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1 | package ## Hide from PAUSE |
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2 | MooseX::Dependent::Meta::TypeConstraint::Dependent; |
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3 | |
4 | use Moose; |
5 | use Moose::Util::TypeConstraints (); |
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6 | use MooseX::Dependent::Meta::TypeCoercion::Dependent; |
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7 | use Scalar::Util qw(blessed); |
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8 | use Data::Dump; |
9 | use Digest::MD5; |
10 | |
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11 | extends 'Moose::Meta::TypeConstraint'; |
12 | |
13 | =head1 NAME |
14 | |
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15 | MooseX::Dependent::Meta::TypeConstraint::Dependent - Metaclass for Dependent type constraints. |
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16 | |
17 | =head1 DESCRIPTION |
18 | |
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19 | see L<MooseX::Dependent> for examples and details of how to use dependent |
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20 | types. This class is a subclass of L<Moose::Meta::TypeConstraint> which |
21 | provides the gut functionality to enable dependent type constraints. |
22 | |
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23 | This class is not intended for public consumption. Please don't subclass it |
24 | or rely on it. Chances are high stuff here is going to change a lot. For |
25 | example, I will probably refactor this into several classes to get rid of all |
26 | the ugly conditionals. |
27 | |
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28 | =head1 ATTRIBUTES |
29 | |
30 | This class defines the following attributes. |
31 | |
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32 | =head2 parent_type_constraint |
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33 | |
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34 | The type constraint whose validity is being made dependent. |
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35 | |
36 | =cut |
37 | |
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38 | has 'parent_type_constraint' => ( |
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39 | is=>'ro', |
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40 | isa=>'Object', |
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41 | default=> sub { |
42 | Moose::Util::TypeConstraints::find_type_constraint("Any"); |
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43 | }, |
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44 | required=>1, |
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45 | ); |
46 | |
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47 | |
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48 | =head2 constraining_value_type_constraint |
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49 | |
50 | This is a type constraint which defines what kind of value is allowed to be the |
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51 | constraining value of the dependent type. |
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52 | |
53 | =cut |
54 | |
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55 | has 'constraining_value_type_constraint' => ( |
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56 | is=>'ro', |
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57 | isa=>'Object', |
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58 | default=> sub { |
59 | Moose::Util::TypeConstraints::find_type_constraint("Any"); |
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60 | }, |
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61 | required=>1, |
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62 | ); |
63 | |
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64 | =head2 constraining_value |
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65 | |
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66 | This is the actual value that constraints the L</parent_type_constraint> |
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67 | |
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68 | =cut |
69 | |
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70 | has 'constraining_value' => ( |
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71 | is=>'ro', |
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72 | predicate=>'has_constraining_value', |
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73 | ); |
74 | |
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75 | =head1 METHODS |
76 | |
77 | This class defines the following methods. |
78 | |
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79 | =head2 BUILD |
80 | |
81 | Do some post build stuff |
82 | |
83 | =cut |
84 | |
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85 | ## Right now I add in the dependent type coercion until I can merge some Moose |
86 | ## changes upstream |
87 | |
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88 | around 'new' => sub { |
89 | my ($new, $class, @args) = @_; |
90 | my $self = $class->$new(@args); |
91 | my $coercion = MooseX::Dependent::Meta::TypeCoercion::Dependent->new(type_constraint => $self); |
92 | $self->coercion($coercion); |
93 | return $self; |
94 | }; |
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95 | |
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96 | =head2 parameterize (@args) |
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97 | |
98 | Given a ref of type constraints, create a structured type. |
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99 | |
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100 | =cut |
101 | |
102 | sub parameterize { |
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103 | my $self = shift @_; |
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104 | my $class = ref $self; |
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105 | |
106 | Moose->throw_error("$self already has a constraining value.") if |
107 | $self->has_constraining_value; |
108 | |
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109 | if(blessed $_[0] && $_[0]->isa('Moose::Meta::TypeConstraint')) { |
110 | my $arg1 = shift @_; |
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111 | |
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112 | if(blessed $_[0] && $_[0]->isa('Moose::Meta::TypeConstraint')) { |
113 | my $arg2 = shift @_ || $self->constraining_value_type_constraint; |
114 | |
115 | ## TODO fix this crap! |
116 | Moose->throw_error("$arg2 is not a type constraint") |
