StringToTitleCase: .NET 10, culture-safe all-caps fix and minor-words helper

strings-csharp/StringToTitleCase/StringToTitleCase/Program.cs

@@ -1,21 +1,25 @@
-using System;
-using System.Globalization;
+using System.Globalization;
+using StringToTitleCase;
 
-namespace StringToTitleCase
-{
-    class Program
-    {
-        static void Main(string[] args)
-        {
-            var textinfo = new CultureInfo("en-US", false).TextInfo;
+var textinfo = new CultureInfo("en-US", false).TextInfo;
 
-            var textInfo = CultureInfo.CurrentCulture.TextInfo;
+Console.WriteLine(textinfo.ToTitleCase("a tale oF tWo citIes"));
+Console.WriteLine(textinfo.ToTitleCase("harry potter and the Deathly hallows"));
 
-            Console.WriteLine(textinfo.ToTitleCase("a tale oF tWo citIes"));
+Console.WriteLine(textinfo.ToTitleCase("OLIVER TWIST"));
+Console.WriteLine(textinfo.ToTitleCase(textinfo.ToLower("OLIVER TWIST")));
+Console.WriteLine(textinfo.ToTitleCase(textinfo.ToLower("THE NASA MISSION")));
 
-            Console.WriteLine(textinfo.ToTitleCase("harry potter and the Deathly hallows"));
+Console.WriteLine("a tale oF tWo citIes".ToTitleCaseWithMinorWords(textinfo));
+Console.WriteLine("harry potter and the Deathly hallows".ToTitleCaseWithMinorWords(textinfo));
 
-            Console.WriteLine(textinfo.ToTitleCase("OLIVER TWIST".ToLower()));
-        }
-    }
-}
+Console.OutputEncoding = System.Text.Encoding.UTF8;
+var turkish = new CultureInfo("tr-TR", false).TextInfo;
+Console.WriteLine(turkish.ToTitleCase("a tale oF tWo citIes"));
+Console.WriteLine(turkish.ToTitleCase("istanbul"));
+Console.WriteLine(CultureInfo.InvariantCulture.TextInfo.ToTitleCase("a tale oF tWo citIes"));
+
+Console.WriteLine(textinfo.ToTitleCase("the 2nd edition"));
+Console.WriteLine(textinfo.ToTitleCase("my iPhone"));
+Console.WriteLine(textinfo.ToTitleCase("mcdonald's menu"));
+Console.WriteLine(textinfo.ToTitleCase("x-ray vision"));

strings-csharp/StringToTitleCase/StringToTitleCase/StringToTitleCase.csproj

@@ -2,7 +2,9 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net10.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
   </PropertyGroup>
 
 </Project>

strings-csharp/StringToTitleCase/StringToTitleCase/TitleCaseExtensions.cs

@@ -0,0 +1,26 @@
+using System.Globalization;
+
+namespace StringToTitleCase;
+
+public static class TitleCaseExtensions
+{
+    private static readonly HashSet<string> MinorWords = new(StringComparer.OrdinalIgnoreCase)
+    {
+        "a", "an", "and", "as", "at", "but", "by", "for", "in", "nor", "of", "on", "or", "the", "to"
+    };
+
+    public static string ToTitleCaseWithMinorWords(this string input, TextInfo textInfo)
+    {
+        var words = textInfo.ToTitleCase(textInfo.ToLower(input)).Split(' ');
+
+        for (var i = 1; i < words.Length - 1; i++)
+        {
+            if (MinorWords.Contains(words[i]))
+            {
+                words[i] = textInfo.ToLower(words[i]);
+            }
+        }
+
+        return string.Join(' ', words);
+    }
+}

strings-csharp/StringToTitleCase/StringToTitleCaseUnitTest/StringToTitleCaseUnitTest.cs

@@ -1,31 +1,84 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
 using System.Globalization;
+using StringToTitleCase;
 
-namespace StringToTitleCaseUnitTest
+namespace StringToTitleCaseUnitTest;
+
+[TestClass]
+public class StringToTitleCaseUnitTest
 {
-    [TestClass]
-    public class StringToTitleCaseUnitTest
+    private readonly TextInfo textInfo = new CultureInfo("en-US", false).TextInfo;
+
+    [TestMethod]
+    public void GivenToTitleCase_WhenStringIsPassed_ConversionToTitleCaseSuccessful()
     {
-        private readonly TextInfo textInfo = CultureInfo.CurrentCulture.TextInfo;
+        Assert.AreEqual("A Tale Of Two Cities", textInfo.ToTitleCase("a tale oF tWo citIes"));
 
-        [TestMethod]
-        public void GivenToTitleCase_WhenStringIsPassed_CoversionToTitleCaseSuccessful()
-        {
-            Assert.AreEqual("A Tale Of Two Cities", textInfo.ToTitleCase("a tale oF tWo citIes"));
+        Assert.AreEqual("Harry Potter And The Deathly Hallows", textInfo.ToTitleCase("harry potter and the Deathly hallows"));
+    }
 
