/usr/share/perl5/perl5i/2/HASH.pm is in libperl5i-perl 2.12.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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package perl5i::2::HASH;
use 5.010;
use strict;
use warnings;
# Don't accidentally turn carp/croak into methods.
require Carp::Fix::1_25;
require Hash::StoredIterator;
use perl5i::2::Signatures;
method each($callback) {
return Hash::StoredIterator::eech( $callback, $self );
}
sub flip {
Carp::Fix::1_25::croak("Can't flip hash with references as values")
if grep { ref } values %{$_[0]};
my %flipped = reverse %{$_[0]};
return wantarray ? %flipped : \%flipped;
}
sub merge {
require Hash::Merge::Simple;
my $merged = Hash::Merge::Simple::merge(@_);
return wantarray ? %$merged : $merged;
}
sub print {
my $hash = shift;
print join(" ", map { "$_ => $hash->{$_}" } keys %$hash);
}
sub say {
my $hash = shift;
print join(" ", map { "$_ => $hash->{$_}" } keys %$hash), "\n";
}
my $common = sub {
# Return all things in first array that are also present in second.
my ($c, $d) = @_;
no warnings 'uninitialized';
my %seen = map { $_ => 1 } @$d;
my @common = grep { $seen{$_} } @$c;
return \@common;
};
sub diff {
my ($base, @rest) = @_;
unless (@rest) {
return wantarray ? %$base : $base;
}
die "Arguments must be hash references" if grep { ref $_ ne 'HASH' } @rest;
# make a copy so that we can delete kv pairs without modifying the
# original hashref.
my %base = %$base;
require perl5i::2::equal;
foreach my $hash (@rest) {
my $common_keys = $common->( [ keys %$base ], [ keys %$hash ] );
next unless @$common_keys;
# Keys are equal, are values also equal?
foreach my $key (@$common_keys) {
delete $base{$key} if perl5i::2::equal::are_equal( $base->{$key}, $hash->{$key} );
}
}
return wantarray ? %base : \%base;
}
my $different = sub {
# Return all things in first array that are not present in second.
my ($c, $d) = @_;
no warnings 'uninitialized';
my %seen = map { $_ => 1 } @$d;
my @different = grep { not $seen{$_} } @$c;
return \@different;
};
sub intersect {
my ($base, @rest) = @_;
unless (@rest) {
return wantarray ? %$base : $base;
}
die "Arguments must be hash references" if grep { ref $_ ne 'HASH' } @rest;
# make a copy so that we can delete kv pairs without modifying the
# original hashref.
my %base = %$base;
require perl5i::2::equal;
foreach my $hash (@rest) {
my $different_keys = $different->( [ keys %$base ], [ keys %$hash ] );
delete @base{@$different_keys};
return wantarray ? () : {} unless %base;
my $common_keys = $common->( [ keys %$base ], [ keys %$hash ] );
# Keys are equal, are values also equal?
foreach my $key (@$common_keys) {
delete $base{$key} unless perl5i::2::equal::are_equal( $base->{$key}, $hash->{$key} );
}
}
return wantarray ? %base : \%base;
}
1;
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