Skip to content

Instantly share code, notes, and snippets.

@neilb

neilb/hacked-lib-overload-t.pl

Created March 8, 2022 09:51
Show Gist options
  • Save neilb/924beea9d8a13424d69d5b6cd8f14885 to your computer and use it in GitHub Desktop.
Save neilb/924beea9d8a13424d69d5b6cd8f14885 to your computer and use it in GitHub Desktop.
Download ZIP
This is my modified version of $PERL/lib/overload.t, with changes that make the testsuite pass on a taint-free perl
Raw
hacked-lib-overload-t.pl
#!./perl -T
BEGIN {
chdir 't' if -d 't';
@INC = '../lib';
require Config;
if (($Config::Config{'extensions'} !~ m!\bList/Util\b!) ){
print "1..0 # Skip -- Perl configured without List::Util module\n";
exit 0;
}
}
my $no_taint_support = exists($Config::Config{taint_support})
&& !$Config::Config{taint_support};
my %skip_fetch_count_when_no_taint = (
'<${$ts}> RT57012_OV' => 1,
'<use integer; ${$ts}> RT57012_OV' => 1,
'<do {&{$ts} for 1,2}> RT57012_OV' => 1,
'<use integer; do {&{$ts} for 1,2}> RT57012_OV' => 1,
'<*RT57012B = *{$ts}; our $RT57012B> RT57012_OV' => 1,
'<use integer; *RT57012B = *{$ts}; our $RT57012B> RT57012_OV' => 1,
);
sub is_if_taint_supported {
my ($got, $expected, $name, @mess) = @_;
if ($expected && $no_taint_support) {
return skip("your perl was built without taint support");
}
else {
return is($got, $expected, $name, @mess);
}
}
package Oscalar;
use overload (
# Anonymous subroutines:
'+' => sub {new Oscalar $ {$_[0]}+$_[1]},
'-' => sub {new Oscalar
$_[2]? $_[1]-${$_[0]} : ${$_[0]}-$_[1]},
'<=>' => sub {new Oscalar
$_[2]? $_[1]-${$_[0]} : ${$_[0]}-$_[1]},
'cmp' => sub {new Oscalar
$_[2]? ($_[1] cmp ${$_[0]}) : (${$_[0]} cmp $_[1])},
'*' => sub {new Oscalar ${$_[0]}*$_[1]},
'/' => sub {new Oscalar
$_[2]? $_[1]/${$_[0]} :
${$_[0]}/$_[1]},
'%' => sub {new Oscalar
$_[2]? $_[1]%${$_[0]} : ${$_[0]}%$_[1]},
'**' => sub {new Oscalar
$_[2]? $_[1]**${$_[0]} : ${$_[0]}-$_[1]},
qw(
"" stringify
0+ numify) # Order of arguments insignificant
);
sub new {
my $foo = $_[1];
bless \$foo, $_[0];
}
sub stringify { "${$_[0]}" }
sub numify { 0 + "${$_[0]}" } # Not needed, additional overhead
# comparing to direct compilation based on
# stringify
package main;
$| = 1;
BEGIN { require './test.pl'; require './charset_tools.pl' }
plan tests => 5363;
use Scalar::Util qw(tainted);
$a = new Oscalar "087";
$b= "$a";
is($b, $a);
is($b, "087");
is(ref $a, "Oscalar");
is($a, $a);
is($a, "087");
$c = $a + 7;
is(ref $c, "Oscalar");
isnt($c, $a);
is($c, "94");
$b=$a;
is(ref $a, "Oscalar");
$b++;
is(ref $b, "Oscalar");
is($a, "087");
is($b, "88");
is(ref $a, "Oscalar");
$c=$b;
$c-=$a;
is(ref $c, "Oscalar");
is($a, "087");
is($c, "1");
is(ref $a, "Oscalar");
$b=1;
$b+=$a;
is(ref $b, "Oscalar");
is($a, "087");
is($b, "88");
is(ref $a, "Oscalar");
eval q[ package Oscalar; use overload ('++' => sub { $ {$_[0]}++;$_[0] } ) ];
$b=$a;
is(ref $a, "Oscalar");
$b++;
is(ref $b, "Oscalar");
is($a, "087");
is($b, "88");
is(ref $a, "Oscalar");
package Oscalar;
$dummy=bless \$dummy; # Now cache of method should be reloaded
package main;
$b=$a;
$b++;
is(ref $b, "Oscalar");
is($a, "087");
is($b, "88");
is(ref $a, "Oscalar");
undef $b; # Destroying updates tables too...
eval q[package Oscalar; use overload ('++' => sub { $ {$_[0]} += 2; $_[0] } ) ];
$b=$a;
is(ref $a, "Oscalar");
$b++;
is(ref $b, "Oscalar");
is($a, "087");
is($b, "89");
is(ref $a, "Oscalar");
package Oscalar;
$dummy=bless \$dummy; # Now cache of method should be reloaded
package main;
$b++;
is(ref $b, "Oscalar");
is($a, "087");
is($b, "91");
is(ref $a, "Oscalar");
$b=$a;
$b++;
is(ref $b, "Oscalar");
is($a, "087");
is($b, "89");
is(ref $a, "Oscalar");
ok($b? 1:0);
eval q[ package Oscalar; use overload ('=' => sub {$main::copies++;
package Oscalar;
local $new=$ {$_[0]};
bless \$new } ) ];
$b=new Oscalar "$a";
is(ref $b, "Oscalar");
is($a, "087");
is($b, "087");
is(ref $a, "Oscalar");
$b++;
is(ref $b, "Oscalar");
is($a, "087");
is($b, "89");
is(ref $a, "Oscalar");
is($copies, undef);
$b+=1;
is(ref $b, "Oscalar");
is($a, "087");
is($b, "90");
is(ref $a, "Oscalar");
is($copies, undef);
$b=$a;
$b+=1;
is(ref $b, "Oscalar");
is($a, "087");
is($b, "88");
is(ref $a, "Oscalar");
is($copies, undef);
$b=$a;
$b++;
is(ref $b, "Oscalar");
is($a, "087");
is($b, "89");
is(ref $a, "Oscalar");
is($copies, 1);
eval q[package Oscalar; use overload ('+=' => sub {$ {$_[0]} += 3*$_[1];
$_[0] } ) ];
$c=new Oscalar; # Cause rehash
$b=$a;
$b+=1;
is(ref $b, "Oscalar");
is($a, "087");
is($b, "90");
is(ref $a, "Oscalar");
is($copies, 2);
$b+=$b;
is(ref $b, "Oscalar");
is($b, "360");
is($copies, 2);
$b=-$b;
is(ref $b, "Oscalar");
is($b, "-360");
is($copies, 2);
$b=abs($b);
is(ref $b, "Oscalar");
is($b, "360");
is($copies, 2);
$b=abs($b);
is(ref $b, "Oscalar");
is($b, "360");
is($copies, 2);
eval q[package Oscalar;
use overload ('x' => sub {new Oscalar ( $_[2] ? "_.$_[1]._" x $ {$_[0]}
: "_.${$_[0]}._" x $_[1])}) ];
$a=new Oscalar "yy";
$a x= 3;
is($a, "_.yy.__.yy.__.yy._");
eval q[package Oscalar;
use overload ('.' => sub {new Oscalar ( $_[2] ?
"_.$_[1].__.$ {$_[0]}._"
: "_.$ {$_[0]}.__.$_[1]._")}) ];
$a=new Oscalar "xx";
is("b${a}c", "_._.b.__.xx._.__.c._");
# Check inheritance of overloading;
{
package OscalarI;
@ISA = 'Oscalar';
}
$aI = new OscalarI "$a";
is(ref $aI, "OscalarI");
is("$aI", "xx");
is($aI, "xx");
is("b${aI}c", "_._.b.__.xx._.__.c._");
# Here we test that both "no overload" and
# blessing to a package update hash
eval "package Oscalar; no overload '.'";
is("b${a}", "bxx");
$x="1";
bless \$x, Oscalar;
is("b${a}c", "bxxc");
new Oscalar 1;
is("b${a}c", "bxxc");
# Negative overloading:
$na = eval { ~$a };
like($@, qr/no method found/);
# Check AUTOLOADING:
*Oscalar::AUTOLOAD =
sub { *{"Oscalar::$AUTOLOAD"} = sub {"_!_" . shift() . "_!_"} ;
goto &{"Oscalar::$AUTOLOAD"}};
eval "package Oscalar; sub comple; use overload '~' => 'comple'";
$na = eval { ~$a };
is($@, '');
bless \$x, Oscalar;
$na = eval { ~$a }; # Hash updated
warn "'$na', $@" if $@;
ok !$@;
is($na, '_!_xx_!_');
$na = 0;
$na = eval { ~$aI };
is($@, '');
bless \$x, OscalarI;
$na = eval { ~$aI };
print $@;
ok(!$@);
is($na, '_!_xx_!_');
eval "package Oscalar; sub rshft; use overload '>>' => 'rshft'";
$na = eval { $aI >> 1 };
is($@, '');
bless \$x, OscalarI;
$na = 0;
$na = eval { $aI >> 1 };
print $@;
ok(!$@);
is($na, '_!_xx_!_');
# warn overload::Method($a, '0+'), "\n";
is(overload::Method($a, '0+'), \&Oscalar::numify);
is(overload::Method($aI,'0+'), \&Oscalar::numify);
ok(overload::Overloaded($aI));
ok(!overload::Overloaded('overload'));
ok(! defined overload::Method($aI, '<<'));
ok(! defined overload::Method($a, '<'));
like (overload::StrVal($aI), qr/^OscalarI=SCALAR\(0x[\da-fA-F]+\)$/);
is(overload::StrVal(\$aI), "@{[\$aI]}");
