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Logs: liberachat/#haskell

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2021-08-27 23:38:47 × azeem quits (~azeem@5.168.199.98) (Ping timeout: 240 seconds)
2021-08-27 23:43:51 × acidjnk_new quits (~acidjnk@p200300d0c72b95925da55fe159cc0756.dip0.t-ipconnect.de) (Ping timeout: 250 seconds)
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2021-08-28 00:05:56 <hololeap> cycle. thanks
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2021-08-28 00:51:32 <iqubic> So, I'm trying to remember how to use parsec, and I'm hitting a roadblock. I would like to be able to parse a string full of only digits (I.E. "1432912902156") into a [Int]. What's the best way to do that?
2021-08-28 00:52:42 <pavonia> To [1,4,3,2,...] in that example?
2021-08-28 00:53:07 <iqubic> Yes. Correct.
2021-08-28 00:53:28 <iqubic> I want to parse it to a [Int] where each element is in the range 0-9 inclusive
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2021-08-28 00:54:13 <pavonia> many1 $ (\c -> ord c - ord '0') <$> satisfy isDigit
2021-08-28 00:55:18 <iqubic> How does that work?
2021-08-28 00:56:04 × merijn quits (~merijn@83-160-49-249.ip.xs4all.nl) (Ping timeout: 252 seconds)
2021-08-28 00:56:20 <dsal> > ord '3' - ord '0'
2021-08-28 00:56:22 <lambdabot> 3
2021-08-28 00:56:45 <dsal> I think megaparsec has a digit.
2021-08-28 00:57:37 <dsal> > digitToInt '3'
2021-08-28 00:57:39 <lambdabot> 3
2021-08-28 00:57:59 <pavonia> Ah nice
2021-08-28 00:58:21 <dsal> Megaparsec has digitChar. I assume that's `satisfy isDigit`
2021-08-28 00:58:55 <dsal> digitChar = satisfy isDigit <?> "digit"
2021-08-28 00:59:10 <pavonia> Is GHC able to optimize constant function application like ord '0'?
2021-08-28 00:59:32 <eggplant_> yes
2021-08-28 01:00:45 <dsal> digitToInt includes `dec = ord c - ord '0'` but is more complicated with hex and what-not
2021-08-28 01:02:36 <pavonia> > map digitToInt "09afg"
2021-08-28 01:02:38 <lambdabot> [0,9,10,15,*Exception: Char.digitToInt: not a digit 'g'
2021-08-28 01:03:01 <dsal> Yeah, it's also partial
2021-08-28 01:04:15 <pavonia> > digitToInt '０'
2021-08-28 01:04:16 <lambdabot> *Exception: Char.digitToInt: not a digit '\65296'
2021-08-28 01:04:23 <pavonia> Too bad
2021-08-28 01:05:16 <pavonia> There are many Unicode characters that have a numerical value
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2021-08-28 01:15:49 × markpythonicbtc quits (~textual@2601:647:5a00:35:c862:7d44:846c:a0b5) (Quit: My MacBook has gone to sleep. ZZZzzz…)
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2021-08-28 01:23:21 <iqubic> So is there no built in megaparsec parser for single digit numbers? I have to roll my own?
2021-08-28 01:27:17 → azeem joins (~azeem@5.168.221.147)
2021-08-28 01:27:21 <dsal> @hoogle digitChar
2021-08-28 01:27:21 <lambdabot> Text.Megaparsec.Byte digitChar :: (MonadParsec e s m, Token s ~ Word8) => m (Token s)
2021-08-28 01:27:21 <lambdabot> Text.Megaparsec.Char digitChar :: (MonadParsec e s m, Token s ~ Char) => m (Token s)
2021-08-28 01:27:21 <lambdabot> Toml.Parser.Core digitChar :: (MonadParsec e s m, Token s ~ Char) => m (Token s)
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2021-08-28 01:29:01 <iqubic> What I want is this:
2021-08-28 01:29:03 <iqubic> type Parser = Parsec Void String
2021-08-28 01:29:09 <iqubic> singleDigit :: Num a => Parser a
2021-08-28 01:29:31 <iqubic> Which will parse a single character, and succeed only if that character is a digit.
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2021-08-28 01:30:19 <iqubic> How can get that?
2021-08-28 01:30:36 <hololeap> iqubic: look at Text.Parsec.Char.alphaNum
2021-08-28 01:30:42 <dsal> You fmap digitToInt over digitChar
2021-08-28 01:31:00 <iqubic> dsal, won't that give me an Int?
2021-08-28 01:31:13 <iqubic> won't I have to then fmap fromIntegral?
2021-08-28 01:31:48 <dsal> OK, then `fmap (fromIntegral . digitToInt) digitChar`
2021-08-28 01:32:05 × aplainzetakind quits (~johndoe@captainludd.powered.by.lunarbnc.net) (Quit: Free ZNC ~ Powered by LunarBNC: https://LunarBNC.net)
2021-08-28 01:32:17 × merijn quits (~merijn@83-160-49-249.ip.xs4all.nl) (Ping timeout: 248 seconds)
2021-08-28 01:33:26 hololeap meant .digit
2021-08-28 01:35:41 <iqubic> Weird. Megaparsec only has digitChar.
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