Nette\DI\Config\Adapters\NeonAdapter::process PHP Method

    private function process(array $arr)
    {
        $res = [];
        foreach ($arr as $key => $val) {
            if (is_string($key) && substr($key, -1) === self::PREVENT_MERGING) {
                if (!is_array($val) && $val !== NULL) {
                    throw new Nette\InvalidStateException("Replacing operator is available only for arrays, item '{$key}' is not array.");
                }
                $key = substr($key, 0, -1);
                $val[Helpers::EXTENDS_KEY] = Helpers::OVERWRITE;
            } elseif (is_string($key) && preg_match('#^(\\S+)\\s+' . self::INHERITING_SEPARATOR . '\\s+(\\S+)\\z#', $key, $matches)) {
                if (!is_array($val) && $val !== NULL) {
                    throw new Nette\InvalidStateException("Inheritance operator is available only for arrays, item '{$key}' is not array.");
                }
                list(, $key, $val[Helpers::EXTENDS_KEY]) = $matches;
                if (isset($res[$key])) {
                    throw new Nette\InvalidStateException("Duplicated key '{$key}'.");
                }
            }
            if (is_array($val)) {
                $val = $this->process($val);
            } elseif ($val instanceof Neon\Entity) {
                if ($val->value === Neon\Neon::CHAIN) {
                    $tmp = NULL;
                    foreach ($this->process($val->attributes) as $st) {
                        $tmp = new Statement($tmp === NULL ? $st->getEntity() : [$tmp, ltrim($st->getEntity(), ':')], $st->arguments);
                    }
                    $val = $tmp;
                } else {
                    $tmp = $this->process([$val->value]);
                    $val = new Statement($tmp[0], $this->process($val->attributes));
                }
            }
            $res[$key] = $val;
        }
        return $res;
    }