[p5sagit/p5-mst-13.2.git] / t / op / local.t

#!./perl

BEGIN {
    chdir 't' if -d 't';
    @INC = qw(. ../lib);
    require './test.pl';
}
plan tests => 122;

my $list_assignment_supported = 1;

#mg.c says list assignment not supported on VMS, EPOC, and SYMBIAN.
$list_assignment_supported = 0 if ($^O eq 'VMS');


sub foo {
    local($a, $b) = @_;
    local($c, $d);
    $c = "c 3";
    $d = "d 4";
    { local($a,$c) = ("a 9", "c 10"); ($x, $y) = ($a, $c); }
    is($a, "a 1");
    is($b, "b 2");
    $c, $d;
}

$a = "a 5";
$b = "b 6";
$c = "c 7";
$d = "d 8";

my @res;
@res =  &foo("a 1","b 2");
is($res[0], "c 3");
is($res[1], "d 4");

is($a, "a 5");
is($b, "b 6");
is($c, "c 7");
is($d, "d 8");
is($x, "a 9");
is($y, "c 10");

# same thing, only with arrays and associative arrays

sub foo2 {
    local($a, @b) = @_;
    local(@c, %d);
    @c = "c 3";
    $d{''} = "d 4";
    { local($a,@c) = ("a 19", "c 20"); ($x, $y) = ($a, @c); }
    is($a, "a 1");
    is("@b", "b 2");
    $c[0], $d{''};
}

$a = "a 5";
@b = "b 6";
@c = "c 7";
$d{''} = "d 8";

@res = &foo2("a 1","b 2");
is($res[0], "c 3");
is($res[1], "d 4");

is($a, "a 5");
is("@b", "b 6");
is($c[0], "c 7");
is($d{''}, "d 8");
is($x, "a 19");
is($y, "c 20");


eval 'local($$e)';
like($@, qr/Can't localize through a reference/);

eval '$e = []; local(@$e)';
like($@, qr/Can't localize through a reference/);

eval '$e = {}; local(%$e)';
like($@, qr/Can't localize through a reference/);

# Array and hash elements

@a = ('a', 'b', 'c');
{
    local($a[1]) = 'foo';
    local($a[2]) = $a[2];
    is($a[1], 'foo');
    is($a[2], 'c');
    undef @a;
}
is($a[1], 'b');
is($a[2], 'c');
ok(!defined $a[0]);

@a = ('a', 'b', 'c');
{
    local($a[1]) = "X";
    shift @a;
}
is($a[0].$a[1], "Xb");
{
    my $d = "@a";
    local @a = @a;
    is("@a", $d);
}

%h = ('a' => 1, 'b' => 2, 'c' => 3);
{
    local($h{'a'}) = 'foo';
    local($h{'b'}) = $h{'b'};
    is($h{'a'}, 'foo');
    is($h{'b'}, 2);
    local($h{'c'});
    delete $h{'c'};
}
is($h{'a'}, 1);
is($h{'b'}, 2);
{
    my $d = join("\n", map { "$_=>$h{$_}" } sort keys %h);
    local %h = %h;
    is(join("\n", map { "$_=>$h{$_}" } sort keys %h), $d);
}
is($h{'c'}, 3);

# check for scope leakage
$a = 'outer';
if (1) { local $a = 'inner' }
is($a, 'outer');

# see if localization works when scope unwinds
local $m = 5;
eval {
    for $m (6) {
	local $m = 7;
	die "bye";
    }
};
is($m, 5);

# see if localization works on tied arrays
{
    package TA;
    sub TIEARRAY { bless [], $_[0] }
    sub STORE { print "# STORE [@_]\n"; $_[0]->[$_[1]] = $_[2] }
    sub FETCH { my $v = $_[0]->[$_[1]]; print "# FETCH [@_=$v]\n"; $v }
    sub CLEAR { print "# CLEAR [@_]\n"; @{$_[0]} = (); }
    sub FETCHSIZE { scalar(@{$_[0]}) }
    sub SHIFT { shift (@{$_[0]}) }
    sub EXTEND {}
}

tie @a, 'TA';
@a = ('a', 'b', 'c');
{
    local($a[1]) = 'foo';
    local($a[2]) = $a[2];
    is($a[1], 'foo');
    is($a[2], 'c');
    @a = ();
}
is($a[1], 'b');
is($a[2], 'c');
ok(!defined $a[0]);
{
    my $d = "@a";
    local @a = @a;
    is("@a", $d);
}

