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5882c86e |
1 | package Catalyst::DispatchType::Chained; |
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2 | |
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3 | use Moose; |
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4 | extends 'Catalyst::DispatchType'; |
5 | |
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6 | use Text::SimpleTable; |
7 | use Catalyst::ActionChain; |
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8 | use Catalyst::Utils; |
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9 | use URI; |
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10 | use Scalar::Util (); |
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11 | |
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12 | has _endpoints => ( |
13 | is => 'rw', |
14 | isa => 'ArrayRef', |
15 | required => 1, |
16 | default => sub{ [] }, |
17 | ); |
18 | |
19 | has _actions => ( |
20 | is => 'rw', |
21 | isa => 'HashRef', |
22 | required => 1, |
23 | default => sub{ {} }, |
24 | ); |
25 | |
26 | has _children_of => ( |
27 | is => 'rw', |
28 | isa => 'HashRef', |
29 | required => 1, |
30 | default => sub{ {} }, |
31 | ); |
32 | |
0fc2d522 |
33 | no Moose; |
34 | |
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35 | # please don't perltidy this. hairy code within. |
36 | |
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37 | =head1 NAME |
38 | |
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39 | Catalyst::DispatchType::Chained - Path Part DispatchType |
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40 | |
41 | =head1 SYNOPSIS |
42 | |
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43 | Path part matching, allowing several actions to sequentially take care of processing a request: |
44 | |
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45 | # root action - captures one argument after it |
46 | sub foo_setup : Chained('/') PathPart('foo') CaptureArgs(1) { |
47 | my ( $self, $c, $foo_arg ) = @_; |
48 | ... |
49 | } |
50 | |
51 | # child action endpoint - takes one argument |
52 | sub bar : Chained('foo_setup') Args(1) { |
53 | my ( $self, $c, $bar_arg ) = @_; |
54 | ... |
55 | } |
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56 | |
57 | =head1 DESCRIPTION |
58 | |
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59 | Dispatch type managing default behaviour. For more information on |
60 | dispatch types, see: |
61 | |
62 | =over 4 |
63 | |
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64 | =item * L<Catalyst::Manual::Intro> for how they affect application authors |
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65 | |
66 | =item * L<Catalyst::DispatchType> for implementation information. |
67 | |
68 | =back |
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69 | |
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70 | =head1 METHODS |
71 | |
72 | =head2 $self->list($c) |
73 | |
74 | Debug output for Path Part dispatch points |
75 | |
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76 | =cut |
77 | |
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78 | sub list { |
79 | my ( $self, $c ) = @_; |
80 | |
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81 | return unless $self->_endpoints; |
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82 | |
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83 | my $avail_width = Catalyst::Utils::term_width() - 9; |
84 | my $col1_width = ($avail_width * .50) < 35 ? 35 : int($avail_width * .50); |
85 | my $col2_width = $avail_width - $col1_width; |
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86 | my $paths = Text::SimpleTable->new( |
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87 | [ $col1_width, 'Path Spec' ], [ $col2_width, 'Private' ], |
39fc2ce1 |
88 | ); |
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89 | |
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90 | my $has_unattached_actions; |
91 | my $unattached_actions = Text::SimpleTable->new( |
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92 | [ $col1_width, 'Private' ], [ $col2_width, 'Missing parent' ], |
007a7ca0 |
93 | ); |
94 | |
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95 | ENDPOINT: foreach my $endpoint ( |
96 | sort { $a->reverse cmp $b->reverse } |
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97 | @{ $self->_endpoints } |
