package TAP::Parser::Iterator;
use strict;
use vars qw($VERSION @ISA);
use TAP::Object ();
@ISA = qw(TAP::Object);
=head1 NAME
TAP::Parser::Iterator - Base class for TAP source iterators
=head1 VERSION
Version 3.28
=cut
$VERSION = '3.28';
=head1 SYNOPSIS
# to subclass:
use vars qw(@ISA);
use TAP::Parser::Iterator ();
@ISA = qw(TAP::Parser::Iterator);
sub _initialize {
# see TAP::Object...
}
sub next_raw { ... }
sub wait { ... }
sub exit { ... }
=head1 DESCRIPTION
This is a simple iterator base class that defines L<TAP::Parser>'s iterator
API. Iterators are typically created from L<TAP::Parser::SourceHandler>s.
=head1 METHODS
=head2 Class Methods
=head3 C<new>
Create an iterator. Provided by L<TAP::Object>.
=head2 Instance Methods
=head3 C<next>
while ( my $item = $iter->next ) { ... }
Iterate through it, of course.
=head3 C<next_raw>
B<Note:> this method is abstract and should be overridden.
while ( my $item = $iter->next_raw ) { ... }
Iterate raw input without applying any fixes for quirky input syntax.
=cut
sub next {
my $self = shift;
my $line = $self->next_raw;
# vms nit: When encountering 'not ok', vms often has the 'not' on a line
# by itself:
# not
# ok 1 - 'I hate VMS'
if ( defined($line) and $line =~ /^\s*not\s*$/ ) {
$line .= ( $self->next_raw || '' );
}
return $line;
}
sub next_raw {
require Carp;
my $msg = Carp::longmess('abstract method called directly!');
$_[0]->_croak($msg);
}
=head3 C<handle_unicode>
If necessary switch the input stream to handle unicode. This only has
any effect for I/O handle based streams.
The default implementation does nothing.
=cut
sub handle_unicode { }
=head3 C<get_select_handles>
Return a list of filehandles that may be used upstream in a select()
call to signal that this Iterator is ready. Iterators that are not
handle-based should return an empty list.
The default implementation does nothing.
=cut
sub get_select_handles {
return;
}
=head3 C<wait>
B<Note:> this method is abstract and should be overridden.
my $wait_status = $iter->wait;
Return the C<wait> status for this iterator.
=head3 C<exit>
B<Note:> this method is abstract and should be overridden.
my $wait_status = $iter->exit;
Return the C<exit> status for this iterator.
=cut
sub wait {
require Carp;
my $msg = Carp::longmess('abstract method called directly!');
$_[0]->_croak($msg);
}
sub exit {
require Carp;
my $msg = Carp::longmess('abstract method called directly!');
$_[0]->_croak($msg);
}
1;
=head1 SUBCLASSING
Please see L<TAP::Parser/SUBCLASSING> for a subclassing overview.
You must override the abstract methods as noted above.
=head2 Example
L<TAP::Parser::Iterator::Array> is probably the easiest example to follow.
There's not much point repeating it here.
=head1 SEE ALSO
L<TAP::Object>,
L<TAP::Parser>,
L<TAP::Parser::Iterator::Array>,
L<TAP::Parser::Iterator::Stream>,
L<TAP::Parser::Iterator::Process>,
=cut