation)
continuation = parseBlocksTill end
listItemContentsUntil :: PandocMonad m
=> Int
-> MuseParser m a
-> MuseParser m a
-> MuseParser m (F Blocks, a)
listItemContentsUntil col pre end =
try blockStart <|>
try listStart <|>
try paraStart
where
parsePre = (mempty,) <$> pre
parseEnd = (mempty,) <$> end
paraStart = do
(f, (r, e)) <- paraUntil (parsePre <|> continuation <|> parseEnd)
return (f B.<> r, e)
blockStart = first <$> ((B.<>) <$> blockElements)
<*> (parsePre <|> continuation <|> parseEnd)
listStart = do
updateState (\st -> st { museInPara = False })
(f, (r, e)) <- anyListUntil (parsePre <|> continuation <|> parseEnd)
return (f B.<> r, e)
continuation = try $ do blank <- optionMaybe blankline
skipMany blankline
indentWith col
updateState (\st -> st { museInPara = museInPara st && isNothing blank })
listItemContentsUntil col pre end
parseBlock :: PandocMonad m => MuseParser m (F Blocks)
parseBlock = do
res <- blockElements <|> para
trace (take 60 $ show $ B.toList $ runF res def)
return res
where para = fst <$> paraUntil (try (eof <|> void (lookAhead blockElements)))
blockElements :: PandocMonad m => MuseParser m (F Blocks)
blockElements = do
updateState (\st -> st { museInPara = False })
choice [ mempty <$ blankline
, comment
, separator
, example
, exampleTag
, literalTag
, centerTag
, rightTag
, quoteTag
, divTag
, biblioTag
, playTag
, verseTag
, lineBlock
, table
, commentTag
]
-- | Parse a line comment, starting with @;@ in the first column.
comment :: PandocMonad m => MuseParser m (F Blocks)
comment = try $ mempty
<$ firstColumn
<* char ';'
<* optional (spaceChar *> many (noneOf "\n"))
<* eol
-- | Parse a horizontal rule, consisting of 4 or more @\'-\'@ characters.
separator :: PandocMonad m => MuseParser m (F Blocks)
separator = try $ pure B.horizontalRule
<$ string "----"
<* many (char '-')
<* many spaceChar
<* eol
headingStart :: PandocMonad m => MuseParser m (String, Int)
headingStart = try $ (,)
<$> option "" (try (parseAnchor <* manyTill spaceChar eol))
<* firstColumn
<*> fmap length (many1 $ char '*')
<* spaceChar
-- | Parse a single-line heading.
emacsHeading :: PandocMonad m => MuseParser m (F Blocks)
emacsHeading = try $ do
guardDisabled Ext_amuse
(anchorId, level) <- headingStart
content <- trimInlinesF . mconcat <$> manyTill inline eol
attr <- registerHeader (anchorId, [], []) (runF content def)
return $ B.headerWith attr level <$> content
-- | Parse a multi-line heading.
-- It is a Text::Amuse extension, Emacs Muse does not allow heading to span multiple lines.
amuseHeadingUntil :: PandocMonad m
=> MuseParser m a -- ^ Terminator parser
-> MuseParser m (F Blocks, a)
amuseHeadingUntil end = try $ do
guardEnabled Ext_amuse
(anchorId, level) <- headingStart
(content, e) <- paraContentsUntil end
attr <- registerHeader (anchorId, [], []) (runF content def)
return (B.headerWith attr level <$> content, e)
-- | Parse an example between @{{{@ and @}}}@.
-- It is an Amusewiki extension influenced by Creole wiki, as described in @Text::Amuse@ documentation.
example :: PandocMonad m => MuseParser m (F Blocks)
example = try $ pure . B.codeBlock
<$ string "{{{"
<* optional blankline
<*> manyTill anyChar (try (optional blankline *> string "}}}"))
-- | Parse an @\<example>@ tag.
exampleTag :: PandocMonad m => MuseParser m (F Blocks)
exampleTag = try $ fmap pure $ B.codeBlockWith
<$ many spaceChar
<*> (htmlAttrToPandoc <$> openTag "example")
<*> (rchop . intercalate "\n" . dropSpacePrefix . splitOn "\n" . lchop <$> manyTill anyChar (closeTag "example"))
<* manyTill spaceChar eol
-- | Parse a @\<literal>@ tag as a raw block.