{
    package TH;
    sub TIEHASH { bless {}, $_[0] }
    sub STORE { print "# STORE [@_]\n"; $_[0]->{$_[1]} = $_[2] }
    sub FETCH { my $v = $_[0]->{$_[1]}; print "# FETCH [@_=$v]\n"; $v }
    sub EXISTS { print "# EXISTS [@_]\n"; exists $_[0]->{$_[1]}; }
    sub DELETE { print "# DELETE [@_]\n"; delete $_[0]->{$_[1]}; }
    sub CLEAR { print "# CLEAR [@_]\n"; %{$_[0]} = (); }
    sub FIRSTKEY { print "# FIRSTKEY [@_]\n"; keys %{$_[0]}; each %{$_[0]} }
    sub NEXTKEY { print "# NEXTKEY [@_]\n"; each %{$_[0]} }
}

# see if localization works on tied hashes
tie %h, 'TH';
%h = ('a' => 1, 'b' => 2, 'c' => 3);

{
    local($h{'a'}) = 'foo';
    local($h{'b'}) = $h{'b'};
    local($h{'y'});
    local($h{'z'}) = 33;
    is($h{'a'}, 'foo');
    is($h{'b'}, 2);
    local($h{'c'});
    delete $h{'c'};
}
is($h{'a'}, 1);
is($h{'b'}, 2);
is($h{'c'}, 3);
# local() should preserve the existenceness of tied hash elements
ok(! exists $h{'y'});
ok(! exists $h{'z'});
TODO: {
    todo_skip("Localize entire tied hash");
    my $d = join("\n", map { "$_=>$h{$_}" } sort keys %h);
    local %h = %h;
    is(join("\n", map { "$_=>$h{$_}" } sort keys %h), $d);
}

@a = ('a', 'b', 'c');
{
    local($a[1]) = "X";
    shift @a;
}
is($a[0].$a[1], "Xb");

# now try the same for %SIG

$SIG{TERM} = 'foo';
$SIG{INT} = \&foo;
$SIG{__WARN__} = $SIG{INT};
{
    local($SIG{TERM}) = $SIG{TERM};
    local($SIG{INT}) = $SIG{INT};
    local($SIG{__WARN__}) = $SIG{__WARN__};
    is($SIG{TERM}, 'main::foo');
    is($SIG{INT}, \&foo);
    is($SIG{__WARN__}, \&foo);
    local($SIG{INT});
    delete $SIG{__WARN__};
}
is($SIG{TERM}, 'main::foo');
is($SIG{INT}, \&foo);
is($SIG{__WARN__}, \&foo);
{
    my $d = join("\n", map { "$_=>$SIG{$_}" } sort keys %SIG);
    local %SIG = %SIG;
    is(join("\n", map { "$_=>$SIG{$_}" } sort keys %SIG), $d);
}

# and for %ENV

$ENV{_X_} = 'a';
$ENV{_Y_} = 'b';
$ENV{_Z_} = 'c';
{
    local($ENV{_A_});
    local($ENV{_B_}) = 'foo';
    local($ENV{_X_}) = 'foo';
    local($ENV{_Y_}) = $ENV{_Y_};
    is($ENV{_X_}, 'foo');
    is($ENV{_Y_}, 'b');
    local($ENV{_Z_});
    delete $ENV{_Z_};
}
is($ENV{_X_}, 'a');
is($ENV{_Y_}, 'b');
is($ENV{_Z_}, 'c');
# local() should preserve the existenceness of %ENV elements
ok(! exists $ENV{_A_});
ok(! exists $ENV{_B_});

