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Load.pm
package Module::Load; $VERSION = '0.32'; use strict; use warnings; use File::Spec (); sub import { my $who = _who(); my $h; shift; { no strict 'refs'; @_ or ( *{"${who}::load"} = \&load, # compat to prev version *{"${who}::autoload"} = \&autoload, return ); map { $h->{$_} = () if defined $_ } @_; (exists $h->{none} or exists $h->{''}) and shift, last; ((exists $h->{autoload} and shift,1) or (exists $h->{all} and shift)) and *{"${who}::autoload"} = \&autoload; ((exists $h->{load} and shift,1) or exists $h->{all}) and *{"${who}::load"} = \&load; ((exists $h->{load_remote} and shift,1) or exists $h->{all}) and *{"${who}::load_remote"} = \&load_remote; ((exists $h->{autoload_remote} and shift,1) or exists $h->{all}) and *{"${who}::autoload_remote"} = \&autoload_remote; } } sub load(*;@){ goto &_load; } sub autoload(*;@){ unshift @_, 'autoimport'; goto &_load; } sub load_remote($$;@){ my ($dst, $src, @exp) = @_; eval "package $dst;Module::Load::load('$src', qw/@exp/);"; $@ && die "$@"; } sub autoload_remote($$;@){ my ($dst, $src, @exp) = @_; eval "package $dst;Module::Load::autoload('$src', qw/@exp/);"; $@ && die "$@"; } sub _load{ my $autoimport = $_[0] eq 'autoimport' and shift; my $mod = shift or return; my $who = _who(); if( _is_file( $mod ) ) { require $mod; } else { LOAD: { my $err; for my $flag ( qw[1 0] ) { my $file = _to_file( $mod, $flag); eval { require $file }; $@ ? $err .= $@ : last LOAD; } die $err if $err; } } ### This addresses #41883: Module::Load cannot import ### non-Exporter module. ->import() routines weren't ### properly called when load() was used. { no strict 'refs'; my $import; ((@_ or $autoimport) and ( $import = $mod->can('import') ) and ( unshift(@_, $mod), goto &$import, return ) ); } } sub _to_file{ local $_ = shift; my $pm = shift || ''; ## trailing blanks ignored by default. [rt #69886] my @parts = split /::|'/, $_, -1; ## make sure that we can't hop out of @INC shift @parts if @parts && !$parts[0]; ### because of [perl #19213], see caveats ### my $file = $^O eq 'MSWin32' ? join "/", @parts : File::Spec->catfile( @parts ); $file .= '.pm' if $pm; ### on perl's before 5.10 (5.9.5@31746) if you require ### a file in VMS format, it's stored in %INC in VMS ### format. Therefor, better unixify it first ### Patch in reply to John Malmbergs patch (as mentioned ### above) on p5p Tue 21 Aug 2007 04:55:07 $file = VMS::Filespec::unixify($file) if $^O eq 'VMS'; return $file; } sub _who { (caller(1))[0] } sub _is_file { local $_ = shift; return /^\./ ? 1 : /[^\w:']/ ? 1 : undef #' silly bbedit.. } 1; __END__ =pod =head1 NAME Module::Load - runtime require of both modules and files =head1 SYNOPSIS 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]' =head1 DESCRIPTION C<Module::Load> eliminates the need to know whether you are trying to require either a file or a module. If you consult C<perldoc -f require> you will see that C<require> will behave differently when given a bareword or a string. In the case of a string, C<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 (C<Acme::Comment>) to a file notation fitting the particular platform you are on. C<Module::Load> eliminates the need for this overhead and will just DWYM. =head2 Difference between C<load> and C<autoload> C<Module::Load> imports the two functions - C<load> and C<autoload> C<autoload> imports the default functions automatically, but C<load> do not import any functions. C<autoload> is usable under C<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/; =head1 FUNCTIONS =over 4 =item load Loads a specified module. See L</Rules> for detailed loading rule. =item autoload Loads a specified module and imports the default functions. Except importing the functions, 'autoload' is same as 'load'. =item load_remote 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'. =item autoload_remote 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 A module for loading must be quoted. Except specifing the package and quoting module name, 'autoload_remote' is same as 'load_remote'. =back =head1 Rules All functions have the following rules to decide what it thinks you want: =over 4 =item * If the argument has any characters in it other than those matching C<\w>, C<:> or C<'>, it must be a file =item * If the argument matches only C<[\w:']>, it must be a module =item * If the argument matches only C<\w>, it could either be a module or a file. We will try to find C<file.pm> first in C<@INC> and if that fails, we will try to find C<file> in @INC. If both fail, we die with the respective error messages. =back =head1 IMPORTS THE FUNCTIONS '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'. =over 4 =item "load","autoload","load_remote","autoload_remote" 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/; =item 'all' Imports all the functions. use Module::Load 'all'; # imports load, autoload, load_remote, autoload_remote =item '','none',undef Not import any functions (C<load> and C<autoload> are not imported). use Module::Load ''; use Module::Load 'none'; use Module::Load undef; =back =head1 Caveats 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 C</>, like on Unix rather than the Win32 C<\>. Otherwise perl will not read its own %INC accurately double load files if they are required again, or in the worst case, core dump. C<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' C<@EXPORT>) =head1 ACKNOWLEDGEMENTS Thanks to Jonas B. Nielsen for making explicit imports work. =head1 BUG REPORTS Please report bugs or other issues to E<lt>bug-module-load@rt.cpan.org<gt>. =head1 AUTHOR This module by Jos Boumans E<lt>kane@cpan.orgE<gt>. =head1 COPYRIGHT This library is free software; you may redistribute and/or modify it under the same terms as Perl itself. =cut
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