117 | unless $arg2->isa('Moose::Meta::TypeConstraint'); |
118 | |
119 | Moose->throw_error("$arg1 is not a type of: ".$self->parent_type_constraint->name) |
120 | unless $arg1->is_a_type_of($self->parent_type_constraint); |
121 | |
122 | Moose->throw_error("$arg2 is not a type of: ".$self->constraining_value_type_constraint->name) |
123 | unless $arg2->is_a_type_of($self->constraining_value_type_constraint); |
124 | |
125 | Moose->throw_error('Too Many Args! Two are allowed.') if @_; |
126 | |
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127 | my $name = $self->_generate_subtype_name($arg1, $arg2); |
128 | if(my $exists = Moose::Util::TypeConstraints::find_type_constraint($name)) { |
129 | return $exists; |
130 | } else { |
131 | my $type_constraint = $class->new( |
132 | name => $name, |
133 | parent => $self, |
134 | constraint => $self->constraint, |
135 | parent_type_constraint=>$arg1, |
136 | constraining_value_type_constraint => $arg2, |
137 | ); |
138 | Moose::Util::TypeConstraints::get_type_constraint_registry->add_type_constraint($type_constraint); |
139 | return $type_constraint; |
140 | } |
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141 | } else { |
142 | Moose->throw_error("$arg1 is not a type of: ".$self->constraining_value_type_constraint->name) |
143 | unless $arg1->is_a_type_of($self->constraining_value_type_constraint); |
144 | |
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145 | my $name = $self->_generate_subtype_name($self->parent_type_constraint, $arg1); |
146 | if(my $exists = Moose::Util::TypeConstraints::find_type_constraint($name)) { |
147 | return $exists; |
148 | } else { |
149 | my $type_constraint = $class->new( |
150 | name => $name, |
151 | parent => $self, |
152 | constraint => $self->constraint, |
153 | parent_type_constraint=>$self->parent_type_constraint, |
154 | constraining_value_type_constraint => $arg1, |
155 | ); |
156 | Moose::Util::TypeConstraints::get_type_constraint_registry->add_type_constraint($type_constraint); |
157 | return $type_constraint; |
158 | } |
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159 | } |
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160 | } else { |
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161 | my $args; |
162 | ## Jump through some hoops to let them do tc[key=>10] and tc[{key=>10}] |
163 | if(@_) { |
164 | if($#_) { |
165 | if($self->constraining_value_type_constraint->is_a_type_of('HashRef')) { |
166 | $args = {@_}; |
167 | } else { |
168 | $args = [@_]; |
169 | } |
170 | } else { |
171 | $args = $_[0]; |
172 | } |
173 | |
174 | } else { |
175 | ## TODO: Is there a use case for parameterizing null or undef? |
176 | Moose->throw_error('Cannot Parameterize null values.'); |
177 | } |
178 | |
179 | if(my $err = $self->constraining_value_type_constraint->validate($args)) { |
180 | Moose->throw_error($err); |
181 | } else { |
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182 | |
183 | my $sig = $args; |
184 | if(ref $sig) { |
185 | $sig = Digest::MD5::md5_hex(Data::Dump::dump($args)); |
186 | } |
187 | my $name = $self->name."[$sig]"; |
188 | if(my $exists = Moose::Util::TypeConstraints::find_type_constraint($name)) { |
189 | return $exists; |
190 | } else { |
191 | my $type_constraint = $class->new( |
192 | name => $name, |
193 | parent => $self, |
194 | constraint => $self->constraint, |
195 | constraining_value => $args, |
196 | parent_type_constraint=>$self->parent_type_constraint, |
197 | constraining_value_type_constraint => $self->constraining_value_type_constraint, |
198 | ); |
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199 | |
200 | ## TODO This is probably going to have to go away (too many things added to the registry) |
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201 | ##Moose::Util::TypeConstraints::get_type_constraint_registry->add_type_constraint($type_constraint); |
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202 | return $type_constraint; |
203 | } |
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204 | } |
205 | } |
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206 | } |
207 | |
208 | =head2 _generate_subtype_name |
209 | |
210 | Returns a name for the dependent type that should be unique |
211 | |
212 | =cut |
213 | |
214 | sub _generate_subtype_name { |
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215 | my ($self, $parent_tc, $constraining_tc) = @_; |
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216 | return sprintf( |
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217 | $self."[%s, %s]", |
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218 | $parent_tc, $constraining_tc, |
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219 | ); |
220 | } |
221 | |
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222 | =head2 create_child_type |
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223 | |
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224 | modifier to make sure we get the constraint_generator |
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225 | |
226 | =cut |
227 | |
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228 | around 'create_child_type' => sub { |
229 | my ($create_child_type, $self, %opts) = @_; |
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230 | if($self->has_constraining_value) { |
231 | $opts{constraining_value} = $self->constraining_value; |
232 | } |
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233 | return $self->$create_child_type( |
234 | %opts, |
235 | parent=> $self, |
236 | parent_type_constraint=>$self->parent_type_constraint, |
237 | constraining_value_type_constraint => $self->constraining_value_type_constraint, |
238 | ); |
239 | }; |
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240 | |
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241 | =head2 equals ($type_constraint) |
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242 | |
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243 | Override the base class behavior so that a dependent type equal both the parent |
244 | type and the overall dependent container. This behavior may change if we can |
245 | figure out what a dependent type is (multiply inheritance or a role...) |
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246 | |
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247 | =cut |
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248 | |
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249 | around 'equals' => sub { |
250 | my ( $equals, $self, $type_or_name ) = @_; |
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251 | |
