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1 | use MooseX::Declare; |
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2 | use MooseX::Role::Parameterized (); |
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3 | |
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4 | class CatalystX::Declare::Keyword::Action { |
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5 | |
6 | |
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7 | use Carp qw( croak ); |
8 | use Perl6::Junction qw( any ); |
9 | use Data::Dump qw( pp ); |
10 | use MooseX::Types::Util qw( has_available_type_export ); |
c2a8165b |
11 | use Moose::Util qw( add_method_modifier ensure_all_roles ); |
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12 | use Class::Inspector; |
13 | use Class::MOP; |
14 | |
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15 | |
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16 | use constant STOP_PARSING => '__MXDECLARE_STOP_PARSING__'; |
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17 | use constant UNDER_VAR => '$CatalystX::Declare::SCOPE::UNDER'; |
fe864e80 |
18 | use constant UNDER_STACK => '@CatalystX::Declare::SCOPE::UNDER_STACK'; |
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19 | |
5fb5cef1 |
20 | use aliased 'CatalystX::Declare::Action::CatchValidationError'; |
8d66ec34 |
21 | use aliased 'CatalystX::Declare::Context::StringParsing'; |
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22 | use aliased 'MooseX::Method::Signatures::Meta::Method'; |
23 | use aliased 'MooseX::MethodAttributes::Role::Meta::Method', 'AttributeRole'; |
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24 | use aliased 'MooseX::MethodAttributes::Role::Meta::Role', 'AttributeMetaRole'; |
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25 | |
26 | |
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27 | method parse (Object $ctx, Str :$modifier?, Int :$skipped_declarator = 0) { |
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28 | |
29 | # somewhere to put the attributes |
30 | my %attributes; |
31 | my @populators; |
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32 | |
33 | # parse declarations |
34 | until (do { $ctx->skipspace; $ctx->peek_next_char } eq any qw( ; { } )) { |
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35 | |
36 | $ctx->skipspace; |
37 | |
38 | # optional commas |
39 | if ($ctx->peek_next_char eq ',') { |
40 | |
41 | my $linestr = $ctx->get_linestr; |
42 | substr($linestr, $ctx->offset, 1) = ''; |
43 | $ctx->set_linestr($linestr); |
44 | |
45 | next; |
46 | } |
47 | |
48 | # next thing should be an option name |
49 | my $option = ( |
50 | $skipped_declarator |
51 | ? $ctx->strip_name |
52 | : do { |
53 | $ctx->skip_declarator; |
54 | $skipped_declarator++; |
55 | $ctx->declarator; |
56 | }) |
57 | or croak "Expected option token, not " . substr($ctx->get_linestr, $ctx->offset); |
58 | |
59 | # we need to be able to handle the rest |
60 | my $handler = $self->can("_handle_${option}_option") |
61 | or croak "Unknown action option: $option"; |
62 | |
63 | # call the handler |
e10b92dd |
64 | my $populator = $self->$handler($ctx, \%attributes); |
65 | |
66 | if ($populator and $populator eq STOP_PARSING) { |
67 | |
68 | return $ctx->shadow(sub (&) { |
69 | my ($body) = @_; |
70 | return $body->(); |
71 | }); |
72 | } |
73 | |
74 | push @populators, $populator |
75 | if defined $populator; |
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76 | } |
77 | |
78 | croak "Need an action specification" |
79 | unless exists $attributes{Signature}; |
80 | |
81 | my $name = $attributes{Subname}; |
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82 | |
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83 | my $method = Method->wrap( |
84 | signature => qq{($attributes{Signature})}, |
85 | package_name => $ctx->get_curstash_name, |
86 | name => $name, |
87 | ); |
88 | |
a1dd1788 |
89 | AttributeRole->meta->apply($method); |
90 | |
eb97acbb |
91 | my $count = $self->_count_positional_arguments($method); |
