use Scalar::Util 'blessed';
use Carp 'confess';
-our $VERSION = '0.01';
+our $VERSION = '0.02';
# introspection
# creation ...
sub initialize {
- my ($class, $package) = @_;
- bless { '$:package' => $package } => $class;
+ my $class = shift;
+ my $package_name = shift;
+ # we hand-construct the class
+ # until we can bootstrap it
+ no strict 'refs';
+ return bless {
+ '$:package' => $package_name,
+ '%:namespace' => \%{$package_name . '::'},
+ } => $class;
}
# Attributes
# all these attribute readers will be bootstrapped
# away in the Class::MOP bootstrap section
-sub name { $_[0]->{'$:package'} }
+sub name { $_[0]->{'$:package'} }
+sub namespace { $_[0]->{'%:namespace'} }
+
+# utility methods
+
+{
+ my %SIGIL_MAP = (
+ '$' => 'SCALAR',
+ '@' => 'ARRAY',
+ '%' => 'HASH',
+ '&' => 'CODE',
+ );
+
+ sub _deconstruct_variable_name {
+ my ($self, $variable) = @_;
+
+ (defined $variable)
+ || confess "You must pass a variable name";
+
+ my ($sigil, $name) = ($variable =~ /^(.)(.*)$/);
+
+ (defined $sigil)
+ || confess "The variable name must include a sigil";
+
+ (exists $SIGIL_MAP{$sigil})
+ || confess "I do not recognize that sigil '$sigil'";
+
+ return ($name, $sigil, $SIGIL_MAP{$sigil});
+ }
+}
# Class attributes
-my %SIGIL_MAP = (
- '$' => 'SCALAR',
- '@' => 'ARRAY',
- '%' => 'HASH',
- '&' => 'CODE',
-);
+# ... these functions have to touch the symbol table itself,.. yuk
-sub add_package_variable {
+sub add_package_symbol {
my ($self, $variable, $initial_value) = @_;
-
- (defined $variable)
- || confess "You must pass a variable name";
-
- my ($sigil, $name) = ($variable =~ /^(.)(.*)$/);
-
- (defined $sigil)
- || confess "The variable name must include a sigil";
-
- (exists $SIGIL_MAP{$sigil})
- || confess "I do not recognize that sigil '$sigil'";
-
+
+ my ($name, $sigil, $type) = $self->_deconstruct_variable_name($variable);
+
no strict 'refs';
- no warnings 'misc';
- *{$self->name . '::' . $name} = $initial_value;
+ no warnings 'redefine', 'misc';
+ *{$self->name . '::' . $name} = ref $initial_value ? $initial_value : \$initial_value;
+}
+
+sub remove_package_glob {
+ my ($self, $name) = @_;
+ no strict 'refs';
+ delete ${$self->name . '::'}{$name};
}
-sub has_package_variable {
+# ... these functions deal with stuff on the namespace level
+
+sub has_package_symbol {
my ($self, $variable) = @_;
- (defined $variable)
- || confess "You must pass a variable name";
- my ($sigil, $name) = ($variable =~ /^(.)(.*)$/);
-
- (defined $sigil)
- || confess "The variable name must include a sigil";
-
- (exists $SIGIL_MAP{$sigil})
- || confess "I do not recognize that sigil '$sigil'";
-
- no strict 'refs';
- defined *{$self->name . '::' . $name}{$SIGIL_MAP{$sigil}} ? 1 : 0;
-
+ my ($name, $sigil, $type) = $self->_deconstruct_variable_name($variable);
+
+ return 0 unless exists $self->namespace->{$name};
+ defined *{$self->namespace->{$name}}{$type} ? 1 : 0;
}
-sub get_package_variable {
+sub get_package_symbol {
my ($self, $variable) = @_;
- (defined $variable)
- || confess "You must pass a variable name";
-
- my ($sigil, $name) = ($variable =~ /^(.)(.*)$/);
-
- (defined $sigil)
- || confess "The variable name must include a sigil";
-
- (exists $SIGIL_MAP{$sigil})
- || confess "I do not recognize that sigil '$sigil'";
-
- no strict 'refs';
- return *{$self->name . '::' . $name}{$SIGIL_MAP{$sigil}};
