Commit | Line | Data |
4e036ee4 |
1 | |
2 | package Moose::Meta::TypeConstraint; |
3 | |
4 | use strict; |
5 | use warnings; |
6 | use metaclass; |
7 | |
900466d6 |
8 | use overload '""' => sub { shift->name }, # stringify to tc name |
9 | fallback => 1; |
10 | |
c07af9d2 |
11 | use Sub::Name 'subname'; |
12 | use Carp 'confess'; |
13 | use Scalar::Util 'blessed'; |
66811d63 |
14 | |
d67145ed |
15 | our $VERSION = '0.09'; |
d44714be |
16 | our $AUTHORITY = 'cpan:STEVAN'; |
66811d63 |
17 | |
8ee73eeb |
18 | use Moose::Meta::TypeConstraint::Union; |
d67145ed |
19 | use Moose::Meta::TypeConstraint::Container; |
8ee73eeb |
20 | |
66811d63 |
21 | __PACKAGE__->meta->add_attribute('name' => (reader => 'name' )); |
22 | __PACKAGE__->meta->add_attribute('parent' => (reader => 'parent' )); |
d67145ed |
23 | __PACKAGE__->meta->add_attribute('constraint' => ( |
24 | reader => 'constraint', |
25 | writer => '_set_constraint', |
26 | )); |
76d37e5a |
27 | __PACKAGE__->meta->add_attribute('message' => ( |
28 | accessor => 'message', |
29 | predicate => 'has_message' |
30 | )); |
a27aa600 |
31 | __PACKAGE__->meta->add_attribute('coercion' => ( |
32 | accessor => 'coercion', |
33 | predicate => 'has_coercion' |
34 | )); |
66811d63 |
35 | |
36 | # private accessor |
37 | __PACKAGE__->meta->add_attribute('compiled_type_constraint' => ( |
38 | accessor => '_compiled_type_constraint' |
39 | )); |
40 | |
c8cf9aaa |
41 | __PACKAGE__->meta->add_attribute('hand_optimized_type_constraint' => ( |
42 | init_arg => 'optimized', |
43 | accessor => 'hand_optimized_type_constraint', |
44 | predicate => 'has_hand_optimized_type_constraint', |
45 | )); |
46 | |
66811d63 |
47 | sub new { |
a27aa600 |
48 | my $class = shift; |
49 | my $self = $class->meta->new_object(@_); |
66811d63 |
50 | $self->compile_type_constraint(); |
51 | return $self; |
52 | } |
53 | |
0a5bd159 |
54 | sub coerce { |
55 | ((shift)->coercion || confess "Cannot coerce without a type coercion")->coerce(@_) |
56 | } |
57 | |
43123819 |
58 | sub _collect_all_parents { |
59 | my $self = shift; |
60 | my @parents; |
61 | my $current = $self->parent; |
62 | while (defined $current) { |
c8cf9aaa |
63 | push @parents => $current; |
43123819 |
64 | $current = $current->parent; |
65 | } |
66 | return @parents; |
67 | } |
68 | |
451c8248 |
69 | sub compile_type_constraint { |
a27aa600 |
70 | my $self = shift; |
c8cf9aaa |
71 | |
72 | if ($self->has_hand_optimized_type_constraint) { |
73 | my $type_constraint = $self->hand_optimized_type_constraint; |
74 | $self->_compiled_type_constraint(sub { |
75 | return undef unless $type_constraint->($_[0]); |
76 | return 1; |
77 | }); |
78 | return; |
79 | } |
80 | |
a27aa600 |
81 | my $check = $self->constraint; |
66811d63 |
82 | (defined $check) |
83 | || confess "Could not compile type constraint '" . $self->name . "' because no constraint check"; |
84 | my $parent = $self->parent; |
85 | if (defined $parent) { |
43123819 |
86 | # we have a subtype ... |
87 | # so we gather all the parents in order |
88 | # and grab their constraints ... |
c8cf9aaa |
89 | my @parents; |
90 | foreach my $parent ($self->_collect_all_parents) { |
91 | if ($parent->has_hand_optimized_type_constraint) { |
92 | unshift @parents => $parent->hand_optimized_type_constraint; |
93 | last; |
94 | } |
95 | else { |
96 | unshift @parents => $parent->constraint; |
97 | } |
98 | } |
99 | |
43123819 |
100 | # then we compile them to run without |
101 | # having to recurse as we did before |
66811d63 |
102 | $self->_compiled_type_constraint(subname $self->name => sub { |
103 | local $_ = $_[0]; |
43123819 |
104 | foreach my $parent (@parents) { |
105 | return undef unless $parent->($_[0]); |
106 | } |
107 | return undef unless $check->($_[0]); |
5a4c5493 |
108 | 1; |
c8cf9aaa |
109 | }); |
66811d63 |
110 | } |
111 | else { |
a27aa600 |
112 | # we have a type .... |
66811d63 |
113 | $self->_compiled_type_constraint(subname $self->name => sub { |
114 | local $_ = $_[0]; |
115 | return undef unless $check->($_[0]); |
5a4c5493 |
116 | 1; |
66811d63 |
117 | }); |
118 | } |
119 | } |
120 | |
a27aa600 |
121 | sub check { $_[0]->_compiled_type_constraint->($_[1]) } |
4e036ee4 |
122 | |
76d37e5a |
123 | sub validate { |
124 | my ($self, $value) = @_; |
125 | if ($self->_compiled_type_constraint->($value)) { |
126 | return undef; |
127 | } |
128 | else { |
129 | if ($self->has_message) { |
