14 # The behaviour of the feature pragma should be tested by lib/switch.t
15 # using the tests in t/lib/switch/*. This file tests the behaviour of
16 # the switch ops themselves.
21 like($@, qr/^Can't "continue" outside/, "continue outside");
24 like($@, qr/^Can't "break" outside/, "break outside");
30 given(my $x = "bar") {
31 is($x, "bar", "given scope starts");
33 is($x, "foo", "given scope ends");
38 given(my $x = "foo") {
39 when(be_true(my $x = "bar")) {
40 is($x, "bar", "given scope starts");
42 is($x, "foo", "given scope ends");
46 given("inside") { check_outside1() }
47 sub check_outside1 { is($_, "outside", "\$_ lexically scoped") }
51 given("inside") { check_outside2() }
53 is($_, "outside", "\$_ lexically scoped (lexical \$_)")
57 # Basic string/numeric comparisons and control flow
62 when(2) { $ok = 'two'; }
63 when(3) { $ok = 'three'; }
64 when(4) { $ok = 'four'; }
65 default { $ok = 'd'; }
67 is($ok, 'three', "numeric comparison");
74 when(2) { $ok = 'two'; }
75 when(3) { $ok = 'three'; }
76 when(4) { $ok = 'four'; }
77 default { $ok = 'd'; }
79 is($ok, 'three', "integer comparison");
85 when(3.1) { $ok1 = 'n'; }
86 when(3.0) { $ok1 = 'y'; continue }
87 when("3.0") { $ok2 = 'y'; }
88 default { $ok2 = 'n'; }
90 is($ok1, 'y', "more numeric (pt. 1)");
91 is($ok2, 'y', "more numeric (pt. 2)");
97 when("b") { $ok = 'B'; }
98 when("c") { $ok = 'C'; }
99 when("d") { $ok = 'D'; }
100 default { $ok = 'def'; }
102 is($ok, 'C', "string comparison");
108 when("b") { $ok = 'B'; }
109 when("c") { $ok = 'C'; continue }
110 when("c") { $ok = 'CC'; }
111 default { $ok = 'D'; }
113 is($ok, 'CC', "simple continue");
119 given (0) { when(undef) {$ok = 0} }
120 is($ok, 1, "Given(0) when(undef)");
125 given (0) { when($undef) {$ok = 0} }
126 is($ok, 1, 'Given(0) when($undef)');
131 given (0) { when($undef++) {$ok = 1} }
132 is($ok, 1, "Given(0) when($undef++)");
135 no warnings "uninitialized";
137 given (undef) { when(0) {$ok = 0} }
138 is($ok, 1, "Given(undef) when(0)");
141 no warnings "uninitialized";
144 given ($undef) { when(0) {$ok = 0} }
145 is($ok, 1, 'Given($undef) when(0)');
150 given ("") { when(undef) {$ok = 0} }
151 is($ok, 1, 'Given("") when(undef)');
156 given ("") { when($undef) {$ok = 0} }
157 is($ok, 1, 'Given("") when($undef)');
160 no warnings "uninitialized";
162 given (undef) { when("") {$ok = 0} }
163 is($ok, 1, 'Given(undef) when("")');
166 no warnings "uninitialized";
169 given ($undef) { when("") {$ok = 0} }
170 is($ok, 1, 'Given($undef) when("")');
175 given (undef) { when(undef) {$ok = 1} }
176 is($ok, 1, "Given(undef) when(undef)");
181 given (undef) { when($undef) {$ok = 1} }
182 is($ok, 1, 'Given(undef) when($undef)');
187 given ($undef) { when(undef) {$ok = 1} }
188 is($ok, 1, 'Given($undef) when(undef)');
193 given ($undef) { when($undef) {$ok = 1} }
194 is($ok, 1, 'Given($undef) when($undef)');
198 # Regular expressions
201 given("Hello, world!") {
203 { $ok1 = 'y'; continue}
205 { $ok1 = 'n'; continue}
206 when(/^(Hello,|Goodbye cruel) world[!.?]/)
207 { $ok2 = 'Y'; continue}
208 when(/^(Hello cruel|Goodbye,) world[!.?]/)