92 | $attributes{CaptureArgs} = $count |
93 | if defined $count; |
94 | |
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95 | $_->($method) |
96 | for @populators; |
97 | |
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98 | unless ($attributes{Private}) { |
99 | $attributes{PathPart} ||= "'$name'"; |
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100 | |
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101 | delete $attributes{CaptureArgs} |
102 | if exists $attributes{Args}; |
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103 | |
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104 | $attributes{CaptureArgs} = 0 |
105 | unless exists $attributes{Args} |
106 | or exists $attributes{CaptureArgs}; |
107 | } |
108 | |
109 | if ($attributes{Private}) { |
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110 | delete $attributes{ $_ } |
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111 | for qw( Args CaptureArgs Chained Signature Private ); |
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112 | } |
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113 | |
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114 | $self->_inject_attributes($ctx, \%attributes); |
115 | |
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116 | if ($ctx->peek_next_char eq '{') { |
117 | $ctx->inject_if_block($ctx->scope_injector_call . $method->injectable_code); |
118 | } |
119 | else { |
120 | $ctx->inject_code_parts_here( |
121 | sprintf '{ %s%s }', |
122 | $ctx->scope_injector_call, |
123 | $method->injectable_code, |
124 | ); |
125 | } |
126 | |
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127 | my $compile_attrs = sub { |
128 | my $attributes = shift;; |
129 | my @attributes; |
130 | |
131 | for my $attr (keys %$attributes) { |
132 | my $value = $attributes->{ $attr }; |
133 | |
134 | next if $attr eq 'Chained' and $value eq UNDER_VAR; |
135 | |
136 | # $value = sprintf "'%s'", $value |
137 | # if grep { $attr eq $_ } qw( Chained PathPart ); |
138 | |
139 | push @attributes, |
140 | map { sprintf '%s%s', $attr, defined($_) ? sprintf('(%s)', $_) : '' } |
141 | (ref($value) eq 'ARRAY') |
142 | ? @$value |
143 | : $value; |
144 | } |
145 | |
146 | return \@attributes; |
147 | }; |
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148 | |
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149 | return $ctx->shadow(sub { |
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150 | my $class = caller; |
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151 | my $attrs = shift; |
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152 | my $body = shift; |
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153 | |
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154 | $body = $attrs and $attrs = {} |
155 | if ref $attrs eq 'CODE'; |
156 | |
157 | delete $attrs->{Chained} |
158 | unless defined $attrs->{Chained}; |
159 | |
160 | defined($attrs->{ $_ }) and $attrs->{ $_ } = sprintf "'%s'", $attrs->{ $_ } |
161 | for qw( Chained PathPart ); |
162 | |
163 | # pp \%attributes; |
164 | # pp $attrs; |
165 | my %full_attrs = (%attributes, %$attrs); |
166 | # pp \%full_attrs; |
167 | my $compiled_attrs = $compile_attrs->(\%full_attrs); |
168 | # pp $compiled_attrs; |
169 | |
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170 | my $real_method = $method->reify( |
171 | actual_body => $body, |
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172 | attributes => $compiled_attrs, |
24a5fc45 |
173 | ); |
856ac9a7 |
174 | |
175 | if ($modifier) { |
176 | |
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177 | add_method_modifier $class, $modifier, [$name, $real_method]; |
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178 | } |
179 | else { |
180 | |
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181 | my $prepare_meta = sub { |
182 | my ($meta) = @_; |
183 | |
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184 | $meta->add_method($name, $real_method); |
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185 | $meta->register_method_attributes($meta->name->can($real_method->name), $compiled_attrs); |
