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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
Copyright : Copyright (C) 2014-2016 Albert Krewinkel
License : GNU GPL, version 2 or above
Maintainer : Albert Krewinkel <tarleb+pandoc@moltkeplatz.de>
Conversion of org-mode formatted plain text to 'Pandoc' document.
-}
module Text.Pandoc.Readers.Org ( readOrg ) where
import Text.Pandoc.Readers.Org.Blocks ( blockList, meta )
import Text.Pandoc.Readers.Org.Parsing ( OrgParser, readWithM )
import Text.Pandoc.Readers.Org.ParserState ( optionsToParserState )
import Text.Pandoc.Definition
import Text.Pandoc.Error
import Text.Pandoc.Options
import Control.Monad.Reader ( runReader )
-- | Parse org-mode string and return a Pandoc document.
readOrg :: ReaderOptions -- ^ Reader options
-> String -- ^ String to parse (assuming @'\n'@ line endings)
-> Either PandocError Pandoc
readOrg opts s = flip runReader def $
readWithM parseOrg (optionsToParserState opts) (s ++ "\n\n")
--
-- Parser
--
parseOrg :: OrgParser Pandoc
parseOrg = do
blocks' <- blockList
meta' <- meta
return . Pandoc meta' $ removeUnwantedBlocks blocks'
where
removeUnwantedBlocks :: [Block] -> [Block]
removeUnwantedBlocks = dropCommentTrees . filter (/= Null)
-- | Drop COMMENT headers and the document tree below those headers.
dropCommentTrees :: [Block] -> [Block]
dropCommentTrees [] = []
dropCommentTrees (b:bs) =
maybe (b:dropCommentTrees bs)
(dropCommentTrees . flip dropUntilHeaderAboveLevel bs)
(commentHeaderLevel b)
-- | Return the level of a header starting a comment or :noexport: tree and
-- Nothing otherwise.
commentHeaderLevel :: Block -> Maybe Int
commentHeaderLevel blk =
case blk of
(Header level _ ((Str "COMMENT"):_)) -> Just level
(Header level _ title) | hasNoExportTag title -> Just level
_ -> Nothing
where
hasNoExportTag :: [Inline] -> Bool
hasNoExportTag = any isNoExportTag
isNoExportTag :: Inline -> Bool
isNoExportTag (Span ("", ["tag"], [("data-tag-name", "noexport")]) []) = True
isNoExportTag _ = False
-- | Drop blocks until a header on or above the given level is seen
dropUntilHeaderAboveLevel :: Int -> [Block] -> [Block]
dropUntilHeaderAboveLevel n = dropWhile (not . isHeaderLevelLowerEq n)
isHeaderLevelLowerEq :: Int -> Block -> Bool
isHeaderLevelLowerEq n blk =
case blk of
(Header level _ _) -> n >= level
_ -> False
|
