xref: /openbsd/gnu/usr.bin/perl/t/op/universal.t (revision a6445c1d) 
1#!./perl
2#
3# check UNIVERSAL
4#
5
6BEGIN {
7    chdir 't' if -d 't';
8    @INC = '../lib';
9    $| = 1;
10    require "./test.pl";
11}
12
13plan tests => 144;
14
15$a = {};
16bless $a, "Bob";
17ok $a->isa("Bob");
18
19package Human;
20sub eat {}
21
22package Female;
23@ISA=qw(Human);
24
25package Alice;
26@ISA=qw(Bob Female);
27sub sing;
28sub drink { return "drinking " . $_[1]  }
29sub new { bless {} }
30
31$Alice::VERSION = 2.718;
32
33{
34    package Cedric;
35    our @ISA;
36    use base qw(Human);
37}
38
39{
40    package Programmer;
41    our $VERSION = 1.667;
42
43    sub write_perl { 1 }
44}
45
46package main;
47
48
49
50$a = new Alice;
51
52ok $a->isa("Alice");
53ok $a->isa("main::Alice");    # check that alternate class names work
54
55ok(("main::Alice"->new)->isa("Alice"));
56
57ok $a->isa("Bob");
58ok $a->isa("main::Bob");
59
60ok $a->isa("Female");
61
62ok ! $a->isa("Female\0NOT REALLY!"), "->isa is nul-clean.";
63
64ok $a->isa("Human");
65
66ok ! $a->isa("Male");
67
68ok ! $a->isa('Programmer');
69
70ok $a->isa("HASH");
71
72ok $a->can("eat");
73ok ! $a->can("eat\0Except not!"), "->can is nul-clean.";
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");
78eval { $a->$ref() };
79ok $@;                                # ... but not if no actual subroutine
80
81ok (!Cedric->isa('Programmer'));
82
83ok (Cedric->isa('Human'));
84
85push(@Cedric::ISA,'Programmer');
86
87ok (Cedric->isa('Programmer'));
88
89{
90    package Alice;
91    base::->import('Programmer');
92}
93
94ok $a->isa('Programmer');
95ok $a->isa("Female");
96
97@Cedric::ISA = qw(Bob);
98
99ok (!Cedric->isa('Programmer'));
100
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; $q++) {
106        is UNIVERSAL::isa($vals[$p], $refs[$q]), ($p==$q or $p+$q==1);
107    };
108};
109
110ok UNIVERSAL::can(23, "can");
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';
114sub IO::Handle::turn {}
115ok UNIVERSAL::can(*STDOUT, 'turn'), 'globs with IOs can';
116ok UNIVERSAL::can(\*STDOUT, 'turn'), 'globrefs with IOs can';
117ok UNIVERSAL::can("STDOUT", 'turn'), 'IO barewords can';
118
119ok $a->can("VERSION");
120
121ok $a->can("can");
122ok ! $a->can("export_tags");	# a method in Exporter
123
124cmp_ok eval { $a->VERSION }, '==', 2.718;
125
126ok ! (eval { $a->VERSION(2.719) });
127like $@, qr/^Alice version 2.719 required--this is only version 2.718 at /;
128
129ok (eval { $a->VERSION(2.718) });
130is $@, '';
131
132ok ! (eval { $a->VERSION("version") });
133like $@, qr/^Invalid version format/;
134
135$aversion::VERSION = "version";
136ok ! (eval { aversion->VERSION(2.719) });
137like $@, qr/^Invalid version format/;
138
139my $subs = join ' ', sort grep { defined &{"UNIVERSAL::$_"} } keys %UNIVERSAL::;
140## The test for import here is *not* because we want to ensure that UNIVERSAL
141## can always import; it is an historical accident that UNIVERSAL can import.
