takeWhile1 doesn't stop on end of string

[varosi]

I have this code:

parseClass :: Parser Text
parseClass = do
    string "Class" <|> string "class"
    skipSpace
    takeWhile1 isAlpha

When I call it in GHCi I got this results:

*Lib> maybeResult . parse parseClass' $ (pack "Class Test ")
Just "Test"
*Lib> maybeResult . parse parseClass' $ (pack "Class Test")
Nothing

[basvandijk]

What if you place a endOfInput at the end?

[varosi]

I would like to match "parseClass" parser no matter if it is in the middle or at the end of input.

[googleson78]

@varosi maybeResult converts Partial values to Nothings - this is intended behaviour. You need to feed it an empty input (empty string) in order for the Partial to turn into a Done so that maybeResult will return a Just.

[varosi]

Thanks! На ср, 12.12.2018 г., 15:25 ч. Georgi Lyubenov [email protected] написа:

@varosi https://github.com/varosi maybeResult converts Partial values to Nothings - this is intended behaviour. You need to feed it an empty input (empty string) in order for the Partial to turn into a Done so that maybeResult will return a Just.

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