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{-# LANGUAGE FlexibleContexts #-}
{-
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.Meta
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 meta declarations.
-}
module Text.Pandoc.Readers.Org.Meta
( metaLine
) where
import Text.Pandoc.Readers.Org.BlockStarts
import Text.Pandoc.Readers.Org.ExportSettings ( exportSettings )
import Text.Pandoc.Readers.Org.Inlines
import Text.Pandoc.Readers.Org.ParserState
import Text.Pandoc.Readers.Org.Parsing
import qualified Text.Pandoc.Builder as B
import Text.Pandoc.Builder ( Blocks, Inlines )
import Text.Pandoc.Definition
import Text.Pandoc.Compat.Monoid ((<>))
import Control.Monad ( mzero )
import Data.Char ( toLower )
import Data.List ( intersperse )
import qualified Data.Map as M
import Network.HTTP ( urlEncode )
-- | Parse and handle a single line containing meta information
-- The order, in which blocks are tried, makes sure that we're not looking at
-- the beginning of a block, so we don't need to check for it
metaLine :: OrgParser Blocks
metaLine = mempty <$ metaLineStart <* (optionLine <|> declarationLine)
declarationLine :: OrgParser ()
declarationLine = try $ do
key <- map toLower <$> metaKey
value <- metaValue key
updateState $ \st ->
let meta' = B.setMeta key <$> value <*> pure nullMeta
in st { orgStateMeta = meta' <> orgStateMeta st }
metaKey :: OrgParser String
metaKey = map toLower <$> many1 (noneOf ": \n\r")
<* char ':'
<* skipSpaces
metaValue :: String -> OrgParser (F MetaValue)
metaValue key = do
case key of
"author" -> metaInlinesCommaSeparated
"title" -> metaInlines
"date" -> metaInlines
_ -> metaString
metaInlines :: OrgParser (F MetaValue)
metaInlines = fmap (MetaInlines . B.toList) <$> inlinesTillNewline
metaInlinesCommaSeparated :: OrgParser (F MetaValue)
metaInlinesCommaSeparated = do
authStrs <- (many1 (noneOf ",\n")) `sepBy1` (char ',')
newline
authors <- mapM (parseFromString inlinesTillNewline . (++ "\n")) authStrs
let toMetaInlines = MetaInlines . B.toList
return $ MetaList . map toMetaInlines <$> sequence authors
metaString :: OrgParser (F MetaValue)
metaString = return . MetaString <$> anyLine
--
-- export options
--
optionLine :: OrgParser ()
optionLine = try $ do
key <- metaKey
case key of
"link" -> parseLinkFormat >>= uncurry addLinkFormat
"options" -> exportSettings
_ -> mzero
addLinkFormat :: String
-> (String -> String)
-> OrgParser ()
addLinkFormat key formatter = updateState $ \s ->
let fs = orgStateLinkFormatters s
in s{ orgStateLinkFormatters = M.insert key formatter fs }
parseLinkFormat :: OrgParser ((String, String -> String))
parseLinkFormat = try $ do
linkType <- (:) <$> letter <*> many (alphaNum <|> oneOf "-_") <* skipSpaces
linkSubst <- parseFormat
return (linkType, linkSubst)
-- | An ad-hoc, single-argument-only implementation of a printf-style format
-- parser.
parseFormat :: OrgParser (String -> String)
parseFormat = try $ do
replacePlain <|> replaceUrl <|> justAppend
where
-- inefficient, but who cares
replacePlain = try $ (\x -> concat . flip intersperse x)
<$> sequence [tillSpecifier 's', rest]
replaceUrl = try $ (\x -> concat . flip intersperse x . urlEncode)
<$> sequence [tillSpecifier 'h', rest]
justAppend = try $ (++) <$> rest
rest = manyTill anyChar (eof <|> () <$ oneOf "\n\r")
tillSpecifier c = manyTill (noneOf "\n\r") (try $ string ('%':c:""))
inlinesTillNewline :: OrgParser (F Inlines)
inlinesTillNewline = trimInlinesF . mconcat <$> manyTill inline newline
|
