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Set by lizmat on 25 August 2021.
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Voldenet m: (^10).reduce({($^a), $^b}).flat.say 02:36
camelia (((((((((0 1) 2) 3) 4) 5) 6) 7) 8) 9)
Voldenet m: sub flatten($_) { $_ ~~ Iterable ?? |$_.map(&flatten) !! $_ }; (^10).reduce({($^a), $^b}).&flatten.say 02:38
camelia (0 1 2 3 4 5 6 7 8 9)
drakonis hm, coerce protocol? 03:14
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Voldenet coerce protocol is pretty useful, but undocumented 04:02
m: class Hello { has $.i; multi method COERCE(Int() $i) { Hello.new(:$i) }}; sub x(Hello() $h) { say $h }; x("42") 04:03
camelia Hello.new(i => 42)
Voldenet this is as useful as undocumented
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saint- Hey! So I have a grammar which parses something as shown here andrewshitov.com/2018/10/31/a-simp...-grammars/ but I was wondering once I have the match object, how do I navigate through the parse tree? For example if I want to print out only all the "assignment" tokens or "expression" tokens in this example 11:16
tellable6 2021-12-16T11:06:00Z #raku <tbrowder> .ask ssaint what kind of mobile app do you want?
nine saint-: Match objects do the Positional and Associative roles, i.e. they can be used like they were arrays or hashes for accessing groups and sub-rules. E.g. $my-match<assignment> 11:22
m: say $*RAKU.compiler.version 11:23
camelia v2022.04.87.g.77.bc.03047
nine tbrowder: ^^^
saint- nine it seems though I can't access a second level group though 11:25
nine You mean sub-rules of ssignment? That would be $my-match<assignment><whatever>. Providing that whatever is actually a named rule/token/regex and that there is exactly one assignment in your match. 11:27
saint- nine What if there are multiple matches
I'll give you an example, one sec 11:28
www.toptal.com/developers/hastebin...properties This is my output 11:29
I want to just print "plainBlock" for example 11:30
All of them
Or "refBlock"
And this is my code: www.toptal.com/developers/hastebin...ceyeku.xml 11:31
Xliff \o
nine saint-: that'd be $match<block>[0]<plainBlock> 11:34
Xliff saint: Then it looks like you would use $match[$idx]<block><plainBlock> 11:35
saint- Oh thank you! And is there a way to print just the matched text and not the subsequent parse tree?
nine Or for all of them $match<block>.map(*<plainBlock>).grep(*.defined)
stringify the resulting match object: $match[$idx]<block><plainBlock>.Str 11:36
saint- Thanks a lot nine ! It's making sense now 11:40
Xliff What's the best way to tell if a match object is Associative or Positional, then? 11:41
tbrowder .tell nine thanks!
tellable6 tbrowder, I'll pass your message to nine
Xliff m: my token letter { \w }; my token word { <letter>+ }; my $m = "abcd efgh ijk" ~~ / <word>; $m.gist.say 11:42
camelia ===SORRY!===
Unrecognized regex metacharacter ; (must be quoted to match literally)
at <tmp>:1
------> + }; my $m = "abcd efgh ijk" ~~ / <word>⏏; $m.gist.say
Unable to parse regex; couldn't find final '/'
at <tmp>:1
------> …
Xliff m: my token letter { \w }; my token word { <letter>+ }; my $m = "abcd efgh ijk" ~~ / <word> /; $m.gist.say 11:43
camelia 「abcd」
word => 「abcd」
letter => 「a」
letter => 「b」
letter => 「c」
letter => 「d」
Xliff m: my token letter { \w }; my token word { <letter>+ }; my $m = "abcd efgh ijk" ~~ / <word>+ /; $m.gist.say
camelia 「abcd」
word => 「abcd」
letter => 「a」
letter => 「b」
letter => 「c」
letter => 「d」
Xliff m: my token letter { \w }; my token word { <letter>+ }; my $m = "abcd efgh ijk" ~~ m:g/ <word>+ /; $m.gist.say
camelia (「abcd」
word => 「abcd」
letter => 「a」
letter => 「b」
letter => 「c」
letter => 「d」 「efgh」
word => 「efgh」
letter => 「e」
letter => 「f」
letter => 「g」
letter => 「h」 「ijk…
tbrowder regarding the term 4pi thing, i can use it in scope as above but i'm trying to put it in a module and export it. i haven't been successful trying the usual syntax 11:46
m: constant term:<4pi> is export = 4*pi; 11:49
camelia ( no output )
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tbrowder well, so far so good, in my other effort i had the "is export" on the other side of the = 11:51
back to the modue ... Math::Trig 11:52
nope, had syntax right, i just couldn't read it successfully by using that module 12:01
i can try the direct reading qualifying it by name of module... 12:02
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saint- Could someone explain how $match<block>.map(*<plainBlock>) ? As in could someone point me to how * or . works in a routine 12:11
Been trying to find out where I can read how they work but haven't been able to yet
This example is more confusing -- say ('hello', 1, 22/7, 42, 'world').map: { .^name } 12:12
Okay I just figured out about the colon syntax, but yeah wondering about the . vs * 12:14
nine saint-: docs.raku.org/type/Whatever#index-...r-currying 12:21
tellable6 2022-06-05T11:41:53Z #raku <tbrowder> nine thanks!