-- For 'RawInline' @\<literal>@ parser, see 'inlineLiteralTag'.
literalTag :: PandocMonad m => MuseParser m (F Blocks)
literalTag = try $ fmap pure $ B.rawBlock
<$ many spaceChar
<*> (fromMaybe "html" . lookup "style" <$> openTag "literal") -- FIXME: Emacs Muse inserts <literal> without style into all output formats, but we assume HTML
<* manyTill spaceChar eol
<*> (rchop . intercalate "\n" . dropSpacePrefix . splitOn "\n" . lchop <$> manyTill anyChar (closeTag "literal"))
<* manyTill spaceChar eol
-- | Parse @\<center>@ tag.
-- Currently it is ignored as Pandoc cannot represent centered blocks.
centerTag :: PandocMonad m => MuseParser m (F Blocks)
centerTag = snd <$> parseHtmlContent "center"
-- | Parse @\<right>@ tag.
-- Currently it is ignored as Pandoc cannot represent centered blocks.
rightTag :: PandocMonad m => MuseParser m (F Blocks)
rightTag = snd <$> parseHtmlContent "right"
-- | Parse @\<quote>@ tag.
quoteTag :: PandocMonad m => MuseParser m (F Blocks)
quoteTag = fmap B.blockQuote . snd <$> parseHtmlContent "quote"
-- | Parse @\<div>@ tag.
-- @\<div>@ tag is supported by Emacs Muse, but not Amusewiki 2.025.
divTag :: PandocMonad m => MuseParser m (F Blocks)
divTag = do
(attrs, content) <- parseHtmlContent "div"
return $ B.divWith attrs <$> content
-- | Parse @\<biblio>@ tag, the result is the same as @\<div class="biblio">@.
-- @\<biblio>@ tag is supported only in Text::Amuse mode.
biblioTag :: PandocMonad m => MuseParser m (F Blocks)
biblioTag = do
guardEnabled Ext_amuse
fmap (B.divWith ("", ["biblio"], [])) . snd <$> parseHtmlContent "biblio"
-- | Parse @\<play>@ tag, the result is the same as @\<div class="play">@.
-- @\<play>@ tag is supported only in Text::Amuse mode.
playTag :: PandocMonad m => MuseParser m (F Blocks)
playTag = do
guardEnabled Ext_amuse
fmap (B.divWith ("", ["play"], [])) . snd <$> parseHtmlContent "play"
verseLine :: PandocMonad m => MuseParser m (F Inlines)
verseLine = (<>)
<$> fmap pure (option mempty (B.str <$> many1 ('\160' <$ char ' ')))
<*> fmap (trimInlinesF . mconcat) (manyTill inline' eol)
-- | Parse @\<verse>@ tag.
verseTag :: PandocMonad m => MuseParser m (F Blocks)
verseTag = try $ getIndent >>= \indent -> fmap B.lineBlock . sequence
<$ openTag "verse"
<* manyTill spaceChar eol
<*> manyTill (count indent spaceChar *> verseLine) (try $ count indent spaceChar *> closeTag "verse")
<* manyTill spaceChar eol
-- | Parse @\<comment>@ tag.
commentTag :: PandocMonad m => MuseParser m (F Blocks)
commentTag = try $ mempty
<$ many spaceChar
<* openTag "comment"
<* manyTill anyChar (closeTag "comment")
<* manyTill spaceChar eol
-- | Parse paragraph contents.
paraContentsUntil :: PandocMonad m
=> MuseParser m a -- ^ Terminator parser
-> MuseParser m (F Inlines, a)
paraContentsUntil end = do
updateState (\st -> st { museInPara = True })
(l, e) <- someUntil inline $ try (manyTill spaceChar eol *> end)
updateState (\st -> st { museInPara = False })
return (trimInlinesF $ mconcat l, e)
-- | Parse a paragraph.
