File Coverage

blib/lib/ArrayDataRole/Source/LinesInFile.pm

Criterion	Covered	Total	%
statement	38	42	90.4
branch	17	18	94.4
condition			n/a
subroutine	9	11	81.8
pod	2	8	25.0
total	66	79	83.5

package ArrayDataRole::Source::LinesInFile;

use strict;
use Role::Tiny;
use Role::Tiny::With;
with 'ArrayDataRole::Spec::Basic';

our $AUTHORITY = 'cpan:PERLANCAR'; # AUTHORITY
our $DATE = '2021-12-01'; # DATE
our $DIST = 'ArrayDataRoles-Standard'; # DIST
our $VERSION = '0.007'; # VERSION

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

    my $fh;
    unless (defined($fh = delete $args{fh})) {
        my $filename = delete $args{filename};
        defined $filename or die "Please specify fh or filename";
        open  $fh, "<", $filename;
    }

    bless {
        fh => $fh,
        pos => 0, # iterator
    }, $class;
}

sub get_next_item {
    my $self = shift;
    die "StopIteration" if eof($self->{fh});
    chomp(my $elem = readline($self->{fh}));
    $self->{pos}++;
    $elem;
}

sub has_next_item {
    my $self = shift;
    !eof($self->{fh});
}

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

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

sub get_item_at_pos {
    my ($self, $pos) = @_;
    $self->reset_iterator if $self->{pos} > $pos;
    while (1) {
        die "Out of range" unless $self->has_next_item;
        my $item = $self->get_next_item;
        return $item if $self->{pos} > $pos;
    }
}

sub has_item_at_pos {
    my ($self, $pos) = @_;
    return 1 if $self->{pos} > $pos;
    while (1) {
        return 0 unless $self->has_next_item;
        $self->get_next_item;
        return 1 if $self->{pos} > $pos;
    }
}

sub fh {
    my $self = shift;
    $self->{fh};
}

1;
# ABSTRACT: Role to access array data from a file/filehandle, one line per element

__END__