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. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#111 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AFxXht47g-DDK56qwrUGHWYCjpMDn8Opks5u4QPTgaJpZM4Gd666> .