use warnings;
use Carp 'confess';
-use Scalar::Util 'reftype';
+use Scalar::Util 'reftype', 'blessed';
+use B 'svref_2object';
-use Class::MOP::Class;
+our $VERSION = '0.04';
+our $AUTHORITY = 'cpan:STEVAN';
-our $VERSION = '0.01';
+use base 'Class::MOP::Object';
-sub meta { Class::MOP::Class->initialize($_[0]) }
+# NOTE:
+# if poked in the right way,
+# they should act like CODE refs.
+use overload '&{}' => sub { $_[0]->{body} }, fallback => 1;
+
+# introspection
+
+sub meta {
+ require Class::MOP::Class;
+ Class::MOP::Class->initialize(blessed($_[0]) || $_[0]);
+}
+
+# construction
sub wrap {
my $class = shift;
my $code = shift;
-
- (reftype($code) && reftype($code) eq 'CODE')
- || confess "You must supply a CODE reference to wrap";
-
- bless $code => $class;
+ ('CODE' eq (reftype($code) || ''))
+ || confess "You must supply a CODE reference to bless, not (" . ($code || 'undef') . ")";
+ bless {
+ body => $code
+ } => blessed($class) || $class;
+}
+
+## accessors
+
+sub body { (shift)->{body} }
+
+# TODO - add associated_class
+
+# informational
+
+# NOTE:
+# this may not be the same name
+# as the class you got it from
+# This gets the package stash name
+# associated with the actual CODE-ref
+sub package_name {
+ my $code = (shift)->{body};
+ svref_2object($code)->GV->STASH->NAME;
}
-
+
+# NOTE:
+# this may not be the same name
+# as the method name it is stored
+# with. This gets the name associated
+# with the actual CODE-ref
+sub name {
+ my $code = (shift)->{body};
+ svref_2object($code)->GV->NAME;
+}
+
+sub fully_qualified_name {
+ my $code = shift;
+ $code->package_name . '::' . $code->name;
+}
+
+package Class::MOP::Method::Wrapped;
+
+use strict;
+use warnings;
+
+use Carp 'confess';
+use Scalar::Util 'reftype', 'blessed';
+use Sub::Name 'subname';
+
+our $VERSION = '0.02';
+our $AUTHORITY = 'cpan:STEVAN';
+
+use base 'Class::MOP::Method';
+
+# NOTE:
+# this ugly beast is the result of trying
+# to micro optimize this as much as possible
+# while not completely loosing maintainability.
+# At this point it's "fast enough", after all
+# you can't get something for nothing :)
+my $_build_wrapped_method = sub {
+ my $modifier_table = shift;
+ my ($before, $after, $around) = (
+ $modifier_table->{before},
+ $modifier_table->{after},
+ $modifier_table->{around},
+ );
+ if (@$before && @$after) {
+ $modifier_table->{cache} = sub {
+ $_->(@_) for @{$before};
+ my @rval;
+ ((defined wantarray) ?
+ ((wantarray) ?
+ (@rval = $around->{cache}->(@_))
+ :
+ ($rval[0] = $around->{cache}->(@_)))
+ :
+ $around->{cache}->(@_));
+ $_->(@_) for @{$after};
+ return unless defined wantarray;
+ return wantarray ? @rval : $rval[0];
+ }
+ }
+ elsif (@$before && !@$after) {
+ $modifier_table->{cache} = sub {
+ $_->(@_) for @{$before};
+ return $around->{cache}->(@_);
+ }
+ }
+ elsif (@$after && !@$before) {
+ $modifier_table->{cache} = sub {
+ my @rval;
+ ((defined wantarray) ?
+ ((wantarray) ?