c2a8165b |
186 | }; |
187 | |
188 | if ($ctx->stack->[-1] and $ctx->stack->[-1]->is_parameterized) { |
189 | my $real_meta = MooseX::Role::Parameterized->current_metaclass; |
190 | |
191 | $real_meta->meta->make_mutable |
192 | if $real_meta->meta->is_immutable; |
193 | ensure_all_roles $real_meta->meta, AttributeMetaRole |
194 | if $real_meta->isa('Moose::Meta::Role'); |
195 | |
196 | $real_meta->$prepare_meta; |
197 | } |
198 | |
199 | $class->meta->$prepare_meta; |
856ac9a7 |
200 | } |
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201 | }); |
202 | } |
203 | |
a1dd1788 |
204 | method _handle_with_option (Object $ctx, HashRef $attrs) { |
205 | |
206 | my $role = $ctx->strip_name |
207 | or croak "Expected bareword role specification for action after with"; |
208 | |
209 | # we need to fish for aliases here since we are still unclean |
210 | if (defined(my $alias = $self->_check_for_available_import($ctx, $role))) { |
211 | $role = $alias; |
212 | } |
213 | |
214 | push @{ $attrs->{CatalystX_Declarative_ActionRoles} ||= [] }, $role; |
215 | |
216 | return; |
217 | } |
218 | |
219 | method _handle_isa_option (Object $ctx, HashRef $attrs) { |
220 | |
221 | my $class = $ctx->strip_name |
222 | or croak "Expected bareword action class specification for action after isa"; |
223 | |
224 | if (defined(my $alias = $self->_check_for_available_import($ctx, $class))) { |
225 | $class = $alias; |
226 | } |
227 | |
228 | $attrs->{CatalystX_Declarative_ActionClass} = $class; |
229 | |
230 | return; |
231 | } |
232 | |
233 | method _check_for_available_import (Object $ctx, Str $name) { |
234 | |
235 | if (my $code = $ctx->get_curstash_name->can($name)) { |
236 | return $code->(); |
237 | } |
238 | |
239 | return undef; |
240 | } |
241 | |
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242 | method _handle_action_option (Object $ctx, HashRef $attrs) { |
243 | |
244 | # action name |
245 | my $name = $ctx->strip_name |
246 | or croak "Anonymous actions not yet supported"; |
247 | |
64baeca0 |
248 | $ctx->skipspace; |
249 | my $populator; |
250 | |
251 | if (substr($ctx->get_linestr, $ctx->offset, 2) eq '<-') { |
252 | my $linestr = $ctx->get_linestr; |
253 | substr($linestr, $ctx->offset, 2) = ''; |
254 | $ctx->set_linestr($linestr); |
255 | $populator = $self->_handle_under_option($ctx, $attrs); |
256 | } |
257 | |
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258 | # signature |
259 | my $proto = $ctx->strip_proto || ''; |
260 | $proto = join(', ', 'Object $self: Object $ctx', $proto || ()); |
261 | |
262 | $attrs->{Subname} = $name; |
263 | $attrs->{Signature} = $proto; |
aae7ad1f |
264 | $attrs->{Action} = []; |
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265 | |
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266 | push @{ $attrs->{CatalystX_Declarative_ActionRoles} ||= [] }, CatchValidationError; |
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267 | $attrs->{Chained} ||= UNDER_VAR; |
e10b92dd |
268 | |
64baeca0 |
269 | return unless $populator; |
270 | return $populator; |
918fb36e |
271 | } |
272 | |
2dde75e7 |
273 | method _handle_final_option (Object $ctx, HashRef $attrs) { |
274 | |
275 | return $self->_build_flag_populator($ctx, $attrs, 'final'); |
276 | } |
277 | |
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278 | method _handle_is_option (Object $ctx, HashRef $attrs) { |
279 | |
280 | my $what = $ctx->strip_name |
281 | or croak "Expected symbol token after is symbol, not " . substr($ctx->get_linestr, $ctx->offset); |
282 | |
2dde75e7 |
283 | return $self->_build_flag_populator($ctx, $attrs, $what); |
284 | } |
285 | |
286 | method _build_flag_populator (Object $ctx, HashRef $attrs, Str $what) { |
287 | |
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288 | return sub { |
289 | my $method = shift; |
290 | |
291 | if ($what eq any qw( end endpoint final )) { |
eb97acbb |
292 | $attrs->{Args} = delete $attrs->{CaptureArgs}; |
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293 | } |
