/usr/share/perl5/Attean/CodeIterator.pm is in libattean-perl 0.017-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 | use v5.14;
use warnings;
=head1 NAME
Attean::CodeIterator - Iterator implementation backed by a generator function
=head1 VERSION
This document describes Attean::CodeIterator version 0.017
=head1 SYNOPSIS
use v5.14;
use Attean;
my $iter = Attean::CodeIterator->new(
generator => sub {
state $value = 0;
Attean::Literal->new(++$value)
},
item_type => 'Attean::API::Term',
);
say $iter->next->value; # 1
say $iter->next->value; # 2
say $iter->next->value; # 3
=head1 DESCRIPTION
The Attean::CodeIterator class represents a typed iterator.
It conforms to the L<Attean::API::Iterator> role.
The Attean::CodeIterator constructor requires two named arguments:
=over 4
=item generator
A code reference that when called will return either the iterator's next item,
or undef upon reaching the end of iteration.
=item item_type
A L<Type::Tiny> object representing the type of the items
that will be returned from the iterator.
=back
=head1 METHODS
=over 4
=cut
package Attean::CodeIterator 0.017 {
use Moo;
use Type::Tiny::Role;
use Scalar::Util qw(blessed);
use Types::Standard qw(CodeRef ArrayRef);
use namespace::clean;
with 'Attean::API::Iterator';
has generator => (is => 'ro', isa => CodeRef, required => 1);
has _buffer => (is => 'ro', isa => ArrayRef, init_arg => undef, default => sub { [] });
=item C<< next >>
Returns the iterator's next item, or undef upon reaching the end of iteration.
=cut
sub next {
my $self = shift;
my $buffer = $self->_buffer;
if (scalar(@$buffer)) {
return shift(@$buffer);
}
my @items = $self->generator->();
my $item = shift(@items);
return unless defined($item);
if (scalar(@items)) {
push(@$buffer, @items);
}
my $role = $self->item_type;
if (Role::Tiny->is_role($role)) {
die "CodeIterator item is not a $role: $item" unless (blessed($item) and $item->does($role));
}
return $item;
}
}
1;
__END__
=back
=head1 BUGS
Please report any bugs or feature requests to through the GitHub web interface
at L<https://github.com/kasei/attean/issues>.
=head1 SEE ALSO
L<http://www.perlrdf.org/>
=head1 AUTHOR
Gregory Todd Williams C<< <gwilliams@cpan.org> >>
=head1 COPYRIGHT
Copyright (c) 2014--2016 Gregory Todd Williams.
This program is free software; you can redistribute it and/or modify it under
the same terms as Perl itself.
=cut
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