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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 $_ ? $_ : |
30 | Moose::Util::TypeConstraints::find_or_parse_type_constraint($_) |
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31 | || __PACKAGE__->_throw_error( "$_ is not a type constraint") |
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32 | } @args; |
33 | |
34 | ( scalar @tc == scalar @args) |
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35 | || __PACKAGE__->_throw_error( |
36 | "one of your type constraints is bad. Passed: ". join(', ', @args) ." Got: ". join(', ', @tc)); |
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37 | |
38 | ( scalar @tc >= 2 ) |
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39 | || __PACKAGE__->_throw_error("You must pass in at least 2 type names to make a union"); |
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40 | |
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41 | my $union = Moose::Meta::TypeConstraint::Union->new(type_constraints=>\@tc); |
42 | return Moose::Util::TypeConstraints::register_type_constraint($union); |
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43 | }, |
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44 | fallback => 1, |
45 | |
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46 | ); |
47 | |
48 | =head1 NAME |
49 | |
50 | MooseX::Types::TypeDecorator - More flexible access to a Type Constraint |
51 | |
52 | =head1 DESCRIPTION |
53 | |
54 | This is a decorator object that contains an underlying type constraint. We use |
55 | this to control access to the type constraint and to add some features. |
56 | |
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57 | =head1 METHODS |
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58 | |
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59 | This class defines the following methods. |
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60 | |
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61 | =head2 new |
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62 | |
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63 | Old school instantiation |
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64 | |
65 | =cut |
66 | |
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67 | sub new { |
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68 | my $class = shift @_; |
69 | if(my $arg = shift @_) { |
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70 | if(blessed $arg && $arg->isa('Moose::Meta::TypeConstraint')) { |
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71 | return bless {'__type_constraint'=>$arg}, $class; |
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72 | } elsif( |
73 | blessed $arg && |
74 | $arg->isa('MooseX::Types::UndefinedType') |
75 | ) { |
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76 | ## stub in case we'll need to handle these types differently |
77 | return bless {'__type_constraint'=>$arg}, $class; |
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78 | } elsif(blessed $arg) { |
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79 | __PACKAGE__->_throw_error("Argument must be ->isa('Moose::Meta::TypeConstraint') or ->isa('MooseX::Types::UndefinedType'), not ". blessed $arg); |
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80 | } else { |
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81 | __PACKAGE__->_throw_error("Argument cannot be '$arg'"); |
475bbd1d |
82 | } |
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83 | } else { |
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84 | __PACKAGE__->_throw_error("This method [new] requires a single argument."); |
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85 | } |
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86 | } |
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87 | |
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88 | =head2 __type_constraint ($type_constraint) |
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89 | |
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90 | Set/Get the type_constraint. |
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91 | |
92 | =cut |
93 | |
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94 | sub __type_constraint { |
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95 | my $self = shift @_; |
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96 | if(blessed $self) { |
97 | if(defined(my $tc = shift @_)) { |
98 | $self->{__type_constraint} = $tc; |
99 | } |
100 | return $self->{__type_constraint}; |
101 | } else { |
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102 | __PACKAGE__->_throw_error('cannot call __type_constraint as a class method'); |
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103 | } |
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104 | } |
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105 | |
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106 | =head2 isa |
107 | |
108 | handle $self->isa since AUTOLOAD can't. |
109 | |
110 | =cut |
111 | |
112 | sub isa { |
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113 | my ($self, $target) = @_; |
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114 | if(defined $target) { |
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115 | if(blessed $self) { |
116 | return $self->__type_constraint->isa($target); |
117 | } else { |
118 | return; |
119 | } |
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120 | } else { |
121 | return; |
122 | } |
123 | } |
124 | |
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125 | |
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126 | =head2 can |
127 | |
128 | handle $self->can since AUTOLOAD can't. |
129 | |
130 | =cut |
131 | |
132 | sub can { |
133 | my ($self, $target) = @_; |
134 | if(defined $target) { |
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135 | if(blessed $self) { |
136 | return $self->__type_constraint->can($target); |
137 | } else { |
138 | return; |
139 | } |
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140 | } else { |
141 | return; |
142 | } |
143 | } |
144 | |
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145 | =head2 meta |
146 | |
147 | have meta examine the underlying type constraints |
148 | |
149 | =cut |
150 | |
151 | sub meta { |
152 | my $self = shift @_; |
153 | if(blessed $self) { |
154 | return $self->__type_constraint->meta; |
155 | } |
156 | } |
157 | |
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158 | =head2 _throw_error |
159 | |
160 | properly delegate error messages |
161 | |
162 | =cut |
163 | |
164 | sub _throw_error { |
165 | shift; |
166 | require Moose; |
167 | unshift @_, 'Moose'; |
168 | goto &Moose::throw_error; |
169 | } |
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170 | |
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171 | =head2 DESTROY |
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172 | |
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173 | We might need it later |
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174 | |
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175 | =cut |
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176 | |
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177 | sub DESTROY { |
178 | return; |
179 | } |
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180 | |
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181 | =head2 AUTOLOAD |
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182 | |
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183 | Delegate to the decorator targe |
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184 | |
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185 | =cut |
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186 | |
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187 | sub AUTOLOAD { |
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188 | |
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189 | my ($self, @args) = @_; |
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190 | my ($method) = (our $AUTOLOAD =~ /([^:]+)$/); |
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191 | |
192 | ## We delegate with this method in an attempt to support a value of |
193 | ## __type_constraint which is also AUTOLOADing, in particular the class |
194 | ## MooseX::Types::UndefinedType which AUTOLOADs during autovivication. |
195 | |
196 | my $return; |
197 | |
198 | eval { |
199 | $return = $self->__type_constraint->$method(@args); |
200 | }; if($@) { |
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201 | __PACKAGE__->_throw_error($@); |
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202 | } else { |
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203 | return $return; |
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204 | } |
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205 | } |
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206 | |
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207 | =head1 AUTHOR |
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208 | |
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209 | See L<MooseX::Types/AUTHOR>. |
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210 | |
211 | =head1 LICENSE |
212 | |
213 | This program is free software; you can redistribute it and/or modify |
214 | it under the same terms as perl itself. |
215 | |
216 | =cut |
217 | |
218 | 1; |