use v6;

use Test;

#Ternary operator ?? !!

plan 17;
#L<S03/Changes to Perl 5 operators/"The ? : conditional operator becomes ?? !!">

my $str1 = "aaa";
my $str2 = "aaa";
my $str3 = "bbb";

{
    my $foo = "";
    $str1 eq $str2 ?? ($foo = 1) !! ($foo = 2);
    is($foo, 1, "?? !!");

    $str1 eq $str3 ?? ($foo = 3) !! ($foo = 4);
    is($foo, 4, "?? !!");
}

is(($str2 eq $str1 ?? 8 * 8 !! 9 * 9), 64, "?? !! in parenthesis");
is(($str2 eq $str3 ?? 8 + 8 !! 9 div 9), 1, "?? !! in parenthesis");

is(1 ?? 2 ?? 3 !! 4 !! 5 ?? 6 !! 7, 3, "nested ?? !!");
is(1 ?? 0 ?? 3 !! 4 !! 5 ?? 6 !! 7, 4, "nested ?? !!");
is(0 ?? 2 ?? 3 !! 4 !! 5 ?? 6 !! 7, 6, "nested ?? !!");
is(0 ?? 2 ?? 3 !! 4 !! 0 ?? 6 !! 7, 7, "nested ?? !!");

{
    my @a = (1 ?? 2 !! 3, 4 ?? 5 !! 6);
    is(@a, [2, 5], "?? !! in array");

}

is((0 and 1 ?? 2 !! 3), 0, "operator priority");
is((4 or 5 ?? 6 !! 7), 4, "operator priority");

{
    my $foo = 8;

    $foo = 9 ?? 10 !! 11;
    is($foo, 10, "operator priority");

    $foo = 0 ?? 12 !! 13;
    is($foo, 13, "operator priority");
}

#?pugs skip "parse failure"
{
    # This parses incorrectly in pugs because it's 
    # parsed as Bool::True(!! Bool::False).
    my $foo = 1 ?? Bool::True !! Bool::False;
    is($foo, Bool::True, "a statement with both ??!! and :: in it did compile") ;
}

{
    # Defining an N! postfix (for factorial) causes a misparse on ternary op
    proto postfix:<!>($n) {
        return 1 if $n < 2;
        return $n * ($n-1)!
    }

    my $foo = eval q[ 1 ?? 'yay' !! 'nay' ];
    #?pugs todo 'bug'
    is($foo, "yay", "defining a postfix<!> doesn't screw up ternary op");
}

eval_dies_ok q[ 1 ?? 2,3 !! 4,5 ], 'Ternary error (RT 66840)';

eval_dies_ok q[ 71704 !! 'bust' ], 'Ternary error (RT 71704)';

done_testing;

# vim: ft=perl6