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1 | package Catalyst::Action; |
2 | |
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3 | =head1 NAME |
4 | |
5 | Catalyst::Action - Catalyst Action |
6 | |
7 | =head1 SYNOPSIS |
8 | |
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9 | <form action="[%c.uri_for(c.action)%]"> |
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10 | |
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11 | $c->forward( $action->private_path ); |
12 | |
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13 | =head1 DESCRIPTION |
14 | |
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15 | This class represents a Catalyst Action. You can access the object for the |
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16 | currently dispatched action via $c->action. See the L<Catalyst::Dispatcher> |
17 | for more information on how actions are dispatched. Actions are defined in |
18 | L<Catalyst::Controller> subclasses. |
19 | |
20 | =cut |
21 | |
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22 | use Moose; |
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23 | use Scalar::Util 'looks_like_number'; |
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24 | use Moose::Util::TypeConstraints (); |
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25 | with 'MooseX::Emulate::Class::Accessor::Fast'; |
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26 | use namespace::clean -except => 'meta'; |
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27 | |
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28 | has class => (is => 'rw'); |
29 | has namespace => (is => 'rw'); |
30 | has 'reverse' => (is => 'rw'); |
31 | has attributes => (is => 'rw'); |
32 | has name => (is => 'rw'); |
33 | has code => (is => 'rw'); |
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34 | has private_path => ( |
35 | reader => 'private_path', |
36 | isa => 'Str', |
37 | lazy => 1, |
38 | required => 1, |
39 | default => sub { '/'.shift->reverse }, |
40 | ); |
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41 | |
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42 | has number_of_args => ( |
43 | is=>'ro', |
44 | init_arg=>undef, |
45 | isa=>'Int|Undef', |
46 | required=>1, |
47 | lazy=>1, |
48 | builder=>'_build_number_of_args'); |
49 | |
50 | sub _build_number_of_args { |
51 | my $self = shift; |
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52 | if( ! exists $self->attributes->{Args} ) { |
53 | # When 'Args' does not exist, that means we want 'any number of args'. |
54 | return undef; |
55 | } elsif(!defined($self->attributes->{Args}[0])) { |
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56 | # When its 'Args' that internal cue for 'unlimited' |
57 | return undef; |
4a0218ca |
58 | } elsif( |
59 | scalar(@{$self->attributes->{Args}}) == 1 && |
60 | looks_like_number($self->attributes->{Args}[0]) |
61 | ) { |
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62 | # 'Old school' numberd args (is allowed to be undef as well) |
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63 | return $self->attributes->{Args}[0]; |
64 | } else { |
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65 | # New hotness named arg constraints |
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66 | return $self->number_of_args_constraints; |
67 | } |
68 | } |
69 | |
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70 | sub normalized_arg_number { |
71 | return defined($_[0]->number_of_args) ? $_[0]->number_of_args : ~0; |
72 | } |
73 | |
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74 | has args_constraints => ( |
75 | is=>'ro', |
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76 | init_arg=>undef, |
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77 | traits=>['Array'], |
78 | isa=>'ArrayRef', |
79 | required=>1, |
80 | lazy=>1, |
81 | builder=>'_build_args_constraints', |
82 | handles => { |
83 | has_args_constraints => 'count', |
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84 | number_of_args_constraints => 'count', |
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85 | }); |
86 | |
87 | sub _build_args_constraints { |
88 | my $self = shift; |
89 | my @arg_protos = @{$self->attributes->{Args}||[]}; |
90 | |
91 | return [] unless scalar(@arg_protos); |
92 | # If there is only one arg and it looks like a number |
93 | # we assume its 'classic' and the number is the number of |
94 | # constraints. |
95 | my @args = (); |
96 | if( |
97 | scalar(@arg_protos) == 1 && |
98 | looks_like_number($arg_protos[0]) |
99 | ) { |
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100 | return \@args; |
6d62355b |
101 | } else { |
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102 | @args = |
103 | map { Moose::Util::TypeConstraints::find_or_parse_type_constraint($_) || die "$_ is not a constraint!" } |
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104 | @arg_protos; |
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105 | } |
106 | |
107 | return \@args; |
108 | } |
109 | |
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110 | use overload ( |
111 | |
112 | # Stringify to reverse for debug output etc. |
113 | q{""} => sub { shift->{reverse} }, |
114 | |
115 | # Codulate to execute to invoke the encapsulated action coderef |
116 | '&{}' => sub { my $self = shift; sub { $self->execute(@_); }; }, |
117 | |
118 | # Make general $stuff still work |
119 | fallback => 1, |
120 | |
121 | ); |
122 | |
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123 | no warnings 'recursion'; |
124 | |
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125 | sub dispatch { # Execute ourselves against a context |
126 | my ( $self, $c ) = @_; |
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127 | return $c->execute( $self->class, $self ); |
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128 | } |
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129 | |
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130 | sub execute { |
131 | my $self = shift; |
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132 | $self->code->(@_); |
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133 | } |
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134 | |
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135 | sub match { |
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136 | my ( $self, $c ) = @_; |
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137 | $c->log->debug($self->reverse); |
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138 | |
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139 | # If infinite args, we always match |
140 | return 1 if $self->normalized_arg_number == ~0; |
141 | |
142 | # There there are arg constraints, we must see to it that the constraints |
143 | # check positive for each arg in the list. |
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144 | if($self->has_args_constraints) { |
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145 | # If there is only one type constraint, and its a Ref or subtype of Ref, |
146 | # That means we expect a reference, so use the full args arrayref. |
147 | if( |
148 | $self->number_of_args_constraints == 1 && |
149 | $self->args_constraints->[0]->is_a_type_of('Ref') |
150 | ) { |
151 | return $self->args_constraints->[0]->check($c->req->args); |
152 | } else { |
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153 | for my $i(0..$#{ $c->req->args }) { |
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154 | $self->args_constraints->[$i]->check($c->req->args->[$i]) || return 0; |
155 | } |
156 | return 1; |
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157 | } |
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158 | } else { |
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159 | # Otherwise, we just need to match the number of args. |
160 | return scalar( @{ $c->req->args } ) == $self->normalized_arg_number; |
