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files >> //proc/thread-self/root/proc/self/root/proc/self/root/usr/share/perl5/vendor_perl/Sub/Install.pm
use strict; use warnings; package Sub::Install; # ABSTRACT: install subroutines into packages easily $Sub::Install::VERSION = '0.928'; use Carp; use Scalar::Util (); #pod =head1 SYNOPSIS #pod #pod use Sub::Install; #pod #pod Sub::Install::install_sub({ #pod code => sub { ... }, #pod into => $package, #pod as => $subname #pod }); #pod #pod =head1 DESCRIPTION #pod #pod This module makes it easy to install subroutines into packages without the #pod unsightly mess of C<no strict> or typeglobs lying about where just anyone can #pod see them. #pod #pod =func install_sub #pod #pod Sub::Install::install_sub({ #pod code => \&subroutine, #pod into => "Finance::Shady", #pod as => 'launder', #pod }); #pod #pod This routine installs a given code reference into a package as a normal #pod subroutine. The above is equivalent to: #pod #pod no strict 'refs'; #pod *{"Finance::Shady" . '::' . "launder"} = \&subroutine; #pod #pod If C<into> is not given, the sub is installed into the calling package. #pod #pod If C<code> is not a code reference, it is looked for as an existing sub in the #pod package named in the C<from> parameter. If C<from> is not given, it will look #pod in the calling package. #pod #pod If C<as> is not given, and if C<code> is a name, C<as> will default to C<code>. #pod If C<as> is not given, but if C<code> is a code ref, Sub::Install will try to #pod find the name of the given code ref and use that as C<as>. #pod #pod That means that this code: #pod #pod Sub::Install::install_sub({ #pod code => 'twitch', #pod from => 'Person::InPain', #pod into => 'Person::Teenager', #pod as => 'dance', #pod }); #pod #pod is the same as: #pod #pod package Person::Teenager; #pod #pod Sub::Install::install_sub({ #pod code => Person::InPain->can('twitch'), #pod as => 'dance', #pod }); #pod #pod =func reinstall_sub #pod #pod This routine behaves exactly like C<L</install_sub>>, but does not emit a #pod warning if warnings are on and the destination is already defined. #pod #pod =cut sub _name_of_code { my ($code) = @_; require B; my $name = B::svref_2object($code)->GV->NAME; return $name unless $name =~ /\A__ANON__/; return; } # See also Params::Util, to which this code was donated. sub _CODELIKE { (Scalar::Util::reftype($_[0])||'') eq 'CODE' || Scalar::Util::blessed($_[0]) && (overload::Method($_[0],'&{}') ? $_[0] : undef); } # do the heavy lifting sub _build_public_installer { my ($installer) = @_; sub { my ($arg) = @_; my ($calling_pkg) = caller(0); # I'd rather use ||= but I'm whoring for Devel::Cover. for (qw(into from)) { $arg->{$_} = $calling_pkg unless $arg->{$_} } # This is the only absolutely required argument, in many cases. Carp::croak "named argument 'code' is not optional" unless $arg->{code}; if (_CODELIKE($arg->{code})) { $arg->{as} ||= _name_of_code($arg->{code}); } else { Carp::croak "couldn't find subroutine named $arg->{code} in package $arg->{from}" unless my $code = $arg->{from}->can($arg->{code}); $arg->{as} = $arg->{code} unless $arg->{as}; $arg->{code} = $code; } Carp::croak "couldn't determine name under which to install subroutine" unless $arg->{as}; $installer->(@$arg{qw(into as code) }); } } # do the ugly work my $_misc_warn_re; my $_redef_warn_re; BEGIN { $_misc_warn_re = qr/ Prototype\ mismatch:\ sub\ .+? | Constant subroutine .+? redefined /x; $_redef_warn_re = qr/Subroutine\ .+?\ redefined/x; } my $eow_re; BEGIN { $eow_re = qr/ at .+? line \d+\.