class MarkupInterfaceComparator

class MarkupInterfaceComparator extends Comparator {
    
    /**
     * {@inheritdoc}
     */
    public function accepts($expected, $actual) : bool {
        // If at least one argument is a MarkupInterface object, we take over and
        // convert to strings before comparing.
        return $expected instanceof MarkupInterface && $actual instanceof MarkupInterface || $expected instanceof MarkupInterface && is_scalar($actual) || is_scalar($expected) && $actual instanceof MarkupInterface;
    }
    
    /**
     * {@inheritdoc}
     */
    public function assertEquals($expected, $actual, $delta = 0.0, $canonicalize = FALSE, $ignoreCase = FALSE) : void {
        if (is_scalar($expected) && is_scalar($actual)) {
            throw new \LogicException(__METHOD__ . '() should not be called directly. Use TestCase::assertEquals() instead');
        }
        if (is_array($expected) || is_array($actual)) {
            throw new \InvalidArgumentException('Expected and actual arguments passed to ' . __METHOD__ . '() must not be arrays');
        }
        $expected_safe = (string) $expected;
        $actual_safe = (string) $actual;
        $expected_safe_stripped = strip_tags($expected_safe);
        $actual_safe_stripped = strip_tags($actual_safe);
        if (!($expected instanceof MarkupInterface && $actual instanceof MarkupInterface)) {
            if ($expected_safe !== $expected_safe_stripped && $actual_safe !== $actual_safe_stripped) {
                throw new \RuntimeException("Cannot compare markup between MarkupInterface objects and plain strings");
            }
        }
        $comparator = $this->factory()
            ->getComparatorFor($expected_safe_stripped, $actual_safe_stripped);
        $comparator->assertEquals($expected_safe_stripped, $actual_safe_stripped, $delta, $canonicalize, $ignoreCase);
    }

}