array.t

use v6;

use Test;

plan 91;

#L<S02/Mutable types/Array>

{
    my $i = 0;
    $i++ for 1, 2, 3;
    is $i, 3, 'for 1, 2, 3 does three iterations';
}


{
    # see RT #63350 for discussion
    # also: 78284
    my $i = 0;
    $i++ for (1, 2, 3).item;
    #?pugs todo
    is $i, 1, 'for (1, 2, 3).item does one iteration';

    $i = 0;
    $i++ for $(1, 2, 3);
    #?pugs todo
    is $i, 1, 'for $(1, 2, 3) does one iteration';
}

{
    my $i = 0;
    $i++ for [1, 2, 3];
    is $i, 1, 'for [1, 2, 3] does one iteration';
}

# uninitialized array variables should work too...
#?pugs todo
{
    my @a;
    is eval(@a.perl).elems, 0, '@a.perl on uninitialized variable';
}

# array of strings

my @array1 = ("foo", "bar", "baz");
isa_ok(@array1, Array);

is(+@array1, 3, 'the array1 has 3 elements');
is(@array1[0], 'foo', 'got the right value at array1 index 0');
is(@array1[1], 'bar', 'got the right value at array1 index 1');
is(@array1[2], 'baz', 'got the right value at array1 index 2');


is(@array1.[0], 'foo', 'got the right value at array1 index 0 using the . notation');


# array with strings, numbers and undef
my @array2 = ("test", 1, Mu);

{
    isa_ok(@array2, Array);

    is(+@array2, 3, 'the array2 has 3 elements');
    is(@array2[0], 'test', 'got the right value at array2 index 0');
    is(@array2[1], 1,      'got the right value at array2 index 1');
    ok(!@array2[2].defined,  'got the right value at array2 index 2');
}

# combine 2 arrays
{
    my @array3 = (@array1, @array2);
    isa_ok(@array3, Array);

    is(+@array3, 6, 'the array3 has 6 elements');
    is(@array3[0], 'foo', 'got the right value at array3 index 0');
    is(@array3[1], 'bar', 'got the right value at array3 index 1');
    is(@array3[2], 'baz', 'got the right value at array3 index 2');
    is(@array3[3], 'test', 'got the right value at array3 index 3');
    is(@array3[4], 1,      'got the right value at array3 index 4');
    ok(!@array3[5].defined,'got the right value at array3 index 5');
}

{
    # array slice
    my @array4 = @array2[2, 1, 0];
    isa_ok(@array4, Array);

    is(+@array4, 3, 'the array4 has 3 elements');
    ok(!defined(@array4[0]), 'got the right value at array4 index 0');
    is(@array4[1], 1,      'got the right value at array4 index 1');
    is(@array4[2], 'test', 'got the right value at array4 index 2');
}

{
    # create new array with 2 array slices
    my @array5 = ( @array2[2, 1, 0], @array1[2, 1, 0] );
    isa_ok(@array5, Array);

    is(+@array5, 6, 'the array5 has 6 elements');
    ok(!defined(@array5[0]),  'got the right value at array5 index 0');
    is(@array5[1], 1,      'got the right value at array5 index 1');
    is(@array5[2], 'test', 'got the right value at array5 index 2');
    is(@array5[3], 'baz',  'got the right value at array5 index 3');
    is(@array5[4], 'bar',  'got the right value at array5 index 4');
    is(@array5[5], 'foo',  'got the right value at array5 index 5');
}

{
    # create an array slice with an array (in a variable)

    my @slice = (2, 0, 1);
    my @array6 = @array1[@slice];
    isa_ok(@array6, Array);

    is(+@array6, 3, 'the array6 has 3 elements');
    is(@array6[0], 'baz', 'got the right value at array6 index 0');
    is(@array6[1], 'foo', 'got the right value at array6 index 1');
    is(@array6[2], 'bar', 'got the right value at array6 index 2');
}

