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#!./perl -w
BEGIN {
chdir 't' if -d 't';
require './test.pl';
set_up_inc('../lib');
}
# use strict;
plan tests => 38;
# simple use cases
{
my @a = 'a'..'z';
is( join(':', %a[0,1,2]), '0:a:1:b:2:c', "correct result and order");
is( join(':', %a[2,1,0]), '2:c:1:b:0:a', "correct result and order");
is( join(':', %a[1,0,2]), '1:b:0:a:2:c', "correct result and order");
ok( eq_hash( { %a[5,6] }, { 5 => 'f', 6 => 'g' } ), "correct hash" );
is( join(':', %a[()]), '', "correct result for empty slice");
}
# not existing elements
{
my @a = 'a'..'d';
ok( eq_hash( { %a[3..4] }, { 3 => 'd', 4 => undef } ),
"not existing returned with undef value" );
ok( !exists $a[5], "no autovivification" );
}
# repeated keys
{
my @a = 'a'..'d';
@a = %a[ (1) x 3 ];
ok eq_array( \@a, [ (1 => 'b') x 3 ]), "repetead keys end with repeated results";
}
# scalar context
{
my @warn;
local $SIG{__WARN__} = sub {push @warn, "@_"};
my @a = 'a'..'z';
is eval'scalar %a[4,5,6]', 'g', 'last element in scalar context';
like ($warn[0],
qr/^\%a\[\.\.\.\] in scalar context better written as \$a\[\.\.\.\]/);
eval 'is( scalar %a[5], "f", "correct value");';
is (scalar @warn, 2);
like ($warn[1], qr/^\%a\[5\] in scalar context better written as \$a\[5\]/);
}
# autovivification
{
my @a = 'a'..'b';
my @t = %a[1,2];
is( join(':', map {$_//'undef'} @t), '1:b:2:undef', "correct result");
ok( eq_array( \@a, ['a', 'b'] ), "correct array" );
}
# refs
{
my $a = [ 'a'..'z' ];
is( join(':', %$a[2,3,4]), '2:c:3:d:4:e', "correct result and order");
is( join(':', %{$a}[2,3,4]), '2:c:3:d:4:e', "correct result and order");
}
# no interpolation
{
my @a = 'a'..'b';
is( "%a[1,2]", q{%a[1,2]}, 'no interpolation within strings' );
}
# ref of a slice produces list
{
my @a = 'a'..'z';
my @tmp = \%a[2,3,4];
my $ok = 1;
$ok = 0 if grep !ref, @tmp;
ok $ok, "all elements are refs";
is join( ':', map{ $$_ } @tmp ), '2:c:3:d:4:e';
}
# lvalue usage in foreach
{
my @a = qw(0 1 2 3);
my @i = (1,3);
$_++ foreach %a[@i];
ok( eq_array( \@a, [0,2,2,4] ), "correct array" );
ok( eq_array( \@i, [1,3] ), "indexes not touched" );
}
# lvalue subs in foreach
{
my @a = qw(0 1 2 3);
my @i = (1,3);
sub foo:lvalue{ %a[@i] };
$_++ foreach foo();
ok( eq_array( \@a, [0,2,2,4] ), "correct array" );
ok( eq_array( \@i, [1,3] ), "indexes not touched" );
}
# errors
{
my @a = 'a'..'b';
# no local
{
local $@;
eval 'local %a[1,2]';
like $@, qr{^Can't modify index/value array slice in local at},
'local dies';
}
# no assign
{
local $@;
eval '%a[1,2] = qw(B A)';
like $@, qr{^Can't modify index/value array slice in list assignment},
'assign dies';
}
# lvalue subs in assignment
{
local $@;
eval 'sub bar:lvalue{ %a[1,2] }; bar() = "1"';
like $@, qr{^Can't modify index/value array slice in list assignment},
'not allowed as result of lvalue sub';
}
}
# warnings
{
my @warn;
local $SIG{__WARN__} = sub {push @warn, "@_"};
my @a = 'a'..'c';
{
@warn = ();
my $v = eval '%a[0]';
is (scalar @warn, 1, 'warning in scalar context');
like $warn[0],
qr{^%a\[0\] in scalar context better written as \$a\[0\]},
"correct warning text";
}
{
@warn = ();
my ($k,$v) = eval '%a[0]';
is ($k, 0);
is ($v, 'a');
is (scalar @warn, 0, 'no warning in list context');
}
}
# simple case with tied
{
require Tie::Array;
tie my @a, 'Tie::StdArray';
@a = 'a'..'c';
ok( eq_array( [%a[1,2, 3]], [qw(1 b 2 c 3), undef] ),
"works on tied" );
ok( !exists $a[3], "no autovivification" );
}
# keys/value/each refuse to compile kvaslice
{
my %h = 'a'..'b';
my @i = \%h;
eval '() = keys %i[(0)]';
like($@, qr/Experimental keys on scalar is now forbidden/,
'keys %array[ix] forbidden');
eval '() = values %i[(0)]';
like($@, qr/Experimental values on scalar is now forbidden/,
'values %array[ix] forbidden');
eval '() = each %i[(0)]';
like($@, qr/Experimental each on scalar is now forbidden/,
'each %array[ix] forbidden');
}
# \% prototype expects hash deref
sub nowt_but_hash(\%) {}
eval 'nowt_but_hash %_[0]';
like $@, qr`^Type of arg 1 to main::nowt_but_hash must be hash \(not(?x:
) index/value array slice\) at `,
'\% prototype';
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