209 { $ok2 = 'n'; continue}
211 is($ok1, 'y', "regex 1");
212 is($ok2, 'Y', "regex 2");
217 my $test = "explicit numeric comparison (<)";
218 my $twenty_five = 25;
220 given($twenty_five) {
221 when ($_ < 10) { $ok = "ten" }
222 when ($_ < 20) { $ok = "twenty" }
223 when ($_ < 30) { $ok = "thirty" }
224 when ($_ < 40) { $ok = "forty" }
225 default { $ok = "default" }
227 is($ok, "thirty", $test);
232 my $test = "explicit numeric comparison (integer <)";
233 my $twenty_five = 25;
235 given($twenty_five) {
236 when ($_ < 10) { $ok = "ten" }
237 when ($_ < 20) { $ok = "twenty" }
238 when ($_ < 30) { $ok = "thirty" }
239 when ($_ < 40) { $ok = "forty" }
240 default { $ok = "default" }
242 is($ok, "thirty", $test);
246 my $test = "explicit numeric comparison (<=)";
247 my $twenty_five = 25;
249 given($twenty_five) {
250 when ($_ <= 10) { $ok = "ten" }
251 when ($_ <= 20) { $ok = "twenty" }
252 when ($_ <= 30) { $ok = "thirty" }
253 when ($_ <= 40) { $ok = "forty" }
254 default { $ok = "default" }
256 is($ok, "thirty", $test);
261 my $test = "explicit numeric comparison (integer <=)";
262 my $twenty_five = 25;
264 given($twenty_five) {
265 when ($_ <= 10) { $ok = "ten" }
266 when ($_ <= 20) { $ok = "twenty" }
267 when ($_ <= 30) { $ok = "thirty" }
268 when ($_ <= 40) { $ok = "forty" }
269 default { $ok = "default" }
271 is($ok, "thirty", $test);
276 my $test = "explicit numeric comparison (>)";
277 my $twenty_five = 25;
279 given($twenty_five) {
280 when ($_ > 40) { $ok = "forty" }
281 when ($_ > 30) { $ok = "thirty" }
282 when ($_ > 20) { $ok = "twenty" }
283 when ($_ > 10) { $ok = "ten" }
284 default { $ok = "default" }
286 is($ok, "twenty", $test);
290 my $test = "explicit numeric comparison (>=)";
291 my $twenty_five = 25;
293 given($twenty_five) {
294 when ($_ >= 40) { $ok = "forty" }
295 when ($_ >= 30) { $ok = "thirty" }
296 when ($_ >= 20) { $ok = "twenty" }
297 when ($_ >= 10) { $ok = "ten" }
298 default { $ok = "default" }
300 is($ok, "twenty", $test);
305 my $test = "explicit numeric comparison (integer >)";
306 my $twenty_five = 25;
308 given($twenty_five) {
309 when ($_ > 40) { $ok = "forty" }
310 when ($_ > 30) { $ok = "thirty" }
311 when ($_ > 20) { $ok = "twenty" }
312 when ($_ > 10) { $ok = "ten" }
313 default { $ok = "default" }
315 is($ok, "twenty", $test);
320 my $test = "explicit numeric comparison (integer >=)";
321 my $twenty_five = 25;
323 given($twenty_five) {
324 when ($_ >= 40) { $ok = "forty" }
325 when ($_ >= 30) { $ok = "thirty" }
326 when ($_ >= 20) { $ok = "twenty" }
327 when ($_ >= 10) { $ok = "ten" }
328 default { $ok = "default" }
330 is($ok, "twenty", $test);
335 my $test = "explicit string comparison (lt)";
336 my $twenty_five = "25";
338 given($twenty_five) {
339 when ($_ lt "10") { $ok = "ten" }
340 when ($_ lt "20") { $ok = "twenty" }
341 when ($_ lt "30") { $ok = "thirty" }
342 when ($_ lt "40") { $ok = "forty" }
343 default { $ok = "default" }
345 is($ok, "thirty", $test);
349 my $test = "explicit string comparison (le)";
350 my $twenty_five = "25";
352 given($twenty_five) {
