/usr/share/perl5/Mojo/Base.pm is in libmojolicious-perl 7.21+dfsg-1.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 | package Mojo::Base;
use strict;
use warnings;
use utf8;
use feature ();
# No imports because we get subclassed, a lot!
use Carp ();
# Only Perl 5.14+ requires it on demand
use IO::Handle ();
# Supported on Perl 5.22+
my $NAME
= eval { require Sub::Util; Sub::Util->can('set_subname') } || sub { $_[1] };
# Protect subclasses using AUTOLOAD
sub DESTROY { }
# Declared here to avoid circular require problems in Mojo::Util
sub _monkey_patch {
my ($class, %patch) = @_;
no strict 'refs';
no warnings 'redefine';
*{"${class}::$_"} = $NAME->("${class}::$_", $patch{$_}) for keys %patch;
}
sub attr {
my ($self, $attrs, $value) = @_;
return unless (my $class = ref $self || $self) && $attrs;
Carp::croak 'Default has to be a code reference or constant value'
if ref $value && ref $value ne 'CODE';
for my $attr (@{ref $attrs eq 'ARRAY' ? $attrs : [$attrs]}) {
Carp::croak qq{Attribute "$attr" invalid} unless $attr =~ /^[a-zA-Z_]\w*$/;
# Very performance-sensitive code with lots of micro-optimizations
if (ref $value) {
_monkey_patch $class, $attr, sub {
return
exists $_[0]{$attr} ? $_[0]{$attr} : ($_[0]{$attr} = $value->($_[0]))
if @_ == 1;
$_[0]{$attr} = $_[1];
$_[0];
};
}
elsif (defined $value) {
_monkey_patch $class, $attr, sub {
return exists $_[0]{$attr} ? $_[0]{$attr} : ($_[0]{$attr} = $value)
if @_ == 1;
$_[0]{$attr} = $_[1];
$_[0];
};
}
else {
_monkey_patch $class, $attr,
sub { return $_[0]{$attr} if @_ == 1; $_[0]{$attr} = $_[1]; $_[0] };
}
}
}
sub import {
my $class = shift;
return unless my $flag = shift;
# Base
if ($flag eq '-base') { $flag = $class }
# Strict
elsif ($flag eq '-strict') { $flag = undef }
# Module
elsif ((my $file = $flag) && !$flag->can('new')) {
$file =~ s!::|'!/!g;
require "$file.pm";
}
# ISA
if ($flag) {
my $caller = caller;
no strict 'refs';
push @{"${caller}::ISA"}, $flag;
_monkey_patch $caller, 'has', sub { attr($caller, @_) };
}
# Mojo modules are strict!
$_->import for qw(strict warnings utf8);
feature->import(':5.10');
}
sub new {
my $class = shift;
bless @_ ? @_ > 1 ? {@_} : {%{$_[0]}} : {}, ref $class || $class;
}
sub tap {
my ($self, $cb) = (shift, shift);
$_->$cb(@_) for $self;
return $self;
}
1;
=encoding utf8
=head1 NAME
Mojo::Base - Minimal base class for Mojo projects
=head1 SYNOPSIS
package Cat;
use Mojo::Base -base;
has name => 'Nyan';
has ['age', 'weight'] => 4;
package Tiger;
use Mojo::Base 'Cat';
has friend => sub { Cat->new };
has stripes => 42;
package main;
use Mojo::Base -strict;
my $mew = Cat->new(name => 'Longcat');
say $mew->age;
say $mew->age(3)->weight(5)->age;
my $rawr = Tiger->new(stripes => 38, weight => 250);
say $rawr->tap(sub { $_->friend->name('Tacgnol') })->weight;
=head1 DESCRIPTION
L<Mojo::Base> is a simple base class for L<Mojo> projects with fluent
interfaces.
# Automatically enables "strict", "warnings", "utf8" and Perl 5.10 features
use Mojo::Base -strict;
use Mojo::Base -base;
use Mojo::Base 'SomeBaseClass';
All three forms save a lot of typing.
# use Mojo::Base -strict;
use strict;
use warnings;
use utf8;
use feature ':5.10';
use IO::Handle ();
# use Mojo::Base -base;
use strict;
use warnings;
use utf8;
use feature ':5.10';
use IO::Handle ();
use Mojo::Base;
push @ISA, 'Mojo::Base';
sub has { Mojo::Base::attr(__PACKAGE__, @_) }
# use Mojo::Base 'SomeBaseClass';
use strict;
use warnings;
use utf8;
use feature ':5.10';
use IO::Handle ();
require SomeBaseClass;
push @ISA, 'SomeBaseClass';
use Mojo::Base;
sub has { Mojo::Base::attr(__PACKAGE__, @_) }
=head1 FUNCTIONS
L<Mojo::Base> implements the following functions, which can be imported with
the C<-base> flag or by setting a base class.
=head2 has
has 'name';
has ['name1', 'name2', 'name3'];
has name => 'foo';
has name => sub {...};
has ['name1', 'name2', 'name3'] => 'foo';
has ['name1', 'name2', 'name3'] => sub {...};
Create attributes for hash-based objects, just like the L</"attr"> method.
=head1 METHODS
L<Mojo::Base> implements the following methods.
=head2 attr
$object->attr('name');
SubClass->attr('name');
SubClass->attr(['name1', 'name2', 'name3']);
SubClass->attr(name => 'foo');
SubClass->attr(name => sub {...});
SubClass->attr(['name1', 'name2', 'name3'] => 'foo');
SubClass->attr(['name1', 'name2', 'name3'] => sub {...});
Create attribute accessors for hash-based objects, an array reference can be
used to create more than one at a time. Pass an optional second argument to set
a default value, it should be a constant or a callback. The callback will be
executed at accessor read time if there's no set value, and gets passed the
current instance of the object as first argument. Accessors can be chained, that
means they return their invocant when they are called with an argument.
=head2 new
my $object = SubClass->new;
my $object = SubClass->new(name => 'value');
my $object = SubClass->new({name => 'value'});
This base class provides a basic constructor for hash-based objects. You can
pass it either a hash or a hash reference with attribute values.
=head2 tap
$object = $object->tap(sub {...});
$object = $object->tap('some_method');
$object = $object->tap('some_method', @args);
Tap into a method chain to perform operations on an object within the chain
(also known as a K combinator or Kestrel). The object will be the first argument
passed to the callback, and is also available as C<$_>. The callback's return
value will be ignored; instead, the object (the callback's first argument) will
be the return value. In this way, arbitrary code can be used within (i.e.,
spliced or tapped into) a chained set of object method calls.
# Longer version
$object = $object->tap(sub { $_->some_method(@args) });
# Inject side effects into a method chain
$object->foo('A')->tap(sub { say $_->foo })->foo('B');
=head1 SEE ALSO
L<Mojolicious>, L<Mojolicious::Guides>, L<http://mojolicious.org>.
=cut
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