paraUntil :: PandocMonad m
=> MuseParser m a -- ^ Terminator parser
-> MuseParser m (F Blocks, a)
paraUntil end = do
state <- getState
guard $ not $ museInPara state
first (fmap B.para) <$> paraContentsUntil end
noteMarker :: PandocMonad m => MuseParser m String
noteMarker = try $ (:)
<$ char '['
<*> oneOf "123456789"
<*> manyTill digit (char ']')
-- Amusewiki version of note
-- Parsing is similar to list item, except that note marker is used instead of list marker
amuseNoteBlockUntil :: PandocMonad m
=> MuseParser m a
-> MuseParser m (F Blocks, a)
amuseNoteBlockUntil end = try $ do
guardEnabled Ext_amuse
ref <- noteMarker <* spaceChar
pos <- getPosition
updateState (\st -> st { museInPara = False })
(content, e) <- listItemContentsUntil (sourceColumn pos - 1) (fail "x") end
oldnotes <- museNotes <$> getState
when (M.member ref oldnotes)
(logMessage $ DuplicateNoteReference ref pos)
updateState $ \s -> s{ museNotes = M.insert ref (pos, content) oldnotes }
return (mempty, e)
-- Emacs version of note
-- Notes are allowed only at the end of text, no indentation is required.
emacsNoteBlock :: PandocMonad m => MuseParser m (F Blocks)
emacsNoteBlock = try $ do
guardDisabled Ext_amuse
pos <- getPosition
ref <- noteMarker <* skipSpaces
content <- mconcat <$> blocksTillNote
oldnotes <- museNotes <$> getState
when (M.member ref oldnotes)
(logMessage $ DuplicateNoteReference ref pos)
updateState $ \s -> s{ museNotes = M.insert ref (pos, content) oldnotes }
return mempty
where
blocksTillNote =
many1Till parseBlock (eof <|> () <$ lookAhead noteMarker)
--
-- Verse markup
--
-- | Parse a line block indicated by @\'>\'@ characters.
lineBlock :: PandocMonad m => MuseParser m (F Blocks)
lineBlock = try $ getIndent >>= \indent -> fmap B.lineBlock . sequence
<$> (blankVerseLine <|> nonblankVerseLine) `sepBy1'` try (indentWith indent)
where
blankVerseLine = try $ mempty <$ char '>' <* blankline
nonblankVerseLine = try (string "> ") *> verseLine
-- *** List parsers
bulletListItemsUntil :: PandocMonad m
=> Int -- ^ Indentation
-> MuseParser m a -- ^ Terminator parser
-> MuseParser m ([F Blocks], a)
bulletListItemsUntil indent end = try $ do
char '-'
void spaceChar <|> lookAhead eol
updateState (\st -> st { museInPara = False })
(x, (xs, e)) <- listItemContentsUntil (indent + 2) (try (optional blankline *> indentWith indent *> bulletListItemsUntil indent end)) (([],) <$> end)
return (x:xs, e)
-- | Parse a bullet list.
bulletListUntil :: PandocMonad m
=> MuseParser m a
-> MuseParser m (F Blocks, a)
bulletListUntil end = try $ do
indent <- getIndent
guard $ indent /= 0
first (fmap B.bulletList . sequence) <$> bulletListItemsUntil indent end
museOrderedListMarker :: PandocMonad m
=> ListNumberStyle
-> MuseParser m Int
museOrderedListMarker style =
snd <$> p <* char '.'
