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1 | package MooseX::Types::Combine; |
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2 | |
3 | # ABSTRACT: Combine type libraries for exporting |
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4 | |
5 | use strict; |
6 | use warnings; |
7 | use Class::MOP (); |
8 | |
9 | =head1 SYNOPSIS |
10 | |
11 | package CombinedTypeLib; |
12 | |
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13 | use base 'MooseX::Types::Combine'; |
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14 | |
15 | __PACKAGE__->provide_types_from(qw/TypeLib1 TypeLib2/); |
16 | |
17 | package UserClass; |
18 | |
19 | use CombinedTypeLib qw/Type1 Type2 ... /; |
20 | |
21 | =head1 DESCRIPTION |
22 | |
23 | Allows you to export types from multiple type libraries. |
24 | |
25 | Libraries on the right side of the type libs passed to L</provide_types_from> |
26 | take precedence over those on the left in case of conflicts. |
27 | |
28 | =cut |
29 | |
30 | sub import { |
31 | my ($class, @types) = @_; |
32 | my $caller = caller; |
33 | |
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34 | my %types = $class->_provided_types; |
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35 | |
36 | my %from; |
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37 | for my $type (@types) { |
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38 | unless ($types{$type}) { |
39 | my @type_libs = $class->provide_types_from; |
40 | |
41 | die |
42 | "$caller asked for a type ($type) which is not found in any of the" |
43 | . " type libraries (@type_libs) combined by $class\n"; |
44 | } |
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45 | |
46 | push @{ $from{ $types{$type} } }, $type; |
47 | } |
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48 | |
49 | $_->import({ -into => $caller }, @{ $from{ $_ } }) |
50 | for keys %from; |
51 | } |
52 | |
53 | =head1 CLASS METHODS |
54 | |
55 | =head2 provide_types_from |
56 | |
57 | Sets or returns a list of type libraries to re-export from. |
58 | |
59 | =cut |
60 | |
61 | sub provide_types_from { |
62 | my ($class, @libs) = @_; |
63 | |
64 | my $store = |
65 | do { no strict 'refs'; \@{ "${class}::__MOOSEX_TYPELIBRARY_LIBRARIES" } }; |
66 | |
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67 | if (@libs) { |
68 | $class->_check_type_lib($_) for @libs; |
69 | @$store = @libs; |
70 | |
71 | my %types = map { |
72 | my $lib = $_; |
73 | map +( $_ => $lib ), $lib->type_names |
74 | } @libs; |
75 | |
76 | $class->_provided_types(%types); |
77 | } |
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78 | |
79 | @$store; |
80 | } |
81 | |
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82 | sub _check_type_lib { |
83 | my ($class, $lib) = @_; |
84 | |
85 | Class::MOP::load_class($lib); |
86 | |
87 | die "Cannot use $lib in a combined type library, it does not provide any types" |
88 | unless $lib->can('type_names'); |
89 | } |
90 | |
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91 | sub _provided_types { |
92 | my ($class, %types) = @_; |
93 | |
94 | my $types = |
95 | do { no strict 'refs'; \%{ "${class}::__MOOSEX_TYPELIBRARY_TYPES" } }; |
96 | |
97 | %$types = %types |
98 | if keys %types; |
99 | |
100 | %$types; |
101 | } |
102 | |
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103 | =head1 SEE ALSO |
104 | |
105 | L<MooseX::Types> |
106 | |
107 | =head1 LICENSE |
108 | |
109 | This program is free software; you can redistribute it and/or modify |
110 | it under the same terms as perl itself. |
111 | |
112 | =cut |
113 | |
114 | 1; |