294 | elsif ($what eq 'private') { |
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295 | $attrs->{Private} = []; |
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296 | } |
297 | }; |
298 | } |
299 | |
300 | method _handle_under_option (Object $ctx, HashRef $attrs) { |
301 | |
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302 | my $target = $self->_strip_actionpath($ctx, interpolate => 1); |
e10b92dd |
303 | $ctx->skipspace; |
304 | |
305 | if ($ctx->peek_next_char eq '{' and $self->identifier eq 'under') { |
306 | $ctx->inject_if_block( |
8d66ec34 |
307 | $ctx->scope_injector_call . |
308 | sprintf ';local %s = %s;', |
e10b92dd |
309 | UNDER_VAR, |
310 | $target, |
311 | ); |
312 | return STOP_PARSING; |
313 | } |
314 | |
8d66ec34 |
315 | $attrs->{Chained} = $target; |
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316 | |
317 | return sub { |
318 | my $method = shift; |
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319 | }; |
320 | } |
321 | |
322 | method _handle_chains_option (Object $ctx, HashRef $attrs) { |
323 | |
324 | $ctx->skipspace; |
325 | $ctx->strip_name eq 'to' |
326 | or croak "Expected to token after chains symbol, not " . substr($ctx->get_linestr, $ctx->offset); |
327 | |
328 | return $self->_handle_under_option($ctx, $attrs); |
329 | } |
330 | |
331 | method _handle_as_option (Object $ctx, HashRef $attrs) { |
332 | |
333 | $ctx->skipspace; |
334 | |
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335 | my $path = $self->_strip_actionpath($ctx, interpolate => 1); |
336 | $attrs->{PathPart} = $path; |
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337 | |
338 | return; |
339 | } |
340 | |
341 | method _count_positional_arguments (Object $method) { |
c2a8165b |
342 | my $signature = $method->parsed_signature; |
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343 | |
344 | if ($signature->has_positional_params) { |
345 | my $count = @{ scalar($signature->positional_params) }; |
346 | |
347 | if ($count and ($signature->positional_params)[-1]->sigil eq '@') { |
348 | return undef; |
349 | } |
350 | |
351 | return $count - 1; |
352 | } |
353 | |
354 | return 0; |
355 | } |
356 | |
8d66ec34 |
357 | method _inject_attributes (Object $ctx, HashRef $attrs) { |
358 | |
359 | my @inject = qw( Chained PathPart ); |
360 | |
361 | my $code = sprintf ' +{ %s }, sub ', |
362 | join ', ', |
363 | map { (@$_) } |
364 | # map { [$_->[0], sprintf '"%s"', $_->[1]] } |
365 | # map { length( $_->[1] ) ? $_ : [$_->[0], "''"] } |
366 | map { defined( $_->[1] ) ? $_ : [$_->[0], 'undef'] } |
367 | map { [pp($_), $attrs->{ $_ }] } |
368 | grep { defined $attrs->{ $_ } } |
369 | @inject; |
370 | |
371 | $ctx->inject_code_parts_here($code); |
372 | $ctx->inc_offset(length $code); |
373 | } |
374 | |
375 | method _strip_actionpath (Object $ctx, :$interpolate?) { |
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376 | |
377 | $ctx->skipspace; |
378 | my $linestr = $ctx->get_linestr; |
379 | my $rest = substr($linestr, $ctx->offset); |
8d66ec34 |
380 | my $interp = sub { $interpolate ? "'$_[0]'" : $_[0] }; |
918fb36e |
381 | |
382 | if ($rest =~ /^ ( [_a-z] [_a-z0-9]* ) \b/ix) { |
383 | substr($linestr, $ctx->offset, length($1)) = ''; |
384 | $ctx->set_linestr($linestr); |
8d66ec34 |
385 | return $interp->($1); |
918fb36e |
386 | } |
a0ebba1d |
387 | elsif ($rest =~ /^ ' ( (?:[.:;,_a-z0-9]|\/)* ) ' /ix) { |
918fb36e |
388 | substr($linestr, $ctx->offset, length($1) + 2) = ''; |
389 | $ctx->set_linestr($linestr); |
8d66ec34 |
390 | return $interp->($1); |
391 | } |
392 | elsif ($interpolate and my $str = $ctx->get_string) { |
393 | return $str; |
918fb36e |
394 | } |
395 | else { |
396 | croak "Invalid syntax for action path: $rest"; |
397 | } |
398 | } |
8d66ec34 |
399 | |
400 | with 'MooseX::Declare::Syntax::KeywordHandling'; |
401 | |
402 | around context_traits { $self->$orig, StringParsing } |
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403 | } |
404 | |
856ac9a7 |
405 | __END__ |
406 | |
407 | =head1 NAME |
408 | |
