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|
#!./perl -w
BEGIN {
chdir 't' if -d 't';
@INC = '../lib';
require './test.pl';
}
use strict;
tie my $c => 'Tie::Monitor';
sub expected_tie_calls {
my ($obj, $rexp, $wexp, $tn) = @_;
local $::Level = $::Level + 1;
my ($rgot, $wgot) = $obj->init();
is ($rgot, $rexp, $tn ? "number of fetches when $tn" : ());
is ($wgot, $wexp, $tn ? "number of stores when $tn" : ());
}
# Use ok() instead of is(), cmp_ok() etc, to strictly control number of accesses
my($r, $s);
ok($r = $c + 0 == 0, 'the thing itself');
expected_tie_calls(tied $c, 1, 0);
ok($r = "$c" eq '0', 'the thing itself');
expected_tie_calls(tied $c, 1, 0);
ok($c . 'x' eq '0x', 'concat');
expected_tie_calls(tied $c, 1, 0);
ok('x' . $c eq 'x0', 'concat');
expected_tie_calls(tied $c, 1, 0);
$s = $c . $c;
ok($s eq '00', 'concat');
expected_tie_calls(tied $c, 2, 0);
$r = 'x';
$s = $c = $r . 'y';
ok($s eq 'xy', 'concat');
expected_tie_calls(tied $c, 1, 1);
$s = $c = $c . 'x';
ok($s eq '0x', 'concat');
expected_tie_calls(tied $c, 2, 1);
$s = $c = 'x' . $c;
ok($s eq 'x0', 'concat');
expected_tie_calls(tied $c, 2, 1);
$s = $c = $c . $c;
ok($s eq '00', 'concat');
expected_tie_calls(tied $c, 3, 1);
$s = chop($c);
ok($s eq '0', 'multiple magic in core functions');
expected_tie_calls(tied $c, 1, 1);
$c = *strat;
$s = $c;
ok($s eq *strat,
'Assignment should not ignore magic when the last thing assigned was a glob');
expected_tie_calls(tied $c, 1, 1);
package o { use overload '""' => sub { "foo\n" } }
$c = bless [], o::;
chomp $c;
expected_tie_calls(tied $c, 1, 2, 'chomping a ref');
{
my $outfile = tempfile();
open my $h, ">$outfile" or die "$0 cannot close $outfile: $!";
print $h "bar\n";
close $h or die "$0 cannot close $outfile: $!";
$c = *foo; # 1 write
open $h, $outfile;
sysread $h, $c, 3, 7; # 1 read; 1 write
is $c, "*main::bar", 'what sysread wrote'; # 1 read
expected_tie_calls(tied $c, 2, 2, 'calling sysread with tied buf');
close $h or die "$0 cannot close $outfile: $!";
# Do this again, with a utf8 handle
$c = *foo; # 1 write
open $h, "<:utf8", $outfile;
sysread $h, $c, 3, 7; # 1 read; 1 write
is $c, "*main::bar", 'what sysread wrote'; # 1 read
expected_tie_calls(tied $c, 2, 2, 'calling sysread with tied buf');
close $h or die "$0 cannot close $outfile: $!";
unlink_all $outfile;
}
# autovivication of aelem, helem, of rv2sv combined with get-magic
{
my $true = 1;
my $s;
tie $$s, "Tie::Monitor";
$$s = undef;
$$s->[0] = 73;
is($$s->[0], 73);
expected_tie_calls(tied $$s, 3, 2);
my @a;
tie $a[0], "Tie::Monitor";
$a[0] = undef;
$a[0][0] = 73;
is($a[0][0], 73);
expected_tie_calls(tied $a[0], 3, 2);
my %h;
tie $h{foo}, "Tie::Monitor";
$h{foo} = undef;
$h{foo}{bar} = 73;
is($h{foo}{bar}, 73);
expected_tie_calls(tied $h{foo}, 3, 2);
# Similar tests, but with obscured autovivication by using dummy list or "?:" operator
$$s = undef;
${ (), $$s }[0] = 73;
is( $$s->[0], 73);
expected_tie_calls(tied $$s, 3, 2);
$$s = undef;
( ! $true ? undef : $$s )->[0] = 73;
is( $$s->[0], 73);
expected_tie_calls(tied $$s, 3, 2);
$$s = undef;
( $true ? $$s : undef )->[0] = 73;
is( $$s->[0], 73);
expected_tie_calls(tied $$s, 3, 2);
}
# A plain *foo should not call get-magic on *foo.
# This method of scalar-tying an immutable glob relies on details of the
# current implementation that are subject to change. This test may need to
# be rewritten if they do change.
my $tyre = tie $::{gelp} => 'Tie::Monitor';
# Compilation of this eval autovivifies the *gelp glob.
eval '$tyre->init(0); () = \*gelp';
my($rgot, $wgot) = $tyre->init(0);
ok($rgot == 0, 'a plain *foo causes no get-magic');
ok($wgot == 0, 'a plain *foo causes no set-magic');
# get-magic when exiting a non-lvalue sub in potentially autovivify-
# ing context
{
no strict;
my $tied_to = tie $_{elem}, "Tie::Monitor";
() = sub { delete $_{elem} }->()->[3];
expected_tie_calls $tied_to, 1, 0,
'mortal magic var is implicitly returned in autoviv context';
$tied_to = tie $_{elem}, "Tie::Monitor";
() = sub { return delete $_{elem} }->()->[3];
expected_tie_calls $tied_to, 1, 0,
'mortal magic var is explicitly returned in autoviv context';
$tied_to = tie $_{elem}, "Tie::Monitor";
my $rsub;
$rsub = sub { if ($_[0]) { delete $_{elem} } else { &$rsub(1)->[3] } };
&$rsub;
expected_tie_calls $tied_to, 1, 0,
'mortal magic var is implicitly returned in recursive autoviv context';
$tied_to = tie $_{elem}, "Tie::Monitor";
$rsub = sub {
if ($_[0]) { return delete $_{elem} } else { &$rsub(1)->[3] }
};
&$rsub;
expected_tie_calls $tied_to, 1, 0,
'mortal magic var is explicitly returned in recursive autoviv context';
$tied_to = tie $_{elem}, "Tie::Monitor";
my $x = \sub { delete $_{elem} }->();
expected_tie_calls $tied_to, 1, 0,
'mortal magic var is implicitly returned to refgen';
is tied $$x, undef,
'mortal magic var is copied when implicitly returned';
$tied_to = tie $_{elem}, "Tie::Monitor";
$x = \sub { return delete $_{elem} }->();
expected_tie_calls $tied_to, 1, 0,
'mortal magic var is explicitly returned to refgen';
is tied $$x, undef,
'mortal magic var is copied when explicitly returned';
}
done_testing();
# adapted from Tie::Counter by Abigail
package Tie::Monitor;
sub TIESCALAR {
my($class, $value) = @_;
bless {
read => 0,
write => 0,
values => [ 0 ],
};
}
sub FETCH {
my $self = shift;
++$self->{read};
$self->{values}[$#{ $self->{values} }];
}
sub STORE {
my($self, $value) = @_;
++$self->{write};
push @{ $self->{values} }, $value;
}
sub init {
my $self = shift;
my @results = ($self->{read}, $self->{write});
$self->{read} = $self->{write} = 0;
$self->{values} = [ 0 ];
@results;
}
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