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+{-
+Copyright (C) 2014-2016 Albert Krewinkel <tarleb+pandoc@moltkeplatz.de>
+
+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.Org.Options
+ Copyright : Copyright (C) 2014-2016 Albert Krewinkel
+ License : GNU GPL, version 2 or above
+
+ Maintainer : Albert Krewinkel <tarleb+pandoc@moltkeplatz.de>
+
+Parsers for Org-mode inline elements.
+-}
+module Text.Pandoc.Readers.Org.BlockStarts
+ ( exampleLineStart
+ , hline
+ , noteMarker
+ , tableStart
+ , drawerStart
+ , headerStart
+ , metaLineStart
+ , latexEnvStart
+ , commentLineStart
+ , bulletListStart
+ , orderedListStart
+ , endOfBlock
+ ) where
+
+import Control.Monad ( void )
+import Text.Pandoc.Readers.Org.Parsing
+
+-- | Horizontal Line (five -- dashes or more)
+hline :: Monad m => OrgParser m ()
+hline = try $ do
+ skipSpaces
+ string "-----"
+ many (char '-')
+ skipSpaces
+ newline
+ return ()
+
+-- | Read the start of a header line, return the header level
+headerStart :: Monad m => OrgParser m Int
+headerStart = try $
+ (length <$> many1 (char '*')) <* many1 (char ' ') <* updateLastPreCharPos
+
+tableStart :: Monad m => OrgParser m Char
+tableStart = try $ skipSpaces *> char '|'
+
+latexEnvStart :: Monad m => OrgParser m String
+latexEnvStart = try $ do
+ skipSpaces *> string "\\begin{"
+ *> latexEnvName
+ <* string "}"
+ <* blankline
+ where
+ latexEnvName :: Monad m => OrgParser m String
+ latexEnvName = try $ mappend <$> many1 alphaNum <*> option "" (string "*")
+
+
+-- | Parses bullet list marker.
+bulletListStart :: Monad m => OrgParser m ()
+bulletListStart = try $
+ choice
+ [ () <$ skipSpaces <* oneOf "+-" <* skipSpaces1
+ , () <$ skipSpaces1 <* char '*' <* skipSpaces1
+ ]
+
+genericListStart :: Monad m
+ => OrgParser m String
+ -> OrgParser m Int
+genericListStart listMarker = try $
+ (+) <$> (length <$> many spaceChar)
+ <*> (length <$> listMarker <* many1 spaceChar)
+
+orderedListStart :: Monad m => OrgParser m Int
+orderedListStart = genericListStart orderedListMarker
+ -- Ordered list markers allowed in org-mode
+ where orderedListMarker = mappend <$> many1 digit <*> (pure <$> oneOf ".)")
+
+drawerStart :: Monad m => OrgParser m String
+drawerStart = try $
+ skipSpaces *> drawerName <* skipSpaces <* newline
+ where drawerName = char ':' *> manyTill nonspaceChar (char ':')
+
+metaLineStart :: Monad m => OrgParser m ()
+metaLineStart = try $ skipSpaces <* string "#+"
+
+commentLineStart :: Monad m => OrgParser m ()
+commentLineStart = try $ skipSpaces <* string "# "
+
+exampleLineStart :: Monad m => OrgParser m ()
+exampleLineStart = () <$ try (skipSpaces *> string ": ")
+
+noteMarker :: Monad m => OrgParser m String
+noteMarker = try $ do
+ char '['
+ choice [ many1Till digit (char ']')
+ , (++) <$> string "fn:"
+ <*> many1Till (noneOf "\n\r\t ") (char ']')
+ ]
+
+-- | Succeeds if the parser is at the end of a block.
+endOfBlock :: Monad m => OrgParser m ()
+endOfBlock = lookAhead . try $ do
+ void blankline <|> anyBlockStart
+ where
+ -- Succeeds if there is a new block starting at this position.
+ anyBlockStart :: Monad m => OrgParser m ()
+ anyBlockStart = try . choice $
+ [ exampleLineStart
+ , hline
+ , metaLineStart
+ , commentLineStart
+ , void noteMarker
+ , void tableStart
+ , void drawerStart
+ , void headerStart
+ , void latexEnvStart
+ , void bulletListStart
+ , void orderedListStart
+ ]
+