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 my $class = $self->_find_component_class( $c, $component ) || return 0;
323 if (my $code = $component_instance->can('action_for')) {
324 my $possible_action = $component_instance->$code($method);
325 return $possible_action if $possible_action;
328 if ( my $code = $class->can($method) ) {
329 return $self->_method_action_class->new(
333 reverse => "$class->$method",
335 namespace => Catalyst::Utils::class2prefix(
336 $class, $c->config->{case_sensitive}
343 qq/Couldn't forward to "$class". Does not implement "$method"/;
345 $c->log->debug($error)
351 =head2 $self->prepare_action($c)
353 Find an dispatch type that matches $c->req->path, and set args from it.
358 my ( $self, $c ) = @_;
360 my $path = $req->path;
361 my @path = split /\//, $req->path;
362 $req->args( \my @args );
364 unshift( @path, '' ); # Root action
366 DESCEND: while (@path) {
367 $path = join '/', @path;
370 $path = '' if $path eq '/'; # Root action
372 # Check out dispatch types to see if any will handle the path at
375 foreach my $type ( @{ $self->_dispatch_types } ) {
376 last DESCEND if $type->match( $c, $path );
379 # If not, move the last part path to args
380 my $arg = pop(@path);
381 $arg =~ s/%([0-9A-Fa-f]{2})/chr(hex($1))/eg;
385 s/%([0-9A-Fa-f]{2})/chr(hex($1))/eg for grep { defined } @{$req->captures||[]};
387 $c->log->debug( 'Path is "' . $req->match . '"' )
388 if ( $c->debug && defined $req->match && length $req->match );
390 $c->log->debug( 'Arguments are "' . join( '/', @args ) . '"' )
391 if ( $c->debug && @args );
394 =head2 $self->get_action( $action, $namespace )
396 returns a named action from a given namespace.
401 my ( $self, $name, $namespace ) = @_;
404 $namespace = join( "/", grep { length } split '/', ( defined $namespace ? $namespace : "" ) );
406 return $self->_action_hash->{"${namespace}/${name}"};
409 =head2 $self->get_action_by_path( $path );
411 Returns the named action by its full path.
415 sub get_action_by_path {
416 my ( $self, $path ) = @_;
418 $path = "/$path" unless $path =~ /\//;
419 $self->_action_hash->{$path};
422 =head2 $self->get_actions( $c, $action, $namespace )
427 my ( $self, $c, $action, $namespace ) = @_;
428 return [] unless $action;
430 $namespace = join( "/", grep { length } split '/', $namespace || "" );
432 my @match = $self->get_containers($namespace);
434 return map { $_->get_action($action) } @match;
437 =head2 $self->get_containers( $namespace )
439 Return all the action containers for a given namespace, inclusive
444 my ( $self, $namespace ) = @_;
446 $namespace = '' if $namespace eq '/';
450 if ( length $namespace ) {
452 push @containers, $self->_container_hash->{$namespace};
453 } while ( $namespace =~ s#/[^/]+$## );
456 return reverse grep { defined } @containers, $self->_container_hash->{''};
458 #return (split '/', $namespace); # isnt this more clear?
459 my @parts = split '/', $namespace;
462 =head2 $self->uri_for_action($action, \@captures)
464 Takes a Catalyst::Action object and action parameters and returns a URI
465 part such that if $c->req->path were this URI part, this action would be
466 dispatched to with $c->req->captures set to the supplied arrayref.
468 If the action object is not available for external dispatch or the dispatcher
469 cannot determine an appropriate URI, this method will return undef.
474 my ( $self, $action, $captures) = @_;
476 foreach my $dispatch_type ( @{ $self->_dispatch_types } ) {
477 my $uri = $dispatch_type->uri_for_action( $action, $captures );
478 return( $uri eq '' ? '/' : $uri )
486 expand an action into a full representation of the dispatch.
487 mostly useful for chained, other actions will just return a
493 my ($self, $action) = @_;
495 foreach my $dispatch_type (@{ $self->_dispatch_types }) {
496 my $expanded = $dispatch_type->expand_action($action);
497 return $expanded if $expanded;
503 =head2 $self->register( $c, $action )
505 Make sure all required dispatch types for this action are loaded, then
506 pass the action to our dispatch types so they can register it if required.
507 Also, set up the tree with the action containers.
512 my ( $self, $c, $action ) = @_;
514 my $registered = $self->_registered_dispatch_types;
516 #my $priv = 0; #seems to be unused
517 foreach my $key ( keys %{ $action->attributes } ) {
518 next if $key eq 'Private';
519 my $class = "Catalyst::DispatchType::$key";
520 unless ( $registered->{$class} ) {
521 # FIXME - Some error checking and re-throwing needed here, as
522 # we eat exceptions loading dispatch types.
523 eval { Class::MOP::load_class($class) };
524 push( @{ $self->_dispatch_types }, $class->new ) unless $@;
525 $registered->{$class} = 1;
529 # Pass the action to our dispatch types so they can register it if reqd.