where p = case style of
Decimal -> decimal
UpperRoman -> upperRoman
LowerRoman -> lowerRoman
UpperAlpha -> upperAlpha
LowerAlpha -> lowerAlpha
_ -> fail "Unhandled case"
orderedListItemsUntil :: PandocMonad m
=> Int
-> ListNumberStyle
-> MuseParser m a
-> MuseParser m ([F Blocks], a)
orderedListItemsUntil indent style end =
continuation
where
continuation = try $ do
pos <- getPosition
void spaceChar <|> lookAhead eol
updateState (\st -> st { museInPara = False })
(x, (xs, e)) <- listItemContentsUntil (sourceColumn pos) (try (optional blankline *> indentWith indent *> museOrderedListMarker style *> continuation)) (([],) <$> end)
return (x:xs, e)
-- | Parse an ordered list.
orderedListUntil :: PandocMonad m
=> MuseParser m a
-> MuseParser m (F Blocks, a)
orderedListUntil end = try $ do
indent <- getIndent
guard $ indent /= 0
(style, start) <- decimal <|> lowerRoman <|> upperRoman <|> lowerAlpha <|> upperAlpha
char '.'
first (fmap (B.orderedListWith (start, style, Period)) . sequence)
<$> orderedListItemsUntil indent style end
descriptionsUntil :: PandocMonad m
=> Int
-> MuseParser m a
-> MuseParser m ([F Blocks], a)
descriptionsUntil indent end = do
void spaceChar <|> lookAhead eol
updateState (\st -> st { museInPara = False })
(x, (xs, e)) <- listItemContentsUntil indent (try (optional blankline *> indentWith indent *> manyTill spaceChar (string "::") *> descriptionsUntil indent end)) (([],) <$> end)
return (x:xs, e)
definitionListItemsUntil :: PandocMonad m
=> Int
-> MuseParser m a
-> MuseParser m ([F (Inlines, [Blocks])], a)
definitionListItemsUntil indent end =
continuation
where
continuation = try $ do
pos <- getPosition
term <- trimInlinesF . mconcat <$> manyTill inline' (try $ string "::")
(x, (xs, e)) <- descriptionsUntil (sourceColumn pos) (try (optional blankline *> indentWith indent *> continuation) <|> (([],) <$> end))
let xx = (,) <$> term <*> sequence x
return (xx:xs, e)
-- | Parse a definition list.
definitionListUntil :: PandocMonad m
=> MuseParser m a -- ^ Terminator parser
-> MuseParser m (F Blocks, a)
definitionListUntil end = try $ do
indent <- getIndent
guardDisabled Ext_amuse <|> guard (indent /= 0) -- Initial space is required by Amusewiki, but not Emacs Muse
first (fmap B.definitionList . sequence) <$> definitionListItemsUntil indent end
anyListUntil :: PandocMonad m
=> MuseParser m a -- ^ Terminator parser
-> MuseParser m (F Blocks, a)
anyListUntil end =
bulletListUntil end <|> orderedListUntil end <|> definitionListUntil end
-- *** Table parsers
-- | Internal Muse table representation.
data MuseTable = MuseTable
{ museTableCaption :: Inlines
, museTableHeaders :: [[Blocks]]
, museTableRows :: [[Blocks]]
, museTableFooters :: [[Blocks]]
}
data MuseTableElement = MuseHeaderRow [Blocks]
| MuseBodyRow [Blocks]
| MuseFooterRow [Blocks]
| MuseCaption Inlines
museToPandocTable :: MuseTable -> Blocks
museToPandocTable (MuseTable caption headers body footers) =
B.table caption attrs headRow rows
where ncol = maximum (0 : map length (headers ++ body ++ footers))
attrs = replicate ncol (AlignDefault, 0.0)
headRow = if null headers then [] else head headers
rows = (if null headers then [] else tail headers) ++ body ++ footers
museAppendElement :: MuseTableElement
-> MuseTable
-> MuseTable
museAppendElement element tbl =
case element of
MuseHeaderRow row -> tbl{ museTableHeaders = row : museTableHeaders tbl }
MuseBodyRow row -> tbl{ museTableRows = row : museTableRows tbl }
MuseFooterRow row -> tbl{ museTableFooters = row : museTableFooters tbl }
MuseCaption inlines -> tbl{ museTableCaption = inlines }
tableCell :: PandocMonad m => MuseParser m (F Blocks)
tableCell = try $ fmap B.plain . trimInlinesF . mconcat <$> manyTill inline (lookAhead cellEnd)
where cellEnd = try $ void (many1 spaceChar *> char '|') <|> eol
tableElements :: PandocMonad m => MuseParser m (F [MuseTableElement])
tableElements = sequence <$> (tableParseElement `sepEndBy1` eol)
elementsToTable :: [MuseTableElement] -> MuseTable
elementsToTable = foldr museAppendElement emptyTable
where emptyTable = MuseTable mempty mempty mempty mempty
-- | Parse a table.