tbrowder i tried using the EXPORT sub but no go, i give up :-(
nine tbrowder: if something is so hard, it's usually worth asking the question if what you want to do is even a good idea 12:22
saint- Thanks nine !
tbrowder nine: exactly, it's not worth the effort 12:23
thanks for the cold water 12:24
Anton Antonov I can find the roles of a class with $class.^roles , but it seems I cannot do that for a grammar, i.e. $grammar.^roles does not work. Is there some alternative that works for grammars? 12:26
nine m: grammar Foo { }; say Foo.^roles.elems 12:27
camelia 1
nine Looks like ^roles on grammars works just fine
Anton Antonov @nine Please try `say Foo.^roles` -- you will get the error "Cannot find method 'find_method' on object of type NQPParametricRoleHOW". 12:45
moritz but that's a problem with the stringifcation of the type names, not with .^roles 12:50
m: grammar Foo { }; say .^name for Foo.^roles;
camelia NQPMatchRole
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Anton Antonov <@171354420292878346>tz Ok. Still, I cannot find the roles of a grammar using `.^roles` . 12:59
nine But you can? .^roles gives you the roles 13:00
You expect to be able to do specific things with those roles (like just stringify or gist them) you get and that's where you fail. 13:01
moritz I haven't read the full backlog... where's the code?
nine m: grammar Foo does Numeric { }; dd Foo.^roles.map(*.^name) 13:02
camelia ("Numeric", "NQPMatchRole").Seq
Anton Antonov @nine Ok. My mistake, `$grammar.^roles.map({ $_.^name })` works. 13:08
It looks same / similar observations apply when using `.^attributes` on grammars. 13:18
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ecocode[m] Hello, I have 3 arrays with different quantity of items ie: A=[a1,a2,a3] , B=[b1,b2], C=[c1,c2,c3,c4]. I want to to generate an array containing all possible combinations like: [a1,b1,c1], [a1,b1,c2] ... [a3,b2,c4] 14:00
In this case, the order is not particularly important.
Since raku has a lot of operators, which one would be the cleaniest one ? Speed is not really important, code maintainablility is the main priority.
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moritz why an operator and not just a function? 14:05
ecocode[m] because @result =@A x @B x @C would be sooo nice 😉 14:06
moritz but above you listed maintainablility as your main priority, not conciseness or beatuy :D 14:09
ecocode[m] and if it would be even more nicier if it was lazy
moritz laziness is orthogonal to operator vs. function 14:10
ecocode[m] yeah, you can forget about lazy as requirement 😉 but beauty is of course important, otherwise I would use Python 😉 14:12
moritz there are symbols for joins in Unicode 14:14
maybe a good option for this one?
full outer join is roughly what you want 14:15
ecocode[m] that gives an error 14:21
but found the solution ! `@a = @A X @B X @C` works
I wasn't far 😉
moritz m: sub infix:<⟗>($x, $y) {say $x + $y }; say 4 ⟗ 5 14:22
camelia 9
moritz m: sub infix:<⟗>($x, $y) {$x + $y }; say 4 ⟗ 5
camelia 9
moritz ah, so X already does what you want, great
ecocode[m] yeah 14:23
is X lazy ?
I think so, since it generates a sequence.. right ?
hmmm... nope it is not lazy... tested with `@a = 1..100 X 1..100 X 1..1000; say @a[^5]` takes forever 14:39
ugexe m: my $a := 1..100 X 1..100 X 1..1000; say $a[^5] 15:00
camelia ((1 1 1) (1 1 2) (1 1 3) (1 1 4) (1 1 5))
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ecocode[m] ugexe: awesome ! thanks ! 15:02
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Anton Antonov I apologize for these ignorant questions: [1] Is the the blog/site deathbyperl6.com developed/maintained by Nick Logan? [2] Is Nick Logan also ugexe? [3] Is Tony O'Dell publishing Raku packages under user name tony-o ? 17:26
ugexe yes to all of those 17:27
Anton Antonov I assume the answers to all these questions is "yes", but when writing references it is a good idea to double check. 17:28
@ugexe Thanks!