# Check overloading by methods (specified deep in the ISA tree).
{
package OscalarII;
@ISA = 'OscalarI';
sub Oscalar::lshft {"_<<_" . shift() . "_<<_"}
eval "package OscalarI; use overload '<<' => 'lshft', '|' => 'lshft'";
}
$aaII = "087";
$aII = \$aaII;
bless $aII, 'OscalarII';
bless \$fake, 'OscalarI'; # update the hash
is(($aI | 3), '_<<_xx_<<_');
# warn $aII << 3;
is(($aII << 3), '_<<_087_<<_');
{
BEGIN { $int = 7; overload::constant 'integer' => sub {$int++; shift}; }
$out = 2**10;
}
is($int, 9);
is($out, 1024);
is($int, 9);
{
BEGIN { overload::constant 'integer' => sub {$int++; shift()+1}; }
eval q{$out = 42};
}
is($int, 10);
is($out, 43);
$foo = 'foo';
$foo1 = 'f\'o\\o';
{
BEGIN { $q = $qr = 7;
overload::constant 'q' => sub {$q++; push @q, shift, ($_[1] || 'none'); shift},
'qr' => sub {$qr++; push @qr, shift, ($_[1] || 'none'); shift}; }
$out = 'foo';
$out1 = 'f\'o\\o';
$out2 = "a\a$foo,\,";
/b\b$foo.\./;
}
is($out, 'foo');
is($out, $foo);
is($out1, 'f\'o\\o');
is($out1, $foo1);
is($out2, "a\afoo,\,");
is("@q", "foo q f'o\\\\o q a\\a qq ,\\, qq");
is($q, 11);
is("@qr", "b\\b qq .\\. qq");
is($qr, 9);
{
$_ = '!<b>!foo!<-.>!';
BEGIN { overload::constant 'q' => sub {push @q1, shift, ($_[1] || 'none'); "_<" . (shift) . ">_"},
'qr' => sub {push @qr1, shift, ($_[1] || 'none'); "!<" . (shift) . ">!"}; }
$out = 'foo';
$out1 = 'f\'o\\o';
$out2 = "a\a$foo,\,";
$res = /b\b$foo.\./;
$a = <<EOF;
oups
EOF
$b = <<'EOF';
oups1
EOF
$c = bareword;
m'try it';
s'first part'second part';
s/yet another/tail here/;
tr/A-Z/a-z/;
}
is($out, '_<foo>_');
is($out1, '_<f\'o\\o>_');
is($out2, "_<a\a>_foo_<,\,>_");
is("@q1", "foo q f'o\\\\o q a\\a qq ,\\, qq oups
qq oups1
q second part q tail here s A-Z tr a-z tr");
is("@qr1", "b\\b qq .\\. qq try it q first part q yet another qq");
is($res, 1);
is($a, "_<oups
>_");
is($b, "_<oups1
>_");
is($c, "bareword");
{
package symbolic; # Primitive symbolic calculator
use overload nomethod => \&wrap, '""' => \&str, '0+' => \&num,
'=' => \&cpy, '++' => \&inc, '--' => \&dec;
sub new { shift; bless ['n', @_] }
sub cpy {
my $self = shift;
bless [@$self], ref $self;
}
sub inc { $_[0] = bless ['++', $_[0], 1]; }
sub dec { $_[0] = bless ['--', $_[0], 1]; }
sub wrap {
my ($obj, $other, $inv, $meth) = @_;
if ($meth eq '++' or $meth eq '--') {
@$obj = ($meth, (bless [@$obj]), 1); # Avoid circular reference
return $obj;
}
($obj, $other) = ($other, $obj) if $inv;
bless [$meth, $obj, $other];
}
sub str {
my ($meth, $a, $b) = @{+shift};
$a = 'u' unless defined $a;
if (defined $b) {
"[$meth $a $b]";
} else {
"[$meth $a]";
}
}
my %subr = ( 'n' => sub {$_[0]} );
foreach my $op (split " ", $overload::ops{with_assign}) {
$subr{$op} = $subr{"$op="} = eval "sub {shift() $op shift()}";
}
my @bins = qw(binary 3way_comparison num_comparison str_comparison);
foreach my $op (split " ", "@overload::ops{ @bins }") {
$subr{$op} = eval "sub {shift() $op shift()}";
}
foreach my $op (split " ", "@overload::ops{qw(unary func)}") {
$subr{$op} = eval "sub {$op shift()}";
}
$subr{'++'} = $subr{'+'};
$subr{'--'} = $subr{'-'};
sub num {
my ($meth, $a, $b) = @{+shift};
my $subr = $subr{$meth}
or die "Do not know how to ($meth) in symbolic";
$a = $a->num if ref $a eq __PACKAGE__;
$b = $b->num if ref $b eq __PACKAGE__;
$subr->($a,$b);
}
sub TIESCALAR { my $pack = shift; $pack->new(@_) }
sub FETCH { shift }
sub nop { } # Around a bug
sub vars { my $p = shift; tie($_, $p), $_->nop foreach @_; }
sub STORE {
my $obj = shift;
$#$obj = 1;
$obj->[1] = shift;
}
}
{
my $foo = new symbolic 11;
my $baz = $foo++;
is((sprintf "%d", $foo), '12');
is((sprintf "%d", $baz), '11');
my $bar = $foo;
$baz = ++$foo;
is((sprintf "%d", $foo), '13');
is((sprintf "%d", $bar), '12');
is((sprintf "%d", $baz), '13');
my $ban = $foo;
$baz = ($foo += 1);
is((sprintf "%d", $foo), '14');
is((sprintf "%d", $bar), '12');
is((sprintf "%d", $baz), '14');
is((sprintf "%d", $ban), '13');
$baz = 0;
$baz = $foo++;
is((sprintf "%d", $foo), '15');
is((sprintf "%d", $baz), '14');
is("$foo", '[++ [+= [++ [++ [n 11] 1] 1] 1] 1]');
}
{
my $iter = new symbolic 2;
my $side = new symbolic 1;
my $cnt = $iter;
while ($cnt) {
$cnt = $cnt - 1; # The "simple" way
$side = (sqrt(1 + $side**2) - 1)/$side;
}
my $pi = $side*(2**($iter+2));
is("$side", '[/ [- [sqrt [+ 1 [** [/ [- [sqrt [+ 1 [** [n 1] 2]]] 1] [n 1]] 2]]] 1] [/ [- [sqrt [+ 1 [** [n 1] 2]]] 1] [n 1]]]');
is((sprintf "%f", $pi), '3.182598');
}
{
my $iter = new symbolic 2;
my $side = new symbolic 1;
my $cnt = $iter;
while ($cnt--) {
$side = (sqrt(1 + $side**2) - 1)/$side;
}
my $pi = $side*(2**($iter+2));
is("$side", '[/ [- [sqrt [+ 1 [** [/ [- [sqrt [+ 1 [** [n 1] 2]]] 1] [n 1]] 2]]] 1] [/ [- [sqrt [+ 1 [** [n 1] 2]]] 1] [n 1]]]');
is((sprintf "%f", $pi), '3.182598');
}
{
my ($a, $b);
symbolic->vars($a, $b);
my $c = sqrt($a**2 + $b**2);
$a = 3; $b = 4;
is((sprintf "%d", $c), '5');
$a = 12; $b = 5;
is((sprintf "%d", $c), '13');
}
{
package symbolic1; # Primitive symbolic calculator
# Mutator inc/dec
use overload nomethod => \&wrap, '""' => \&str, '0+' => \&num, '=' => \&cpy;
sub new { shift; bless ['n', @_] }
sub cpy {
my $self = shift;
bless [@$self], ref $self;
}
sub wrap {
my ($obj, $other, $inv, $meth) = @_;
if ($meth eq '++' or $meth eq '--') {
@$obj = ($meth, (bless [@$obj]), 1); # Avoid circular reference
return $obj;
}
($obj, $other) = ($other, $obj) if $inv;
bless [$meth, $obj, $other];
}
sub str {
my ($meth, $a, $b) = @{+shift};
$a = 'u' unless defined $a;
if (defined $b) {
"[$meth $a $b]";
} else {
"[$meth $a]";
}
}
my %subr = ( 'n' => sub {$_[0]} );
foreach my $op (split " ", $overload::ops{with_assign}) {
$subr{$op} = $subr{"$op="} = eval "sub {shift() $op shift()}";
}
my @bins = qw(binary 3way_comparison num_comparison str_comparison);
foreach my $op (split " ", "@overload::ops{ @bins }") {
$subr{$op} = eval "sub {shift() $op shift()}";
}
foreach my $op (split " ", "@overload::ops{qw(unary func)}") {
$subr{$op} = eval "sub {$op shift()}";
}
$subr{'++'} = $subr{'+'};
$subr{'--'} = $subr{'-'};
sub num {
my ($meth, $a, $b) = @{+shift};
my $subr = $subr{$meth}
or die "Do not know how to ($meth) in symbolic";
$a = $a->num if ref $a eq __PACKAGE__;
$b = $b->num if ref $b eq __PACKAGE__;
$subr->($a,$b);
}
sub TIESCALAR { my $pack = shift; $pack->new(@_) }
sub FETCH { shift }
sub vars { my $p = shift; tie($_, $p) foreach @_; }
sub STORE {
my $obj = shift;
$#$obj = 1;
$obj->[1] = shift;
}
}
{
my $foo = new symbolic1 11;
my $baz = $foo++;
is((sprintf "%d", $foo), '12');
is((sprintf "%d", $baz), '11');
my $bar = $foo;
$baz = ++$foo;
is((sprintf "%d", $foo), '13');
is((sprintf "%d", $bar), '12');
is((sprintf "%d", $baz), '13');
my $ban = $foo;
$baz = ($foo += 1);
is((sprintf "%d", $foo), '14');
is((sprintf "%d", $bar), '12');
is((sprintf "%d", $baz), '14');
is((sprintf "%d", $ban), '13');
$baz = 0;
$baz = $foo++;
is((sprintf "%d", $foo), '15');
is((sprintf "%d", $baz), '14');
is("$foo", '[++ [+= [++ [++ [n 11] 1] 1] 1] 1]');
}
{
my $iter = new symbolic1 2;
my $side = new symbolic1 1;
my $cnt = $iter;
while ($cnt) {
$cnt = $cnt - 1; # The "simple" way
$side = (sqrt(1 + $side**2) - 1)/$side;
}
my $pi = $side*(2**($iter+2));
is("$side", '[/ [- [sqrt [+ 1 [** [/ [- [sqrt [+ 1 [** [n 1] 2]]] 1] [n 1]] 2]]] 1] [/ [- [sqrt [+ 1 [** [n 1] 2]]] 1] [n 1]]]');
is((sprintf "%f", $pi), '3.182598');
}
{
my $iter = new symbolic1 2;
my $side = new symbolic1 1;
my $cnt = $iter;
while ($cnt--) {
$side = (sqrt(1 + $side**2) - 1)/$side;
}
my $pi = $side*(2**($iter+2));
is("$side", '[/ [- [sqrt [+ 1 [** [/ [- [sqrt [+ 1 [** [n 1] 2]]] 1] [n 1]] 2]]] 1] [/ [- [sqrt [+ 1 [** [n 1] 2]]] 1] [n 1]]]');
is((sprintf "%f", $pi), '3.182598');
}
{
my ($a, $b);
symbolic1->vars($a, $b);
my $c = sqrt($a**2 + $b**2);
$a = 3; $b = 4;
is((sprintf "%d", $c), '5');
$a = 12; $b = 5;
is((sprintf "%d", $c), '13');
}
{
package two_face; # Scalars with separate string and
# numeric values.
sub new { my $p = shift; bless [@_], $p }
use overload '""' => \&str, '0+' => \&num, fallback => 1;
sub num {shift->[1]}
sub str {shift->[0]}
}
{
my $seven = new two_face ("vii", 7);
is((sprintf "seven=$seven, seven=%d, eight=%d", $seven, $seven+1),
'seven=vii, seven=7, eight=8');
is(scalar ($seven =~ /i/), '1');
}
{
package sorting;
use overload 'cmp' => \&comp;
sub new { my ($p, $v) = @_; bless \$v, $p }
sub comp { my ($x,$y) = @_; ($$x * 3 % 10) <=> ($$y * 3 % 10) or $$x cmp $$y }
}
{
my @arr = map sorting->new($_), 0..12;
my @sorted1 = sort @arr;
my @sorted2 = map $$_, @sorted1;
is("@sorted2", '0 10 7 4 1 11 8 5 12 2 9 6 3');
}
{
package iterator;
use overload '<>' => \&iter;
sub new { my ($p, $v) = @_; bless \$v, $p }
sub iter { my ($x) = @_; return undef if $$x < 0; return $$x--; }
}
{
my $iter = iterator->new(5);
my $acc = '';
my $out;
$acc .= " $out" while $out = <${iter}>;
is($acc, ' 5 4 3 2 1 0');
$iter = iterator->new(5);
is(scalar <${iter}>, '5');
$acc = '';
$acc .= " $out" while $out = <$iter>;
is($acc, ' 4 3 2 1 0');
}
{
package deref;
use overload '%{}' => \&hderef, '&{}' => \&cderef,
'*{}' => \&gderef, '${}' => \&sderef, '@{}' => \&aderef;
sub new { my ($p, $v) = @_; bless \$v, $p }
sub deref {
my ($self, $key) = (shift, shift);
my $class = ref $self;
bless $self, 'deref::dummy'; # Disable overloading of %{}
my $out = $self->{$key};
bless $self, $class; # Restore overloading
$out;
}
sub hderef {shift->deref('h')}
sub aderef {shift->deref('a')}
sub cderef {shift->deref('c')}
sub gderef {shift->deref('g')}
sub sderef {shift->deref('s')}
}
{
my $deref = bless { h => { foo => 5 , fake => 23 },
c => sub {return shift() + 34},
's' => \123,
a => [11..13],
g => \*srt,
}, 'deref';
# Hash:
my @cont = sort %$deref;
if ("\t" eq "\011") { # ASCII
is("@cont", '23 5 fake foo');
}
else { # EBCDIC alpha-numeric sort order
is("@cont", 'fake foo 23 5');
}
my @keys = sort keys %$deref;
is("@keys", 'fake foo');
my @val = sort values %$deref;
is("@val", '23 5');
is($deref->{foo}, 5);
is(defined $deref->{bar}, '');
my $key;
@keys = ();
push @keys, $key while $key = each %$deref;
@keys = sort @keys;
is("@keys", 'fake foo');
is(exists $deref->{bar}, '');
is(exists $deref->{foo}, 1);
# Code:
is($deref->(5), 39);
is(&$deref(6), 40);
sub xxx_goto { goto &$deref }
is(xxx_goto(7), 41);
