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package TAP::Parser::SourceHandler;
use strict;
use warnings;
use TAP::Parser::Iterator ();
use base 'TAP::Object';
=head1 NAME
TAP::Parser::SourceHandler - Base class for different TAP source handlers
=head1 VERSION
Version 3.42
=cut
our $VERSION = '3.42';
=head1 SYNOPSIS
# abstract class - don't use directly!
# see TAP::Parser::IteratorFactory for general usage
# must be sub-classed for use
package MySourceHandler;
use base 'TAP::Parser::SourceHandler';
sub can_handle { return $confidence_level }
sub make_iterator { return $iterator }
# see example below for more details
=head1 DESCRIPTION
This is an abstract base class for L<TAP::Parser::Source> handlers / handlers.
A C<TAP::Parser::SourceHandler> does whatever is necessary to produce & capture
a stream of TAP from the I<raw> source, and package it up in a
L<TAP::Parser::Iterator> for the parser to consume.
C<SourceHandlers> must implement the I<source detection & handling> interface
used by L<TAP::Parser::IteratorFactory>. At 2 methods, the interface is pretty
simple: L</can_handle> and L</make_source>.
Unless you're writing a new L<TAP::Parser::SourceHandler>, a plugin, or
subclassing L<TAP::Parser>, you probably won't need to use this module directly.
=head1 METHODS
=head2 Class Methods
=head3 C<can_handle>
I<Abstract method>.
my $vote = $class->can_handle( $source );
C<$source> is a L<TAP::Parser::Source>.
Returns a number between C<0> & C<1> reflecting how confidently the raw source
can be handled. For example, C<0> means the source cannot handle it, C<0.5>
means it may be able to, and C<1> means it definitely can. See
L<TAP::Parser::IteratorFactory/detect_source> for details on how this is used.
=cut
sub can_handle {
my ( $class, $args ) = @_;
$class->_croak(
"Abstract method 'can_handle' not implemented for $class!");
return;
}
=head3 C<make_iterator>
I<Abstract method>.
my $iterator = $class->make_iterator( $source );
C<$source> is a L<TAP::Parser::Source>.
Returns a new L<TAP::Parser::Iterator> object for use by the L<TAP::Parser>.
C<croak>s on error.
=cut
sub make_iterator {
my ( $class, $args ) = @_;
$class->_croak(
"Abstract method 'make_iterator' not implemented for $class!");
return;
}
1;
__END__
=head1 SUBCLASSING
Please see L<TAP::Parser/SUBCLASSING> for a subclassing overview, and any
of the subclasses that ship with this module as an example. What follows is
a quick overview.
Start by familiarizing yourself with L<TAP::Parser::Source> and
L<TAP::Parser::IteratorFactory>. L<TAP::Parser::SourceHandler::RawTAP> is
the easiest sub-class to use as an example.
It's important to point out that if you want your subclass to be automatically
used by L<TAP::Parser> you'll have to and make sure it gets loaded somehow.
If you're using L<prove> you can write an L<App::Prove> plugin. If you're
using L<TAP::Parser> or L<TAP::Harness> directly (e.g. through a custom script,
L<ExtUtils::MakeMaker>, or L<Module::Build>) you can use the C<config> option
which will cause L<TAP::Parser::IteratorFactory/load_sources> to load your
subclass).
Don't forget to register your class with
L<TAP::Parser::IteratorFactory/register_handler>.
=head2 Example
package MySourceHandler;
use strict;
use MySourceHandler; # see TAP::Parser::SourceHandler
use TAP::Parser::IteratorFactory;
use base 'TAP::Parser::SourceHandler';
TAP::Parser::IteratorFactory->register_handler( __PACKAGE__ );
sub can_handle {
my ( $class, $src ) = @_;
my $meta = $src->meta;
my $config = $src->config_for( $class );
if ($config->{accept_all}) {
return 1.0;
} elsif (my $file = $meta->{file}) {
return 0.0 unless $file->{exists};
return 1.0 if $file->{lc_ext} eq '.tap';
return 0.9 if $file->{shebang} && $file->{shebang} =~ /^#!.+tap/;
return 0.5 if $file->{text};
return 0.1 if $file->{binary};
} elsif ($meta->{scalar}) {
return 0.8 if $$raw_source_ref =~ /\d\.\.\d/;
return 0.6 if $meta->{has_newlines};
} elsif ($meta->{array}) {
return 0.8 if $meta->{size} < 5;
return 0.6 if $raw_source_ref->[0] =~ /foo/;
return 0.5;
} elsif ($meta->{hash}) {
return 0.6 if $raw_source_ref->{foo};
return 0.2;
}
return 0;
}
sub make_iterator {
my ($class, $source) = @_;
# this is where you manipulate the source and
# capture the stream of TAP in an iterator
# either pick a TAP::Parser::Iterator::* or write your own...
my $iterator = TAP::Parser::Iterator::Array->new([ 'foo', 'bar' ]);
return $iterator;
}
1;
=head1 AUTHORS
TAPx Developers.
Source detection stuff added by Steve Purkis
=head1 SEE ALSO
L<TAP::Object>,
L<TAP::Parser>,
L<TAP::Parser::Source>,
L<TAP::Parser::Iterator>,
L<TAP::Parser::IteratorFactory>,
L<TAP::Parser::SourceHandler::Executable>,
L<TAP::Parser::SourceHandler::Perl>,
L<TAP::Parser::SourceHandler::File>,
L<TAP::Parser::SourceHandler::Handle>,
L<TAP::Parser::SourceHandler::RawTAP>
=cut
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