#
# Copyright (c) 2013-2015 Christian Jaeger, copying@christianjaeger.ch
#
# This is free software, offered under either the same terms as perl 5
# or the terms of the Artistic License version 2 or the terms of the
# MIT License (Expat version). See the file COPYING.md that came
# bundled with this file.
#

=head1 NAME

Chj::NamespaceClean

=head1 SYNOPSIS

=head1 DESCRIPTION

=head1 SEE ALSO

L<Chj::NamespaceCleanAbove>, L<FP::Struct>

=head1 NOTE

This is alpha software! Read the status section in the package README
or on the L<website|http://functional-perl.org/>.

=cut


package Chj::NamespaceClean;
@ISA="Exporter"; require Exporter;
@EXPORT=qw(package_keys package_delete);
@EXPORT_OK=qw();
%EXPORT_TAGS=(all=>[@EXPORT,@EXPORT_OK]);

use strict; use warnings; use warnings FATAL => 'uninitialized';


sub package_keys {
    my ($package)=@_;
    no strict 'refs';
    [
     map {
         if (my $c= *{"${package}::$_"}{CODE}) {
             [$_, $c]
         } else {
             ()
         }
     }
     keys %{$package."::"}
    ]
}

my @slotnames= qw(SCALAR HASH ARRAY IO);

sub package_delete {
    my ($package,$keys)=@_;
    #warn "package_delete '$package'";
    no strict 'refs';
    for (@$keys) {
        my ($key,$val)= @$_;
        no warnings 'once';
        my $val2= *{"${package}::$key"}{CODE};
        # check val to be equal so that it will work with Chj::ruse
        if ($val2 and $val == $val2) {
            #warn "deleting ${package}::$key ($val)";
            my @v= map { *{"${package}::$key"}{$_} } @slotnames;
            delete ${$package."::"}{$key};
            for (@v) {
                *{"${package}::$key"}= $_ if defined $_
            }
        }
    }
}

# sub package_wipe {
#     my ($package)=@_;
#     package_delete $package, package_keys $package
# }


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