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1 | package Mouse::Meta::TypeConstraint; |
2 | use strict; |
3 | use warnings; |
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4 | |
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5 | use overload |
6 | '""' => sub { shift->{name} }, # stringify to tc name |
7 | fallback => 1; |
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8 | |
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9 | use Carp qw(confess); |
10 | use Scalar::Util qw(blessed reftype); |
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11 | |
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12 | use Mouse::Util qw(:meta); |
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13 | |
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14 | my $null_check = sub { 1 }; |
15 | |
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16 | sub new { |
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17 | my($class, %args) = @_; |
18 | |
19 | $args{name} = '__ANON__' if !defined $args{name}; |
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20 | |
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21 | my $check = delete $args{optimized}; |
22 | |
23 | if($args{_compiled_type_constraint}){ |
24 | Carp::cluck("'_compiled_type_constraint' has been deprecated, use 'optimized' instead"); |
25 | $check = $args{_compiled_type_constraint}; |
26 | |
27 | if(blessed($check)){ |
28 | Carp::cluck("Constraint must be a CODE reference"); |
29 | $check = $check->{compiled_type_constraint}; |
30 | } |
31 | } |
32 | |
33 | if($check){ |
34 | $args{hand_optimized_type_constraint} = $check; |
35 | $args{compiled_type_constraint} = $check; |
36 | } |
37 | |
38 | $check = $args{constraint}; |
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39 | |
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40 | if(blessed($check)){ |
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41 | Carp::cluck("Constraint for $args{name} must be a CODE reference"); |
42 | $check = $check->{compiled_type_constraint}; |
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43 | } |
44 | |
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45 | if(defined($check) && ref($check) ne 'CODE'){ |
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46 | confess("Constraint for $args{name} is not a CODE reference"); |
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47 | } |
48 | |
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49 | $args{package_defined_in} ||= caller; |
50 | |
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51 | my $self = bless \%args, $class; |
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52 | $self->compile_type_constraint() if !$self->{hand_optimized_type_constraint}; |
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53 | |
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54 | if($self->{type_constraints}){ # Union |
55 | my @coercions; |
56 | foreach my $type(@{$self->{type_constraints}}){ |
57 | if($type->has_coercion){ |
58 | push @coercions, $type; |
59 | } |
60 | } |
61 | if(@coercions){ |
62 | $self->{_compiled_type_coercion} = sub { |
63 | my($thing) = @_; |
64 | foreach my $type(@coercions){ |
65 | my $value = $type->coerce($thing); |
66 | return $value if $self->check($value); |
67 | } |
68 | return $thing; |
69 | }; |
70 | } |
71 | } |
72 | |
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73 | return $self; |
74 | } |
75 | |
76 | sub create_child_type{ |
77 | my $self = shift; |
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78 | # XXX: FIXME |
79 | return ref($self)->new( |
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80 | # a child inherits its parent's attributes |
81 | %{$self}, |
82 | |
83 | # but does not inherit 'compiled_type_constraint' and 'hand_optimized_type_constraint' |
84 | compiled_type_constraint => undef, |
85 | hand_optimized_type_constraint => undef, |
86 | |
87 | # and is given child-specific args, of course. |
88 | @_, |
89 | |
90 | # and its parent |
91 | parent => $self, |
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92 | ); |
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93 | } |
94 | |
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95 | sub name { $_[0]->{name} } |
96 | sub parent { $_[0]->{parent} } |
97 | sub message { $_[0]->{message} } |
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98 | |
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99 | sub _compiled_type_constraint{ $_[0]->{compiled_type_constraint} } |
100 | |
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101 | sub has_coercion{ exists $_[0]->{_compiled_type_coercion} } |
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102 | |
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103 | sub compile_type_constraint{ |
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104 | my($self) = @_; |
105 | |
106 | # add parents first |
107 | my @checks; |
108 | for(my $parent = $self->parent; defined $parent; $parent = $parent->parent){ |
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109 | if($parent->{hand_optimized_type_constraint}){ |
110 | push @checks, $parent->{hand_optimized_type_constraint}; |
111 | last; # a hand optimized constraint must include all the parents |
112 | } |
113 | elsif($parent->{constraint}){ |
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114 | push @checks, $parent->{constraint}; |
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115 | } |
116 | } |
