✨ feature: Code Case Extensions (#57)

* Create common code case extensions

* Create ToCamelCase Extension

* Create ToKebabCase Extension

* Create ToSnakeCase Extension

* Create ToPascalCase Extension

* Create ToTrainCase Extension

* Global usings

* Create Tests for ToCase Extensions

Author: TylerCarrol

TJC.StringExtensions.Tests/Cases/CamelCaseExtensionsTests.cs

@@ -46,4 +46,18 @@ public void SplitCamelCase_FirstLetterUppercase_SplitsWithSpace()
         // Assert
         Assert.AreEqual(expected, result);
     }
+
+    [TestMethod]
+    public void ToCamelCaseTest()
+    {
+        // Arrange
+        var input = "Camel Case Extensions";
+        var expected = "camelCaseExtensions";
+
+        // Act
+        var result = input.ToCamelCase();
+
+        // Assert
+        Assert.AreEqual(expected, result);
+    }
 }

TJC.StringExtensions.Tests/Cases/KebabCaseExtensionsTests.cs

@@ -0,0 +1,21 @@
+using TJC.StringExtensions.Cases;
+
+namespace TJC.StringExtensions.Tests.Cases;
+
+[TestClass]
+public class KebabCaseExtensionsTests
+{
+    [TestMethod]
+    public void ToKebabCaseTest()
+    {
+        // Arrange
+        var input = "Kebab Case Extensions";
+        var expected = "kebab-case-extensions";
+
+        // Act
+        var result = input.ToKebabCase();
+
+        // Assert
+        Assert.AreEqual(expected, result);
+    }
+}

TJC.StringExtensions.Tests/Cases/PascalCaseExtensionsTests.cs

@@ -0,0 +1,21 @@
+using TJC.StringExtensions.Cases;
+
+namespace TJC.StringExtensions.Tests.Cases;
+
+[TestClass]
+public class PascalCaseExtensionsTests
+{
+    [TestMethod]
+    public void ToPascalCaseTest()
+    {
+        // Arrange
+        var input = "Pascal Case Extensions";
+        var expected = "PascalCaseExtensions";
+
+        // Act
+        var result = input.ToPascalCase();
+
+        // Assert
+        Assert.AreEqual(expected, result);
+    }
+}

TJC.StringExtensions.Tests/Cases/SnakeCaseExtensionsTests.cs

@@ -0,0 +1,21 @@
+using TJC.StringExtensions.Cases;
+
+namespace TJC.StringExtensions.Tests.Cases;
+
+[TestClass]
+public class SnakeCaseExtensionsTests
+{
+    [TestMethod]
+    public void ToSnakeCaseTest()
+    {
+        // Arrange
+        var input = "Snake Case Extensions";
+        var expected = "snake_case_extensions";
+
+        // Act
+        var result = input.ToSnakeCase();
+
+        // Assert
+        Assert.AreEqual(expected, result);
+    }
+}

TJC.StringExtensions.Tests/Cases/TrainCaseExtensionsTests.cs

@@ -0,0 +1,21 @@
+using TJC.StringExtensions.Cases;
+
+namespace TJC.StringExtensions.Tests.Cases;
+
+[TestClass]
+public class TrainCaseExtensionsTests
+{
+    [TestMethod]
+    public void ToTrainCaseTest()
+    {
+        // Arrange
+        var input = "Train Case Extensions";
+        var expected = "Train-Case-Extensions";
+
+        // Act
+        var result = input.ToTrainCase();
+
+        // Assert
+        Assert.AreEqual(expected, result);
+    }
+}

TJC.StringExtensions/Cases/CamelCaseExtensions.cs

@@ -9,16 +9,28 @@ public static class CamelCaseExtensions
 {
     /// <summary>
     /// Split camel case with a separator (typically a space).
-    /// <para></para>
-    /// Example: "camelCaseExtensions" becomes "camel Case Extensions"
     /// </summary>
     /// <param name="input"></param>
     /// <param name="separator"></param>
-    /// <returns></returns>
+    /// <returns>"camelCaseExtensions" becomes "camel Case Extensions"</returns>
     public static string SplitCamelCase(this string? input, string separator = " ")
     {
         if (string.IsNullOrEmpty(input))
             return string.Empty;
         return string.Concat(input.Select((x, i) => i > 0 && char.IsUpper(x) ? $"{separator}{x}" : x.ToString()));
     }
+
+    /// <summary>
+    /// Convert any case format to camel case.
+    /// </summary>
+    /// <param name="input"></param>
+    /// <returns>camelCase</returns>
+    public static string ToCamelCase(this string input)
+    {
+        var words = input.CodeCaseToWords();
+        var result = new StringBuilder(words[0].ToLower());
+        for (int i = 1; i < words.Length; i++)
+            result.Append(char.ToUpper(words[i][0]) + words[i][1..].ToLower());
+        return result.ToString();
+    }
 }

