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[perl5.git] / t / op / universal.t
CommitLineData
44a8e56a
PP
1#!./perl
2#
3# check UNIVERSAL
4#
5
e09f3e01
G
6BEGIN {
7 chdir 't' if -d 't';
20822f61 8 @INC = '../lib';
46e4b22b 9 $| = 1;
3e44d7c6 10 require "./test.pl";
e09f3e01
G
11}
12
cee59a6a 13plan tests => 135;
44a8e56a
PP
14
15$a = {};
16bless $a, "Bob";
3e44d7c6 17ok $a->isa("Bob");
44a8e56a 18
ff0cee69
PP
19package Human;
20sub eat {}
44a8e56a 21
ff0cee69
PP
22package Female;
23@ISA=qw(Human);
44a8e56a 24
ff0cee69
PP
25package Alice;
26@ISA=qw(Bob Female);
39d11b7f
TB
27sub sing;
28sub drink { return "drinking " . $_[1] }
ff0cee69 29sub new { bless {} }
44a8e56a 30
e09f3e01
G
31$Alice::VERSION = 2.718;
32
46e4b22b
GS
33{
34 package Cedric;
35 our @ISA;
36 use base qw(Human);
37}
38
39{
40 package Programmer;
41 our $VERSION = 1.667;
42
43 sub write_perl { 1 }
44}
45
44a8e56a 46package main;
e09f3e01 47
3e44d7c6 48
e09f3e01 49
ff0cee69 50$a = new Alice;
44a8e56a 51
3e44d7c6
MS
52ok $a->isa("Alice");
53ok $a->isa("main::Alice"); # check that alternate class names work
44a8e56a 54
3e44d7c6 55ok(("main::Alice"->new)->isa("Alice"));
178d71da 56
3e44d7c6
MS
57ok $a->isa("Bob");
58ok $a->isa("main::Bob");
e09f3e01 59
3e44d7c6 60ok $a->isa("Female");
e09f3e01 61
072cb3f5
BF
62ok ! $a->isa("Female\0NOT REALLY!"), "->isa is nul-clean.";
63
3e44d7c6 64ok $a->isa("Human");
e09f3e01 65
3e44d7c6 66ok ! $a->isa("Male");
e09f3e01 67
3e44d7c6 68ok ! $a->isa('Programmer');
46e4b22b 69
3e44d7c6 70ok $a->isa("HASH");
986114cf 71
3e44d7c6 72ok $a->can("eat");
072cb3f5 73ok ! $a->can("eat\0Except not!"), "->can is nul-clean.";
3e44d7c6
MS
74ok ! $a->can("sleep");
75ok my $ref = $a->can("drink"); # returns a coderef
76is $a->$ref("tea"), "drinking tea"; # ... which works
77ok $ref = $a->can("sing");
444e39b5 78eval { $a->$ref() };
3e44d7c6 79ok $@; # ... but not if no actual subroutine
e09f3e01 80
3e44d7c6 81ok (!Cedric->isa('Programmer'));
46e4b22b 82
3e44d7c6 83ok (Cedric->isa('Human'));
46e4b22b
GS
84
85push(@Cedric::ISA,'Programmer');
86
3e44d7c6 87ok (Cedric->isa('Programmer'));
46e4b22b
GS
88
89{
90 package Alice;
91 base::->import('Programmer');
92}
93
3e44d7c6
MS
94ok $a->isa('Programmer');
95ok $a->isa("Female");
46e4b22b
GS
96
97@Cedric::ISA = qw(Bob);
98
3e44d7c6 99ok (!Cedric->isa('Programmer'));
46e4b22b 100
e09f3e01
G
101my $b = 'abc';
102my @refs = qw(SCALAR SCALAR LVALUE GLOB ARRAY HASH CODE);
103my @vals = ( \$b, \3.14, \substr($b,1,1), \*b, [], {}, sub {} );
104for ($p=0; $p < @refs; $p++) {
105 for ($q=0; $q < @vals; $q++) {
3e44d7c6 106 is UNIVERSAL::isa($vals[$p], $refs[$q]), ($p==$q or $p+$q==1);
e09f3e01
G
107 };
108};
109
3e44d7c6 110ok ! UNIVERSAL::can(23, "can");
cee59a6a
FC
111++${"23::foo"};
112ok UNIVERSAL::can("23", "can"), '"23" can can when the pack exists';
113ok UNIVERSAL::can(23, "can"), '23 can can when the pack exists';
e09f3e01 114
3e44d7c6 115ok $a->can("VERSION");
e09f3e01 116
3e44d7c6
MS
117ok $a->can("can");
118ok ! $a->can("export_tags"); # a method in Exporter
e09f3e01 119
3e44d7c6 120cmp_ok eval { $a->VERSION }, '==', 2.718;
e09f3e01 121
3e44d7c6 122ok ! (eval { $a->VERSION(2.719) });
ac0e6a2f 123like $@, qr/^Alice version 2.719 required--this is only version 2.718 at /;
44a8e56a 124
3e44d7c6
MS
125ok (eval { $a->VERSION(2.718) });
126is $@, '';
ff0cee69 127
c2a3bbbf
FC
128ok ! (eval { $a->VERSION("version") });
129like $@, qr/^Invalid version format/;
130
131$aversion::VERSION = "version";
132ok ! (eval { aversion->VERSION(2.719) });
133like $@, qr/^Invalid version format/;
134
e09f3e01 135my $subs = join ' ', sort grep { defined &{"UNIVERSAL::$_"} } keys %UNIVERSAL::;
ea8fae29
BS
136## The test for import here is *not* because we want to ensure that UNIVERSAL
137## can always import; it is an historical accident that UNIVERSAL can import.