+ my ($name, $sigil, $type) = $self->_deconstruct_variable_name($variable);
+
+ $self->add_package_symbol($variable)
+ unless exists $self->namespace->{$name};
+ return *{$self->namespace->{$name}}{$type};
}
-sub remove_package_variable {
+sub remove_package_symbol {
my ($self, $variable) = @_;
-
- (defined $variable)
- || confess "You must pass a variable name";
-
- my ($sigil, $name) = ($variable =~ /^(.)(.*)$/);
-
- (defined $sigil)
- || confess "The variable name must include a sigil";
-
- (exists $SIGIL_MAP{$sigil})
- || confess "I do not recognize that sigil '$sigil'";
-
- no strict 'refs';
- if ($SIGIL_MAP{$sigil} eq 'SCALAR') {
- undef ${$self->name . '::' . $name};
+
+ my ($name, $sigil, $type) = $self->_deconstruct_variable_name($variable);
+
+ # FIXME:
+ # no doubt this is grossly inefficient and
+ # could be done much easier and faster in XS
+
+ my ($scalar, $array, $hash, $code);
+ if ($type eq 'SCALAR') {
+ $array = $self->get_package_symbol('@' . $name) if $self->has_package_symbol('@' . $name);
+ $hash = $self->get_package_symbol('%' . $name) if $self->has_package_symbol('%' . $name);
+ $code = $self->get_package_symbol('&' . $name) if $self->has_package_symbol('&' . $name);
}
- elsif ($SIGIL_MAP{$sigil} eq 'ARRAY') {
- undef @{$self->name . '::' . $name};
+ elsif ($type eq 'ARRAY') {
+ $scalar = $self->get_package_symbol('$' . $name) if $self->has_package_symbol('$' . $name);
+ $hash = $self->get_package_symbol('%' . $name) if $self->has_package_symbol('%' . $name);
+ $code = $self->get_package_symbol('&' . $name) if $self->has_package_symbol('&' . $name);
}
- elsif ($SIGIL_MAP{$sigil} eq 'HASH') {
- undef %{$self->name . '::' . $name};
+ elsif ($type eq 'HASH') {
+ $scalar = $self->get_package_symbol('$' . $name) if $self->has_package_symbol('$' . $name);
+ $array = $self->get_package_symbol('@' . $name) if $self->has_package_symbol('@' . $name);
+ $code = $self->get_package_symbol('&' . $name) if $self->has_package_symbol('&' . $name);
}
- elsif ($SIGIL_MAP{$sigil} eq 'CODE') {
- undef &{$self->name . '::' . $name};
+ elsif ($type eq 'CODE') {
+ $scalar = $self->get_package_symbol('$' . $name) if $self->has_package_symbol('$' . $name);
+ $array = $self->get_package_symbol('@' . $name) if $self->has_package_symbol('@' . $name);
+ $hash = $self->get_package_symbol('%' . $name) if $self->has_package_symbol('%' . $name);
}
else {
confess "This should never ever ever happen";
}
+
+ $self->remove_package_glob($name);
+
+ $self->add_package_symbol(('$' . $name) => $scalar) if defined $scalar;
+ $self->add_package_symbol(('@' . $name) => $array) if defined $array;
+ $self->add_package_symbol(('%' . $name) => $hash) if defined $hash;
+ $self->add_package_symbol(('&' . $name) => $code) if defined $code;
}
+sub list_all_package_symbols {
+ my ($self) = @_;
+ return keys %{$self->namespace};
+}
1;
=item B<name>
-=item B<add_package_variable>
+=item B<namespace>
+
+=item B<add_package_symbol>
-=item B<get_package_variable>
+=item B<get_package_symbol>
-=item B<has_package_variable>
+=item B<has_package_symbol>
-=item B<remove_package_variable>
+=item B<remove_package_symbol>
+
+=item B<remove_package_glob>
+
+=item B<list_all_package_symbols>
=back
-=head1 AUTHOR
+=head1 AUTHORS
Stevan Little E<lt>stevan@iinteractive.comE<gt>
+Yuval Kogman E<lt>nothingmuch@woobling.comE<gt>
+
=head1 COPYRIGHT AND LICENSE
Copyright 2006 by Infinity Interactive, Inc.