use v6-alpha;

use Test;

plan 58;

# L<S02/Names and Variables/appropriate adverb to the subscript>

# Adverbs on array subscripts
# :p
{
    my @array = <A B>;

    isa_ok eval('@array[0]:p'), Pair,
        ":p on an array returned a Pair", :todo<feature>;
    is ~eval('@array[0]:p'), "0\tA",
        ":p on an array returned the correct pair", :todo<feature>;

    eval('@array[0]:p.value = "a"');
    is @array[0], "a",
        ":p on an array returns lvalues (like normal subscripts do as well)", :todo<feature>;

    is +eval('@array[0,1]:p'), 2,
        ":p on an array returned a two-elem array", :todo<feature>;
    is ~eval('@array[0,1]:p'), "0\ta 1\tB",
        ":p on an array returned a two-elem array consisting of the correct pairs", :todo<feature>;

    is +eval('@array[42,23]:p'),  0, ":p on an array weeded out non-existing entries (1)";
    is ~eval('@array[42,23]:p'), "", ":p on an array weeded out non-existing entries (2)";
}

# :kv
{
    my @array = <A B>;

    is +eval('@array[0]:kv'), 2,
        ":kv on an array returned a two-elem array", :todo<feature>;
    is ~eval('@array[0]:kv'), "0 A",
        ":kv on an array returned the correct two-elem array", :todo<feature>;

    eval('(@array[0]:kv)[1] = "a"');
    is @array[0], "a",
        ":kv on an array returns lvalues (like normal subscripts do as well)", :todo<feature>;

    is +eval('@array[0,1]:kv'), 4,
        ":kv on an array returned a four-elem array", :todo<feature>;
    is ~eval('@array[0,1]:kv'), "0 a 1 B",
        ":kv on an array returned the correct four-elem array", :todo<feature>;

    is +eval('@array[42,23]:kv'),  0, ":kv on an array weeded out non-existing entries (1)";
    is ~eval('@array[42,23]:kv'), "", ":kv on an array weeded out non-existing entries (2)";
}

# :k
{
    my @array = <A B>;

    is +eval('@array[0]:k'), 1,
        ":k on an array returned an one-elem array", :todo<feature>;
    is ~eval('@array[0]:k'), "0",
        ":k on an array returned the correct one-elem array", :todo<feature>;

    is +eval('@array[0,1]:k'), 2,
        ":k on an array returned a tow-elem array", :todo<feature>;
    is ~eval('@array[0,1]:k'), "0 1",
        ":k on an array returned the correct two-elem array", :todo<feature>;

    is +eval('@array[42,23]:k'),  0, ":k on an array weeded out non-existing entries (1)";
    is ~eval('@array[42,23]:k'), "", ":k on an array weeded out non-existing entries (2)";
}

# :v
{
    my @array = <A B>;

    is +eval('@array[0]:v'), 1,
        ":v on an array returned an one-elem array", :todo<feature>;
    is ~eval('@array[0]:v'), "A",
        ":v on an array returned the correct one-elem array", :todo<feature>;

    eval('@array[0]:v = "a"');
    is @array[0], "a",
        ":v on an array returns lvalues (like normal subscripts do as well)", :todo<feature>;

    is +eval('@array[0,1]:v'), 2,
        ":v on an array returned a tow-elem array", :todo<feature>;
    is ~eval('@array[0,1]:v'), "a B",
        ":v on an array returned the correct two-elem array", :todo<feature>;

    is +eval('@array[42,23]:v'),  0, ":v on an array weeded out non-existing entries (1)";
    is ~eval('@array[42,23]:v'), "", ":v on an array weeded out non-existing entries (2)";
}

