use Scalar::Util 'blessed';
use Carp 'confess';
-our $VERSION = '0.01';
+our $VERSION = '0.07';
+our $AUTHORITY = 'cpan:STEVAN';
+
+use base 'Class::MOP::Object';
# introspection
# creation ...
sub initialize {
- my ($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,
+ # NOTE:
+ # because of issues with the Perl API
+ # to the typeglob in some versions, we
+ # need to just always grab a new
+ # reference to the hash in the accessor.
+ # Ideally we could just store a ref and
+ # it would Just Work, but oh well :\
+ '%!namespace' => \undef,
+ } => $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 {
+ # NOTE:
+ # because of issues with the Perl API
+ # to the typeglob in some versions, we
+ # need to just always grab a new
+ # reference to the hash here. Ideally
+ # we could just store a ref and it would
+ # Just Work, but oh well :\
+ no strict 'refs';
+ \%{$_[0]->name . '::'}
+}
+
+# utility methods
+
+{
+ my %SIGIL_MAP = (
+ '$' => '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 = (
- '$' => 'SCALAR',
- '@' => 'ARRAY',
- '%' => 'HASH',
- '&' => 'CODE',
-);
+# ... these functions have to touch the symbol table itself,.. yuk
sub add_package_symbol {
my ($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 . '::'}{$name};
}
+# ... these functions deal with stuff on the namespace level
+
sub has_package_symbol {
my ($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 '$sigil'";
+ my ($name, $sigil, $type) = $self->_deconstruct_variable_name($variable);
- no strict 'refs';
- defined *{$self->name . '::' . $name}{$SIGIL_MAP{$sigil}} ? 1 : 0;
+ return 0 unless exists $self->namespace->{$name};
+ # FIXME:
+ # For some really stupid reason
+ # a typeglob will have a default
+ # value of \undef in the SCALAR
+ # slot, so we need to work around
+ # this. Which of course means that
+ # if you put \undef in your scalar
+ # then this is broken.
+
+ if (ref($self->namespace->{$name}) eq 'SCALAR') {
+ return ($type eq 'CODE' ? 1 : 0);
+ }
+ elsif ($type eq 'SCALAR') {
+ my $val = *{$self->namespace->{$name}}{$type};
+ return defined(${$val}) ? 1 : 0;
+ }
+ else {
+ defined(*{$self->namespace->{$name}}{$type}) ? 1 : 0;
+ }
}
sub get_package_symbol {
my ($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};
+
+ if (ref($self->namespace->{$name}) eq 'SCALAR') {
+ if ($type eq 'CODE') {
+ no strict 'refs';
+ return \&{$self->name.'::'.$name};
+ }
+ else {
+ return undef;
+ }
+ }
+ else {
+ return *{$self->namespace->{$name}}{$type};
+ }
}
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, $type_filter) = @_;
+ return keys %{$self->namespace} unless defined $type_filter;
+ # NOTE:
+ # or we can filter based on
+ # type (SCALAR|ARRAY|HASH|CODE)
+ my $namespace = $self->namespace;
+ return grep {
+ (ref($namespace->{$_})
+ ? (ref($namespace->{$_}) eq 'SCALAR' && $type_filter eq 'CODE')
+ : (ref(\$namespace->{$_}) eq 'GLOB'
+ && defined(*{$namespace->{$_}}{$type_filter})));
+ } keys %{$namespace};
}
1;
=item B<meta>
-=item B<initialize>
+=item B<initialize ($package_name)>
=item B<name>
-=item B<add_package_symbol>
+This is a read-only attribute which returns the package name for the
+given instance.
+
+=item B<namespace>
+
+This returns a HASH reference to the symbol table. The keys of the
+HASH are the symbol names, and the values are typeglob references.
+
+=item B<add_package_symbol ($variable_name, ?$initial_value)>
+
+Given a C<$variable_name>, which must contain a leading sigil, this
+method will create that variable within the package which houses the
+class. It also takes an optional C<$initial_value>, which must be a
+reference of the same type as the sigil of the C<$variable_name>
+implies.
+
+=item B<get_package_symbol ($variable_name)>
+
+This will return a reference to the package variable in
+C<$variable_name>.
+
+=item B<has_package_symbol ($variable_name)>
+
+Returns true (C<1>) if there is a package variable defined for
+C<$variable_name>, and false (C<0>) otherwise.
+
+=item B<remove_package_symbol ($variable_name)>
+
+This will attempt to remove the package variable at C<$variable_name>.
+
+=item B<remove_package_glob ($glob_name)>
+
+This will attempt to remove the entire typeglob associated with
+C<$glob_name> from the package.
-=item B<get_package_symbol>
+=item B<list_all_package_symbols (?$type_filter)>
-=item B<has_package_symbol>
+This will list all the glob names associated with the current package.
+By inspecting the globs returned you can discern all the variables in
+the package.
-=item B<remove_package_symbol>
+By passing a C<$type_filter>, you can limit the list to only those
+which match the filter (either SCALAR, ARRAY, HASH or CODE).
=back
-=head1 AUTHOR
+=head1 AUTHORS
Stevan Little E<lt>stevan@iinteractive.comE<gt>
=head1 COPYRIGHT AND LICENSE
-Copyright 2006 by Infinity Interactive, Inc.
+Copyright 2006, 2007 by Infinity Interactive, Inc.
L<http://www.iinteractive.com>
This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.
-=cut
\ No newline at end of file
+=cut
projects / gitmo/Class-MOP.git / blobdiff