[perl5.git] / t / op / local.t

#!./perl

BEGIN {
    chdir 't' if -d 't';
    @INC = qw(. ../lib);
    require './test.pl';
}
plan tests => 183;

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[4]) = 'x';
    ok(!defined $a[3]);
    is($a[4], 'x');
}
is(scalar(@a), 3);
ok(!exists $a[3]);
ok(!exists $a[4]);

@a = ('a', 'b', 'c');
{
    local($a[5]) = 'z';
    $a[4] = 'y';
    ok(!defined $a[3]);
    is($a[4], 'y');
    is($a[5], 'z');
}
is(scalar(@a), 5);
ok(!defined $a[3]);
is($a[4], 'y');
ok(!exists $a[5]);

@a = ('a', 'b', 'c');
{
    local(@a[4,6]) = ('x', 'z');
    ok(!defined $a[3]);
    is($a[4], 'x');
    ok(!defined $a[5]);
    is($a[6], 'z');
}
is(scalar(@a), 3);
ok(!exists $a[3]);
ok(!exists $a[4]);
ok(!exists $a[5]);
ok(!exists $a[6]);

@a = ('a', 'b', 'c');
{
    local(@a[4,6]) = ('x', 'z');
    $a[5] = 'y';
    ok(!defined $a[3]);
    is($a[4], 'x');
    is($a[5], 'y');
    is($a[6], 'z');
}
is(scalar(@a), 6);
ok(!defined $a[3]);
ok(!defined $a[4]);
is($a[5], 'y');
ok(!exists $a[6]);

@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 EXISTS { print "# EXISTS [@_]\n"; exists $_[0]->[$_[1]]; }
    sub DELETE { print "# DELETE [@_]\n"; delete $_[0]->[$_[1]]; }
    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);
}

# local() should preserve the existenceness of tied array elements
@a = ('a', 'b', 'c');
{
    local($a[4]) = 'x';
    ok(!defined $a[3]);
    is($a[4], 'x');
}
is(scalar(@a), 3);
ok(!exists $a[3]);
ok(!exists $a[4]);

@a = ('a', 'b', 'c');
{
    local($a[5]) = 'z';
    $a[4] = 'y';
    ok(!defined $a[3]);
    is($a[4], 'y');
    is($a[5], 'z');
}
is(scalar(@a), 5);
ok(!defined $a[3]);
is($a[4], 'y');
ok(!exists $a[5]);

@a = ('a', 'b', 'c');
{
    local(@a[4,6]) = ('x', 'z');
    ok(!defined $a[3]);
    is($a[4], 'x');
    ok(!defined $a[5]);
    is($a[6], 'z');
}
is(scalar(@a), 3);
ok(!exists $a[3]);
ok(!exists $a[4]);
ok(!exists $a[5]);
ok(!exists $a[6]);

@a = ('a', 'b', 'c');
{
    local(@a[4,6]) = ('x', 'z');
    $a[5] = 'y';
    ok(!defined $a[3]);
    is($a[4], 'x');
    is($a[5], 'y');
    is($a[6], 'z');
}
is(scalar(@a), 6);
ok(!defined $a[3]);
ok(!defined $a[4]);
is($a[5], 'y');
ok(!exists $a[6]);

# see if localization works on tied hashes
{
    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]} }
}

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);
}

like( runperl(stderr => 1,
              prog => 'use constant foo => q(a);' .
                      'index(q(a), foo);' .
                      'local *g=${::}{foo};print q(ok);'), "ok", "[perl #52740]");

