1 package Catalyst::Dispatcher;
5 with 'MooseX::Emulate::Class::Accessor::Fast';
7 use Catalyst::Exception;
10 use Catalyst::ActionContainer;
11 use Catalyst::DispatchType::Default;
12 use Catalyst::DispatchType::Index;
14 use Text::SimpleTable;
16 use Tree::Simple::Visitor::FindByPath;
19 # do these belong as package vars or should we build these via a builder method?
20 # See Catalyst-Plugin-Server for them being added to, which should be much less ugly.
22 # Preload these action types
23 our @PRELOAD = qw/Index Path Regex/;
25 # Postload these action types
26 our @POSTLOAD = qw/Default/;
28 # Note - see back-compat methods at end of file.
29 has _tree => (is => 'rw');
30 has _dispatch_types => (is => 'rw', default => sub { [] }, required => 1, lazy => 1);
31 has _registered_dispatch_types => (is => 'rw', default => sub { {} }, required => 1, lazy => 1);
32 has _method_action_class => (is => 'rw', default => 'Catalyst::Action');
33 has _action_hash => (is => 'rw', required => 1, lazy => 1, default => sub { {} });
34 has _container_hash => (is => 'rw', required => 1, lazy => 1, default => sub { {} });
35 has preload_dispatch_types => (is => 'rw', required => 1, lazy => 1, default => sub { [@PRELOAD] });
37 has postload_dispatch_types => (is => 'rw', required => 1, lazy => 1, default => sub { [@POSTLOAD] });
39 # Wrap accessors so you can assign a list and it will capture a list ref.
40 around qw/preload_dispatch_types postload_dispatch_types/ => sub {
43 return $self->$orig([@_]) if (scalar @_ && ref $_[0] ne 'ARRAY');
44 return $self->$orig(@_);
51 Catalyst::Dispatcher - The Catalyst Dispatcher
59 This is the class that maps public urls to actions in your Catalyst
60 application based on the attributes you set.
66 Construct a new dispatcher.
71 my ($self, $params) = @_;
74 Catalyst::ActionContainer->new( { part => '/', actions => {} } );
76 $self->_tree( Tree::Simple->new( $container, Tree::Simple->ROOT ) );
79 =head2 $self->preload_dispatch_types
81 An arrayref of pre-loaded dispatchtype classes
83 Entries are considered to be available as C<Catalyst::DispatchType::CLASS>
84 To use a custom class outside the regular C<Catalyst> namespace, prefix
85 it with a C<+>, like so:
89 =head2 $self->postload_dispatch_types
91 An arrayref of post-loaded dispatchtype classes
93 Entries are considered to be available as C<Catalyst::DispatchType::CLASS>
94 To use a custom class outside the regular C<Catalyst> namespace, prefix
95 it with a C<+>, like so:
99 =head2 $self->dispatch($c)
101 Delegate the dispatch to the action that matched the url, or return a
102 message about unknown resource
107 my ( $self, $c ) = @_;
108 if ( my $action = $c->action ) {
109 $c->forward( join( '/', '', $action->namespace, '_DISPATCH' ) );
112 my $path = $c->req->path;
114 ? qq/Unknown resource "$path"/
115 : "No default action defined";
116 $c->log->error($error) if $c->debug;
121 # $self->_command2action( $c, $command [, \@arguments ] )
122 # $self->_command2action( $c, $command [, \@captures, \@arguments ] )
123 # Search for an action, from the command and returns C<($action, $args, $captures)> on
124 # success. Returns C<(0)> on error.
126 sub _command2action {
127 my ( $self, $c, $command, @extra_params ) = @_;
130 $c->log->debug('Nothing to go to') if $c->debug;
134 my (@args, @captures);
136 if ( ref( $extra_params[-2] ) eq 'ARRAY' ) {
137 @captures = @{ pop @extra_params };
140 if ( ref( $extra_params[-1] ) eq 'ARRAY' ) {
141 @args = @{ pop @extra_params }
143 # this is a copy, it may take some abuse from
144 # ->_invoke_as_path if the path had trailing parts
145 @args = @{ $c->request->arguments };
150 # go to a string path ("/foo/bar/gorch")
152 if (blessed($command) && $command->isa('Catalyst::Action')) {
156 $action = $self->_invoke_as_path( $c, "$command", \@args );
159 # go to a component ( "MyApp::*::Foo" or $c->component("...")
