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