What are the reasons for using parser combinators?

Question

I am considering the following approach to using parser combinators in Haskell. The author gives the following example of Parser combinators:

windSpeed :: String -> Maybe Int
windSpeed windInfo =
    parseMaybe windSpeedParser windInfo

windSpeedParser :: ReadP Int
windSpeedParser = do
    direction <- numbers 3
    speed <- numbers 2 <|> numbers 3
    unit <- string "KT" <|> string "MPS"
    return speed

The author gives the following reasons for this approach:

• easy to read (I agree with that)
• similar specification format, i.e. the analyzer itself is basically a description of what it analyzes (I agree with that)

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Answer 1

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