xref: /openbsd-src/gnu/usr.bin/perl/t/op/universal.t (revision 3d61058aa5c692477b6d18acfbbdb653a9930ff9) 
1#!./perl
2#
3# check UNIVERSAL
4#
5
6BEGIN {
7    chdir 't' if -d 't';
8    require './test.pl';
9    set_up_inc(qw '../lib ../dist/base/lib');
10    $| = 1;
11    require "./test.pl";
12}
13
14plan tests => 144;
15
16$a = {};
17bless $a, "Bob";
18ok $a->isa("Bob");
19
20package Human;
21sub eat {}
22
23package Female;
24@ISA=qw(Human);
25
26package Alice;
27@ISA=qw(Bob Female);
28sub sing;
29sub drink { return "drinking " . $_[1]  }
30sub new { bless {} }
31
32$Alice::VERSION = 2.718;
33
34{
35    package Cedric;
36    our @ISA;
37    use base qw(Human);
38}
39
40{
41    package Programmer;
42    our $VERSION = 1.667;
43
44    sub write_perl { 1 }
45}
46
47package main;
48
49
50
51$a = new Alice;
52
53ok $a->isa("Alice");
54ok $a->isa("main::Alice");    # check that alternate class names work
55
56ok(("main::Alice"->new)->isa("Alice"));
57
58ok $a->isa("Bob");
59ok $a->isa("main::Bob");
60
61ok $a->isa("Female");
62
63ok ! $a->isa("Female\0NOT REALLY!"), "->isa is nul-clean.";
64
65ok $a->isa("Human");
66
67ok ! $a->isa("Male");
68
69ok ! $a->isa('Programmer');
70
71ok $a->isa("HASH");
72
73ok $a->can("eat");
74ok ! $a->can("eat\0Except not!"), "->can is nul-clean.";
75ok ! $a->can("sleep");
76ok my $ref = $a->can("drink");        # returns a coderef
77is $a->$ref("tea"), "drinking tea"; # ... which works
78ok $ref = $a->can("sing");
79eval { $a->$ref() };
80ok $@;                                # ... but not if no actual subroutine
81
82ok (!Cedric->isa('Programmer'));
83
84ok (Cedric->isa('Human'));
85
86push(@Cedric::ISA,'Programmer');
87
88ok (Cedric->isa('Programmer'));
89
90{
91    package Alice;
92    base::->import('Programmer');
93}
94
95ok $a->isa('Programmer');
96ok $a->isa("Female");
97
98@Cedric::ISA = qw(Bob);
99
100ok (!Cedric->isa('Programmer'));
101
102my $b = 'abc';
103my @refs = qw(SCALAR SCALAR     LVALUE      GLOB ARRAY HASH CODE);
104my @vals = (  \$b,   \3.14, \substr($b,1,1), \*b,  [],  {}, sub {} );
105for ($p=0; $p < @refs; $p++) {
106    for ($q=0; $q < @vals; $q++) {
107        is UNIVERSAL::isa($vals[$p], $refs[$q]), ($p==$q or $p+$q==1);
108    };
109};
110
111ok UNIVERSAL::can(23, "can");
112++${"23::foo"};
113ok UNIVERSAL::can("23", "can"), '"23" can can when the pack exists';
114ok UNIVERSAL::can(23, "can"), '23 can can when the pack exists';
115sub IO::Handle::turn {}
116ok UNIVERSAL::can(*STDOUT, 'turn'), 'globs with IOs can';
117ok UNIVERSAL::can(\*STDOUT, 'turn'), 'globrefs with IOs can';
118ok UNIVERSAL::can("STDOUT", 'turn'), 'IO barewords can';
119
120ok $a->can("VERSION");
121
122ok $a->can("can");
123ok ! $a->can("export_tags");	# a method in Exporter
124
125cmp_ok eval { $a->VERSION }, '==', 2.718;
126
127ok ! (eval { $a->VERSION(2.719) });
128like $@, qr/^Alice version 2.719 required--this is only version 2.718 at /;
129
130ok (eval { $a->VERSION(2.718) });
131is $@, '';
132
133ok ! (eval { $a->VERSION("version") });
134like $@, qr/^Invalid version format/;
135
136$aversion::VERSION = "version";
137ok ! (eval { aversion->VERSION(2.719) });
138like $@, qr/^Invalid version format/;
139
140my $subs = join ' ', sort grep { defined &{"UNIVERSAL::$_"} } keys %UNIVERSAL::;
141if ('a' lt 'A') {
142    is $subs, "can import isa unimport DOES VERSION";
143} else {
144    is $subs, "DOES VERSION can import isa unimport";
145}
146
147ok $a->isa("UNIVERSAL");
148
149ok ! UNIVERSAL::isa([], "UNIVERSAL");
150
151ok ! UNIVERSAL::can({}, "can");
152
153ok UNIVERSAL::isa(Alice => "UNIVERSAL");
154
155cmp_ok UNIVERSAL::can(Alice => "can"), '==', \&UNIVERSAL::can;
156
157# now use UNIVERSAL.pm and see what changes
158eval "use UNIVERSAL";
159
160ok $a->isa("UNIVERSAL");
161
162my $sub2 = join ' ', sort grep { defined &{"UNIVERSAL::$_"} } keys %UNIVERSAL::;
163if ('a' lt 'A') {
164    is $sub2, "can import isa unimport DOES VERSION";
165} else {
166    is $sub2, "DOES VERSION can import isa unimport";
167}
168
169eval 'sub UNIVERSAL::sleep {}';
170ok $a->can("sleep");
171
172ok UNIVERSAL::can($b, "can");
173
174ok ! $a->can("export_tags");	# a method in Exporter
175
176ok ! UNIVERSAL::isa("\xff\xff\xff\0", 'HASH');
177
178{
179    # test isa() and can() on magic variables
180    "Human" =~ /(.*)/;
181    ok $1->isa("Human");
182    ok $1->can("eat");
183    package HumanTie;
184    sub TIESCALAR { bless {} }
185    sub FETCH { "Human" }
186    tie my($x), "HumanTie";
187    ::ok $x->isa("Human");
188    ::ok $x->can("eat");
189}
190
191# bugid 3284
192# a second call to isa('UNIVERSAL') when @ISA is null failed due to caching
193
194@X::ISA=();
195my $x = {}; bless $x, 'X';
196ok $x->isa('UNIVERSAL');
197ok $x->isa('UNIVERSAL');
198
199
200{
201    my $err;
202    $SIG{__WARN__}= sub { die $_[0] };
203    eval { Some::Package->import("bar") };
204    my $err = $@;
205    $err=~s!t/op!op!;
206    is $err, "Attempt to call undefined import method with arguments (\"bar\")"
207           . " via package \"Some::Package\" (Perhaps you forgot to load"
208           . " the package?) at op/universal.t line 203.\n";
209    eval { Some::Package->unimport(1.234) };
210    $err = $@;
211    $err=~s!t/op!op!;
212    is $err, "Attempt to call undefined unimport method with arguments (\"1.234\")"
213           . " via package \"Some::Package\" (Perhaps you forgot to load"
214           . " the package?) at op/universal.t line 209.\n";
215
216}
217
218# This segfaulted in a blead.
