Exporter::Lite โ lightweight exporting of functions and variables
| Use Case | Code / Command | Description |
|---|---|---|
| ๐ฆ Define default exports | package Foo; use Exporter::Lite; our @EXPORT = qw($This That); | Makes $This and That() automatically exported when using the module. |
| ๐ Define optional exports | our @EXPORT_OK = qw(@Left %Right); | Lets users optionally import @Left and %Right. |
| โฌ๏ธ Import all defaults | use Foo; | Imports every symbol from @EXPORT. |
| ๐ฏ Import specific symbols | use Foo qw($This); | Imports only $This; any default exports are ignored unless listed. |
| ๐งช Import optional + default | use Games qw(pacman galaga); | Imports pacman (default) and galaga (optional); must list all desired symbols explicitly. |
package Foo;
use Exporter::Lite;
our @EXPORT = qw($This That); # default exports
our @EXPORT_OK = qw(@Left %Right); # optional exports
Then in code using the module:
use Foo;
# $This and &That are imported here
You have to explicitly ask for optional exports:
use Foo qw/ @Left %Right /;
Exporter::Lite is an alternative to Exporter, intended to provide a lightweight subset of the most commonlyโused functionality. It supports import(), @EXPORT and @EXPORT_OK and not a whole lot else.
Unlike Exporter, it is not necessary to inherit from Exporter::Lite; i.e. you donโt need to write:
@ISA = qw(Exporter::Lite);
Exporter::Lite simply exports its import() function into your namespace. This might be called a โmixโinโ or a โroleโ.
Setting up a module to export its variables and functions is simple:
package My::Module;
use Exporter::Lite;
our @EXPORT = qw($Foo bar);
Functions and variables listed in the @EXPORT package variable are automatically exported if you use the module and donโt explicitly list any imports. Now, when you use My::Module, $Foo and bar() will show up.
Optional exports are listed in the @EXPORT_OK package variable:
package My::Module;
use Exporter::Lite;
our @EXPORT_OK = qw($Foo bar);
When My::Module is used, $Foo and bar() will not show up, unless you explicitly ask for them:
use My::Module qw($Foo bar);
Note that when you specify one or more functions or variables to import, you must also explicitly list any of the default symbols you want to use. So if you have an exporting module:
package Games;
our @EXPORT = qw/ pacman defender /;
our @EXPORT_OK = qw/ galaga centipede /;
Then if you want to use both pacman and galaga, you would write:
use Games qw/ pacman galaga /;
Export::Lite has one public method, import(), which is called automatically when your modules is use()'d.
In normal usage you donโt have to worry about this at all.
Some::Module->import;
Some::Module->import(@symbols);
Works just like Exporter::import() excepting it only honors @Some::Module::EXPORT and @Some::Module::EXPORT_OK.
The given @symbols are exported to the current package provided they are in @Some::Module::EXPORT or @Some::Module::EXPORT_OK. Otherwise an exception is thrown (i.e. the program dies).
If @symbols is not given, everything in @Some::Module::EXPORT is exported.
"%s" is not exported by the %s module โ Attempted to import a symbol which is not in @EXPORT or @EXPORT_OK.Can\'t export symbol: %s โ Attempted to import a symbol of an unknown type (i.e. the leading $@% salad wasnโt recognized).https://github.com/neilb/Exporter-Lite
Michael G Schwern <schwern AT pobox.com>
This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
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