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98 | ) { |
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99 | my $args = $endpoint->list_extra_info->{Args}; |
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100 | my @parts = (defined($args) ? (("*") x $args) : '...'); |
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101 | my @parents = (); |
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102 | my $parent = "DUMMY"; |
103 | my $curr = $endpoint; |
104 | while ($curr) { |
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105 | if (my $cap = $curr->list_extra_info->{CaptureArgs}) { |
106 | unshift(@parts, (("*") x $cap)); |
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107 | } |
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108 | if (my $pp = $curr->attributes->{PathPart}) { |
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109 | unshift(@parts, $pp->[0]) |
110 | if (defined $pp->[0] && length $pp->[0]); |
111 | } |
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112 | $parent = $curr->attributes->{Chained}->[0]; |
be5cb4e4 |
113 | $curr = $self->_actions->{$parent}; |
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114 | unshift(@parents, $curr) if $curr; |
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115 | } |
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116 | if ($parent ne '/') { |
117 | $has_unattached_actions = 1; |
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118 | $unattached_actions->row('/' . ($parents[0] || $endpoint)->reverse, $parent); |
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119 | next ENDPOINT; |
120 | } |
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121 | my @rows; |
122 | foreach my $p (@parents) { |
123 | my $name = "/${p}"; |
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124 | if (defined(my $cap = $p->list_extra_info->{CaptureArgs})) { |
125 | $name .= ' ('.$cap.')'; |
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126 | } |
127 | unless ($p eq $parents[0]) { |
128 | $name = "-> ${name}"; |
129 | } |
130 | push(@rows, [ '', $name ]); |
131 | } |
132 | push(@rows, [ '', (@rows ? "=> " : '')."/${endpoint}" ]); |
f4624073 |
133 | $rows[0][0] = join('/', '', @parts) || '/'; |
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134 | $paths->row(@$_) for @rows; |
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135 | } |
136 | |
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137 | $c->log->debug( "Loaded Chained actions:\n" . $paths->draw . "\n" ); |
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138 | $c->log->debug( "Unattached Chained actions:\n", $unattached_actions->draw . "\n" ) |
139 | if $has_unattached_actions; |
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140 | } |
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141 | |
142 | =head2 $self->match( $c, $path ) |
143 | |
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144 | Calls C<recurse_match> to see if a chain matches the C<$path>. |
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145 | |
146 | =cut |
147 | |
148 | sub match { |
149 | my ( $self, $c, $path ) = @_; |
150 | |
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151 | my $request = $c->request; |
152 | return 0 if @{$request->args}; |
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153 | |
154 | my @parts = split('/', $path); |
155 | |
6365b527 |
156 | my ($chain, $captures, $parts) = $self->recurse_match($c, '/', \@parts); |
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157 | |
158 | if ($parts && @$parts) { |
159 | for my $arg (@$parts) { |
160 | $arg =~ s/%([0-9A-Fa-f]{2})/chr(hex($1))/eg; |
161 | push @{$request->args}, $arg; |
162 | } |
163 | } |
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164 | |
165 | return 0 unless $chain; |
166 | |
167 | my $action = Catalyst::ActionChain->from_chain($chain); |
168 | |
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169 | $request->action("/${action}"); |
170 | $request->match("/${action}"); |
171 | $request->captures($captures); |
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172 | $c->action($action); |
173 | $c->namespace( $action->namespace ); |
174 | |
175 | return 1; |
176 | } |
177 | |
178 | =head2 $self->recurse_match( $c, $parent, \@path_parts ) |
179 | |
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180 | Recursive search for a matching chain. |
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181 | |