# Keep this test last, as it can SEGV
{
    local *@;
    pass("Localised *@");
    eval {1};
    pass("Can eval with *@ localised");
}
Commit	Line	Data
a687059c LW	1	#!./perl
a687059c LW	2
d441d3db RD	3	BEGIN {
d441d3db RD	4	chdir 't' if -d 't';
28e491ba	5	@INC = qw(. ../lib);
d441d3db RD	6	require './test.pl';
d441d3db RD	7	}
4ad10a0b	8	plan tests => 183;
a687059c	9
13414bd5 JM	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 LW	16	sub foo {
	17	local($a, $b) = @_;
	18	local($c, $d);
d441d3db RD	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 LW	25	}
a687059c LW	26
d441d3db RD	27	$a = "a 5";
	28	$b = "b 6";
	29	$c = "c 7";
	30	$d = "d 8";
a687059c	31
d441d3db RD	32	my @res;
	33	@res = &foo("a 1","b 2");
	34	is($res[0], "c 3");
	35	is($res[1], "d 4");
a687059c	36
d441d3db RD	37	is($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($y, "c 10");
a687059c LW	43
	44	# same thing, only with arrays and associative arrays
	45
	46	sub foo2 {
	47	local($a, @b) = @_;
	48	local(@c, %d);
d441d3db RD	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 LW	55	}
a687059c LW	56
d441d3db RD	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($res[1], "d 4");
a687059c	65
d441d3db RD	66	is($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 SM	73
706a304b SM	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($@, qr/Can't localize through a reference/);
85aff577	82
161b7d16 SM	83	# Array and hash elements
	84
	85	@a = ('a', 'b', 'c');
	86	{
	87	local($a[1]) = 'foo';
	88	local($a[2]) = $a[2];
d441d3db RD	89	is($a[1], 'foo');
d441d3db RD	90	is($a[2], 'c');
161b7d16 SM	91	undef @a;
161b7d16 SM	92	}
d441d3db RD	93	is($a[1], 'b');
	94	is($a[2], 'c');
	95	ok(!defined $a[0]);
161b7d16 SM	96
	97	@a = ('a', 'b', 'c');
	98	{
4ad10a0b VP	99	local($a[4]) = 'x';
	100	ok(!defined $a[3]);
	101	is($a[4], 'x');
	102	}
	103	is(scalar(@a), 3);
	104	ok(!exists $a[3]);
	105	ok(!exists $a[4]);
	106
	107	@a = ('a', 'b', 'c');
	108	{
	109	local($a[5]) = 'z';
	110	$a[4] = 'y';
	111	ok(!defined $a[3]);
	112	is($a[4], 'y');
	113	is($a[5], 'z');
	114	}
	115	is(scalar(@a), 5);
	116	ok(!defined $a[3]);
	117	is($a[4], 'y');
	118	ok(!exists $a[5]);
	119
	120	@a = ('a', 'b', 'c');
	121	{
	122	local(@a[4,6]) = ('x', 'z');
	123	ok(!defined $a[3]);
	124	is($a[4], 'x');
	125	ok(!defined $a[5]);
	126	is($a[6], 'z');
	127	}
	128	is(scalar(@a), 3);
	129	ok(!exists $a[3]);
	130	ok(!exists $a[4]);
	131	ok(!exists $a[5]);
	132	ok(!exists $a[6]);
	133
	134	@a = ('a', 'b', 'c');
	135	{
	136	local(@a[4,6]) = ('x', 'z');
	137	$a[5] = 'y';
	138	ok(!defined $a[3]);
	139	is($a[4], 'x');
	140	is($a[5], 'y');
	141	is($a[6], 'z');
	142	}
	143	is(scalar(@a), 6);
	144	ok(!defined $a[3]);
	145	ok(!defined $a[4]);
	146	is($a[5], 'y');
	147	ok(!exists $a[6]);
	148
	149	@a = ('a', 'b', 'c');
	150	{
161b7d16 SM	151	local($a[1]) = "X";
	152	shift @a;
	153	}
d441d3db	154	is($a[0].$a[1], "Xb");
d60c5a05 RD	155	{
	156	my $d = "@a";
