From e8b4e6b726df97dc542752bf1f67f2e039229f5d Mon Sep 17 00:00:00 2001
From: Thilo Molitor <thilo@eightysoft.de>
Date: Mon, 7 Aug 2023 05:12:14 +0200
Subject: [PATCH] Implement :not() pseudo selector

This may be a dirty hack, but it seems to work well.
---
 src/Css/Stylesheet.php | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/Css/Stylesheet.php b/src/Css/Stylesheet.php
index 852fc5e16..f61ee733f 100644
--- a/src/Css/Stylesheet.php
+++ b/src/Css/Stylesheet.php
@@ -649,6 +649,20 @@ protected function selectorToXpath(string $selector, bool $firstPass = false): ?
                             $query .= "[" . implode(" or ", $elements) . "]";
                             break;
 
+                        case "not":
+                            $p = $i + 1;
+                            $length = strpos($selector, ")", $i) - $p;
+                            $i += $length + 1;
+                            $matchList = trim(mb_substr($selector, $p, $length));
+                            $subquery = $this->selectorToXpath($matchList, true)['query'];
+                            if(substr($subquery, 0, 4) != '//*[')
+                            {
+                                error_log("unsupported dompdf css subquery in :not() pseudoclass: $subquery");
+                                return null;		//not supported
+                            }
+                            $query .= "[not(".substr($subquery, 4, -1).")]";
+                            break;
+
                         // https://www.w3.org/TR/selectors-3/#UIstates
                         case "disabled":
                         case "checked":