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gfldex tbrowder: please note: github.com/rakudo/rakudo/issues/4942 17:47
tbrowder gfldex: thanks for showing how to use the exported term, and for creating the issue. think the new AST branch can make it work? 17:51
gfldex I thing nobody tried to export a term before. 17:53
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Xliff Has anyone here heard of FluidSynth? 19:01
perryprog Yeah 19:02
Though the context I know about it is from playing Doom I and II 19:03
tbrowder gfldex: just a thought, maybe there’s a unicode char that looks like an arabic digit but really isn’t that could fake the symbol for the constant
gfldex Rakudo knows all the numbers, no matter the language. 19:04
tbrowder m: constant iipi = pi*2 19:05
camelia ( no output )
gfldex m: say ١ + ٢; 19:06
camelia 3
tbrowder m: constant ivpi = 4*pi 19:07
camelia ( no output )
gfldex m: say Ⅰ+Ⅱ;
camelia 3
tbrowder m: constant ipi = pi; say ipi 19:08
camelia 3.141592653589793
Xliff perryprog: I have basic binds for Raku. I'm looking for sample code from other languages that I can port. Have any idea where I can look for something like that? 19:14
perryprog hmm
Xliff, github.com/coelckers/ZMusic might have something 19:15
tbrowder m: say “c\[109]” 19:27
camelia c[109]
tbrowder m: say “\c[109]” 19:29
camelia m
tbrowder m: say “\c[4,109]” 19:30
camelia m
tbrowder m: say “\c[109,110]” 19:31
camelia mn
tbrowder m: my $a = \c[109,110]; say $a 19:32
camelia ===SORRY!=== Error while compiling <tmp>
Undeclared routine:
c used at line 1
tbrowder m: my $a = “\c[109,110]”; say $a 19:33
camelia mn
tbrowder m: constant “\c[109,110]” = pi; say mn 19:35
camelia ===SORRY!=== Error while compiling <tmp>
Missing initializer on constant declaration
at <tmp>:1
------> constant⏏ “\c[109,110]” = pi; say mn
Xliff github.com/Xliff/raku-FluidSynth 19:53
perryprog: Thanks!
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coleman Does the middle CircleCI badge icon look broken for anyone else? The URL is valid for me, though. github.com/Raku/doc#official-docum...on-of-raku 20:49
perryprog Doesn't load for me either; the URL for the image is a 404 20:57
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Anton Antonov It looks like 360.zef.pm/index.json has only author IDs that start with "zef", e.g. "zef:Altai-man", "zef:amano.kenji", ... Is there a JSON file with other non-zef-prefixed author IDs? 21:07
Xliff What does this error mean:
===SORRY!=== Error while compiling /home/cbwood/Projects/p6-GtkPlus/lib/GTK/Box.pm6 (GTK::Box)
New type Stash for CompUnit::DependencySpecification is not a mixin type
jdv anyone else see something like this?: Cannot find method 'is_dispatcher' on object of type BOOTCode 21:21
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jdv m: role A {}; A.new ~~ A:D; 21:33
camelia ===SORRY!===
Cannot find method 'is_dispatcher' on object of type BOOTCode
jdv i don't think that used to happen... 21:34
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jdv Anton: they are in a repo that zef looks at somewhere 21:47
probably here - github.com/ugexe/Perl6-ecosystems 21:48
vrurg: i'd guess you'd know the most about the thing i tripped on 21:50
s/role/class/ and its fine so roley or something...
Anton Antonov @jdv Thank you! 21:54
vrurg jdv: Yes, it's my "baby". :) Optimizer stuff. 21:58
jdv the ll exec looked beyond me 21:59
should i log a bug or is that known or what do you think?
vrurg jdv: It's about to be fixed now. 22:03
Pretty stupid bug as one branch is testing for a method availability whereas another branch of the same condition doesn't. 22:04
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jdv oh ok. thanks! 22:30
no rush. i can deal... 22:31
vrurg jdv: github.com/rakudo/rakudo/pull/4944 – as soon as it's all green. 22:32
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