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use v6;
use lib 't/spec/packages';
use Test;
use Test::Util;
=begin pod
'Mu' and 'undefine' tests
This test file contains two sections: a port of the perl5 'undef.t' tests, and
perl6-specific tests.
=end pod
# Note: See thread "Undef issues" by Adrian Taylor on p6l
# L<http://groups.google.com/groups?threadm=20050601002444.GB32060@wall.org>
# On Tue, May 24, 2005 at 10:53:59PM +1000, Stuart Cook wrote:
# : I'm not sure whether this behaviour is supposed to be changing.
#
# It is. I think we decided to make the value undef, and the function
# undefine(). (But these days most values of undef really ought to
# be constructed and returned (or thrown) using fail().)
#
# Larry
plan 91;
our $GLOBAL;
# L<S32::Basics/Mu/=item defined>
ok(!defined(Mu), "Mu is not defined");
{
my $a;
ok(!defined($a), "uninitialized lexicals are undefined");
ok(!defined($GLOBAL), "uninitialized package vars are undefined");
$a += 1;
ok(defined($a), "initialized var is defined");
is_run( 'my $a; $a += 1', { err => '', out => '', status => 0 },
'increment of undefined variable does not warn' );
undefine $a;
ok(!defined($a), 'undefine($a) does');
$a = "hi";
ok(defined($a), "string");
my $b;
$a = $b;
ok(!defined($a), "assigning another undefined lexical");
$a = $GLOBAL;
ok(!defined($a), "assigning another undefined global");
}
# L<S32::Basics/Mu/"=item undefine">
{
my @ary = "arg1";
my $a = @ary.pop;
ok(defined($a), "pop from array");
$a = @ary.pop;
ok(!defined($a), "pop from empty array");
@ary = "arg1";
$a = @ary.shift;
ok(defined($a), "shift from array");
$a = @ary.shift;
ok(!defined($a), "shift from empty array");
my %hash = ( bar => 'baz', quux => 'quuz' );
ok(defined(%hash<bar>), "hash subscript");
ok(!defined(%hash<bargho>), "non-existent hash subscript");
undefine %hash<bar>;
ok(!defined(%hash<bar>), "undefine hash subscript");
%hash<bar> = "baz";
%hash<bar>:delete;
ok(!defined(%hash<bar>), "delete hash subscript");
ok(defined(@ary), "aggregate array defined");
ok(defined(%hash), "aggregate hash defined");
undefine(@ary);
#?rakudo todo 'definedness of array RT #124563'
ok(!defined(@ary), "undefine array");
undefine(%hash);
#?rakudo todo 'definedness of hash RT #124564'
ok(!defined(%hash), "undefine hash");
@ary = (1);
ok(defined(@ary), "define array again");
%hash = (1,1);
ok(defined(%hash), "define hash again");
}
#?rakudo skip 'access to &your_sub RT #124565'
{
sub a_sub { "møøse" }
ok(defined(&a_sub), "defined sub");
ok(EVAL('defined(%«$?PACKAGE\::»<&a_sub>)'), "defined sub (symbol table)");
ok(EVAL('!defined(&a_subwoofer)'), "undefined sub");
ok(EVAL('!defined(%«$?PACKAGE\::»<&a_subwoofer>)'), "undefined sub (symbol table)");
dies-ok { undefine &a_sub }, 'die trying to undefine a sub';
ok defined &a_sub, 'sub is still defined after attempt to undefine';
}
# TODO: find a read-only value to try and assign to, since we don't
# have rules right now to play around with (the p5 version used $1)
#EVAL { "constant" = "something else"; };
#is($!, "Modification of a read", "readonly write yields exception");
