Commit | Line | Data |
8b978dd5 |
1 | |
2 | package Class::MOP::Method; |
3 | |
4 | use strict; |
5 | use warnings; |
6 | |
2eb717d5 |
7 | use Carp 'confess'; |
aa448b16 |
8 | use Scalar::Util 'reftype', 'blessed'; |
de19f115 |
9 | use B 'svref_2object'; |
2eb717d5 |
10 | |
de19f115 |
11 | our $VERSION = '0.02'; |
12 | |
13 | # introspection |
2eb717d5 |
14 | |
727919c5 |
15 | sub meta { |
16 | require Class::MOP::Class; |
aa448b16 |
17 | Class::MOP::Class->initialize(blessed($_[0]) || $_[0]); |
727919c5 |
18 | } |
2eb717d5 |
19 | |
de19f115 |
20 | # construction |
21 | |
a4258ffd |
22 | sub wrap { |
2eb717d5 |
23 | my $class = shift; |
24 | my $code = shift; |
ee5e71d4 |
25 | ('CODE' eq (reftype($code) || '')) |
de19f115 |
26 | || confess "You must supply a CODE reference to bless"; |
27 | bless $code => blessed($class) || $class; |
28 | } |
29 | |
de19f115 |
30 | # informational |
31 | |
32 | sub package_name { |
33 | my $code = shift; |
34 | (blessed($code)) |
35 | || confess "Can only ask the package name of a blessed CODE"; |
36 | svref_2object($code)->GV->STASH->NAME; |
37 | } |
38 | |
39 | sub name { |
40 | my $code = shift; |
41 | (blessed($code)) |
42 | || confess "Can only ask the package name of a blessed CODE"; |
43 | svref_2object($code)->GV->NAME; |
2eb717d5 |
44 | } |
de19f115 |
45 | |
96ceced8 |
46 | sub fully_qualified_name { |
47 | my $code = shift; |
48 | (blessed($code)) |
49 | || confess "Can only ask the package name of a blessed CODE"; |
50 | $code->package_name . '::' . $code->name; |
51 | } |
52 | |
ddc8edba |
53 | package Class::MOP::Method::Wrapped; |
54 | |
55 | use strict; |
56 | use warnings; |
57 | |
58 | use Carp 'confess'; |
59 | use Scalar::Util 'reftype', 'blessed'; |
96ceced8 |
60 | use Sub::Name 'subname'; |
ddc8edba |
61 | |
62 | our $VERSION = '0.01'; |
63 | |
64 | our @ISA = ('Class::MOP::Method'); |
65 | |
96ceced8 |
66 | # NOTE: |
67 | # this ugly beast is the result of trying |
68 | # to micro optimize this as much as possible |
69 | # while not completely loosing maintainability. |
70 | # At this point it's "fast enough", after all |
71 | # you can't get something for nothing :) |
72 | my $_build_wrapped_method = sub { |
73 | my $modifier_table = shift; |
74 | my ($before, $after, $around) = ( |
75 | $modifier_table->{before}, |
76 | $modifier_table->{after}, |
77 | $modifier_table->{around}, |
78 | ); |
79 | if (@$before && @$after) { |
80 | $modifier_table->{cache} = sub { |
81 | $_->(@_) for @{$before}; |
82 | my @rval; |
83 | ((defined wantarray) ? |
84 | ((wantarray) ? |
85 | (@rval = $around->{cache}->(@_)) |
86 | : |
87 | ($rval[0] = $around->{cache}->(@_))) |
88 | : |
89 | $around->{cache}->(@_)); |
90 | $_->(@_) for @{$after}; |
91 | return unless defined wantarray; |
92 | return wantarray ? @rval : $rval[0]; |
93 | } |
94 | } |
95 | elsif (@$before && !@$after) { |
96 | $modifier_table->{cache} = sub { |
97 | $_->(@_) for @{$before}; |
98 | return $around->{cache}->(@_); |
99 | } |
100 | } |
101 | elsif (@$after && !@$before) { |
102 | $modifier_table->{cache} = sub { |
103 | my @rval; |
104 | ((defined wantarray) ? |
105 | ((wantarray) ? |
106 | (@rval = $around->{cache}->(@_)) |
107 | : |
108 | ($rval[0] = $around->{cache}->(@_))) |
109 | : |
110 | $around->{cache}->(@_)); |
111 | $_->(@_) for @{$after}; |
112 | return unless defined wantarray; |
113 | return wantarray ? @rval : $rval[0]; |
114 | } |
115 | } |
116 | else { |
117 | $modifier_table->{cache} = $around->{cache}; |
118 | } |
119 | }; |
120 | |
ddc8edba |
121 | my %MODIFIERS; |
122 | |
123 | sub wrap { |
124 | my $class = shift; |
125 | my $code = shift; |
126 | (blessed($code) && $code->isa('Class::MOP::Method')) |
127 | || confess "Can only wrap blessed CODE"; |
128 | my $modifier_table = { |
96ceced8 |
129 | cache => undef, |
ddc8edba |
130 | orig => $code, |
131 | before => [], |
132 | after => [], |
133 | around => { |
134 | cache => $code, |
96ceced8 |
135 | methods => [], |
ddc8edba |
136 | }, |
137 | }; |
96ceced8 |
138 | $_build_wrapped_method->($modifier_table); |
139 | my $method = $class->SUPER::wrap(sub { $modifier_table->{cache}->(@_) }); |
ddc8edba |
140 | $MODIFIERS{$method} = $modifier_table; |
141 | $method; |
142 | } |
143 | |
144 | sub add_before_modifier { |
145 | my $code = shift; |
146 | my $modifier = shift; |
147 | (exists $MODIFIERS{$code}) |
148 | || confess "You must first wrap your method before adding a modifier"; |
149 | (blessed($code)) |
150 | || confess "Can only ask the package name of a blessed CODE"; |