130 | local $_ = $value; |
131 | return $self->message->($value); |
132 | } |
133 | else { |
451c8248 |
134 | return "Validation failed for '" . $self->name . "' failed"; |
76d37e5a |
135 | } |
136 | } |
137 | } |
138 | |
b26e162e |
139 | sub is_a_type_of { |
140 | my ($self, $type_name) = @_; |
141 | ($self->name eq $type_name || $self->is_subtype_of($type_name)); |
142 | } |
143 | |
cce8198b |
144 | sub is_subtype_of { |
145 | my ($self, $type_name) = @_; |
146 | my $current = $self; |
147 | while (my $parent = $current->parent) { |
148 | return 1 if $parent->name eq $type_name; |
149 | $current = $parent; |
150 | } |
151 | return 0; |
152 | } |
153 | |
451c8248 |
154 | sub union { |
155 | my ($class, @type_constraints) = @_; |
c07af9d2 |
156 | (scalar @type_constraints >= 2) |
157 | || confess "You must pass in at least 2 Moose::Meta::TypeConstraint instances to make a union"; |
158 | (blessed($_) && $_->isa('Moose::Meta::TypeConstraint')) |
159 | || confess "You must pass in only Moose::Meta::TypeConstraint instances to make unions" |
160 | foreach @type_constraints; |
451c8248 |
161 | return Moose::Meta::TypeConstraint::Union->new( |
0a5bd159 |
162 | type_constraints => \@type_constraints, |
451c8248 |
163 | ); |
164 | } |
165 | |
4e036ee4 |
166 | 1; |
167 | |
168 | __END__ |
169 | |
170 | =pod |
171 | |
172 | =head1 NAME |
173 | |
6ba6d68c |
174 | Moose::Meta::TypeConstraint - The Moose Type Constraint metaclass |
4e036ee4 |
175 | |
176 | =head1 DESCRIPTION |
177 | |
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178 | For the most part, the only time you will ever encounter an |
179 | instance of this class is if you are doing some serious deep |
180 | introspection. This API should not be considered final, but |
181 | it is B<highly unlikely> that this will matter to a regular |
182 | Moose user. |
183 | |
184 | If you wish to use features at this depth, please come to the |
185 | #moose IRC channel on irc.perl.org and we can talk :) |
186 | |
4e036ee4 |
187 | =head1 METHODS |
188 | |
189 | =over 4 |
190 | |
191 | =item B<meta> |
192 | |
193 | =item B<new> |
194 | |
b26e162e |
195 | =item B<is_a_type_of ($type_name)> |
196 | |
197 | This checks the current type name, and if it does not match, |
198 | checks if it is a subtype of it. |
199 | |
200 | =item B<is_subtype_of ($type_name)> |
cce8198b |
201 | |
6ba6d68c |
202 | =item B<compile_type_constraint> |
203 | |
0a5bd159 |
204 | =item B<coerce ($value)> |
205 | |
206 | This will apply the type-coercion if applicable. |
207 | |
76d37e5a |
208 | =item B<check ($value)> |
209 | |
210 | This method will return a true (C<1>) if the C<$value> passes the |
211 | constraint, and false (C<0>) otherwise. |
212 | |
213 | =item B<validate ($value)> |
214 | |
215 | This method is similar to C<check>, but it deals with the error |
216 | message. If the C<$value> passes the constraint, C<undef> will be |
217 | returned. If the C<$value> does B<not> pass the constraint, then |
218 | the C<message> will be used to construct a custom error message. |
6ba6d68c |
219 | |
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220 | =item B<name> |
221 | |
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222 | =item B<parent> |
223 | |
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224 | =item B<constraint> |
225 | |
76d37e5a |
226 | =item B<has_message> |
227 | |
228 | =item B<message> |
229 | |
4e036ee4 |
230 | =item B<has_coercion> |
231 | |
a27aa600 |
232 | =item B<coercion> |
233 | |
c8cf9aaa |
234 | =item B<hand_optimized_type_constraint> |
235 | |
236 | =item B<has_hand_optimized_type_constraint> |
237 | |
4e036ee4 |
238 | =back |
239 | |
451c8248 |
240 | =over 4 |
241 | |
242 | =item B<union (@type_constraints)> |
243 | |
244 | =back |
245 | |
4e036ee4 |
246 | =head1 BUGS |
247 | |
248 | All complex software has bugs lurking in it, and this module is no |
249 | exception. If you find a bug please either email me, or add the bug |
250 | to cpan-RT. |
251 | |
252 | =head1 AUTHOR |
253 | |
254 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
255 | |
256 | =head1 COPYRIGHT AND LICENSE |
257 | |
b77fdbed |
258 | Copyright 2006, 2007 by Infinity Interactive, Inc. |
4e036ee4 |
259 | |
260 | L<http://www.iinteractive.com> |
261 | |
262 | This library is free software; you can redistribute it and/or modify |
263 | it under the same terms as Perl itself. |
264 | |
c8cf9aaa |
265 | =cut |