Introduce NonConsumingExact which doesn't consume whitespace at the beginning of the string #17
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parcon.Exactdoesn't play nicely out-of-the-box when trying to match whitespace at the start of a string. I've added some tests for the existing behaviour, including usingthing.parse_string(s, whitespace=parcon.Invalid()), but I also wanted something which didn't require explicitly passing in thewhitespaceargument, hence creatingparcon.NonConsumingExact. The only difference is that it doesn't bother to dospace.consume(...)(whichparcon.Exact.parsedoes do).Also, naming things is hard; I don't really like this name, but it's 11pm and I couldn't come up with anything better.