151 | ('CODE' eq (reftype($code) || '')) |
152 | || confess "You must supply a CODE reference for a modifier"; |
153 | unshift @{$MODIFIERS{$code}->{before}} => $modifier; |
96ceced8 |
154 | $_build_wrapped_method->($MODIFIERS{$code}); |
ddc8edba |
155 | } |
156 | |
157 | sub add_after_modifier { |
158 | my $code = shift; |
159 | my $modifier = shift; |
160 | (exists $MODIFIERS{$code}) |
161 | || confess "You must first wrap your method before adding a modifier"; |
162 | (blessed($code)) |
163 | || confess "Can only ask the package name of a blessed CODE"; |
164 | ('CODE' eq (reftype($code) || '')) |
165 | || confess "You must supply a CODE reference for a modifier"; |
166 | push @{$MODIFIERS{$code}->{after}} => $modifier; |
96ceced8 |
167 | $_build_wrapped_method->($MODIFIERS{$code}); |
ddc8edba |
168 | } |
169 | |
170 | { |
96ceced8 |
171 | # NOTE: |
172 | # this is another possible canidate for |
173 | # optimization as well. There is an overhead |
174 | # associated with the currying that, if |
175 | # eliminated might make around modifiers |
176 | # more manageable. |
ddc8edba |
177 | my $compile_around_method = sub {{ |
178 | my $f1 = pop; |
179 | return $f1 unless @_; |
180 | my $f2 = pop; |
181 | push @_, sub { $f2->( $f1, @_ ) }; |
182 | redo; |
183 | }}; |
184 | |
185 | sub add_around_modifier { |
186 | my $code = shift; |
187 | my $modifier = shift; |
188 | (exists $MODIFIERS{$code}) |
189 | || confess "You must first wrap your method before adding a modifier"; |
190 | (blessed($code)) |
191 | || confess "Can only ask the package name of a blessed CODE"; |
192 | ('CODE' eq (reftype($code) || '')) |
193 | || confess "You must supply a CODE reference for a modifier"; |
194 | unshift @{$MODIFIERS{$code}->{around}->{methods}} => $modifier; |
195 | $MODIFIERS{$code}->{around}->{cache} = $compile_around_method->( |
196 | @{$MODIFIERS{$code}->{around}->{methods}}, |
197 | $MODIFIERS{$code}->{orig} |
198 | ); |
96ceced8 |
199 | $_build_wrapped_method->($MODIFIERS{$code}); |
ddc8edba |
200 | } |
201 | } |
202 | |
8b978dd5 |
203 | 1; |
204 | |
205 | __END__ |
206 | |
207 | =pod |
208 | |
209 | =head1 NAME |
210 | |
211 | Class::MOP::Method - Method Meta Object |
212 | |
213 | =head1 SYNOPSIS |
214 | |
fe122940 |
215 | # ... more to come later maybe |
216 | |
8b978dd5 |
217 | =head1 DESCRIPTION |
218 | |
552e3d24 |
219 | The Method Protocol is very small, since methods in Perl 5 are just |
220 | subroutines within the particular package. Basically all we do is to |
fe122940 |
221 | bless the subroutine. |
222 | |
223 | Currently this package is largely unused. Future plans are to provide |
224 | some very simple introspection methods for the methods themselves. |
225 | Suggestions for this are welcome. |
552e3d24 |
226 | |
2eb717d5 |
227 | =head1 METHODS |
228 | |
de19f115 |
229 | =head2 Introspection |
2eb717d5 |
230 | |
de19f115 |
231 | =over 4 |
fe122940 |
232 | |
2eb717d5 |
233 | =item B<meta> |
234 | |
fe122940 |
235 | This will return a B<Class::MOP::Class> instance which is related |
236 | to this class. |
237 | |
2eb717d5 |
238 | =back |
239 | |
de19f115 |
240 | =head2 Construction |
241 | |
242 | =over 4 |
243 | |
a4258ffd |
244 | =item B<wrap (&code)> |
de19f115 |
245 | |
246 | This simply blesses the C<&code> reference passed to it. |
247 | |
248 | =back |
249 | |
250 | =head2 Informational |
251 | |
252 | =over 4 |
253 | |
254 | =item B<name> |
255 | |
256 | =item B<package_name> |
257 | |
96ceced8 |
258 | =item B<fully_qualified_name> |
259 | |
260 | =back |
261 | |
262 | =head1 Class::MOP::Method::Wrapped METHODS |
263 | |
264 | =head2 Construction |
265 | |
266 | =over 4 |
267 | |
268 | =item B<wrap (&code)> |
269 | |
270 | This simply blesses the C<&code> reference passed to it. |
271 | |
de19f115 |
272 | =back |
273 | |
ee5e71d4 |
274 | =head2 Modifiers |
275 | |
276 | =over 4 |
de19f115 |
277 | |
ee5e71d4 |
278 | =item B<add_before_modifier ($code)> |
de19f115 |
279 | |
ee5e71d4 |
280 | =item B<add_after_modifier ($code)> |
281 | |
282 | =item B<add_around_modifier ($code)> |
283 | |
284 | =back |
de19f115 |
285 | |
8b978dd5 |
286 | =head1 AUTHOR |
287 | |
a2e85e6c |
288 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
8b978dd5 |
289 | |
290 | =head1 COPYRIGHT AND LICENSE |
291 | |
292 | Copyright 2006 by Infinity Interactive, Inc. |
293 | |
294 | L<http://www.iinteractive.com> |
295 | |
296 | This library is free software; you can redistribute it and/or modify |
297 | it under the same terms as Perl itself. |
298 | |
299 | =cut |