Reduce allocations

src/Jellyfin.Extensions/StringExtensions.cs

@@ -27,5 +27,39 @@ namespace Jellyfin.Extensions
 
             return count;
         }
+
+        /// <summary>
+        /// Returns the part on the left of the <c>needle</c>.
+        /// </summary>
+        /// <param name="haystack">The string to seek.</param>
+        /// <param name="needle">The needle to find.</param>
+        /// <returns>The part left of the <paramref name="needle" />.</returns>
+        public static ReadOnlySpan<char> LeftPart(this ReadOnlySpan<char> haystack, char needle)
+        {
+            var pos = haystack.IndexOf(needle);
+            return pos == -1 ? haystack : haystack[..pos];
+        }
+
+        /// <summary>
+        /// Returns the part on the right of the <c>needle</c>.
+        /// </summary>
+        /// <param name="haystack">The string to seek.</param>
+        /// <param name="needle">The needle to find.</param>
+        /// <returns>The part right of the <paramref name="needle" />.</returns>
+        public static ReadOnlySpan<char> RightPart(this ReadOnlySpan<char> haystack, char needle)
+        {
+            var pos = haystack.LastIndexOf(needle);
+            if (pos == -1)
+            {
+                return haystack;
+            }
+
+            if (pos == haystack.Length - 1)
+            {
+                return ReadOnlySpan<char>.Empty;
+            }
+
+            return haystack[(pos + 1)..];
+        }
     }
 }