	157	local @a = @a;
	158	is("@a", $d);
	159	}
161b7d16 SM	160
	161	%h = ('a' => 1, 'b' => 2, 'c' => 3);
	162	{
	163	local($h{'a'}) = 'foo';
	164	local($h{'b'}) = $h{'b'};
d441d3db RD	165	is($h{'a'}, 'foo');
d441d3db RD	166	is($h{'b'}, 2);
161b7d16 SM	167	local($h{'c'});
	168	delete $h{'c'};
	169	}
d441d3db RD	170	is($h{'a'}, 1);
d441d3db RD	171	is($h{'b'}, 2);
d60c5a05 RD	172	{
	173	my $d = join("\n", map { "$_=>$h{$_}" } sort keys %h);
	174	local %h = %h;
	175	is(join("\n", map { "$_=>$h{$_}" } sort keys %h), $d);
	176	}
d441d3db	177	is($h{'c'}, 3);
2bb40b7f GS	178
	179	# check for scope leakage
	180	$a = 'outer';
	181	if (1) { local $a = 'inner' }
d441d3db	182	is($a, 'outer');
2bb40b7f GS	183
	184	# see if localization works when scope unwinds
	185	local $m = 5;
	186	eval {
	187	for $m (6) {
	188	local $m = 7;
	189	die "bye";
	190	}
	191	};
d441d3db	192	is($m, 5);
4e4c362e GS	193
	194	# see if localization works on tied arrays
	195	{
	196	package TA;
	197	sub TIEARRAY { bless [], $_[0] }
	198	sub STORE { print "# STORE [@_]\n"; $_[0]->[$_[1]] = $_[2] }
	199	sub FETCH { my $v = $_[0]->[$_[1]]; print "# FETCH [@_=$v]\n"; $v }
4ad10a0b VP	200	sub EXISTS { print "# EXISTS [@_]\n"; exists $_[0]->[$_[1]]; }
4ad10a0b VP	201	sub DELETE { print "# DELETE [@_]\n"; delete $_[0]->[$_[1]]; }
4e4c362e GS	202	sub CLEAR { print "# CLEAR [@_]\n"; @{$_[0]} = (); }
	203	sub FETCHSIZE { scalar(@{$_[0]}) }
	204	sub SHIFT { shift (@{$_[0]}) }
	205	sub EXTEND {}
	206	}
	207
	208	tie @a, 'TA';
	209	@a = ('a', 'b', 'c');
	210	{
	211	local($a[1]) = 'foo';
be6c24e0	212	local($a[2]) = $a[2];
d441d3db RD	213	is($a[1], 'foo');
d441d3db RD	214	is($a[2], 'c');
4e4c362e GS	215	@a = ();
4e4c362e GS	216	}
d441d3db RD	217	is($a[1], 'b');
	218	is($a[2], 'c');
	219	ok(!defined $a[0]);
d60c5a05 RD	220	{
	221	my $d = "@a";
	222	local @a = @a;
	223	is("@a", $d);
	224	}
4e4c362e	225
4ad10a0b VP	226	# local() should preserve the existenceness of tied array elements
	227	@a = ('a', 'b', 'c');
	228	{
	229	local($a[4]) = 'x';
	230	ok(!defined $a[3]);
	231	is($a[4], 'x');
	232	}
	233	is(scalar(@a), 3);
	234	ok(!exists $a[3]);
	235	ok(!exists $a[4]);
	236
	237	@a = ('a', 'b', 'c');
	238	{
	239	local($a[5]) = 'z';
	240	$a[4] = 'y';
	241	ok(!defined $a[3]);
	242	is($a[4], 'y');
	243	is($a[5], 'z');
	244	}
	245	is(scalar(@a), 5);
	246	ok(!defined $a[3]);
	247	is($a[4], 'y');
	248	ok(!exists $a[5]);
	249
	250	@a = ('a', 'b', 'c');
	251	{
	252	local(@a[4,6]) = ('x', 'z');
	253	ok(!defined $a[3]);
	254	is($a[4], 'x');
	255	ok(!defined $a[5]);
	256	is($a[6], 'z');
	257	}
	258	is(scalar(@a), 3);
	259	ok(!exists $a[3]);
	260	ok(!exists $a[4]);
	261	ok(!exists $a[5]);
	262	ok(!exists $a[6]);
	263
	264	@a = ('a', 'b', 'c');
	265	{
	266	local(@a[4,6]) = ('x', 'z');
	267	$a[5] = 'y';
	268	ok(!defined $a[3]);
	269	is($a[4], 'x');
	270	is($a[5], 'y');
	271	is($a[6], 'z');
	272	}
	273	is(scalar(@a), 6);
	274	ok(!defined $a[3]);