409 | CatalystX::Declare::Keyword::Action - Declare Catalyst Actions |
410 | |
411 | =head1 SYNOPSIS |
412 | |
413 | use CatalystX::Declare; |
414 | |
415 | controller MyApp::Web::Controller::Example { |
416 | |
417 | # chain base action with path part setting of '' |
418 | # body-less actions don't do anything by themselves |
6e2492a4 |
419 | action base as '' under '/'; |
856ac9a7 |
420 | |
421 | # simple end-point action |
422 | action controller_class is final under base { |
423 | $ctx->response->body( 'controller: ' . ref $self ); |
424 | } |
425 | |
426 | # chain part actions can have arguments |
427 | action str (Str $string) under base { |
428 | |
429 | $ctx->stash(chars => [split //, $string]); |
430 | } |
431 | |
432 | # and end point actions too, of course |
433 | action uc_chars (Int $count) under str is final { |
434 | |
435 | my $chars = $ctx->stash->{chars}; |
436 | ... |
437 | } |
438 | |
439 | |
440 | # you can use a shortcut for multiple actions with |
441 | # a common base |
442 | under base { |
443 | |
444 | # this is an endpoint after base |
445 | action normal is final; |
446 | |
447 | # the final keyword can be used to be more |
448 | # visually explicit about end-points |
449 | final action some_action { ... } |
ed4a2203 |
450 | |
451 | # type dispatching works |
452 | final action with_str (Str $x) as via_type; |
453 | final action with_int (Int $x) as via_type; |
856ac9a7 |
454 | } |
455 | |
456 | # of course you can also chain to external actions |
457 | final action some_end under '/some/controller/some/action'; |
458 | } |
459 | |
460 | =head1 DESCRIPTION |
461 | |
462 | This handler class provides the user with C<action>, C<final> and C<under> |
463 | keywords. There are multiple ways to define actions to allow for greater |
464 | freedom of expression. While the parts of the action declaration itself do |
465 | not care about their order, their syntax is rather strict. |
466 | |
467 | You can choose to separate syntax elements via C<,> if you think it is more |
468 | readable. The action declaration |
469 | |
470 | action foo is final under base; |
471 | |
472 | is parsed in exactly the same way if you write it as |
473 | |
474 | action foo, is final, under base; |
475 | |
476 | =head2 Basic Action Declaration |
477 | |
478 | The simplest possible declaration is |
479 | |
480 | action foo; |
481 | |
6e2492a4 |
482 | This would define a chain-part action chained to nothing with the name C<foo> |
856ac9a7 |
483 | and no arguments. Since it isn't followed by a block, the body of the action |
484 | will be empty. |
485 | |
486 | You will automatically be provided with two variables: C<$self> is, as you |
487 | might expect, your controller instance. C<$ctx> will be the Catalyst context |
488 | object. Thus, the following code would stash the value returned by the |
489 | C<get_item> method: |
490 | |
491 | action foo { |
492 | $ctx->stash(item => $self->get_item); |
493 | } |
494 | |
32663314 |
495 | =head2 Why $ctx instead of $c |
496 | |
497 | Some might ask why the context object is called C<$ctx> instead of the usual |
498 | C<$c>. The reason is simple: It's an opinionated best practice, since C<$ctx> |
499 | stands out more. |
500 | |
856ac9a7 |
501 | =head2 Setting a Path Part |
502 | |
503 | As usual with Catalyst actions, the path part (the public name of this part of |
504 | the URI, if you're not familiar with the term yet) will default to the name of |
505 | the action itself (or more correctly: to whatever Catalyst defaults). |
506 | |
507 | To change that, use the C<as> option: |
508 | |
6e2492a4 |
509 | under something { |
510 | action base as ''; # <empty> |
511 | action something as 'foo/bar'; # foo/bar |
512 | action barely as bareword; # bareword |
513 | } |
856ac9a7 |
514 | |
515 | =head2 Chaining Actions |
516 | |
517 | Currently, L<CatalystX::Declare> is completely based on the concept of |
518 | L<chained actions|Catalyst::DispatchType::Chained>. Every action you declare is |
6e2492a4 |
519 | chained or private. You can specify the action you want to chain to with the |