182 | =cut |
183 | |
184 | sub recurse_match { |
185 | my ( $self, $c, $parent, $path_parts ) = @_; |
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186 | my $children = $self->_children_of->{$parent}; |
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187 | return () unless $children; |
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188 | my $best_action; |
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189 | my @captures; |
1b04b972 |
190 | TRY: foreach my $try_part (sort { length($b) <=> length($a) } |
cdc97b63 |
191 | keys %$children) { |
1b04b972 |
192 | # $b then $a to try longest part first |
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193 | my @parts = @$path_parts; |
194 | if (length $try_part) { # test and strip PathPart |
195 | next TRY unless |
196 | ($try_part eq join('/', # assemble equal number of parts |
197 | splice( # and strip them off @parts as well |
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198 | @parts, 0, scalar(@{[split('/', $try_part)]}) |
199 | ))); # @{[]} to avoid split to @_ |
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200 | } |
201 | my @try_actions = @{$children->{$try_part}}; |
202 | TRY_ACTION: foreach my $action (@try_actions) { |
1c34f703 |
203 | if (my $capture_attr = $action->attributes->{CaptureArgs}) { |
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204 | $capture_attr ||= 0; |
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205 | |
206 | # Short-circuit if not enough remaining parts |
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207 | next TRY_ACTION unless @parts >= $capture_attr->[0]; |
f505df49 |
208 | |
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209 | my @captures; |
210 | my @parts = @parts; # localise |
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211 | |
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212 | # strip CaptureArgs into list |
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213 | push(@captures, splice(@parts, 0, $capture_attr->[0])); |
214 | |
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215 | # check if the action may fit, depending on a given test by the app |
216 | if ($action->can('match_captures')) { next TRY_ACTION unless $action->match_captures($c, \@captures) } |
217 | |
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218 | # try the remaining parts against children of this action |
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219 | my ($actions, $captures, $action_parts, $n_pathparts) = $self->recurse_match( |
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220 | $c, '/'.$action->reverse, \@parts |
221 | ); |
2f381252 |
222 | # No best action currently |
223 | # OR The action has less parts |
224 | # OR The action has equal parts but less captured data (ergo more defined) |
225 | if ($actions && |
226 | (!$best_action || |
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227 | $#$action_parts < $#{$best_action->{parts}} || |
2f381252 |
228 | ($#$action_parts == $#{$best_action->{parts}} && |
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229 | $#$captures < $#{$best_action->{captures}} && |
230 | $n_pathparts > $best_action->{n_pathparts}))) { |
231 | my @pathparts = split /\//, $action->attributes->{PathPart}->[0]; |
6b495723 |
232 | $best_action = { |
233 | actions => [ $action, @$actions ], |
234 | captures=> [ @captures, @$captures ], |
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235 | parts => $action_parts, |
236 | n_pathparts => scalar(@pathparts) + $n_pathparts, |
237 | }; |
6b495723 |
238 | } |
239 | } |
240 | else { |
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241 | { |
242 | local $c->req->{arguments} = [ @{$c->req->args}, @parts ]; |
243 | next TRY_ACTION unless $action->match($c); |
244 | } |
5c6d829d |
245 | my $args_attr = $action->attributes->{Args}->[0]; |
0c78acb6 |
246 | my @pathparts = split /\//, $action->attributes->{PathPart}->[0]; |
953c176d |
247 | # No best action currently |
248 | # OR This one matches with fewer parts left than the current best action, |
249 | # And therefore is a better match |
b0ad47c1 |
250 | # OR No parts and this expects 0 |
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251 | # The current best action might also be Args(0), |
252 | # but we couldn't chose between then anyway so we'll take the last seen |
253 | |
254 | if (!$best_action || |
255 | @parts < @{$best_action->{parts}} || |