my $srt = bless { c => sub {$b <=> $a}
}, 'deref';
*srt = \&$srt;
my @sorted = sort srt 11, 2, 5, 1, 22;
is("@sorted", '22 11 5 2 1');
# Scalar
is($$deref, 123);
# Code
@sorted = sort $srt 11, 2, 5, 1, 22;
is("@sorted", '22 11 5 2 1');
# Array
is("@$deref", '11 12 13');
is($#$deref, '2');
my $l = @$deref;
is($l, 3);
is($deref->[2], '13');
$l = pop @$deref;
is($l, 13);
$l = 1;
is($deref->[$l], '12');
# Repeated dereference
my $double = bless { h => $deref,
}, 'deref';
is($double->{foo}, 5);
}
{
package two_refs;
use overload '%{}' => \&gethash, '@{}' => sub { ${shift()} };
sub new {
my $p = shift;
bless \ [@_], $p;
}
sub gethash {
my %h;
my $self = shift;
tie %h, ref $self, $self;
\%h;
}
sub TIEHASH { my $p = shift; bless \ shift, $p }
my %fields;
my $i = 0;
$fields{$_} = $i++ foreach qw{zero one two three};
sub STORE {
my $self = ${shift()};
my $key = $fields{shift()};
defined $key or die "Out of band access";
$$self->[$key] = shift;
}
sub FETCH {
my $self = ${shift()};
my $key = $fields{shift()};
defined $key or die "Out of band access";
$$self->[$key];
}
}
my $bar = new two_refs 3,4,5,6;
$bar->[2] = 11;
is($bar->{two}, 11);
$bar->{three} = 13;
is($bar->[3], 13);
{
package two_refs_o;
@ISA = ('two_refs');
}
$bar = new two_refs_o 3,4,5,6;
$bar->[2] = 11;
is($bar->{two}, 11);
$bar->{three} = 13;
is($bar->[3], 13);
{
package two_refs1;
use overload '%{}' => sub { ${shift()}->[1] },
'@{}' => sub { ${shift()}->[0] };
sub new {
my $p = shift;
my $a = [@_];
my %h;
tie %h, $p, $a;
bless \ [$a, \%h], $p;
}
sub gethash {
my %h;
my $self = shift;
tie %h, ref $self, $self;
\%h;
}
sub TIEHASH { my $p = shift; bless \ shift, $p }
my %fields;
my $i = 0;
$fields{$_} = $i++ foreach qw{zero one two three};
sub STORE {
my $a = ${shift()};
my $key = $fields{shift()};
defined $key or die "Out of band access";
$a->[$key] = shift;
}
sub FETCH {
my $a = ${shift()};
my $key = $fields{shift()};
defined $key or die "Out of band access";
$a->[$key];
}
}
$bar = new two_refs_o 3,4,5,6;
$bar->[2] = 11;
is($bar->{two}, 11);
$bar->{three} = 13;
is($bar->[3], 13);
{
package two_refs1_o;
@ISA = ('two_refs1');
}
$bar = new two_refs1_o 3,4,5,6;
$bar->[2] = 11;
is($bar->{two}, 11);
$bar->{three} = 13;
is($bar->[3], 13);
{
package B;
use overload bool => sub { ${+shift} };
}
my $aaa;
{ my $bbbb = 0; $aaa = bless \$bbbb, B }
is !$aaa, 1;
unless ($aaa) {
pass();
} else {
fail();
}
# check that overload isn't done twice by join
{ my $c = 0;
package Join;
use overload '""' => sub { $c++ };
my $x = join '', bless([]), 'pq', bless([]);
main::is $x, '0pq1';
};
# Test module-specific warning
{
# check the Odd number of arguments for overload::constant warning
my $a = "" ;
local $SIG{__WARN__} = sub {$a = $_[0]} ;
$x = eval ' overload::constant "integer" ; ' ;
is($a, "");
use warnings 'overload' ;
$x = eval ' overload::constant "integer" ; ' ;
like($a, qr/^Odd number of arguments for overload::constant at/);
}
{
# check the '$_[0]' is not an overloadable type warning
my $a = "" ;
local $SIG{__WARN__} = sub {$a = $_[0]} ;
$x = eval ' overload::constant "fred" => sub {} ; ' ;
is($a, "");
use warnings 'overload' ;
$x = eval ' overload::constant "fred" => sub {} ; ' ;
like($a, qr/^'fred' is not an overloadable type at/);
}
{
# check the '$_[1]' is not a code reference warning
my $a = "" ;
local $SIG{__WARN__} = sub {$a = $_[0]} ;
$x = eval ' overload::constant "integer" => 1; ' ;
is($a, "");
use warnings 'overload' ;
$x = eval ' overload::constant "integer" => 1; ' ;
like($a, qr/^'1' is not a code reference at/);
}
{
# check the invalid argument warning [perl #74098]
my $a = "" ;
local $SIG{__WARN__} = sub {$a = $_[0]} ;
$x = eval ' use overload "~|_|~" => sub{} ' ;
eval ' no overload "~|_|~" ' ;
is($a, "");
use warnings 'overload' ;
$x = eval ' use overload "~|_|~" => sub{} ' ;
like($a, qr/^overload arg '~\|_\|~' is invalid at \(eval \d+\) line /,
'invalid arg warning');
undef $a;
eval ' no overload "~|_|~" ' ;
like($a, qr/^overload arg '~\|_\|~' is invalid at \(eval \d+\) line /,
'invalid arg warning');
}
{
my $c = 0;
package ov_int1;
use overload '""' => sub { 3+shift->[0] },
'0+' => sub { 10+shift->[0] },
'int' => sub { 100+shift->[0] };
sub new {my $p = shift; bless [shift], $p}
package ov_int2;
use overload '""' => sub { 5+shift->[0] },
'0+' => sub { 30+shift->[0] },
'int' => sub { 'ov_int1'->new(1000+shift->[0]) };
sub new {my $p = shift; bless [shift], $p}
package noov_int;
use overload '""' => sub { 2+shift->[0] },
'0+' => sub { 9+shift->[0] };
sub new {my $p = shift; bless [shift], $p}
package main;
my $x = new noov_int 11;
my $int_x = int $x;
main::is("$int_x", 20);
$x = new ov_int1 31;
$int_x = int $x;
main::is("$int_x", 131);
$x = new ov_int2 51;
$int_x = int $x;
main::is("$int_x", 1054);
}
# make sure that we don't infinitely recurse
{
my $c = 0;
package Recurse;
use overload '""' => sub { shift },
'0+' => sub { shift },
'bool' => sub { shift },
fallback => 1;
my $x = bless([]);
# For some reason beyond me these have to be oks rather than likes.
main::ok("$x" =~ /Recurse=ARRAY/);
main::ok($x);
main::ok($x+0 =~ qr/Recurse=ARRAY/);
}
# BugID 20010422.003 (#6872)
package Foo;
use overload
'bool' => sub { return !$_[0]->is_zero() || undef; }
;
sub is_zero
{
my $self = shift;
return $self->{var} == 0;
}
sub new
{
my $class = shift;
my $self = {};
$self->{var} = shift;
bless $self,$class;
}
package main;
use strict;
my $r = Foo->new(8);
$r = Foo->new(0);
is(($r || 0), 0);
package utf8_o;
use overload
'""' => sub { return $_[0]->{var}; }
;
sub new
{
my $class = shift;
my $self = {};
$self->{var} = shift;
bless $self,$class;
}
package main;
my $utfvar = new utf8_o 200.2.1;
is("$utfvar", 200.2.1); # 223 - stringify
is("a$utfvar", "a".200.2.1); # 224 - overload via sv_2pv_flags
# 225..227 -- more %{} tests. Hangs in 5.6.0, okay in later releases.
# Basically this example implements strong encapsulation: if Hderef::import()
# were to eval the overload code in the caller's namespace, the privatisation
# would be quite transparent.
package Hderef;
use overload '%{}' => sub { (caller(0))[0] eq 'Foo' ? $_[0] : die "zap" };
package Foo;
@Foo::ISA = 'Hderef';
sub new { bless {}, shift }
sub xet { @_ == 2 ? $_[0]->{$_[1]} :
@_ == 3 ? ($_[0]->{$_[1]} = $_[2]) : undef }
package main;
my $a = Foo->new;
$a->xet('b', 42);
is ($a->xet('b'), 42);
ok (!defined eval { $a->{b} });
like ($@, qr/zap/);
{
package t229;
use overload '=' => sub { 42 },
'++' => sub { my $x = ${$_[0]}; $_[0] };
sub new { my $x = 42; bless \$x }
my $warn;
{
local $SIG{__WARN__} = sub { $warn++ };
my $x = t229->new;
my $y = $x;
eval { $y++ };
}
main::ok (!$warn);
}
{
my ($int, $out1, $out2);
{
BEGIN { $int = 0; overload::constant 'integer' => sub {$int++; 17}; }
$out1 = 0;
$out2 = 1;
}
is($int, 2, "#24313"); # 230
is($out1, 17, "#24313"); # 231
is($out2, 17, "#24313"); # 232
}
{
package perl31793;
use overload cmp => sub { 0 };
package perl31793_fb;
use overload cmp => sub { 0 }, fallback => 1;
package main;
my $o = bless [], 'perl31793';
my $of = bless [], 'perl31793_fb';
my $no = bless [], 'no_overload';
like(overload::StrVal(\"scalar"), qr/^SCALAR\(0x[0-9a-f]+\)$/);
like(overload::StrVal([]), qr/^ARRAY\(0x[0-9a-f]+\)$/);
like(overload::StrVal({}), qr/^HASH\(0x[0-9a-f]+\)$/);
like(overload::StrVal(sub{1}), qr/^CODE\(0x[0-9a-f]+\)$/);
like(overload::StrVal(\*GLOB), qr/^GLOB\(0x[0-9a-f]+\)$/);
like(overload::StrVal(\$o), qr/^REF\(0x[0-9a-f]+\)$/);
like(overload::StrVal(qr/a/), qr/^Regexp=REGEXP\(0x[0-9a-f]+\)$/);
like(overload::StrVal($o), qr/^perl31793=ARRAY\(0x[0-9a-f]+\)$/);
like(overload::StrVal($of), qr/^perl31793_fb=ARRAY\(0x[0-9a-f]+\)$/);
like(overload::StrVal($no), qr/^no_overload=ARRAY\(0x[0-9a-f]+\)$/);
}
{
package Numify;
use overload (qw(0+ numify fallback 1));
sub new {
my $val = $_[1];
bless \$val, $_[0];
}
sub numify { ${$_[0]} }
}
# These all check that overloaded values, rather than reference addresses,
# are what are getting tested.
my ($two, $one, $un, $deux) = map {new Numify $_} 2, 1, 1, 2;
my ($ein, $zwei) = (1, 2);
my %map = (one => 1, un => 1, ein => 1, deux => 2, two => 2, zwei => 2);
foreach my $op (qw(<=> == != < <= > >=)) {
foreach my $l (keys %map) {
foreach my $r (keys %map) {
my $ocode = "\$$l $op \$$r";
my $rcode = "$map{$l} $op $map{$r}";
my $got = eval $ocode;
die if $@;
my $expect = eval $rcode;
die if $@;
is ($got, $expect, $ocode) or print "# $rcode\n";
}
}
}
{
# check that overloading works in regexes
{
package Foo493;
use overload
'""' => sub { "^$_[0][0]\$" },
'.' => sub {
bless [
$_[2]
? (ref $_[1] ? $_[1][0] : $_[1]) . ':' .$_[0][0]
: $_[0][0] . ':' . (ref $_[1] ? $_[1][0] : $_[1])
], 'Foo493'
};
}
my $a = bless [ "a" ], 'Foo493';
like('a', qr/$a/);
like('x:a', qr/x$a/);
like('x:a:=', qr/x$a=$/);
like('x:a:a:=', qr/x$a$a=$/);
}
{
{
package QRonly;
use overload qr => sub { qr/x/ }, fallback => 1;
}
{
my $x = bless [], "QRonly";
# like tries to be too clever, and decides that $x-stringified
# doesn't look like a regex
ok("x" =~ $x, "qr-only matches");
ok("y" !~ $x, "qr-only doesn't match what it shouldn't");
ok("x" =~ /^(??{$x})$/, "qr-only with ?? matches");
ok("y" !~ /^(??{$x})$/, "qr-only with ?? doesn't match what it shouldn't");
ok("xx" =~ /x$x/, "qr-only matches with concat");
like("$x", qr/^QRonly=ARRAY/, "qr-only doesn't have string overload");
my $qr = bless qr/y/, "QRonly";
ok("x" =~ $qr, "qr with qr-overload uses overload");
ok("y" !~ $qr, "qr with qr-overload uses overload");
ok("x" =~ /^(??{$qr})$/, "qr with qr-overload with ?? uses overload");
ok("y" !~ /^(??{$qr})$/, "qr with qr-overload with ?? uses overload");
is("$qr", "".qr/y/, "qr with qr-overload stringify");
my $rx = $$qr;
ok("y" =~ $rx, "bare rx with qr-overload doesn't overload match");
ok("x" !~ $rx, "bare rx with qr-overload doesn't overload match");
ok("y" =~ /^(??{$rx})$/, "bare rx with qr-overload with ?? doesn't overload match");
ok("x" !~ /^(??{$rx})$/, "bare rx with qr-overload with ?? doesn't overload match");
is("$rx", "".qr/y/, "bare rx with qr-overload stringify");
}
{
package QRandSTR;
use overload qr => sub { qr/x/ }, q/""/ => sub { "y" };
}
{
my $x = bless [], "QRandSTR";
ok("x" =~ $x, "qr+str uses qr for match");
ok("y" !~ $x, "qr+str uses qr for match");
ok("xx" =~ /x$x/, "qr+str uses qr for match with concat");
