1 package Catalyst::Action;
5 Catalyst::Action - Catalyst Action
9 <form action="[%c.uri_for(c.action)%]">
11 $c->forward( $action->private_path );
15 This class represents a Catalyst Action. You can access the object for the
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.
23 use Scalar::Util 'looks_like_number';
24 use Moose::Util::TypeConstraints ();
25 with 'MooseX::Emulate::Class::Accessor::Fast';
26 use namespace::clean -except => 'meta';
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');
35 reader => 'private_path',
39 default => sub { '/'.shift->reverse },
42 has number_of_args => (
48 builder=>'_build_number_of_args');
50 sub _build_number_of_args {
52 if( ! exists $self->attributes->{Args} ) {
53 # When 'Args' does not exist, that means we want 'any number of args'.
55 } elsif(!defined($self->attributes->{Args}[0])) {
56 # When its 'Args' that internal cue for 'unlimited'
59 scalar(@{$self->attributes->{Args}}) == 1 &&
60 looks_like_number($self->attributes->{Args}[0])
62 # 'Old school' numberd args (is allowed to be undef as well)
63 return $self->attributes->{Args}[0];
65 # New hotness named arg constraints
66 return $self->number_of_args_constraints;
70 sub normalized_arg_number {
71 return defined($_[0]->number_of_args) ? $_[0]->number_of_args : ~0;
74 has args_constraints => (
81 builder=>'_build_args_constraints',
83 has_args_constraints => 'count',
84 number_of_args_constraints => 'count',
87 sub _build_args_constraints {
89 my @arg_protos = @{$self->attributes->{Args}||[]};
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
97 scalar(@arg_protos) == 1 &&
98 looks_like_number($arg_protos[0])
103 map { Moose::Util::TypeConstraints::find_or_parse_type_constraint($_) || die "$_ is not a constraint!" }
112 # Stringify to reverse for debug output etc.
113 q{""} => sub { shift->{reverse} },
115 # Codulate to execute to invoke the encapsulated action coderef
116 '&{}' => sub { my $self = shift; sub { $self->execute(@_); }; },
118 # Make general $stuff still work
123 no warnings 'recursion';
125 sub dispatch { # Execute ourselves against a context
126 my ( $self, $c ) = @_;
127 return $c->execute( $self->class, $self );
136 my ( $self, $c ) = @_;
138 # If infinite args, we always match
139 return 1 if $self->normalized_arg_number == ~0;
141 # There there are arg constraints, we must see to it that the constraints
142 # check positive for each arg in the list.
143 if($self->has_args_constraints) {
144 # If there is only one type constraint, and its a Ref or subtype of Ref,
145 # That means we expect a reference, so use the full args arrayref.
147 $self->number_of_args_constraints == 1 &&
148 $self->args_constraints->[0]->is_a_type_of('Ref')
150 return $self->args_constraints->[0]->check($c->req->args);
152 for my $i($#{ $c->req->args }) {
153 $self->args_constraints->[$i]->check($c->req->args->[$i]) || return 0;
158 # Otherwise, we just need to match the number of args.
159 return scalar( @{ $c->req->args } ) == $self->normalized_arg_number;
163 sub match_captures { 1 }
167 return $a1->normalized_arg_number <=> $a2->normalized_arg_number;
170 sub number_of_captures {
173 return 0 unless exists $self->attributes->{CaptureArgs};
174 return $self->attributes->{CaptureArgs}[0] || 0;
178 return exists $_[0]->attributes->{Scheme} ? $_[0]->attributes->{Scheme}[0] : undef;
181 sub list_extra_info {
184 Args => $self->attributes->{Args}[0],
185 CaptureArgs => $self->number_of_captures,
189 __PACKAGE__->meta->make_immutable;
199 The sub attributes that are set for this action, like Local, Path, Private
200 and so on. This determines how the action is dispatched to.
204 Returns the name of the component where this action is defined.
205 Derived by calling the L<catalyst_component_name|Catalyst::Component/catalyst_component_name>
206 method on each component.
210 Returns a code reference to this action.
212 =head2 dispatch( $c )
214 Dispatch this action against a context.
216 =head2 execute( $controller, $c, @args )
218 Execute this action's coderef against a given controller with a given
219 context and arguments
223 Check Args attribute, and makes sure number of args matches the setting.
224 Always returns true if Args is omitted.
226 =head2 match_captures ($c, $captures)
228 Can be implemented by action class and action role authors. If the method
229 exists, then it will be called with the request context and an array reference
230 of the captures for this action.
232 Returning true from this method causes the chain match to continue, returning
233 makes the chain not match (and alternate, less preferred chains will be attempted).
238 Compares 2 actions based on the value of the C<Args> attribute, with no C<Args>
239 having the highest precedence.
243 Returns the private namespace this action lives in.
247 Returns the private path for this action.
251 Returns absolute private path for this action. Unlike C<reverse>, the
252 C<private_path> of an action is always suitable for passing to C<forward>.
256 Returns the sub name of this action.
258 =head2 number_of_args
260 Returns the number of args this action expects. This is 0 if the action doesn't
261 take any arguments and undef if it will take any number of arguments.
263 =head2 normalized_arg_number
265 For the purposes of comparison we normalize 'number_of_args' so that if it is
266 undef we mean ~0 (as many args are we can think of).
268 =head2 number_of_captures
270 Returns the number of captures this action expects for L<Chained|Catalyst::DispatchType::Chained> actions.
272 =head2 list_extra_info
274 A HashRef of key-values that an action can provide to a debugging screen
278 Any defined scheme for the action
286 Catalyst Contributors, see Catalyst.pm
290 This library is free software. You can redistribute it and/or modify it under
291 the same terms as Perl itself.