1Tidy(3)               User Contributed Perl Documentation              Tidy(3)
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3
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NAME

6       Exporter::Tidy - Another way of exporting symbols
7

SYNOPSIS

9           package MyModule::HTTP;
10           use Exporter::Tidy
11               default => [ qw(get) ],
12               other   => [ qw(post head) ];
13
14           use MyModule::HTTP qw(:all);
15           use MyModule::HTTP qw(:default post);
16           use MyModule::HTTP qw(post);
17           use MyModule::HTTP _prefix => 'http_', qw(get post);
18           use MyModule::HTTP qw(get post), _prefix => 'http_', qw(head);
19           use MyModule::HTTP
20               _prefix => 'foo', qw(get post),
21               _prefix => 'bar', qw(get head);
22
23           package MyModule::Foo;
24           use Exporter::Tidy
25               default => [ qw($foo $bar quux) ],
26               _map    => {
27                   '$foo' => \$my_foo,
28                   '$bar' => \$my_bar,
29                   quux => sub { print "Hello, world!\n" }
30               };
31
32           package MyModule::Constants;
33           use Exporter::Tidy
34               default => [ qw(:all) ],
35               _map => {
36                   FOO     => sub () { 1 },
37                   BAR     => sub () { 2 },
38                   OK      => sub () { 1 },
39                   FAILURE => sub () { 0 }
40               };
41

DESCRIPTION

43       This module serves as an easy, clean alternative to Exporter. Unlike
44       Exporter, it is not subclassed, but it simply exports a custom import()
45       into your namespace.
46
47       With Exporter::Tidy, you don't need to use any package global in your
48       module. Even the subs you export can be lexically scoped.
49
50   use Exporter::Tidy LIST
51       The list supplied to "use Exporter::Tidy" should be a key-value list.
52       Each key serves as a tag, used to group exportable symbols. The values
53       in this key-value list should be array references.  There are a few
54       special tags:
55
56       all       If you don't provide an "all" tag yourself, Tidy::Exporter
57                 will generate one for you. It will contain all exportable
58                 symbols.
59
60       default   The "default" tag will be used if the user supplies no list
61                 to the "use" statement.
62
63       _map      With _map you should not use an array reference, but a hash
64                 reference. Here, you can rewrite symbols to other names or
65                 even define one on the spot by using a reference. You can
66                 "foo => 'bar'" to export "bar" if "foo" is requested.
67
68   Exportable symbols
69       Every symbol specified in a tag's array, or used as a key in _map's
70       hash is exportable.
71
72   Symbol types
73       You can export subs, scalars, arrays, hashes and typeglobs. Do not use
74       an ampersand ("&") for subs. All other types must have the proper
75       sigil.
76
77   Importing from a module that uses Exporter::Tidy
78       You can use either a symbol name (without the sigil if it is a sub, or
79       with the appropriate sigil if it is not), or a tag name prefixed with a
80       colon. It is possible to import a symbol twice, but a symbol is never
81       exported twice under the same name, so you can use tags that overlap.
82       If you supply any list to the "use" statement, ":default" is no longer
83       used if not specified explicitly.
84
85       To avoid name clashes, it is possible to have symbols prefixed. Supply
86       "_prefix" followed by the prefix that you want. Multiple can be used.
87
88           use Some::Module qw(foo bar), _prefix => 'some_', qw(quux);
89
90       imports Some::Module::foo as foo, Some::Module::bar as bar, and
91       Some::Module::quux as some_quux. See the SYNOPSIS for more examples.
92

COMPARISON

94       Exporter::Tidy "versus" Exporter
95
96       These numbers are valid for my Linux system with Perl 5.8.0. Your
97       mileage may vary.
98
99   Speed
100       Exporting two symbols using no import list (@EXPORT and :default) is
101       approximately 10% faster with Exporter. But if you use any tag
102       explicitly, Exporter::Tidy is more than twice as fast (!) as Exporter.
103
104   Memory usage
105        perl -le'require X; print((split " ", `cat /proc/$$/stat`)[22])'
106
107        No module       3022848
108        Exporter::Tidy  3067904
109        Exporter        3084288
110        Exporter::Heavy 3174400
111
112       Exporter loads Exporter::Heavy automatically when needed. It is needed
113       to support exporter tags, amongst other things. Exporter::Tidy has all
114       functionality built into one module.
115
116       Both Exporter(::Heavy) and Exporter::Tidy delay loading Carp until it
117       is needed.
118
119   Usage
120       Exporter is subclassed and gets its information from package global
121       variables like @EXPORT, @EXPORT_OK and %EXPORT_TAGS.
122
123       Exporter::Tidy exports an "import" method and gets its information from
124       the "use" statement.
125

LICENSE

127       Pick your favourite OSI approved license :)
128
129       http://www.opensource.org/licenses/alphabetical
130

ACKNOWLEDGEMENTS

132       Thanks to Aristotle Pagaltzis for suggesting the name Exporter::Tidy.
133

AUTHOR

135       Juerd Waalboer <juerd@cpan.org> <http://juerd.nl/>
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139perl v5.30.1                      2020-01-30                           Tidy(3)