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|
#!perl -T
use strict;
use warnings;
use Test::More tests => 4 * 3 + 1 + 3 + 7;
use lib 't/lib';
use VPIT::TestHelpers;
use Scope::Upper qw<yield leave HERE UP SUB>;
# Test timely destruction of values returned from yield()
our $destroyed;
sub guard { VPIT::TestHelpers::Guard->new(sub { ++$destroyed }) }
{
my $desc = 'scalar context, above';
local $destroyed;
{
my $obj = guard();
my $res = do {
is $destroyed, undef, "$desc: not yet destroyed 1";
yield $obj => HERE;
fail 'not reached 1';
};
is $destroyed, undef, "$desc: not yet destroyed 2";
}
is $destroyed, 1, "$desc: destroyed 1";
}
{
my $desc = 'scalar context, below';
local $destroyed;
{
my $res = do {
my $obj = guard();
is $destroyed, undef, "$desc: not yet destroyed 1";
yield $obj => HERE;
fail 'not reached 1';
};
is $destroyed, undef, "$desc: not yet destroyed 2";
}
is $destroyed, 1, "$desc: destroyed 1";
}
{
my $desc = 'void context, above';
local $destroyed;
{
my $obj = guard();
{
is $destroyed, undef, "$desc: not yet destroyed 1";
yield $obj => HERE;
fail 'not reached 1';
}
is $destroyed, undef, "$desc: not yet destroyed 2";
}
is $destroyed, 1, "$desc: destroyed 1";
}
{
my $desc = 'void context, below';
local $destroyed;
{
{
is $destroyed, undef, "$desc: not yet destroyed 1";
my $obj = guard();
yield $obj => HERE;
fail 'not reached 2';
}
is $destroyed, 1, "$desc: destroyed 1";
}
is $destroyed, 1, "$desc: destroyed 2";
}
# Test 'return from do' in special cases
{
no warnings 'void';
my @res = (1, do {
my $cxt = HERE;
my $thing = (777, do {
my @stuff = (888, do {
yield 2, 3 => $cxt;
map { my $x; $_ x 3 } qw<x y z>
}, 999);
if (@stuff) {
my $y;
++$y;
'YYY';
} else {
die 'not reached';
}
});
if (1) {
my $z;
'ZZZ';
}
'VVV'
}, 4);
is "@res", '1 2 3 4', 'yield() found the op to return to';
}
# Test leave
{
my @res = (1, do {
leave;
'XXX';
}, 2);
is "@res", '1 2', 'leave without arguments';
}
{
my @res = (1, do {
leave 2, 3;
'XXX';
}, 4);
is "@res", '1 2 3 4', 'leave with arguments';
}
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/./leave; die 'not reached'/e;
};
my $err = $@;
my $line = __LINE__-3;
like $err,
qr/^leave\(\) can't target a substitution context at \Q$0\E line $line/,
'leave() cannot exit subst';
}
{
my @destroyed;
{
package Scope::Upper::TestTimelyDestruction;
sub new {
my ($class, $label) = @_;
bless { label => $label }, $class;
}
sub label { $_[0]->{label} }
sub DESTROY {
push @destroyed, $_[0]->label;
}
}
sub SU_TTD () { 'Scope::Upper::TestTimelyDestruction' }
sub foo {
my $r = SU_TTD->new('a');
my @x = (SU_TTD->new('c'), SU_TTD->new('d'));
yield 123, $r, SU_TTD->new('b'), @x, sub { SU_TTD->new('e') }->() => UP SUB;
}
sub bar {
foo();
die 'not reached';
}
{
my $desc = sub { "yielding @_ across a sub" };
my @res = bar();
is $res[0], 123, $desc->('a constant literal');
is $res[1]->label, 'a', $desc->('a lexical');
is $res[2]->label, 'b', $desc->('a temporary object');
is $res[3]->label, 'c', $desc->('the contents of a lexical array (1)');
is $res[4]->label, 'd', $desc->('the contents of a lexical array (2)');
is $res[5]->label, 'e', $desc->('a temporary object returned by a sub');
}
is_deeply \@destroyed, [ qw<e d c b a> ],
'all these objects were properly destroyed';
}
|