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161 | } |
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162 | } |
163 | |
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164 | sub match_captures { 1 } |
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165 | |
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166 | sub compare { |
167 | my ($a1, $a2) = @_; |
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168 | return $a1->normalized_arg_number <=> $a2->normalized_arg_number; |
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169 | } |
170 | |
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171 | sub number_of_captures { |
172 | my ( $self ) = @_; |
173 | |
174 | return 0 unless exists $self->attributes->{CaptureArgs}; |
175 | return $self->attributes->{CaptureArgs}[0] || 0; |
176 | } |
177 | |
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178 | sub scheme { |
179 | return exists $_[0]->attributes->{Scheme} ? $_[0]->attributes->{Scheme}[0] : undef; |
180 | } |
181 | |
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182 | sub list_extra_info { |
183 | my $self = shift; |
184 | return { |
185 | Args => $self->attributes->{Args}[0], |
186 | CaptureArgs => $self->number_of_captures, |
187 | } |
188 | } |
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189 | |
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190 | __PACKAGE__->meta->make_immutable; |
191 | |
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192 | 1; |
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193 | |
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194 | __END__ |
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195 | |
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196 | =head1 METHODS |
197 | |
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198 | =head2 attributes |
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199 | |
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200 | The sub attributes that are set for this action, like Local, Path, Private |
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201 | and so on. This determines how the action is dispatched to. |
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202 | |
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203 | =head2 class |
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204 | |
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205 | Returns the name of the component where this action is defined. |
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206 | Derived by calling the L<catalyst_component_name|Catalyst::Component/catalyst_component_name> |
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207 | method on each component. |
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208 | |
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209 | =head2 code |
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210 | |
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211 | Returns a code reference to this action. |
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212 | |
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213 | =head2 dispatch( $c ) |
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214 | |
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215 | Dispatch this action against a context. |
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216 | |
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217 | =head2 execute( $controller, $c, @args ) |
218 | |
219 | Execute this action's coderef against a given controller with a given |
220 | context and arguments |
221 | |
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222 | =head2 match( $c ) |
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223 | |
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224 | Check Args attribute, and makes sure number of args matches the setting. |
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225 | Always returns true if Args is omitted. |
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226 | |
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227 | =head2 match_captures ($c, $captures) |
228 | |
229 | Can be implemented by action class and action role authors. If the method |
230 | exists, then it will be called with the request context and an array reference |
231 | of the captures for this action. |
232 | |
233 | Returning true from this method causes the chain match to continue, returning |
234 | makes the chain not match (and alternate, less preferred chains will be attempted). |
235 | |
236 | |
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237 | =head2 compare |
238 | |
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239 | Compares 2 actions based on the value of the C<Args> attribute, with no C<Args> |
240 | having the highest precedence. |
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241 | |
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242 | =head2 namespace |
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243 | |
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244 | Returns the private namespace this action lives in. |
245 | |
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246 | =head2 reverse |
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247 | |
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248 | Returns the private path for this action. |
249 | |
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250 | =head2 private_path |
251 | |
252 | Returns absolute private path for this action. Unlike C<reverse>, the |
253 | C<private_path> of an action is always suitable for passing to C<forward>. |
254 | |
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255 | =head2 name |
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256 | |
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257 | Returns the sub name of this action. |
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258 | |
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259 | =head2 number_of_args |
260 | |
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261 | Returns the number of args this action expects. This is 0 if the action doesn't |
262 | take any arguments and undef if it will take any number of arguments. |
263 | |
264 | =head2 normalized_arg_number |
265 | |
266 | For the purposes of comparison we normalize 'number_of_args' so that if it is |
267 | undef we mean ~0 (as many args are we can think of). |
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268 | |
269 | =head2 number_of_captures |
270 | |
271 | Returns the number of captures this action expects for L<Chained|Catalyst::DispatchType::Chained> actions. |
272 | |
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273 | =head2 list_extra_info |
274 | |
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275 | A HashRef of key-values that an action can provide to a debugging screen |
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276 | |
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277 | =head2 scheme |
278 | |
279 | Any defined scheme for the action |
280 | |
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281 | =head2 meta |
282 | |
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283 | Provided by Moose. |
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284 | |
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285 | =head1 AUTHORS |
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286 | |
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287 | Catalyst Contributors, see Catalyst.pm |
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288 | |
289 | =head1 COPYRIGHT |
290 | |
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291 | This library is free software. You can redistribute it and/or modify it under |
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292 | the same terms as Perl itself. |
293 | |
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294 | =cut |
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295 | |
296 | |