+ (@rval = $around->{cache}->(@_))
+ :
+ ($rval[0] = $around->{cache}->(@_)))
+ :
+ $around->{cache}->(@_));
+ $_->(@_) for @{$after};
+ return unless defined wantarray;
+ return wantarray ? @rval : $rval[0];
+ }
+ }
+ else {
+ $modifier_table->{cache} = $around->{cache};
+ }
+};
+
+sub wrap {
+ my $class = shift;
+ my $code = shift;
+ (blessed($code) && $code->isa('Class::MOP::Method'))
+ || confess "Can only wrap blessed CODE";
+ my $modifier_table = {
+ cache => undef,
+ orig => $code,
+ before => [],
+ after => [],
+ around => {
+ cache => $code->body,
+ methods => [],
+ },
+ };
+ $_build_wrapped_method->($modifier_table);
+ my $method = $class->SUPER::wrap(sub { $modifier_table->{cache}->(@_) });
+ $method->{modifier_table} = $modifier_table;
+ $method;
+}
+
+sub get_original_method {
+ my $code = shift;
+ $code->{modifier_table}->{orig};
+}
+
+sub add_before_modifier {
+ my $code = shift;
+ my $modifier = shift;
+ unshift @{$code->{modifier_table}->{before}} => $modifier;
+ $_build_wrapped_method->($code->{modifier_table});
+}
+
+sub add_after_modifier {
+ my $code = shift;
+ my $modifier = shift;
+ push @{$code->{modifier_table}->{after}} => $modifier;
+ $_build_wrapped_method->($code->{modifier_table});
+}
+
+{
+ # NOTE:
+ # this is another possible canidate for
+ # optimization as well. There is an overhead
+ # associated with the currying that, if
+ # eliminated might make around modifiers
+ # more manageable.
+ my $compile_around_method = sub {{
+ my $f1 = pop;
+ return $f1 unless @_;
+ my $f2 = pop;
+ push @_, sub { $f2->( $f1, @_ ) };
+ redo;
+ }};
+
+ sub add_around_modifier {
+ my $code = shift;
+ my $modifier = shift;
+ unshift @{$code->{modifier_table}->{around}->{methods}} => $modifier;
+ $code->{modifier_table}->{around}->{cache} = $compile_around_method->(
+ @{$code->{modifier_table}->{around}->{methods}},
+ $code->{modifier_table}->{orig}->body
+ );
+ $_build_wrapped_method->($code->{modifier_table});
+ }
+}
+
1;
__END__
=head1 SYNOPSIS
+ # ... more to come later maybe
+
=head1 DESCRIPTION
The Method Protocol is very small, since methods in Perl 5 are just
-subroutines within the particular package. Basically all we do is to
-bless the subroutine and provide some very simple introspection
-methods for it.
+subroutines within the particular package. We provide a very basic
+introspection interface.
+
+This also contains the Class::MOP::Method::Wrapped subclass, which
+provides the features for before, after and around method modifiers.
=head1 METHODS
+=head2 Introspection
+
+=over 4
+
+=item B<meta>
+
+This will return a B<Class::MOP::Class> instance which is related
+to this class.
+
+=back
+
+=head2 Construction
+
=over 4
=item B<wrap (&code)>
-=item B<meta>
+=back
+
+=head2 Informational
+
+=over 4
+
+=item B<body>
+
+=item B<name>
+
+=item B<package_name>
+
+=item B<fully_qualified_name>
=back
-=head1 AUTHOR
+=head1 Class::MOP::Method::Wrapped METHODS
-Stevan Little E<gt>stevan@iinteractive.comE<lt>
+=head2 Construction
+
+=over 4
+
+=item B<wrap (&code)>
+
+=item B<get_original_method>
+
+=back
+
+=head2 Modifiers
+
+=over 4
+
+=item B<add_before_modifier ($code)>
+
+=item B<add_after_modifier ($code)>
+
+=item B<add_around_modifier ($code)>
+
+=back
+
+=head1 AUTHORS
+
+Stevan Little E<lt>stevan@iinteractive.comE<gt>
+
+Yuval Kogman E<lt>nothingmuch@woobling.comE<gt>
=head1 COPYRIGHT AND LICENSE
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