SKIP: {
    skip("Can't make list assignment to \%ENV on this system")
	unless $list_assignment_supported;
    my $d = join("\n", map { "$_=>$ENV{$_}" } sort keys %ENV);
    local %ENV = %ENV;
    is(join("\n", map { "$_=>$ENV{$_}" } sort keys %ENV), $d);
}

# does implicit localization in foreach skip magic?

$_ = "o 0,o 1,";
my $iter = 0;
while (/(o.+?),/gc) {
    is($1, "o $iter");
    foreach (1..1) { $iter++ }
    if ($iter > 2) { fail("endless loop"); last; }
}

{
    package UnderScore;
    sub TIESCALAR { bless \my $self, shift }
    sub FETCH { die "read  \$_ forbidden" }
    sub STORE { die "write \$_ forbidden" }
    tie $_, __PACKAGE__;
    my @tests = (
	"Nesting"     => sub { print '#'; for (1..3) { print }
			       print "\n" },			1,
	"Reading"     => sub { print },				0,
	"Matching"    => sub { $x = /badness/ },		0,
	"Concat"      => sub { $_ .= "a" },			0,
	"Chop"        => sub { chop },				0,
	"Filetest"    => sub { -x },				0,
	"Assignment"  => sub { $_ = "Bad" },			0,
	# XXX whether next one should fail is debatable
	"Local \$_"   => sub { local $_  = 'ok?'; print },	0,
	"for local"   => sub { for("#ok?\n"){ print } },	1,
    );
    while ( ($name, $code, $ok) = splice(@tests, 0, 3) ) {
	eval { &$code };
        main::ok(($ok xor $@), "Underscore '$name'");
    }
    untie $_;
}

{
    # BUG 20001205.22
    my %x;
    $x{a} = 1;
    { local $x{b} = 1; }
    ok(! exists $x{b});
    { local @x{c,d,e}; }
    ok(! exists $x{c});
}

# local() and readonly magic variables

eval { local $1 = 1 };
like($@, qr/Modification of a read-only value attempted/);

eval { for ($1) { local $_ = 1 } };
like($@, qr/Modification of a read-only value attempted/);

# make sure $1 is still read-only
eval { for ($1) { local $_ = 1 } };
like($@, qr/Modification of a read-only value attempted/);

# The s/// adds 'g' magic to $_, but it should remain non-readonly
eval { for("a") { for $x (1,2) { local $_="b"; s/(.*)/+$1/ } } };
is($@, "");

# RT #4342 Special local() behavior for $[
{
    local $[ = 1;
    ok(1 == $[, 'lexcical scope of local $[');
    f();
}

sub f { ok(0 == $[); }

# sub localisation
{
	package Other;

	sub f1 { "f1" }
	sub f2 { "f2" }

	no warnings "redefine";
	{
		local *f1 = sub  { "g1" };
		::ok(f1() eq "g1", "localised sub via glob");
	}
	::ok(f1() eq "f1", "localised sub restored");
	{
		local $Other::{"f1"} = sub { "h1" };
		::ok(f1() eq "h1", "localised sub via stash");
	}
	::ok(f1() eq "f1", "localised sub restored");
	{
		local @Other::{qw/ f1 f2 /} = (sub { "j1" }, sub { "j2" });
		::ok(f1() eq "j1", "localised sub via stash slice");
		::ok(f2() eq "j2", "localised sub via stash slice");
	}
	::ok(f1() eq "f1", "localised sub restored");
	::ok(f2() eq "f2", "localised sub restored");
}

# Localising unicode keys (bug #38815)
{
    my %h;
    $h{"\243"} = "pound";
    $h{"\302\240"} = "octects";
    is(scalar keys %h, 2);
    {
	my $unicode = chr 256;
	my $ambigous = "\240" . $unicode;
	chop $ambigous;
	local $h{$unicode} = 256;
	local $h{$ambigous} = 160;

	is(scalar keys %h, 4);
	is($h{"\243"}, "pound");
	is($h{$unicode}, 256);
	is($h{$ambigous}, 160);
	is($h{"\302\240"}, "octects");
    }
    is(scalar keys %h, 2);
    is($h{"\243"}, "pound");
    is($h{"\302\240"}, "octects");
}

