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1 | package MooseX::Types::TypeDecorator; |
2 | |
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3 | use strict; |
4 | use warnings; |
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5 | |
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6 | |
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7 | use Carp::Clan qw( ^MooseX::Types ); |
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8 | use Moose::Util::TypeConstraints (); |
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9 | use Moose::Meta::TypeConstraint::Union; |
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10 | use Scalar::Util qw(blessed); |
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11 | |
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12 | use overload( |
13 | '""' => sub { |
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14 | my $self = shift @_; |
15 | if(blessed $self) { |
16 | return $self->__type_constraint->name; |
17 | } else { |
18 | return "$self"; |
19 | } |
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20 | }, |
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21 | '|' => sub { |
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22 | |
23 | ## It's kind of ugly that we need to know about Union Types, but this |
24 | ## is needed for syntax compatibility. Maybe someday we'll all just do |
25 | ## Or[Str,Str,Int] |
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26 | |
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27 | my @args = @_[0,1]; ## arg 3 is special, see the overload docs. |
28 | my @tc = grep {blessed $_} map { |
29 | blessed $_ ? $_ : |
30 | Moose::Util::TypeConstraints::find_or_parse_type_constraint($_) |
31 | || croak "$_ is not a type constraint" |
32 | } @args; |
33 | |
34 | ( scalar @tc == scalar @args) |
35 | || croak "one of your type constraints is bad. Passed: ". join(', ', @args) ." Got: ". join(', ', @tc); |
36 | |
37 | ( scalar @tc >= 2 ) |
38 | || croak "You must pass in at least 2 type names to make a union"; |
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39 | |
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40 | my $union = Moose::Meta::TypeConstraint::Union->new(type_constraints=>\@tc); |
41 | return Moose::Util::TypeConstraints::register_type_constraint($union); |
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42 | }, |
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43 | fallback => 1, |
44 | |
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45 | ); |
46 | |
47 | =head1 NAME |
48 | |
49 | MooseX::Types::TypeDecorator - More flexible access to a Type Constraint |
50 | |
51 | =head1 DESCRIPTION |
52 | |
53 | This is a decorator object that contains an underlying type constraint. We use |
54 | this to control access to the type constraint and to add some features. |
55 | |
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56 | =head1 METHODS |
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57 | |
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58 | This class defines the following methods. |
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59 | |
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60 | =head2 new |
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61 | |
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62 | Old school instantiation |
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63 | |
64 | =cut |
65 | |
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66 | sub new { |
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67 | my $class = shift @_; |
68 | if(my $arg = shift @_) { |
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69 | if(blessed $arg && $arg->isa('Moose::Meta::TypeConstraint')) { |
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70 | return bless {'__type_constraint'=>$arg}, $class; |
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71 | } elsif( |
72 | blessed $arg && |
73 | $arg->isa('MooseX::Types::UndefinedType') |
74 | ) { |
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75 | ## stub in case we'll need to handle these types differently |
76 | return bless {'__type_constraint'=>$arg}, $class; |
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77 | } elsif(blessed $arg) { |
78 | croak "Argument must be ->isa('Moose::Meta::TypeConstraint') or ->isa('MooseX::Types::UndefinedType'), not ". blessed $arg; |
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79 | } else { |
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80 | croak "Argument cannot be '$arg'"; |
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81 | } |
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82 | } else { |
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83 | croak "This method [new] requires a single argument."; |
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84 | } |
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85 | } |
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86 | |
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87 | =head2 __type_constraint ($type_constraint) |
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88 | |
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89 | Set/Get the type_constraint. |
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90 | |
91 | =cut |
92 | |
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93 | sub __type_constraint { |
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94 | my $self = shift @_; |
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95 | if(blessed $self) { |
96 | if(defined(my $tc = shift @_)) { |
97 | $self->{__type_constraint} = $tc; |
98 | } |
99 | return $self->{__type_constraint}; |
100 | } else { |
101 | croak 'cannot call __type_constraint as a class method'; |
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102 | } |
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103 | } |
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104 | |
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105 | =head2 isa |
106 | |
107 | handle $self->isa since AUTOLOAD can't. |
108 | |
109 | =cut |
110 | |
111 | sub isa { |
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112 | my ($self, $target) = @_; |
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113 | if(defined $target) { |
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114 | if(blessed $self) { |
115 | return $self->__type_constraint->isa($target); |
116 | } else { |
117 | return; |
118 | } |
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119 | } else { |
120 | return; |
121 | } |
122 | } |
123 | |
124 | =head2 can |
125 | |
126 | handle $self->can since AUTOLOAD can't. |
127 | |
128 | =cut |
129 | |
130 | sub can { |
131 | my ($self, $target) = @_; |
132 | if(defined $target) { |
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133 | if(blessed $self) { |
134 | return $self->__type_constraint->can($target); |
135 | } else { |
136 | return; |
137 | } |
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138 | } else { |
139 | return; |
140 | } |
141 | } |
142 | |
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143 | =head2 meta |
144 | |
145 | have meta examine the underlying type constraints |
146 | |
147 | =cut |
148 | |
149 | sub meta { |
150 | my $self = shift @_; |
151 | if(blessed $self) { |
152 | return $self->__type_constraint->meta; |
153 | } |
154 | } |
155 | |
156 | |
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157 | =head2 DESTROY |
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158 | |
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159 | We might need it later |
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160 | |
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161 | =cut |
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162 | |
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163 | sub DESTROY { |
164 | return; |
165 | } |
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166 | |
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167 | =head2 AUTOLOAD |
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168 | |
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169 | Delegate to the decorator targe |
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170 | |
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171 | =cut |
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172 | |
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173 | sub AUTOLOAD { |
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174 | |
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175 | my ($self, @args) = @_; |
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176 | my ($method) = (our $AUTOLOAD =~ /([^:]+)$/); |
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177 | |
178 | ## We delegate with this method in an attempt to support a value of |
179 | ## __type_constraint which is also AUTOLOADing, in particular the class |
180 | ## MooseX::Types::UndefinedType which AUTOLOADs during autovivication. |
181 | |
182 | my $return; |
183 | |
184 | eval { |
185 | $return = $self->__type_constraint->$method(@args); |
186 | }; if($@) { |
187 | croak $@; |
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188 | } else { |
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189 | return $return; |
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190 | } |
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191 | } |
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192 | |
193 | =head1 AUTHOR AND COPYRIGHT |
194 | |
195 | John Napiorkowski (jnapiorkowski) <jjnapiork@cpan.org> |
196 | |
197 | =head1 LICENSE |
198 | |
199 | This program is free software; you can redistribute it and/or modify |
200 | it under the same terms as perl itself. |
201 | |
202 | =cut |
203 | |
204 | 1; |