is("$x", "y", "qr+str uses str for stringify");
my $qr = bless qr/z/, "QRandSTR";
is("$qr", "y", "qr with qr+str uses str for stringify");
ok("xx" =~ /x$x/, "qr with qr+str uses qr for match");
my $rx = $$qr;
ok("z" =~ $rx, "bare rx with qr+str doesn't overload match");
is("$rx", "".qr/z/, "bare rx with qr+str doesn't overload stringify");
}
{
package QRany;
use overload qr => sub { $_[0]->(@_) };
package QRself;
use overload qr => sub { $_[0] };
}
{
my $rx = bless sub { ${ qr/x/ } }, "QRany";
ok("x" =~ $rx, "qr overload accepts a bare rx");
ok("y" !~ $rx, "qr overload accepts a bare rx");
my $str = bless sub { "x" }, "QRany";
ok(!eval { "x" =~ $str }, "qr overload doesn't accept a string");
like($@, qr/^Overloaded qr did not return a REGEXP/, "correct error");
my $oqr = bless qr/z/, "QRandSTR";
my $oqro = bless sub { $oqr }, "QRany";
ok("z" =~ $oqro, "qr overload doesn't recurse");
my $qrs = bless qr/z/, "QRself";
ok("z" =~ $qrs, "qr overload can return self");
}
{
package STRonly;
use overload q/""/ => sub { "x" };
package STRonlyFB;
use overload q/""/ => sub { "x" }, fallback => 1;
}
{
my $fb = bless [], "STRonlyFB";
ok("x" =~ $fb, "qr falls back to \"\"");
ok("y" !~ $fb, "qr falls back to \"\"");
my $nofb = bless [], "STRonly";
ok("x" =~ $nofb, "qr falls back even without fallback");
ok("y" !~ $nofb, "qr falls back even without fallback");
}
}
{
my $twenty_three = 23;
# Check that constant overloading propagates into evals
BEGIN { overload::constant integer => sub { 23 } }
is(eval "17", $twenty_three);
}
{
# Check readonliness of constants, whether shared hash key
# scalars or no (brought up in bug #109744)
BEGIN { overload::constant integer => sub { "main" }; }
eval { ${\5} = 'whatever' };
like $@, qr/^Modification of a read-only value attempted at /,
'constant overloading makes read-only constants';
BEGIN { overload::constant integer => sub { __PACKAGE__ }; }
eval { ${\5} = 'whatever' };
like $@, qr/^Modification of a read-only value attempted at /,
'... even with shared hash key scalars';
}
{
package Sklorsh;
use overload
bool => sub { shift->is_cool };
sub is_cool {
$_[0]->{name} eq 'cool';
}
sub delete {
undef %{$_[0]};
bless $_[0], 'Brap';
return 1;
}
sub delete_with_self {
my $self = shift;
undef %$self;
bless $self, 'Brap';
return 1;
}
package Brap;
1;
package main;
my $obj;
$obj = bless {name => 'cool'}, 'Sklorsh';
$obj->delete;
ok(eval {if ($obj) {1}; 1}, $@ || 'reblessed into nonexistent namespace');
$obj = bless {name => 'cool'}, 'Sklorsh';
$obj->delete_with_self;
ok (eval {if ($obj) {1}; 1}, $@);
my $a = $b = {name => 'hot'};
bless $b, 'Sklorsh';
is(ref $a, 'Sklorsh');
is(ref $b, 'Sklorsh');
ok(!$b, "Expect overloaded boolean");
ok(!$a, "Expect overloaded boolean");
}
{
package Flrbbbbb;
use overload
bool => sub { shift->{truth} eq 'yes' },
'0+' => sub { shift->{truth} eq 'yes' ? '1' : '0' },
'!' => sub { shift->{truth} eq 'no' },
fallback => 1;
sub new { my $class = shift; bless { truth => shift }, $class }
package main;
my $yes = Flrbbbbb->new('yes');
my $x;
$x = 1 if $yes; is($x, 1);
$x = 2 unless $yes; is($x, 1);
$x = 3 if !$yes; is($x, 1);
$x = 4 unless !$yes; is($x, 4);
my $no = Flrbbbbb->new('no');
$x = 0;
$x = 1 if $no; is($x, 0);
$x = 2 unless $no; is($x, 2);
$x = 3 if !$no; is($x, 3);
$x = 4 unless !$no; is($x, 3);
$x = 0;
$x = 1 if !$no && $yes; is($x, 1);
$x = 2 unless !$no && $yes; is($x, 1);
$x = 3 if $no || !$yes; is($x, 1);
$x = 4 unless $no || !$yes; is($x, 4);
$x = 0;
$x = 1 if !$no || !$yes; is($x, 1);
$x = 2 unless !$no || !$yes; is($x, 1);
$x = 3 if !$no && !$yes; is($x, 1);
$x = 4 unless !$no && !$yes; is($x, 4);
}
{
no warnings 'experimental::builtin';
use builtin 'weaken';
package Shklitza;
use overload '""' => sub {"CLiK KLAK"};
package Ksshfwoom;
package main;
my ($obj, $ref);
$obj = bless do {my $a; \$a}, 'Shklitza';
$ref = $obj;
is ("$obj", "CLiK KLAK");
is ("$ref", "CLiK KLAK");
weaken $ref;
is ("$ref", "CLiK KLAK");
bless $obj, 'Ksshfwoom';
like ($obj, qr/^Ksshfwoom=/);
like ($ref, qr/^Ksshfwoom=/);
undef $obj;
is ($ref, undef);
}
{
package bit;
# bit operations have overloadable assignment variants too
sub new { bless \$_[1], $_[0] }
use overload
"&=" => sub { bit->new($_[0]->val . ' & ' . $_[1]->val) },
"^=" => sub { bit->new($_[0]->val . ' ^ ' . $_[1]->val) },
"|" => sub { bit->new($_[0]->val . ' | ' . $_[1]->val) }, # |= by fallback
;
sub val { ${$_[0]} }
package main;
my $a = bit->new(my $va = 'a');
my $b = bit->new(my $vb = 'b');
$a &= $b;
is($a->val, 'a & b', "overloaded &= works");
my $c = bit->new(my $vc = 'c');
$b ^= $c;
is($b->val, 'b ^ c', "overloaded ^= works");
my $d = bit->new(my $vd = 'd');
$c |= $d;
is($c->val, 'c | d', "overloaded |= (by fallback) works");
}
{
# comparison operators with nomethod (bug 41546)
my $warning = "";
my $method;
package nomethod_false;
use overload nomethod => sub { $method = 'nomethod'; 0 };
package nomethod_true;
use overload nomethod => sub { $method= 'nomethod'; 'true' };
package main;
local $^W = 1;
local $SIG{__WARN__} = sub { $warning = $_[0] };
my $f = bless [], 'nomethod_false';
($warning, $method) = ("", "");
is($f eq 'whatever', 0, 'nomethod makes eq return 0');
is($method, 'nomethod');
my $t = bless [], 'nomethod_true';
($warning, $method) = ("", "");
is($t eq 'whatever', 'true', 'nomethod makes eq return "true"');
is($method, 'nomethod');
is($warning, "", 'nomethod eq need not return number');
eval q{
package nomethod_false;
use overload cmp => sub { $method = 'cmp'; 0 };
};
$f = bless [], 'nomethod_false';
($warning, $method) = ("", "");
ok($f eq 'whatever', 'eq falls back to cmp (nomethod not called)');
is($method, 'cmp');
eval q{
package nomethod_true;
use overload cmp => sub { $method = 'cmp'; 'true' };
};
$t = bless [], 'nomethod_true';
($warning, $method) = ("", "");
ok($t eq 'whatever', 'eq falls back to cmp (nomethod not called)');
is($method, 'cmp');
like($warning, qr/isn't numeric/, 'cmp should return number');
}
{
# nomethod called for '!' after attempted fallback
my $nomethod_called = 0;
package nomethod_not;
use overload nomethod => sub { $nomethod_called = 'yes'; };
package main;
my $o = bless [], 'nomethod_not';
my $res = ! $o;
is($nomethod_called, 'yes', "nomethod() is called for '!'");
is($res, 'yes', "nomethod(..., '!') return value propagates");
}
{
# Subtle bug pre 5.10, as a side effect of the overloading flag being
# stored on the reference rather than the referent. Despite the fact that
# objects can only be accessed via references (even internally), the
# referent actually knows that it's blessed, not the references. So taking
# a new, unrelated, reference to it gives an object. However, the
# overloading-or-not flag was on the reference prior to 5.10, and taking
# a new reference didn't (use to) copy it.
package kayo;
use overload '""' => sub {${$_[0]}};
sub Pie {
return "$_[0], $_[1]";
}
package main;
my $class = 'kayo';
my $string = 'bam';
my $crunch_eth = bless \$string, $class;
is("$crunch_eth", $string);
is ($crunch_eth->Pie("Meat"), "$string, Meat");
my $wham_eth = \$string;
is("$wham_eth", $string,
'This reference did not have overloading in 5.8.8 and earlier');
is ($crunch_eth->Pie("Apple"), "$string, Apple");
my $class = ref $wham_eth;
$class =~ s/=.*//;
# Bless it back into its own class!
bless $wham_eth, $class;
is("$wham_eth", $string);
is ($crunch_eth->Pie("Blackbird"), "$string, Blackbird");
}
{
package numify_int;
use overload "0+" => sub { $_[0][0] += 1; 42 };
package numify_self;
use overload "0+" => sub { $_[0][0]++; $_[0] };
package numify_other;
use overload "0+" => sub { $_[0][0]++; $_[0][1] = bless [], 'numify_int' };
package numify_by_fallback;
use overload fallback => 1;
package main;
my $o = bless [], 'numify_int';
is(int($o), 42, 'numifies to integer');
is($o->[0], 1, 'int() numifies only once');
my $aref = [];
my $num_val = int($aref);
my $r = bless $aref, 'numify_self';
is(int($r), $num_val, 'numifies to self');
is($r->[0], 1, 'int() numifies once when returning self');
my $s = bless [], 'numify_other';
is(int($s), 42, 'numifies to numification of other object');
is($s->[0], 1, 'int() numifies once when returning other object');
is($s->[1][0], 1, 'returned object numifies too');
my $m = bless $aref, 'numify_by_fallback';
is(int($m), $num_val, 'numifies to usual reference value');
is(abs($m), $num_val, 'numifies to usual reference value');
is(-$m, -$num_val, 'numifies to usual reference value');
is(0+$m, $num_val, 'numifies to usual reference value');
is($m+0, $num_val, 'numifies to usual reference value');
is($m+$m, 2*$num_val, 'numifies to usual reference value');
is(0-$m, -$num_val, 'numifies to usual reference value');
is(1*$m, $num_val, 'numifies to usual reference value');
is(int($m/1), $num_val, 'numifies to usual reference value');
is($m%100, $num_val%100, 'numifies to usual reference value');
is($m**1, $num_val, 'numifies to usual reference value');
is(abs($aref), $num_val, 'abs() of ref');
is(-$aref, -$num_val, 'negative of ref');
is(0+$aref, $num_val, 'ref addition');
is($aref+0, $num_val, 'ref addition');
is($aref+$aref, 2*$num_val, 'ref addition');
is(0-$aref, -$num_val, 'subtraction of ref');
is(1*$aref, $num_val, 'multiplicaton of ref');
is(int($aref/1), $num_val, 'division of ref');
is($aref%100, $num_val%100, 'modulo of ref');
is($aref**1, $num_val, 'exponentiation of ref');
}
{
package CopyConstructorFallback;
use overload
'++' => sub { "$_[0]"; $_[0] },
fallback => 1;
sub new { bless {} => shift }
package main;
my $o = CopyConstructorFallback->new;
my $x = $o++; # would segfault
my $y = ++$o;
is($x, $o, "copy constructor falls back to assignment (postinc)");
is($y, $o, "copy constructor falls back to assignment (preinc)");
}
# only scalar 'x' should currently overload
{
package REPEAT;
my ($x,$n, $nm);
use overload
'x' => sub { $x++; 1 },
'0+' => sub { $n++; 1 },
'nomethod' => sub { $nm++; 1 },
'fallback' => 0,
;
my $s = bless {};
package main;
my @a;
my $count = 3;
($x,$n,$nm) = (0,0,0);
@a = ((1,2,$s) x $count);
is("$x-$n-$nm", "0-0-0", 'repeat 1');
($x,$n,$nm) = (0,0,0);
@a = ((1,$s,3) x $count);
is("$x-$n-$nm", "0-0-0", 'repeat 2');
($x,$n,$nm) = (0,0,0);
@a = ((1,2,3) x $s);
is("$x-$n-$nm", "0-1-0", 'repeat 3');