	275	ok(!defined $a[4]);
	276	is($a[5], 'y');
	277	ok(!exists $a[6]);
	278
	279	# see if localization works on tied hashes
4e4c362e GS	280	{
	281	package TH;
	282	sub TIEHASH { bless {}, $_[0] }
	283	sub STORE { print "# STORE [@_]\n"; $_[0]->{$_[1]} = $_[2] }
	284	sub FETCH { my $v = $_[0]->{$_[1]}; print "# FETCH [@_=$v]\n"; $v }
c39e6ab0	285	sub EXISTS { print "# EXISTS [@_]\n"; exists $_[0]->{$_[1]}; }
4e4c362e GS	286	sub DELETE { print "# DELETE [@_]\n"; delete $_[0]->{$_[1]}; }
4e4c362e GS	287	sub CLEAR { print "# CLEAR [@_]\n"; %{$_[0]} = (); }
d60c5a05 RD	288	sub FIRSTKEY { print "# FIRSTKEY [@_]\n"; keys %{$_[0]}; each %{$_[0]} }
d60c5a05 RD	289	sub NEXTKEY { print "# NEXTKEY [@_]\n"; each %{$_[0]} }
4e4c362e GS	290	}
4e4c362e GS	291
4e4c362e GS	292	tie %h, 'TH';
	293	%h = ('a' => 1, 'b' => 2, 'c' => 3);
	294
	295	{
	296	local($h{'a'}) = 'foo';
be6c24e0	297	local($h{'b'}) = $h{'b'};
159ad915 DM	298	local($h{'y'});
159ad915 DM	299	local($h{'z'}) = 33;
d441d3db RD	300	is($h{'a'}, 'foo');
d441d3db RD	301	is($h{'b'}, 2);
4e4c362e GS	302	local($h{'c'});
	303	delete $h{'c'};
	304	}
d441d3db RD	305	is($h{'a'}, 1);
	306	is($h{'b'}, 2);
	307	is($h{'c'}, 3);
	308	# local() should preserve the existenceness of tied hash elements
	309	ok(! exists $h{'y'});
	310	ok(! exists $h{'z'});
d60c5a05 RD	311	TODO: {
	312	todo_skip("Localize entire tied hash");
	313	my $d = join("\n", map { "$_=>$h{$_}" } sort keys %h);
	314	local %h = %h;
	315	is(join("\n", map { "$_=>$h{$_}" } sort keys %h), $d);
	316	}
4e4c362e GS	317
	318	@a = ('a', 'b', 'c');
	319	{
	320	local($a[1]) = "X";
	321	shift @a;
	322	}
d441d3db	323	is($a[0].$a[1], "Xb");
4e4c362e	324
be6c24e0 GS	325	# now try the same for %SIG
	326
	327	$SIG{TERM} = 'foo';
	328	$SIG{INT} = \&foo;
	329	$SIG{__WARN__} = $SIG{INT};
	330	{
	331	local($SIG{TERM}) = $SIG{TERM};
	332	local($SIG{INT}) = $SIG{INT};
	333	local($SIG{__WARN__}) = $SIG{__WARN__};
d441d3db RD	334	is($SIG{TERM}, 'main::foo');
	335	is($SIG{INT}, \&foo);
	336	is($SIG{__WARN__}, \&foo);
be6c24e0 GS	337	local($SIG{INT});
	338	delete $SIG{__WARN__};
	339	}
d441d3db RD	340	is($SIG{TERM}, 'main::foo');
	341	is($SIG{INT}, \&foo);
	342	is($SIG{__WARN__}, \&foo);
d60c5a05 RD	343	{
	344	my $d = join("\n", map { "$_=>$SIG{$_}" } sort keys %SIG);
	345	local %SIG = %SIG;
	346	is(join("\n", map { "$_=>$SIG{$_}" } sort keys %SIG), $d);
	347	}
be6c24e0 GS	348
	349	# and for %ENV
	350
	351	$ENV{_X_} = 'a';
	352	$ENV{_Y_} = 'b';
	353	$ENV{_Z_} = 'c';
	354	{
159ad915 DM	355	local($ENV{_A_});
159ad915 DM	356	local($ENV{_B_}) = 'foo';
be6c24e0 GS	357	local($ENV{_X_}) = 'foo';
be6c24e0 GS	358	local($ENV{_Y_}) = $ENV{_Y_};
d441d3db RD	359	is($ENV{_X_}, 'foo');
d441d3db RD	360	is($ENV{_Y_}, 'b');
be6c24e0 GS	361	local($ENV{_Z_});
	362	delete $ENV{_Z_};
	363	}
d441d3db RD	364	is($ENV{_X_}, 'a');
	365	is($ENV{_Y_}, 'b');
	366	is($ENV{_Z_}, 'c');
	367	# local() should preserve the existenceness of %ENV elements
