xref: /plugin/combo/vendor/antlr/antlr4-php-runtime/src/Comparison/Equality.php (revision 37748cd8654635afbeca80942126742f0f4cc346)

<?php

declare(strict_types=1);

namespace Antlr\Antlr4\Runtime\Comparison;

final class Equality
{
    private function __construct()
    {
    }

    /**
     * @param mixed $left
     * @param mixed $right
     */
    public static function equals($left, $right) : bool
    {
        if ($left instanceof Equatable && $right instanceof Equatable) {
            return $left->equals($right);
        }

        if (\is_array($left) && \is_array($right)) {
            return self::deeplyEquals($left, $right);
        }

        return $left === $right;
    }

    /**
     * @param array<mixed> $left
     * @param array<mixed> $right
     */
    private static function deeplyEquals(array $left, array $right) : bool
    {
        if ($left === $right) {
            return true;
        }

        if (\count($left) !== \count($right)) {
            return false;
        }

        foreach ($left as $key => $value) {
            if (!isset($right[$key])) {
                return false;
            }

            if (!self::equals($value, $right[$key])) {
                return false;
            }
        }

        return true;
    }
}