a53e36d1 |
256 | (!@parts && defined($args_attr) && $args_attr eq "0")){ |
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257 | $best_action = { |
258 | actions => [ $action ], |
259 | captures=> [], |
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260 | parts => \@parts, |
261 | n_pathparts => scalar(@pathparts), |
262 | }; |
953c176d |
263 | } |
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264 | } |
265 | } |
266 | } |
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267 | return @$best_action{qw/actions captures parts n_pathparts/} if $best_action; |
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268 | return (); |
269 | } |
270 | |
271 | =head2 $self->register( $c, $action ) |
272 | |
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273 | Calls register_path for every Path attribute for the given $action. |
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274 | |
275 | =cut |
276 | |
277 | sub register { |
278 | my ( $self, $c, $action ) = @_; |
279 | |
1dc8af44 |
280 | my @chained_attr = @{ $action->attributes->{Chained} || [] }; |
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281 | |
1dc8af44 |
282 | return 0 unless @chained_attr; |
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283 | |
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284 | if (@chained_attr > 1) { |
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285 | Catalyst::Exception->throw( |
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286 | "Multiple Chained attributes not supported registering ${action}" |
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287 | ); |
288 | } |
13c6b4cc |
289 | my $chained_to = $chained_attr[0]; |
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290 | |
13c6b4cc |
291 | Catalyst::Exception->throw( |
292 | "Actions cannot chain to themselves registering /${action}" |
293 | ) if ($chained_to eq '/' . $action); |
294 | |
295 | my $children = ($self->_children_of->{ $chained_to } ||= {}); |
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296 | |
297 | my @path_part = @{ $action->attributes->{PathPart} || [] }; |
298 | |
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299 | my $part = $action->name; |
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300 | |
09461385 |
301 | if (@path_part == 1 && defined $path_part[0]) { |
302 | $part = $path_part[0]; |
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303 | } elsif (@path_part > 1) { |
304 | Catalyst::Exception->throw( |
f3414019 |
305 | "Multiple PathPart attributes not supported registering " . $action->reverse() |
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306 | ); |
307 | } |
308 | |
8a6a6581 |
309 | if ($part =~ m(^/)) { |
310 | Catalyst::Exception->throw( |
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311 | "Absolute parameters to PathPart not allowed registering " . $action->reverse() |
8a6a6581 |
312 | ); |
313 | } |
314 | |
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315 | $action->attributes->{PathPart} = [ $part ]; |
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316 | |
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317 | unshift(@{ $children->{$part} ||= [] }, $action); |
318 | |
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319 | $self->_actions->{'/'.$action->reverse} = $action; |
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320 | |
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321 | if (exists $action->attributes->{Args}) { |
322 | my $args = $action->attributes->{Args}->[0]; |
323 | if (defined($args) and not ( |
324 | Scalar::Util::looks_like_number($args) and |
325 | int($args) == $args |
326 | )) { |
327 | require Data::Dumper; |
328 | local $Data::Dumper::Terse = 1; |
329 | local $Data::Dumper::Indent = 0; |
330 | $args = Data::Dumper::Dumper($args); |
331 | Catalyst::Exception->throw( |
332 | "Invalid Args($args) for action " . $action->reverse() . |
333 | " (use 'Args' or 'Args(<number>)'" |
334 | ); |
335 | } |
336 | } |
337 | |
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338 | unless ($action->attributes->{CaptureArgs}) { |
be5cb4e4 |
339 | unshift(@{ $self->_endpoints }, $action); |
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340 | } |
341 | |
342 | return 1; |
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343 | } |
344 | |
345 | =head2 $self->uri_for_action($action, $captures) |
346 | |