160 # - a path or an object)
162 my $method = @extra_params ? $extra_params[0] : "process";
163 $action = $self->_invoke_as_component( $c, $command, $method );
166 return $action, \@args, \@captures;
169 =head2 $self->visit( $c, $command [, \@arguments ] )
171 Documented in L<Catalyst>
177 $self->_do_visit('visit', @_);
183 my ( $c, $command ) = @_;
184 my ( $action, $args, $captures ) = $self->_command2action(@_);
185 my $error = qq/Couldn't $opname("$command"): /;
188 $error .= qq/Couldn't $opname to command "$command": /
189 .qq/Invalid action or component./;
191 elsif (!defined $action->namespace) {
192 $error .= qq/Action has no namespace: cannot $opname() to a plain /
193 .qq/method or component, must be an :Action of some sort./
195 elsif (!$action->class->can('_DISPATCH')) {
196 $error .= qq/Action cannot _DISPATCH. /
197 .qq/Did you try to $opname() a non-controller action?/;
205 $c->log->debug($error) if $c->debug;
209 $action = $self->expand_action($action);
211 local $c->request->{arguments} = $args;
212 local $c->request->{captures} = $captures;
213 local $c->{namespace} = $action->{'namespace'};
214 local $c->{action} = $action;
219 =head2 $self->go( $c, $command [, \@arguments ] )
221 Documented in L<Catalyst>
227 $self->_do_visit('go', @_);
231 =head2 $self->forward( $c, $command [, \@arguments ] )
233 Documented in L<Catalyst>
239 $self->_do_forward(forward => @_);
245 my ( $c, $command ) = @_;
246 my ( $action, $args, $captures ) = $self->_command2action(@_);
249 my $error .= qq/Couldn't $opname to command "$command": /
250 .qq/Invalid action or component./;
252 $c->log->debug($error) if $c->debug;
256 no warnings 'recursion';
258 local $c->request->{arguments} = $args;
259 $action->dispatch( $c );
264 =head2 $self->detach( $c, $command [, \@arguments ] )
266 Documented in L<Catalyst>
271 my ( $self, $c, $command, @args ) = @_;
272 $self->_do_forward(detach => $c, $command, @args ) if $command;
273 die $Catalyst::DETACH;
276 sub _action_rel2abs {
277 my ( $self, $c, $path ) = @_;
279 unless ( $path =~ m#^/# ) {
280 my $namespace = $c->stack->[-1]->namespace;
281 $path = "$namespace/$path";
288 sub _invoke_as_path {
289 my ( $self, $c, $rel_path, $args ) = @_;
291 my $path = $self->_action_rel2abs( $c, $rel_path );
293 my ( $tail, @extra_args );
294 while ( ( $path, $tail ) = ( $path =~ m#^(?:(.*)/)?(\w+)?$# ) )
295 { # allow $path to be empty
296 if ( my $action = $c->get_action( $tail, $path ) ) {
297 push @$args, @extra_args;
303 ; # if a match on the global namespace failed then the whole lookup failed
306 unshift @extra_args, $tail;
310 sub _find_component_class {
311 my ( $self, $c, $component ) = @_;
313 return ref($component)
314 || ref( $c->component($component) )
315 || $c->component($component);
318 sub _invoke_as_component {
319 my ( $self, $c, $component, $method ) = @_;
321 #FIXME - Is this resolving needed/should it just return the instance
323 my $class = $self->_find_component_class( $c, $component ) || return 0;
325 my $component_instance = $c->component($class);
326 if (my $code = $component_instance->can('action_for')) {
327 my $possible_action = $component_instance->$code($method);
328 return $possible_action if $possible_action;
331 if ( my $code = $class->can($method) ) {
332 return $self->_method_action_class->new(
336 reverse => "$class->$method",
338 namespace => Catalyst::Utils::class2prefix(
339 $class, $c->config->{case_sensitive}
346 qq/Couldn't forward to "$class". Does not implement "$method"/;
348 $c->log->debug($error)
354 =head2 $self->prepare_action($c)
356 Find an dispatch type that matches $c->req->path, and set args from it.
361 my ( $self, $c ) = @_;
363 my $path = $req->path;
364 my @path = split /\//, $req->path;
365 $req->args( \my @args );
367 unshift( @path, '' ); # Root action
369 DESCEND: while (@path) {
370 $path = join '/', @path;
373 $path = '' if $path eq '/'; # Root action
375 # Check out dispatch types to see if any will handle the path at
378 foreach my $type ( @{ $self->_dispatch_types } ) {
379 last DESCEND if $type->match( $c, $path );
382 # If not, move the last part path to args
383 my $arg = pop(@path);
384 $arg =~ s/%([0-9A-Fa-f]{2})/chr(hex($1))/eg;
388 s/%([0-9A-Fa-f]{2})/chr(hex($1))/eg for grep { defined } @{$req->captures||[]};
390 $c->log->debug( 'Path is "' . $req->match . '"' )
391 if ( $c->debug && defined $req->match && length $req->match );
393 $c->log->debug( 'Arguments are "' . join( '/', @args ) . '"' )
394 if ( $c->debug && @args );
397 =head2 $self->get_action( $action, $namespace )
399 returns a named action from a given namespace.