520 | C<under> option: |
856ac9a7 |
521 | |
6e2492a4 |
522 | action foo; # chained to nothing |
856ac9a7 |
523 | action foo under '/'; # also chained to / |
524 | action foo under bar; # chained to the local bar action |
525 | action foo under '/bar/baz'; # chained to baz in /bar |
526 | |
527 | C<under> is also provided as a grouping keyword. Every action inside the block |
528 | will be chained to the specified action: |
529 | |
530 | under base { |
531 | action foo { ... } |
532 | action bar { ... } |
533 | } |
534 | |
535 | You can also use the C<under> keyword for a single action. This is useful if |
536 | you want to highlight a single action with a significant diversion from what |
537 | is to be expected: |
538 | |
6e2492a4 |
539 | action base under '/'; |
856ac9a7 |
540 | |
541 | under '/the/sink' is final action foo; |
542 | |
543 | final action bar under base; |
544 | |
545 | final action baz under base; |
546 | |
547 | Instead of the C<under> option declaration, you can also use a more english |
548 | variant named C<chains to>. While C<under> might be nice and concise, some |
549 | people might prefer this if they confuse C<under> with the specification of |
550 | a public path part. The argument to C<chains to> is the same as to C<under>: |
551 | |
552 | action foo chains to bar; |
553 | action foo under bar; |
554 | |
555 | By default all actions are chain-parts, not end-points. If you want an action |
556 | to be picked up as end-point and available via a public path, you have to say |
557 | so explicitely by using the C<is final> option: |
558 | |
6e2492a4 |
559 | action base under '/'; |
856ac9a7 |
560 | action foo under base is final; # /base/foo |
561 | |
562 | You can also drop the C<is> part of the C<is final> option if you want: |
563 | |
564 | under base, final action foo { ... } |
565 | |
566 | You can make end-points more visually distinct by using the C<final> keyword |
567 | instead of the option: |
568 | |
6e2492a4 |
569 | action base under '/'; |
856ac9a7 |
570 | final action foo under base; # /base/foo |
571 | |
572 | And of course, the C<final>, C<under> and C<action> keywords can be used in |
573 | combination whenever needed: |
574 | |
6e2492a4 |
575 | action base as '' under '/'; |
856ac9a7 |
576 | |
577 | under base { |
578 | |
579 | final action list; # /list |
580 | |
581 | action load; |
582 | |
583 | under load { |
584 | |
585 | final action view; # /list/load/view |
586 | final action edit; # /list/load/edit |
587 | } |
588 | } |
589 | |
590 | There is also one shorthand alternative for declaring chain targets. You can |
591 | specify an action after a C<E<lt>-> following the action name: |
592 | |
6e2492a4 |
593 | action base under '/'; |
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594 | final action foo <- base; # /base/foo |
595 | |
596 | =head2 Arguments |
597 | |
598 | You can use signatures like you are use to from L<MooseX::Method::Signatures> |
ed4a2203 |
599 | to declare action parameters. The number of positinoal arguments will be used |
600 | during dispatching as well as their types. |
856ac9a7 |
601 | |
602 | The signature follows the action name: |
603 | |
604 | # /foo/*/*/* |
605 | final action foo (Int $year, Int $month, Int $day); |
606 | |
607 | If you are using the shorthand definition, the signature follows the chain |
608 | target: |
609 | |
610 | # /foo/* |
6e2492a4 |
611 | final action foo <- base ($x) under '/' { ... } |
856ac9a7 |
612 | |
613 | Parameters may be specified on chain-parts and end-points: |
614 | |
615 | # /base/*/foo/* |
6e2492a4 |
616 | action base (Str $lang) under '/'; |
856ac9a7 |
617 | final action page (Int $page_num) under base; |
618 | |
619 | Named parameters will be populated with the values in the query parameters: |
620 | |
621 | # /view/17/?page=3 |
6e2492a4 |
622 | final action view (Int $id, Int :$page = 1) under '/'; |
856ac9a7 |
623 | |
624 | Your end-points can also take an unspecified amount of arguments by specifying |
625 | an array as a variable: |
626 | |
627 | # /find/some/deep/path/spec |
