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package PerlIO;
# Map layer name to package that defines it
my %alias = (encoding => 'Encode');
sub import
{
my $class = shift;
while (@_)
{
my $layer = shift;
if (exists $alias{$layer})
{
$layer = $alias{$layer}
}
else
{
$layer = "${class}::$layer";
}
eval "require $layer";
warn $@ if $@;
}
}
1;
__END__
=head1 NAME
PerlIO - On demand loader for PerlIO::* name space
=head1 SYNOPSIS
open($fh,">:foo",...)
=head1 DESCRIPTION
When an undefined layer 'foo' is encountered in an C<open> or C<binmode> layer
specification then C code performs the equivalent of:
use PerlIO 'foo';
The perl code in PerlIO.pm then attempts to locate a layer by doing
require PerlIO::foo;
Otherwise the C<PerlIO> package is a place holder for additional PerLIO related
functions.
=cut
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