# skipped tests for tied things
# skipped test for attempt to undef a bareword -- no barewords here.
# TODO: p5 "bugid 3096
# undefing a hash may free objects with destructors that then try to
# modify the hash. To them, the hash should appear empty."
# Test LHS assignment to undef:
# XXX shouldn't that be * instead of undef?
# yes, this chunk should move to a different file --Larry
{
my $interesting;
(*, *, $interesting) = (1,2,3);
is($interesting, 3, "Undef on LHS of list assignment");
(*, $interesting, *) = (1,2,3);
is($interesting, 2, "Undef on LHS of list assignment");
($interesting, *, *) = (1,2,3);
is($interesting, 1, "Undef on LHS of list assignment");
sub two_elements() { (1,2) };
(*,$interesting) = two_elements();
is($interesting, 2, "Undef on LHS of function assignment");
($interesting, *) = two_elements();
is($interesting, 1, "Undef on LHS of function assignment");
}
=begin pod
Perl6-specific tests
=end pod
{
# aggregate references
my @ary = (<a b c d e>);
my $ary_r = @ary; # ref
isa-ok($ary_r, Array);
ok(defined($ary_r), "array reference");
undefine @ary;
ok(!+$ary_r, "undefine array referent");
is(+$ary_r, 0, "dangling array reference");
my %hash = (1, 2, 3, 4);
my $hash_r = %hash;
isa-ok($hash_r, "Hash");
ok(defined($hash_r), "hash reference");
undefine %hash;
ok(defined($hash_r), "undefine hash referent:");
is(+$hash_r.keys, 0, "dangling hash reference");
}
{
my Array $an_ary;
ok(!defined($an_ary), "my Array");
nok( defined($an_ary[0]) , "my Array subscript - Mu");
$an_ary.push("blergh");
ok(defined($an_ary.pop), "push");
nok(defined($an_ary.pop), "comes to shove");
}
{
my Hash $a_hash;
nok(defined($a_hash), "my Hash");
nok(defined($a_hash<blergh>), "my Hash subscript - Mu");
nok(defined($a_hash<blergh>), "my Hash subscript - Mu, no autovivification happened");
$a_hash<blergh> = 1;
ok(defined($a_hash<blergh>:delete), "delete");
nok(defined($a_hash<blergh>:delete), " - once only");
}
{
class Dog {};
my Dog $spot;
ok(!defined($spot), "Unelaborated mutt");
$spot .= new;
ok(defined($spot), " - now real");
}
# rules
# TODO. refer to S05
# L<S05/Match objects/"they will all be undefined" closure
# "let keyword">
# - unmatched alternative should bind to undef
#?rakudo skip 'Cannot use bind operator with this left-hand side RT #124566'
#?DOES 10
{
my ($num, $alpha);
my ($rx1, $rx2); #OK not used
EVAL '
$rx1 = rx
/ [ (\d+) { let $<num> := $0 }
| (<alpha>+) { let $<alpha> := $1 }
]
/;
$rx2 = rx
/ [ $<num> := (\d+)
| $<alpha>:= (<alpha>+)
]
/;
';
for (<rx1 rx2>) {
# I want symbolic lookups because I need the rx names for test results.
EVAL '"1" ~~ %MY::{$_}';
ok(defined($num), '{$_}: successful hypothetical');
ok(!defined($alpha), '{$_}: failed hypothetical');
EVAL '"A" ~~ %MY::{$_}';
ok(!defined($num), '{$_}: failed hypothetical (2nd go)');
ok(defined($alpha), '{$_}: successful hypothetical (2nd go)');
}
# - binding to hash keys only would leave values undefined
EVAL '"a=b\nc=d\n" ~~ / $<matches> := [ (\w) = \N+ ]* /';
ok(EVAL('$<matches> ~~ all(<a b>)'), "match keys exist");
#ok(!defined($<matches><a>) && !defined($<matches><b>), "match values don't");
ok(0 , "match values don't");
}
#?DOES 1
{
# - $0, $1 etc. should all be undefined after a failed match
# (except for special circumstances)
"abcde" ~~ /(.)(.)(.)/;
"abcde" ~~ /(\d)/;
ok((!try { grep { defined($_) }, ($0, $1, $2, $3, $4, $5) }),
"all submatches undefined after failed match") or
diag("match state: " ~ EVAL '$/');
# XXX write me: "special circumstances"
}
# subroutines
{
sub bar ($bar, $baz?, :$quux) {
is($bar, "BAR", "defined param"); # sanity
# L<S06/Optional parameters/Missing optional arguments>
ok(!defined($baz), "unspecified optional param");
# L<S06/Named parameters/Named parameters are optional>
ok(!defined($quux), "unspecified optional param");
}
bar("BAR");
}
# autoloading
# L<S10/Autoloading>
# Currently waiting on
# - packages
# - symtable hash
# - autoloading itself
# Extra tests added due to apparent bugs
is((Any) + 1, 1, 'Any + 1');
is(1 + (Any), 1, '1 + Any');
is((Any) * 2, 0, 'Any * 2');
is(2 * (Any), 0, '2 * Any');
is-deeply([(Any) xx 2], [Any, Any], 'Any xx 2');
is((Any) * (Any), 0, 'Any * Any');
lives-ok { uc(EVAL("")) }, 'can use EVAL("") in further expressions';
{
sub lie { Bool::False }
ok lie() ~~ Bool, 'sub returns a bool';
dies-ok { undefine lie }, 'attempt to undefine returned Bool type dies';
ok lie() ~~ Bool, 'sub still returns a bool';
}
{
sub def is rw { my $x = [] } #OK not used
ok def() ~~ Array, 'sub returns array';
lives-ok { undefine def }, 'attempt to undefine returned array lives';
ok def() ~~ Array, 'sub still returns array';
dies-ok { undefine &def }, 'attempt to undefine sub dies';
ok defined(&def), 'attempt to undefine sub fails';
ok def() ~~ Array, 'can still call sub after attempt to undefine it';
}
# RT #69238
{
sub foo { my $a = "baz"; undefine $a; undefine $a; $a; }
ok !defined(foo()), 'can undefine $a twice without any troubles';
}
# RT #117777
{
my $a = "foo";
undefine($a) = "bar";
is $a, "bar", "undefine is rw";
my $b = my $c = my $d is default(42) = "foo";
{
undefine temp $b;
temp undefine($c);
temp undefine($d) = "baz";
is $b, Any, "Can undefine temp \$var";
is $c, Any, "Can temp undefine \$var";
is $d, "baz", "Can temp undefine \$var + assignment";
}
is $b, "foo", "temp restores value before undefine";
is $c, Any, "temp restores value after undefine";
is $d, 42, "temp restore default value after undefine";
}
# vim: ft=perl6