From d9b50fcd514bf13c2253feb9efc1c0ce408bf584 Mon Sep 17 00:00:00 2001
From: Raymond Hill <rhill@raymondhill.net>
Date: Fri, 6 Jan 2023 09:54:11 -0500
Subject: [PATCH] Drop as invalid unknown argument-based pseudoclass operators

Related issue:
- https://github.com/uBlockOrigin/uBlock-issues/issues/2442

These invalid pseudoclass operators were still seen as
valid when mixed with procedural pseudoclass operators.
---
 src/js/static-filtering-parser.js | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/js/static-filtering-parser.js b/src/js/static-filtering-parser.js
index 6f2da5def..f91e75a25 100644
--- a/src/js/static-filtering-parser.js
+++ b/src/js/static-filtering-parser.js
@@ -1750,9 +1750,12 @@ Parser.prototype.SelectorCompiler = class {
             case 'IdSelector':
             case 'PseudoClassSelector':
             case 'PseudoElementSelector':
-            case 'TypeSelector':
-                prelude.push(this.astSerializePart(part));
+            case 'TypeSelector': {
+                const component = this.astSerializePart(part);
+                if ( component === undefined ) { return; }
+                prelude.push(component);
                 break;
+            }
             case 'ProceduralSelector': {
                 if ( prelude.length !== 0 ) {
                     let spath = prelude.join('');