530 foreach my $type ( @{ $self->_dispatch_types } ) {
531 $type->register( $c, $action );
534 my $namespace = $action->namespace;
535 my $name = $action->name;
537 my $container = $self->_find_or_create_action_container($namespace);
539 # Set the method value
540 $container->add_action($action);
542 $self->_action_hash->{"$namespace/$name"} = $action;
543 $self->_container_hash->{$namespace} = $container;
546 sub _find_or_create_action_container {
547 my ( $self, $namespace ) = @_;
549 my $tree ||= $self->_tree;
551 return $tree->getNodeValue unless $namespace;
553 my @namespace = split '/', $namespace;
554 return $self->_find_or_create_namespace_node( $tree, @namespace )
558 sub _find_or_create_namespace_node {
559 my ( $self, $parent, $part, @namespace ) = @_;
561 return $parent unless $part;
564 ( grep { $_->getNodeValue->part eq $part } $parent->getAllChildren )[0];
567 my $container = Catalyst::ActionContainer->new($part);
568 $parent->addChild( $child = Tree::Simple->new($container) );
571 $self->_find_or_create_namespace_node( $child, @namespace );
574 =head2 $self->setup_actions( $class, $context )
576 Loads all of the preload dispatch types, registers their actions and then
577 loads all of the postload dispatch types, and iterates over the tree of
578 actions, displaying the debug information if appropriate.
583 my ( $self, $c ) = @_;
586 $self->_load_dispatch_types( @{ $self->preload_dispatch_types } );
587 @{ $self->_registered_dispatch_types }{@classes} = (1) x @classes;
589 foreach my $comp ( values %{ $c->components } ) {
590 $comp->register_actions($c) if $comp->can('register_actions');
593 $self->_load_dispatch_types( @{ $self->postload_dispatch_types } );
595 return unless $c->debug;
596 $self->_display_action_tables($c);
599 sub _display_action_tables {
602 my $column_width = Catalyst::Utils::term_width() - 20 - 36 - 12;
603 my $privates = Text::SimpleTable->new(
604 [ 20, 'Private' ], [ 36, 'Class' ], [ $column_width, 'Method' ]
609 my ( $walker, $parent, $prefix ) = @_;
610 $prefix .= $parent->getNodeValue || '';
611 $prefix .= '/' unless $prefix =~ /\/$/;
612 my $node = $parent->getNodeValue->actions;
614 for my $action ( keys %{$node} ) {
615 my $action_obj = $node->{$action};
617 if ( ( $action =~ /^_.*/ )
618 && ( !$c->config->{show_internal_actions} ) );
619 $privates->row( "$prefix$action", $action_obj->class, $action );
623 $walker->( $walker, $_, $prefix ) for $parent->getAllChildren;
626 $walker->( $walker, $self->_tree, '' );
627 $c->log->debug( "Loaded Private actions:\n" . $privates->draw . "\n" )
630 # List all public actions
631 $_->list($c) for @{ $self->_dispatch_types };
634 sub _load_dispatch_types {
635 my ( $self, @types ) = @_;
639 # Preload action types
640 for my $type (@types) {
642 ( $type =~ /^\+(.*)$/ ) ? $1 : "Catalyst::DispatchType::${type}";
644 eval { Class::MOP::load_class($class) };
645 Catalyst::Exception->throw( message => qq/Couldn't load "$class"/ )
647 push @{ $self->_dispatch_types }, $class->new;
649 push @loaded, $class;
655 # Dont document this until someone else is happy with beaviour. Ash 2009/03/16
657 my ($self, $name) = @_;
659 unless ($name =~ s/^\+//) {
660 $name = "Catalyst::DispatchType::" . $name;
663 for (@{ $self->_dispatch_types }) {
664 return $_ if ref($_) eq $name;
671 # 5.70 backwards compatibility hacks.
673 # Various plugins (e.g. Plugin::Server and Plugin::Authorization::ACL)
674 # need the methods here which *should* be private..
676 # However we can't really take them away until there is a sane API for
677 # building actions and configuring / introspecting the dispatcher.
678 # In 5.90, we should build that infrastructure, port the plugins which
679 # use it, and then take the crap below away.
680 # See also t/lib/TestApp/Plugin/AddDispatchTypes.pm
682 # Alias _method_name to method_name, add a before modifier to warn..
683 foreach my $public_method_name (qw/
686 registered_dispatch_types
691 my $private_method_name = '_' . $public_method_name;
692 my $meta = __PACKAGE__->meta; # Calling meta method here fine as we happen at compile time.
693 $meta->add_method($public_method_name, $meta->get_method($private_method_name));
695 my %package_hash; # Only warn once per method, per package. These are infrequent enough that
696 # I haven't provided a way to disable them, patches welcome.
697 $meta->add_before_method_modifier($public_method_name, sub {
698 my $class = blessed(shift);
699 $package_hash{$class}++ || do {
700 warn("Class $class is calling the deprecated method Catalyst::Dispatcher::$public_method_name,\n"
701 . "this will be removed in Catalyst 5.9X");
706 # End 5.70 backwards compatibility hacks.
709 __PACKAGE__->meta->make_immutable;
717 Catalyst Contributors, see Catalyst.pm
721 This program is free software, you can redistribute it and/or modify it under
722 the same terms as Perl itself.