}
# RT #57012: magic items need to have mg_get() called before testing for
# overload. Lack of this means that overloaded values returned by eg a
# tied array didn't call overload methods.
# We test here both a tied array and scalar, since the implementation of
# tied arrays (and hashes) is such that in rvalue context, mg_get is
# called prior to executing the op, while it isn't for a tied scalar.
# We also check that return values are correctly tainted.
# We try against two overload packages; one has all expected methods, the
# other uses only fallback methods.
{
# @tests holds a list of test cases. Each elem is an array ref with
# the following entries:
#
# * the value that the overload method should return
#
# * the expression to be evaled. %s is replaced with the
# variable being tested ($ta[0], $ts, or $plain)
#
# * a string listing what functions we expect to be called.
# Each method appends its name in parentheses, so "(=)(+)" means
# we expect the copy constructor and then the add method to be
# called.
#
# * like above, but what should be called for the fallback-only test
# (in this case, nomethod() identifies itself as "(NM:*)" where *
# is the op). If this value is undef, fallback tests are skipped.
#
# * An array ref of expected counts of calls to FETCH/STORE.
# The first three values are:
# 1. the expected number of FETCHs for a tied array
# 2. the expected number of FETCHs for a tied scalar
# 3. the expected number of STOREs
# If there are a further three elements present, then
# these represent the expected counts for the fallback
# version of the tests. If absent, they are assumed to
# be the same as for the full method test
#
# * Under the taint version of the tests, whether we expect
# the result to be tainted (for example comparison ops
# like '==' don't return a tainted value, even if their
# args are.
my @tests;
my %subs;
my $funcs;
my $use_int;
BEGIN {
# A note on what methods to expect to be called, and
# how many times FETCH/STORE is called:
#
# Mutating ops (+=, ++ etc) trigger a copy ('='), since
# the code can't distinguish between something that's been copied:
# $a = foo->new(0); $b = $a; refcnt($$b) == 2
# and overloaded objects stored in ties which will have extra
# refcounts due to the tied_obj magic and entries on the tmps
# stack when returning from FETCH etc. So we always copy.
# This accounts for a '=', and an extra STORE.
# We also have a FETCH returning the final value from the eval,
# plus a FETCH in the overload subs themselves: ($_[0][0])
# triggers one. However, tied aggregates have a mechanism to prevent
# multiple fetches between STOREs, which means that the tied
# hash skips doing a FETCH during '='.
for (qw(+ - * / % ** << >> & | ^)) {
my $op = $_;
$op = '%%' if $op eq '%';
my $e = "%s $op= 3";
$subs{"$_="} = $e;
# ARRAY FETCH: initial, sub+=, eval-return,
# SCALAR FETCH: initial, sub=, sub+=, eval-return,
# STORE: copy, mutator
push @tests, [ 18, $e, "(=)($_=)", "(=)(NM:$_=)", [ 3, 4, 2 ], 1 ];
$subs{$_} =
"do { my \$arg = %s; \$_[2] ? (3 $op \$arg) : (\$arg $op 3) }";
# ARRAY FETCH: initial
# SCALAR FETCH: initial eval-return,
push @tests, [ 18, "%s $op 3", "($_)", "(NM:$_)", [ 1, 2, 0 ], 1 ];
push @tests, [ 18, "3 $op %s", "($_)", "(NM:$_)", [ 1, 2, 0 ], 1 ];
}
# these use string fallback rather than nomethod
for (qw(x .)) {
my $op = $_;
my $e = "%s $op= 3";
$subs{"$_="} = $e;
# For normal case:
# ARRAY FETCH: initial, sub+=, eval-return,
# SCALAR FETCH: initial, sub=, sub+=, eval-return,
# STORE: copy, mutator
# for fallback, we just stringify, so eval-return and copy skipped
push @tests, [ 18, $e, "(=)($_=)", '("")',
[ 3, 4, 2, 2, 3, 1 ], 1 ];
$subs{$_} =
"do { my \$arg = %s; \$_[2] ? (3 $op \$arg) : (\$arg $op 3) }";
# ARRAY FETCH: initial
# SCALAR FETCH: initial eval-return,
# with fallback, we just stringify, so eval-return skipped,
# but an extra FETCH happens in sub"", except for 'x',
# which passes a copy of the RV to sub"", avoiding the
# second FETCH
push @tests, [ 18, "%s $op 3", "($_)", '("")',
[ 1, 2, 0, 1, ($_ eq '.' ? 2 : 1), 0 ], 1 ];
next if $_ eq 'x'; # repeat only overloads on LHS
push @tests, [ 18, "3 $op %s", "($_)", '("")',
[ 1, 2, 0, 1, 2, 0 ], 1 ];
}
for (qw(++ --)) {
my $pre = "$_%s";
my $post = "%s$_";
$subs{$_} = $pre;
push @tests,
# ARRAY FETCH: initial, sub+=, eval-return,
# SCALAR FETCH: initial, sub=, sub+=, eval-return,
# STORE: copy, mutator
[ 18, $pre, "(=)($_)(\"\")", "(=)(NM:$_)(\"\")", [ 3, 4, 2 ], 1 ],
# ARRAY FETCH: initial, sub+=
# SCALAR FETCH: initial, sub=, sub+=
# STORE: copy, mutator
[ 18, $post, "(=)($_)(\"\")", "(=)(NM:$_)(\"\")", [ 2, 3, 2 ], 1 ];
}
# For the non-mutator ops, we have a initial FETCH,
# an extra FETCH within the sub itself for the scalar option,
# and no STOREs
for (qw(< <= > >= == != lt le gt ge eq ne)) {
my $e = "%s $_ 3";
$subs{$_} = $e;
push @tests, [ 3, $e, "($_)", "(NM:$_)", [ 1, 2, 0 ], 0 ];
}
for (qw(<=> cmp)) {
my $e = "%s $_ 3";
$subs{$_} = $e;
push @tests, [ 3, $e, "($_)", "(NM:$_)", [ 1, 2, 0 ], 1 ];
}
for (qw(atan2)) {
my $e = "$_ %s, 3";
$subs{$_} = $e;
push @tests, [ 18, $e, "($_)", "(NM:$_)", [ 1, 2, 0 ], 1 ];
}
for (qw(cos sin exp abs log sqrt int ~)) {
my $e = "$_(%s)";
$subs{$_} = $e;
push @tests, [ 1.23, $e, "($_)",
($_ eq 'int' ? '(0+)' : "(NM:$_)") , [ 1, 2, 0 ], 1 ];
}
for (qw(!)) {
my $e = "$_(%s)";
$subs{$_} = $e;
push @tests, [ 1.23, $e, "($_)", '(0+)', [ 1, 2, 0 ], 0 ];
}
for (qw(-)) {
my $e = "$_(%s)";
$subs{neg} = $e;
push @tests, [ 18, $e, '(neg)', '(NM:neg)', [ 1, 2, 0 ], 1 ];
}
my $e = '(%s) ? 1 : 0';
$subs{bool} = $e;
push @tests, [ 18, $e, '(bool)', '(0+)', [ 1, 2, 0 ], 0 ];
# note: this is testing unary qr, not binary =~
$subs{qr} = '(qr/%s/)';
push @tests, [ "abc", '"abc" =~ (%s)', '(qr)', '("")', [ 1, 2, 0 ], 0 ];
push @tests, [ chr 256, 'chr(256) =~ (%s)', '(qr)', '("")',
[ 1, 2, 0 ], 0 ];
$e = '"abc" ~~ (%s)';
$subs{'~~'} = $e;
push @tests, [ "abc", $e, '(~~)', '(NM:~~)', [ 1, 1, 0 ], 0 ];
$subs{'-X'} = 'do { my $f = (%s);'
. '$_[1] eq "r" ? (-r ($f)) :'
. '$_[1] eq "e" ? (-e ($f)) :'
. '$_[1] eq "f" ? (-f ($f)) :'
. '$_[1] eq "l" ? (-l ($f)) :'
. '$_[1] eq "t" ? (-t ($f)) :'
. '$_[1] eq "T" ? (-T ($f)) : 0;}';
# Note - we don't care what these file tests return, as
# long as the tied and untied versions return the same value.
# The flags below are chosen to test all uses of tryAMAGICftest_MG
for (qw(r e f l t T)) {
push @tests, [ 'TEST', "-$_ (%s)", '(-X)', '("")', [ 1, 2, 0 ], 0 ];
}
$subs{'${}'} = '%s';
push @tests, [ do {my $s=99; \$s}, '${%s}', '(${})', undef, [ 1, 1, 0 ], 0 ];
# we skip testing '@{}' here because too much of this test
# framework involves array dereferences!
$subs{'%{}'} = '%s';
push @tests, [ {qw(a 1 b 2 c 3)}, 'join "", sort keys %%{%s}',
'(%{})', undef, [ 1, 1, 0 ], 0 ];
$subs{'&{}'} = '%s';
push @tests, [ sub {99}, 'do {&{%s} for 1,2}',
'(&{})(&{})', undef, [ 2, 2, 0 ], 0 ];
our $RT57012A = 88;
our $RT57012B;
$subs{'*{}'} = '%s';
push @tests, [ \*RT57012A, '*RT57012B = *{%s}; our $RT57012B',
'(*{})', undef, [ 1, 1, 0 ], 0 ];
my $iter_text = ("some random text\n" x 100) . $^X;
open my $iter_fh, '<', \$iter_text
or die "open of \$iter_text gave ($!)\n";
$subs{'<>'} = '<$iter_fh>';
push @tests, [ $iter_fh, '<%s>', '(<>)', undef, [ 1, 1, 0 ], 1 ];
push @tests, [ $iter_fh,
'local *CORE::GLOBAL::glob = sub {}; eval q|<%s>|',
'(<>)', undef, [ 1, 1, 0 ], 1 ];
# eval should do tie, overload on its arg before checking taint */
push @tests, [ '1;', 'eval q(eval %s); $@ =~ /Insecure/',
'("")', '("")', [ 1, 2, 0 ], 0 ];
for my $sub (keys %subs) {
no warnings 'experimental::smartmatch';
my $term = $subs{$sub};
my $t = sprintf $term, '$_[0][0]';
my $e ="sub { \$funcs .= '($sub)'; my \$r; if (\$use_int) {"
. "use integer; \$r = ($t) } else { \$r = ($t) } \$r }";
$subs{$sub} = eval $e;
die "Compiling sub gave error:\n<$e>\n<$@>\n" if $@;
}
}
my $fetches;
my $stores;
package RT57012_OV;
use overload
%subs,
"=" => sub { $funcs .= '(=)'; bless [ $_[0][0] ] },
'0+' => sub { $funcs .= '(0+)'; 0 + $_[0][0] },
'""' => sub { $funcs .= '("")'; "$_[0][0]" },
;
package RT57012_OV_FB; # only contains fallback conversion functions
use overload
"=" => sub { $funcs .= '(=)'; bless [ $_[0][0] ] },
'0+' => sub { $funcs .= '(0+)'; 0 + $_[0][0] },
'""' => sub { $funcs .= '("")'; "$_[0][0]" },
"nomethod" => sub {
$funcs .= "(NM:$_[3])";
my $e = defined($_[1])
? $_[3] eq 'atan2'
? $_[2]
? "atan2(\$_[1],\$_[0][0])"
: "atan2(\$_[0][0],\$_[1])"
: $_[2]
? "\$_[1] $_[3] \$_[0][0]"
: "\$_[0][0] $_[3] \$_[1]"
: $_[3] eq 'neg'
? "-\$_[0][0]"
: "$_[3](\$_[0][0])";
my $r;
no warnings 'experimental::smartmatch';
if ($use_int) {
use integer; $r = eval $e;
}
else {
$r = eval $e;
}
::diag("eval of nomethod <$e> gave <$@>") if $@;
$r;
}
;
package RT57012_TIE_S;
my $tie_val;
sub TIESCALAR { bless [ bless [ $tie_val ], $_[1] ] }
sub FETCH { $fetches++; $_[0][0] }
sub STORE { $stores++; $_[0][0] = $_[1] }
package RT57012_TIE_A;
sub TIEARRAY { bless [] }
sub FETCH { $fetches++; $_[0][0] }
sub STORE { $stores++; $_[0][$_[1]] = $_[2] }
package main;
for my $test (@tests) {
my ($val, $sub_term, $exp_funcs, $exp_fb_funcs,
$exp_counts, $exp_taint) = @$test;
my $tainted_val;
{
# create tainted version of $val (unless its a ref)
my $t = substr($^X,0,0);
my $t0 = $t."0";
my $val1 = $val; # use a copy to avoid stringifying original
$tainted_val = ref($val1) ? $val :
($val1 =~ /^[\d\.]+$/) ? $val+$t0 : $val.$t;
}
$tie_val = $tainted_val;
for my $int ('', 'use integer; ') {
$use_int = ($int ne '');
my $plain = $tainted_val;
my $plain_term = $int . sprintf $sub_term, '$plain';
my $exp = do {no warnings 'experimental::smartmatch'; eval $plain_term };
diag("eval of plain_term <$plain_term> gave <$@>") if $@;
SKIP: {
is_if_taint_supported(tainted($exp), $exp_taint,
"<$plain_term> taint of expected return");
}
for my $ov_pkg (qw(RT57012_OV RT57012_OV_FB)) {
next if $ov_pkg eq 'RT57012_OV_FB'
and not defined $exp_fb_funcs;
my ($exp_fetch_a, $exp_fetch_s, $exp_store) =
($ov_pkg eq 'RT57012_OV' || @$exp_counts < 4)
? @$exp_counts[0,1,2]
: @$exp_counts[3,4,5];
tie my $ts, 'RT57012_TIE_S', $ov_pkg;
tie my @ta, 'RT57012_TIE_A';
$ta[0] = bless [ $tainted_val ], $ov_pkg;
my $oload = bless [ $tainted_val ], $ov_pkg;
for my $var ('$ta[0]', '$ts', '$oload',
($sub_term eq '<%s>' ? '${ts}' : ())
) {
$funcs = '';
$fetches = 0;
$stores = 0;
my $res_term = $int . sprintf $sub_term, $var;
my $desc = "<$res_term> $ov_pkg" ;
my $res = do { no warnings 'experimental::smartmatch'; eval $res_term };
diag("eval of res_term $desc gave <$@>") if $@;
# uniquely, the inc/dec ops return the original
# ref rather than a copy, so stringify it to
# find out if its tainted
$res = "$res" if $res_term =~ /\+\+|--/;
SKIP: {
is_if_taint_supported(tainted($res), $exp_taint,
"$desc taint of result return");
}
is($res, $exp, "$desc return value");
my $fns =($ov_pkg eq 'RT57012_OV_FB')
? $exp_fb_funcs : $exp_funcs;
if ($var eq '$oload' && $res_term !~ /oload(\+\+|--)/) {
# non-tied overloading doesn't trigger a copy
# except for post inc/dec
$fns =~ s/^\(=\)//;
}
is($funcs, $fns, "$desc methods called");
next if $var eq '$oload';
my $exp_fetch = ($var eq '$ts') ?