\Z/ }; sub _do_with_warn { my ($arg) = @_; my $code = delete $arg->{code}; my $wants_code = sub { my $code = shift; sub { my $warn = $SIG{__WARN__} ? $SIG{__WARN__} : sub { warn @_ }; ## no critic local $SIG{__WARN__} = sub { my ($error) = @_; for (@{ $arg->{suppress} }) { return if $error =~ $_; } for (@{ $arg->{croak} }) { if (my ($base_error) = $error =~ /\A($_) $eow_re/x) { Carp::croak $base_error; } } for (@{ $arg->{carp} }) { if (my ($base_error) = $error =~ /\A($_) $eow_re/x) { return $warn->(Carp::shortmess $base_error); } } ($arg->{default} || $warn)->($error); }; $code->(@_); }; }; return $wants_code->($code) if $code; return $wants_code; } sub _installer { sub { my ($pkg, $name, $code) = @_; no strict 'refs'; ## no critic ProhibitNoStrict *{"$pkg\::$name"} = $code; return $code; } } BEGIN { *_ignore_warnings = _do_with_warn({ carp => [ $_misc_warn_re, $_redef_warn_re ] }); *install_sub = _build_public_installer(_ignore_warnings(_installer)); *_carp_warnings = _do_with_warn({ carp => [ $_misc_warn_re ], suppress => [ $_redef_warn_re ], }); *reinstall_sub = _build_public_installer(_carp_warnings(_installer)); *_install_fatal = _do_with_warn({ code => _installer, croak => [ $_redef_warn_re ], }); } #pod =func install_installers #pod #pod This routine is provided to allow Sub::Install compatibility with #pod Sub::Installer. It installs C<install_sub> and C<reinstall_sub> methods into #pod the package named by its argument. #pod #pod Sub::Install::install_installers('Code::Builder'); # just for us, please #pod Code::Builder->install_sub({ name => $code_ref }); #pod #pod Sub::Install::install_installers('UNIVERSAL'); # feeling lucky, punk? #pod Anything::At::All->install_sub({ name => $code_ref }); #pod #pod The installed installers are similar, but not identical, to those provided by #pod Sub::Installer. They accept a single hash as an argument. The key/value pairs #pod are used as the C<as> and C<code> parameters to the C<install_sub> routine #pod detailed above. The package name on which the method is called is used as the #pod C<into> parameter. #pod #pod Unlike Sub::Installer's C<install_sub> will not eval strings into code, but #pod will look for named code in the calling package. #pod #pod =cut sub install_installers { my ($into) = @_; for my $method (qw(install_sub reinstall_sub)) { my $code = sub { my ($package, $subs) = @_; my ($caller) = caller(0); my $return; for (my ($name, $sub) = %$subs) { $return = Sub::Install->can($method)->({ code => $sub, from => $caller, into => $package, as => $name }); } return $return; }; install_sub({ code => $code, into => $into, as => $method }); } } #pod =head1 EXPORTS #pod #pod Sub::Install exports C<install_sub> and C<reinstall_sub> only if they are #pod requested. #pod #pod =head2 exporter #pod #pod Sub::Install has a never-exported subroutine called C<exporter>, which is used #pod to implement its C<import> routine. It takes a hashref of named arguments, #pod only one of which is currently recognize: C<exports>. This must be an arrayref #pod of subroutines to offer for export. #pod #pod This routine is mainly for Sub::Install's own consumption. Instead, consider #pod L<Sub::Exporter>. #pod #pod =cut sub exporter { my ($arg) = @_; my %is_exported = map { $_ => undef } @{ $arg->{exports} }; sub { my $class = shift; my $target = caller; for (@_) { Carp::croak "'$_' is not exported by $class" if !exists $is_exported{$_}; install_sub({ code => $_, from => $class, into => $target }); } } } BEGIN { *import = exporter({ exports => [ qw(install_sub reinstall_sub) ] }); } #pod =head1 SEE ALSO #pod #pod =over #pod #pod =item L<Sub::Installer> #pod #pod This module is (obviously) a reaction to Damian Conway's Sub::Installer, which #pod does the same thing, but does it by getting its greasy fingers all over #pod UNIVERSAL. I was really happy about the idea of making the installation of #pod coderefs less ugly, but I couldn't bring myself to replace the ugliness of #pod typeglobs and loosened strictures with the ugliness of UNIVERSAL methods. #pod #pod =item L<Sub::Exporter> #pod #pod This is a complete Exporter.pm replacement, built atop Sub::Install. #pod #pod =back #pod #pod =head1 EXTRA CREDITS #pod #pod Several of the tests are adapted from tests that shipped with Damian Conway's #pod Sub-Installer distribution. #pod #pod =cut 1; __END__ =pod =encoding UTF-8 =head1 NAME Sub::Install - install subroutines into packages easily =head1 VERSION version 0.928 =head1 SYNOPSIS use Sub::Install; Sub::Install::install_sub({ code => sub { ... }, into => $package, as => $subname }); =head1 DESCRIPTION This module makes it easy to install subroutines into packages without the unsightly mess of C<no strict> or typeglobs lying about where just anyone can see them. =head1 FUNCTIONS =head2 install_sub Sub::Install::install_sub({ code => \&subroutine, into => "Finance::Shady", as => 'launder', }); This routine installs a given code reference into a package as a normal subroutine. The above is equivalent to: no strict 'refs'; *{"Finance::Shady" . '::' . "launder"} = \&subroutine; If C<into> is not given, the sub is installed into the calling package. If C<code> is not a code reference, it is looked for as an existing sub in the package named in the C<from> parameter. If C<from> is not given, it will look in the calling package. If C<as> is not given, and if C<code> is a name, C<as> will default to C<code>. If C<as> is not given, but if C<code> is a code ref, Sub::Install will try to find the name of the given code ref and use that as C<as>. That means that this code: Sub::Install::install_sub({ code => 'twitch', from => 'Person::InPain', into => 'Person::Teenager', as => 'dance', }); is the same as: package Person::Teenager; Sub::Install::install_sub({ code => Person::InPain->can('twitch'), as => 'dance', }); =head2 reinstall_sub This routine behaves exactly like C<L</install_sub>>, but does not emit a warning if warnings are on and the destination is already defined. =head2 install_installers This routine is provided to allow Sub::Install compatibility with Sub::Installer. It installs C<install_sub> and C<reinstall_sub> methods into the package named by its argument. Sub::Install::install_installers('Code::Builder'); # just for us, please Code::Builder->install_sub({ name => $code_ref }); Sub::Install::install_installers('UNIVERSAL'); # feeling lucky, punk? Anything::At::All->install_sub({ name => $code_ref }); The installed installers are similar, but not identical, to those provided by Sub::Installer. They accept a single hash as an argument. The key/value pairs are used as the C<as> and C<code> parameters to the C<install_sub> routine detailed above. The package name on which the method is called is used as the C<into> parameter. Unlike Sub::Installer's C<install_sub> will not eval strings into code, but will look for named code in the calling package. =head1 EXPORTS Sub::Install exports C<install_sub> and C<reinstall_sub> only if they are requested. =head2 exporter Sub::Install has a never-exported subroutine called C<exporter>, which is used to implement its C<import> routine. It takes a hashref of named arguments, only one of which is currently recognize: C<exports>. This must be an arrayref of subroutines to offer for export. This routine is mainly for Sub::Install's own consumption. Instead, consider L<Sub::Exporter>. =head1 SEE ALSO =over =item L<Sub::Installer> This module is (obviously) a reaction to Damian Conway's Sub::Installer, which does the same thing, but does it by getting its greasy fingers all over UNIVERSAL. I was really happy about the idea of making the installation of coderefs less ugly, but I couldn't bring myself to replace the ugliness of typeglobs and loosened strictures with the ugliness of UNIVERSAL methods. =item L<Sub::Exporter> This is a complete Exporter.pm replacement, built atop Sub::Install. =back =head1 EXTRA CREDITS Several of the tests are adapted from tests that shipped with Damian Conway's Sub-Installer distribution. =head1 AUTHOR Ricardo SIGNES <rjbs@cpan.org> =head1 COPYRIGHT AND LICENSE This software is copyright (c) 2005 by Ricardo SIGNES. This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself. =cut
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