# And with slices
{
    my %h;
    $h{"\243"} = "pound";
    $h{"\302\240"} = "octects";
    is(scalar keys %h, 2);
    {
	my $unicode = chr 256;
	my $ambigous = "\240" . $unicode;
	chop $ambigous;
	local @h{$unicode, $ambigous} = (256, 160);

	is(scalar keys %h, 4);
	is($h{"\243"}, "pound");
	is($h{$unicode}, 256);
	is($h{$ambigous}, 160);
	is($h{"\302\240"}, "octects");
    }
    is(scalar keys %h, 2);
    is($h{"\243"}, "pound");
    is($h{"\302\240"}, "octects");
}

# [perl #39012] localizing @_ element then shifting frees element too # soon

{
    my $x;
    my $y = bless [], 'X39012';
    sub X39012::DESTROY { $x++ }
    sub { local $_[0]; shift }->($y);
    ok(!$x,  '[perl #39012]');
    
}

# when localising a hash element, the key should be copied, not referenced

{
    my %h=('k1' => 111);
    my $k='k1';
    {
	local $h{$k}=222;

	is($h{'k1'},222);
	$k='k2';
    }
    ok(! exists($h{'k2'}));
    is($h{'k1'},111);
}
{
    my %h=('k1' => 111);
    our $k = 'k1';  # try dynamic too
    {
	local $h{$k}=222;
	is($h{'k1'},222);
	$k='k2';
    }
    ok(! exists($h{'k2'}));
    is($h{'k1'},111);
}

