From 33d449d892912db72535634da49666460ab15320 Mon Sep 17 00:00:00 2001
From: Ilya <batata@mail.ru>
Date: Thu, 29 May 2025 18:52:23 +0300
Subject: [PATCH] =?UTF-8?q?=D0=94=D0=BE=D0=B1=D0=B0=D0=B2=D0=BB=D1=8F?=
 =?UTF-8?q?=D0=B5=D0=BC=20=D0=BF=D0=BE=D0=BB=D1=83=D1=87=D0=B5=D0=BD=D0=B8?=
 =?UTF-8?q?=D0=B5=20=D1=81=D0=B8=D0=BC=D0=B2=D0=BE=D0=BB=D0=B0=20getUtf8Ch?=
 =?UTF-8?q?arByIndex?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 include/utils/StringUtils.h |  2 ++
 src/utils/StringUtils.cpp   | 25 +++++++++++++++++++++++++
 2 files changed, 27 insertions(+)

diff --git a/include/utils/StringUtils.h b/include/utils/StringUtils.h
index 6d3afa15..62dca319 100644
--- a/include/utils/StringUtils.h
+++ b/include/utils/StringUtils.h
@@ -51,3 +51,5 @@ unsigned char ChartoHex(char ch);
 std::vector<String> splitStr(const String& str, const String& delimiter);
 
 bool strInVector(const String& str, const std::vector<String>& vec);
+
+String getUtf8CharByIndex(const String& utf8str, int index);
diff --git a/src/utils/StringUtils.cpp b/src/utils/StringUtils.cpp
index d6c8c3f7..80cfa61a 100644
--- a/src/utils/StringUtils.cpp
+++ b/src/utils/StringUtils.cpp
@@ -233,4 +233,29 @@ bool strInVector(const String& str, const std::vector<String>& vec) {
         if (vec[i] == str) return true;
     }
     return false;
+}
+
+String getUtf8CharByIndex(const String& utf8str, int index) {
+    if (index < 0) index = 0;
+    
+    int len = utf8str.length();
+    int charCount = 0;
+    int i = 0;
+    while (i < len) {
+        int charLen = 1;
+        unsigned char c = utf8str[i];
+        if ((c & 0x80) == 0x00) charLen = 1;           // 0xxxxxxx
+        else if ((c & 0xE0) == 0xC0) charLen = 2;      // 110xxxxx
+        else if ((c & 0xF0) == 0xE0) charLen = 3;      // 1110xxxx
+        else if ((c & 0xF8) == 0xF0) charLen = 4;      // 11110xxx
+
+        if (charCount == index) {
+            return utf8str.substring(i, i + charLen);
+        }
+
+        if (i + charLen >= len) return utf8str.substring(i, i + charLen);
+        i += charLen;
+        charCount++;
+    }
+    return "";
 }
\ No newline at end of file