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| kueppo | Hi, quick question: how useful are complex identifiers? why should we add pairs to ordinary identifiers? | 19:08 | |
| Like this example from the rakudoc iirc $varname:d<e>:d<c> | 19:10 | ||
| lizmat | I would say, they exist to allow identifiers such as infix:<+> | ||
| and outside of the core, I've never have had a use for them yet | |||
| kueppo | thank you :) | 19:11 | |
| lizmat | you're welcome :-) | 19:12 | |
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| kueppo | Just trying to understand, from Perl5's perspective, a package represents a file with bunch of related subroutines in it and we consider a package to be a module whenever it's used by another module or a program. In Raku, my confusion arise with these two constructs | 20:00 | |
| Package P {} | |||
| Module M {} | |||
| So why does the second one exist and when should I use it if I may ask? | |||
| lizmat | Well, first of all, I think you have your Perl understanding wrong | 20:04 | |
| a package in Perl represents a collection of subroutines in a given namespace | |||
| this *usually* coincides with a single source file, but doesn't have to be | |||
| in Raku, a "package" is basically just a namespace without any bells and whistles | 20:05 | ||
| or any specific meaning | |||
| a "module" is just a namespace without any bells and whistles, but it is common to use that as a collection of subroutines to be exported | 20:06 | ||
| a "class" is a namespace that can have methods | |||
| a "grammar" is a namespace that can have rules, tokens, and regexes | |||
| the "package" is really an internals thing in Raku | 20:07 | ||
| any developer would usually only use class and grammar | |||
| kueppo | okay, I'm trying to understand | ||
| lizmat | and a developer providing a library of subroutines, would use a "module" | 20:08 | |
| m: package Foo { our sub bar() { say "bar" } }; Foo::bar # Perl style | 20:10 | ||
| camelia | bar | ||
| lizmat | m: module Foo { sub bar() is export { say "bar" } }; import Foo; bar # Raku style | 20:11 | |
| camelia | bar | ||
| kueppo | why does it mean by "a package doesn't have an identity"? | 20:14 | |
| *what | 20:15 | ||
| lizmat | where does that say that ? | ||
| kueppo | here docs.raku.org/language/packages | 20:16 | |
| lizmat | I would say s/identity/bells and whistles/ :-) | 20:17 | |
| and the bells and whistles are e.g. a version specification: | 20:18 | ||
| m: package Foo:ver<0.0.1> { }; dd Foo.^ver | |||
| camelia | No such method 'ver' for invocant of type 'Perl6::Metamodel::PackageHOW' in block <unit> at <tmp> line 1 |
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| lizmat | m: module Foo:ver<0.0.1> { }; dd Foo.^ver | ||
| camelia | v0.0.1 | ||
| lizmat | the identity is really the combination of version (:ver), authority (:auth) and api (:api) | 20:19 | |
| kueppo | X) | ||
| ah I see now | 20:20 | ||
| lizmat | m: module Foo:ver<0.0.1>:auth<zef:lizmat>:api<1> { } | ||
| camelia | ( no output ) | ||
| lizmat | would be a full identity | ||
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| kueppo | So if I got it right, can nest grammers, modules, and classes(in any order) into a single file and require or use them anyhow since they are basically namespace? | 20:35 | |
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| Nemokosch | what's the idiomatic way to get the last character of a string? | 22:27 | |
| in fact I might be better off matching against an ending in my particular case but the question still can be relevant | 22:29 | ||
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| also, the documentation of $*COLLATION is rather lacky | 22:48 | ||
| collation-level? Country? Language? | |||
| [13] > $*COLLATION | |||
| collation-level => 85, Country => International, Language => None, primary => 1, secondary => 1, tertiary => 1, quaternary => 1 | |||