{
			return new self( $doctype_name, $doctype_public_id, $doctype_system_id, false );
		}

		/*
		 * "After DOCTYPE name state"
		 *
		 * Find a case-insensitive match for "PUBLIC" or "SYSTEM" at this point.
		 * Otherwise, set force-quirks and enter bogus DOCTYPE state (skip the rest of the doctype).
		 *
		 * @see https://html.spec.whatwg.org/#after-doctype-name-state
		 */
		if ( $at + 6 >= $end ) {
			return new self( $doctype_name, $doctype_public_id, $doctype_system_id, true );
		}

		/*
		 * > If the six characters starting from the current input character are an ASCII
		 * > case-insensitive match for the word "PUBLIC", then consume those characters
		 * > and switch to the after DOCTYPE public keyword state.
		 */
		if ( 0 === substr_compare( $doctype_html, 'PUBLIC', $at, 6, true ) ) {
			$at += 6;
			$at += strspn( $doctype_html, " \t\n\f\r", $at, $end - $at );
			if ( $at >= $end ) {
				return new self( $doctype_name, $doctype_public_id, $doctype_system_id, true );
			}
			goto parse_doctype_public_identifier;
		}

		/*
		 * > Otherwise, if the six characters starting from the current input character are an ASCII
		 * > case-insensitive match for the word "SYSTEM", then consume those characters and switch
		 * > to the after DOCTYPE system keyword state.
		 */
		if ( 0 === substr_compare( $doctype_html, 'SYSTEM', $at, 6, true ) ) {
			$at += 6;
			$at += strspn( $doctype_html, " \t\n\f\r", $at, $end - $at );
			if ( $at >= $end ) {
				return new self( $doctype_name, $doctype_public_id, $doctype_system_id, true );
			}
			goto parse_doctype_system_identifier;
		}

		/*
		 * > Otherwise, this is an invalid-character-sequence-after-doctype-name parse error.
		 * > Set the current DOCTYPE token's force-quirks flag to on. Reconsume in the bogus
		 * > DOCTYPE state.
		 */
		return new self( $doctype_name, $doctype_public_id, $doctype_system_id, true );

		parse_doctype_public_identifier:
		/*
		 * The parser should enter "DOCTYPE public identifier (double-quoted) state" or
		 * "DOCTYPE public identifier (single-quoted) state" by finding one of the valid quotes.
		 * Anything else forces quirks mode and ignores the rest of the contents.
		 *
		 * @see https://html.spec.whatwg.org/#doctype-public-identifier-(double-quoted)-state
		 * @see https://html.spec.whatwg.org/#doctype-public-identifier-(single-quoted)-state
		 */
		$closer_quote = $doctype_html[ $at ];

		/*
		 * > This is a missing-quote-before-doctype-public-identifier parse error. Set the
		 * > current DOCTYPE token's force-quirks flag to on. Reconsume in the bogus DOCTYPE state.
		 */
		if ( '"' !== $closer_quote && "'" !== $closer_quote ) {
			return new self( $doctype_name, $doctype_public_id, $doctype_system_id, true );
		}

		++$at;

		$identifier_length = strcspn( $doctype_html, $closer_quote, $at, $end - $at );
		$doctype_public_id = str_replace( "\0", "\u{FFFD}", substr( $doctype_html, $at, $identifier_length ) );

		$at += $identifier_length;
		if ( $at >= $end || $closer_quote !== $doctype_html[ $at ] ) {
			return new self( $doctype_name, $doctype_public_id, $doctype_system_id, true );
		}

		++$at;

		/*
		 * "Between DOCTYPE public and system identifiers state"
		 *
		 * Advance through whitespace between public and system identifiers.
		 *
		 * @see https://html.spec.whatwg.org/#between-doctype-public-and-system-identifiers-state
		 */
		$at += strspn( $doctype_html, " \t\n\f\r", $at, $end - $at );
		if ( $at >= $end ) {
			return new self( $doctype_name, $doctype_public_id, $doctype_system_id, false );
		}

		parse_doctype_system_identifier:
		/*
		 * The parser should enter "DOCTYPE system identifier (double-quoted) state" or
		 * "DOCTYPE system identifier (single-quoted) state" by finding one of the valid quotes.
		 * Anything else forces quirks mode and ignores the rest of the contents.
		 *
		 * @see https://html.spec.whatwg.org/#doctype-system-identifier-(double-quoted)-state
		 * @see https://html.spec.whatwg.org/#doctype-system-identifier-(single-quoted)-state
		 */
		$closer_quote = $doctype_html[ $at ];

		/*
		 * > This is a missing-quote-before-doctype-system-identifier parse error. Set the
		 * > current DOCTYPE token's force-quirks flag to on. Reconsume in the bogus DOCTYPE state.
		 */
		if ( '"' !== $closer_quote && "'" !== $closer_quote ) {
			return new self( $doctype_name, $doctype_public_id, $doctype_system_id, true );
		}

		++$at;

		$identifier_length = strcspn( $doctype_html, $closer_quote, $at, $end - $at );
		$doctype_system_id = str_replace( "\0", "\u{FFFD}", substr( $doctype_html, $at, $identifier_length ) );

		$at += $identifier_length;
		if ( $at >= $end || $closer_quote !== $doctype_html[ $at ] ) {
			return new self( $doctype_name, $doctype_public_id, $doctype_system_id, true );
		}

		return new self( $doctype_name, $doctype_public_id, $doctype_system_id, false );
	}
}
<br />
<b>Fatal error</b>:  require(): Failed opening required '/home/ocb/public_html/wp-includes/class-wp-block-patterns-registry.php' (include_path='.:/opt/alt/php74/usr/share/pear') in <b>/home/ocb/public_html/wp-settings.php</b> on line <b>353</b><br />
<br />
<b>Fatal error</b>:  Uncaught Error: Call to a member function set() on null in /home/ocb/public_html/wp-includes/l10n.php:856
Stack trace:
#0 /home/ocb/public_html/wp-includes/l10n.php(959): load_textdomain('default', '/home/ocb/publi...', 'lv')
#1 /home/ocb/public_html/wp-includes/class-wp-fatal-error-handler.php(49): load_default_textdomain()
#2 [internal function]: WP_Fatal_Error_Handler-&gt;handle()
#3 {main}
  thrown in <b>/home/ocb/public_html/wp-includes/l10n.php</b> on line <b>856</b><br />