# Keep this test last, as it can SEGV
{
    local *@;
    pass("Localised *@");
    eval {1};
    pass("Can eval with *@ localised");
}
Commit	Line	Data
a687059c	1	#!./perl
a687059c	2
d441d3db	3	BEGIN {
d441d3db	4	chdir 't' if -d 't';
28e491ba	5	@INC = qw(. ../lib);
d441d3db	6	require './test.pl';
d441d3db	7	}
72651472	8	plan tests => 122;
a687059c	9
13414bd5	10	my $list_assignment_supported = 1;
	11
	12	#mg.c says list assignment not supported on VMS, EPOC, and SYMBIAN.
	13	$list_assignment_supported = 0 if ($^O eq 'VMS');
	14
	15
a687059c	16	sub foo {
	17	local($a, $b) = @_;
	18	local($c, $d);
d441d3db	19	$c = "c 3";
	20	$d = "d 4";
	21	{ local($a,$c) = ("a 9", "c 10"); ($x, $y) = ($a, $c); }
	22	is($a, "a 1");
	23	is($b, "b 2");
	24	$c, $d;
a687059c	25	}
a687059c	26
d441d3db	27	$a = "a 5";
	28	$b = "b 6";
	29	$c = "c 7";
	30	$d = "d 8";
a687059c	31
d441d3db	32	my @res;
	33	@res = &foo("a 1","b 2");
	34	is($res[0], "c 3");
	35	is($res[1], "d 4");
a687059c	36
d441d3db	37	is($a, "a 5");
	38	is($b, "b 6");
	39	is($c, "c 7");
	40	is($d, "d 8");
	41	is($x, "a 9");
	42	is($y, "c 10");
a687059c	43
	44	# same thing, only with arrays and associative arrays
	45
	46	sub foo2 {
	47	local($a, @b) = @_;
	48	local(@c, %d);
d441d3db	49	@c = "c 3";
	50	$d{''} = "d 4";
	51	{ local($a,@c) = ("a 19", "c 20"); ($x, $y) = ($a, @c); }
	52	is($a, "a 1");
	53	is("@b", "b 2");
	54	$c[0], $d{''};
a687059c	55	}
a687059c	56
d441d3db	57	$a = "a 5";
	58	@b = "b 6";
	59	@c = "c 7";
	60	$d{''} = "d 8";
	61
	62	@res = &foo2("a 1","b 2");
	63	is($res[0], "c 3");
	64	is($res[1], "d 4");
a687059c	65
d441d3db	66	is($a, "a 5");
	67	is("@b", "b 6");
	68	is($c[0], "c 7");
	69	is($d{''}, "d 8");
	70	is($x, "a 19");
	71	is($y, "c 20");
a687059c	72
706a304b	73
706a304b	74	eval 'local($$e)';
d441d3db	75	like($@, qr/Can't localize through a reference/);
706a304b	76
82d03984	77	eval '$e = []; local(@$e)';
d441d3db	78	like($@, qr/Can't localize through a reference/);
706a304b	79
82d03984	80	eval '$e = {}; local(%$e)';
d441d3db	81	like($@, qr/Can't localize through a reference/);
85aff577	82
161b7d16	83	# Array and hash elements
	84
	85	@a = ('a', 'b', 'c');
	86	{
	87	local($a[1]) = 'foo';
	88	local($a[2]) = $a[2];
d441d3db	89	is($a[1], 'foo');
d441d3db	90	is($a[2], 'c');
161b7d16	91	undef @a;
161b7d16	92	}
d441d3db	93	is($a[1], 'b');
	94	is($a[2], 'c');
	95	ok(!defined $a[0]);
161b7d16	96
	97	@a = ('a', 'b', 'c');
	98	{
	99	local($a[1]) = "X";
	100	shift @a;
	101	}
d441d3db	102	is($a[0].$a[1], "Xb");
d60c5a05	103	{
	104	my $d = "@a";
	105	local @a = @a;
	106	is("@a", $d);
	107	}
161b7d16	108
	109	%h = ('a' => 1, 'b' => 2, 'c' => 3);
	110	{
	111	local($h{'a'}) = 'foo';
	112	local($h{'b'}) = $h{'b'};
d441d3db	113	is($h{'a'}, 'foo');
d441d3db	114	is($h{'b'}, 2);
161b7d16	115	local($h{'c'});
	116	delete $h{'c'};
	117	}
d441d3db	118	is($h{'a'}, 1);
d441d3db	119	is($h{'b'}, 2);
d60c5a05	120	{
	121	my $d = join("\n", map { "$_=>$h{$_}" } sort keys %h);
	122	local %h = %h;
	123	is(join("\n", map { "$_=>$h{$_}" } sort keys %h), $d);
	124	}
d441d3db	125	is($h{'c'}, 3);
2bb40b7f	126
	127	# check for scope leakage
