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684db121 |
1 | package Mouse::Meta::TypeConstraint; |
bc69ee88 |
2 | use Mouse::Util qw(:meta); # enables strict and warnings |
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3 | |
f5ee065f |
4 | use overload |
c489a477 |
5 | 'bool' => sub { 1 }, # always true |
6 | |
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7 | '""' => sub { $_[0]->name }, # stringify to tc name |
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8 | |
9 | '|' => sub { # or-combination |
10 | require Mouse::Util::TypeConstraints; |
11 | return Mouse::Util::TypeConstraints::find_or_parse_type_constraint( |
12 | "$_[0] | $_[1]", |
13 | ); |
14 | }, |
15 | |
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16 | fallback => 1; |
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17 | |
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18 | use Carp (); |
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19 | |
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20 | sub new { |
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21 | my($class, %args) = @_; |
22 | |
23 | $args{name} = '__ANON__' if !defined $args{name}; |
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24 | |
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25 | my $check = delete $args{optimized}; |
26 | |
3b89ea91 |
27 | if($check){ |
28 | $args{hand_optimized_type_constraint} = $check; |
29 | $args{compiled_type_constraint} = $check; |
30 | } |
31 | |
32 | $check = $args{constraint}; |
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33 | |
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34 | if(defined($check) && ref($check) ne 'CODE'){ |
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35 | Carp::confess("Constraint for $args{name} is not a CODE reference"); |
f5ee065f |
36 | } |
37 | |
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38 | $args{package_defined_in} ||= caller; |
39 | |
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40 | my $self = bless \%args, $class; |
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41 | $self->compile_type_constraint() if !$self->{hand_optimized_type_constraint}; |
f5ee065f |
42 | |
536e3c33 |
43 | $self->_compile_union_type_coercion() if $self->{type_constraints}; |
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44 | return $self; |
45 | } |
46 | |
47 | sub create_child_type{ |
48 | my $self = shift; |
e98220ab |
49 | # XXX: FIXME |
50 | return ref($self)->new( |
3b89ea91 |
51 | # a child inherits its parent's attributes |
52 | %{$self}, |
53 | |
54 | # but does not inherit 'compiled_type_constraint' and 'hand_optimized_type_constraint' |
55 | compiled_type_constraint => undef, |
56 | hand_optimized_type_constraint => undef, |
57 | |
58 | # and is given child-specific args, of course. |
59 | @_, |
60 | |
61 | # and its parent |
62 | parent => $self, |
e98220ab |
63 | ); |
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64 | } |
65 | |
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66 | sub name; |
67 | sub parent; |
68 | sub message; |
69 | sub has_coercion; |
70 | sub _compiled_type_constraint; |
71 | sub _compiled_type_coercion; |
72 | |
73 | sub compile_type_constraint; |
74 | |
ffbbf459 |
75 | sub _add_type_coercions{ |
76 | my $self = shift; |
77 | |
78 | my $coercions = ($self->{_coercion_map} ||= []); |
79 | my %has = map{ $_->[0] => undef } @{$coercions}; |
80 | |
81 | for(my $i = 0; $i < @_; $i++){ |
82 | my $from = $_[ $i]; |
83 | my $action = $_[++$i]; |
84 | |
85 | if(exists $has{$from}){ |
ca352580 |
86 | Carp::confess("A coercion action already exists for '$from'"); |
ffbbf459 |
87 | } |
88 | |
89 | my $type = Mouse::Util::TypeConstraints::find_or_parse_type_constraint($from) |
ca352580 |
90 | or Carp::confess("Could not find the type constraint ($from) to coerce from"); |
ffbbf459 |
91 | |
92 | push @{$coercions}, [ $type => $action ]; |
93 | } |
94 | |
95 | # compile |
96 | if(exists $self->{type_constraints}){ # union type |
ca352580 |
97 | Carp::confess("Cannot add additional type coercions to Union types"); |
ffbbf459 |
98 | } |
99 | else{ |
536e3c33 |
100 | $self->_compile_type_coercion(); |
101 | } |
102 | return; |
103 | } |
104 | |
105 | sub _compile_type_coercion { |
106 | my($self) = @_; |
107 | |
108 | my @coercions = @{$self->{_coercion_map}}; |
109 | |
110 | $self->{_compiled_type_coercion} = sub { |
111 | my($thing) = @_; |
