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package Function::Fallback::CoreOrPP;
our $AUTHORITY = 'cpan:PERLANCAR'; # AUTHORITY
our $DATE = '2020-02-03'; # DATE
our $DIST = 'Function-Fallback-CoreOrPP'; # DIST
our $VERSION = '0.090'; # VERSION
use 5.010001;
use strict;
use warnings;
our $USE_NONCORE_XS_FIRST = 1;
require Exporter;
our @ISA = qw(Exporter);
our @EXPORT_OK = qw(
clone
clone_list
unbless
uniq
);
sub clone {
my $data = shift;
goto FALLBACK unless $USE_NONCORE_XS_FIRST;
goto FALLBACK unless eval { require Data::Clone; 1 };
STANDARD:
return Data::Clone::clone($data);
FALLBACK:
require Clone::PP;
return Clone::PP::clone($data);
}
sub clone_list {
map { clone($_) } @_;
}
sub _unbless_fallback {
my $ref = shift;
my $r = ref($ref);
# not a reference
return $ref unless $r;
# return if not a blessed ref
my ($r2, $r3) = "$ref" =~ /(.+)=(.+?)\(/
or return $ref;
if ($r3 eq 'HASH') {
return { %$ref };
} elsif ($r3 eq 'ARRAY') {
return [ @$ref ];
} elsif ($r3 eq 'SCALAR') {
return \( my $copy = ${$ref} );
} elsif ($r3 eq 'CODE') {
return sub { goto &$ref };
} else {
die "Can't handle $ref";
}
}
sub unbless {
my $ref = shift;
goto FALLBACK unless $USE_NONCORE_XS_FIRST;
goto FALLBACK unless eval { require Acme::Damn; 1 };
STANDARD:
return Acme::Damn::damn($ref);
FALLBACK:
return _unbless_fallback($ref);
}
sub uniq {
goto FALLBACK unless $USE_NONCORE_XS_FIRST;
goto FALLBACK unless eval { require List::MoreUtils; 1 };
STANDARD:
return List::MoreUtils::uniq(@_);
FALLBACK:
my %h;
my @res;
for (@_) {
push @res, $_ unless $h{$_}++;
}
return @res;
}
1;
# ABSTRACT: Functions that use non-core XS module but provide pure-Perl/core fallback
__END__
=pod
=encoding UTF-8
=head1 NAME
Function::Fallback::CoreOrPP - Functions that use non-core XS module but provide pure-Perl/core fallback
=head1 VERSION
This document describes version 0.090 of Function::Fallback::CoreOrPP (from Perl distribution Function-Fallback-CoreOrPP), released on 2020-02-03.
=head1 SYNOPSIS
use Function::Fallback::CoreOrPP qw(clone unbless uniq);
my $clone = clone({blah=>1});
my $unblessed = unbless($blessed_ref);
my @uniq = uniq(1, 3, 2, 1, 4); # -> (1, 3, 2, 4)
=head1 DESCRIPTION
This module provides functions that use non-core XS modules (for best speed,
reliability, feature, etc) but falls back to those that use core XS or pure-Perl
modules when the non-core XS module is not available.
This module helps when you want to bootstrap your Perl application with a
portable, dependency-free Perl script. In a vanilla Perl installation (having
only core modules), you can use L<App::FatPacker> to include non-core pure-Perl
dependencies to your script.
=for Pod::Coverage ^()$
=head1 FUNCTIONS
=head2 clone($data) => $cloned
Try to use L<Data::Clone>'s C<clone>, but fall back to using L<Clone::PP>'s
C<clone>.
=head2 clone_list(@data) => @data
A shortcut for:
return map {clone($_)} @data
=head2 unbless($ref) => $unblessed_ref
Try to use L<Acme::Damn>'s C<damn> to unbless a reference but fall back to
shallow copying.
NOTE: C<damn()> B<MODIFIES> the original reference. (XXX in the future an option
to clone the reference first will be provided), while shallow copying will
return a shallow copy.
NOTE: The shallow copy method currently only handles blessed
{scalar,array,hash}ref as those are the most common.
=head2 uniq(@ary) => @uniq_ary
Try to use L<List::MoreUtils>'s C<uniq>, but fall back to using slower,
pure-Perl implementation.
=head1 HOMEPAGE
Please visit the project's homepage at L<https://metacpan.org/release/Function-Fallback-CoreOrPP>.
=head1 SOURCE
Source repository is at L<https://github.com/perlancar/perl-Function-Fallback-CoreOrPP>.
=head1 BUGS
Please report any bugs or feature requests on the bugtracker website L<https://rt.cpan.org/Public/Dist/Display.html?Name=Function-Fallback-CoreOrPP>
When submitting a bug or request, please include a test-file or a
patch to an existing test-file that illustrates the bug or desired
feature.
=head1 SEE ALSO
L<Clone::Any> can also use multiple backends. I used to avoid it because
L<Storable>'s C<dclone> (which is used as the backend) did not support Regexp
objects out of the box until version 3.08. Plus must use deparse to handle
coderefs.
=head1 AUTHOR
perlancar <perlancar@cpan.org>
=head1 COPYRIGHT AND LICENSE
This software is copyright (c) 2020, 2017, 2016, 2014 by perlancar@cpan.org.
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
|