{
    # create an array slice with an array constructed with ()
    my @array7 = @array1[(2, 1, 0)];
    isa_ok(@array7, Array);

    is(+@array7, 3, 'the array7 has 3 elements');
    is(@array7[0], 'baz', 'got the right value at array7 index 0');
    is(@array7[1], 'bar', 'got the right value at array7 index 1');
    is(@array7[2], 'foo', 'got the right value at array7 index 2');
}

{
    # odd slices
    my $result1 = (1, 2, 3, 4)[1];
    is($result1, 2, 'got the right value from the slice');

    my $result2 = [1, 2, 3, 4][2];
    is($result2, 3, 'got the right value from the slice');
}

# swap two elements test moved to t/op/assign.t

# empty arrays
{
    my @array9;
    isa_ok(@array9, Array);
    is(+@array9, 0, "new arrays are empty");

    my @array10 = (1, 2, 3,);
    is(+@array10, 3, "trailing commas make correct array");
}

#?pugs todo "multi-dim arrays not implemented"
#?rakudo skip "multi-dim arrays"
#?niecza skip "multi-dim arrays"
{
# declare a multidimension array
    eval_lives_ok('my @multidim[0..3; 0..1]', "multidimension array");
    my @array11 is shape(2,4);

    # XXX what should that test actually do?
    ok(eval('@array11[2;0] = 12'), "push the value to a multidimension array");
}

{
    # declare the array with data type
    my Int @array;
    lives_ok { @array[0] = 23 },                   "stuffing Ints in an Int array works";
    #?niecza todo "type constraints"
    #?pugs todo
    dies_ok  { @array[1] = $*ERR }, "stuffing IO in an Int array does not work";
}

#?pugs skip "no whatever star yet"
{
    my @array12 = ('a', 'b', 'c', 'e');

    # indexing from the end
    is @array12[*-1],'e', "indexing from the end [*-1]";

    # end index range
    #?niecza skip "WhateverCode/.. interaction"
    is ~@array12[*-4 .. *-2], 'a b c', "end indices [*-4 .. *-2]";

    # end index as lvalue
    @array12[*-1]   = 'd';
    is @array12[*-1], 'd', "assigns to the correct end slice index";
    is ~@array12,'a b c d', "assignment to end index correctly alters the array";
}

#?pugs skip "no whatever star yet"
#?niecza skip "*/.. interaction"
{
    my @array13 = ('a', 'b', 'c', 'd');
    # end index range as lvalue
    @array13[*-4 .. *-1]   = ('d', 'c', 'b', 'a'); # ('a'..'d').reverse
    is ~@array13, 'd c b a', "end range as lvalue";

    #hat trick
    my @array14 = ('a', 'b', 'c', 'd');
    my @b = 0..3;
    ((@b[*-3,*-2,*-1,*-4] = @array14)= @array14[*-1,*-2,*-3,*-4]);

    is ~@b,
        'a d c b',
        "hat trick:
        assign to a end-indexed slice array from array
        lvalue in assignment is then lvalue to end-indexed slice as rvalue";
}

# RT #76676
#?niecza todo
#?pugs todo
{
    is ~<a b>.[^10], 'a b', 'Range subscript as rvalues clip to existing elems';
}

# This test may seem overly simplistic, but it was actually a bug in PIL2JS, so
# why not write a test for it so other backends can benefit of it, too? :)
{
  my @arr = (0, 1, 2, 3);
  @arr[0] = "new value";
  is @arr[0], "new value", "modifying of array contents (constants) works";
}

{
  my @arr;
  lives_ok { @arr[*-1] },  "readonly accessing [*-1] of an empty array is ok (1)";
  ok !(try { @arr[*-1] }), "readonly accessing [*-1] of an empty array is ok (2)";
  #?pugs 2 todo
  dies_ok { @arr[*-1] = 42 },      "assigning to [*-1] of an empty array is fatal";
  dies_ok { @arr[*-1] := 42 },     "binding [*-1] of an empty array is fatal";
}

