Module::Load - runtime require of both modules and files
use Module::Load; my $module = 'Data::Dumper'; load Data::Dumper; # loads that module, but not import any functions # -> cannot use 'Dumper' function load 'Data::Dumper'; # ditto load $module # tritto autoload Data::Dumper; # loads that module and imports the default functions # -> can use 'Dumper' function my $script = 'some/script.pl' load $script; load 'some/script.pl'; # use quotes because of punctuations load thing; # try 'thing' first, then 'thing.pm' load CGI, ':all'; # like 'use CGI qw[:standard]'
Module::Load eliminates the need to know whether you are trying to require either a file or a module.
Module::Load
If you consult perldoc -f require you will see that require will behave differently when given a bareword or a string.
perldoc -f require
require
In the case of a string, require assumes you are wanting to load a file. But in the case of a bareword, it assumes you mean a module.
This gives nasty overhead when you are trying to dynamically require modules at runtime, since you will need to change the module notation (Acme::Comment) to a file notation fitting the particular platform you are on.
Acme::Comment
Module::Load eliminates the need for this overhead and will just DWYM.
load
autoload
Module::Load imports the two functions - load and autoload
autoload imports the default functions automatically, but load do not import any functions.
autoload is usable under BEGIN{};.
BEGIN{};
Both the functions can import the functions that are specified.
Following codes are same.
load File::Spec::Functions, qw/splitpath/; autoload File::Spec::Functions, qw/splitpath/;
Loads a specified module.
See "Rules" for detailed loading rule.
Loads a specified module and imports the default functions.
Except importing the functions, 'autoload' is same as 'load'.
Loads a specified module to the specified package.
use Module::Load 'load_remote'; my $pkg = 'Other::Package'; load_remote $pkg, 'Data::Dumper'; # load a module to 'Other::Package' # but do not import 'Dumper' function
A module for loading must be quoted.
Except specifing the package and quoting module name, 'load_remote' is same as 'load'.
Loads a specified module and imports the default functions to the specified package.
use Module::Load 'autoload_remote'; my $pkg = 'Other::Package'; autoload_remote $pkg, 'Data::Dumper'; # load a module to 'Other::Package' # and imports 'Dumper' function
Except specifing the package and quoting module name, 'autoload_remote' is same as 'load_remote'.
All functions have the following rules to decide what it thinks you want:
If the argument has any characters in it other than those matching \w, : or ', it must be a file
\w
:
'
If the argument matches only [\w:'], it must be a module
[\w:']
If the argument matches only \w, it could either be a module or a file. We will try to find file.pm first in @INC and if that fails, we will try to find file in @INC. If both fail, we die with the respective error messages.
file.pm
@INC
file
'load' and 'autoload' are imported by default, but 'load_remote' and 'autoload_remote' are not imported.
To use 'load_remote' or 'autoload_remote', specify at 'use'.
Imports the selected functions.
# imports 'load' and 'autoload' (default) use Module::Load; # imports 'autoload' only use Module::Load 'autoload'; # imports 'autoload' and 'autoload_remote', but don't import 'load'; use Module::Load qw/autoload autoload_remote/;
Imports all the functions.
use Module::Load 'all'; # imports load, autoload, load_remote, autoload_remote
Not import any functions (load and autoload are not imported).
use Module::Load ''; use Module::Load 'none'; use Module::Load undef;
Because of a bug in perl (#19213), at least in version 5.6.1, we have to hardcode the path separator for a require on Win32 to be /, like on Unix rather than the Win32 \. Otherwise perl will not read its own %INC accurately double load files if they are required again, or in the worst case, core dump.
/
\
Module::Load cannot do implicit imports, only explicit imports. (in other words, you always have to specify explicitly what you wish to import from a module, even if the functions are in that modules' @EXPORT)
@EXPORT
Thanks to Jonas B. Nielsen for making explicit imports work.
Please report bugs or other issues to <bug-module-load@rt.cpan.org<gt>.
This module by Jos Boumans <kane@cpan.org>.
This library is free software; you may redistribute and/or modify it under the same terms as Perl itself.
To install Module::Load, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Module::Load
CPAN shell
perl -MCPAN -e shell install Module::Load
For more information on module installation, please visit the detailed CPAN module installation guide.