KeyValueAccess.php

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<?php

declare(strict_types=1);

namespace ILIAS\Refinery;

use Closure;
use ArrayAccess;
use Countable;

class KeyValueAccess implements ArrayAccess, Countable
{
    private array $raw_values;
    private Transformation $trafo;

    public function __construct(array $raw_values, Transformation $trafo)
    {
        $this->trafo = $trafo;
        $this->raw_values = $raw_values;
    }

    public function offsetExists($offset): bool
    {
        return isset($this->raw_values[$offset]);
    }

    public function offsetGet($offset)
    {
        if (!$this->offsetExists($offset)) {
            return null;
        }

        return is_array($this->raw_values[$offset])
            ? array_map($this->getApplicator(), $this->raw_values[$offset])
            : $this->getApplicator()($this->raw_values[$offset]);
    }

    private function getApplicator(): Closure
    {
        return function ($value) {
            if (is_array($value)) {
                foreach ($value as $k => $v) {
                    $value[$k] = $this->getApplicator()($v);
                }
                return $value;
            }
            return $this->trafo->transform($value);
        };
    }

    public function offsetSet($offset, $value): void
    {
        $this->raw_values[$offset] = $value;
    }

    public function offsetUnset($offset): void
    {
        if ($this->offsetExists($offset)) {
            unset($this->raw_values[$offset]);
        }
    }

    public function count(): int
    {
        return count($this->raw_values);
    }
}