From 990ad75ca8a45805495160fe99d3af8d4c9afeeb Mon Sep 17 00:00:00 2001
From: Raymond Hill <rhill@raymondhill.net>
Date: Mon, 26 Sep 2022 16:46:24 -0400
Subject: [PATCH] Redirect non-existing operators to a void operator

Related issue:
- https://github.com/uBlockOrigin/uBlock-issues/issues/2292

This will prevent unexpected oversezealous blocking if ever
this happens again. The internal void operator will ensure
no blocking takes place and issue a note about non-existing
operator to the dev tools console.
---
 src/js/contentscript-extra.js | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/src/js/contentscript-extra.js b/src/js/contentscript-extra.js
index 8a48b3d7a60f7..11cbc595a24ca 100644
--- a/src/js/contentscript-extra.js
+++ b/src/js/contentscript-extra.js
@@ -43,6 +43,14 @@ class PSelectorTask {
     }
 }
 
+class PSelectorVoidTask extends PSelectorTask {
+    constructor(task) {
+        super();
+        console.info(`uBO: :${task[0]}() operator does not exist`);
+    }
+    transpose() {
+    }
+}
 
 class PSelectorHasTextTask extends PSelectorTask {
     constructor(task) {
@@ -377,8 +385,7 @@ class PSelector {
         const tasks = [];
         if ( Array.isArray(o.tasks) === false ) { return; }
         for ( const task of o.tasks ) {
-            const ctor = this.operatorToTaskMap.get(task[0]);
-            if ( ctor === undefined ) { return; }
+            const ctor = this.operatorToTaskMap.get(task[0]) || PSelectorVoidTask;
             tasks.push(new ctor(task));
         }
         // Initialize only after all tasks have been successfully instantiated