404 my ( $self, $name, $namespace ) = @_;
407 $namespace = join( "/", grep { length } split '/', ( defined $namespace ? $namespace : "" ) );
409 return $self->_action_hash->{"${namespace}/${name}"};
412 =head2 $self->get_action_by_path( $path );
414 Returns the named action by its full path.
418 sub get_action_by_path {
419 my ( $self, $path ) = @_;
421 $path = "/$path" unless $path =~ /\//;
422 $self->_action_hash->{$path};
425 =head2 $self->get_actions( $c, $action, $namespace )
430 my ( $self, $c, $action, $namespace ) = @_;
431 return [] unless $action;
433 $namespace = join( "/", grep { length } split '/', $namespace || "" );
435 my @match = $self->get_containers($namespace);
437 return map { $_->get_action($action) } @match;
440 =head2 $self->get_containers( $namespace )
442 Return all the action containers for a given namespace, inclusive
447 my ( $self, $namespace ) = @_;
449 $namespace = '' if $namespace eq '/';
453 if ( length $namespace ) {
455 push @containers, $self->_container_hash->{$namespace};
456 } while ( $namespace =~ s#/[^/]+$## );
459 return reverse grep { defined } @containers, $self->_container_hash->{''};
461 #return (split '/', $namespace); # isnt this more clear?
462 my @parts = split '/', $namespace;
465 =head2 $self->uri_for_action($action, \@captures)
467 Takes a Catalyst::Action object and action parameters and returns a URI
468 part such that if $c->req->path were this URI part, this action would be
469 dispatched to with $c->req->captures set to the supplied arrayref.
471 If the action object is not available for external dispatch or the dispatcher
472 cannot determine an appropriate URI, this method will return undef.
477 my ( $self, $action, $captures) = @_;
479 foreach my $dispatch_type ( @{ $self->_dispatch_types } ) {
480 my $uri = $dispatch_type->uri_for_action( $action, $captures );
481 return( $uri eq '' ? '/' : $uri )
489 expand an action into a full representation of the dispatch.
490 mostly useful for chained, other actions will just return a
496 my ($self, $action) = @_;
498 foreach my $dispatch_type (@{ $self->_dispatch_types }) {
499 my $expanded = $dispatch_type->expand_action($action);
500 return $expanded if $expanded;
506 =head2 $self->register( $c, $action )
508 Make sure all required dispatch types for this action are loaded, then
509 pass the action to our dispatch types so they can register it if required.
510 Also, set up the tree with the action containers.
515 my ( $self, $c, $action ) = @_;
517 my $registered = $self->_registered_dispatch_types;
519 #my $priv = 0; #seems to be unused
520 foreach my $key ( keys %{ $action->attributes } ) {
521 next if $key eq 'Private';
522 my $class = "Catalyst::DispatchType::$key";
523 unless ( $registered->{$class} ) {
524 # FIXME - Some error checking and re-throwing needed here, as
525 # we eat exceptions loading dispatch types.
526 eval { Class::MOP::load_class($class) };
527 push( @{ $self->_dispatch_types }, $class->new ) unless $@;
528 $registered->{$class} = 1;
532 # Pass the action to our dispatch types so they can register it if reqd.
533 foreach my $type ( @{ $self->_dispatch_types } ) {
534 $type->register( $c, $action );
537 my $namespace = $action->namespace;
538 my $name = $action->name;
540 my $container = $self->_find_or_create_action_container($namespace);
542 # Set the method value
543 $container->add_action($action);
545 $self->_action_hash->{"$namespace/$name"} = $action;
546 $self->_container_hash->{$namespace} = $container;
549 sub _find_or_create_action_container {
550 my ( $self, $namespace ) = @_;
552 my $tree ||= $self->_tree;
554 return $tree->getNodeValue unless $namespace;
556 my @namespace = split '/', $namespace;
557 return $self->_find_or_create_namespace_node( $tree, @namespace )
561 sub _find_or_create_namespace_node {
562 my ( $self, $parent, $part, @namespace ) = @_;
564 return $parent unless $part;
567 ( grep { $_->getNodeValue->part eq $part } $parent->getAllChildren )[0];
570 my $container = Catalyst::ActionContainer->new($part);
571 $parent->addChild( $child = Tree::Simple->new($container) );
574 $self->_find_or_create_namespace_node( $child, @namespace );
577 =head2 $self->setup_actions( $class, $context )
579 Loads all of the preload dispatch types, registers their actions and then
580 loads all of the postload dispatch types, and iterates over the tree of
581 actions, displaying the debug information if appropriate.
