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#!./perl -w
#
# Verify which OP= operators warn if their targets are undefined.
# Based on redef.t, contributed by Graham Barr <Graham.Barr@tiuk.ti.com>
# -- Robin Barker
#
# Now almost completely rewritten.
BEGIN {
chdir 't' if -d 't';
@INC = '../lib';
require './test.pl';
}
use strict;
my (%should_warn, %should_not);
++$should_warn{$_} foreach qw(* / x & ** << >>);
++$should_not{$_} foreach qw(+ - . | ^ && ||);
my %integer;
$integer{$_} = 0 foreach qw(* / % + -);
sub TIESCALAR { my $x; bless \$x }
sub FETCH { ${$_[0]} }
sub STORE { ${$_[0]} = $_[1] }
sub test_op {
my ($tie, $int, $op_seq, $warn) = @_;
my $code = "sub {\n";
$code .= "use integer;" if $int;
$code .= "my \$x;\n";
$code .= "tie \$x, 'main';\n" if $tie;
$code .= "$op_seq;\n}\n";
my $sub = eval $code;
is($@, '', "Can eval code for $op_seq");
if ($warn) {
warning_like($sub, qr/^Use of uninitialized value/,
"$op_seq$tie$int warns");
} else {
warning_is($sub, undef, "$op_seq$tie$int does not warn");
}
}
# go through all tests once normally and once with tied $x
for my $tie ("", ", tied") {
foreach my $integer ('', ', int') {
test_op($tie, $integer, $_, 0) foreach qw($x++ $x-- ++$x --$x);
}
foreach (keys %should_warn, keys %should_not) {
test_op($tie, '', "\$x $_= 1", $should_warn{$_});
next unless exists $integer{$_};
test_op($tie, ', int', "\$x $_= 1", $should_warn{$_});
}
foreach (qw(| ^ &)) {
test_op($tie, '', "\$x $_= 'x'", $should_warn{$_});
}
}
done_testing();
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