1 package Sub::Exporter::Progressive;
6 our $VERSION = '0.001007';
9 use List::Util 'first';
12 my ($self, @args) = @_;
14 my $inner_target = caller(0);
15 my $export_data = sub_export_options($inner_target, @args);
19 @{"${inner_target}::EXPORT_OK"} = @{$export_data->{exports}};
20 @{"${inner_target}::EXPORT"} = @{$export_data->{defaults}};
21 %{"${inner_target}::EXPORT_TAGS"} = %{$export_data->{tags}};
22 *{"${inner_target}::import"} = sub {
24 my ($self, @args) = @_;
26 if (first { ref || !m/ \A [:-]? \w+ \z /xm } @args) {
27 croak 'your usage of Sub::Exporter::Progressive requires Sub::Exporter to be installed'
28 unless eval { require Sub::Exporter };
30 Sub::Exporter::build_exporter($export_data->{original});
35 s/ \A - /:/xm for @args;
37 goto \&Exporter::import;
42 my $too_complicated = <<'DEATH';
43 You are using Sub::Exporter::Progressive, but the features your program uses from
44 Sub::Exporter cannot be implemented without Sub::Exporter, so you might as well
45 just use vanilla Sub::Exporter
48 sub sub_export_options {
49 my ($inner_target, $setup, $options) = @_;
55 if ($setup eq '-setup') {
56 my %options = %$options;
59 for my $opt (keys %options) {
60 if ($opt eq 'exports') {
62 croak $too_complicated if ref $options{exports} ne 'ARRAY';
63 @exports = @{$options{exports}};
64 croak $too_complicated if first { ref } @exports;
66 } elsif ($opt eq 'groups') {
67 %tags = %{$options{groups}};
68 for my $tagset (values %tags) {
69 croak $too_complicated if first { /^-(?!all\b)/ || ref } @{$tagset};
71 @defaults = @{$tags{default} || [] };
73 croak $too_complicated;
76 @{$_} = map { / \A [:-] all \z /x ? @exports : $_ } @{$_} for \@defaults, values %tags;
77 $tags{all} ||= [ @exports ];
78 my @errors = grep { my $default = $_; !grep { $default eq $_ } @exports } @defaults;
79 die join(', ', @errors) . " is not exported by the $inner_target module\n" if @errors;
84 defaults => \@defaults,
96 Sub::Exporter::Progressive - Only use Sub::Exporter if you need it
100 package Syntax::Keyword::Gather;
102 use Sub::Exporter::Progressive -setup => {
103 exports => [qw( break gather gathered take )],
105 defaults => [qw( break gather gathered take )],
111 # uses Exporter for speed
112 use Syntax::Keyword::Gather;
116 # uses Sub::Exporter for features
117 use Syntax::Keyword::Gather 'gather', take => { -as => 'grab' };
121 L<Sub::Exporter> is an incredibly powerful module, but with that power comes
122 great responsibility, er- as well as some runtime penalties. This module
123 is a C<Sub::Exporter> wrapper that will let your users just use L<Exporter>
124 if all they are doing is picking exports, but use C<Sub::Exporter> if your
125 users try to use C<Sub::Exporter>'s more advanced features features, like
126 renaming exports, if they try to use them.
128 Note that this module will export C<@EXPORT>, C<@EXPORT_OK> and
129 C<%EXPORT_TAGS> package variables for C<Exporter> to work. Additionally, if
130 your package uses advanced C<Sub::Exporter> features like currying, this module
131 will only ever use C<Sub::Exporter>, so you might as well use it directly.
135 frew - Arthur Axel Schmidt (cpan:FREW) <frioux+cpan@gmail.com>
139 ilmari - Dagfinn Ilmari Mannsåker (cpan:ILMARI) <ilmari@ilmari.org>
141 mst - Matt S. Trout (cpan:MSTROUT) <mst@shadowcat.co.uk>
143 leont - Leon Timmermans (cpan:LEONT) <leont@cpan.org>
147 Copyright (c) 2012 the Sub::Exporter::Progressive L</AUTHOR> and
148 L</CONTRIBUTORS> as listed above.
152 This library is free software and may be distributed under the same terms