table :: PandocMonad m => MuseParser m (F Blocks)
table = try $ fmap (museToPandocTable . elementsToTable) <$> tableElements
tableParseElement :: PandocMonad m => MuseParser m (F MuseTableElement)
tableParseElement = tableParseHeader
<|> tableParseBody
<|> tableParseFooter
<|> tableParseCaption
tableParseRow :: PandocMonad m
=> Int -- ^ Number of separator characters
-> MuseParser m (F [Blocks])
tableParseRow n = try $
sequence <$> (tableCell `sepBy2` fieldSep)
where p `sepBy2` sep = (:) <$> p <*> many1 (sep *> p)
fieldSep = many1 spaceChar *> count n (char '|') *> (void (many1 spaceChar) <|> void (lookAhead newline))
-- | Parse a table header row.
tableParseHeader :: PandocMonad m => MuseParser m (F MuseTableElement)
tableParseHeader = fmap MuseHeaderRow <$> tableParseRow 2
-- | Parse a table body row.
tableParseBody :: PandocMonad m => MuseParser m (F MuseTableElement)
tableParseBody = fmap MuseBodyRow <$> tableParseRow 1
-- | Parse a table footer row.
tableParseFooter :: PandocMonad m => MuseParser m (F MuseTableElement)
tableParseFooter = fmap MuseFooterRow <$> tableParseRow 3
-- | Parse table caption.
tableParseCaption :: PandocMonad m => MuseParser m (F MuseTableElement)
tableParseCaption = try $ fmap MuseCaption . trimInlinesF . mconcat
<$ many spaceChar
<* string "|+"
<*> many1Till inline (try $ string "+|")
-- ** Inline parsers
inline' :: PandocMonad m => MuseParser m (F Inlines)
inline' = whitespace
<|> br
<|> anchor
<|> footnote
<|> strong
<|> strongTag
<|> emph
<|> emphTag
<|> underlined
<|> superscriptTag
<|> subscriptTag
<|> strikeoutTag
<|> verbatimTag
<|> classTag
<|> nbsp
<|> linkOrImage
<|> code
<|> codeTag
<|> mathTag
<|> inlineLiteralTag
<|> str
<|> symbol
<?> "inline"
inline :: PandocMonad m => MuseParser m (F Inlines)
inline = endline <|> inline'
-- | Parse a soft break.
endline :: PandocMonad m => MuseParser m (F Inlines)
endline = try $ pure B.softbreak <$ newline <* notFollowedBy blankline
parseAnchor :: PandocMonad m => MuseParser m String
parseAnchor = try $ (:)
<$ firstColumn
<* char '#'
<*> letter
<*> many (letter <|> digit <|> char '-')
anchor :: PandocMonad m => MuseParser m (F Inlines)
anchor = try $ do
anchorId <- parseAnchor
skipMany spaceChar <|> void newline
return $ return $ B.spanWith (anchorId, [], []) mempty
-- | Parse a footnote reference.
footnote :: PandocMonad m => MuseParser m (F Inlines)
footnote = try $ do
inLink <- asks museInLink
guard $ not inLink
ref <- noteMarker
return $ do
notes <- asksF museNotes
case M.lookup ref notes of
Nothing -> return $ B.str $ "[" ++ ref ++ "]"
Just (_pos, contents) -> do
st <- askF
let contents' = runF contents st { museNotes = M.delete ref (museNotes st) }
return $ B.note contents'
whitespace :: PandocMonad m => MuseParser m (F Inlines)
whitespace = try $ pure B.space <$ skipMany1 spaceChar
-- | Parse @\<br>@ tag.