353 when ($_ le "10") { $ok = "ten" }
354 when ($_ le "20") { $ok = "twenty" }
355 when ($_ le "30") { $ok = "thirty" }
356 when ($_ le "40") { $ok = "forty" }
357 default { $ok = "default" }
359 is($ok, "thirty", $test);
363 my $test = "explicit string comparison (gt)";
364 my $twenty_five = 25;
366 given($twenty_five) {
367 when ($_ ge "40") { $ok = "forty" }
368 when ($_ ge "30") { $ok = "thirty" }
369 when ($_ ge "20") { $ok = "twenty" }
370 when ($_ ge "10") { $ok = "ten" }
371 default { $ok = "default" }
373 is($ok, "twenty", $test);
377 my $test = "explicit string comparison (ge)";
378 my $twenty_five = 25;
380 given($twenty_five) {
381 when ($_ ge "40") { $ok = "forty" }
382 when ($_ ge "30") { $ok = "thirty" }
383 when ($_ ge "20") { $ok = "twenty" }
384 when ($_ ge "10") { $ok = "ten" }
385 default { $ok = "default" }
387 is($ok, "twenty", $test);
390 # Make sure it still works with a lexical $_:
393 my $test = "explicit comparison with lexical \$_";
394 my $twenty_five = 25;
396 given($twenty_five) {
397 when ($_ ge "40") { $ok = "forty" }
398 when ($_ ge "30") { $ok = "thirty" }
399 when ($_ ge "20") { $ok = "twenty" }
400 when ($_ ge "10") { $ok = "ten" }
401 default { $ok = "default" }
403 is($ok, "twenty", $test);
406 # Optimized-away comparisons
410 when (2 + 2 == 4) { $ok = 'y'; continue }
411 when (2 + 2 == 5) { $ok = 'n' }
413 is($ok, 'y', "Optimized-away comparison");
417 # (How to be both thorough and portable? Pinch a few ideas
418 # from t/op/filetest.t. We err on the side of portability for
422 my ($ok_d, $ok_f, $ok_r);
424 when(-d) {$ok_d = 1; continue}
425 when(!-f) {$ok_f = 1; continue}
426 when(-r) {$ok_r = 1; continue}
428 ok($ok_d, "Filetest -d");
429 ok($ok_f, "Filetest -f");
430 ok($ok_r, "Filetest -r");
433 # Sub and method calls
438 when(notfoo()) {$ok = 1}
440 ok($ok, "Sub call acts as boolean")
446 when(main->notfoo()) {$ok = 1}
448 ok($ok, "Class-method call acts as boolean")
455 when($obj->notfoo()) {$ok = 1}
457 ok($ok, "Object-method call acts as boolean")
460 # Other things that should not be smart matched
464 when( /(\d+)/ and ( 1 <= $1 and $1 <= 12 ) ) {
468 ok($ok, "bool not smartmatches");
478 ok($ok, "eof() not smartmatched");
483 my %foo = ("bar", 0);
485 when(exists $foo{bar}) {
489 ok($ok, "exists() not smartmatched");
499 ok($ok, "defined() not smartmatched");
505 when((1 == 1) && "bar") {
508 when((1 == 1) && $_ eq "foo") {
512 is($ok, 2, "((1 == 1) && \"bar\") not smartmatched");
517 for my $l qw(a b c d) {
519 when ($_ eq "b" .. $_ eq "c") { $n = 1 }
522 ok(($n xor $l =~ /[ad]/), 'when(E1..E2) evaluates in boolean context');
528 for my $l qw(a b c d) {
530 when ($_ eq "b" ... $_ eq "c") { $n = 1 }
533 ok(($n xor $l =~ /[ad]/), 'when(E1...E2) evaluates in boolean context');
540 when((1 == $ok) || "foo") {
544 ok($ok, '((1 == $ok) || "foo") smartmatched');
550 when((1 == $ok || undef) // "foo") {
554 ok($ok, '((1 == $ok || undef) // "foo") smartmatched');
557 # Make sure we aren't invoking the get-magic more than once
559 { # A helper class to count the number of accesses.