9d116dd7 138if ('a' lt 'A') {
4bf88892 139 is $subs, "can import isa DOES VERSION";
9d116dd7 140} else {
4bf88892 141 is $subs, "DOES VERSION can import isa";
9d116dd7 142}
ff0cee69 143
3e44d7c6 144ok $a->isa("UNIVERSAL");
ff0cee69 145
3e44d7c6 146ok ! UNIVERSAL::isa([], "UNIVERSAL");
b4c2bf25 147
3e44d7c6 148ok ! UNIVERSAL::can({}, "can");
b4c2bf25 149
3e44d7c6 150ok UNIVERSAL::isa(Alice => "UNIVERSAL");
b4c2bf25 151
3e44d7c6 152cmp_ok UNIVERSAL::can(Alice => "can"), '==', \&UNIVERSAL::can;
b4c2bf25 153
84902520 154# now use UNIVERSAL.pm and see what changes
e09f3e01 155eval "use UNIVERSAL";
ff0cee69 156
3e44d7c6 157ok $a->isa("UNIVERSAL");
44a8e56a 158
46e4b22b 159my $sub2 = join ' ', sort grep { defined &{"UNIVERSAL::$_"} } keys %UNIVERSAL::;
84902520 160# XXX import being here is really a bug
9d116dd7 161if ('a' lt 'A') {
4bf88892 162 is $sub2, "can import isa DOES VERSION";
9d116dd7 163} else {
4bf88892 164 is $sub2, "DOES VERSION can import isa";
9d116dd7 165}
44a8e56a 166
e09f3e01 167eval 'sub UNIVERSAL::sleep {}';
3e44d7c6 168ok $a->can("sleep");
44a8e56a 169
3e44d7c6 170ok ! UNIVERSAL::can($b, "can");
84902520 171
3e44d7c6 172ok ! $a->can("export_tags"); # a method in Exporter
83f7a2bc 173
3e44d7c6 174ok ! UNIVERSAL::isa("\xff\xff\xff\0", 'HASH');
ea8fae29
BS
175
176{
177 package Pickup;
178 use UNIVERSAL qw( isa can VERSION );
179
3e44d7c6
MS
180 ::ok isa "Pickup", UNIVERSAL;
181 ::cmp_ok can( "Pickup", "can" ), '==', \&UNIVERSAL::can;
182 ::ok VERSION "UNIVERSAL" ;
ea8fae29 183}
253ecd6d
RGS
184
185{
186 # test isa() and can() on magic variables
187 "Human" =~ /(.*)/;
3e44d7c6
MS
188 ok $1->isa("Human");
189 ok $1->can("eat");
253ecd6d
RGS
190 package HumanTie;
191 sub TIESCALAR { bless {} }
192 sub FETCH { "Human" }
193 tie my($x), "HumanTie";
3e44d7c6
MS
194 ::ok $x->isa("Human");
195 ::ok $x->can("eat");
253ecd6d 196}
a1d407e8
DM
197
198# bugid 3284
199# a second call to isa('UNIVERSAL') when @ISA is null failed due to caching
200
201@X::ISA=();
202my $x = {}; bless $x, 'X';
3e44d7c6
MS
203ok $x->isa('UNIVERSAL');
204ok $x->isa('UNIVERSAL');
2bfd5681
MS
205
206
207# Check that the "historical accident" of UNIVERSAL having an import()
208# method doesn't effect anyone else.
209eval { Some::Package->import("bar") };
3e44d7c6
MS
210is $@, '';
211
212
213# This segfaulted in a blead.
214fresh_perl_is('package Foo; Foo->VERSION; print "ok"', 'ok');
215
1f656fcf
FC
216# So did this.