$exp_fetch_s : $exp_fetch_a;
SKIP: {
if ($skip_fetch_count_when_no_taint{$desc} && $no_taint_support) {
skip("your perl was built without taint support");
}
else {
is($fetches, $exp_fetch, "$desc FETCH count");
}
}
is($stores, $exp_store, "$desc STORE count");
}
}
}
}
}
# Test overload from the main package
fresh_perl_is
'$^W = 1; use overload q\""\ => sub {"ning"}; print bless []',
'ning',
{ switches => ['-wl'], stderr => 1 },
'use overload from the main package'
;
{
package blessed_methods;
use overload '+' => sub {};
bless overload::Method __PACKAGE__,'+';
eval { overload::Method __PACKAGE__,'+' };
::is($@, '', 'overload::Method and blessed overload methods');
}
{
# fallback to 'cmp' and '<=>' with heterogeneous operands
# [perl #71286]
my $not_found = 'no method found';
my $used = 0;
package CmpBase;
sub new {
my $n = $_[1] || 0;
bless \$n, ref $_[0] || $_[0];
}
sub cmp {
$used = \$_[0];
(${$_[0]} <=> ${$_[1]}) * ($_[2] ? -1 : 1);
}
package NCmp;
use parent '-norequire', 'CmpBase';
use overload '<=>' => 'cmp';
package SCmp;
use parent '-norequire', 'CmpBase';
use overload 'cmp' => 'cmp';
package main;
my $n = NCmp->new(5);
my $s = SCmp->new(3);
my $res;
eval { $res = $n > $s; };
$res = $not_found if $@ =~ /$not_found/;
is($res, 1, 'A>B using A<=> when B overloaded, no B<=>');
eval { $res = $s < $n; };
$res = $not_found if $@ =~ /$not_found/;
is($res, 1, 'A<B using B<=> when A overloaded, no A<=>');
eval { $res = $s lt $n; };
$res = $not_found if $@ =~ /$not_found/;
is($res, 1, 'A lt B using A:cmp when B overloaded, no B:cmp');
eval { $res = $n gt $s; };
$res = $not_found if $@ =~ /$not_found/;
is($res, 1, 'A gt B using B:cmp when A overloaded, no A:cmp');
my $o = NCmp->new(9);
$res = $n < $o;
is($used, \$n, 'A < B uses <=> from A in preference to B');
my $t = SCmp->new(7);
$res = $s lt $t;
is($used, \$s, 'A lt B uses cmp from A in preference to B');
}
{
# Combinatorial testing of 'fallback' and 'nomethod'
# [perl #71286]
package NuMB;
use overload '0+' => sub { ${$_[0]}; },
'""' => 'str';
sub new {
my $self = shift;
my $n = @_ ? shift : 0;
bless my $obj = \$n, ref $self || $self;
}
sub str {
no strict qw/refs/;
my $s = "(${$_[0]} ";
$s .= "nomethod, " if defined ${ref($_[0]).'::(nomethod'};
my $fb = ${ref($_[0]).'::()'};
$s .= "fb=" . (defined $fb ? 0 + $fb : 'undef') . ")";
}
sub nomethod { "${$_[0]}.nomethod"; }
# create classes for tests
package main;
my @falls = (0, 'undef', 1);
my @nomethods = ('', 'nomethod');
my $not_found = 'no method found';
for my $fall (@falls) {
for my $nomethod (@nomethods) {
my $nomethod_decl = $nomethod
? $nomethod . "=>'nomethod'," : '';
eval qq{
package NuMB$fall$nomethod;
use parent '-norequire', qw/NuMB/;
use overload $nomethod_decl
fallback => $fall;
};
}
}
# operation and precedence of 'fallback' and 'nomethod'
# for all combinations with 2 overloaded operands
for my $nomethod2 (@nomethods) {
for my $nomethod1 (@nomethods) {
for my $fall2 (@falls) {
my $pack2 = "NuMB$fall2$nomethod2";
for my $fall1 (@falls) {
my $pack1 = "NuMB$fall1$nomethod1";
my ($test, $out, $exp);
eval qq{
my \$x = $pack1->new(2);
my \$y = $pack2->new(3);
\$test = "\$x" . ' * ' . "\$y";
\$out = \$x * \$y;
};
$out = $not_found if $@ =~ /$not_found/;
$exp = $nomethod1 ? '2.nomethod' :
$nomethod2 ? '3.nomethod' :
$fall1 eq '1' && $fall2 eq '1' ? 6
: $not_found;
is($out, $exp, "$test --> $exp");
}
}
}
}
# operation of 'fallback' and 'nomethod'
# where the other operand is not overloaded
for my $nomethod (@nomethods) {
for my $fall (@falls) {
my ($test, $out, $exp);
eval qq{
my \$x = NuMB$fall$nomethod->new(2);
\$test = "\$x" . ' * 3';
\$out = \$x * 3;
};
$out = $not_found if $@ =~ /$not_found/;
$exp = $nomethod ? '2.nomethod' :
$fall eq '1' ? 6
: $not_found;
is($out, $exp, "$test --> $exp");
eval qq{
my \$x = NuMB$fall$nomethod->new(2);
\$test = '3 * ' . "\$x";
\$out = 3 * \$x;
};
$out = $not_found if $@ =~ /$not_found/;
is($out, $exp, "$test --> $exp");
}
}
}
# since 5.6 overloaded <> was leaving an extra arg on the stack!
{
package Iter1;
use overload '<>' => sub { 11 };
package main;
my $a = bless [], 'Iter1';
my $x;
my @a = (10, ($x = <$a>), 12);
is ($a[0], 10, 'Iter1: a[0]');
is ($a[1], 11, 'Iter1: a[1]');
is ($a[2], 12, 'Iter1: a[2]');
@a = (10, ($x .= <$a>), 12);
is ($a[0], 10, 'Iter1: a[0] concat');
is ($a[1], 1111, 'Iter1: a[1] concat');
is ($a[2], 12, 'Iter1: a[2] concat');
}
# Some tests for error messages
{
package Justus;
use overload '+' => 'justice';
eval {"".bless[]};
::like $@, qr/^Can't resolve method "justice" overloading "\+" in p(?x:
)ackage "Justus" at /,
'Error message when explicitly named overload method does not exist';
package JustUs;
our @ISA = 'JustYou';
package JustYou { use overload '+' => 'injustice'; }
"JustUs"->${\"(+"};
eval {"".bless []};
::like $@, qr/^Stub found while resolving method "\?{3}" overloadin(?x:
)g "\+" in package "JustUs" at /,
'Error message when sub stub is encountered';
}
{
# check that the right number of stringifications
# and the correct un-utf8-ifying happen on regex compile
package utf8_match;
my $c;
use overload '""' => sub { $c++; $_[0][0] ? "^\x{100}\$" : "^A\$"; };
my $o = bless [0], 'utf8_match';
$o->[0] = 0;
$c = 0;
::ok("A" =~ "^A\$", "regex stringify utf8=0 ol=0 bytes=0");
::ok("A" =~ $o, "regex stringify utf8=0 ol=1 bytes=0");
::is($c, 1, "regex stringify utf8=0 ol=1 bytes=0 count");
$o->[0] = 1;
$c = 0;
::ok("\x{100}" =~ "^\x{100}\$",
"regex stringify utf8=1 ol=0 bytes=0");
::ok("\x{100}" =~ $o, "regex stringify utf8=1 ol=1 bytes=0");
::is($c, 1, "regex stringify utf8=1 ol=1 bytes=0 count");
use bytes;
$o->[0] = 0;
$c = 0;
::ok("A" =~ "^A\$", "regex stringify utf8=0 ol=0 bytes=1");
::ok("A" =~ $o, "regex stringify utf8=0 ol=1 bytes=1");
::is($c, 1, "regex stringify utf8=0 ol=1 bytes=1 count");
$o->[0] = 1;
$c = 0;
::ok(main::byte_utf8a_to_utf8n("\xc4\x80") =~ "^\x{100}\$",
"regex stringify utf8=1 ol=0 bytes=1");
::ok(main::byte_utf8a_to_utf8n("\xc4\x80") =~ $o, "regex stringify utf8=1 ol=1 bytes=1");
::is($c, 1, "regex stringify utf8=1 ol=1 bytes=1 count");
}
# [perl #40333]
# overload::Overloaded should not use a ->can designed for autoloading.
# This example attempts to be as realistic as possible. The o class has a
# default singleton object, but can have instances, too. The proxy class
# represents proxies for o objects, but class methods delegate to the
# singleton.
# overload::Overloaded used to return incorrect results for proxy objects.
package proxy {
sub new { bless [$_[1]], $_[0] }
sub AUTOLOAD {
our $AUTOLOAD =~ s/.*:://;
&_self->$AUTOLOAD;
}
sub can { SUPER::can{@_} || &_self->can($_[1]) }
sub _self { ref $_[0] ? $_[0][0] : $o::singleton }
}
package o { use overload '""' => sub { 'keck' };
sub new { bless[], $_[0] }
our $singleton = o->new; }
ok !overload::Overloaded(new proxy new o),
'overload::Overloaded does not incorrectly return true for proxy classes';
