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use v6;
use Test;
plan 12;
# L<S04/Phasers/KEEP "at every successful block exit">
# L<S04/Phasers/UNDO "at every unsuccessful block exit">
{
my $str;
my sub is_pos ($n) {
return (($n > 0) ?? 1 !! Mu);
KEEP { $str ~= "$n > 0 " }
UNDO { $str ~= "$n <= 0 " }
}
ok is_pos(1), 'is_pos worked for 1';
is $str, '1 > 0 ', 'KEEP ran as expected';
ok !is_pos(0), 'is_pos worked for 0';
is $str, '1 > 0 0 <= 0 ', 'UNDO worked as expected';
ok !is_pos(-1), 'is_pos worked for 0';
is $str, '1 > 0 0 <= 0 -1 <= 0 ', 'UNDO worked as expected';
}
# L<S04/Phasers/This includes the LEAVE variants, KEEP and UNDO.>
{
my $str;
my sub is_pos($n) {
return (($n > 0) ?? 1 !! Mu);
LEAVE { $str ~= ")" }
KEEP { $str ~= "$n > 0" }
UNDO { $str ~= "$n <= 0" }
LEAVE { $str ~= "(" }
}
is_pos(1);
is $str, '(1 > 0)', 'KEEP triggered as part of LEAVE blocks';
is_pos(-5);
is $str, '(1 > 0)(-5 <= 0)', 'UNDO triggered as part of LEAVE blocks';
}
# L<S04/Phasers/"can occur multiple times">
# multiple KEEP/UNDO
{
my $str;
{
KEEP { $str ~= 'K1 ' }
KEEP { $str ~= 'K2 ' }
UNDO { $str ~= 'U1 ' }
UNDO { $str ~= 'U2 ' }
1;
}
is $str, 'K2 K1 ', '2 KEEP blocks triggered';
}
{
my $str;
{
KEEP { $str ~= 'K1 ' }
KEEP { $str ~= 'K2 ' }
UNDO { $str ~= 'U1 ' }
UNDO { $str ~= 'U2 ' }
}
is $str, 'U2 U1 ', '2 UNDO blocks triggered';
}
#?niecza skip "fail NYI"
{
my $kept = 0;
my $undone = 0;
sub f() {
KEEP $kept = 1;
UNDO $undone = 1;
fail 'foo';
}
my $sink = f; #OK
nok $kept, 'fail() does not trigger KEEP';
ok $undone, 'fail() triggers UNDO';
}
# vim: ft=perl6
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