142if ('a' lt 'A') {
143    is $subs, "can import isa DOES VERSION";
144} else {
145    is $subs, "DOES VERSION can import isa";
146}
147
148ok $a->isa("UNIVERSAL");
149
150ok ! UNIVERSAL::isa([], "UNIVERSAL");
151
152ok ! UNIVERSAL::can({}, "can");
153
154ok UNIVERSAL::isa(Alice => "UNIVERSAL");
155
156cmp_ok UNIVERSAL::can(Alice => "can"), '==', \&UNIVERSAL::can;
157
158# now use UNIVERSAL.pm and see what changes
159eval "use UNIVERSAL";
160
161ok $a->isa("UNIVERSAL");
162
163my $sub2 = join ' ', sort grep { defined &{"UNIVERSAL::$_"} } keys %UNIVERSAL::;
164# XXX import being here is really a bug
165if ('a' lt 'A') {
166    is $sub2, "can import isa DOES VERSION";
167} else {
168    is $sub2, "DOES VERSION can import isa";
169}
170
171eval 'sub UNIVERSAL::sleep {}';
172ok $a->can("sleep");
173
174ok UNIVERSAL::can($b, "can");
175
176ok ! $a->can("export_tags");	# a method in Exporter
177
178ok ! UNIVERSAL::isa("\xff\xff\xff\0", 'HASH');
179
180{
181    package Pickup;
182    no warnings "deprecated";
183    use UNIVERSAL qw( isa can VERSION );
184
185    ::ok isa "Pickup", UNIVERSAL;
186    ::cmp_ok can( "Pickup", "can" ), '==', \&UNIVERSAL::can;
187    ::ok VERSION "UNIVERSAL" ;
188}
189
190{
191    # test isa() and can() on magic variables
192    "Human" =~ /(.*)/;
193    ok $1->isa("Human");
194    ok $1->can("eat");
195    package HumanTie;
196    sub TIESCALAR { bless {} }
197    sub FETCH { "Human" }
198    tie my($x), "HumanTie";
199    ::ok $x->isa("Human");
200    ::ok $x->can("eat");
201}
202
203# bugid 3284
204# a second call to isa('UNIVERSAL') when @ISA is null failed due to caching
205
206@X::ISA=();
207my $x = {}; bless $x, 'X';
208ok $x->isa('UNIVERSAL');
209ok $x->isa('UNIVERSAL');
210
211
212# Check that the "historical accident" of UNIVERSAL having an import()
213# method doesn't effect anyone else.
214eval { Some::Package->import("bar") };
215is $@, '';
216
217
218# This segfaulted in a blead.
219fresh_perl_is('package Foo; Foo->VERSION;  print "ok"', 'ok');
220
221# So did this.
222fresh_perl_is('$:; UNIVERSAL::isa(":","Unicode::String");print "ok"','ok');
223
224package Foo;
225
226sub DOES { 1 }
227
228package Bar;
229
230@Bar::ISA = 'Foo';
231
232package Baz;
233
234package main;
235ok( Foo->DOES( 'bar' ), 'DOES() should call DOES() on class' );
236ok( Bar->DOES( 'Bar' ), '... and should fall back to isa()' );
237ok( Bar->DOES( 'Foo' ), '... even when inherited' );
238ok( Baz->DOES( 'Baz' ), '... even without inheriting any other DOES()' );
239ok( ! Baz->DOES( 'Foo' ), '... returning true or false appropriately' );
240
241ok( ! "T"->DOES( "T\0" ), 'DOES() is nul-clean' );
242ok( ! Baz->DOES( "Baz\0Boy howdy" ), 'DOES() is nul-clean' );
243
244package Pig;
245package Bodine;
246Bodine->isa('Pig');
247*isa = \&UNIVERSAL::isa;
248eval { isa({}, 'HASH') };
249::is($@, '', "*isa correctly found");
250
251package main;
252eval { UNIVERSAL::DOES([], "foo") };
253like( $@, qr/Can't call method "DOES" on unblessed reference/,
254    'DOES call error message says DOES, not isa' );
255
256# Tests for can seem to be split between here and method.t
257# Add the verbatim perl code mentioned in the comments of
258# http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/2001-05/msg01710.html
259# but never actually tested.