	368	ok(! exists $ENV{_A_});
	369	ok(! exists $ENV{_B_});
13414bd5 JM	370
	371	SKIP: {
	372	skip("Can't make list assignment to \%ENV on this system")
	373	unless $list_assignment_supported;
d60c5a05 RD	374	my $d = join("\n", map { "$_=>$ENV{$_}" } sort keys %ENV);
	375	local %ENV = %ENV;
	376	is(join("\n", map { "$_=>$ENV{$_}" } sort keys %ENV), $d);
	377	}
be6c24e0	378
0214ae40 GS	379	# does implicit localization in foreach skip magic?
0214ae40 GS	380
d441d3db	381	$_ = "o 0,o 1,";
0214ae40 GS	382	my $iter = 0;
0214ae40 GS	383	while (/(o.+?),/gc) {
d441d3db	384	is($1, "o $iter");
0214ae40	385	foreach (1..1) { $iter++ }
d441d3db	386	if ($iter > 2) { fail("endless loop"); last; }
0214ae40 GS	387	}
	388
	389	{
	390	package UnderScore;
	391	sub TIESCALAR { bless \my $self, shift }
	392	sub FETCH { die "read \$_ forbidden" }
	393	sub STORE { die "write \$_ forbidden" }
	394	tie $_, __PACKAGE__;
0214ae40 GS	395	my @tests = (
	396	"Nesting" => sub { print '#'; for (1..3) { print }
	397	print "\n" }, 1,
	398	"Reading" => sub { print }, 0,
	399	"Matching" => sub { $x = /badness/ }, 0,
	400	"Concat" => sub { $_ .= "a" }, 0,
	401	"Chop" => sub { chop }, 0,
	402	"Filetest" => sub { -x }, 0,
	403	"Assignment" => sub { $_ = "Bad" }, 0,
	404	# XXX whether next one should fail is debatable
	405	"Local \$_" => sub { local $_ = 'ok?'; print }, 0,
	406	"for local" => sub { for("#ok?\n"){ print } }, 1,
	407	);
	408	while ( ($name, $code, $ok) = splice(@tests, 0, 3) ) {
0214ae40	409	eval { &$code };
d441d3db	410	main::ok(($ok xor $@), "Underscore '$name'");
0214ae40 GS	411	}
	412	untie $_;
	413	}
	414
1f5346dc SC	415	{
	416	# BUG 20001205.22
	417	my %x;
	418	$x{a} = 1;
	419	{ local $x{b} = 1; }
d441d3db	420	ok(! exists $x{b});
1f5346dc	421	{ local @x{c,d,e}; }
d441d3db	422	ok(! exists $x{c});
1f5346dc	423	}
159ad915	424
33f3c7b8 RGS	425	# local() and readonly magic variables
	426
	427	eval { local $1 = 1 };
d441d3db	428	like($@, qr/Modification of a read-only value attempted/);
33f3c7b8 RGS	429
33f3c7b8 RGS	430	eval { for ($1) { local $_ = 1 } };
d441d3db	431	like($@, qr/Modification of a read-only value attempted/);
33f3c7b8	432
0cbee0a4	433	# make sure $1 is still read-only
33f3c7b8	434	eval { for ($1) { local $_ = 1 } };
d441d3db	435	like($@, qr/Modification of a read-only value attempted/);
ac117f44 RGS	436
	437	# The s/// adds 'g' magic to $_, but it should remain non-readonly
	438	eval { for("a") { for $x (1,2) { local $_="b"; s/(.*)/+$1/ } } };
d441d3db	439	is($@, "");
4cb09e0a	440
503de470	441	# RT #4342 Special local() behavior for $[
4cb09e0a SP	442	{
4cb09e0a SP	443	local $[ = 1;
503de470	444	ok(1 == $[, 'lexcical scope of local $[');
4cb09e0a SP	445	f();
	446	}
	447
	448	sub f { ok(0 == $[); }
	449
985d6f61 HS	450	# sub localisation
	451	{
	452	package Other;
	453
	454	sub f1 { "f1" }
	455	sub f2 { "f2" }
	456
	457	no warnings "redefine";
	458	{
