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|
{-# LANGUAGE NoImplicitPrelude #-}
{- |
Module : Text.Pandoc.Readers.Org.Parsing
Copyright : Copyright (C) 2014-2019 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
, anyLineNewline
, indentWith
, blanklines
, newline
, parseFromString
, skipSpaces1
, inList
, withContext
, getExportSetting
, updateLastForbiddenCharPos
, updateLastPreCharPos
, orgArgKey
, orgArgWord
, orgArgWordChar
, orgTagWord
, orgTagWordChar
-- * 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
, gridTableWith
, insertIncludedFileF
-- * Re-exports from Text.Pandoc.Parsec
, runParser
, runParserT
, getInput
, char
, letter
, digit
, alphaNum
, skipMany1
, spaces
, anyChar
, satisfy
, string
, count
, eof
, noneOf
, oneOf
, lookAhead
, notFollowedBy
, many
, many1
, manyTill
, (<|>)
, (<?>)
, choice
, try
, sepBy
, sepBy1
, sepEndBy1
, option
, optional
, optionMaybe
, getState
, updateState
, SourcePos
, getPosition
) where
import Prelude
import Text.Pandoc.Readers.Org.ParserState
import Text.Pandoc.Parsing hiding (F, anyLine, blanklines, newline,
parseFromString)
import qualified Text.Pandoc.Parsing as P
import Control.Monad (guard)
import Control.Monad.Reader (ReaderT)
-- | The parser used to read org files.
type OrgParser m = ParserT [Char] OrgParserState (ReaderT OrgParserLocal m)
--
-- Adaptions and specializations of parsing utilities
--
-- | Parse any line of text
anyLine :: Monad m => OrgParser m String
anyLine =
P.anyLine
<* updateLastPreCharPos
<* updateLastForbiddenCharPos
-- | Like @'Text.Pandoc.Parsing'@, but resets the position of the last character
-- allowed before emphasised text.
parseFromString :: Monad m => OrgParser m a -> String -> OrgParser m a
parseFromString parser str' = do
updateState $ \s -> s{ orgStateLastPreCharPos = Nothing }
result <- P.parseFromString parser str'
updateState $ \s -> s { orgStateLastPreCharPos = Nothing }
return result
-- | Skip one or more tab or space characters.
skipSpaces1 :: Monad m => OrgParser m ()
skipSpaces1 = skipMany1 spaceChar
-- | Like @Text.Parsec.Char.newline@, but causes additional state changes.
newline :: Monad m => OrgParser m Char
newline =
P.newline
<* updateLastPreCharPos
<* updateLastForbiddenCharPos
-- | Like @Text.Parsec.Char.blanklines@, but causes additional state changes.
blanklines :: Monad m => OrgParser m [Char]
blanklines =
P.blanklines
<* updateLastPreCharPos
<* updateLastForbiddenCharPos
-- | Succeeds when we're in list context.
inList :: Monad m => OrgParser m ()
inList = do
ctx <- orgStateParserContext <$> getState
guard (ctx == ListItemState)
-- | Parse in different context
withContext :: Monad m
=> ParserContext -- ^ New parser context
-> OrgParser m a -- ^ Parser to run in that context
-> OrgParser m a
withContext context parser = do
oldContext <- orgStateParserContext <$> getState
updateState $ \s -> s{ orgStateParserContext = context }
result <- parser
updateState $ \s -> s{ orgStateParserContext = oldContext }
return result
--
-- Parser state functions
--
-- | Get an export setting.
getExportSetting :: Monad m => (ExportSettings -> a) -> OrgParser m a
getExportSetting s = s . orgStateExportSettings <$> getState
-- | 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 :: Monad m => OrgParser m ()
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 :: Monad m => OrgParser m ()
updateLastPreCharPos = getPosition >>= \p ->
updateState $ \s -> s{ orgStateLastPreCharPos = Just p}
--
-- Org key-value parsing
--
-- | Read the key of a plist style key-value list.
orgArgKey :: Monad m => OrgParser m String
orgArgKey = try $
skipSpaces *> char ':'
*> many1 orgArgWordChar
-- | Read the value of a plist style key-value list.
orgArgWord :: Monad m => OrgParser m String
orgArgWord = many1 orgArgWordChar
-- | Chars treated as part of a word in plists.
orgArgWordChar :: Monad m => OrgParser m Char
orgArgWordChar = alphaNum <|> oneOf "-_"
orgTagWord :: Monad m => OrgParser m String
orgTagWord = many1 orgTagWordChar
orgTagWordChar :: Monad m => OrgParser m Char
orgTagWordChar = alphaNum <|> oneOf "@%#_"
|
