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1 | package MooseX::Types::TypeDecorator; |
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2 | our $VERSION = "0.25"; |
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3 | |
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4 | use strict; |
5 | use warnings; |
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6 | |
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7 | |
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8 | use Carp::Clan qw( ^MooseX::Types ); |
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9 | use Moose::Util::TypeConstraints (); |
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10 | use Moose::Meta::TypeConstraint::Union; |
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11 | use Scalar::Util qw(blessed); |
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12 | |
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13 | use overload( |
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14 | '0+' => sub { |
15 | my $self = shift @_; |
16 | my $tc = $self->{__type_constraint}; |
17 | return 0+$tc; |
18 | }, |
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19 | '""' => sub { |
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20 | my $self = shift @_; |
21 | if(blessed $self) { |
22 | return $self->__type_constraint->name; |
23 | } else { |
24 | return "$self"; |
25 | } |
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26 | }, |
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27 | bool => sub { 1 }, |
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28 | '|' => sub { |
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29 | |
30 | ## It's kind of ugly that we need to know about Union Types, but this |
31 | ## is needed for syntax compatibility. Maybe someday we'll all just do |
32 | ## Or[Str,Str,Int] |
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33 | |
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34 | my @args = @_[0,1]; ## arg 3 is special, see the overload docs. |
35 | my @tc = grep {blessed $_} map { |
36 | blessed $_ ? $_ : |
37 | Moose::Util::TypeConstraints::find_or_parse_type_constraint($_) |
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38 | || __PACKAGE__->_throw_error( "$_ is not a type constraint") |
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39 | } @args; |
40 | |
41 | ( scalar @tc == scalar @args) |
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42 | || __PACKAGE__->_throw_error( |
43 | "one of your type constraints is bad. Passed: ". join(', ', @args) ." Got: ". join(', ', @tc)); |
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44 | |
45 | ( scalar @tc >= 2 ) |
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46 | || __PACKAGE__->_throw_error("You must pass in at least 2 type names to make a union"); |
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47 | |
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48 | my $union = Moose::Meta::TypeConstraint::Union->new(type_constraints=>\@tc); |
49 | return Moose::Util::TypeConstraints::register_type_constraint($union); |
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50 | }, |
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51 | fallback => 1, |
52 | |
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53 | ); |
54 | |
55 | =head1 NAME |
56 | |
57 | MooseX::Types::TypeDecorator - More flexible access to a Type Constraint |
58 | |
59 | =head1 DESCRIPTION |
60 | |
61 | This is a decorator object that contains an underlying type constraint. We use |
62 | this to control access to the type constraint and to add some features. |
63 | |
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64 | =head1 METHODS |
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65 | |
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66 | This class defines the following methods. |
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67 | |
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68 | =head2 new |
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69 | |
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70 | Old school instantiation |
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71 | |
72 | =cut |
73 | |
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74 | sub new { |
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75 | my $class = shift @_; |
76 | if(my $arg = shift @_) { |
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77 | if(blessed $arg && $arg->isa('Moose::Meta::TypeConstraint')) { |
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78 | return bless {'__type_constraint'=>$arg}, $class; |
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79 | } elsif( |
80 | blessed $arg && |
81 | $arg->isa('MooseX::Types::UndefinedType') |
82 | ) { |
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83 | ## stub in case we'll need to handle these types differently |
84 | return bless {'__type_constraint'=>$arg}, $class; |
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85 | } elsif(blessed $arg) { |
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86 | __PACKAGE__->_throw_error("Argument must be ->isa('Moose::Meta::TypeConstraint') or ->isa('MooseX::Types::UndefinedType'), not ". blessed $arg); |
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87 | } else { |
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88 | __PACKAGE__->_throw_error("Argument cannot be '$arg'"); |
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89 | } |
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90 | } else { |
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91 | __PACKAGE__->_throw_error("This method [new] requires a single argument."); |
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92 | } |
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93 | } |
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94 | |
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95 | =head2 __type_constraint ($type_constraint) |
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96 | |
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97 | Set/Get the type_constraint. |
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98 | |
99 | =cut |
100 | |
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101 | sub __type_constraint { |
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102 | my $self = shift @_; |
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103 | if(blessed $self) { |
104 | if(defined(my $tc = shift @_)) { |
105 | $self->{__type_constraint} = $tc; |
106 | } |
107 | return $self->{__type_constraint}; |
108 | } else { |
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109 | __PACKAGE__->_throw_error('cannot call __type_constraint as a class method'); |
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110 | } |
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111 | } |
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112 | |
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113 | =head2 isa |
114 | |
115 | handle $self->isa since AUTOLOAD can't. |
116 | |
117 | =cut |
118 | |
119 | sub isa { |
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120 | my ($self, $target) = @_; |
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121 | if(defined $target) { |
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122 | if(blessed $self) { |
123 | return $self->__type_constraint->isa($target); |
124 | } else { |
125 | return; |
126 | } |
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127 | } else { |
128 | return; |
129 | } |
130 | } |
131 | |
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132 | |
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133 | =head2 can |
134 | |
135 | handle $self->can since AUTOLOAD can't. |
136 | |
137 | =cut |
138 | |
139 | sub can { |
140 | my ($self, $target) = @_; |
141 | if(defined $target) { |
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142 | if(blessed $self) { |
143 | return $self->__type_constraint->can($target); |
144 | } else { |
145 | return; |
146 | } |
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147 | } else { |
148 | return; |
149 | } |
150 | } |
151 | |
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152 | =head2 meta |
153 | |
154 | have meta examine the underlying type constraints |
155 | |
156 | =cut |
157 | |
158 | sub meta { |
159 | my $self = shift @_; |
160 | if(blessed $self) { |
161 | return $self->__type_constraint->meta; |
162 | } |
163 | } |
164 | |
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165 | =head2 _throw_error |
166 | |
167 | properly delegate error messages |
168 | |
169 | =cut |
170 | |
171 | sub _throw_error { |
172 | shift; |
173 | require Moose; |
174 | unshift @_, 'Moose'; |
175 | goto &Moose::throw_error; |
176 | } |
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177 | |
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178 | =head2 DESTROY |
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179 | |
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180 | We might need it later |
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181 | |
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182 | =cut |
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183 | |
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184 | sub DESTROY { |
185 | return; |
186 | } |
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187 | |
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188 | =head2 AUTOLOAD |
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189 | |
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190 | Delegate to the decorator targe |
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191 | |
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192 | =cut |
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193 | |
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194 | sub AUTOLOAD { |
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195 | |
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196 | my ($self, @args) = @_; |
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197 | my ($method) = (our $AUTOLOAD =~ /([^:]+)$/); |
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198 | |
199 | ## We delegate with this method in an attempt to support a value of |
200 | ## __type_constraint which is also AUTOLOADing, in particular the class |
201 | ## MooseX::Types::UndefinedType which AUTOLOADs during autovivication. |
202 | |
203 | my $return; |
204 | |
205 | eval { |
206 | $return = $self->__type_constraint->$method(@args); |
207 | }; if($@) { |
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208 | __PACKAGE__->_throw_error($@); |
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209 | } else { |
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210 | return $return; |
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211 | } |
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212 | } |
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213 | |
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214 | =head1 AUTHOR |
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215 | |
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216 | See L<MooseX::Types/AUTHOR>. |
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217 | |
218 | =head1 LICENSE |
219 | |
220 | This program is free software; you can redistribute it and/or modify |
221 | it under the same terms as perl itself. |
222 | |
223 | =cut |
224 | |
225 | 1; |