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347 | Get the URI part for the action, using C<$captures> to fill |
348 | the capturing parts. |
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349 | |
350 | =cut |
351 | |
352 | sub uri_for_action { |
353 | my ( $self, $action, $captures ) = @_; |
354 | |
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355 | return undef unless ($action->attributes->{Chained} |
8b13f357 |
356 | && !$action->attributes->{CaptureArgs}); |
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357 | |
358 | my @parts = (); |
359 | my @captures = @$captures; |
360 | my $parent = "DUMMY"; |
361 | my $curr = $action; |
362 | while ($curr) { |
1c34f703 |
363 | if (my $cap = $curr->attributes->{CaptureArgs}) { |
84ac8ab9 |
364 | return undef unless @captures >= ($cap->[0]||0); # not enough captures |
8b13f357 |
365 | if ($cap->[0]) { |
f9155483 |
366 | unshift(@parts, splice(@captures, -$cap->[0])); |
8b13f357 |
367 | } |
792b40ac |
368 | } |
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369 | if (my $pp = $curr->attributes->{PathPart}) { |
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370 | unshift(@parts, $pp->[0]) |
8b13f357 |
371 | if (defined($pp->[0]) && length($pp->[0])); |
792b40ac |
372 | } |
5882c86e |
373 | $parent = $curr->attributes->{Chained}->[0]; |
be5cb4e4 |
374 | $curr = $self->_actions->{$parent}; |
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375 | } |
792b40ac |
376 | |
377 | return undef unless $parent eq '/'; # fail for dangling action |
378 | |
379 | return undef if @captures; # fail for too many captures |
380 | |
381 | return join('/', '', @parts); |
59d5a638 |
382 | |
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383 | } |
384 | |
ae0e35ee |
385 | =head2 $c->expand_action($action) |
386 | |
b0ad47c1 |
387 | Return a list of actions that represents a chained action. See |
ae0e35ee |
388 | L<Catalyst::Dispatcher> for more info. You probably want to |
389 | use the expand_action it provides rather than this directly. |
390 | |
391 | =cut |
392 | |
52f71256 |
393 | sub expand_action { |
394 | my ($self, $action) = @_; |
395 | |
396 | return unless $action->attributes && $action->attributes->{Chained}; |
397 | |
398 | my @chain; |
399 | my $curr = $action; |
400 | |
401 | while ($curr) { |
402 | push @chain, $curr; |
403 | my $parent = $curr->attributes->{Chained}->[0]; |
404 | $curr = $self->_actions->{$parent}; |
405 | } |
406 | |
407 | return Catalyst::ActionChain->from_chain([reverse @chain]); |
408 | } |
409 | |
e5ecd5bc |
410 | __PACKAGE__->meta->make_immutable; |
f4de8c99 |
411 | 1; |
e5ecd5bc |
412 | |
05a90578 |
413 | =head1 USAGE |
414 | |
415 | =head2 Introduction |
416 | |
417 | The C<Chained> attribute allows you to chain public path parts together |
67869327 |
418 | by their private names. A chain part's path can be specified with |
419 | C<PathPart> and can be declared to expect an arbitrary number of |
420 | arguments. The endpoint of the chain specifies how many arguments it |
421 | gets through the C<Args> attribute. C<:Args(0)> would be none at all, |
422 | C<:Args> without an integer would be unlimited. The path parts that |
423 | aren't endpoints are using C<CaptureArgs> to specify how many parameters |
424 | they expect to receive. As an example setup: |
05a90578 |
425 | |
426 | package MyApp::Controller::Greeting; |
427 | use base qw/ Catalyst::Controller /; |
428 | |
429 | # this is the beginning of our chain |
430 | sub hello : PathPart('hello') Chained('/') CaptureArgs(1) { |
431 | my ( $self, $c, $integer ) = @_; |
432 | $c->stash->{ message } = "Hello "; |
433 | $c->stash->{ arg_sum } = $integer; |
434 | } |
435 | |
436 | # this is our endpoint, because it has no :CaptureArgs |
437 | sub world : PathPart('world') Chained('hello') Args(1) { |
438 | my ( $self, $c, $integer ) = @_; |
439 | $c->stash->{ message } .= "World!"; |
440 | $c->stash->{ arg_sum } += $integer; |
441 | |
442 | $c->response->body( join "<br/>\n" => |
443 | $c->stash->{ message }, $c->stash->{ arg_sum } ); |
444 | } |
445 | |
446 | The debug output provides a separate table for chained actions, showing |
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447 | the whole chain as it would match and the actions it contains. Here's an |
448 | example of the startup output with our actions above: |
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449 | |
450 | ... |