	128	$a = 'outer';
	129	if (1) { local $a = 'inner' }
d441d3db	130	is($a, 'outer');
2bb40b7f	131
	132	# see if localization works when scope unwinds
	133	local $m = 5;
	134	eval {
	135	for $m (6) {
	136	local $m = 7;
	137	die "bye";
	138	}
	139	};
d441d3db	140	is($m, 5);
4e4c362e	141
	142	# see if localization works on tied arrays
	143	{
	144	package TA;
	145	sub TIEARRAY { bless [], $_[0] }
	146	sub STORE { print "# STORE [@_]\n"; $_[0]->[$_[1]] = $_[2] }
	147	sub FETCH { my $v = $_[0]->[$_[1]]; print "# FETCH [@_=$v]\n"; $v }
	148	sub CLEAR { print "# CLEAR [@_]\n"; @{$_[0]} = (); }
	149	sub FETCHSIZE { scalar(@{$_[0]}) }
	150	sub SHIFT { shift (@{$_[0]}) }
	151	sub EXTEND {}
	152	}
	153
	154	tie @a, 'TA';
	155	@a = ('a', 'b', 'c');
	156	{
	157	local($a[1]) = 'foo';
be6c24e0	158	local($a[2]) = $a[2];
d441d3db	159	is($a[1], 'foo');
d441d3db	160	is($a[2], 'c');
4e4c362e	161	@a = ();
4e4c362e	162	}
d441d3db	163	is($a[1], 'b');
	164	is($a[2], 'c');
	165	ok(!defined $a[0]);
d60c5a05	166	{
	167	my $d = "@a";
	168	local @a = @a;
	169	is("@a", $d);
	170	}
4e4c362e	171
	172	{
	173	package TH;
	174	sub TIEHASH { bless {}, $_[0] }
	175	sub STORE { print "# STORE [@_]\n"; $_[0]->{$_[1]} = $_[2] }
	176	sub FETCH { my $v = $_[0]->{$_[1]}; print "# FETCH [@_=$v]\n"; $v }
c39e6ab0	177	sub EXISTS { print "# EXISTS [@_]\n"; exists $_[0]->{$_[1]}; }
4e4c362e	178	sub DELETE { print "# DELETE [@_]\n"; delete $_[0]->{$_[1]}; }
4e4c362e	179	sub CLEAR { print "# CLEAR [@_]\n"; %{$_[0]} = (); }
d60c5a05	180	sub FIRSTKEY { print "# FIRSTKEY [@_]\n"; keys %{$_[0]}; each %{$_[0]} }
d60c5a05	181	sub NEXTKEY { print "# NEXTKEY [@_]\n"; each %{$_[0]} }
4e4c362e	182	}
	183
	184	# see if localization works on tied hashes
	185	tie %h, 'TH';
	186	%h = ('a' => 1, 'b' => 2, 'c' => 3);
	187
	188	{
	189	local($h{'a'}) = 'foo';
be6c24e0	190	local($h{'b'}) = $h{'b'};
159ad915	191	local($h{'y'});
159ad915	192	local($h{'z'}) = 33;
d441d3db	193	is($h{'a'}, 'foo');
d441d3db	194	is($h{'b'}, 2);
4e4c362e	195	local($h{'c'});
	196	delete $h{'c'};
	197	}
d441d3db	198	is($h{'a'}, 1);
	199	is($h{'b'}, 2);
	200	is($h{'c'}, 3);
	201	# local() should preserve the existenceness of tied hash elements
	202	ok(! exists $h{'y'});
	203	ok(! exists $h{'z'});
d60c5a05	204	TODO: {
	205	todo_skip("Localize entire tied hash");
	206	my $d = join("\n", map { "$_=>$h{$_}" } sort keys %h);
	207	local %h = %h;
	208	is(join("\n", map { "$_=>$h{$_}" } sort keys %h), $d);
	209	}
4e4c362e	210
	211	@a = ('a', 'b', 'c');
	212	{
	213	local($a[1]) = "X";
	214	shift @a;
	215	}
d441d3db	216	is($a[0].$a[1], "Xb");
4e4c362e	217
be6c24e0	218	# now try the same for %SIG
	219
	220	$SIG{TERM} = 'foo';
	221	$SIG{INT} = \&foo;
	222	$SIG{__WARN__} = $SIG{INT};
	223	{
	224	local($SIG{TERM}) = $SIG{TERM};
	225	local($SIG{INT}) = $SIG{INT};
	226	local($SIG{__WARN__}) = $SIG{__WARN__};
d441d3db	227	is($SIG{TERM}, 'main::foo');
	228	is($SIG{INT}, \&foo);
	229	is($SIG{__WARN__}, \&foo);
be6c24e0	230	local($SIG{INT});
	231	delete $SIG{__WARN__};
	232	}
d441d3db	233	is($SIG{TERM}, 'main::foo');
	234	is($SIG{INT}, \&foo);
	235	is($SIG{__WARN__}, \&foo);
d60c5a05	236	{