586 my ( $self, $c ) = @_;
589 $self->_load_dispatch_types( @{ $self->preload_dispatch_types } );
590 @{ $self->_registered_dispatch_types }{@classes} = (1) x @classes;
592 foreach my $comp ( values %{ $c->components } ) {
593 $comp->register_actions($c) if $comp->can('register_actions');
596 $self->_load_dispatch_types( @{ $self->postload_dispatch_types } );
598 return unless $c->debug;
599 $self->_display_action_tables($c);
602 sub _display_action_tables {
605 my $column_width = Catalyst::Utils::term_width() - 20 - 36 - 12;
606 my $privates = Text::SimpleTable->new(
607 [ 20, 'Private' ], [ 36, 'Class' ], [ $column_width, 'Method' ]
612 my ( $walker, $parent, $prefix ) = @_;
613 $prefix .= $parent->getNodeValue || '';
614 $prefix .= '/' unless $prefix =~ /\/$/;
615 my $node = $parent->getNodeValue->actions;
617 for my $action ( keys %{$node} ) {
618 my $action_obj = $node->{$action};
620 if ( ( $action =~ /^_.*/ )
621 && ( !$c->config->{show_internal_actions} ) );
622 $privates->row( "$prefix$action", $action_obj->class, $action );
626 $walker->( $walker, $_, $prefix ) for $parent->getAllChildren;
629 $walker->( $walker, $self->_tree, '' );
630 $c->log->debug( "Loaded Private actions:\n" . $privates->draw . "\n" )
633 # List all public actions
634 $_->list($c) for @{ $self->_dispatch_types };
637 sub _load_dispatch_types {
638 my ( $self, @types ) = @_;
642 # Preload action types
643 for my $type (@types) {
645 ( $type =~ /^\+(.*)$/ ) ? $1 : "Catalyst::DispatchType::${type}";
647 eval { Class::MOP::load_class($class) };
648 Catalyst::Exception->throw( message => qq/Couldn't load "$class"/ )
650 push @{ $self->_dispatch_types }, $class->new;
652 push @loaded, $class;
658 # Dont document this until someone else is happy with beaviour. Ash 2009/03/16
660 my ($self, $name) = @_;
662 unless ($name =~ s/^\+//) {
663 $name = "Catalyst::DispatchType::" . $name;
666 for (@{ $self->_dispatch_types }) {
667 return $_ if ref($_) eq $name;
674 # 5.70 backwards compatibility hacks.
676 # Various plugins (e.g. Plugin::Server and Plugin::Authorization::ACL)
677 # need the methods here which *should* be private..
679 # However we can't really take them away until there is a sane API for
680 # building actions and configuring / introspecting the dispatcher.
681 # In 5.90, we should build that infrastructure, port the plugins which
682 # use it, and then take the crap below away.
683 # See also t/lib/TestApp/Plugin/AddDispatchTypes.pm
685 # Alias _method_name to method_name, add a before modifier to warn..
686 foreach my $public_method_name (qw/
689 registered_dispatch_types
694 my $private_method_name = '_' . $public_method_name;
695 my $meta = __PACKAGE__->meta; # Calling meta method here fine as we happen at compile time.
696 $meta->add_method($public_method_name, $meta->get_method($private_method_name));
698 my %package_hash; # Only warn once per method, per package. These are infrequent enough that
699 # I haven't provided a way to disable them, patches welcome.
700 $meta->add_before_method_modifier($public_method_name, sub {
701 my $class = blessed(shift);
702 $package_hash{$class}++ || do {
703 warn("Class $class is calling the deprecated method Catalyst::Dispatcher::$public_method_name,\n"
704 . "this will be removed in Catalyst 5.9X");
709 # End 5.70 backwards compatibility hacks.
712 __PACKAGE__->meta->make_immutable;
720 Catalyst Contributors, see Catalyst.pm
724 This program is free software, you can redistribute it and/or modify it under
725 the same terms as Perl itself.