use v6-alpha;

use Test;

=kwid

Array refs

=cut

plan 45;

# array_ref of strings

my $array_ref1 = ("foo", "bar", "baz");
isa_ok($array_ref1, 'Array');

is(+$array_ref1, 3, 'the array_ref1 has 3 elements');
is($array_ref1[0], 'foo', 'got the right value at array_ref1 index 0');
is($array_ref1[1], 'bar', 'got the right value at array_ref1 index 1');
is($array_ref1[2], 'baz', 'got the right value at array_ref1 index 2');

is($array_ref1.[0], 'foo', 'got the right value at array_ref1 index 0 using the . notation');

# array_ref with strings, numbers and undef

my $array_ref2 = [ "test", 1, undef ];
isa_ok($array_ref2, 'Array');

is(+$array_ref2, 3, 'the array_ref2 has 3 elements');
is($array_ref2[0], 'test', 'got the right value at array_ref2 index 0');
is($array_ref2[1], 1,      'got the right value at array_ref2 index 1');
is($array_ref2[2], undef,  'got the right value at array_ref2 index 2');

# array_ref slice

# NOTE:
# the [] creation must be forced here, because $array_ref<n> = is
# not seen as array_ref context, because it's not

my $array_ref4 = [ $array_ref2[2, 1, 0] ];
isa_ok($array_ref4, 'Array');

is(+$array_ref4, 3, 'the array_ref4 has 3 elements');
is($array_ref4[0], undef,  'got the right value at array_ref4 index 0');
is($array_ref4[1], 1,      'got the right value at array_ref4 index 1');
is($array_ref4[2], 'test', 'got the right value at array_ref4 index 2');

# create new array_ref with 2 array_ref slices

my $array_ref5 = [ $array_ref2[2, 1, 0], $array_ref1[2, 1, 0] ];
isa_ok($array_ref5, 'Array');

is(+$array_ref5, 6, 'the array_ref5 has 6 elements');
is($array_ref5[0], undef,  'got the right value at array_ref5 index 0');
is($array_ref5[1], 1,      'got the right value at array_ref5 index 1');
is($array_ref5[2], 'test', 'got the right value at array_ref5 index 2');
is($array_ref5[3], 'baz',  'got the right value at array_ref5 index 3');
is($array_ref5[4], 'bar',  'got the right value at array_ref5 index 4');
is($array_ref5[5], 'foo',  'got the right value at array_ref5 index 5');

# create an array_ref slice with an array_ref (in a variable)

my $slice = [ 2, 0, 1 ];
my $array_ref6 = [ $array_ref1[@$slice] ];
isa_ok($array_ref6, 'Array');

is(+$array_ref6, 3, 'the array_ref6 has 3 elements');
is($array_ref6[0], 'baz', 'got the right value at array_ref6 index 0');
is($array_ref6[1], 'foo', 'got the right value at array_ref6 index 1');
is($array_ref6[2], 'bar', 'got the right value at array_ref6 index 2');

# create an array_ref slice with an array_ref constructed with []

my $array_ref7 = [ $array_ref1[(2, 1, 0)] ];
isa_ok($array_ref7, 'Array');

is(+$array_ref7, 3, 'the array_ref7 has 3 elements');
is($array_ref7[0], 'baz', 'got the right value at array_ref7 index 0');
is($array_ref7[1], 'bar', 'got the right value at array_ref7 index 1');
is($array_ref7[2], 'foo', 'got the right value at array_ref7 index 2');

my $array_ref8 = [ 1, 2, 3, ];
is(+$array_ref8, 3, "trailing commas make correct array");

# recursive array
my $array9 = [42, "nothing"];
$array9[1] = $array9;
isa_ok $array9,             "Array";
isa_ok $array9[1],          "Array";
is     $array9[0],          42, "recursive array access (0)";
is     $array9[1][0],       42, "recursive array access (1)";
is     $array9[1][1][0],    42, "recursive array access (2)";
is     $array9[1][1][1][0], 42, "recursive array access (3)";

# changing nested array
my $array10 = [[2]];
is try { $array10[0][0] = 6; $array10[0][0] }, 6, "changing nested array (1)";
my $array11 = [[2,3]];
is try { $array11[0][0] = 6; $array11[0][0] }, 6, "changing nested array (2)";

# creating a AoA using ";" doesn't work any longer
# As of L<"http://www.nntp.perl.org/group/perl.perl6.language/20795">:
#   In ordinary list context, infix:<;> is just a list-op-ending "big comma",
#   but is otherwise treated like an ordinary comma (but only if the
#   list is in some kind of brackets, of course).
#my $array11;
#eval '$array11 = [ "a","b","c"; "d","e","f" ]';
#is +$array11,      2, "AoA created using ';' contains correct number of elems", :todo;
#is +$array11[0],   3, "AoA's subarray created using ';' contains correct number of elems", :todo;
#is $array11[1][1], "e", "AoA created using ';' contains correct elem", :todo;

# [] creates new containers (() does not)
{
  my $foo;
  ok !([$foo][0] =:= $foo), "creating arrays using [] creates new containers (1)";
}

{
  my $foo;
  my $arrayref = [$foo];
  ok !($arrayref[0] =:= $foo), "creating arrays using [] creates new containers (2)";
}