Text.Megaparsec.Text.Lazy

Convenience definitions for working with lazy Text.

Documentation

type Parser = Parsec Text

Different modules corresponding to various types of streams (String, Text, ByteString) define it differently, so user can use “abstract” Parser type and easily change it by importing different “type modules”. This one is for lazy text.

parseFromFile :: Parser a -> String -> IO (Either ParseError a)

parseFromFile p filePath runs a lazy text parser p on the input read from filePath using readFile. Returns either a ParseError (Left) or a value of type a (Right).

main = do
  result <- parseFromFile numbers "digits.txt"
  case result of
    Left err -> print err
    Right xs -> print (sum xs)