	237	my $d = join("\n", map { "$_=>$SIG{$_}" } sort keys %SIG);
	238	local %SIG = %SIG;
	239	is(join("\n", map { "$_=>$SIG{$_}" } sort keys %SIG), $d);
	240	}
be6c24e0	241
	242	# and for %ENV
	243
	244	$ENV{_X_} = 'a';
	245	$ENV{_Y_} = 'b';
	246	$ENV{_Z_} = 'c';
	247	{
159ad915	248	local($ENV{_A_});
159ad915	249	local($ENV{_B_}) = 'foo';
be6c24e0	250	local($ENV{_X_}) = 'foo';
be6c24e0	251	local($ENV{_Y_}) = $ENV{_Y_};
d441d3db	252	is($ENV{_X_}, 'foo');
d441d3db	253	is($ENV{_Y_}, 'b');
be6c24e0	254	local($ENV{_Z_});
	255	delete $ENV{_Z_};
	256	}
d441d3db	257	is($ENV{_X_}, 'a');
	258	is($ENV{_Y_}, 'b');
	259	is($ENV{_Z_}, 'c');
	260	# local() should preserve the existenceness of %ENV elements
	261	ok(! exists $ENV{_A_});
	262	ok(! exists $ENV{_B_});
13414bd5	263
	264	SKIP: {
	265	skip("Can't make list assignment to \%ENV on this system")
	266	unless $list_assignment_supported;
d60c5a05	267	my $d = join("\n", map { "$_=>$ENV{$_}" } sort keys %ENV);
	268	local %ENV = %ENV;
	269	is(join("\n", map { "$_=>$ENV{$_}" } sort keys %ENV), $d);
	270	}
be6c24e0	271
0214ae40	272	# does implicit localization in foreach skip magic?
0214ae40	273
d441d3db	274	$_ = "o 0,o 1,";
0214ae40	275	my $iter = 0;
0214ae40	276	while (/(o.+?),/gc) {
d441d3db	277	is($1, "o $iter");
0214ae40	278	foreach (1..1) { $iter++ }
d441d3db	279	if ($iter > 2) { fail("endless loop"); last; }
0214ae40	280	}
	281
	282	{
	283	package UnderScore;
	284	sub TIESCALAR { bless \my $self, shift }
	285	sub FETCH { die "read \$_ forbidden" }
	286	sub STORE { die "write \$_ forbidden" }
	287	tie $_, __PACKAGE__;
0214ae40	288	my @tests = (
	289	"Nesting" => sub { print '#'; for (1..3) { print }
	290	print "\n" }, 1,
	291	"Reading" => sub { print }, 0,
	292	"Matching" => sub { $x = /badness/ }, 0,
	293	"Concat" => sub { $_ .= "a" }, 0,
	294	"Chop" => sub { chop }, 0,
	295	"Filetest" => sub { -x }, 0,
	296	"Assignment" => sub { $_ = "Bad" }, 0,
	297	# XXX whether next one should fail is debatable
	298	"Local \$_" => sub { local $_ = 'ok?'; print }, 0,
	299	"for local" => sub { for("#ok?\n"){ print } }, 1,
	300	);
	301	while ( ($name, $code, $ok) = splice(@tests, 0, 3) ) {
0214ae40	302	eval { &$code };
d441d3db	303	main::ok(($ok xor $@), "Underscore '$name'");
0214ae40	304	}
	305	untie $_;
	306	}
	307
1f5346dc	308	{
	309	# BUG 20001205.22
	310	my %x;
	311	$x{a} = 1;
	312	{ local $x{b} = 1; }
d441d3db	313	ok(! exists $x{b});
1f5346dc	314	{ local @x{c,d,e}; }
d441d3db	315	ok(! exists $x{c});
1f5346dc	316	}
159ad915	317
33f3c7b8	318	# local() and readonly magic variables
	319
	320	eval { local $1 = 1 };
d441d3db	321	like($@, qr/Modification of a read-only value attempted/);
33f3c7b8	322
33f3c7b8	323	eval { for ($1) { local $_ = 1 } };
d441d3db	324	like($@, qr/Modification of a read-only value attempted/);
33f3c7b8	325
0cbee0a4	326	# make sure $1 is still read-only
33f3c7b8	327	eval { for ($1) { local $_ = 1 } };
d441d3db	328	like($@, qr/Modification of a read-only value attempted/);
ac117f44	329
	330	# The s/// adds 'g' magic to $_, but it should remain non-readonly
	331	eval { for("a") { for $x (1,2) { local $_="b"; s/(.*)/+$1/ } } };
