path: root/gnu/usr.bin/perl/t/op/repeat.t

#!./perl

BEGIN {
    chdir 't' if -d 't';
    require './test.pl';
    set_up_inc( '../lib' );
}

plan(tests => 50);

# compile time

is('-' x 5, '-----',    'compile time x');
is('-' x 3.1, '---',    'compile time 3.1');
is('-' x 3.9, '---',    'compile time 3.9');
is('-' x 1, '-',        '  x 1');
is('-' x 0, '',         '  x 0');
is('-' x -1, '',        '  x -1');
is('-' x undef, '',     '  x undef');
is('-' x "foo", '',     '  x "foo"');
is('-' x "3rd", '---',  '  x "3rd"');

is('ab' x 3, 'ababab',  '  more than one char');

# run time

$a = '-';
is($a x 5, '-----',     'run time x');
is($a x 3.1, '---',     '  x 3.1');
is($a x 3.9, '---',     '  x 3.9');
is($a x 1, '-',         '  x 1');
is($a x 0, '',          '  x 0');
is($a x -3, '',         '  x -3');
is($a x undef, '',      '  x undef');
is($a x "foo", '',      '  x "foo"');
is($a x "3rd", '---',   '  x "3rd"');

$a = 'ab';
is($a x 3, 'ababab',    '  more than one char');
$a = 'ab';
is($a x 0, '',          '  more than one char');
$a = 'ab';
is($a x -12, '',        '  more than one char');

$a = 'xyz';
$a x= 2;
is($a, 'xyzxyz',        'x=2');
$a x= 1;
is($a, 'xyzxyz',        'x=1');
$a x= 0;
is($a, '',              'x=0');

@x = (1,2,3);

is(join('', @x x 4),        '3333',                 '@x x Y');
is(join('', (@x) x 4),      '123123123123',         '(@x) x Y');
is(join('', (@x,()) x 4),   '123123123123',         '(@x,()) x Y');
is(join('', (@x,1) x 4),    '1231123112311231',     '(@x,1) x Y');
is(join(':', () x 4),       '',                     '() x Y');
is(join(':', (9) x 4),      '9:9:9:9',              '(X) x Y');
is(join(':', (9,9) x 4),    '9:9:9:9:9:9:9:9',      '(X,X) x Y');
is(join('', (split(//,"123")) x 2), '123123',       'split and x');

is(join('', @x x -12),      '',                     '@x x -12');
is(join('', (@x) x -14),    '',                     '(@x) x -14');

($a, (undef)x5, $b) = 1..10;
is ("$a $b", "1 7", '(undef)xCONST on lhs of list assignment');
(($a)x3,$b) = 1..10;
is ("$a, $b", "3, 4", '($x)xCONST on lhs of list assignment');
($a, (undef)x${\6}, $b) = "a".."z";
is ("$a$b", "ah", '(undef)x$foo on lhs of list assignment');


# This test is actually testing for Digital C compiler optimizer bug,
# present in Dec C versions 5.* and 6.0 (used in Digital UNIX and VMS),
# found in December 1998.  The bug was reported to Digital^WCompaq as
#     DECC 2745 (21-Dec-1998)
# GEM_BUGS 7619 (23-Dec-1998)
# As of April 1999 the bug has been fixed in Tru64 UNIX 5.0 and is planned
# to be fixed also in 4.0G.
#
# The bug was as follows: broken code was produced for util.c:repeatcpy()
# (a utility function for the 'x' operator) in the case *all* these
# four conditions held:
#
# (1) len == 1
# (2) "from" had the 8th bit on in its single character
# (3) count > 7 (the 'x' count > 16)
# (4) the highest optimization level was used in compilation
#     (which is the default when compiling Perl)
#
# The bug looked like this (. being the eight-bit character and ? being \xff):
#
# 16 ................
# 17 .........???????.
# 18 .........???????..
# 19 .........???????...
# 20 .........???????....
# 21 .........???????.....
# 22 .........???????......
# 23 .........???????.......
# 24 .........???????.???????
# 25 .........???????.???????.
#
# The bug was triggered in the "if (len == 1)" branch.  The fix
# was to introduce a new temporary variable.  In diff -u format:
#
#     register char *frombase = from;
# 
#     if (len == 1) {
#-       todo = *from;
#+       register char c = *from;
#        while (count-- > 0)
#-           *to++ = todo;
#+           *to++ = c;
#        return;
#     }
#
# The bug could also be (obscurely) avoided by changing "from" to
# be an unsigned char pointer.
#
# This obscure bug was not found by the then test suite but instead
# by Mark.Martinec@nsc.ijs.si while trying to install Digest-MD5-2.00.
#
# jhi@iki.fi
#
is("\xdd" x 24, "\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd", 'Dec C bug');


# When we use a list repeat in a scalar context, it behaves like
# a scalar repeat. Make sure that works properly, and doesn't leave
# extraneous values on the stack.
#  -- robin@kitsite.com

my ($x, $y) = scalar ((1,2)x2);
is($x, "22",    'list repeat in scalar context');
is($y, undef,   '  no extra values on stack');

# Make sure the stack doesn't get truncated too much - the first
# argument to is() needs to remain!
is(77, scalar ((1,7)x2),    'stack truncation');

# ( )x in void context should not read preceding stack items
package Tiecount {
    sub TIESCALAR { bless[]} sub FETCH { our $Tiecount++; study; 3 }
}
sub nil {}
tie my $t, "Tiecount";
{ push my @temp, $t, scalar((nil) x 3, 1) }
is($Tiecount::Tiecount, 1,
   '(...)x... in void context in list (via scalar comma)');


# perlbug 20011113.110 (#7902) works in 5.6.1, broken in 5.7.2
{
    my $x= [("foo") x 2];
    is( join('', @$x), 'foofoo', 'list repeat in anon array ref broken [ID 20011113.110 (#7902)]' );
}

# [perl #35885]
is( (join ',', (qw(a b c) x 3)), 'a,b,c,a,b,c,a,b,c', 'x on qw produces list' );

# [perl #78194] x aliasing op return values
sub {
    is(\$_[0], \$_[1],
      '[perl #78194] \$_[0] == \$_[1] when @_ aliases elems repeated by x')
}
 ->(("${\''}")x2);

$#that_array = 7;
for(($#that_array)x2) {
    $_ *= 2;
}
is($#that_array, 28, 'list repetition propagates lvalue cx to its lhs');

# [perl #126309] huge list counts should give an error


fresh_perl_like(
 '@a = (1) x ~1',
  qr/Out of memory/,
  {  },
 '(1) x ~1',
);

# [perl #130247] Perl_rpeep(OP *): Assertion `oldop' failed
# 
# the 'x 0' optimising code in rpeep didn't expect the repeat expression
# to occur on the op_other side of an op_next chain.
# This used to give an assertion failure

eval q{() = (() or ((0) x 0)); 1};
is($@, "", "RT #130247");

# yes, the newlines matter
fresh_perl_is(<<'PERL', "", { stderr => 1 }, "(perl #133778) MARK mishandling");
map{s[][];eval;0}<DATA>__END__

















































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PERL