br :: PandocMonad m => MuseParser m (F Inlines)
br = try $ pure B.linebreak <$ string "<br>"
emphasisBetween :: (PandocMonad m, Show a) => MuseParser m a -> MuseParser m (F Inlines)
emphasisBetween c = try $ enclosedInlines c c
-- | Parses material enclosed between start and end parsers.
enclosed :: (Show end, Stream s m Char) => ParserT s st m t -- ^ start parser
-> ParserT s st m end -- ^ end parser
-> ParserT s st m a -- ^ content parser (to be used repeatedly)
-> ParserT s st m [a]
enclosed start end parser = try $
start *> notFollowedBy spaceChar *> many1Till parser end
enclosedInlines :: (PandocMonad m, Show a, Show b)
=> MuseParser m a
-> MuseParser m b
-> MuseParser m (F Inlines)
enclosedInlines start end = try $ trimInlinesF . mconcat
<$> enclosed (atStart start) end inline
<* notFollowedBy (satisfy isAlphaNum)
-- | Parse an inline tag, such as @\<em>@ and @\<strong>@.
inlineTag :: PandocMonad m
=> String -- ^ Tag name
-> MuseParser m (F Inlines)
inlineTag tag = try $ mconcat
<$ openTag tag
<*> manyTill inline (closeTag tag)
-- | Parse strong inline markup, indicated by @**@.
strong :: PandocMonad m => MuseParser m (F Inlines)
strong = fmap B.strong <$> emphasisBetween (string "**")
-- | Parse emphasis inline markup, indicated by @*@.
emph :: PandocMonad m => MuseParser m (F Inlines)
emph = fmap B.emph <$> emphasisBetween (char '*')
-- | Parse underline inline markup, indicated by @_@.
-- Supported only in Emacs Muse mode, not Text::Amuse.
underlined :: PandocMonad m => MuseParser m (F Inlines)
underlined = fmap underlineSpan
<$ guardDisabled Ext_amuse -- Supported only by Emacs Muse
<*> emphasisBetween (char '_')
-- | Parse @\<strong>@ tag.
strongTag :: PandocMonad m => MuseParser m (F Inlines)
strongTag = fmap B.strong <$> inlineTag "strong"
-- | Parse @\<em>@ tag.
emphTag :: PandocMonad m => MuseParser m (F Inlines)
emphTag = fmap B.emph <$> inlineTag "em"
-- | Parse @\<sup>@ tag.
superscriptTag :: PandocMonad m => MuseParser m (F Inlines)
superscriptTag = fmap B.superscript <$> inlineTag "sup"
-- | Parse @\<sub>@ tag.
subscriptTag :: PandocMonad m => MuseParser m (F Inlines)
subscriptTag = fmap B.subscript <$> inlineTag "sub"
-- | Parse @\<del>@ tag.
strikeoutTag :: PandocMonad m => MuseParser m (F Inlines)
strikeoutTag = fmap B.strikeout <$> inlineTag "del"
-- | Parse @\<verbatim>@ tag.
verbatimTag :: PandocMonad m => MuseParser m (F Inlines)
verbatimTag = return . B.text
<$ openTag "verbatim"
<*> manyTill anyChar (closeTag "verbatim")
-- | Parse @\<class>@ tag.
classTag :: PandocMonad m => MuseParser m (F Inlines)
classTag = do
classes <- maybe [] words . lookup "name" <$> openTag "class"
fmap (B.spanWith ("", classes, [])) . mconcat <$> manyTill inline (closeTag "class")
-- | Parse "~~" as nonbreaking space.
nbsp :: PandocMonad m => MuseParser m (F Inlines)
nbsp = try $ pure (B.str "\160") <$ string "~~"
-- | Parse code markup, indicated by @\'=\'@ characters.