d441d3db	332	is($@, "");
4cb09e0a	333
503de470	334	# RT #4342 Special local() behavior for $[
4cb09e0a	335	{
4cb09e0a	336	local $[ = 1;
503de470	337	ok(1 == $[, 'lexcical scope of local $[');
4cb09e0a	338	f();
	339	}
	340
	341	sub f { ok(0 == $[); }
	342
985d6f61	343	# sub localisation
	344	{
	345	package Other;
	346
	347	sub f1 { "f1" }
	348	sub f2 { "f2" }
	349
	350	no warnings "redefine";
	351	{
	352	local *f1 = sub { "g1" };
	353	::ok(f1() eq "g1", "localised sub via glob");
	354	}
	355	::ok(f1() eq "f1", "localised sub restored");
	356	{
	357	local $Other::{"f1"} = sub { "h1" };
	358	::ok(f1() eq "h1", "localised sub via stash");
	359	}
	360	::ok(f1() eq "f1", "localised sub restored");
	361	{
	362	local @Other::{qw/ f1 f2 /} = (sub { "j1" }, sub { "j2" });
985d6f61	363	::ok(f1() eq "j1", "localised sub via stash slice");
985d6f61	364	::ok(f2() eq "j2", "localised sub via stash slice");
985d6f61	365	}
	366	::ok(f1() eq "f1", "localised sub restored");
	367	::ok(f2() eq "f2", "localised sub restored");
	368	}
7d654f43	369
	370	# Localising unicode keys (bug #38815)
	371	{
	372	my %h;
	373	$h{"\243"} = "pound";
	374	$h{"\302\240"} = "octects";
	375	is(scalar keys %h, 2);
	376	{
	377	my $unicode = chr 256;
	378	my $ambigous = "\240" . $unicode;
	379	chop $ambigous;
	380	local $h{$unicode} = 256;
	381	local $h{$ambigous} = 160;
	382
	383	is(scalar keys %h, 4);
	384	is($h{"\243"}, "pound");
	385	is($h{$unicode}, 256);
	386	is($h{$ambigous}, 160);
	387	is($h{"\302\240"}, "octects");
	388	}
	389	is(scalar keys %h, 2);
	390	is($h{"\243"}, "pound");
	391	is($h{"\302\240"}, "octects");
	392	}
919acde0	393
	394	# And with slices
	395	{
	396	my %h;
	397	$h{"\243"} = "pound";
	398	$h{"\302\240"} = "octects";
	399	is(scalar keys %h, 2);
	400	{
	401	my $unicode = chr 256;
	402	my $ambigous = "\240" . $unicode;
	403	chop $ambigous;
	404	local @h{$unicode, $ambigous} = (256, 160);
	405
	406	is(scalar keys %h, 4);
	407	is($h{"\243"}, "pound");
	408	is($h{$unicode}, 256);
	409	is($h{$ambigous}, 160);
	410	is($h{"\302\240"}, "octects");
	411	}
	412	is(scalar keys %h, 2);
	413	is($h{"\243"}, "pound");
	414	is($h{"\302\240"}, "octects");
	415	}
658aef79	416
	417	# [perl #39012] localizing @_ element then shifting frees element too # soon
	418
	419	{
	420	my $x;
	421	my $y = bless [], 'X39012';
	422	sub X39012::DESTROY { $x++ }
	423	sub { local $_[0]; shift }->($y);
	424	ok(!$x, '[perl #39012]');
	425
	426	}
	427
b2096149	428	# when localising a hash element, the key should be copied, not referenced
	429
	430	{
	431	my %h=('k1' => 111);
	432	my $k='k1';
	433	{
	434	local $h{$k}=222;
	435
	436	is($h{'k1'},222);
	437	$k='k2';
	438	}
	439	ok(! exists($h{'k2'}));
	440	is($h{'k1'},111);
	441	}
46c458a0	442	{
	443	my %h=('k1' => 111);
	444	our $k = 'k1'; # try dynamic too
	445	{
	446	local $h{$k}=222;
	447	is($h{'k1'},222);
	448	$k='k2';
	449	}
	450	ok(! exists($h{'k2'}));
	451	is($h{'k1'},111);
	452	}
72651472	453
	454	# Keep this test last, as it can SEGV
	455	{
	456	local *@;
	457	pass("Localised *@");
	458	eval {1};
	459	pass("Can eval with *@ localised");
	460	}
	461