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Re^7: Can't Reference a Sub by Variable when using Strict

by broquaint (Abbot)
on Oct 04, 2004 at 14:10 UTC ( #396240=note: print w/ replies, xml ) Need Help??


in reply to Re^6: Can't Reference a Sub by Variable when using Strict
in thread Can't Reference a Sub by Variable when using Strict

No problems :) All I did was grok the symbol table for the name of the glob, whereas Symbol's qualify_to_ref simply uses perl's symbolic lookup

use strict; { package Foo; use warnings; use warnings::register; sub foo { print "Foo!\n" }; sub import { my $cur = shift; my $dest = caller; for my $g (grep $cur->can($_), @_) { warnings::warnif("sub '$g' already exists in $dest") and next if $dest->can($g); my($dest, $src) = map qualify_to_ref("$_\::$g"), $dest, $cur; *$dest = *$src; } } # This is what we need from Symbol to provide the qualify_to_ref fun +ction my %global = map {$_ => 1} qw(ARGV ARGVOUT ENV INC SIG STDERR STDIN +STDOUT); sub qualify ($;$) { my ($name) = @_; if (!ref($name) && index($name, '::') == -1 && index($name, "'") + == -1) { my $pkg; # Global names: special character, "^x", or other. if ($name =~ /^([^a-z])|(\^[a-z])$/i || $global{$name}) { $pkg = "main"; } else { $pkg = (@_ > 1) ? $_[1] : caller; } $name = $pkg . "::" . $name; } $name; } sub qualify_to_ref ($;$) { my @pkgs = split '::', qualify $_[0], @_ > 1 ? $_[1] : caller; my $tbl = \%main::; $tbl = $tbl->{"$_\::"} for @pkgs[0 .. $#pkgs - 1]; return \$tbl->{$pkgs[-1]}; } } Foo->import('foo'); foo(); __output__ Foo!
HTH

_________
broquaint


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