# Another test, based on the type of explosive test class for which
# perl #40333 was filed.
{
package broken_can;
sub can {}
use overload '""' => sub {"Ahoy!"};
package main;
my $obj = bless [], 'broken_can';
ok(overload::Overloaded($obj));
}
sub eleventative::cos { 'eleven' }
sub twelvetative::abs { 'twelve' }
sub thirteentative::abs { 'thirteen' }
sub fourteentative::abs { 'fourteen' }
@eleventative::ISA = twelvetative::;
{
my $o = bless [], 'eleventative';
eval 'package eleventative; use overload map +($_)x2, cos=>abs=>';
is cos $o, 'eleven', 'overloading applies to object blessed before';
bless [], 'eleventative';
is cos $o, 'eleven',
'ovrld applies to previously-blessed obj after other obj is blessed';
$o = bless [], 'eleventative';
*eleventative::cos = sub { 'ten' };
is cos $o, 'ten', 'method changes affect overloading';
@eleventative::ISA = thirteentative::;
is abs $o, 'thirteen', 'isa changes affect overloading';
bless $o, 'fourteentative';
@fourteentative::ISA = 'eleventative';
is abs $o, 'fourteen', 'isa changes can turn overloading on';
}
# no overload "fallback";
{ package phake;
use overload fallback => 1, '""' => sub { 'arakas' };
no overload 'fallback';
}
$a = bless [], 'phake';
is "$a", "arakas",
'no overload "fallback" does not stop overload from working';
ok !eval { () = $a eq 'mpizeli'; 1 },
'no overload "fallback" resets fallback to undef on overloaded class';
{ package ent; use overload fallback => 0, abs => sub{};
our@ISA = 'huorn';
package huorn;
use overload fallback => 1;
package ent;
no overload "fallback"; # disable previous declaration
}
$a = bless [], ent::;
is eval {"$a"}, overload::StrVal($a),
'no overload undoes fallback declaration completetly'
or diag $@;
# inherited fallback
{
package pervyy;
our @ISA = 'vtoryy';
use overload "abs" =>=> sub {};
package vtoryy;
use overload fallback => 1, 'sin' =>=> sub{}
}
$a = bless [], pervyy::;
is eval {"$a"}, overload::StrVal($a),
'fallback is inherited by classes that have their own overloading'
or diag $@;
# package separators in method names
{
package mane;
use overload q\""\ => "bear::strength";
use overload bool => "bear'bouillon";
}
@bear::ISA = 'food';
sub food::strength { 'twine' }
sub food::bouillon { 0 }
$a = bless[], mane::;
is eval { "$a" }, 'twine', ':: in method name' or diag $@;
is eval { !$a }, 1, "' in method name" or diag $@;
# [perl #113050] Half of CPAN assumes fallback is under "()"
{
package dodo;
use overload '+' => sub {};
no strict;
*{"dodo::()"} = sub{};
${"dodo::()"} = 1;
}
$a = bless [],'dodo';
is eval {"$a"}, overload::StrVal($a), 'fallback is stored under "()"';
# [perl #47119]
{
my $context;
{
package Splitter;
use overload '<>' => \&chars;
sub new {
my $class = shift;
my ($string) = @_;
bless \$string, $class;
}
sub chars {
my $self = shift;
my @chars = split //, $$self;
$context = wantarray;
return @chars;
}
}
my $obj = Splitter->new('bar');
$context = 42; # not 1, '', or undef
my @foo = <$obj>;
is($context, 1, "list context (readline list)");
is(scalar(@foo), 3, "correct result (readline list)");
is($foo[0], 'b', "correct result (readline list)");
is($foo[1], 'a', "correct result (readline list)");
is($foo[2], 'r', "correct result (readline list)");
$context = 42;
my $foo = <$obj>;
ok(defined($context), "scalar context (readline scalar)");
is($context, '', "scalar context (readline scalar)");
is($foo, 3, "correct result (readline scalar)");
$context = 42;
<$obj>;
ok(!defined($context), "void context (readline void)");
$context = 42;
my @bar = <${obj}>;
is($context, 1, "list context (glob list)");
is(scalar(@bar), 3, "correct result (glob list)");
is($bar[0], 'b', "correct result (glob list)");
is($bar[1], 'a', "correct result (glob list)");
is($bar[2], 'r', "correct result (glob list)");
$context = 42;
my $bar = <${obj}>;
ok(defined($context), "scalar context (glob scalar)");
is($context, '', "scalar context (glob scalar)");
is($bar, 3, "correct result (glob scalar)");
$context = 42;
<${obj}>;
ok(!defined($context), "void context (glob void)");
}
{
my $context;
{
package StringWithContext;
use overload '""' => \&stringify;
sub new {
my $class = shift;
my ($string) = @_;
bless \$string, $class;
}
sub stringify {
my $self = shift;
$context = wantarray;
return $$self;
}
}
my $obj = StringWithContext->new('bar');
$context = 42;
my @foo = "".$obj;
ok(defined($context), "scalar context (stringify list)");
is($context, '', "scalar context (stringify list)");
is(scalar(@foo), 1, "correct result (stringify list)");
is($foo[0], 'bar', "correct result (stringify list)");
$context = 42;
my $foo = "".$obj;
ok(defined($context), "scalar context (stringify scalar)");
is($context, '', "scalar context (stringify scalar)");
is($foo, 'bar', "correct result (stringify scalar)");
$context = 42;
"".$obj;
is($context, '', "scalar context (stringify void)");
}
{
my ($context, $swap);
{
package AddWithContext;
use overload '+' => \&add;
sub new {
my $class = shift;
my ($num) = @_;
bless \$num, $class;
}
sub add {
my $self = shift;
my ($other, $swapped) = @_;
$context = wantarray;
$swap = $swapped;
return ref($self)->new($$self + $other);
}
sub val { ${ $_[0] } }
}
my $obj = AddWithContext->new(6);
$context = $swap = 42;
my @foo = $obj + 7;
ok(defined($context), "scalar context (add list)");
is($context, '', "scalar context (add list)");
ok(defined($swap), "not swapped (add list)");
is($swap, '', "not swapped (add list)");
is(scalar(@foo), 1, "correct result (add list)");
is($foo[0]->val, 13, "correct result (add list)");
$context = $swap = 42;
@foo = 7 + $obj;
ok(defined($context), "scalar context (add list swap)");
is($context, '', "scalar context (add list swap)");
ok(defined($swap), "swapped (add list swap)");
is($swap, 1, "swapped (add list swap)");
is(scalar(@foo), 1, "correct result (add list swap)");
is($foo[0]->val, 13, "correct result (add list swap)");
$context = $swap = 42;
my $foo = $obj + 7;
ok(defined($context), "scalar context (add scalar)");
is($context, '', "scalar context (add scalar)");
ok(defined($swap), "not swapped (add scalar)");
is($swap, '', "not swapped (add scalar)");
is($foo->val, 13, "correct result (add scalar)");
$context = $swap = 42;
my $foo = 7 + $obj;
ok(defined($context), "scalar context (add scalar swap)");
is($context, '', "scalar context (add scalar swap)");
ok(defined($swap), "swapped (add scalar swap)");
is($swap, 1, "swapped (add scalar swap)");
is($foo->val, 13, "correct result (add scalar swap)");
$context = $swap = 42;
$obj + 7;
ok(!defined($context), "void context (add void)");
ok(defined($swap), "not swapped (add void)");
is($swap, '', "not swapped (add void)");
$context = $swap = 42;
7 + $obj;
ok(!defined($context), "void context (add void swap)");
ok(defined($swap), "swapped (add void swap)");
is($swap, 1, "swapped (add void swap)");
$obj = AddWithContext->new(6);
$context = $swap = 42;
my @foo = $obj += 7;
ok(defined($context), "scalar context (add assign list)");
is($context, '', "scalar context (add assign list)");
ok(!defined($swap), "not swapped and autogenerated (add assign list)");
is(scalar(@foo), 1, "correct result (add assign list)");
is($foo[0]->val, 13, "correct result (add assign list)");
is($obj->val, 13, "correct result (add assign list)");
$obj = AddWithContext->new(6);
$context = $swap = 42;
my $foo = $obj += 7;
ok(defined($context), "scalar context (add assign scalar)");
is($context, '', "scalar context (add assign scalar)");
ok(!defined($swap), "not swapped and autogenerated (add assign scalar)");
is($foo->val, 13, "correct result (add assign scalar)");
is($obj->val, 13, "correct result (add assign scalar)");
$obj = AddWithContext->new(6);
$context = $swap = 42;
$obj += 7;
ok(defined($context), "scalar context (add assign void)");
is($context, '', "scalar context (add assign void)");
ok(!defined($swap), "not swapped and autogenerated (add assign void)");
is($obj->val, 13, "correct result (add assign void)");
$obj = AddWithContext->new(6);
$context = $swap = 42;
my @foo = ++$obj;
ok(defined($context), "scalar context (add incr list)");
is($context, '', "scalar context (add incr list)");
ok(!defined($swap), "not swapped and autogenerated (add incr list)");
is(scalar(@foo), 1, "correct result (add incr list)");
is($foo[0]->val, 7, "correct result (add incr list)");
is($obj->val, 7, "correct result (add incr list)");
$obj = AddWithContext->new(6);
$context = $swap = 42;
my $foo = ++$obj;
ok(defined($context), "scalar context (add incr scalar)");
is($context, '', "scalar context (add incr scalar)");
ok(!defined($swap), "not swapped and autogenerated (add incr scalar)");
is($foo->val, 7, "correct result (add incr scalar)");
is($obj->val, 7, "correct result (add incr scalar)");
$obj = AddWithContext->new(6);
$context = $swap = 42;
++$obj;
ok(defined($context), "scalar context (add incr void)");
is($context, '', "scalar context (add incr void)");
ok(!defined($swap), "not swapped and autogenerated (add incr void)");
is($obj->val, 7, "correct result (add incr void)");
}
# [perl #113010]
{
{
package OnlyFallback;
use overload fallback => 0;
}
{
my $obj = bless {}, 'OnlyFallback';
my $died = !eval { "".$obj; 1 };
my $err = $@;
ok($died, "fallback of 0 causes error");
like($err, qr/"\.": no method found/, "correct error");
}
{
package OnlyFallbackUndef;
use overload fallback => undef;
}
{
my $obj = bless {}, 'OnlyFallbackUndef';
my $died = !eval { "".$obj; 1 };
my $err = $@;
ok($died, "fallback of undef causes error");
# this one tries falling back to stringify before dying
like($err, qr/"""": no method found/, "correct error");
}
{
package OnlyFallbackTrue;
use overload fallback => 1;
}
{
my $obj = bless {}, 'OnlyFallbackTrue';
my $val;
my $died = !eval { $val = "".$obj; 1 };
my $err = $@;
ok(!$died, "fallback of 1 doesn't cause error")
|| diag("got error of $err");
like($val, qr/^OnlyFallbackTrue=HASH\(/, "stringified correctly");
}
}
{
# Making Regexp class overloaded: avoid infinite recursion.
# Do this in a separate process since it, well, overloads Regexp!
fresh_perl_is(
<<'EOF',
package Regexp;
use overload q{""} => sub {$_[0] };
package main;
my $r1 = qr/1/;
my $r2 = qr/ABC$r1/;
print $r2,"\n";
EOF
'(?^:ABC(?^:1))',
{ stderr => 1 },
'overloaded REGEXP'
);
}
{
# RT #121362
# splitting the stash HV while rebuilding the overload cache gave
# valgrind errors. This test code triggers such a split. It doesn't
# actually test anything; its just there for valgrind to spot
# problems.
package A_121362;
sub stringify { }
use overload '""' => 'stringify';
package B_121362;
our @ISA = qw(A_121362);
package main;
my $x = bless { }, 'B_121362';
for ('a'..'z') {
delete $B_121362::{stringify}; # delete cache entry
no strict 'refs';
*{"B_121362::$_"} = sub { }; # increase size of %B_121362
my $y = $x->{value}; # trigger cache add to %B_121362
}
pass("RT 121362");
}
package refsgalore {
use overload
'${}' => sub { \42 },
'@{}' => sub { [43] },
'%{}' => sub { { 44 => 45 } },
'&{}' => sub { sub { 46 } };
}
{
use feature 'postderef';
tell myio; # vivifies *myio{IO} at compile time
use constant ioref => bless *myio{IO}, refsgalore::;
is ioref->$*, 42, '(overloaded constant that is not a scalar ref)->$*';
is ioref->[0], 43, '(ovrld constant that is not an array ref)->[0]';
is ioref->{44}, 45, "(ovrld const that is not a hash ref)->{key}";
is ioref->(), 46, '(overloaded constant that is not a sub ref)->()';
}
package xstack { use overload 'x' => sub { shift . " x " . shift },
'""'=> sub { "xstack" } }
is join(",", 1..3, scalar((bless([], 'xstack')) x 3, 1), 4..6),
"1,2,3,1,4,5,6",
'(...)x... in void cx with x overloaded [perl #121827]';
package bitops {
our @o;
use overload do {
my %o;
for my $o (qw(& | ^ ~ &. |. ^. ~. &= |= ^= &.= |.= ^.=)) {
$o{$o} = sub {
::ok !defined $_[3], "undef (or nonexistent) arg 3 for $o";
push @o, $o, scalar @_, $_[4]//'u';
$_[0]
}
}
%o, '=' => sub { bless [] };
}
}
{
use experimental 'bitwise';
my $o = bless [], bitops::;
$_ = $o & 0;
$_ = $o | 0;
$_ = $o ^ 0;
$_ = ~$o;
$_ = $o &. 0;
$_ = $o |. 0;
$_ = $o ^. 0;
$_ = ~.$o;
$o &= 0;
$o |= 0;
$o ^= 0;
$o &.= 0;
$o |.= 0;
$o ^.= 0;
# elems are in triplets: op, length of @_, numeric? (1/u for y/n)
is "@bitops::o", '& 5 1 | 5 1 ^ 5 1 ~ 5 1 &. 3 u |. 3 u ^. 3 u ~. 3 u ' . '&= 5 1 |= 5 1 ^= 5 1 &.= 3 u |.= 3 u ^.= 3 u',
'experimental "bitwise" ops'
}
package bitops2 {
our @o;
use overload
nomethod => sub { push @o, $_[3], scalar @_, $_[4]//'u'; $_[0] },
'=' => sub { bless [] };
}
{
use experimental 'bitwise';
my $o = bless [], bitops2::;
$_ = $o & 0;
$_ = $o | 0;
$_ = $o ^ 0;
$_ = ~$o;
$_ = $o &. 0;
$_ = $o |. 0;
$_ = $o ^. 0;
$_ = ~.$o;
$o &= 0;
$o |= 0;
$o ^= 0;
$o &.= 0;
$o |.= 0;
$o ^.= 0;
# elems are in triplets: op, length of @_, numeric? (1/u for y/n)
is "@bitops2::o", '& 5 1 | 5 1 ^ 5 1 ~ 5 1 &. 4 u |. 4 u ^. 4 u ~. 4 u ' . '&= 5 1 |= 5 1 ^= 5 1 &.= 4 u |.= 4 u ^.= 4 u',
'experimental "bitwise" ops with nomethod'
}
package length_utf8 {
use overload '""' => sub { "\x{100}" };
my $o = bless [];
print length $o, "\n";
::is length($o), 1, "overloaded utf8 length";
::is "$o", "\x{100}", "overloaded utf8 value";
}
{ # undefining the overload stash -- KEEP THIS TEST LAST
package ant;
use overload '+' => 'onion';
$_ = \&overload::nil;
undef %overload::;
()=0+bless[];
::ok(1, 'no crash when undefining %overload::');
}
# test various aspects of string concat overloading, especially where
# multiple concats etc are optimised into a single multiconcat op
package Concat {
my $id;
# append a brief description of @_ to $id
sub id {
my @a = map ref $_ ? "[" . $_->[0] . "]" :
!defined $_ ? "u" :
$_,
@_;
$id .= '(' . join (',', @a) . ')';
}
use overload
'.' => sub {
id('.', @_);
my ($l, $r, $rev) = @_;
($l, $r) = map ref $_ ? $_->[0] : $_, $l, $r;
($l,$r) = ($r, $l) if $rev;
bless [ $l . $r ];
},
'.=' => sub {
id('.=', @_);
my ($l, $r, $rev) = @_;
my ($ll, $rr) = map ref $_ ? $_->[0] : $_, $l, $r;
die "Unexpected reverse in .=" if $rev;
$l->[0] .= ref $r ? $r->[0] : $r;
$l;
},
'=' => sub {
id('=', @_);
bless [ $_[0][0] ];
},
'""' => sub {
id('""', @_);
$_[0][0];
},
;
my $a = 'a';
my $b = 'b';
my $c = 'c';
my $A = bless [ 'A' ];
my $B = bless [ 'B' ];
my $C = bless [ 'C' ];
my ($r, $R);
# like cc, but with $is_ref set to 1
sub c {
my ($expr, $expect, $exp_id) = @_;
cc($expr, $expect, 1, $exp_id);