112 | foreach my $pair (@coercions) { |
113 | #my ($constraint, $converter) = @$pair; |
114 | if ($pair->[0]->check($thing)) { |
115 | local $_ = $thing; |
116 | return $pair->[1]->($thing); |
117 | } |
118 | } |
119 | return $thing; |
120 | }; |
121 | return; |
122 | } |
123 | |
124 | sub _compile_union_type_coercion { |
125 | my($self) = @_; |
126 | |
127 | my @coercions; |
128 | foreach my $type(@{$self->{type_constraints}}){ |
129 | if($type->has_coercion){ |
130 | push @coercions, $type; |
131 | } |
132 | } |
133 | if(@coercions){ |
ffbbf459 |
134 | $self->{_compiled_type_coercion} = sub { |
536e3c33 |
135 | my($thing) = @_; |
136 | foreach my $type(@coercions){ |
137 | my $value = $type->coerce($thing); |
138 | return $value if $self->check($value); |
139 | } |
140 | return $thing; |
ffbbf459 |
141 | }; |
142 | } |
143 | return; |
144 | } |
145 | |
feb0e21b |
146 | sub check { |
147 | my $self = shift; |
ffbbf459 |
148 | return $self->_compiled_type_constraint->(@_); |
149 | } |
150 | |
151 | sub coerce { |
152 | my $self = shift; |
ffbbf459 |
153 | |
de0d4152 |
154 | my $coercion = $self->_compiled_type_coercion; |
155 | if(!$coercion){ |
156 | Carp::confess("Cannot coerce without a type coercion"); |
157 | } |
158 | |
ffbbf459 |
159 | return $_[0] if $self->_compiled_type_constraint->(@_); |
160 | |
de0d4152 |
161 | return $coercion->(@_); |
feb0e21b |
162 | } |
163 | |
164 | sub get_message { |
165 | my ($self, $value) = @_; |
166 | if ( my $msg = $self->message ) { |
167 | local $_ = $value; |
168 | return $msg->($value); |
169 | } |
170 | else { |
171 | $value = ( defined $value ? overload::StrVal($value) : 'undef' ); |
172 | return "Validation failed for '$self' failed with value $value"; |
173 | } |
174 | } |
175 | |
176 | sub is_a_type_of{ |
177 | my($self, $other) = @_; |
178 | |
179 | # ->is_a_type_of('__ANON__') is always false |
ca352580 |
180 | return 0 if !ref($other) && $other eq '__ANON__'; |
feb0e21b |
181 | |
182 | (my $other_name = $other) =~ s/\s+//g; |
183 | |
184 | return 1 if $self->name eq $other_name; |
185 | |
186 | if(exists $self->{type_constraints}){ # union |
187 | foreach my $type(@{$self->{type_constraints}}){ |
188 | return 1 if $type->name eq $other_name; |
189 | } |
190 | } |
191 | |
192 | for(my $parent = $self->parent; defined $parent; $parent = $parent->parent){ |
193 | return 1 if $parent->name eq $other_name; |
194 | } |
195 | |
196 | return 0; |
197 | } |
198 | |
b4d791ba |
199 | # See also Moose::Meta::TypeConstraint::Parameterizable |
200 | sub parameterize{ |
201 | my($self, $param, $name) = @_; |
202 | |
203 | if(!ref $param){ |
204 | require Mouse::Util::TypeConstraints; |
205 | $param = Mouse::Util::TypeConstraints::find_or_create_isa_type_constraint($param); |
206 | } |
207 | |
208 | $name ||= sprintf '%s[%s]', $self->name, $param->name; |
209 | |
210 | my $generator = $self->{constraint_generator} |
211 | || Carp::confess("The $name constraint cannot be used, because $param doesn't subtype from a parameterizable type"); |
212 | |
213 | return Mouse::Meta::TypeConstraint->new( |
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214 | name => $name, |
215 | parent => $self, |
216 | parameter => $param, |
217 | constraint => $generator->($param), # must be 'constraint', not 'optimized' |
b4d791ba |
218 | |
5a363f78 |
219 | type => 'Parameterized', |
b4d791ba |
220 | ); |
221 | } |
feb0e21b |
222 | |
684db121 |
223 | 1; |
224 | __END__ |
225 | |
226 | =head1 NAME |
227 | |
1820fffe |
228 | Mouse::Meta::TypeConstraint - The Mouse Type Constraint metaclass |
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229 | |
a25ca8d6 |
230 | =head1 VERSION |
231 | |
e9148d13 |
232 | This document describes Mouse version 0.50 |
a25ca8d6 |
233 | |
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234 | =head1 DESCRIPTION |
235 | |
236 | For the most part, the only time you will ever encounter an |
237 | instance of this class is if you are doing some serious deep |
238 | introspection. This API should not be considered final, but |
239 | it is B<highly unlikely> that this will matter to a regular |
240 | Mouse user. |
241 | |
242 | Don't use this. |
243 | |
244 | =head1 METHODS |
245 | |
246 | =over 4 |
247 | |
248 | =item B<new> |
249 | |
250 | =item B<name> |
251 | |
252 | =back |
253 | |
1820fffe |
254 | =head1 SEE ALSO |
255 | |
256 | L<Moose::Meta::TypeConstraint> |
257 | |
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258 | =cut |
259 | |