File Coverage

blib/lib/Permute/Unnamed.pm

Criterion	Covered	Total	%
statement	30	32	93.7
branch	4	8	50.0
condition			n/a
subroutine	5	5	100.0
pod	1	1	100.0
total	40	46	86.9

package Permute::Unnamed;

use 5.010001;
use strict 'subs', 'vars';
use warnings;

use Exporter qw(import);

our $AUTHORITY = 'cpan:PERLANCAR'; # AUTHORITY
our $DATE = '2026-02-21'; # DATE
our $DIST = 'Permute-Unnamed'; # DIST
our $VERSION = '0.001'; # VERSION

our @EXPORT = qw(
                    permute_unnamed
            );

sub permute_unnamed {
    my @args = @_;
    die "Please supply a non-empty list of arrayrefs" unless @args;

    for my $i (0 .. $#args) {
        die "arg[$i] cannot contain empty values" unless @{ $args[$i] };
    }
    my @res;
    my $code = '{ my @j;';
    for my $i (0..$#args) {
        $code .= " local \$main::_j$i;";
    }
    for my $i (0..$#args) {
        $code .= " for \$main::_j$i (0..". $#{$args[$i]} . ") {";
    }
    $code .= " my \$ary = []; for my \$i (0..". $#args . ") { \$ary->[\$i] = \$args[\$i][ \${\"main::_j\$i\"} ]; } push \@res, \$ary;";
    for my $i (0..$#args) {
        $code .= ' }';
    }
    $code .= " }";
    #say $code;
    eval $code; if ($@) { warn "$code\n"; die } ## no critic: BuiltinFunctions::ProhibitStringyEval
    wantarray ? @res : \@res;
}

1;
# ABSTRACT: Permute multiple-valued lists

__END__