WP_HTML_Processor::step_in_frameset(): bool

Source

private function step_in_frameset(): bool {
	$tag_name   = $this->get_token_name();
	$token_type = $this->get_token_type();
	$op_sigil   = '#tag' === $token_type ? ( $this->is_tag_closer() ? '-' : '+' ) : '';
	$op         = "{$op_sigil}{$tag_name}";

	switch ( $op ) {
		/*
		 * > A character token that is one of U+0009 CHARACTER TABULATION, U+000A LINE FEED (LF),
		 * >   U+000C FORM FEED (FF), U+000D CARRIAGE RETURN (CR), or U+0020 SPACE
		 * >
		 * > Insert the character.
		 *
		 * This algorithm effectively strips non-whitespace characters from text and inserts
		 * them under HTML. This is not supported at this time.
		 */
		case '#text':
			if ( parent::TEXT_IS_WHITESPACE === $this->text_node_classification ) {
				return $this->step_in_body();
			}
			$this->bail( 'Non-whitespace characters cannot be handled in frameset.' );
			break;

		/*
		 * > A comment token
		 */
		case '#comment':
		case '#funky-comment':
		case '#presumptuous-tag':
			$this->insert_html_element( $this->state->current_token );
			return true;

		/*
		 * > A DOCTYPE token
		 */
		case 'html':
			// Parse error: ignore the token.
			return $this->step();

		/*
		 * > A start tag whose tag name is "html"
		 */
		case '+HTML':
			return $this->step_in_body();

		/*
		 * > A start tag whose tag name is "frameset"
		 */
		case '+FRAMESET':
			$this->insert_html_element( $this->state->current_token );
			return true;

		/*
		 * > An end tag whose tag name is "frameset"
		 */
		case '-FRAMESET':
			/*
			 * > If the current node is the root html element, then this is a parse error;
			 * > ignore the token. (fragment case)
			 */
			if ( $this->state->stack_of_open_elements->current_node_is( 'HTML' ) ) {
				return $this->step();
			}

			/*
			 * > Otherwise, pop the current node from the stack of open elements.
			 */
			$this->state->stack_of_open_elements->pop();

			/*
			 * > If the parser was not created as part of the HTML fragment parsing algorithm
			 * > (fragment case), and the current node is no longer a frameset element, then
			 * > switch the insertion mode to "after frameset".
			 */
			if ( ! isset( $this->context_node ) && ! $this->state->stack_of_open_elements->current_node_is( 'FRAMESET' ) ) {
				$this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_AFTER_FRAMESET;
			}

			return true;

		/*
		 * > A start tag whose tag name is "frame"
		 *
		 * > Insert an HTML element for the token. Immediately pop the
		 * > current node off the stack of open elements.
		 * >
		 * > Acknowledge the token's self-closing flag, if it is set.
		 */
		case '+FRAME':
			$this->insert_html_element( $this->state->current_token );
			$this->state->stack_of_open_elements->pop();
			return true;

		/*
		 * > A start tag whose tag name is "noframes"
		 */
		case '+NOFRAMES':
			return $this->step_in_head();
	}

	// Parse error: ignore the token.
	return $this->step();
}

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