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package Graph::Attribute;
use strict;
sub _F () { 0 }
sub _COMPAT02 () { 0x00000001 }
sub import {
my $package = shift;
my %attr = @_;
my $caller = caller(0);
if (exists $attr{array}) {
my $i = $attr{array};
no strict 'refs';
*{"${caller}::_get_attributes"} = sub { $_[0]->[ $i ] };
*{"${caller}::_set_attributes"} =
sub { $_[0]->[ $i ] ||= { };
$_[0]->[ $i ] = $_[1] if @_ == 2;
$_[0]->[ $i ] };
*{"${caller}::_has_attributes"} = sub { defined $_[0]->[ $i ] };
*{"${caller}::_delete_attributes"} = sub { undef $_[0]->[ $i ]; 1 };
} elsif (exists $attr{hash}) {
my $k = $attr{hash};
no strict 'refs';
*{"${caller}::_get_attributes"} = sub { $_[0]->{ $k } };
*{"${caller}::_set_attributes"} =
sub { $_[0]->{ $k } ||= { };
$_[0]->{ $k } = $_[1] if @_ == 2;
$_[0]->{ $k } };
*{"${caller}::_has_attributes"} = sub { defined $_[0]->{ $k } };
*{"${caller}::_delete_attributes"} = sub { delete $_[0]->{ $k } };
} else {
die "Graph::Attribute::import($package @_) caller $caller\n";
}
my @api = qw(get_attribute
get_attributes
set_attribute
set_attributes
has_attribute
has_attributes
delete_attribute
delete_attributes
get_attribute_names
get_attribute_values);
if (exists $attr{map}) {
my $map = $attr{map};
for my $api (@api) {
my ($first, $rest) = ($api =~ /^(\w+?)_(.+)/);
no strict 'refs';
*{"${caller}::${first}_${map}_${rest}"} = \&$api;
}
}
}
sub set_attribute {
my $g = shift;
my $v = pop;
my $a = pop;
my $p = $g->_set_attributes;
$p->{ $a } = $v;
return 1;
}
sub set_attributes {
my $g = shift;
my $a = pop;
my $p = $g->_set_attributes( $a );
return 1;
}
sub has_attribute {
my $g = shift;
my $a = pop;
my $p = $g->_get_attributes;
$p ? exists $p->{ $a } : 0;
}
sub has_attributes {
my $g = shift;
$g->_get_attributes ? 1 : 0;
}
sub get_attribute {
my $g = shift;
my $a = pop;
my $p = $g->_get_attributes;
$p ? $p->{ $a } : undef;
}
sub delete_attribute {
my $g = shift;
my $a = pop;
my $p = $g->_get_attributes;
if (defined $p) {
delete $p->{ $a };
return 1;
} else {
return 0;
}
}
sub delete_attributes {
my $g = shift;
if ($g->_has_attributes) {
$g->_delete_attributes;
return 1;
} else {
return 0;
}
}
sub get_attribute_names {
my $g = shift;
my $p = $g->_get_attributes;
defined $p ? keys %{ $p } : ( );
}
sub get_attribute_values {
my $g = shift;
my $p = $g->_get_attributes;
defined $p ? values %{ $p } : ( );
}
sub get_attributes {
my $g = shift;
my $a = $g->_get_attributes;
($g->[ _F ] & _COMPAT02) ? (defined $a ? %{ $a } : ()) : $a;
}
1;
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