	459	local *f1 = sub { "g1" };
	460	::ok(f1() eq "g1", "localised sub via glob");
	461	}
	462	::ok(f1() eq "f1", "localised sub restored");
	463	{
	464	local $Other::{"f1"} = sub { "h1" };
	465	::ok(f1() eq "h1", "localised sub via stash");
	466	}
	467	::ok(f1() eq "f1", "localised sub restored");
	468	{
	469	local @Other::{qw/ f1 f2 /} = (sub { "j1" }, sub { "j2" });
985d6f61 HS	470	::ok(f1() eq "j1", "localised sub via stash slice");
985d6f61 HS	471	::ok(f2() eq "j2", "localised sub via stash slice");
985d6f61 HS	472	}
	473	::ok(f1() eq "f1", "localised sub restored");
	474	::ok(f2() eq "f2", "localised sub restored");
	475	}
7d654f43 NC	476
	477	# Localising unicode keys (bug #38815)
	478	{
	479	my %h;
	480	$h{"\243"} = "pound";
	481	$h{"\302\240"} = "octects";
	482	is(scalar keys %h, 2);
	483	{
	484	my $unicode = chr 256;
	485	my $ambigous = "\240" . $unicode;
	486	chop $ambigous;
	487	local $h{$unicode} = 256;
	488	local $h{$ambigous} = 160;
	489
	490	is(scalar keys %h, 4);
	491	is($h{"\243"}, "pound");
	492	is($h{$unicode}, 256);
	493	is($h{$ambigous}, 160);
	494	is($h{"\302\240"}, "octects");
	495	}
	496	is(scalar keys %h, 2);
	497	is($h{"\243"}, "pound");
	498	is($h{"\302\240"}, "octects");
	499	}
919acde0 NC	500
	501	# And with slices
	502	{
	503	my %h;
	504	$h{"\243"} = "pound";
	505	$h{"\302\240"} = "octects";
	506	is(scalar keys %h, 2);
	507	{
	508	my $unicode = chr 256;
	509	my $ambigous = "\240" . $unicode;
	510	chop $ambigous;
	511	local @h{$unicode, $ambigous} = (256, 160);
	512
	513	is(scalar keys %h, 4);
	514	is($h{"\243"}, "pound");
	515	is($h{$unicode}, 256);
	516	is($h{$ambigous}, 160);
	517	is($h{"\302\240"}, "octects");
	518	}
	519	is(scalar keys %h, 2);
	520	is($h{"\243"}, "pound");
	521	is($h{"\302\240"}, "octects");
	522	}
658aef79 DM	523
	524	# [perl #39012] localizing @_ element then shifting frees element too # soon
	525
	526	{
	527	my $x;
	528	my $y = bless [], 'X39012';
	529	sub X39012::DESTROY { $x++ }
	530	sub { local $_[0]; shift }->($y);
	531	ok(!$x, '[perl #39012]');
	532
	533	}
	534
b2096149 BL	535	# when localising a hash element, the key should be copied, not referenced
	536
	537	{
	538	my %h=('k1' => 111);
	539	my $k='k1';
	540	{
	541	local $h{$k}=222;
	542
	543	is($h{'k1'},222);
	544	$k='k2';
	545	}
	546	ok(! exists($h{'k2'}));
	547	is($h{'k1'},111);
	548	}
46c458a0 HS	549	{
	550	my %h=('k1' => 111);
	551	our $k = 'k1'; # try dynamic too
	552	{
	553	local $h{$k}=222;
	554	is($h{'k1'},222);
	555	$k='k2';
	556	}
	557	ok(! exists($h{'k2'}));
	558	is($h{'k1'},111);
	559	}
72651472	560
07a28ea7 B	561	like( runperl(stderr => 1,
	562	prog => 'use constant foo => q(a);' .
	563	'index(q(a), foo);' .
45f2a18c	564	'local *g=${::}{foo};print q(ok);'), "ok", "[perl #52740]");
07a28ea7	565
72651472 NC	566	# Keep this test last, as it can SEGV
	567	{
	568	local *@;
	569	pass("Localised *@");
	570	eval {1};
	571	pass("Can eval with *@ localised");
	572	}
	573