digit is predefined parser. The implementation is similar to
digit = oneOf "0123456789"
Be sure to read carefully though. At the beginning of Chapter 2 (Parsing) it
reads:
*Parsec provides a number of pre-built parsers: for example, letter and
digit are library functions.*
Also, I recommend downloading the ebook as PDF. It is easier to read that
way.
Best regards,
Krzysztof Skrzętnicki
On Sat, Apr 9, 2011 at 03:45, Michael Litchard
I'm working through "Write yourself a Scheme in 48 hours". I'm on the parsing section http://en.wikibooks.org/wiki/Write_Yourself_a_Scheme_in_48_Hours/Parsing
and I have a question about the following function
parseNumber :: Parser LispVal parseNumber = liftM (Number . read) $ many1 digit
digit looks like a variable, but I don't see it mentioned anywhere. Where is the input coming from? Is this an example of partial application?
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