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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.
*
* @since 6.5.0
*
* @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 )
);
}
}