Make the children conversion reusable

src/class-block-converter.php

@@ -112,6 +112,34 @@ public function __call( $name, $arguments ): ?Block {
 		};
 	}
 
+	/**
+	 * Convert the children of a node to blocks.
+	 *
+	 * @param DOMNode $node The node.
+	 * @return string The children as blocks.
+	 */
+	public function convert_with_children( DOMNode $node ): string {
+		$children = '';
+
+		// Recursively convert the children of the blockquote to blocks.
+		foreach ( $node->childNodes as $child ) {
+			$child_block = $this->{$child->nodeName}( $child );
+
+			if ( ! empty( $child_block ) ) {
+				$children .= $this->minify_block( (string) $child_block );
+			}
+		}
+
+		$node->nodeValue = '__CHILDREN__';
+
+		$content = static::get_node_html( $node );
+
+		// Replace the placeholder with the children.
+		$content = str_replace( '__CHILDREN__', $children, $content );
+
+		return $content;
+	}
+
 	/**
 	 * Magic function to convert to a string.
 	 */
@@ -153,27 +181,7 @@ protected function blockquote( DOMNode $node ): ?Block {
 			$node->setAttribute( 'class', 'wp-block-quote' );
 		}
 
-		$children = '';
-
-		// Recursively convert the children of the blockquote to blocks.
-		foreach ( $node->childNodes as $child ) {
-			$child_block = $this->{$child->nodeName}( $child );
-
-			if ( ! empty( $child_block ) ) {
-				$children .= $this->minify_block( (string) $child_block );
-			}
-		}
-
-		// Replace the children with a placeholder that will be replaced with
-		// the children after the blockquote is converted to block.
-		if ( ! empty( $node->nodeValue ) ) {
-			$node->nodeValue = '__CHILDREN__';
-		}
-
-		$content = static::get_node_html( $node );
-
-		// Replace the closing blockquote tag with the children.
-		$content = str_replace( '__CHILDREN__', $children, $content );
+		$content = $this->convert_with_children( $node );
 
 		if ( empty( $content ) ) {
 			return null;