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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>
Org-mode parsing utilities.
Most functions are simply re-exports from @Text.Pandoc.Parsing@, some
functions are adapted to Org-mode specific functionality.
-}
module Text.Pandoc.Readers.Org.Parsing
( OrgParser
, anyLine
, blanklines
, newline
, parseFromString
, skipSpaces1
, inList
, withContext
, updateLastForbiddenCharPos
, updateLastPreCharPos
, orgArgKey
, orgArgWord
, orgArgWordChar
-- * Re-exports from Text.Pandoc.Parser
, ParserContext (..)
, many1Till
, notFollowedBy'
, spaceChar
, nonspaceChar
, skipSpaces
, blankline
, enclosed
, stringAnyCase
, charsInBalanced
, uri
, withRaw
, readWithM
, guardEnabled
, updateLastStrPos
, notAfterString
, ParserState (..)
, registerHeader
, QuoteContext (..)
, singleQuoteStart
, singleQuoteEnd
, doubleQuoteStart
, doubleQuoteEnd
, dash
, ellipses
, citeKey
-- * Re-exports from Text.Pandoc.Parsec
, runParser
, getInput
, char
, letter
, digit
, alphaNum
, skipMany1
, spaces
, anyChar
, satisfy
, string
, count
, eof
, noneOf
, oneOf
, lookAhead
, notFollowedBy
, many
, many1
, manyTill
, (<|>)
, (<?>)
, choice
, try
, sepBy
, sepBy1
, option
, optional
, optionMaybe
, getState
, updateState
, SourcePos
, getPosition
) where
import Text.Pandoc.Readers.Org.ParserState
import qualified Text.Pandoc.Parsing as P
import Text.Pandoc.Parsing hiding ( anyLine, blanklines, newline
, parseFromString )
import Control.Monad ( guard )
import Control.Monad.Reader ( Reader )
-- | The parser used to read org files.
type OrgParser = ParserT [Char] OrgParserState (Reader OrgParserLocal)
--
-- Adaptions and specializations of parsing utilities
--
-- | Parse any line of text
anyLine :: OrgParser String
anyLine =
P.anyLine
<* updateLastPreCharPos
<* updateLastForbiddenCharPos
-- The version Text.Pandoc.Parsing cannot be used, as we need additional parts
-- of the state saved and restored.
parseFromString :: OrgParser a -> String -> OrgParser a
parseFromString parser str' = do
oldLastPreCharPos <- orgStateLastPreCharPos <$> getState
updateState $ \s -> s{ orgStateLastPreCharPos = Nothing }
result <- P.parseFromString parser str'
updateState $ \s -> s{ orgStateLastPreCharPos = oldLastPreCharPos }
return result
-- | Skip one or more tab or space characters.
skipSpaces1 :: OrgParser ()
skipSpaces1 = skipMany1 spaceChar
-- | Like @Text.Parsec.Char.newline@, but causes additional state changes.
newline :: OrgParser Char
newline =
P.newline
<* updateLastPreCharPos
<* updateLastForbiddenCharPos
-- | Like @Text.Parsec.Char.blanklines@, but causes additional state changes.
blanklines :: OrgParser [Char]
blanklines =
P.blanklines
<* updateLastPreCharPos
<* updateLastForbiddenCharPos
-- | Succeeds when we're in list context.
inList :: OrgParser ()
inList = do
ctx <- orgStateParserContext <$> getState
guard (ctx == ListItemState)
-- | Parse in different context
withContext :: ParserContext -- ^ New parser context
-> OrgParser a -- ^ Parser to run in that context
-> OrgParser a
withContext context parser = do
oldContext <- orgStateParserContext <$> getState
updateState $ \s -> s{ orgStateParserContext = context }
result <- parser
updateState $ \s -> s{ orgStateParserContext = oldContext }
return result
--
-- Parser state update functions
--
-- | Set the current position as the last position at which a forbidden char
-- was found (i.e. a character which is not allowed at the inner border of
-- markup).
updateLastForbiddenCharPos :: OrgParser ()
updateLastForbiddenCharPos = getPosition >>= \p ->
updateState $ \s -> s{ orgStateLastForbiddenCharPos = Just p}
-- | Set the current parser position as the position at which a character was
-- seen which allows inline markup to follow.
updateLastPreCharPos :: OrgParser ()
updateLastPreCharPos = getPosition >>= \p ->
updateState $ \s -> s{ orgStateLastPreCharPos = Just p}
orgArgKey :: OrgParser String
orgArgKey = try $
skipSpaces *> char ':'
*> many1 orgArgWordChar
orgArgWord :: OrgParser String
orgArgWord = many1 orgArgWordChar
orgArgWordChar :: OrgParser Char
orgArgWordChar = alphaNum <|> oneOf "-_"
|