# Adverbs on hash subscripts
# :p
{
    my %hash = (0 => "A", 1 => "B");

    isa_ok eval('%hash<0>:p'), Pair,
        ":p on a hash returned a Pair", :todo<feature>;
    is ~eval('%hash<0>:p'), "0\tA",
        ":p on a hash returned the correct pair", :todo<feature>;

    eval('%hash<0>:p.value = "a"');
    is %hash<0>, "a",
        ":p on a hash returns lvalues (like normal subscripts do as well)", :todo<feature>;

    is +eval('%hash<0 1>:p'), 2,
        ":p on a hash returned a two-elem array", :todo<feature>;
    is ~eval('%hash<0 1>:p'), "0\ta 1\tB",
        ":p on a hash returned a two-elem array consisting of the correct pairs", :todo<feature>;

    is +eval('%hash<42 23>:p'),  0, ":p on a hash weeded out non-existing entries (1)";
    is ~eval('%hash<42 23>:p'), "", ":p on a hash weeded out non-existing entries (2)";
}

# :kv
{
    my %hash = (0 => "A", 1 => "B");

    is +eval('%hash<0>:kv'), 2,
        ":kv on a hash returned a two-elem array", :todo<feature>;
    is ~eval('%hash<0>:kv'), "0 A",
        ":kv on a hash returned the correct two-elem array", :todo<feature>;

    eval('(%hash<0>:kv)[1] = "a"');
    is %hash<0>, "a",
        ":kv on a hash returns lvalues (like normal subscripts do as well)", :todo<feature>;

    is +eval('%hash<0 1>:kv'), 4,
        ":kv on a hash returned a four-elem array", :todo<feature>;
    is ~eval('%hash<0 1>:kv'), "0 a 1 B",
        ":kv on a hash returned the correct four-elem array", :todo<feature>;

    is +eval('%hash<42 23>:kv'),  0, ":kv on a hash weeded out non-existing entries (1)";
    is ~eval('%hash<42 23>:kv'), "", ":kv on a hash weeded out non-existing entries (2)";
}

# :k
{
    my %hash = (0 => "A", 1 => "B");

    is +eval('%hash<0>:k'), 1,
        ":k on a hash returned an one-elem array", :todo<feature>;
    is ~eval('%hash<0>:k'), "0",
        ":k on a hash returned the correct one-elem array", :todo<feature>;

    is +eval('%hash<0 1>:k'), 2,
        ":k on a hash returned a tow-elem array", :todo<feature>;
    is ~eval('%hash<0 1>:k'), "0 1",
        ":k on a hash returned the correct two-elem array", :todo<feature>;

    is +eval('%hash<42 23>:k'),  0, ":k on a hash weeded out non-existing entries (1)";
    is ~eval('%hash<42 23>:k'), "", ":k on a hash weeded out non-existing entries (2)";
}

# :v
{
    my %hash = (0 => "A", 1 => "B");

    is +eval('%hash<0>:v'), 1,
        ":v on a hash returned an one-elem array", :todo<feature>;
    is ~eval('%hash<0>:v'), "A",
        ":v on a hash returned the correct one-elem array", :todo<feature>;

    eval('%hash<0>:v = "a"');
    is %hash<0>, "a",
        ":v on a hash returns lvalues (like normal subscripts do as well)", :todo<feature>;

    is +eval('%hash<0 1>:v'), 2,
        ":v on a hash returned a tow-elem array", :todo<feature>;
    is ~eval('%hash<0 1>:v'), "a B",
        ":v on a hash returned the correct two-elem array", :todo<feature>;

    is +eval('%hash<42 23>:v'),  0, ":v on a hash weeded out non-existing entries (1)";
    is ~eval('%hash<42 23>:v'), "", ":v on a hash weeded out non-existing entries (2)";
}

# The adverbial forms weed out non-existing entries, but undefined (but
# existing) entries should be unaffected by this rule.
{
    my @array = (42, undef, 23);

    is +eval('@array[0,1,2]:kv'), 6,
        "undefined but existing entries should not be weeded out (1)", :todo<feature>;
    is ~eval('@array[0,1,2]:kv'), "0 42 1  2 23",
        "undefined but existing entries should not be weeded out (2)", :todo<feature>;
}

{
    my %hash = (0 => 42, 1 => undef, 2 => 23);

    is +eval('%hash<0 1 2>:kv'), 6,
        "undefined but existing entries should not be weeded out (3)", :todo<feature>;
    is ~eval('%hash<0 1 2>:kv'), "0 42 1  2 23",
        "undefined but existing entries should not be weeded out (4)", :todo<feature>;
}