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252 | my $other = defined $type_or_name ? |
253 | Moose::Util::TypeConstraints::find_type_constraint($type_or_name) : |
254 | Moose->throw_error("Can't call $self ->equals without a parameter"); |
255 | |
256 | Moose->throw_error("$type_or_name is not a registered Type") |
257 | unless $other; |
258 | |
259 | if(my $parent = $other->parent) { |
260 | return $self->$equals($other) |
261 | || $self->parent->equals($parent); |
262 | } else { |
263 | return $self->$equals($other); |
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264 | } |
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265 | }; |
266 | |
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267 | =head2 is_subtype_of |
268 | |
269 | Method modifier to make sure we match on subtype for both the dependent type |
270 | as well as the type being made dependent |
271 | |
272 | =cut |
273 | |
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274 | around 'is_subtype_of' => sub { |
275 | my ( $is_subtype_of, $self, $type_or_name ) = @_; |
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276 | |
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277 | my $other = defined $type_or_name ? |
278 | Moose::Util::TypeConstraints::find_type_constraint($type_or_name) : |
279 | Moose->throw_error("Can't call $self ->equals without a parameter"); |
280 | |
281 | Moose->throw_error("$type_or_name is not a registered Type") |
282 | unless $other; |
283 | |
284 | return $self->$is_subtype_of($other) |
285 | || $self->parent_type_constraint->is_subtype_of($other); |
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286 | |
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287 | }; |
288 | |
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289 | =head2 check |
290 | |
291 | As with 'is_subtype_of', we need to dual dispatch the method request |
292 | |
293 | =cut |
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294 | |
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295 | around 'check' => sub { |
296 | my ($check, $self, @args) = @_; |
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297 | return ( |
298 | $self->parent_type_constraint->check(@args) && |
299 | $self->$check(@args) |
300 | ); |
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301 | }; |
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302 | |
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303 | =head2 validate |
304 | |
305 | As with 'is_subtype_of', we need to dual dispatch the method request |
306 | |
307 | =cut |
308 | |
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309 | around 'validate' => sub { |
310 | my ($validate, $self, @args) = @_; |
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311 | return ( |
312 | $self->parent_type_constraint->validate(@args) || |
313 | $self->$validate(@args) |
314 | ); |
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315 | }; |
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316 | |
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317 | =head2 _compiled_type_constraint |
318 | |
319 | modify this method so that we pass along the constraining value to the constraint |
320 | coderef and also throw the correct error message if the constraining value does |
321 | not match it's requirement. |
322 | |
323 | =cut |
324 | |
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325 | around '_compiled_type_constraint' => sub { |
326 | my ($method, $self, @args) = @_; |
327 | my $coderef = $self->$method(@args); |
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328 | my $constraining; |
329 | if($self->has_constraining_value) { |
330 | $constraining = $self->constraining_value; |
331 | } |
332 | |
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333 | return sub { |
334 | my @local_args = @_; |
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335 | if(my $err = $self->constraining_value_type_constraint->validate($constraining)) { |
336 | Moose->throw_error($err); |
337 | } |
338 | $coderef->(@local_args, $constraining); |
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339 | }; |
340 | }; |
341 | |
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342 | =head2 coerce |
343 | |
344 | More method modification to support dispatch coerce to a parent. |
345 | |
346 | =cut |
347 | |
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348 | around 'coerce' => sub { |
349 | my ($coerce, $self, @args) = @_; |
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350 | |
351 | if($self->has_constraining_value) { |
352 | push @args, $self->constraining_value; |
353 | if(@{$self->coercion->type_coercion_map}) { |
354 | my $coercion = $self->coercion; |
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355 | my $coerced = $self->$coerce(@args); |
356 | if(defined $coerced) { |
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357 | return $coerced; |
358 | } else { |
359 | my $parent = $self->parent; |
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360 | return $parent->coerce(@args); |
361 | } |
362 | } else { |
363 | my $parent = $self->parent; |
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364 | return $parent->coerce(@args); |
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365 | } |
366 | } |
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367 | else { |
368 | return $self->$coerce(@args); |
369 | } |
370 | return; |
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371 | }; |
372 | |
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373 | =head2 get_message |
374 | |
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375 | Give you a better peek into what's causing the error. |
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376 | |
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377 | around 'get_message' => sub { |
378 | my ($get_message, $self, $value) = @_; |
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379 | return $self->$get_message($value); |
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380 | }; |
381 | |
382 | =head1 SEE ALSO |
383 | |
384 | The following modules or resources may be of interest. |
385 | |
386 | L<Moose>, L<Moose::Meta::TypeConstraint> |
387 | |
388 | =head1 AUTHOR |
389 | |
390 | John Napiorkowski, C<< <jjnapiork@cpan.org> >> |
391 | |
392 | =head1 COPYRIGHT & LICENSE |
393 | |
394 | This program is free software; you can redistribute it and/or modify |
395 | it under the same terms as Perl itself. |
396 | |
397 | =cut |
398 | |
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399 | 1; |
400 | ##__PACKAGE__->meta->make_immutable(inline_constructor => 0); |
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401 | |