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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)