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100 lines
2.2 KiB
Perl
100 lines
2.2 KiB
Perl
package Exporter;
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require 5.006;
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# Be lean.
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#use strict;
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#no strict 'refs';
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our $Debug = 0;
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our $ExportLevel = 0;
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our $Verbose ||= 0;
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our $VERSION = '5.63';
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our (%Cache);
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# Carp 1.05+ does this now for us, but we may be running with an old Carp
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$Carp::Internal{Exporter}++;
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sub as_heavy {
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require Exporter::Heavy;
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# Unfortunately, this does not work if the caller is aliased as *name = \&foo
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# Thus the need to create a lot of identical subroutines
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my $c = (caller(1))[3];
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$c =~ s/.*:://;
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\&{"Exporter::Heavy::heavy_$c"};
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}
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sub export {
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goto &{as_heavy()};
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}
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sub import {
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my $pkg = shift;
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my $callpkg = caller($ExportLevel);
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if ($pkg eq "Exporter" and @_ and $_[0] eq "import") {
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*{$callpkg."::import"} = \&import;
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return;
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}
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# We *need* to treat @{"$pkg\::EXPORT_FAIL"} since Carp uses it :-(
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my($exports, $fail) = (\@{"$pkg\::EXPORT"}, \@{"$pkg\::EXPORT_FAIL"});
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return export $pkg, $callpkg, @_
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if $Verbose or $Debug or @$fail > 1;
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my $export_cache = ($Cache{$pkg} ||= {});
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my $args = @_ or @_ = @$exports;
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local $_;
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if ($args and not %$export_cache) {
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s/^&//, $export_cache->{$_} = 1
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foreach (@$exports, @{"$pkg\::EXPORT_OK"});
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}
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my $heavy;
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# Try very hard not to use {} and hence have to enter scope on the foreach
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# We bomb out of the loop with last as soon as heavy is set.
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if ($args or $fail) {
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($heavy = (/\W/ or $args and not exists $export_cache->{$_}
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or @$fail and $_ eq $fail->[0])) and last
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foreach (@_);
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} else {
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($heavy = /\W/) and last
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foreach (@_);
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}
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return export $pkg, $callpkg, ($args ? @_ : ()) if $heavy;
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local $SIG{__WARN__} =
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sub {require Carp; &Carp::carp};
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# shortcut for the common case of no type character
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*{"$callpkg\::$_"} = \&{"$pkg\::$_"} foreach @_;
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}
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# Default methods
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sub export_fail {
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my $self = shift;
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@_;
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}
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# Unfortunately, caller(1)[3] "does not work" if the caller is aliased as
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# *name = \&foo. Thus the need to create a lot of identical subroutines
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# Otherwise we could have aliased them to export().
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sub export_to_level {
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goto &{as_heavy()};
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}
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sub export_tags {
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goto &{as_heavy()};
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}
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sub export_ok_tags {
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goto &{as_heavy()};
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}
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sub require_version {
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goto &{as_heavy()};
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}
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1;
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__END__
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