Commit | Line | Data |
6d823d74 |
1 | package Sub::Exporter::Progressive; |
2 | |
3 | # ABSTRACT: Only use Sub::Exporter if you need it |
4 | |
5 | use strict; |
6 | use warnings; |
7 | |
8 | use List::Util 'first'; |
9 | |
10 | sub import { |
11 | my ($self, @args) = @_; |
12 | |
13 | my $inner_target = caller(0); |
14 | my ($TOO_COMPLICATED, $export_data) = sub_export_options(@args); |
15 | |
16 | if ($TOO_COMPLICATED) { |
17 | warn <<'WARNING'; |
18 | You are using Sub::Exporter::Progressive, but the features your program uses from |
19 | Sub::Exporter cannot be implemented without Sub::Exporter, so you might as well |
20 | just use vanilla Sub::Exporter |
21 | WARNING |
22 | require Sub::Exporter; |
23 | goto \&Sub::Exporter::import; |
24 | } |
25 | else { |
26 | my $full_exporter; |
27 | no strict; |
28 | @{"${inner_target}::EXPORT_OK"} = @{$export_data->{exports}}; |
29 | @{"${inner_target}::EXPORT"} = @{$export_data->{defaults}}; |
30 | *{"${inner_target}::import"} = sub { |
31 | use strict; |
32 | my ($self, @args) = @_; |
33 | |
34 | if (first { ref || !m/^\w+$/ } @args) { |
35 | require Sub::Exporter; |
36 | $full_exporter ||= |
37 | Sub::Exporter::build_exporter($export_data->{original}); |
38 | |
39 | goto $full_exporter; |
40 | } else { |
41 | require Exporter; |
42 | goto \&Exporter::import; |
43 | } |
44 | }; |
45 | } |
46 | } |
47 | |
48 | sub sub_export_options { |
49 | my ($setup, $options) = @_; |
50 | |
51 | my $TOO_COMPLICATED = 0; |
52 | |
53 | my @exports; |
54 | my @defaults; |
55 | |
56 | if ($setup eq '-setup') { |
57 | my %options = %$options; |
58 | |
59 | OPTIONS: |
60 | for my $opt (keys %options) { |
61 | if ($opt eq 'exports') { |
62 | |
63 | $TOO_COMPLICATED = 1, last OPTIONS |
64 | if ref $options{exports} ne 'ARRAY'; |
65 | |
66 | @exports = @{$options{exports}}; |
67 | |
68 | $TOO_COMPLICATED = 1, last OPTIONS |
69 | if first { ref } @exports; |
70 | |
71 | } elsif ($opt eq 'groups') { |
72 | |
73 | $TOO_COMPLICATED = 1, last OPTIONS |
74 | if first { $_ ne 'default' } keys %{$options{groups}}; |
75 | |
76 | @defaults = @{$options{groups}{default} || [] }; |
77 | @defaults = @exports if $defaults[0] eq '-all'; |
78 | } else { |
79 | $TOO_COMPLICATED = 1; |
80 | last OPTIONS |
81 | } |
82 | } |
83 | } |
84 | |
85 | return $TOO_COMPLICATED, { |
86 | exports => \@exports, |
87 | defaults => \@defaults, |
88 | original => $options, |
89 | } |
90 | } |
91 | |
92 | 1; |
93 | |
94 | =head1 SYNOPSIS |
95 | |
96 | package Syntax::Keyword::Gather; |
97 | |
98 | use Sub::Exporter::Progressive -setup => { |
99 | exports => [qw( break gather gathered take )], |
100 | groups => { |
101 | defaults => [qw( break gather gathered take )], |
102 | }, |
103 | }; |
104 | |
105 | # elsewhere |
106 | |
107 | # uses Exporter for speed |
108 | use Syntax::Keyword::Gather; |
109 | |
110 | # somewhere else |
111 | |
112 | # uses Sub::Exporter for features |
113 | use Syntax::Keyword::Gather 'gather', take => { -as => 'grab' }; |
114 | |
115 | =head1 DESCRIPTION |
116 | |
117 | L<Sub::Exporter> is an incredibly powerful module, but with that power comes |
118 | great responsibility, er- as well as some runtime penalties. This module |
119 | is a C<Sub::Exporter> wrapper that will let your users just use L<Exporter> |
120 | if all they are doing is picking exports, but use C<Sub::Exporter> if your |
121 | users try to use C<Sub::Exporter>'s more advanced features features, like |
122 | renaming exports, if they try to use them. |
123 | |
124 | Note that this module will export C<@EXPORT> and C<@EXPORT_OK> package |
125 | variables for C<Exporter> to work. Additionally, if your package uses advanced |
126 | C<Sub::Exporter> features like currying, this module will only ever use |
127 | C<Sub::Exporter>, so you might as well use it directly. |