6e2492a4 |
628 | final action find (@path) under '/'; |
856ac9a7 |
629 | |
5fb5cef1 |
630 | =head2 Validation |
631 | |
ed4a2203 |
632 | The signatures are now validated during dispatching-time, and an action with |
633 | a non-matching signature (number of positional arguments and their types) will |
634 | not be dispatched to. This means that |
635 | |
636 | action base under '/' as ''; |
637 | |
638 | under base { |
639 | |
ed4a2203 |
640 | final as double, action double_integer (Int $x) { |
641 | $ctx->response->body( $x * 2 ); |
642 | } |
aee1c364 |
643 | |
644 | final as double, action double_string (Str $x) { |
645 | $ctx->response->body( $x x 2 ); |
646 | } |
ed4a2203 |
647 | } |
648 | |
649 | will return C<foofoo> when called as C</double/foo> and C<46> when called as |
650 | C</double/23>. |
5fb5cef1 |
651 | |
856ac9a7 |
652 | =head2 Actions and Method Modifiers |
653 | |
654 | Method modifiers can not only be applied to methods, but also to actions. There |
655 | is no way yet to override the attributes of an already established action via |
656 | modifiers. However, you can modify the method underlying the action. |
657 | |
658 | The following code is an example role modifying the consuming controller's |
659 | C<base> action: |
660 | |
661 | use CatalystX::Declare; |
662 | |
205323ac |
663 | controller_role MyApp::Web::ControllerRole::RichBase { |
856ac9a7 |
664 | |
665 | before base (Object $ctx) { |
666 | $ctx->stash(something => $ctx->model('Item')); |
667 | } |
668 | } |
669 | |
670 | Note that you have to specify the C<$ctx> argument yourself, since you are |
671 | modifying a method, not an action. |
672 | |
673 | Any controller having a C<base> action (or method, for this purpose), can now |
674 | consume the C<RichBase> role declared above: |
675 | |
676 | use CatalystX::Declare; |
677 | |
678 | controller MyApp::Web::Controller::Foo |
679 | with MyApp::Web::Controller::RichBase { |
680 | |
6e2492a4 |
681 | action base as '' under '/'; |
856ac9a7 |
682 | |
683 | action show, final under base { |
684 | $ctx->response->body( |
685 | $ctx->stash->{something}->render, |
686 | ); |
687 | } |
688 | } |
689 | |
2bb54af3 |
690 | =head2 Action Classes |
691 | |
692 | B<This option is even more experimental> |
693 | |
694 | You might want to create an action with a different class than the usual |
695 | L<Catalyst::Action>. A usual suspect here is L<Catalyst::Action::RenderView>. |
696 | You can use the C<isa> option (did I mention it's experimental?) to specify |
697 | what class to use: |
698 | |
699 | controller MyApp::Web::Controller::Root { |
700 | |
701 | $CLASS->config(namespace => ''); |
702 | |
703 | action end isa RenderView; |
704 | } |
705 | |
706 | The loaded class will be L<Moose>ified, so we are able to apply essential |
707 | roles. |
708 | |
856ac9a7 |
709 | =head1 ROLES |
710 | |
711 | =over |
712 | |
713 | =item L<MooseX::Declare::Syntax::KeywordHandling> |
714 | |
715 | =back |
716 | |
717 | =head1 METHODS |
718 | |
719 | These methods are implementation details. Unless you are extending or |
720 | developing L<CatalystX::Declare>, you should not be concerned with them. |
721 | |
722 | =head2 parse |
723 | |
724 | Object->parse (Object $ctx, Str :$modifier?, Int :$skipped_declarator = 0) |
725 | |
726 | A hook that will be invoked by L<MooseX::Declare> when this instance is called |
727 | to handle syntax. It will parse the action declaration, prepare attributes and |
728 | add the actions to the controller. |
729 | |
730 | =head1 SEE ALSO |
731 | |
732 | =over |
733 | |
734 | =item L<CatalystX::Declare> |
735 | |
736 | =item L<CatalystX::Declare::Keyword::Controller> |
737 | |
738 | =item L<MooseX::Method::Signatures> |
739 | |
740 | =back |
741 | |
742 | =head1 AUTHOR |
743 | |
744 | See L<CatalystX::Declare/AUTHOR> for author information. |
745 | |
746 | =head1 LICENSE |
747 | |
748 | This program is free software; you can redistribute it and/or modify it under |
749 | the same terms as perl itself. |
918fb36e |
750 | |
856ac9a7 |
751 | =cut |
918fb36e |
752 | |