Commit | Line | Data |
6d823d74 |
1 | package Sub::Exporter::Progressive; |
2 | |
6d823d74 |
3 | use strict; |
4 | use warnings; |
5 | |
439b5e83 |
6 | our $VERSION = '0.001005'; |
18f84e12 |
7 | |
6d823d74 |
8 | use List::Util 'first'; |
9 | |
10 | sub import { |
11 | my ($self, @args) = @_; |
12 | |
13 | my $inner_target = caller(0); |
14 | my ($TOO_COMPLICATED, $export_data) = sub_export_options(@args); |
15 | |
113a844b |
16 | die <<'DEATH' if $TOO_COMPLICATED; |
6d823d74 |
17 | You are using Sub::Exporter::Progressive, but the features your program uses from |
18 | Sub::Exporter cannot be implemented without Sub::Exporter, so you might as well |
19 | just use vanilla Sub::Exporter |
113a844b |
20 | DEATH |
21 | |
22 | my $full_exporter; |
23 | no strict; |
24 | @{"${inner_target}::EXPORT_OK"} = @{$export_data->{exports}}; |
25 | @{"${inner_target}::EXPORT"} = @{$export_data->{defaults}}; |
26 | *{"${inner_target}::import"} = sub { |
27 | use strict; |
28 | my ($self, @args) = @_; |
29 | |
30 | if (first { ref || !m/^\w+$/ } @args) { |
31 | die 'your usage of Sub::Exporter::Progressive requires Sub::Exporter to be installed' |
32 | unless eval { require Sub::Exporter }; |
33 | $full_exporter ||= |
34 | Sub::Exporter::build_exporter($export_data->{original}); |
35 | |
36 | goto $full_exporter; |
37 | } else { |
38 | require Exporter; |
39 | goto \&Exporter::import; |
40 | } |
41 | }; |
6d823d74 |
42 | } |
43 | |
44 | sub sub_export_options { |
45 | my ($setup, $options) = @_; |
46 | |
47 | my $TOO_COMPLICATED = 0; |
48 | |
49 | my @exports; |
50 | my @defaults; |
51 | |
52 | if ($setup eq '-setup') { |
53 | my %options = %$options; |
54 | |
55 | OPTIONS: |
56 | for my $opt (keys %options) { |
57 | if ($opt eq 'exports') { |
58 | |
59 | $TOO_COMPLICATED = 1, last OPTIONS |
60 | if ref $options{exports} ne 'ARRAY'; |
61 | |
62 | @exports = @{$options{exports}}; |
63 | |
64 | $TOO_COMPLICATED = 1, last OPTIONS |
65 | if first { ref } @exports; |
66 | |
67 | } elsif ($opt eq 'groups') { |
68 | |
69 | $TOO_COMPLICATED = 1, last OPTIONS |
70 | if first { $_ ne 'default' } keys %{$options{groups}}; |
71 | |
72 | @defaults = @{$options{groups}{default} || [] }; |
6d823d74 |
73 | } else { |
74 | $TOO_COMPLICATED = 1; |
75 | last OPTIONS |
76 | } |
77 | } |
f2a5ea8a |
78 | @defaults = @exports if @defaults && $defaults[0] eq '-all'; |
6d823d74 |
79 | } |
80 | |
81 | return $TOO_COMPLICATED, { |
82 | exports => \@exports, |
83 | defaults => \@defaults, |
84 | original => $options, |
85 | } |
86 | } |
87 | |
88 | 1; |
89 | |
62a442f8 |
90 | =encoding utf8 |
91 | |
5cf6a81d |
92 | =head1 NAME |
93 | |
94 | Sub::Exporter::Progressive - Only use Sub::Exporter if you need it |
95 | |
6d823d74 |
96 | =head1 SYNOPSIS |
97 | |
98 | package Syntax::Keyword::Gather; |
99 | |
100 | use Sub::Exporter::Progressive -setup => { |
101 | exports => [qw( break gather gathered take )], |
102 | groups => { |
103 | defaults => [qw( break gather gathered take )], |
104 | }, |
105 | }; |
106 | |
107 | # elsewhere |
108 | |
109 | # uses Exporter for speed |
110 | use Syntax::Keyword::Gather; |
111 | |
112 | # somewhere else |
113 | |
114 | # uses Sub::Exporter for features |
115 | use Syntax::Keyword::Gather 'gather', take => { -as => 'grab' }; |
116 | |
117 | =head1 DESCRIPTION |
118 | |
119 | L<Sub::Exporter> is an incredibly powerful module, but with that power comes |
120 | great responsibility, er- as well as some runtime penalties. This module |
121 | is a C<Sub::Exporter> wrapper that will let your users just use L<Exporter> |
122 | if all they are doing is picking exports, but use C<Sub::Exporter> if your |
123 | users try to use C<Sub::Exporter>'s more advanced features features, like |
124 | renaming exports, if they try to use them. |
125 | |
126 | Note that this module will export C<@EXPORT> and C<@EXPORT_OK> package |
127 | variables for C<Exporter> to work. Additionally, if your package uses advanced |
128 | C<Sub::Exporter> features like currying, this module will only ever use |
129 | C<Sub::Exporter>, so you might as well use it directly. |
5cf6a81d |
130 | |
131 | =head1 AUTHOR |
132 | |
133 | frew - Arthur Axel Schmidt (cpan:FREW) <frioux+cpan@gmail.com> |
134 | |
135 | =head1 CONTRIBUTORS |
136 | |
137 | ilmari - Dagfinn Ilmari Mannsåker (cpan:ILMARI) <ilmari@ilmari.org> |
138 | |
139 | mst - Matt S. Trout (cpan:MSTROUT) <mst@shadowcat.co.uk> |
140 | |
141 | =head1 COPYRIGHT |
142 | |
143 | Copyright (c) 2012 the Sub::Exporter::Progressive L</AUTHOR> and |
144 | L</CONTRIBUTORS> as listed above. |
145 | |
146 | =head1 LICENSE |
147 | |
148 | This library is free software and may be distributed under the same terms |
149 | as perl itself. |
150 | |
151 | =cut |