add support: Sentence case, snake_case, Title_Case, lowercase, uppercase

Assets/EnumExtensionsTests/MyEnum.cs

@@ -25,4 +25,7 @@ public enum MyFlags : byte
     }
 
     static partial class MyFlagsExtensions { }
+
+    [EnumExtensions]
+    public enum MyEnum2 { _FirstCase, SecondCase, Third_Case, forth_case, fifthCase }
 }

Packages/ZBase.Foundation.EnumExtensions/Source~/ZBase.Foundation.EnumExtensions.SourceGen/SourceGen.Common/StringExtensions.cs

@@ -1,4 +1,9 @@
-namespace ZBase.Foundation.SourceGen
+using System;
+using System.Globalization;
+using System.Linq;
+using System.Text.RegularExpressions;
+
+namespace ZBase.Foundation.SourceGen
 {
     public static class StringExtensions
     {
@@ -18,5 +23,65 @@ public static string ToValidNamespace(this string value)
                 .Replace('>', 'ᐳ')
                 .Replace("[]", "Array")
                 ;
+
+        public static string ToTitleCase(this string value)
+        {
+            // Remove leading and trailing underscores
+            value = value.Trim('_');
+
+            // Split the string at capital letters or underscores
+            string[] words = Regex.Split(value, @"(?<!^)(?=[A-Z])|_");
+
+            // Create a TextInfo based on the "en-US" culture.
+            TextInfo textInfo = new CultureInfo("en-US", false).TextInfo;
+
+            // Convert to title case and filter out any empty entries
+            words = words
+                .Where(word => !string.IsNullOrEmpty(word)) // Remove any empty strings resulting from split
+                .Select(word => textInfo.ToTitleCase(word.ToLower())) // Convert each word to title case
+                .ToArray();
+
+            // Join all words with a single space and return
+            return string.Join(" ", words).Trim();
+        }
+
+        public static string ToSentenceCase(this string value)
+        {
+            // Remove leading and trailing underscores
+            value = value.Trim('_');
+
+            // Split the string at capital letters or underscores
+            string[] words = Regex.Split(value, @"(?<!^)(?=[A-Z])|_");
+
+            // Convert to lower case and capitalize the first letter of each word
+            words = words
+                .Where(word => !string.IsNullOrEmpty(word)) // Remove any empty strings resulting from split
+                .Select(word => {
+                    word = word.ToLower();
+                    return word.Length > 0 ? char.ToUpper(word[0]) + word.Substring(1) : word;
+                }) // Capitalize the first letter of each word
+                .ToArray();
+
+            // Join all words with a space and return
+            return string.Join(" ", words).Trim();
+        }
+
+        public static string ToSnakeCase(this string input)
+        {
+            // Remove leading and trailing underscores
+            input = input.Trim('_');
+
+            // Split the string at capital letters or underscores
+            string[] words = Regex.Split(input, @"(?<!^)(?=[A-Z])|_");
+
+            // Convert to lower case and filter out any empty entries
+            words = words
+                .Where(word => !string.IsNullOrEmpty(word)) // Remove any empty strings resulting from split
+                .Select(word => word.ToLower()) // Convert each word to lower case
+                .ToArray();
+
+            // Join all words with an underscore and return
+            return string.Join("_", words);
+        }
     }
 }