HTML API: Prevent bookmark exhaustion from throwing.

When bookmark exhaustion occurs during processing, return `false` instead of throwing an `Exception`.

Developed in WordPress/wordpress-develop#10616.

Props jonsurrell, westonruter, dmsnell.
Fixes #64394.

Built from https://develop.svn.wordpress.org/trunk@61755


git-svn-id: http://core.svn.wordpress.org/trunk@61061 1a063a9b-81f0-0310-95a4-ce76da25c4cd

Author: sirreal

wp-includes/html-api/class-wp-html-processor.php

@@ -1042,8 +1042,17 @@ public function step( $node_to_process = self::PROCESS_NEXT_NODE ): bool {
 		$token_name            = $this->get_token_name();
 
 		if ( self::REPROCESS_CURRENT_NODE !== $node_to_process ) {
+			try {
+				$bookmark_name = $this->bookmark_token();
+			} catch ( Exception $e ) {
+				if ( self::ERROR_EXCEEDED_MAX_BOOKMARKS === $this->last_error ) {
+					return false;
+				}
+				throw $e;
+			}
+
 			$this->state->current_token = new WP_HTML_Token(
-				$this->bookmark_token(),
+				$bookmark_name,
 				$token_name,
 				$this->has_self_closing_flag(),
 				$this->release_internal_bookmark_on_destruct
@@ -1153,6 +1162,12 @@ public function step( $node_to_process = self::PROCESS_NEXT_NODE ): bool {
 			 * otherwise might involve messier calling and return conventions.
 			 */
 			return false;
+		} catch ( Exception $e ) {
+			if ( self::ERROR_EXCEEDED_MAX_BOOKMARKS === $this->last_error ) {
+				return false;
+			}
+			// Rethrow any other exceptions for higher-level handling.
+			throw $e;
 		}
 	}
 
@@ -6315,6 +6330,8 @@ private function insert_foreign_element( WP_HTML_Token $token, bool $only_add_to
 	 *
 	 * @since 6.7.0
 	 *
+	 * @throws Exception When unable to allocate a bookmark for the next token in the input HTML document.
+	 *
 	 * @param string      $token_name    Name of token to create and insert into the stack of open elements.
 	 * @param string|null $bookmark_name Optional. Name to give bookmark for created virtual node.
 	 *                                   Defaults to auto-creating a bookmark name.

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '7.0-beta2-61754';
+$wp_version = '7.0-beta2-61755';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.