This channel is intended for people just starting with the Raku Programming Language (raku.org). Logs are available at irclogs.raku.org/raku-beginner/live.html
Set by lizmat on 8 June 2022.
05:01 soverysour joined 05:35 soverysour left 05:38 soverysour joined 06:05 soverysour left 07:00 ACfromTX left
disbot3 <oshaboy> is there any reason I cant do sub MAIN(Uni $str)? 09:22
<oshaboy> I want to take input without normalization 09:23
<librasteve> lemme try 09:25
09:34 soverysour joined
disbot3 <librasteve> @oshaboy my initial reply is that this is not implemented OOTB (I am not an expert, so others are welcome to correct me) ... the reason being that there is no way to write Uni.new('abc'.codes); as you enter the arg on the command line (since that is not a raku program, but a list of unix args) 09:40
<oshaboy> So basically I made these tiles in Python and I now have a folder with 155k of these 09:41
<oshaboy> cdn.discordapp.com/attachments/768...c7a1b&
<librasteve> the natural way to iimplement this would be to go sub MAIN(Uni(Str) $str) - note the coercion ... but to get there you will need to make a custom coercer and mix it into the Uni class 09:42
09:42 soverysour left
disbot3 <oshaboy> so I tried writing a raku program to take a string as argument and copy the tiles needed to form them from one folder to the other 09:42
<oshaboy> so it will be easier to sort through
<oshaboy> the problem is I need the string to be unnormalized
<oshaboy> but that would NFC it, right? 09:43
<librasteve> ah - yes, I guess that would normalize (via the usual Str arg consumption) and then denormalize it ... 09:46
lizmat perhap: sub MAIN(NFD() $a) ? 09:47
disbot3 <librasteve> lizmat: you're a genius 09:48
<oshaboy> cdn.discordapp.com/attachments/768...38803& 09:50
<oshaboy> normalization is a lossy process
<oshaboy> Ok but I want it to distinguish \u00E9 from \u0065\u0301 09:51
lizmat then I'm afraid you can't do that with entering codes at the command line, as they all get normalized before reaching MAIN logic 09:52
disbot3 <oshaboy> Ok turns out arguments to main are in UTF8C8 09:57
lizmat doublechecked: command line processing at that level lives deep in NQP land, in HLL::Compiler
disbot3 <oshaboy> sub utf8_len(uint8 $a){ given $a { when 0..0x80 { return 1; } when 0x80..0xc0 { return 0; } when 0xc0..0xe0 { return 2; } when 0xe0..0xf0 { return 3; } when 0xf0..0xf5 { return 4; } default { return 0; } } } sub to_uni(utf8 $blob){ my 11:18
$codes=[]; my $buf=$blob.Buf; while ($buf.elems > 0) { my $len=utf8_len($buf[0]); if ($len == 0) { return (); } my $codepoint=Blob[uint8].new($buf.head($len)); $codes.append($codepoint.decode('utf8').ords[0]); $buf=$buf.splice($len, $buf.elems); } return Uni.new($codes.List); }
<oshaboy> I just implemented it myself
<oshaboy> There should be an easier way to convert utf8 to a Uni without normalization but IDK 11:22
lizmat oshaboy putting code in a gist makes it easier for people to look at 11:27
disbot3 <oshaboy> I know but I also don't really care 11:28
<oshaboy> I just hacked it together until it works
11:29 soverysour joined, soverysour left, soverysour joined
lizmat ok, so you're not interested in a review of your code ? 11:32
disbot3 <oshaboy> nah 11:50
11:54 lizmat left 11:55 lizmat_ left, lizmat joined 12:20 soverysour left 12:37 soverysour joined, soverysour left, soverysour joined 14:28 soverysour left 14:42 soverysour joined 16:04 stanrifkin joined 16:12 soverysour left 16:21 stanrifkin left 16:22 soverysour joined 16:27 soverysour left
disbot3 <apogee> How do you pass a callback to a function and then invoke it in the function? 19:05
lizmat m: sub a() { say "hi" }; sub b(&code) { code() }; b(&a) 19:14
camelia hi
lizmat apogee ^^
disbot3 <apogee> m: sub b (&code) { code("world") }; sub a ($val) { say "hello, $val" }; b(&a) 19:21
<Raku eval> hello, world
<apogee> Interesting
<apogee> I have pl sub dubz ($v) { Monad::Maybe.new(value => $v * 2) } ... my $bound = $some.bind(&dubz); pl method bind(&f --> Monad) { return self if (!defined $.value); my $result = f($.value); die "bind must return a Monad" unless $result ~~ Monad; return $result; } And $result is True. I would expect it to be a Monad? 19:23
timo tangentially, do you know "without"? 19:25
`return self without $.value` is a bit nicer to read than `return self if (!defined $.value)` IMO
disbot3 <apogee> TIL
<apogee> Yes much more readable
timo from just the code you pasted it looks like it shouldn't be True, but there may be something in the parts not shown? 19:26
disbot3 <apogee> Uh, changing that made my test pass wut
<apogee> lol
<apogee> pl unit class Monad; method unit($value) { self.^name.new(value => $value) } method bind($f) { die "bind() must be implemented by subclass" } method map($f --> Monad) { self.bind(-> $v { self.unit($f($v)) }) } method Str { self.gist } sub infix:<\>\>=> ($m, $f --> Monad) is export { $m.bind($f) } pl use Monad; unit class Monad::Maybe is Monad; has $.value; method bind(&f --> Monad) { 19:27
return self without $.value; my $result = f($.value); die "bind must return a Monad" unless $result ~~ Monad; return $result; } method gist { defined $.value ?? "Some($.value)" !! "None"; }
<apogee> I need to add Some and None properly but uh very confused now 😄 19:28
lizmat apogee: that might look good on Discord, but here on IRC it's close to unreadable :-(
apogee self.^name.new huh? don't you mean self.new ? 19:29
disbot3 <apogee> Oh yeah I originally made that a role 19:30
19:30 soverysour joined
lizmat roles autopun 19:30
disbot3 <tpaul64_18694> godbolt.org/z/aTo4jrfYq seems to work with if (!defined $.value) but also with without $.value here 19:33
19:43 soverysour left 20:25 soverysour joined, soverysour left, soverysour joined 21:08 librasteve_ left 21:11 soverysour left
disbot3 <apogee> Yeah it was because I didnt have the block around !defined $value I think. I'm still thinking in perl. 😄 21:18
<apogee> Or I did, idk it works now 🙃 21:20
<apogee> OK now I'm very stumped paste2.org/WEXjss1W Tests hang forever 21:47
<apogee> Any idea lizmet? 😄 21:53
<apogee> lizmat*
<apogee> It's calling that function infinitely... 21:54
<apogee> I had a method with the same name as an attribute and it was calling it infinitely lol. 21:58
<apogee> Used . instead of !
SmokeMachine apogee: usually something like `self.new(value => $value);` I prefer to write like: `self.new: :$value;` but that’s personal taste… 22:11
disbot3 <apogee> Just pushed a few Monads to zef. 22:43
<apogee> github.com/m-doughty/Raku-Monad Reviews & PRs welcome. 22:44
lizmat there's also: raku.land/zef:rawleyfowler/Monad-Result does that overlap? 22:49
22:54 Guest45 joined 22:57 Guest45 left
disbot3 <apogee> It implements a variant of one of the Monads I implemented, yeah. Either and Result kinda do the same thing. 22:59
<apogee> Either is Haskell, Result is OCaml.

Powered by Cro and the Raku® Programming Language.

Please report any issues / comments / feature requests as an issue on App::Raku::Log.

Thank you!