File Coverage

blib/lib/Sort/Sub/by_perl_code.pm

Criterion	Covered	Total	%
statement	41	44	93.1
branch	8	12	66.6
condition			n/a
subroutine	12	13	92.3
pod	0	2	0.0
total	61	71	85.9

package Sort::Sub::by_perl_code;

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

use 5.010;
use strict;
use warnings;

sub meta {
    return {
        v => 1,
        summary => 'Sort by Perl code',
        args => {
            code => {
                summary => 'Either compiled code or string code excluding the "sub {" and "}" enclosure',
                description => <<'_',

Code should accept two arguments (the operands to be compared) and is expected
to return -1, 0, -1 like the builtin `cmp` operator.

_
                schema => 'str*',
                req => 1,
            },
        },
    };
}
sub gen_sorter {
    my ($is_reverse, $is_ci, $args) = @_;

    my $code = $args->{code};
    die "Please supply sorter argument 'code'"
        unless defined $code;

    if (ref $code ne 'CODE') {
        $code = eval "no strict; no warnings; sub { $code }";
        die "Can't compile $code: $@" if $@;
    }

    sub {
        no strict 'refs';

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

        my $cmp = $code->($a, $b);
        $is_reverse ? -1*$cmp : $cmp;
    };
}

1;
# ABSTRACT: Sort by Perl code

__END__