From 9da071d471cdfc94e3d8d002d9fdec8450a80e80 Mon Sep 17 00:00:00 2001
From: Amy Worrall <amy.worrall@me.com>
Date: Sun, 23 Feb 2025 17:02:45 +0000
Subject: [PATCH] Fix for UTF8 character counting in class names

---
 Sources/Element.swift | 2 +-
 Sources/String.swift  | 4 ++++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/Sources/Element.swift b/Sources/Element.swift
index 2a205fd8..27d93508 100644
--- a/Sources/Element.swift
+++ b/Sources/Element.swift
@@ -1158,7 +1158,7 @@ open class Element: Node {
         var inClass: Bool = false
         var start: Int = 0
         for i in 0..<len {
-            if (classAttr.charAt(i).isWhitespace) {
+            if (classAttr.utf8CharAt(i).isWhitespace) {
                 if (inClass) {
                     // white space ends a class name, compare it with the requested one, ignore case
                     if (i - start == wantLen && classAttr.regionMatches(ignoreCase: true, selfOffset: start,
diff --git a/Sources/String.swift b/Sources/String.swift
index 9dc2fce3..34839f20 100644
--- a/Sources/String.swift
+++ b/Sources/String.swift
@@ -282,6 +282,10 @@ extension String {
         return self[i] as Character
     }
 
+    func utf8CharAt(_ i: Int) -> UTF8Char {
+      return self.utf8Array[i]
+    }
+
 	func substring(_ beginIndex: Int) -> String {
         return String.split(self, beginIndex, self.count-beginIndex)
     }