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117 | |
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118 | # then add child |
119 | if($self->{constraint}){ |
120 | push @checks, $self->{constraint}; |
121 | } |
122 | |
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123 | if($self->{type_constraints}){ # Union |
124 | my @types = map{ $_->_compiled_type_constraint } @{ $self->{type_constraints} }; |
125 | push @checks, sub{ |
126 | foreach my $c(@types){ |
127 | return 1 if $c->($_[0]); |
128 | } |
129 | return 0; |
130 | }; |
131 | } |
132 | |
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133 | if(@checks == 0){ |
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134 | $self->{compiled_type_constraint} = $null_check; |
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135 | } |
136 | elsif(@checks == 1){ |
137 | my $c = $checks[0]; |
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138 | $self->{compiled_type_constraint} = sub{ |
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139 | my(@args) = @_; |
140 | local $_ = $args[0]; |
141 | return $c->(@args); |
142 | }; |
143 | } |
144 | else{ |
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145 | $self->{compiled_type_constraint} = sub{ |
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146 | my(@args) = @_; |
147 | local $_ = $args[0]; |
148 | foreach my $c(@checks){ |
149 | return undef if !$c->(@args); |
150 | } |
151 | return 1; |
152 | }; |
153 | } |
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154 | return; |
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155 | } |
156 | |
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157 | sub _add_type_coercions{ |
158 | my $self = shift; |
159 | |
160 | my $coercions = ($self->{_coercion_map} ||= []); |
161 | my %has = map{ $_->[0] => undef } @{$coercions}; |
162 | |
163 | for(my $i = 0; $i < @_; $i++){ |
164 | my $from = $_[ $i]; |
165 | my $action = $_[++$i]; |
166 | |
167 | if(exists $has{$from}){ |
168 | confess("A coercion action already exists for '$from'"); |
169 | } |
170 | |
171 | my $type = Mouse::Util::TypeConstraints::find_or_parse_type_constraint($from) |
172 | or confess("Could not find the type constraint ($from) to coerce from"); |
173 | |
174 | push @{$coercions}, [ $type => $action ]; |
175 | } |
176 | |
177 | # compile |
178 | if(exists $self->{type_constraints}){ # union type |
179 | confess("Cannot add additional type coercions to Union types"); |
180 | } |
181 | else{ |
182 | $self->{_compiled_type_coercion} = sub { |
183 | my($thing) = @_;\r |
184 | foreach my $pair (@{$coercions}) {\r |
185 | #my ($constraint, $converter) = @$pair;\r |
186 | if ($pair->[0]->check($thing)) {\r |
187 | local $_ = $thing; |
188 | return $pair->[1]->($thing); |
189 | }\r |
190 | }\r |
191 | return $thing;\r |
192 | }; |
193 | } |
194 | return; |
195 | } |
196 | |
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197 | sub check { |
198 | my $self = shift; |
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199 | return $self->_compiled_type_constraint->(@_); |
200 | } |
201 | |
202 | sub coerce { |
203 | my $self = shift; |
204 | if(!$self->{_compiled_type_coercion}){ |
205 | confess("Cannot coerce without a type coercion ($self)"); |
206 | } |
207 | |
208 | return $_[0] if $self->_compiled_type_constraint->(@_); |
209 | |
210 | return $self->{_compiled_type_coercion}->(@_); |
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211 | } |
212 | |
213 | sub get_message { |
214 | my ($self, $value) = @_; |
215 | if ( my $msg = $self->message ) { |
216 | local $_ = $value; |
217 | return $msg->($value); |
218 | } |
219 | else { |
220 | $value = ( defined $value ? overload::StrVal($value) : 'undef' ); |
221 | return "Validation failed for '$self' failed with value $value"; |
222 | } |
223 | } |
224 | |
225 | sub is_a_type_of{ |
226 | my($self, $other) = @_; |
227 | |
228 | # ->is_a_type_of('__ANON__') is always false |
229 | return 0 if !blessed($other) && $other eq '__ANON__'; |
230 | |
231 | (my $other_name = $other) =~ s/\s+//g; |
232 | |
233 | return 1 if $self->name eq $other_name; |
234 | |
235 | if(exists $self->{type_constraints}){ # union |
236 | foreach my $type(@{$self->{type_constraints}}){ |
237 | return 1 if $type->name eq $other_name; |
238 | } |
239 | } |
240 | |
241 | for(my $parent = $self->parent; defined $parent; $parent = $parent->parent){ |
242 | return 1 if $parent->name eq $other_name; |
243 | } |
244 | |
245 | return 0; |
246 | } |
247 | |
248 | |
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249 | 1; |
250 | __END__ |
251 | |
252 | =head1 NAME |
253 | |
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254 | Mouse::Meta::TypeConstraint - The Mouse Type Constraint metaclass |
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255 | |
256 | =head1 DESCRIPTION |
257 | |
258 | For the most part, the only time you will ever encounter an |
259 | instance of this class is if you are doing some serious deep |
260 | introspection. This API should not be considered final, but |
261 | it is B<highly unlikely> that this will matter to a regular |
262 | Mouse user. |
263 | |
264 | Don't use this. |
265 | |
266 | =head1 METHODS |
267 | |
268 | =over 4 |
269 | |
270 | =item B<new> |
271 | |
272 | =item B<name> |
273 | |
274 | =back |
275 | |
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276 | =head1 SEE ALSO |
277 | |
278 | L<Moose::Meta::TypeConstraint> |
279 | |
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280 | =cut |
281 | |