File Coverage

lib/Games/Checkers/DeclareConstant.pm

Criterion	Covered	Total	%
statement	29	321	9.0
branch	5	6	83.3
condition	2	2	100.0
subroutine	6	7	85.7
pod			n/a
total	42	336	12.5

# Games::Checkers, Copyright (C) 1996-2012 Mikhael Goikhman, [e-mail]
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see .

use strict;
use warnings;

package Games::Checkers::DeclareConstant;

## This is a general purpose module, kind of the next level of "use constant;".

# keys are package names, values are hash of constants for the package
use vars qw($registered);
$registered = {};

sub import ($;$$) {
   my $caller = caller;
	unless (exists $registered->{$caller}) {
		no strict 'refs';
		$registered->{$caller} = {};
		*{"${caller}::import"} = sub ($) {
			my $caller2 = caller;
			while (my ($name, $value) = each %{$registered->{$caller}}) {
				local $^W = 0;  # 5.005 still produces redefined warnings...
				eval "*${caller2}::$name = sub () { \$value }";
				die $@ if $@;
			}
		}
	}
	shift;
	my $constants = shift || return;
	$constants = { $constants => shift } unless ref($constants) eq 'HASH';
	$registered->{$caller}->{$_} = $constants->{$_} foreach keys %$constants;
}

1;

__END__