560 package FetchCounter;
563 bless {value => undef, count => 0}, $class;
566 my ($self, $val) = @_;
568 $self->{value} = $val;
572 # Avoid pre/post increment here
573 $self->{count} = 1 + $self->{count};
582 my $f = tie my $v, "FetchCounter";
584 { my $test_name = "Only one FETCH (in given)";
594 is($ok, 1, "precheck: $test_name");
595 is($f->count(), 1, $test_name);
598 { my $test_name = "Only one FETCH (numeric when)";
601 is($f->count(), 0, "Sanity check: $test_name");
610 is($ok, 1, "precheck: $test_name");
611 is($f->count(), 1, $test_name);
614 { my $test_name = "Only one FETCH (string when)";
617 is($f->count(), 0, "Sanity check: $test_name");
626 is($ok, 1, "precheck: $test_name");
627 is($f->count(), 1, $test_name);
630 { my $test_name = "Only one FETCH (undef)";
633 is($f->count(), 0, "Sanity check: $test_name");
634 no warnings "uninitialized";
640 when(undef) {$ok = 0}
642 is($ok, 1, "precheck: $test_name");
643 is($f->count(), 1, $test_name);
651 is($first, 0, "Loop: second");
653 like($@, qr/^Can't "break" in a loop topicalizer/,
654 q{Can't "break" in a loop topicalizer});
657 is($first, 1, "Loop: first");
659 # Implicit break is okay
668 is($first, 0, "Explicit \$_: second");
670 like($@, qr/^Can't "break" in a loop topicalizer/,
671 q{Can't "break" in a loop topicalizer});
674 is($first, 1, "Explicit \$_: first");
676 # Implicit break is okay
686 is($first, 0, "Implicitly lexical loop: second");
688 like($@, qr/^Can't "break" in a loop topicalizer/,
689 q{Can't "break" in a loop topicalizer});
692 is($first, 1, "Implicitly lexical loop: first");
694 # Implicit break is okay
704 is($first, 0, "Implicitly lexical, explicit \$_: second");
706 like($@, qr/^Can't "break" in a loop topicalizer/,
707 q{Can't "break" in a loop topicalizer});
710 is($first, 1, "Implicitly lexical, explicit \$_: first");
712 # Implicit break is okay
719 for my $_ (1, "two") {
721 is($first, 0, "Lexical loop: second");
723 like($@, qr/^Can't "break" in a loop topicalizer/,
724 q{Can't "break" in a loop topicalizer});
727 is($first, 1, "Lexical loop: first");
729 # Implicit break is okay
738 sub foo {$called_foo = 1; "@_" eq "foo"}
740 sub bar {$called_bar = 1; "@_" eq "bar"}
741 my ($matched_foo, $matched_bar) = (0, 0);
743 when(\&bar) {$matched_bar = 1}
744 when(\&foo) {$matched_foo = 1}
746 is($called_foo, 1, "foo() was called");
747 is($called_bar, 1, "bar() was called");
748 is($matched_bar, 0, "bar didn't match");
749 is($matched_foo, 1, "foo did match");
757 my ($ok1, $ok2) = (0,0);
760 { $ok1 = 1; continue }
762 { $ok2 = 1; continue }
764 is($ok1, 1, "Calling sub directly (true)");
765 is($ok2, 1, "Calling sub indirectly (true)");
769 { $ok1 = 2; continue }
771 { $ok2 = 2; continue }
773 is($ok1, 1, "Calling sub directly (false)");
774 is($ok2, 1, "Calling sub indirectly (false)");
778 skip "Scalar/Util.pm not yet available", 20
779 unless -r "$INC[0]/Scalar/Util.pm";
781 { package OverloadTest;
783 use overload '""' => sub{"string value of obj"};
784 use overload 'eq' => sub{"$_[0]" eq "$_[1]"};
786 use overload "~~" => sub {
