TAP::Parser::SourceHandler(3pm) 			 Perl Programmers Reference Guide			   TAP::Parser::SourceHandler(3pm)

NAME

       TAP::Parser::SourceHandler - Base class for different TAP source handlers

VERSION

       Version 3.23

SYNOPSIS

	 # abstract class - don't use directly!
	 # see TAP::Parser::IteratorFactory for general usage

	 # must be sub-classed for use
	 package MySourceHandler;
	 use base qw( TAP::Parser::SourceHandler );
	 sub can_handle    { return $confidence_level }
	 sub make_iterator { return $iterator }

	 # see example below for more details

DESCRIPTION

       This is an abstract base class for TAP::Parser::Source 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
       TAP::Parser::Iterator for the parser to consume.

       "SourceHandlers" must implement the source detection & handling interface used by TAP::Parser::IteratorFactory.	At 2 methods, the
       interface is pretty simple: "can_handle" and "make_source".

       Unless you're writing a new TAP::Parser::SourceHandler, a plugin, or subclassing TAP::Parser, you probably won't need to use this module
       directly.

METHODS

   Class Methods
       "can_handle"

       Abstract method.

	 my $vote = $class->can_handle( $source );

       $source is a TAP::Parser::Source.

       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 TAP::Parser::IteratorFactory for details on how this is
       used.

       "make_iterator"

       Abstract method.

	 my $iterator = $class->make_iterator( $source );

       $source is a TAP::Parser::Source.

       Returns a new TAP::Parser::Iterator object for use by the TAP::Parser.  "croak"s on error.

SUBCLASSING

       Please see "SUBCLASSING" in TAP::Parser 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 TAP::Parser::Source and TAP::Parser::IteratorFactory.  TAP::Parser::SourceHandler::RawTAP is the
       easiest sub-class to use an an example.

       It's important to point out that if you want your subclass to be automatically used by TAP::Parser you'll have to and make sure it gets
       loaded somehow.	If you're using prove you can write an App::Prove plugin.  If you're using TAP::Parser or TAP::Harness directly (e.g.
       through a custom script, ExtUtils::MakeMaker, or Module::Build) you can use the "config" option which will cause "load_sources" in
       TAP::Parser::IteratorFactory to load your subclass).

       Don't forget to register your class with "register_handler" in TAP::Parser::IteratorFactory.

   Example
	 package MySourceHandler;

	 use strict;
	 use vars '@ISA'; # compat with older perls

	 use MySourceHandler; # see TAP::Parser::SourceHandler
	 use TAP::Parser::IteratorFactory;

	 @ISA = qw( 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;

AUTHORS

       TAPx Developers.

       Source detection stuff added by Steve Purkis

SEE ALSO

       TAP::Object, TAP::Parser, TAP::Parser::Source, TAP::Parser::Iterator, TAP::Parser::IteratorFactory, TAP::Parser::SourceHandler::Executable,
       TAP::Parser::SourceHandler::Perl, TAP::Parser::SourceHandler::File, TAP::Parser::SourceHandler::Handle, TAP::Parser::SourceHandler::RawTAP

perl v5.16.2							    2012-10-25					   TAP::Parser::SourceHandler(3pm)