blob: 02fa01e339f4718a064f9c6fc194c132e0de89e9 [file] [log] [blame]
package attributes;
our $VERSION = 0.29;
@EXPORT_OK = qw(get reftype);
@EXPORT = ();
%EXPORT_TAGS = (ALL => [@EXPORT, @EXPORT_OK]);
use strict;
sub croak {
require Carp;
goto &Carp::croak;
}
sub carp {
require Carp;
goto &Carp::carp;
}
my %deprecated;
$deprecated{CODE} = qr/\A-?(locked)\z/;
$deprecated{ARRAY} = $deprecated{HASH} = $deprecated{SCALAR}
= qr/\A-?(unique)\z/;
my %msg = (
lvalue => 'lvalue attribute applied to already-defined subroutine',
-lvalue => 'lvalue attribute removed from already-defined subroutine',
const => 'Useless use of attribute "const"',
);
sub _modify_attrs_and_deprecate {
my $svtype = shift;
# Now that we've removed handling of locked from the XS code, we need to
# remove it here, else it ends up in @badattrs. (If we do the deprecation in
# XS, we can't control the warning based on *our* caller's lexical settings,
# and the warned line is in this package)
grep {
$deprecated{$svtype} && /$deprecated{$svtype}/ ? do {
require warnings;
warnings::warnif('deprecated', "Attribute \"$1\" is deprecated, " .
"and will disappear in Perl 5.28");
0;
} : $svtype eq 'CODE' && exists $msg{$_} ? do {
require warnings;
warnings::warnif(
'misc',
$msg{$_}
);
0;
} : 1
} _modify_attrs(@_);
}
sub import {
@_ > 2 && ref $_[2] or do {
require Exporter;
goto &Exporter::import;
};
my (undef,$home_stash,$svref,@attrs) = @_;
my $svtype = uc reftype($svref);
my $pkgmeth;
$pkgmeth = UNIVERSAL::can($home_stash, "MODIFY_${svtype}_ATTRIBUTES")
if defined $home_stash && $home_stash ne '';
my @badattrs;
if ($pkgmeth) {
my @pkgattrs = _modify_attrs_and_deprecate($svtype, $svref, @attrs);
@badattrs = $pkgmeth->($home_stash, $svref, @pkgattrs);
if (!@badattrs && @pkgattrs) {
require warnings;
return unless warnings::enabled('reserved');
@pkgattrs = grep { m/\A[[:lower:]]+(?:\z|\()/ } @pkgattrs;
if (@pkgattrs) {
for my $attr (@pkgattrs) {
$attr =~ s/\(.+\z//s;
}
my $s = ((@pkgattrs == 1) ? '' : 's');
carp "$svtype package attribute$s " .
"may clash with future reserved word$s: " .
join(' : ' , @pkgattrs);
}
}
}
else {
@badattrs = _modify_attrs_and_deprecate($svtype, $svref, @attrs);
}
if (@badattrs) {
croak "Invalid $svtype attribute" .
(( @badattrs == 1 ) ? '' : 's') .
": " .
join(' : ', @badattrs);
}
}
sub get ($) {
@_ == 1 && ref $_[0] or
croak 'Usage: '.__PACKAGE__.'::get $ref';
my $svref = shift;
my $svtype = uc reftype($svref);
my $stash = _guess_stash($svref);
$stash = caller unless defined $stash;
my $pkgmeth;
$pkgmeth = UNIVERSAL::can($stash, "FETCH_${svtype}_ATTRIBUTES")
if defined $stash && $stash ne '';
return $pkgmeth ?
(_fetch_attrs($svref), $pkgmeth->($stash, $svref)) :
(_fetch_attrs($svref))
;
}
sub require_version { goto &UNIVERSAL::VERSION }
require XSLoader;
XSLoader::load();
1;
__END__
#The POD goes here