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{- Copyright © 2015 Benjamin Barenblat
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 3 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, see <http://www.gnu.org/licenses/>. -}
module Fragment ( Fragment
, parseStdin
, parseFile
, ParseError) where
import Data.Data (Data)
import Data.Typeable (Typeable)
import GHC.Generics (Generic)
import Control.Applicative ((<$>), (<*>), pure)
import Control.Monad (void)
import System.IO (hGetContents, stdin)
import Text.Parsec
import Text.Parsec.String
data Fragment = Documentation String
| BlockCode String String
deriving (Eq, Show, Data, Typeable, Generic)
parseStdin :: IO (Either ParseError [Fragment])
parseStdin = parse literateFile "<stdin>" <$> hGetContents stdin
parseFile :: FilePath -> IO (Either ParseError [Fragment])
parseFile = parseFromFile literateFile
literateFile :: Parser [Fragment]
literateFile = alternate documentation blockCode
documentation :: Parser Fragment
documentation = Documentation <$> manyTill anyChar (void (string "<<") <|> eof)
blockCode :: Parser Fragment
blockCode =
BlockCode <$> manyTill anyChar (void $ string ">>=")
<*> manyTill anyChar (void $ char '@')
alternate :: Parser a -> Parser a -> Parser [a]
alternate x y = (:) <$> x <*> (alternate y x <|> pure [])
|
