1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
|
package TAP::Parser::SourceHandler;
use strict;
use vars qw($VERSION @ISA);
use TAP::Object ();
use TAP::Parser::Iterator ();
@ISA = qw(TAP::Object);
=head1 NAME
TAP::Parser::SourceHandler - Base class for different TAP source handlers
=head1 VERSION
Version 3.22
=cut
$VERSION = '3.22';
=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 qw( 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 an 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 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;
=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
|
