Block Parser: Explore a streaming lazy interface

For a 3 MB document which took 5 seconds and 14 GB to parse, this version of the parser parsed it in 27 ms and 20 MB.
WordPress · Jan 30, 2024 · a4f068d · a4f068d
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commit a4f068d
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Showing 4 changed files with 213 additions and 319 deletions.
diff --git a/src/wp-includes/class-wp-block-list.php b/src/wp-includes/class-wp-block-list.php
@@ -92,7 +92,7 @@ public function offsetExists( $offset ) {
 	public function offsetGet( $offset ) {
 		$block = $this->blocks[ $offset ];
 
-		if ( isset( $block ) && is_array( $block ) ) {
+		if ( isset( $block ) && ( is_array( $block ) || $block instanceof WP_Parsed_Block ) ) {
 			$block = new WP_Block( $block, $this->available_context, $this->registry );
 
 			$this->blocks[ $offset ] = $block;