File Coverage

blib/lib/Sort/Sub/by_count.pm

Criterion	Covered	Total	%
statement	32	36	88.8
branch	8	18	44.4
condition	1	3	33.3
subroutine	7	8	87.5
pod	0	2	0.0
total	48	67	71.6

package Sort::Sub::by_count;

our $AUTHORITY = 'cpan:PERLANCAR'; # AUTHORITY
our $DATE = '2020-02-28'; # DATE
our $DIST = 'Sort-Sub'; # DIST
our $VERSION = '0.118'; # VERSION

use 5.010001;
use strict;
use warnings;

sub meta {
    return {
        v => 1,
        summary => 'Sort by number of occurrences of pattern in string',
    };
}

sub _pattern_to_re {
    my $args = shift;

    my $re;
    my $pattern = $args->{pattern}; defined $pattern or die "Please specify pattern";
    if ($args->{fixed_string}) {
        $re = $args->{ignore_case} ? qr/\Q$pattern/i : qr/\Q$pattern/;
    } else {
        eval { $re = $args->{ignore_case} ? qr/$pattern/i : qr/$pattern/ };
        die "Invalid pattern: $@" if $@;
    }

    $re;
}

sub gen_sorter {
    my ($is_reverse, $is_ci, $args) = @_;

    die __PACKAGE__.": Please specify 'pattern'" unless defined $args->{pattern};

    my $re = _pattern_to_re($args);

    sub {
        no strict 'refs';

        my $caller = caller();
        my $a = @_ ? $_[0] : ${"$caller\::a"};
        my $b = @_ ? $_[1] : ${"$caller\::b"};

        my $count_a = 0; $count_a++ while $a =~ /$re/g;
        my $count_b = 0; $count_b++ while $b =~ /$re/g;

        ($is_reverse ? -1 : 1)*(
            ($count_a <=> $count_b) ||
                ($is_ci ? lc($a) cmp lc($b) : $a cmp $b)
            );
    };
}

1;
# ABSTRACT: Sort by number of occurrences of pattern in string

__END__