260is(UNIVERSAL->can("NoSuchPackage::foo"), undef);
261
262@splatt::ISA = 'zlopp';
263ok (splatt->isa('zlopp'));
264ok (!splatt->isa('plop'));
265
266# This should reset the ->isa lookup cache
267@splatt::ISA = 'plop';
268# And here is the new truth.
269ok (!splatt->isa('zlopp'));
270ok (splatt->isa('plop'));
271
272use warnings "deprecated";
273{
274    my $m;
275    local $SIG{__WARN__} = sub { $m = $_[0] };
276    eval "use UNIVERSAL 'can'";
277    like($m, qr/^UNIVERSAL->import is deprecated/,
278	"deprecation warning for UNIVERSAL->import('can')");
279
280	  undef $m;
281    eval "use UNIVERSAL";
282    is($m, undef,
283	"no deprecation warning for UNIVERSAL->import");
284}
285
286# Test: [perl #66112]: change @ISA inside  sub isa
287{
288    package RT66112::A;
289
290    package RT66112::B;
291
292    sub isa {
293	my $self = shift;
294	@ISA = qw/RT66112::A/;
295	return $self->SUPER::isa(@_);
296    }
297
298    package RT66112::C;
299
300    package RT66112::D;
301
302    sub isa {
303	my $self = shift;
304	@RT66112::E::ISA = qw/RT66112::A/;
305	return $self->SUPER::isa(@_);
306    }
307
308    package RT66112::E;
309
310    package main;
311
312    @RT66112::B::ISA = qw//;
313    @RT66112::C::ISA = qw/RT66112::B/;
314    @RT66112::T1::ISA = qw/RT66112::C/;
315    ok(RT66112::T1->isa('RT66112::C'), "modify \@ISA in isa (RT66112::T1 isa RT66112::C)");
316
317    @RT66112::B::ISA = qw//;
318    @RT66112::C::ISA = qw/RT66112::B/;
319    @RT66112::T2::ISA = qw/RT66112::C/;
320    ok(RT66112::T2->isa('RT66112::B'), "modify \@ISA in isa (RT66112::T2 isa RT66112::B)");
321
322    @RT66112::B::ISA = qw//;
323    @RT66112::C::ISA = qw/RT66112::B/;
324    @RT66112::T3::ISA = qw/RT66112::C/;
325    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')}";
326
327    @RT66112::E::ISA = qw/RT66112::D/;
328    @RT66112::T4::ISA = qw/RT66112::E/;
329    ok(RT66112::T4->isa('RT66112::E'), "modify \@ISA in isa (RT66112::T4 isa RT66112::E)");
330
331    @RT66112::E::ISA = qw/RT66112::D/;
332    @RT66112::T5::ISA = qw/RT66112::E/;
333    ok(! RT66112::T5->isa('RT66112::D'), "modify \@ISA in isa (RT66112::T5 not isa RT66112::D)");
334
335    @RT66112::E::ISA = qw/RT66112::D/;
336    @RT66112::T6::ISA = qw/RT66112::E/;
337    ok(RT66112::T6->isa('RT66112::A'), "modify \@ISA in isa (RT66112::T6 isa RT66112::A)");
338}
339
340ok(Undeclared->can("can"));
341sub Undeclared::foo { }
342ok(Undeclared->can("foo"));
343ok(!Undeclared->can("something_else"));
344
345ok(Undeclared->isa("UNIVERSAL"));
346
347# keep this at the end to avoid messing up earlier tests, since it modifies
348# @UNIVERSAL::ISA
349@UNIVERSAL::ISA = ('UniversalParent');
350{ package UniversalIsaTest1; }
351ok(UniversalIsaTest1->isa('UniversalParent'));
352ok(UniversalIsaTest2->isa('UniversalParent'));
353