451 | [debug] Loaded Path Part actions: |
452 | .-----------------------+------------------------------. |
453 | | Path Spec | Private | |
454 | +-----------------------+------------------------------+ |
455 | | /hello/*/world/* | /greeting/hello (1) | |
456 | | | => /greeting/world | |
457 | '-----------------------+------------------------------' |
458 | ... |
459 | |
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460 | As you can see, Catalyst only deals with chains as whole paths and |
461 | builds one for each endpoint, which are the actions with C<:Chained> but |
462 | without C<:CaptureArgs>. |
05a90578 |
463 | |
464 | Let's assume this application gets a request at the path |
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465 | C</hello/23/world/12>. What happens then? First, Catalyst will dispatch |
466 | to the C<hello> action and pass the value C<23> as an argument to it |
467 | after the context. It does so because we have previously used |
468 | C<:CaptureArgs(1)> to declare that it has one path part after itself as |
469 | its argument. We told Catalyst that this is the beginning of the chain |
470 | by specifying C<:Chained('/')>. Also note that instead of saying |
471 | C<:PathPart('hello')> we could also just have said C<:PathPart>, as it |
472 | defaults to the name of the action. |
05a90578 |
473 | |
474 | After C<hello> has run, Catalyst goes on to dispatch to the C<world> |
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475 | action. This is the last action to be called: Catalyst knows this is an |
476 | endpoint because we did not specify a C<:CaptureArgs> |
477 | attribute. Nevertheless we specify that this action expects an argument, |
478 | but at this point we're using C<:Args(1)> to do that. We could also have |
479 | said C<:Args> or left it out altogether, which would mean this action |
480 | would get all arguments that are there. This action's C<:Chained> |
481 | attribute says C<hello> and tells Catalyst that the C<hello> action in |
482 | the current controller is its parent. |
05a90578 |
483 | |
484 | With this we have built a chain consisting of two public path parts. |
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485 | C<hello> captures one part of the path as its argument, and also |
486 | specifies the path root as its parent. So this part is |
487 | C</hello/$arg>. The next part is the endpoint C<world>, expecting one |
488 | argument. It sums up to the path part C<world/$arg>. This leads to a |
489 | complete chain of C</hello/$arg/world/$arg> which is matched against the |
490 | requested paths. |
491 | |
492 | This example application would, if run and called by e.g. |
493 | C</hello/23/world/12>, set the stash value C<message> to "Hello" and the |
494 | value C<arg_sum> to "23". The C<world> action would then append "World!" |
495 | to C<message> and add C<12> to the stash's C<arg_sum> value. For the |
496 | sake of simplicity no view is shown. Instead we just put the values of |
497 | the stash into our body. So the output would look like: |
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498 | |
499 | Hello World! |
500 | 35 |
501 | |
67869327 |
502 | And our test server would have given us this debugging output for the |
05a90578 |
503 | request: |
504 | |
505 | ... |
506 | [debug] "GET" request for "hello/23/world/12" from "127.0.0.1" |
507 | [debug] Path is "/greeting/world" |
508 | [debug] Arguments are "12" |
509 | [info] Request took 0.164113s (6.093/s) |
510 | .------------------------------------------+-----------. |
511 | | Action | Time | |
512 | +------------------------------------------+-----------+ |
513 | | /greeting/hello | 0.000029s | |
514 | | /greeting/world | 0.000024s | |
515 | '------------------------------------------+-----------' |
516 | ... |
517 | |
67869327 |
518 | What would be common uses of this dispatch technique? It gives the |
519 | possibility to split up logic that contains steps that each depend on |
520 | each other. An example would be, for example, a wiki path like |
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521 | C</wiki/FooBarPage/rev/23/view>. This chain can be easily built with |
522 | these actions: |
523 | |
524 | sub wiki : PathPart('wiki') Chained('/') CaptureArgs(1) { |
525 | my ( $self, $c, $page_name ) = @_; |
526 | # load the page named $page_name and put the object |
527 | # into the stash |
528 | } |
529 | |