TJC.StringExtensions/Cases/CodeCaseExtensions.cs

@@ -0,0 +1,41 @@
+namespace TJC.StringExtensions.Cases;
+
+/// <summary>
+/// Case extensions for strings.
+/// </summary>
+public static partial class CodeCaseExtensions
+{
+    private static readonly char[] _separator = [' ', '_', '-'];
+
+    /// <summary>
+    /// Splits any code case format with a separator.
+    /// </summary>
+    /// <param name="input"></param>
+    /// <param name="separator"></param>
+    /// <returns></returns>
+    public static string SplitCodeCase(this string input, string separator = " ")
+    {
+        if (string.IsNullOrEmpty(input))
+            return string.Empty;
+        return string.Join(separator, input.CodeCaseToWords());
+    }
+
+    /// <summary>
+    /// Convert any code case format to words array.
+    /// </summary>
+    /// <param name="input"></param>
+    /// <returns></returns>
+    public static string[] CodeCaseToWords(this string input)
+    {
+        if (string.IsNullOrWhiteSpace(input))
+            return [];
+        // Add spaces around transitions (camelCase, PascalCase) and split by space, hyphen, or underscore        
+        var spaced = CaseWordSplitter.Replace(input, " ");
+        return spaced.Split(_separator, StringSplitOptions.RemoveEmptyEntries);
+    }
+
+    private static readonly Regex CaseWordSplitter = CaseWordSplitterRegex();
+
+    [GeneratedRegex(@"[a-z][A-Z]|[_\- ]", RegexOptions.Compiled)]
+    private static partial Regex CaseWordSplitterRegex();
+}

TJC.StringExtensions/Cases/KebabCaseExtensions.cs

@@ -0,0 +1,17 @@
+namespace TJC.StringExtensions.Cases;
+
+/// <summary>
+/// Kebab case extensions for strings.
+/// <para></para>
+/// Example of kebab case: "kebab-case-extensions"
+/// </summary>
+public static class KebabCaseExtensions
+{
+    /// <summary>
+    /// Convert any case format to kebab case.
+    /// </summary>
+    /// <param name="input"></param>
+    /// <returns>kebab-case</returns>
+    public static string ToKebabCase(this string input) =>
+        string.Join("-", input.CodeCaseToWords()).ToLower();
+}

TJC.StringExtensions/Cases/PascalCaseExtensions.cs

@@ -0,0 +1,23 @@
+namespace TJC.StringExtensions.Cases;
+
+/// <summary>
+/// Pascal case extensions for strings.
+/// <para></para>
+/// Example of pascal case: "PascalCaseExtensions"
+/// </summary>
+public static class PascalCaseExtensions
+{
+    /// <summary>
+    /// Convert any case format to pascal case.
+    /// </summary>
+    /// <param name="input"></param>
+    /// <returns>PascalCase</returns>
+    public static string ToPascalCase(this string input)
+    {
+        var words = input.CodeCaseToWords();
+        var result = new StringBuilder();
+        foreach (var word in words)
+            result.Append(char.ToUpper(word[0]) + word[1..].ToLower());
+        return result.ToString();
+    }
+}

TJC.StringExtensions/Cases/SnakeCaseExtensions.cs

@@ -0,0 +1,17 @@
+namespace TJC.StringExtensions.Cases;
+
+/// <summary>
+/// Snake case extensions for strings.
+/// <para></para>
+/// Example of snake case: "snake-case-extensions"
+/// </summary>
+public static class SnakeCaseExtensions
+{
+    /// <summary>
+    /// Convert any case format to snake case.
+    /// </summary>
+    /// <param name="input"></param>
+    /// <returns>snake_case</returns>
+    public static string ToSnakeCase(this string input) =>
+        string.Join("_", input.CodeCaseToWords()).ToLower();
+}