Hi,
module Main(main) where
import Text.ParserCombinators.Parsec
parseToNewLine = do
line <- manyTill anyChar newline
return line
keyValue = do
fieldName <- many letter
spaces
char '='
spaces
fieldValue <- parseToNewLine
return (fieldName,fieldValue)
main = parseTest keyValue "key=\n"
I don’t understand why te code above doesn’t parse to (“key”,””)
Because the newline is already consumed by the `spaces`. So parseToNewLine gets an empty string as input, and fails on that.
parseToNewLine “\n” parses to “"
parseTest keyValue “a=b\n” works fine and parses to (“a”,”b”)
The input of parseToNewLine must contain a newline, or it fails. In the last example, the `spaces` after `char '='` stops at reaching the 'b', so the newline remains. In the first (problematic) example, all the remaining input after the '=' consists of whitespace. Thanks. This solves it. spaces does more then just reading spaces. Kees