path: root/t/op/gv.t

#!./perl

#
# various typeglob tests
#

BEGIN {
    chdir 't' if -d 't';
    @INC = '../lib';
}

use warnings;

require './test.pl';
plan( tests => 97 );

# type coersion on assignment
$foo = 'foo';
$bar = *main::foo;
$bar = $foo;
is(ref(\$bar), 'SCALAR');
$foo = *main::bar;

# type coersion (not) on misc ops

ok($foo);
is(ref(\$foo), 'GLOB');

unlike ($foo, qr/abcd/);
is(ref(\$foo), 'GLOB');

is($foo, '*main::bar');
is(ref(\$foo), 'GLOB');

# type coersion on substitutions that match
$a = *main::foo;
$b = $a;
$a =~ s/^X//;
is(ref(\$a), 'GLOB');
$a =~ s/^\*//;
is($a, 'main::foo');
is(ref(\$b), 'GLOB');

# typeglobs as lvalues
substr($foo, 0, 1) = "XXX";
is(ref(\$foo), 'SCALAR');
is($foo, 'XXXmain::bar');

# returning glob values
sub foo {
  local($bar) = *main::foo;
  $foo = *main::bar;
  return ($foo, $bar);
}

($fuu, $baa) = foo();
ok(defined $fuu);
is(ref(\$fuu), 'GLOB');


ok(defined $baa);
is(ref(\$baa), 'GLOB');

# nested package globs
# NOTE:  It's probably OK if these semantics change, because the
#        fact that %X::Y:: is stored in %X:: isn't documented.
#        (I hope.)

{ package Foo::Bar; no warnings 'once'; $test=1; }
ok(exists $Foo::{'Bar::'});
is($Foo::{'Bar::'}, '*Foo::Bar::');


# test undef operator clearing out entire glob
$foo = 'stuff';
@foo = qw(more stuff);
%foo = qw(even more random stuff);
undef *foo;
is ($foo, undef);
is (scalar @foo, 0);
is (scalar %foo, 0);

{
    # test warnings from assignment of undef to glob
    my $msg = '';
    local $SIG{__WARN__} = sub { $msg = $_[0] };
    use warnings;
    *foo = 'bar';
    is($msg, '');
    *foo = undef;
    like($msg, qr/Undefined value assigned to typeglob/);
}

my $test = curr_test();
# test *glob{THING} syntax
$x = "ok $test\n";
++$test;
@x = ("ok $test\n");
++$test;
%x = ("ok $test" => "\n");
++$test;
sub x { "ok $test\n" }
print ${*x{SCALAR}}, @{*x{ARRAY}}, %{*x{HASH}}, &{*x{CODE}};
# This needs to go here, after the print, as sub x will return the current
# value of test
++$test;
format x =
XXX This text isn't used. Should it be?
.
curr_test($test);

is (ref *x{FORMAT}, "FORMAT");
*x = *STDOUT;
is (*{*x{GLOB}}, "*main::STDOUT");

{
    my $test = curr_test();

    print {*x{IO}} "ok $test\n";
    ++$test;

    my $warn;
    local $SIG{__WARN__} = sub {
	$warn .= $_[0];
    };
    my $val = *x{FILEHANDLE};
    print {*x{IO}} ($warn =~ /is deprecated/
		    ? "ok $test\n" : "not ok $test\n");
    curr_test(++$test);
}


{
    # test if defined() doesn't create any new symbols

    my $a = "SYM000";
    ok(!defined *{$a});

    ok(!defined @{$a});
    ok(!defined *{$a});

    ok(!defined %{$a});
    ok(!defined *{$a});

    ok(!defined ${$a});
    ok(!defined *{$a});

    ok(!defined &{$a});
    ok(!defined *{$a});

    my $state = "not";
    *{$a} = sub { $state = "ok" };
    ok(defined &{$a});
    ok(defined *{$a});
    &{$a};
    is ($state, 'ok');
}