530 | sub rev : PathPart('rev') Chained('wiki') CaptureArgs(1) { |
531 | my ( $self, $c, $revision_id ) = @_; |
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532 | # use the page object in the stash to get at its |
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533 | # revision with number $revision_id |
534 | } |
535 | |
536 | sub view : PathPart Chained('rev') Args(0) { |
537 | my ( $self, $c ) = @_; |
67869327 |
538 | # display the revision in our stash. Another option |
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539 | # would be to forward a compatible object to the action |
540 | # that displays the default wiki pages, unless we want |
541 | # a different interface here, for example restore |
542 | # functionality. |
543 | } |
544 | |
67869327 |
545 | It would now be possible to add other endpoints, for example C<restore> |
546 | to restore this specific revision as the current state. |
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547 | |
67869327 |
548 | You don't have to put all the chained actions in one controller. The |
549 | specification of the parent through C<:Chained> also takes an absolute |
550 | action path as its argument. Just specify it with a leading C</>. |
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551 | |
552 | If you want, for example, to have actions for the public paths |
67869327 |
553 | C</foo/12/edit> and C</foo/12>, just specify two actions with |
05a90578 |
554 | C<:PathPart('foo')> and C<:Chained('/')>. The handler for the former |
67869327 |
555 | path needs a C<:CaptureArgs(1)> attribute and a endpoint with |
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556 | C<:PathPart('edit')> and C<:Chained('foo')>. For the latter path give |
557 | the action just a C<:Args(1)> to mark it as endpoint. This sums up to |
558 | this debugging output: |
559 | |
560 | ... |
561 | [debug] Loaded Path Part actions: |
562 | .-----------------------+------------------------------. |
563 | | Path Spec | Private | |
564 | +-----------------------+------------------------------+ |
565 | | /foo/* | /controller/foo_view | |
566 | | /foo/*/edit | /controller/foo_load (1) | |
567 | | | => /controller/edit | |
568 | '-----------------------+------------------------------' |
569 | ... |
570 | |
b0ad47c1 |
571 | Here's a more detailed specification of the attributes belonging to |
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572 | C<:Chained>: |
573 | |
574 | =head2 Attributes |
575 | |
576 | =over 8 |
577 | |
578 | =item PathPart |
579 | |
580 | Sets the name of this part of the chain. If it is specified without |
581 | arguments, it takes the name of the action as default. So basically |
582 | C<sub foo :PathPart> and C<sub foo :PathPart('foo')> are identical. |
583 | This can also contain slashes to bind to a deeper level. An action |
584 | with C<sub bar :PathPart('foo/bar') :Chained('/')> would bind to |
585 | C</foo/bar/...>. If you don't specify C<:PathPart> it has the same |
586 | effect as using C<:PathPart>, it would default to the action name. |
587 | |
d21a2b27 |
588 | =item PathPrefix |
589 | |
590 | Sets PathPart to the path_prefix of the current controller. |
591 | |
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592 | =item Chained |
593 | |
594 | Has to be specified for every child in the chain. Possible values are |
d21a2b27 |
595 | absolute and relative private action paths or a single slash C</> to |
596 | tell Catalyst that this is the root of a chain. The attribute |
597 | C<:Chained> without arguments also defaults to the C</> behavior. |
598 | Relative action paths may use C<../> to refer to actions in parent |
599 | controllers. |
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600 | |
67869327 |
601 | Because you can specify an absolute path to the parent action, it |
602 | doesn't matter to Catalyst where that parent is located. So, if your |
603 | design requests it, you can redispatch a chain through any controller or |
604 | namespace you want. |
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605 | |
606 | Another interesting possibility gives C<:Chained('.')>, which chains |
67869327 |
607 | itself to an action with the path of the current controller's namespace. |
05a90578 |
608 | For example: |
609 | |
610 | # in MyApp::Controller::Foo |
611 | sub bar : Chained CaptureArgs(1) { ... } |
612 | |
613 | # in MyApp::Controller::Foo::Bar |
614 | sub baz : Chained('.') Args(1) { ... } |
