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1 | package Moose::Meta::TypeConstraint::Enum; |
2 | |
3 | use strict; |
4 | use warnings; |
5 | use metaclass; |
6 | |
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7 | use Moose::Util::TypeConstraints (); |
8 | |
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9 | use base 'Moose::Meta::TypeConstraint'; |
10 | |
11 | __PACKAGE__->meta->add_attribute('values' => ( |
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12 | accessor => 'values', |
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13 | )); |
14 | |
15 | sub new { |
16 | my ( $class, %args ) = @_; |
17 | |
18 | $args{parent} = Moose::Util::TypeConstraints::find_type_constraint('Str'); |
19 | |
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20 | if ( scalar @{ $args{values} } < 2 ) { |
21 | require Moose; |
22 | Moose->throw_error("You must have at least two values to enumerate through"); |
23 | } |
24 | |
25 | for (@{ $args{values} }) { |
26 | if (!defined($_)) { |
27 | require Moose; |
28 | Moose->throw_error("Enum values must be strings, not undef"); |
29 | } |
30 | elsif (ref($_)) { |
31 | require Moose; |
32 | Moose->throw_error("Enum values must be strings, not '$_'"); |
33 | } |
34 | } |
35 | |
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36 | my $self = $class->_new(\%args); |
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37 | |
38 | $self->compile_type_constraint() |
39 | unless $self->_has_compiled_type_constraint; |
40 | |
41 | return $self; |
42 | } |
43 | |
44 | sub equals { |
45 | my ( $self, $type_or_name ) = @_; |
46 | |
47 | my $other = Moose::Util::TypeConstraints::find_type_constraint($type_or_name); |
48 | |
49 | return unless $other->isa(__PACKAGE__); |
50 | |
51 | my @self_values = sort @{ $self->values }; |
52 | my @other_values = sort @{ $other->values }; |
53 | |
54 | return unless @self_values == @other_values; |
55 | |
56 | while ( @self_values ) { |
57 | my $value = shift @self_values; |
58 | my $other_value = shift @other_values; |
59 | |
60 | return unless $value eq $other_value; |
61 | } |
62 | |
63 | return 1; |
64 | } |
65 | |
66 | sub constraint { |
67 | my $self = shift; |
68 | |
69 | my %values = map { $_ => undef } @{ $self->values }; |
70 | |
71 | return sub { exists $values{$_[0]} }; |
72 | } |
73 | |
74 | sub _compile_hand_optimized_type_constraint { |
75 | my $self = shift; |
76 | |
77 | my %values = map { $_ => undef } @{ $self->values }; |
78 | |
79 | sub { defined($_[0]) && !ref($_[0]) && exists $values{$_[0]} }; |
80 | } |
81 | |
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82 | sub create_child_type { |
83 | my ($self, @args) = @_; |
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84 | return Moose::Meta::TypeConstraint->new(@args, parent => $self); |
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85 | } |
86 | |
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87 | 1; |
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88 | |
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89 | # ABSTRACT: Type constraint for enumerated values. |
90 | |
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91 | __END__ |
92 | |
93 | =pod |
94 | |
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95 | =head1 DESCRIPTION |
96 | |
97 | This class represents type constraints based on an enumerated list of |
98 | acceptable values. |
99 | |
100 | =head1 INHERITANCE |
101 | |
102 | C<Moose::Meta::TypeConstraint::Enum> is a subclass of |
103 | L<Moose::Meta::TypeConstraint>. |
104 | |
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105 | =head1 METHODS |
106 | |
107 | =over 4 |
108 | |
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109 | =item B<< Moose::Meta::TypeConstraint::Enum->new(%options) >> |
110 | |
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111 | This creates a new enum type constraint based on the given |
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112 | C<%options>. |
113 | |
114 | It takes the same options as its parent, with several |
115 | exceptions. First, it requires an additional option, C<values>. This |
116 | should be an array reference containing a list of valid string |
117 | values. Second, it automatically sets the parent to the C<Str> type. |
118 | |
119 | Finally, it ignores any provided C<constraint> option. The constraint |
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120 | is generated automatically based on the provided C<values>. |
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121 | |
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122 | =item B<< $constraint->values >> |
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123 | |
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124 | Returns the array reference of acceptable values provided to the |
125 | constructor. |
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126 | |
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127 | =item B<< $constraint->create_child_type >> |
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128 | |
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129 | This returns a new L<Moose::Meta::TypeConstraint> object with the type |
130 | as its parent. |
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131 | |
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132 | Note that it does I<not> return a C<Moose::Meta::TypeConstraint::Enum> |
133 | object! |
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134 | |
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135 | =back |
136 | |
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137 | =head1 BUGS |
138 | |
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139 | See L<Moose/BUGS> for details on reporting bugs. |
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140 | |
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141 | =cut |
142 | |
143 | |