{
    # although it *should* if you're talking about magicals

    my $a = "]";
    ok(defined ${$a});
    ok(defined *{$a});

    $a = "1";
    "o" =~ /(o)/;
    ok(${$a});
    ok(defined *{$a});
    $a = "2";
    ok(!${$a});
    ok(defined *{$a});
    $a = "1x";
    ok(!defined ${$a});
    ok(!defined *{$a});
    $a = "11";
    "o" =~ /(((((((((((o)))))))))))/;
    ok(${$a});
    ok(defined *{$a});
}

# [ID 20010526.001] localized glob loses value when assigned to

$j=1; %j=(a=>1); @j=(1); local *j=*j; *j = sub{};

is($j, 1);
is($j{a}, 1);
is($j[0], 1);

{
    # does pp_readline() handle glob-ness correctly?
    my $g = *foo;
    $g = <DATA>;
    is ($g, "Perl\n");
}

{
    my $w = '';
    $SIG{__WARN__} = sub { $w = $_[0] };
    sub abc1 ();
    local *abc1 = sub { };
    is ($w, '');
    sub abc2 ();
    local *abc2;
    *abc2 = sub { };
    is ($w, '');
    sub abc3 ();
    *abc3 = sub { };
    like ($w, qr/Prototype mismatch/);
}

{
    # [17375] rcatline to formerly-defined undef was broken. Fixed in
    # do_readline by checking SvOK. AMS, 20020918
    my $x = "not ";
    $x  = undef;
    $x .= <DATA>;
    is ($x, "Rules\n");
}

{
    # test the assignment of a GLOB to an LVALUE
    my $e = '';
    local $SIG{__DIE__} = sub { $e = $_[0] };
    my $v;
    sub f { $_[0] = 0; $_[0] = "a"; $_[0] = *DATA }
    f($v);
    is ($v, '*main::DATA');
    my $x = <$v>;
    is ($x, "perl\n");
}

{
    $e = '';
    # GLOB assignment to tied element
    local $SIG{__DIE__} = sub { $e = $_[0] };
    sub T::TIEARRAY  { bless [] => "T" }
    sub T::STORE     { $_[0]->[ $_[1] ] = $_[2] }
    sub T::FETCH     { $_[0]->[ $_[1] ] }
    sub T::FETCHSIZE { @{$_[0]} }
    tie my @ary => "T";
    $ary[0] = *DATA;
    is ($ary[0], '*main::DATA');
    is ($e, '');
    my $x = readline $ary[0];
    is($x, "rocks\n");
}

{
    # Need some sort of die or warn to get the global destruction text if the
    # bug is still present
    my $output = runperl(prog => <<'EOPROG');
package M;
$| = 1;
sub DESTROY {eval {die qq{Farewell $_[0]}}; print $@}
package main;

bless \$A::B, 'M';
*A:: = \*B::;
EOPROG
    like($output, qr/^Farewell M=SCALAR/, "DESTROY was called");
    unlike($output, qr/global destruction/,
           "unreferenced symbol tables should be cleaned up immediately");
}

# Possibly not the correct test file for these tests.
# There are certain space optimisations implemented via promotion rules to
# GVs

ok(!exists $::{oonk}, "no symbols of any sort to start with");

# A string in place of the typeglob is promoted to the function prototype
$::{oonk} = "pie";
my $proto = eval 'prototype \&oonk';
die if $@;
is ($proto, "pie", "String is promoted to prototype");


# A reference to a value is used to generate a constant subroutine
foreach my $value (3, "Perl rules", \42, qr/whatever/, [1,2,3], {1=>2},
		   \*STDIN, \&ok, \undef) {
    delete $::{oonk};
    $::{oonk} = \$value;
    $proto = eval 'prototype \&oonk';
    die if $@;
    is ($proto, '', "Prototype for a constant subroutine is empty");

    my $got = eval 'oonk';
    die if $@;
    is (ref $got, ref $value, "Correct type of value");
    is ($got, $value, "Value is correctly set");
}
__END__
Perl
Rules
perl
rocks