hnix/Nix/Parser/Library.hs

93 lines
2.3 KiB
Haskell

{-# LANGUAGE CPP #-}
module Nix.Parser.Library ( module Nix.Parser.Library, module X ) where
import Control.Applicative
#if USE_PARSEC
import Control.Monad
import Control.Monad.IO.Class
import Data.Text as T
import Data.Text.IO as T
import Text.Parsec as X hiding ((<|>), many, optional)
import Text.Parsec.Expr as X
import Text.Parsec.Text as X
import qualified Text.Parsec.Token as P
import Text.PrettyPrint.ANSI.Leijen as X (Doc, text)
lexer :: Stream s m Char => P.GenTokenParser s u m
lexer = P.makeTokenParser P.LanguageDef
{ P.commentStart = "/*"
, P.commentEnd = "*/"
, P.commentLine = "#"
, P.nestedComments = True
, P.identStart = letter <|> char '_'
, P.identLetter = alphaNum <|> oneOf "_."
, P.opStart = oneOf ":!#$%&*+./<=>?@\\^|-~"
, P.opLetter = oneOf "@"
, P.reservedNames =
[ "let", "in"
, "if", "then", "else"
, "true", "false"
, "null"
, "assert"
, "with"
, "rec"
, "inherit"
, "or"
]
, P.reservedOpNames = []
, P.caseSensitive = True
}
parens :: Parser a -> Parser a
parens = P.parens lexer
brackets :: Parser a -> Parser a
brackets = P.brackets lexer
braces :: Parser a -> Parser a
braces = P.braces lexer
identifier :: Parser Text
identifier = pack <$> P.identifier lexer
reserved :: String -> Parser ()
reserved = P.reserved lexer
symbol :: String -> Parser Text
symbol str = pack <$> P.symbol lexer str
symbolic :: Char -> Parser Char
symbolic c = char c <* whiteSpace
decimal :: Parser Integer
decimal = read <$> some digit
whiteSpace :: Parser ()
whiteSpace = P.whiteSpace lexer
data Result a = Success a
| Failure Doc
parseFromFileEx :: MonadIO m => Parser a -> FilePath -> m (Result a)
parseFromFileEx p path =
(either (Failure . text . show) Success . parse p path)
`liftM` liftIO (T.readFile path)
#else
import Text.Parser.Expression as X
import Text.Parser.LookAhead as X
import Text.Parser.Token as X
import Text.Trifecta as X
#endif
someTill :: Parser a -> Parser end -> Parser [a]
someTill p end = go
where
go = (:) <$> p <*> scan
scan = (end *> return []) <|> go