TAP::Parser::SourceHandler - Base class for different TAP source handlers
Version 3.42
# 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
This is an abstract base class for the TAP::Parser::Source manpage handlers / handlers.
A TAP::Parser::SourceHandler does whatever is necessary to produce & capture
a stream of TAP from the raw source, and package it up in a
the TAP::Parser::Iterator manpage for the parser to consume.
SourceHandlers must implement the source detection & handling interface
used by the TAP::Parser::IteratorFactory manpage. At 2 methods, the interface is pretty
simple: can_handle and make_source.
Unless you're writing a new the TAP::Parser::SourceHandler manpage, a plugin, or
subclassing the TAP::Parser manpage, you probably won't need to use this module directly.
Abstract method.
my $vote = $class->can_handle( $source );
$source is a the TAP::Parser::Source manpage.
Returns a number between 0 & 1 reflecting how confidently the raw source
can be handled. For example, 0 means the source cannot handle it, 0.5
means it may be able to, and 1 means it definitely can. See
detect_source in the TAP::Parser::IteratorFactory manpage for details on how this is used.
Abstract method.
my $iterator = $class->make_iterator( $source );
$source is a the TAP::Parser::Source manpage.
Returns a new the TAP::Parser::Iterator manpage object for use by the the TAP::Parser manpage.
croak s on error.
Please see SUBCLASSING in the TAP::Parser manpage 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 the TAP::Parser::Source manpage and
the TAP::Parser::IteratorFactory manpage. the TAP::Parser::SourceHandler::RawTAP manpage 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 the TAP::Parser manpage you'll have to and make sure it gets loaded somehow.
If you're using prove you can write an the App::Prove manpage plugin. If you're
using the TAP::Parser manpage or the TAP::Harness manpage directly (e.g. through a custom script,
the ExtUtils::MakeMaker manpage, or the Module::Build manpage) you can use the config option
which will cause load_sources in the TAP::Parser::IteratorFactory manpage to load your
subclass).
Don't forget to register your class with
register_handler in the TAP::Parser::IteratorFactory manpage.
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;
TAPx Developers.
Source detection stuff added by Steve Purkis
the TAP::Object manpage,
the TAP::Parser manpage,
the TAP::Parser::Source manpage,
the TAP::Parser::Iterator manpage,
the TAP::Parser::IteratorFactory manpage,
the TAP::Parser::SourceHandler::Executable manpage,
the TAP::Parser::SourceHandler::Perl manpage,
the TAP::Parser::SourceHandler::File manpage,
the TAP::Parser::SourceHandler::Handle manpage,
the TAP::Parser::SourceHandler::RawTAP manpage
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