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1 | package MooseX::Types::TypeDecorator; |
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2 | |
3 | #ABSTRACT: Wraps Moose::Meta::TypeConstraint objects with added features |
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4 | |
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5 | use strict; |
6 | use warnings; |
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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 | |
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55 | =head1 DESCRIPTION |
56 | |
57 | This is a decorator object that contains an underlying type constraint. We use |
58 | this to control access to the type constraint and to add some features. |
59 | |
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60 | =head1 METHODS |
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61 | |
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62 | This class defines the following methods. |
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63 | |
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64 | =head2 new |
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65 | |
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66 | Old school instantiation |
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67 | |
68 | =cut |
69 | |
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70 | sub new { |
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71 | my $class = shift @_; |
72 | if(my $arg = shift @_) { |
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73 | if(blessed $arg && $arg->isa('Moose::Meta::TypeConstraint')) { |
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74 | return bless {'__type_constraint'=>$arg}, $class; |
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75 | } elsif( |
76 | blessed $arg && |
77 | $arg->isa('MooseX::Types::UndefinedType') |
78 | ) { |
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79 | ## stub in case we'll need to handle these types differently |
80 | return bless {'__type_constraint'=>$arg}, $class; |
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81 | } elsif(blessed $arg) { |
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82 | __PACKAGE__->_throw_error("Argument must be ->isa('Moose::Meta::TypeConstraint') or ->isa('MooseX::Types::UndefinedType'), not ". blessed $arg); |
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83 | } else { |
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84 | __PACKAGE__->_throw_error("Argument cannot be '$arg'"); |
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85 | } |
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86 | } else { |
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87 | __PACKAGE__->_throw_error("This method [new] requires a single argument."); |
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88 | } |
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89 | } |
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90 | |
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91 | =head2 __type_constraint ($type_constraint) |
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92 | |
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93 | Set/Get the type_constraint. |
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94 | |
95 | =cut |
96 | |
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97 | sub __type_constraint { |
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98 | my $self = shift @_; |
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99 | if(blessed $self) { |
100 | if(defined(my $tc = shift @_)) { |
101 | $self->{__type_constraint} = $tc; |
102 | } |
103 | return $self->{__type_constraint}; |
104 | } else { |
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105 | __PACKAGE__->_throw_error('cannot call __type_constraint as a class method'); |
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106 | } |
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107 | } |
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108 | |
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109 | =head2 isa |
110 | |
111 | handle $self->isa since AUTOLOAD can't. |
112 | |
113 | =cut |
114 | |
115 | sub isa { |
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116 | my ($self, $target) = @_; |
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117 | if(defined $target) { |
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118 | if(blessed $self) { |
119 | return $self->__type_constraint->isa($target); |
120 | } else { |
121 | return; |
122 | } |
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123 | } else { |
124 | return; |
125 | } |
126 | } |
127 | |
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128 | |
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129 | =head2 can |
130 | |
131 | handle $self->can since AUTOLOAD can't. |
132 | |
133 | =cut |
134 | |
135 | sub can { |
136 | my ($self, $target) = @_; |
137 | if(defined $target) { |
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138 | if(blessed $self) { |
139 | return $self->__type_constraint->can($target); |
140 | } else { |
141 | return; |
142 | } |
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143 | } else { |
144 | return; |
145 | } |
146 | } |
147 | |
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148 | =head2 meta |
149 | |
150 | have meta examine the underlying type constraints |
151 | |
152 | =cut |
153 | |
154 | sub meta { |
155 | my $self = shift @_; |
156 | if(blessed $self) { |
157 | return $self->__type_constraint->meta; |
158 | } |
159 | } |
160 | |
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161 | =head2 _throw_error |
162 | |
163 | properly delegate error messages |
164 | |
165 | =cut |
166 | |
167 | sub _throw_error { |
168 | shift; |
169 | require Moose; |
170 | unshift @_, 'Moose'; |
171 | goto &Moose::throw_error; |
172 | } |
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173 | |
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174 | =head2 DESTROY |
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175 | |
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176 | We might need it later |
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177 | |
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178 | =cut |
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179 | |
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180 | sub DESTROY { |
181 | return; |
182 | } |
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183 | |
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184 | =head2 AUTOLOAD |
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185 | |
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186 | Delegate to the decorator target. |
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187 | |
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188 | =cut |
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189 | |
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190 | sub AUTOLOAD { |
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191 | |
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192 | my ($self, @args) = @_; |
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193 | my ($method) = (our $AUTOLOAD =~ /([^:]+)$/); |
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194 | |
195 | ## We delegate with this method in an attempt to support a value of |
196 | ## __type_constraint which is also AUTOLOADing, in particular the class |
197 | ## MooseX::Types::UndefinedType which AUTOLOADs during autovivication. |
198 | |
199 | my $return; |
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200 | eval { |
201 | $return = $self->__type_constraint->$method(@args); |
202 | }; if($@) { |
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203 | __PACKAGE__->_throw_error($@); |
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204 | } else { |
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205 | return $return; |
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206 | } |
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207 | } |
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208 | |
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209 | =head1 LICENSE |
210 | |
211 | This program is free software; you can redistribute it and/or modify |
212 | it under the same terms as perl itself. |
213 | |
214 | =cut |
215 | |
216 | 1; |