217fresh_perl_is('$:; UNIVERSAL::isa(":","Unicode::String");print "ok"','ok');
218
cbc021f9 219package Foo;
220
4bf88892 221sub DOES { 1 }
cbc021f9 222
223package Bar;
224
225@Bar::ISA = 'Foo';
226
227package Baz;
228
229package main;
4bf88892
RGS
230ok( Foo->DOES( 'bar' ), 'DOES() should call DOES() on class' );
231ok( Bar->DOES( 'Bar' ), '... and should fall back to isa()' );
232ok( Bar->DOES( 'Foo' ), '... even when inherited' );
233ok( Baz->DOES( 'Baz' ), '... even without inheriting any other DOES()' );
234ok( ! Baz->DOES( 'Foo' ), '... returning true or false appropriately' );
ae6d515f 235
072cb3f5
BF
236ok( ! "T"->DOES( "T\0" ), 'DOES() is nul-clean' );
237ok( ! Baz->DOES( "Baz\0Boy howdy" ), 'DOES() is nul-clean' );
238
ae6d515f
RGS
239package Pig;
240package Bodine;
241Bodine->isa('Pig');
242*isa = \&UNIVERSAL::isa;
243eval { isa({}, 'HASH') };
59e7186f
RGS
244::is($@, '', "*isa correctly found");
245
246package main;
247eval { UNIVERSAL::DOES([], "foo") };
248like( $@, qr/Can't call method "DOES" on unblessed reference/,
249 'DOES call error message says DOES, not isa' );
b91ba1f2
NC
250
251# Tests for can seem to be split between here and method.t
252# Add the verbatim perl code mentioned in the comments of
253# http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/2001-05/msg01710.html
254# but never actually tested.
255is(UNIVERSAL->can("NoSuchPackage::foo"), undef);
5782d502
NC
256
257@splatt::ISA = 'zlopp';
258ok (splatt->isa('zlopp'));
259ok (!splatt->isa('plop'));
260
261# This should reset the ->isa lookup cache
262@splatt::ISA = 'plop';
263# And here is the new truth.
264ok (!splatt->isa('zlopp'));
265ok (splatt->isa('plop'));
266
cd477a63
RGS
267use warnings "deprecated";
268{
269 my $m;
270 local $SIG{__WARN__} = sub { $m = $_[0] };
252143cd 271 eval "use UNIVERSAL 'can'";
cd477a63 272 like($m, qr/^UNIVERSAL->import is deprecated/,
252143cd
RS
273 "deprecation warning for UNIVERSAL->import('can')");
274
275 undef $m;
276 eval "use UNIVERSAL";
277 is($m, undef,
278 "no deprecation warning for UNIVERSAL->import");
cd477a63 279}
27889255
B
280
281# Test: [perl #66112]: change @ISA inside sub isa
282{
283 package RT66112::A;
284
285 package RT66112::B;
286
287 sub isa {
288 my $self = shift;
289 @ISA = qw/RT66112::A/;
290 return $self->SUPER::isa(@_);
291 }
292
293 package RT66112::C;
294
295 package RT66112::D;
296
297 sub isa {
298 my $self = shift;
299 @RT66112::E::ISA = qw/RT66112::A/;
300 return $self->SUPER::isa(@_);
301 }
302
303 package RT66112::E;
304
305 package main;
306
307 @RT66112::B::ISA = qw//;
308 @RT66112::C::ISA = qw/RT66112::B/;
309 @RT66112::T1::ISA = qw/RT66112::C/;
310 ok(RT66112::T1->isa('RT66112::C'), "modify \@ISA in isa (RT66112::T1 isa RT66112::C)");
311
312 @RT66112::B::ISA = qw//;
313 @RT66112::C::ISA = qw/RT66112::B/;
314 @RT66112::T2::ISA = qw/RT66112::C/;
315 ok(RT66112::T2->isa('RT66112::B'), "modify \@ISA in isa (RT66112::T2 isa RT66112::B)");
316
317 @RT66112::B::ISA = qw//;
318 @RT66112::C::ISA = qw/RT66112::B/;
319 @RT66112::T3::ISA = qw/RT66112::C/;
80ebaca2 320 ok(RT66112::T3->isa('RT66112::A'), "modify \@ISA in isa (RT66112::T3 isa RT66112::A)") or require mro, diag "@{mro::get_linear_isa('RT66112::T3')}";
27889255
B
321
322 @RT66112::E::ISA = qw/RT66112::D/;
323 @RT66112::T4::ISA = qw/RT66112::E/;
324 ok(RT66112::T4->isa('RT66112::E'), "modify \@ISA in isa (RT66112::T4 isa RT66112::E)");
325
326 @RT66112::E::ISA = qw/RT66112::D/;
327 @RT66112::T5::ISA = qw/RT66112::E/;
328 ok(! RT66112::T5->isa('RT66112::D'), "modify \@ISA in isa (RT66112::T5 not isa RT66112::D)");
329
330 @RT66112::E::ISA = qw/RT66112::D/;
331 @RT66112::T6::ISA = qw/RT66112::E/;
332 ok(RT66112::T6->isa('RT66112::A'), "modify \@ISA in isa (RT66112::T6 isa RT66112::A)");
333}