787 my ($self, $other, $reversed) = @_;
789 $self->{left} = $other;
790 $self->{right} = $self;
791 $self->{reversed} = 1;
793 $self->{left} = $self;
794 $self->{right} = $other;
795 $self->{reversed} = 0;
798 return $self->{retval};
802 my ($pkg, $retval) = @_;
811 my $test = "Overloaded obj in given (true)";
812 my $obj = OverloadTest->new(1);
815 when ("other arg") {$matched = 1}
816 default {$matched = 0}
819 is($obj->{called}, 1, "$test: called");
820 ok($matched, "$test: matched");
824 my $test = "Overloaded obj in given (false)";
825 my $obj = OverloadTest->new(0);
828 when ("other arg") {$matched = 1}
831 is($obj->{called}, 1, "$test: called");
832 ok(!$matched, "$test: not matched");
836 my $test = "Overloaded obj in when (true)";
837 my $obj = OverloadTest->new(1);
840 when ($obj) {$matched = 1}
841 default {$matched = 0}
844 is($obj->{called}, 1, "$test: called");
845 ok($matched, "$test: matched");
846 is($obj->{left}, "topic", "$test: left");
847 is($obj->{right}, "string value of obj", "$test: right");
848 ok($obj->{reversed}, "$test: reversed");
852 my $test = "Overloaded obj in when (false)";
853 my $obj = OverloadTest->new(0);
856 when ($obj) {$matched = 1}
857 default {$matched = 0}
860 is($obj->{called}, 1, "$test: called");
861 ok(!$matched, "$test: not matched");
862 is($obj->{left}, "topic", "$test: left");
863 is($obj->{right}, "string value of obj", "$test: right");
864 ok($obj->{reversed}, "$test: reversed");
874 is($ok, 1, "postfix undef");
880 $ok += 2 when 9.1685;
881 $ok += 4 when $_ > 4;
882 $ok += 8 when $_ < 2.5;
884 is($ok, 8, "postfix numeric");
889 $ok = 1, continue when $_ eq "apple";
891 $ok = 0 when "banana";
893 is($ok, 3, "postfix string");
898 do { $ok = 1; continue } when /pea/;
904 is($ok, 7, "postfix regex");
906 # be_true is defined at the beginning of the file
909 given(my $x = "foo") {
911 is($x, "foo", "scope inside ... when my \$x = ...");
913 } when be_true(my $x = "bar");
914 is($x, "bar", "scope after ... when my \$x = ...");
920 my $x = 2, continue when be_true();
921 is($x, undef, "scope after my \$x = ... when ...");
925 # Tests for last and next in when clauses
936 is($letter, "b", "last in when");
939 LETTER1: for ("a".."e") {
942 when ("b") { last LETTER1 }
946 is($letter, "b", "last LABEL in when");
951 when (/b|d/) { next }
956 is($letter, "a,c,e,", "next in when");
959 LETTER2: for ("a".."e") {
961 when (/b|d/) { next LETTER2 }
966 is($letter, "a,c,e,", "next LABEL in when");
968 # Test goto with given/when
973 GIVEN1: given ($flag) {
977 is($flag, 0, "goto GIVEN1");
982 when (0) { $flag = 1; }
987 is($flag, 1, "goto inside given");
992 when (0) { $flag = 1; goto GIVEN3; $flag = 2; }
996 is($flag, 1, "goto inside given and when");
1001 when (0) { $flag = 1; goto GIVEN4; $flag = 2; }
1005 is($flag, 1, "goto inside for and when");
1011 when (0) { $flag = 1; goto GIVEN5; $flag = 2; }
1015 is($flag, 1, "goto inside given and when to the given stmt");
1018 # Okay, that'll do for now. The intricacies of the smartmatch
1019 # semantics are tested in t/op/smartmatch.t