File Coverage

blib/lib/HashDataRole/Source/Hash.pm

Criterion	Covered	Total	%
statement	43	52	82.6
branch	12	20	60.0
condition			n/a
subroutine	12	14	85.7
pod	0	11	0.0
total	67	97	69.0

package HashDataRole::Source::Hash;

our $AUTHORITY = 'cpan:PERLANCAR'; # AUTHORITY
our $DATE = '2021-05-21'; # DATE
our $DIST = 'HashDataRoles-Standard'; # DIST
our $VERSION = '0.001'; # VERSION

use 5.010001;
use Role::Tiny;
use Role::Tiny::With;
with 'HashDataRole::Spec::Basic';
with 'Role::TinyCommons::Collection::GetItemByPos'; # bonus

sub new {
    my ($class, %args) = @_;

    my $hash = delete $args{hash} or die "Please specify 'hash' argument";

    die "Unknown argument(s): ". join(", ", sort keys %args)
        if keys %args;

    # cache keys for iteration
    my $keys = [];
    for my $key (sort keys %$hash) {
        push @$keys, $key;
    }

    bless {
        hash => $hash,
        _keys => $keys,
        pos => 0,
    }, $class;
}

sub get_next_item {
    my $self = shift;
    die "StopIteration" unless $self->{pos} < @{ $self->{_keys} };
    my $key = $self->{_keys}->[ $self->{pos}++ ];
    [$key, $self->{hash}{$key}];
}

sub has_next_item {
    my $self = shift;
    $self->{pos} < @{ $self->{_keys} };
}

sub reset_iterator {
    my $self = shift;
    $self->{pos} = 0;
}

sub get_iterator_pos {
    my $self = shift;
    $self->{pos};
}

sub get_item_count {
    my $self = shift;
    scalar @{ $self->{_keys} };
}

sub get_item_at_pos {
    my ($self, $pos) = @_;
    if ($pos < 0) {
        die "Out of range" unless -$pos <= @{ $self->{_keys} };
    } else {
        die "Out of range" unless $pos < @{ $self->{_keys} };
    }
    my $key = $self->{_keys}->[$pos];
    [$key, $self->{hash}{$key}];
}

sub has_item_at_pos {
    my ($self, $pos) = @_;
    if ($pos < 0) {
        return -$pos <= @{ $self->{_keys} } ? 1:0;
    } else {
        return $pos < @{ $self->{_keys} } ? 1:0;
    }
}

sub get_item_at_key {
    my ($self, $key) = @_;
    die "No such key '$key'" unless exists $self->{hash}{$key};
    $self->{hash}{$key};
}

sub has_item_at_key {
    my ($self, $key) = @_;
    exists $self->{hash}{$key};
}

sub get_all_keys {
    my ($self, $key) = @_;
    @{$self->{_keys}};
}

1;
# ABSTRACT: Get hash data from a Perl hash

__END__