code :: PandocMonad m => MuseParser m (F Inlines)
code = try $ do
atStart $ char '='
contents <- many1Till (noneOf "\n\r" <|> (newline <* notFollowedBy newline)) $ char '='
guard $ not $ null contents
guard $ head contents `notElem` " \t\n"
guard $ last contents `notElem` " \t\n"
notFollowedBy $ satisfy isAlphaNum
return $ return $ B.code contents
-- | Parse @\<code>@ tag.
codeTag :: PandocMonad m => MuseParser m (F Inlines)
codeTag = fmap pure $ B.codeWith
<$> (htmlAttrToPandoc <$> openTag "code")
<*> manyTill anyChar (closeTag "code")
-- | Parse @\<math>@ tag.
-- @\<math>@ tag is an Emacs Muse extension enabled by @(require 'muse-latex2png)@
mathTag :: PandocMonad m => MuseParser m (F Inlines)
mathTag = return . B.math
<$ openTag "math"
<*> manyTill anyChar (closeTag "math")
-- | Parse inline @\<literal>@ tag as a raw inline.
inlineLiteralTag :: PandocMonad m => MuseParser m (F Inlines)
inlineLiteralTag = try $ fmap pure $ B.rawInline
<$> (fromMaybe "html" . lookup "style" <$> openTag "literal") -- FIXME: Emacs Muse inserts <literal> without style into all output formats, but we assume HTML
<*> manyTill anyChar (closeTag "literal")
str :: PandocMonad m => MuseParser m (F Inlines)
str = return . B.str <$> many1 alphaNum <* updateLastStrPos
symbol :: PandocMonad m => MuseParser m (F Inlines)
symbol = return . B.str <$> count 1 nonspaceChar
-- | Parse a link or image.
linkOrImage :: PandocMonad m => MuseParser m (F Inlines)
linkOrImage = try $ do
inLink <- asks museInLink
guard $ not inLink
local (\s -> s { museInLink = True }) (explicitLink <|> image <|> link)
linkContent :: PandocMonad m => MuseParser m (F Inlines)
linkContent = trimInlinesF . mconcat
<$ char '['
<*> manyTill inline (char ']')
-- | Parse a link starting with @URL:@
explicitLink :: PandocMonad m => MuseParser m (F Inlines)
explicitLink = try $ do
string "[[URL:"
url <- manyTill anyChar $ char ']'
content <- option (pure $ B.str url) linkContent
char ']'
return $ B.link url "" <$> content
image :: PandocMonad m => MuseParser m (F Inlines)
image = try $ do
string "[["
(url, (ext, width, align)) <- manyUntil (noneOf "]") (imageExtensionAndOptions <* char ']')
content <- option mempty linkContent
char ']'
let widthAttr = case align of
Just 'f' -> [("width", fromMaybe "100" width ++ "%"), ("height", "75%")]
_ -> maybeToList (("width",) . (++ "%") <$> width)
let alignClass = case align of
Just 'r' -> ["align-right"]
Just 'l' -> ["align-left"]
Just 'f' -> []
_ -> []
return $ B.imageWith ("", alignClass, widthAttr) (url ++ ext) mempty <$> content
where -- Taken from muse-image-regexp defined in Emacs Muse file lisp/muse-regexps.el
imageExtensions = [".eps", ".gif", ".jpg", ".jpeg", ".pbm", ".png", ".tiff", ".xbm", ".xpm"]
imageExtension = choice (try . string <$> imageExtensions)
imageExtensionAndOptions = do
ext <- imageExtension
(width, align) <- option (Nothing, Nothing) imageAttrs
return (ext, width, align)
imageAttrs = (,)
<$ many1 spaceChar
<*> optionMaybe (many1 digit)
<* many spaceChar
<*> optionMaybe (oneOf "rlf")
link :: PandocMonad m => MuseParser m (F Inlines)
link = try $ do
string "[["
url <- manyTill anyChar $ char ']'
content <- optionMaybe linkContent
char ']'
return $ B.link url "" <$> fromMaybe (return $ B.str url) content
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