615 | |
616 | This builds up a chain like C</bar/*/baz/*>. The specification of C<.> |
67869327 |
617 | as the argument to Chained here chains the C<baz> action to an action |
618 | with the path of the current controller namespace, namely |
619 | C</foo/bar>. That action chains directly to C</>, so the C</bar/*/baz/*> |
620 | chain comes out as the end product. |
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621 | |
d21a2b27 |
622 | =item ChainedParent |
623 | |
624 | Chains an action to another action with the same name in the parent |
625 | controller. For Example: |
626 | |
627 | # in MyApp::Controller::Foo |
628 | sub bar : Chained CaptureArgs(1) { ... } |
629 | |
630 | # in MyApp::Controller::Foo::Moo |
631 | sub bar : ChainedParent Args(1) { ... } |
632 | |
633 | This builds a chain like C</bar/*/bar/*>. |
634 | |
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635 | =item CaptureArgs |
636 | |
67869327 |
637 | Must be specified for every part of the chain that is not an |
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638 | endpoint. With this attribute Catalyst knows how many of the following |
67869327 |
639 | parts of the path (separated by C</>) this action wants to capture as |
640 | its arguments. If it doesn't expect any, just specify |
641 | C<:CaptureArgs(0)>. The captures get passed to the action's C<@_> right |
642 | after the context, but you can also find them as array references in |
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643 | C<$c-E<gt>request-E<gt>captures-E<gt>[$level]>. The C<$level> is the |
644 | level of the action in the chain that captured the parts of the path. |
645 | |
67869327 |
646 | An action that is part of a chain (that is, one that has a C<:Chained> |
647 | attribute) but has no C<:CaptureArgs> attribute is treated by Catalyst |
648 | as a chain end. |
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649 | |
650 | =item Args |
651 | |
652 | By default, endpoints receive the rest of the arguments in the path. You |
653 | can tell Catalyst through C<:Args> explicitly how many arguments your |
654 | endpoint expects, just like you can with C<:CaptureArgs>. Note that this |
67869327 |
655 | also affects whether this chain is invoked on a request. A chain with an |
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656 | endpoint specifying one argument will only match if exactly one argument |
657 | exists in the path. |
658 | |
659 | You can specify an exact number of arguments like C<:Args(3)>, including |
660 | C<0>. If you just say C<:Args> without any arguments, it is the same as |
67869327 |
661 | leaving it out altogether: The chain is matched regardless of the number |
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662 | of path parts after the endpoint. |
663 | |
67869327 |
664 | Just as with C<:CaptureArgs>, the arguments get passed to the action in |
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665 | C<@_> after the context object. They can also be reached through |
666 | C<$c-E<gt>request-E<gt>arguments>. |
667 | |
668 | =back |
669 | |
67869327 |
670 | =head2 Auto actions, dispatching and forwarding |
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671 | |
672 | Note that the list of C<auto> actions called depends on the private path |
67869327 |
673 | of the endpoint of the chain, not on the chained actions way. The |
674 | C<auto> actions will be run before the chain dispatching begins. In |
675 | every other aspect, C<auto> actions behave as documented. |
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676 | |
677 | The C<forward>ing to other actions does just what you would expect. But if |
678 | you C<detach> out of a chain, the rest of the chain will not get called |
67869327 |
679 | after the C<detach>. |
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680 | |
22faeff5 |
681 | =head2 match_captures |
682 | |
683 | A method which can optionally be implemented by actions to |
684 | stop chain matching. |
685 | |
686 | See L<Catalyst::Action> for further details. |
687 | |
2f381252 |
688 | =head1 AUTHORS |
141459fa |
689 | |
2f381252 |
690 | Catalyst Contributors, see Catalyst.pm |
141459fa |
691 | |
692 | =head1 COPYRIGHT |
693 | |
536bee89 |
694 | This library is free software. You can redistribute it and/or modify it under |
141459fa |
695 | the same terms as Perl itself. |
696 | |
697 | =cut |
698 | |
699 | 1; |