}
# eval $expr, and see if it returns $expect, and whether
# the returned value is a ref ($is_ref). Finally, check that
# $id, which has accumulated info from all overload method calls,
# matches $exp_id.
sub cc {
my ($expr, $expect, $is_ref, $exp_id) = @_;
$id = '';
$r = 'r';
$R = bless ['R'];
my $got = eval $expr;
die "eval failed: $@" if $@;
::is "$got", $expect, "expect: $expr";
::is $id, $exp_id, "id: $expr";
::is ref($got), ($is_ref ? 'Concat' : ''), "is_ref: $expr";
}
# single concats
c '$r=$A.$b', 'Ab', '(.,[A],b,)("",[Ab],u,)';
c '$r=$a.$B', 'aB', '(.,[B],a,1)("",[aB],u,)';
c '$r=$A.$B', 'AB', '(.,[A],[B],)("",[AB],u,)';
c '$R.=$a', 'Ra', '(.=,[R],a,u)("",[Ra],u,)';
c '$R.=$A', 'RA', '(.=,[R],[A],u)("",[RA],u,)';
# two concats
c '$r=$A.$b.$c', 'Abc', '(.,[A],b,)(.=,[Ab],c,u)("",[Abc],u,)';
c '$r=$A.($b.$c)', 'Abc', '(.,[A],bc,)("",[Abc],u,)';
c '$r=$a.$B.$c', 'aBc', '(.,[B],a,1)(.=,[aB],c,u)("",[aBc],u,)';
c '$r=$a.($B.$c)', 'aBc', '(.,[B],c,)(.,[Bc],a,1)("",[aBc],u,)';
c '$r=$a.$b.$C', 'abC', '(.,[C],ab,1)("",[abC],u,)';
c '$r=$a.($b.$C)', 'abC', '(.,[C],b,1)(.,[bC],a,1)("",[abC],u,)';
# two concats plus mutator
c '$r.=$A.$b.$c', 'rAbc', '(.,[A],b,)(.=,[Ab],c,u)(.,[Abc],r,1)'
.'("",[rAbc],u,)';
c '$r.=$A.($b.$c)', 'rAbc', '(.,[A],bc,)(.,[Abc],r,1)("",[rAbc],u,)';
c '$r.=$a.$B.$c', 'raBc', '(.,[B],a,1)(.=,[aB],c,u)(.,[aBc],r,1)'
.'("",[raBc],u,)';
c '$r.=$a.($B.$c)', 'raBc', '(.,[B],c,)(.,[Bc],a,1)(.,[aBc],r,1)'
.'("",[raBc],u,)';
c '$r.=$a.$b.$C', 'rabC', '(.,[C],ab,1)(.,[abC],r,1)("",[rabC],u,)';
c '$r.=$a.($b.$C)', 'rabC', '(.,[C],b,1)(.,[bC],a,1)(.,[abC],r,1)'
.'("",[rabC],u,)';
c '$R.=$A.$b.$c', 'RAbc', '(.,[A],b,)(.=,[Ab],c,u)(.=,[R],[Abc],u)'
.'("",[RAbc],u,)';
c '$R.=$A.($b.$c)', 'RAbc', '(.,[A],bc,)(.=,[R],[Abc],u)("",[RAbc],u,)';
c '$R.=$a.$B.$c', 'RaBc', '(.,[B],a,1)(.=,[aB],c,u)(.=,[R],[aBc],u)'
.'("",[RaBc],u,)';
c '$R.=$a.($B.$c)', 'RaBc', '(.,[B],c,)(.,[Bc],a,1)(.=,[R],[aBc],u)'
.'("",[RaBc],u,)';
c '$R.=$a.$b.$C', 'RabC', '(.,[C],ab,1)(.=,[R],[abC],u)("",[RabC],u,)';
c '$R.=$a.($b.$C)', 'RabC', '(.,[C],b,1)(.,[bC],a,1)(.=,[R],[abC],u)'
.'("",[RabC],u,)';
# concat over assign
c '($R.=$a).$B.$c', 'RaBc', '(.=,[R],a,u)(.,[Ra],[B],)(.=,[RaB],c,u)'
.'("",[RaBc],u,)';
::is "$R", "Ra", 'R in concat over assign';
# nested mutators
c '(($R.=$a).=$b).=$c', 'Rabc', '(.=,[R],a,u)(=,[Ra],u,)(.=,[Ra],b,u)'
. '(=,[Rab],u,)(.=,[Rab],c,u)("",[Rabc],u,)';
c '(($R.=$a).=$B).=$c', 'RaBc', '(.=,[R],a,u)(=,[Ra],u,)(.=,[Ra],[B],u)'
. '(=,[RaB],u,)(.=,[RaB],c,u)("",[RaBc],u,)';
# plain SV on both LHS and RHS with RHS object
c '$r=$r.$A.$r', 'rAr', '(.,[A],r,1)(.=,[rA],r,u)("",[rAr],u,)';
c '$r.=$r.$A.$r', 'rrAr', '(.,[A],r,1)(.=,[rA],r,u)(.,[rAr],r,1)'
.'("",[rrAr],u,)';
# object on both LHS and RHS
c '$R.=$R', 'RR', '(.=,[R],[R],u)("",[RR],u,)';
c '$R.=$R.$b.$c', 'RRbc', '(.,[R],b,)(.=,[Rb],c,u)(.=,[R],[Rbc],u)'
.'("",[RRbc],u,)';
c '$R.=$a.$R.$c', 'RaRc', '(.,[R],a,1)(.=,[aR],c,u)(.=,[R],[aRc],u)'
.'("",[RaRc],u,)';
c '$R.=$a.$b.$R', 'RabR', '(.,[R],ab,1)(.=,[R],[abR],u)("",[RabR],u,)';
# sprintf shouldn't do concat overloading
cc '$r=sprintf("%s%s%s",$a,$B,$c)', 'aBc', 0, '("",[B],u,)';
cc '$R=sprintf("%s%s%s",$a,$B,$c)', 'aBc', 0, '("",[B],u,)';
cc '$r.=sprintf("%s%s%s",$a,$B,$c)', 'raBc', 0, '("",[B],u,)';
cc '$R.=sprintf("%s%s%s",$a,$B,$c)', 'RaBc', 1, '("",[B],u,)(.=,[R],aBc,u)'
.'("",[RaBc],u,)';
# multiple constants should individually overload (RT #132385)
c '$r=$A."b"."c"', 'Abc', '(.,[A],b,)(.=,[Ab],c,u)("",[Abc],u,)';
# ... except for this
c '$R.="a"."b"', 'Rab', '(.=,[R],ab,u)("",[Rab],u,)';
}
# RT #132385
# The first arg of a reversed concat shouldn't be stringified:
# $left . $right
# where $right is overloaded, should invoke
# concat($right, $left, 1)
# rather than
# concat($right, "$left", 1)
# There's a similar issue with
# $left .= $right
# when left is overloaded
package RT132385 {
use constant C => [ "constref" ];
use overload '.' => sub {
my ($l, $r, $rev) = @_;
($l,$r) = ($r,$l) if $rev;
$l = ref $l ? $l->[0] : "$l";
$r = ref $r ? $r->[0] : "$r";
"$l-$r";
}
;
my $r1 = [ "ref1" ];
my $r2 = [ "ref2" ];
my $s1 = "str1";
my $o = bless [ "obj" ];
# try variations that will call either pp_concat or pp_multiconcat,
# with the ref as the first or a later arg
::is($r1.$o, "ref1-obj", "RT #132385 r1.o");
::is($r1.$o.$s1 , "ref1-objstr1", "RT #132385 r1.o.s1");
::is("const".$o.$s1 ,"const-objstr1", "RT #132385 const.o.s1");
::is(C.$o.$s1 ,"constref-objstr1", "RT #132385 C.o.s1");
::like($r1.$r2.$o, qr/^ARRAY\(0x\w+\)ARRAY\(0x\w+\)-obj/,
"RT #132385 r1.r2.o");
# ditto with a mutator
::is($o .= $r1, "obj-ref1", "RT #132385 o.=r1");
}
# the RHS of an overloaded .= should be passed as-is to the overload
# method, rather than being stringified or otherwise being processed in
# such a way that it triggers an undef warning
package RT132783 {
use warnings;
use overload '.=' => sub { return "foo" };
my $w = 0;
local $SIG{__WARN__} = sub { $w++ };
my $undef;
my $ov = bless [];
$ov .= $undef;
::is($w, 0, "RT #132783 - should be no warnings");
}
# changing the overloaded object to a plain string within an overload
# method should be permanent.
package RT132827 {
use overload '""' => sub { $_[0] = "a" };
my $ov = bless [];
my $b = $ov . "b";
::is(ref \$ov, "SCALAR", "RT #132827");
}
# RT #132793
# An arg like "$b" in $overloaded .= "$b" should be stringified
# before being passed to the method
package RT132793 {
my $type;
my $str = 0;
use overload
'.=' => sub { $type = ref(\$_[1]); "foo"; },
'""' => sub { $str++; "bar" };
my $a = bless {};
my $b = bless {};
$a .= "$b";
::is($type, "SCALAR", "RT #132793 type");
::is($str, 1, "RT #132793 stringify count");
}
# RT #132801
# A second RHS-not-stringified bug
package RT132801 {
my $type;
my $str = 0;
my $concat = 0;
use overload
'.' => sub { $concat++; bless []; },
'""' => sub { $str++; "bar" };
my $a = "A";
my $b = bless [];
my $c;
$c = "$a-$b";
::is($concat, 1, "RT #132801 concat count");
::is($str, 1, "RT #132801 stringify count");
}
# General testing of optimising away OP_STRINGIFY, and whether
# OP_MULTICONCAT emulates existing behaviour.
#
# It could well be argued that the existing behaviour is buggy, but
# for now emulate the old behaviour.
#
# In more detail:
#
# Since 5.000, any OP_STRINGIFY immediately following an OP_CONCAT
# is optimised away, on the assumption that since concat will always
# return a valid string anyway, it doesn't need stringifying.
# So in "$x", the stringify is needed, but on "$x$y" it isn't.
# This assumption is flawed once overloading has been introduced, since
# concat might return an overloaded object which still needs stringifying.
# However, this flawed behaviour is apparently needed by at least one
# module, and is tested for in opbasic/concat.t: see RT #124160.
#
# There is also a wart with the OPpTARGET_MY optimisation: specifically,
# in $lex = "...", if $lex is a lexical var, then a chain of 2 or more
# concats *doesn't* optimise away OP_STRINGIFY:
#
# $lex = "$x"; # stringifies
# $lex = "$x$y"; # doesn't stringify
# $lex = "$x$y$z..."; # stringifies
package Stringify {
my $count;
use overload
'.' => sub {
my ($a, $b, $rev) = @_;
bless [ $rev ? "$b" . $a->[0] : $a->[0] . "$b" ];
},
'""' => sub { $count++; $_[0][0] },
;
for my $test(
[ 1, '$pkg = "$ov"' ],
[ 1, '$lex = "$ov"' ],
[ 1, 'my $a = "$ov"' ],
[ 1, '$pkg .= "$ov"' ],
[ 1, '$lex .= "$ov"' ],
[ 1, 'my $a .= "$ov"' ],
[ 0, '$pkg = "$ov$x"' ],
[ 0, '$lex = "$ov$x"' ],
[ 0, 'my $a = "$ov$x"' ],
[ 0, '$pkg .= "$ov$x"' ],
[ 0, '$lex .= "$ov$x"' ],
[ 0, 'my $a .= "$ov$x"' ],
[ 0, '$pkg = "$ov$x$y"' ],
[ 1, '$lex = "$ov$x$y"' ], # XXX note the anomaly
[ 0, 'my $a = "$ov$x$y"' ],
[ 0, '$pkg .= "$ov$x$y"' ],
[ 0, '$lex .= "$ov$x$y"' ],
[ 0, 'my $a .= "$ov$x$y"' ],
)
{
my ($stringify, $code) = @$test;
our $pkg = 'P';
my ($ov, $x, $y, $lex) = (bless(['OV']), qw(X Y L));
$count = 0;
eval "$code; 1" or die $@;
::is $count, $stringify, $code;
}
}
# RT #133789: in multiconcat with overload, the overloaded ref returned
# from the overload method was being assigned to the pad targ, causing
# a delay to the freeing of the object
package RT33789 {
use overload
'.' => sub { $_[0] }
;
my $destroy = 0;
sub DESTROY { $destroy++ }
{
my $o = bless [];
my $result = '1' . ( '2' . ( '3' . ( '4' . ( '5' . $o ) ) ) );
}
::is($destroy, 1, "RT #133789: delayed destroy");
}
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment