1 package Sub::Exporter::Progressive;
6 our $VERSION = '0.001005';
8 use List::Util 'first';
11 my ($self, @args) = @_;
13 my $inner_target = caller(0);
14 my ($TOO_COMPLICATED, $export_data) = sub_export_options($inner_target, @args);
16 die <<'DEATH' if $TOO_COMPLICATED;
17 You are using Sub::Exporter::Progressive, but the features your program uses from
18 Sub::Exporter cannot be implemented without Sub::Exporter, so you might as well
19 just use vanilla Sub::Exporter
24 @{"${inner_target}::EXPORT_OK"} = @{$export_data->{exports}};
25 @{"${inner_target}::EXPORT"} = @{$export_data->{defaults}};
26 *{"${inner_target}::import"} = sub {
28 my ($self, @args) = @_;
30 if (first { ref || !m/^\w+$/ } @args) {
31 die 'your usage of Sub::Exporter::Progressive requires Sub::Exporter to be installed'
32 unless eval { require Sub::Exporter };
34 Sub::Exporter::build_exporter($export_data->{original});
39 goto \&Exporter::import;
44 sub sub_export_options {
45 my ($inner_target, $setup, $options) = @_;
47 my $TOO_COMPLICATED = 0;
52 if ($setup eq '-setup') {
53 my %options = %$options;
56 for my $opt (keys %options) {
57 if ($opt eq 'exports') {
59 $TOO_COMPLICATED = 1, last OPTIONS
60 if ref $options{exports} ne 'ARRAY';
62 @exports = @{$options{exports}};
64 $TOO_COMPLICATED = 1, last OPTIONS
65 if first { ref } @exports;
67 } elsif ($opt eq 'groups') {
69 $TOO_COMPLICATED = 1, last OPTIONS
70 if first { $_ ne 'default' } keys %{$options{groups}};
72 @defaults = @{$options{groups}{default} || [] };
78 @defaults = @exports if @defaults && $defaults[0] eq '-all';
79 my @errors = grep { my $default = $_; !grep { $default eq $_ } @exports } @defaults;
80 die join(', ', @errors) . " is not exported by the $inner_target module\n" if @errors;
83 return $TOO_COMPLICATED, {
85 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> and C<@EXPORT_OK> package
129 variables for C<Exporter> to work. Additionally, if your package uses advanced
130 C<Sub::Exporter> features like currying, this module will only ever use
131 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>
145 Copyright (c) 2012 the Sub::Exporter::Progressive L</AUTHOR> and
146 L</CONTRIBUTORS> as listed above.
150 This library is free software and may be distributed under the same terms