{
  my @arr = (23);
  lives_ok { @arr[*-2] },  "readonly accessing [*-2] of an one-elem array is ok (1)";
  #?pugs 3 todo
  ok !(try { @arr[*-2] }), "readonly accessing [*-2] of an one-elem array is ok (2)";
  dies_ok { @arr[*-2] = 42 },      "assigning to [*-2] of an one-elem array is fatal";
  dies_ok { @arr[*-2] := 42 },     "binding [*-2] of an empty array is fatal";
}

{
  my @arr = <a normal array with nothing funny>;
  my $minus_one = -1;

  eval_dies_ok '@arr[-1]', "readonly accessing [-1] of normal array is compile-time error";
  #?rakudo todo '@arr[-1] returns failure, not dies'
  #?niecza todo '@arr[-1] returns undef'
  #?pugs todo
  dies_ok { @arr[ $minus_one ] }, "indirectly accessing [-1] " ~
                                   "through a variable is run-time error";
  #?pugs todo
  dies_ok { @arr[$minus_one] = 42 }, "assigning to [-1] of a normal array is fatal";
  #?rakudo skip "binding not yet fatal"
  #?pugs todo
  dies_ok { @arr[$minus_one] := 42 }, "binding [-1] of a normal array is fatal";
}

# RT #73308
{
    is [][].elems, 0, '[][] returns empty list/array';
}

# RT #58372 and RT #57790
# by current group understanding of #perl6, postcircumifx:<[ ]> is actually
# defined in Any, so that .[0] is the identity operation for non-Positional
# types
#?niecza skip "Failure"
{
    is 1[0], 1, '.[0] is identity operation for scalars (Int)';
    is 'abc'[0], 'abc', '.[0] is identity operation for scalars (Str)';
    nok 'abc'[1].defined, '.[1] on a scalar is not defined';
    #?pugs skip "Failure"
    isa_ok 1[1],  Failure, 'indexing a scalar with other than 0 returns a Failure';
    #?pugs todo
    dies_ok { Mu.[0] }, 'but Mu has no .[]';
}

#RT #77072
#?niecza skip "Zen slices"
#?pugs todo
{
    my @a = <1 2 3>;
    is @a[*], <1 2 3> , 'using * to access all array elements works';
}

#RT #73402
{
    my @a = <1 2 3>;
    isa_ok +@a, Int, "Numifying an Array yields an Int";
}

#RT #75342
{
    my @a = 0, 1, 2;
    for @a {
        $_++ if $_;
    }
    is ~@a, '0 2 3', "modifier form of 'if' within 'for' loop works";
    
    my @b = 0, 1, 2;
    for @b {
        if $_ {
            $_++;
        }
    }
    is ~@b, '0 2 3', "non-modifier form of 'if' within 'for' loop also works"
}

# RT #95850
# Array.hash used to eat up the array in some early version of rakudo/nom
#?pugs skip '.hash'
{
    my @a = a => 1, b => 2;
    my %h = @a.hash;
    is %h.elems, 2, 'Array.hash created a sensible hash';
    is @a.elems, 2, '... and did not consume itself in the process';
}

# RT #79270
#?niecza skip 'Cannot use value like WhateverCode as a number'
#?pugs skip 'parsefail'
{
    my @a = <a b c>;
    @a[0 ..^ *-1] >>~=>> "x";
    is @a.join(','), 'ax,bx,c', '0..^ *-1 works as an array index';
}

#?niecza skip 'coercion syntax'
#?pugs skip "Array"
{
    is Array(1,2,3).WHAT.gist, 'Array()', 'Array(...) makes an Array';
    ok Array(1,2,3) eqv [1,2,3],          'Array(1,2,3) makes correct array';
}

done;

# vim: ft=perl6