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<?php /** * Interactivity API: WP_Interactivity_API_Directives_Processor class. * * @package WordPress * @subpackage Interactivity API * @since 6.5.0 */ /** * Class used to iterate over the tags of an HTML string and help process the * directive attributes. * * @since 6.5.0 * * @access private */ final class WP_Interactivity_API_Directives_Processor extends WP_HTML_Tag_Processor { /** * List of tags whose closer tag is not visited by the WP_HTML_Tag_Processor. * * @since 6.5.0 * @var string[] */ const TAGS_THAT_DONT_VISIT_CLOSER_TAG = array( 'SCRIPT', 'IFRAME', 'NOEMBED', 'NOFRAMES', 'STYLE', 'TEXTAREA', 'TITLE', 'XMP', ); /** * Returns the content between two balanced template tags. * * It positions the cursor in the closer tag of the balanced template tag, * if it exists. * * @since 6.5.0 * * @access private * * @return string|null The content between the current opener template tag and its matching closer tag or null if it * doesn't find the matching closing tag or the current tag is not a template opener tag. */ public function get_content_between_balanced_template_tags() { if ( 'TEMPLATE' !== $this->get_tag() ) { return null; } $positions = $this->get_after_opener_tag_and_before_closer_tag_positions(); if ( ! $positions ) { return null; } list( $after_opener_tag, $before_closer_tag ) = $positions; return substr( $this->html, $after_opener_tag, $before_closer_tag - $after_opener_tag ); } /** * Sets the content between two balanced tags. * * @since 6.5.0 * * @access private * * @param string $new_content The string to replace the content between the matching tags. * @return bool Whether the content was successfully replaced. */ public function set_content_between_balanced_tags( string $new_content ): bool { $positions = $this->get_after_opener_tag_and_before_closer_tag_positions( true ); if ( ! $positions ) { return false; } list( $after_opener_tag, $before_closer_tag ) = $positions; $this->lexical_updates[] = new WP_HTML_Text_Replacement( $after_opener_tag, $before_closer_tag - $after_opener_tag, esc_html( $new_content ) ); return true; } /** * Appends content after the closing tag of a template tag. * * It positions the cursor in the closer tag of the balanced template tag, * if it exists. * * @access private * * @param string $new_content The string to append after the closing template tag. * @return bool Whether the content was successfully appended. */ public function append_content_after_template_tag_closer( string $new_content ): bool { if ( empty( $new_content ) || 'TEMPLATE' !== $this->get_tag() || ! $this->is_tag_closer() ) { return false; } // Flushes any changes. $this->get_updated_html(); $bookmark = 'append_content_after_template_tag_closer'; $this->set_bookmark( $bookmark ); $after_closing_tag = $this->bookmarks[ $bookmark ]->start + $this->bookmarks[ $bookmark ]->length; $this->release_bookmark( $bookmark ); // Appends the new content. $this->lexical_updates[] = new WP_HTML_Text_Replacement( $after_closing_tag, 0, $new_content ); return true; } /** * Gets the positions right after the opener tag and right before the closer * tag in a balanced tag. * * By default, it positions the cursor in the closer tag of the balanced tag. * If $rewind is true, it seeks back to the opener tag. * * @since 6.5.0 * * @access private * * @param bool $rewind Optional. Whether to seek back to the opener tag after finding the positions. Defaults to false. * @return array|null Start and end byte position, or null when no balanced tag bookmarks. */ private function get_after_opener_tag_and_before_closer_tag_positions( bool $rewind = false ) { // Flushes any changes. $this->get_updated_html(); $bookmarks = $this->get_balanced_tag_bookmarks(); if ( ! $bookmarks ) { return null; } list( $opener_tag, $closer_tag ) = $bookmarks; $after_opener_tag = $this->bookmarks[ $opener_tag ]->start + $this->bookmarks[ $opener_tag ]->length; $before_closer_tag = $this->bookmarks[ $closer_tag ]->start; if ( $rewind ) { $this->seek( $opener_tag ); } $this->release_bookmark( $opener_tag ); $this->release_bookmark( $closer_tag ); return array( $after_opener_tag, $before_closer_tag ); } /** * Returns a pair of bookmarks for the current opener tag and the matching * closer tag. * * It positions the cursor in the closer tag of the balanced tag, if it * exists. * * @since 6.5.0 * * @return array|null A pair of bookmarks, or null if there's no matching closing tag. */ private function get_balanced_tag_bookmarks() { static $i = 0; $opener_tag = 'opener_tag_of_balanced_tag_' . ++$i; $this->set_bookmark( $opener_tag ); if ( ! $this->next_balanced_tag_closer_tag() ) { $this->release_bookmark( $opener_tag ); return null; } $closer_tag = 'closer_tag_of_balanced_tag_' . ++$i; $this->set_bookmark( $closer_tag ); return array( $opener_tag, $closer_tag ); } /** * Skips processing the content between tags. * * It positions the cursor in the closer tag of the foreign element, if it * exists. * * This function is intended to skip processing SVG and MathML inner content * instead of bailing out the whole processing. * * @since 6.5.0 * * @access private * * @return bool Whether the foreign content was successfully skipped. */ public function skip_to_tag_closer(): bool { $depth = 1; $tag_name = $this->get_tag(); while ( $depth > 0 && $this->next_tag( array( 'tag_closers' => 'visit' ) ) ) { if ( ! $this->is_tag_closer() && $this->get_attribute_names_with_prefix( 'data-wp-' ) ) { /* translators: 1: SVG or MATH HTML tag. */ $message = sprintf( __( 'Interactivity directives were detected inside an incompatible %1$s tag. These directives will be ignored in the server side render.' ), $tag_name ); _doing_it_wrong( __METHOD__, $message, '6.6.0' ); } if ( $this->get_tag() === $tag_name ) { if ( $this->has_self_closing_flag() ) { continue; } $depth += $this->is_tag_closer() ? -1 : 1; } } return 0 === $depth; } /** * Finds the matching closing tag for an opening tag. * * When called while the processor is on an open tag, it traverses the HTML * until it finds the matching closer tag, respecting any in-between content, * including nested tags of the same name. Returns false when called on a * closer tag, a tag that doesn't have a closer tag (void), a tag that * doesn't visit the closer tag, or if no matching closing tag was found. * * @since 6.5.0 * * @access private * * @return bool Whether a matching closing tag was found. */ public function next_balanced_tag_closer_tag(): bool { $depth = 0; $tag_name = $this->get_tag(); if ( ! $this->has_and_visits_its_closer_tag() ) { return false; } while ( $this->next_tag( array( 'tag_name' => $tag_name, 'tag_closers' => 'visit', ) ) ) { if ( ! $this->is_tag_closer() ) { ++$depth; continue; } if ( 0 === $depth ) { return true; } --$depth; } return false; } /** * Checks whether the current tag has and will visit its matching closer tag. * * @since 6.5.0 * * @access private * * @return bool Whether the current tag has a closer tag. */ public function has_and_visits_its_closer_tag(): bool { $tag_name = $this->get_tag(); return null !== $tag_name && ( ! WP_HTML_Processor::is_void( $tag_name ) && ! in_array( $tag_name, self::TAGS_THAT_DONT_VISIT_CLOSER_TAG, true ) ); } }
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