219fresh_perl_is('package Foo; Foo->VERSION;  print "ok"', 'ok');
220
221# So did this.
222fresh_perl_is('$:; 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# Message-ID: E14ufZD-0007kD-00@libra.cus.cam.ac.uk
259# https://www.nntp.perl.org/group/perl.perl5.porters/2001/05/msg35327.html
260# but never actually tested.
261is(UNIVERSAL->can("NoSuchPackage::foo"), undef);
262
263@splatt::ISA = 'zlopp';
264ok (splatt->isa('zlopp'));
265ok (!splatt->isa('plop'));
266
267# This should reset the ->isa lookup cache
268@splatt::ISA = 'plop';
269# And here is the new truth.
270ok (!splatt->isa('zlopp'));
271ok (splatt->isa('plop'));
272
273use warnings "deprecated";
274{
275    my $m;
276    local $SIG{__WARN__} = sub { $m = $_[0] };
277    eval "use UNIVERSAL 'can'";
278    like($@, qr/^UNIVERSAL does not export anything\b/,
279	"error for UNIVERSAL->import('can')");
280    is($m, undef,
281	"no deprecation warning for UNIVERSAL->import('can')");
282
283	  undef $m;
284    eval "use UNIVERSAL";
285    is($@, "",
286	"no error for UNIVERSAL->import");
287    is($m, undef,
288	"no deprecation warning for UNIVERSAL->import");
289}
290
291# Test: [perl #66112]: change @ISA inside  sub isa
292{
293    package RT66112::A;
294
295    package RT66112::B;
296
297    sub isa {
298	my $self = shift;
299	@ISA = qw/RT66112::A/;
300	return $self->SUPER::isa(@_);
301    }
302
303    package RT66112::C;
304
305    package RT66112::D;
306
307    sub isa {
308	my $self = shift;
309	@RT66112::E::ISA = qw/RT66112::A/;
310	return $self->SUPER::isa(@_);
311    }
312
313    package RT66112::E;
314
315    package main;
316
317    @RT66112::B::ISA = qw//;
318    @RT66112::C::ISA = qw/RT66112::B/;
319    @RT66112::T1::ISA = qw/RT66112::C/;
320    ok(RT66112::T1->isa('RT66112::C'), "modify \@ISA in isa (RT66112::T1 isa RT66112::C)");
321
322    @RT66112::B::ISA = qw//;
323    @RT66112::C::ISA = qw/RT66112::B/;
324    @RT66112::T2::ISA = qw/RT66112::C/;
325    ok(RT66112::T2->isa('RT66112::B'), "modify \@ISA in isa (RT66112::T2 isa RT66112::B)");
326
327    @RT66112::B::ISA = qw//;
328    @RT66112::C::ISA = qw/RT66112::B/;
329    @RT66112::T3::ISA = qw/RT66112::C/;
330    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')}";
331
332    @RT66112::E::ISA = qw/RT66112::D/;
333    @RT66112::T4::ISA = qw/RT66112::E/;
334    ok(RT66112::T4->isa('RT66112::E'), "modify \@ISA in isa (RT66112::T4 isa RT66112::E)");
335
336    @RT66112::E::ISA = qw/RT66112::D/;
337    @RT66112::T5::ISA = qw/RT66112::E/;
338    ok(! RT66112::T5->isa('RT66112::D'), "modify \@ISA in isa (RT66112::T5 not isa RT66112::D)");
339
340    @RT66112::E::ISA = qw/RT66112::D/;
341    @RT66112::T6::ISA = qw/RT66112::E/;
342    ok(RT66112::T6->isa('RT66112::A'), "modify \@ISA in isa (RT66112::T6 isa RT66112::A)");
343}
344
345ok(Undeclared->can("can"));
346sub Undeclared::foo { }
347ok(Undeclared->can("foo"));
348ok(!Undeclared->can("something_else"));
349
350ok(Undeclared->isa("UNIVERSAL"));
351
352# keep this at the end to avoid messing up earlier tests, since it modifies
353# @UNIVERSAL::ISA
354@UNIVERSAL::ISA = ('UniversalParent');
355{ package UniversalIsaTest1; }
356ok(UniversalIsaTest1->isa('UniversalParent'));
357ok(UniversalIsaTest2->isa('UniversalParent'));
358