-            Assert.AreEqual("Harry Potter And The Deathly Hallows", textInfo.ToTitleCase("harry potter and the Deathly hallows"));
-        }
+    [TestMethod]
+    public void GivenToTitleCase_WhenWordWithAllUpperCaseIsPassed_ConversionToTitleCaseNotSuccessful()
+    {
+        Assert.AreEqual("OLIVER TWIST", textInfo.ToTitleCase("OLIVER TWIST"));
+    }
 
-        [TestMethod]
-        public void GivenToTitleCase_WhenWordWithAllUpperCaseIsPassed_ConversionToTitleCaseNotSuccessful()
+    [TestMethod]
+    public void GivenToTitleCase_WhenWordWithAllUpperCaseIsPassed_ConversionToTitleCaseSuccessful()
+    {
+        Assert.AreEqual("Oliver Twist", textInfo.ToTitleCase(textInfo.ToLower("OLIVER TWIST")));
+    }
+
+    [TestMethod]
+    public void GivenToTitleCase_WhenAcronymIsLowercasedFirst_AcronymIsLost()
+    {
+        Assert.AreEqual("The NASA Mission", textInfo.ToTitleCase("the NASA mission"));
+
+        Assert.AreEqual("The Nasa Mission", textInfo.ToTitleCase(textInfo.ToLower("THE NASA MISSION")));
+    }
+
+    [TestMethod]
+    public void GivenCurrentCultureIsTurkish_WhenStringToLowerIsUsed_DotlessIAppears()
+    {
+        var original = CultureInfo.CurrentCulture;
+        try
         {
-            Assert.AreNotEqual("Oliver Twist", textInfo.ToTitleCase("OLIVER TWIST"));
-        }
+            CultureInfo.CurrentCulture = new CultureInfo("tr-TR");
 
-        [TestMethod]
-        public void GivenToTitleCase_WhenWordWithAllUpperCaseIsPassed_ConversionToTitleCaseSuccessful()
+            Assert.AreEqual("Olıver Twıst", textInfo.ToTitleCase("OLIVER TWIST".ToLower()));
+            Assert.AreEqual("Oliver Twist", textInfo.ToTitleCase(textInfo.ToLower("OLIVER TWIST")));
+        }
+        finally
         {
-            Assert.AreEqual("Oliver Twist", textInfo.ToTitleCase("OLIVER TWIST".ToLower()));
+            CultureInfo.CurrentCulture = original;
         }
     }
+
+    [TestMethod]
+    public void GivenToTitleCaseWithMinorWords_WhenStringIsPassed_MinorWordsStayLowercase()
+    {
+        Assert.AreEqual("A Tale of Two Cities", "a tale oF tWo citIes".ToTitleCaseWithMinorWords(textInfo));
+
+        Assert.AreEqual("Harry Potter and the Deathly Hallows", "harry potter and the Deathly hallows".ToTitleCaseWithMinorWords(textInfo));
+
+        Assert.AreEqual("The Lord of the Rings", "the lord of the rings".ToTitleCaseWithMinorWords(textInfo));
+    }
+
+    [TestMethod]
+    public void GivenToTitleCase_WhenCultureIsTurkish_ResultUsesTurkishCasing()
+    {
+        var turkish = new CultureInfo("tr-TR", false).TextInfo;
+
+        Assert.AreEqual("A Tale Of Two Citıes", turkish.ToTitleCase("a tale oF tWo citIes"));
+        Assert.AreEqual("İstanbul", turkish.ToTitleCase("istanbul"));
+        Assert.AreEqual("A Tale Of Two Cities", CultureInfo.InvariantCulture.TextInfo.ToTitleCase("a tale oF tWo citIes"));
+    }
+
+    [TestMethod]
+    public void GivenToTitleCase_WhenWordHasDigitsOrInnerCapitals_ResultIsNotWhatAHumanWrites()
+    {
+        Assert.AreEqual("The 2Nd Edition", textInfo.ToTitleCase("the 2nd edition"));
+        Assert.AreEqual("My Iphone", textInfo.ToTitleCase("my iPhone"));
+        Assert.AreEqual("Mcdonald's Menu", textInfo.ToTitleCase("mcdonald's menu"));
+        Assert.AreEqual("X-Ray Vision", textInfo.ToTitleCase("x-ray vision"));
+    }
 }

strings-csharp/StringToTitleCase/StringToTitleCaseUnitTest/StringToTitleCaseUnitTest.csproj

@@ -1,16 +1,21 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net6.0</TargetFramework>
-
+    <TargetFramework>net10.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
     <IsPackable>false</IsPackable>
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.9.4" />
-    <PackageReference Include="MSTest.TestAdapter" Version="2.2.3" />
-    <PackageReference Include="MSTest.TestFramework" Version="2.2.3" />
-    <PackageReference Include="coverlet.collector" Version="3.0.2" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.11.0" />
+    <PackageReference Include="MSTest.TestAdapter" Version="4.5.2" />
+    <PackageReference Include="MSTest.TestFramework" Version="4.5.2" />
+    <PackageReference Include="coverlet.collector" Version="10.1.0" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\StringToTitleCase\StringToTitleCase.csproj" />
   </ItemGroup>
 
 </Project>