$this->is_relative( $url ) === true ) {
			return $this->build_absolute_url( $url );
		}

		return $url;
	}

	/**
	 * Parse the home URL setting to find the base URL for relative URLs.
	 *
	 * @param string|null $path Optional path string.
	 *
	 * @return string
	 */
	public function build_absolute_url( $path = null ) {
		$path      = \wp_parse_url( $path, \PHP_URL_PATH );
		$url_parts = \wp_parse_url( \home_url() );

		$base_url = \trailingslashit( $url_parts['scheme'] . '://' . $url_parts['host'] );

		if ( ! \is_null( $path ) ) {
			$base_url .= \ltrim( $path, '/' );
		}

		return $base_url;
	}

	/**
	 * Returns the link type.
	 *
	 * @param array      $url      The URL, as parsed by wp_parse_url.
	 * @param array|null $home_url Optional. The home URL, as parsed by wp_parse_url. Used to avoid reparsing the home_url.
	 * @param bool       $is_image Whether or not the link is an image.
	 *
	 * @return string The link type.
	 */
	public function get_link_type( $url, $home_url = null, $is_image = false ) {
		// If there is no scheme and no host the link is always internal.
		// Beware, checking just the scheme isn't enough as a link can be //yoast.com for instance.
		if ( empty( $url['scheme'] ) && empty( $url['host'] ) ) {
			return ( $is_image ) ? SEO_Links::TYPE_INTERNAL_IMAGE : SEO_Links::TYPE_INTERNAL;
		}

		// If there is a scheme but it's not http(s) then the link is always external.
		if ( \array_key_exists( 'scheme', $url ) && ! \in_array( $url['scheme'], [ 'http', 'https' ], true ) ) {
			return ( $is_image ) ? SEO_Links::TYPE_EXTERNAL_IMAGE : SEO_Links::TYPE_EXTERNAL;
		}

		if ( \is_null( $home_url ) ) {
			$home_url = \wp_parse_url( \home_url() );
		}

		// When the base host is equal to the host.
		if ( isset( $url['host'] ) && $url['host'] !== $home_url['host'] ) {
			return ( $is_image ) ? SEO_Links::TYPE_EXTERNAL_IMAGE : SEO_Links::TYPE_EXTERNAL;
		}

		// There is no base path and thus all URLs of the same domain are internal.
		if ( empty( $home_url['path'] ) ) {
			return ( $is_image ) ? SEO_Links::TYPE_INTERNAL_IMAGE : SEO_Links::TYPE_INTERNAL;
		}

		// When there is a path and it matches the start of the url.
		if ( isset( $url['path'] ) && \strpos( $url['path'], $home_url['path'] ) === 0 ) {
			return ( $is_image ) ? SEO_Links::TYPE_INTERNAL_IMAGE : SEO_Links::TYPE_INTERNAL;
		}

		return ( $is_image ) ? SEO_Links::TYPE_EXTERNAL_IMAGE : SEO_Links::TYPE_EXTERNAL;
	}

	/**
	 * Recreate current URL.
	 *
	 * @param bool $with_request_uri Whether we want the REQUEST_URI appended.
	 *
	 * @return string
	 */
	public function recreate_current_url( $with_request_uri = true ) {
		$current_url = 'http';
		if ( isset( $_SERVER['HTTPS'] ) && $_SERVER['HTTPS'] === 'on' ) {
			$current_url .= 's';
		}
		$current_url .= '://';

		// phpcs:ignore WordPress.Security.ValidatedSanitizedInput -- We know this is scary.
		$suffix = ( $with_request_uri && isset( $_SERVER['REQUEST_URI'] ) ) ? $_SERVER['REQUEST_URI'] : '';

		if ( isset( $_SERVER['SERVER_NAME'] ) && ! empty( $_SERVER['SERVER_NAME'] ) ) {
			// phpcs:ignore WordPress.Security.ValidatedSanitizedInput -- We know this is scary.
			$server_name = $_SERVER['SERVER_NAME'];
		}
		else {
			// Early return with just the path.
			return $suffix;
		}

		$server_port = '';
		if ( isset( $_SERVER['SERVER_PORT'] ) && $_SERVER['SERVER_PORT'] !== '80' && $_SERVER['SERVER_PORT'] !== '443' ) {
			// phpcs:ignore WordPress.Security.ValidatedSanitizedInput -- We know this is scary.
			$server_port = $_SERVER['SERVER_PORT'];
		}

		if ( ! empty( $server_port ) ) {
			$current_url .= $server_name . ':' . $server_port . $suffix;
		}
		else {
			// phpcs:ignore WordPress.Security.ValidatedSanitizedInput -- We know this is scary.
			$current_url .= $server_name . $suffix;
		}

		return $current_url;
	}

	/**
	 * Parses a URL and returns its components, this wrapper function was created to support unit tests.
	 *
	 * @param string $parsed_url The URL to parse.
	 * @return array The parsed components of the URL.
	 */
	public function parse_str_params( $parsed_url ) {
		$array = [];

		// @todo parse_str changes spaces in param names into `_`, we should find a better way to support them.
		\wp_parse_str( $parsed_url, $array );

		return $array;
	}
}
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