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|
#!perl -T
use strict;
use warnings;
use Test::More tests => 18;
use Scope::Upper qw<yield leave>;
my @res;
@res = (0, eval {
yield;
1;
}, 2);
is $@, '', 'yield() does not croak';
is_deeply \@res, [ 0, 2 ], 'yield() in eval { ... }';
@res = (3, eval "
yield;
4;
", 5);
is $@, '', 'yield() does not croak';
is_deeply \@res, [ 3, 5 ], 'yield() in eval "..."';
@res = (6, sub {
yield;
7;
}->(), 8);
is_deeply \@res, [ 6, 8 ], 'yield() in sub { ... }';
@res = (9, do {
yield;
10;
}, 11);
is_deeply \@res, [ 9, 11 ], 'yield() in do { ... }';
@res = (12, (map {
yield;
13;
} qw<a b c>), 14);
is_deeply \@res, [ 12, 14 ], 'yield() in map { ... }';
my $loop;
@res = (15, do {
for (16, 17) {
$loop = $_;
yield;
my $x = 18;
}
}, 19);
is $loop, 16, 'yield() exited for';
is_deeply \@res, [ 15, 19 ], 'yield() in for () { ... }';
@res = (20, do {
$loop = 21;
while ($loop) {
yield;
$loop = 0;
my $x = 22;
}
}, 23);
is $loop, 21, 'yield() exited while';
is_deeply \@res, [ 20, 23 ], 'yield() in while () { ... }';
SKIP: {
skip '"eval { $str =~ s/./die q[foo]/e }" breaks havoc on perl 5.8 and below'
=> 1 if "$]" < 5.010;
my $s = 'a';
local $@;
eval {
$s =~ s/./yield; die 'not reached'/e;
};
my $err = $@;
my $line = __LINE__-3;
like $err,
qr/^yield\(\) can't target a substitution context at \Q$0\E line $line/,
'yield() cannot exit subst';
}
SKIP: {
skip 'perl 5.10 is required to test interaction with given/when' => 6
if "$]" < 5.010;
@res = eval <<'TESTCASE';
BEGIN {
if ("$]" >= 5.017_011) {
require warnings;
warnings->unimport('experimental::smartmatch');
}
}
use feature 'switch';
(24, do {
given (25) {
yield;
my $x = 26;
}
}, 27);
TESTCASE
diag $@ if $@;
is_deeply \@res, [ 24, 27 ], 'yield() in given { }';
# Beware that calling yield() in when() in given() sends us directly at the
# end of the enclosing given block.
@res = ();
eval <<'TESTCASE';
BEGIN {
if ("$]" >= 5.017_011) {
require warnings;
warnings->unimport('experimental::smartmatch');
}
}
use feature 'switch';
@res = (28, do {
given (29) {
when (29) {
yield;
die 'not reached 1';
}
die 'not reached 2';
}
}, 30)
TESTCASE
is $@, '', 'yield() in when { } in given did not croak';
is_deeply \@res, [ 28, 30 ], 'yield() in when { } in given';
# But calling yield() in when() in for() sends us at the next iteration.
@res = ();
eval <<'TESTCASE';
BEGIN {
if ("$]" >= 5.017_011) {
require warnings;
warnings->unimport('experimental::smartmatch');
}
}
use feature 'switch';
@res = (31, do {
for (32, 33) {
$loop = $_;
when (32) {
yield;
die 'not reached 3';
my $x = 34;
}
when (33) {
yield;
die 'not reached 4';
my $x = 35;
}
die 'not reached 5';
my $x = 36;
}
}, 37)
TESTCASE
is $@, '', 'yield() in for { } in given did not croak';
is $loop, 33, 'yield() exited for on the second iteration';
# A loop exited by last() evaluates to an empty list, but a loop that reached
# its natural end evaluates to false!
is_deeply \@res, [ 31, '', 37 ], 'yield() in when { }';
}
|
