This file is indexed.

/usr/share/perl5/Mojo/EventEmitter.pm is in libmojolicious-perl 6.15+dfsg-1ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  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
package Mojo::EventEmitter;
use Mojo::Base -base;

use Scalar::Util qw(blessed weaken);

use constant DEBUG => $ENV{MOJO_EVENTEMITTER_DEBUG} || 0;

sub catch { $_[0]->on(error => $_[1]) and return $_[0] }

sub emit {
  my ($self, $name) = (shift, shift);

  if (my $s = $self->{events}{$name}) {
    warn "-- Emit $name in @{[blessed $self]} (@{[scalar @$s]})\n" if DEBUG;
    for my $cb (@$s) { $self->$cb(@_) }
  }
  else {
    warn "-- Emit $name in @{[blessed $self]} (0)\n" if DEBUG;
    die "@{[blessed $self]}: $_[0]" if $name eq 'error';
  }

  return $self;
}

sub has_subscribers { !!shift->{events}{shift()} }

sub on { push @{$_[0]{events}{$_[1]}}, $_[2] and return $_[2] }

sub once {
  my ($self, $name, $cb) = @_;

  weaken $self;
  my $wrapper;
  $wrapper = sub {
    $self->unsubscribe($name => $wrapper);
    $cb->(@_);
  };
  $self->on($name => $wrapper);
  weaken $wrapper;

  return $wrapper;
}

sub subscribers { shift->{events}{shift()} ||= [] }

sub unsubscribe {
  my ($self, $name, $cb) = @_;

  # One
  if ($cb) {
    $self->{events}{$name} = [grep { $cb ne $_ } @{$self->{events}{$name}}];
    delete $self->{events}{$name} unless @{$self->{events}{$name}};
  }

  # All
  else { delete $self->{events}{$name} }

  return $self;
}

1;

=encoding utf8

=head1 NAME

Mojo::EventEmitter - Event emitter base class

=head1 SYNOPSIS

  package Cat;
  use Mojo::Base 'Mojo::EventEmitter';

  # Emit events
  sub poke {
    my $self = shift;
    $self->emit(roar => 3);
  }

  package main;

  # Subscribe to events
  my $tiger = Cat->new;
  $tiger->on(roar => sub {
    my ($tiger, $times) = @_;
    say 'RAWR!' for 1 .. $times;
  });
  $tiger->poke;

=head1 DESCRIPTION

L<Mojo::EventEmitter> is a simple base class for event emitting objects.

=head1 EVENTS

L<Mojo::EventEmitter> can emit the following events.

=head2 error

  $e->on(error => sub {
    my ($e, $err) = @_;
    ...
  });

This is a special event for errors, it will not be emitted directly by this
class but is fatal if unhandled.

  $e->on(error => sub {
    my ($e, $err) = @_;
    say "This looks bad: $err";
  });

=head1 METHODS

L<Mojo::EventEmitter> inherits all methods from L<Mojo::Base> and implements
the following new ones.

=head2 catch

  $e = $e->catch(sub {...});

Subscribe to L</"error"> event.

  # Longer version
  $e->on(error => sub {...});

=head2 emit

  $e = $e->emit('foo');
  $e = $e->emit('foo', 123);

Emit event.

=head2 has_subscribers

  my $bool = $e->has_subscribers('foo');

Check if event has subscribers.

=head2 on

  my $cb = $e->on(foo => sub {...});

Subscribe to event.

  $e->on(foo => sub {
    my ($e, @args) = @_;
    ...
  });

=head2 once

  my $cb = $e->once(foo => sub {...});

Subscribe to event and unsubscribe again after it has been emitted once.

  $e->once(foo => sub {
    my ($e, @args) = @_;
    ...
  });

=head2 subscribers

  my $subscribers = $e->subscribers('foo');

All subscribers for event.

  # Unsubscribe last subscriber
  $e->unsubscribe(foo => $e->subscribers('foo')->[-1]);

  # Change order of subscribers
  @{$e->subscribers('foo')} = reverse @{$e->subscribers('foo')};

=head2 unsubscribe

  $e = $e->unsubscribe('foo');
  $e = $e->unsubscribe(foo => $cb);

Unsubscribe from event.

=head1 DEBUGGING

You can set the C<MOJO_EVENTEMITTER_DEBUG> environment variable to get some
advanced diagnostics information printed to C<STDERR>.

  MOJO_EVENTEMITTER_DEBUG=1

=head1 SEE ALSO

L<Mojolicious>, L<Mojolicious::Guides>, L<http://mojolicio.us>.

=cut