WP_HTML_Tag_Processor::after_tag()

Source

 */
private function parse_next_attribute(): bool {
	$doc_length = strlen( $this->html );

	// Skip whitespace and slashes.
	$this->bytes_already_parsed += strspn( $this->html, " \t\f\r\n/", $this->bytes_already_parsed );
	if ( $this->bytes_already_parsed >= $doc_length ) {
		$this->parser_state = self::STATE_INCOMPLETE_INPUT;

		return false;
	}

	/*
	 * Treat the equal sign as a part of the attribute
	 * name if it is the first encountered byte.
	 *
	 * @see https://html.spec.whatwg.org/multipage/parsing.html#before-attribute-name-state
	 */
	$name_length = '=' === $this->html[ $this->bytes_already_parsed ]
		? 1 + strcspn( $this->html, "=/> \t\f\r\n", $this->bytes_already_parsed + 1 )
		: strcspn( $this->html, "=/> \t\f\r\n", $this->bytes_already_parsed );

	// No attribute, just tag closer.
	if ( 0 === $name_length || $this->bytes_already_parsed + $name_length >= $doc_length ) {
		return false;
	}

	$attribute_start             = $this->bytes_already_parsed;
	$attribute_name              = substr( $this->html, $attribute_start, $name_length );
	$this->bytes_already_parsed += $name_length;
	if ( $this->bytes_already_parsed >= $doc_length ) {
		$this->parser_state = self::STATE_INCOMPLETE_INPUT;

		return false;
	}

	$this->skip_whitespace();
	if ( $this->bytes_already_parsed >= $doc_length ) {
		$this->parser_state = self::STATE_INCOMPLETE_INPUT;

		return false;
	}

	$has_value = '=' === $this->html[ $this->bytes_already_parsed ];
	if ( $has_value ) {
		++$this->bytes_already_parsed;
		$this->skip_whitespace();
		if ( $this->bytes_already_parsed >= $doc_length ) {
			$this->parser_state = self::STATE_INCOMPLETE_INPUT;

			return false;

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