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Re^4: Perl allows package names consisting entirely of colons

by tobyink (Abbot)
on Nov 27, 2012 at 16:30 UTC ( #1005879=note: print w/replies, xml ) Need Help??


in reply to Re^3: Perl allows package names consisting entirely of colons
in thread Perl allows package names consisting entirely of colons

"why disallow it?"

I never meant to imply that it should be disallowed. I was just expressing surprise that it is not disallowed, given that Perl does place limits on what tokens may appear in a package declaration.

Why disallow package 123 and package 123:: but allow package ::123? The tokens allowed to follow package are have interesting but seemingly arbitrary restrictions, which have nothing to do with what names are actually usable for naming functions, variables, etc...

use 5.010; use strict qw( vars subs ); use warnings; # Package name contains whitespace; sub name begins with leading colon +. *{"123 :::x"} = sub { say "hello" }; # Yet it can be called. &{"123 :::x"};
perl -E'sub Monkey::do{say$_,for@_,do{($monkey=[caller(0)]->[3])=~s{::}{ }and$monkey}}"Monkey say"->Monkey::do'

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[Tux]: None work for me. My dead key is AltGr (right Alt)
[Tux]: And I just tested, neither do other Tk apps :) (95% of my Tk Apps is either just monitoring (no input) or input of just numbers). Something to investigate then
[choroba]: Maybe something like this?
[choroba]: I vaguely remember we had problems with dead keys in Tk at $work - 2, but I forgot all the details
[choroba]: but it was worse on MSWin than on Linux
[choroba]: (and OSX didn't exist yet)
[choroba]: Also, I'd try starting the App with the US layout and switch to the dead keys layout later

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