Options can now be removed from a configuration file; added more unit tests to cover all the code paths

git-svn-id: file:///srv/devel/repo-conversion/nusu@306 d2e56fa2-650e-0410-a79f-9358c0239efd

Source/Settings/ConfigurationFileStore.Test.cs

@@ -244,6 +244,144 @@ namespace Nuclex.Support.Settings {
       Assert.That(save(configurationFile), Contains.Substring("[general]"));
     }
 
+    /// <summary>
+    ///   Verifies that accessing an option that doesn't exist throws an exception
+    /// </summary>
+    [Test]
+    public void AccessingNonExistingOptionThrowsException() {
+      var configurationFile = new ConfigurationFileStore();
+
+      Assert.That(
+        () => configurationFile.Get<string>(null, "doesn't exist"),
+        Throws.Exception.AssignableTo<KeyNotFoundException>()
+      );
+    }
+
+    /// <summary>
+    ///   Verifies that accessing a category that doesn't exist throws an exception
+    /// </summary>
+    [Test]
+    public void AccessingNonExistingCategoryThrowsException() {
+      var configurationFile = new ConfigurationFileStore();
+      configurationFile.Set<string>(null, "test", "123");
+
+      Assert.That(
+        () => configurationFile.Get<string>("doesn't exist", "test"),
+        Throws.Exception.AssignableTo<KeyNotFoundException>()
+      );
+    }
+
+    /// <summary>
+    ///   Verifies that it's possible to enumerate a category that doesn't exist
+    /// </summary>
+    [Test]
+    public void NonExistingCategoryCanBeEnumerated() {
+      var configurationFile = new ConfigurationFileStore();
+
+      Assert.That(configurationFile.EnumerateOptions("doesn't exist"), Is.Empty);
+    }
+
+    /// <summary>
+    ///   Verifies that it's possible to create an option without a value
+    /// </summary>
+    [Test]
+    public void ValuelessOptionsCanBeCreated() {
+      var configurationFile = new ConfigurationFileStore();
+
+      configurationFile.Set<string>(null, "test", null);
+      Assert.That(configurationFile.Get<string>(null, "test"), Is.Null.Or.Empty);
+    }
+
+    /// <summary>
+    ///   Verifies that it's possible to assign an empty value to an option
+    /// </summary>
+    [Test]
+    public void OptionValueCanBeCleared() {
+      string fileContents = "test = 123 ; comment";
+      ConfigurationFileStore configurationFile = load(fileContents);
+
+      configurationFile.Set<string>(null, "test", null);
+      Assert.That(configurationFile.Get<string>(null, "test"), Is.Null.Or.Empty);
+    }
+
+    /// <summary>
+    ///   Verifies that it's possible to assign an empty value to an option
+    /// </summary>
+    [Test]
+    public void OptionsCanBeRemoved() {
+      var configurationFile = new ConfigurationFileStore();
+      configurationFile.Set<string>(null, "test", null);
+
+      Assert.That(configurationFile.Remove(null, "test"), Is.True);
+    }
+
+    /// <summary>
+    ///   Verifies that it's possible to assign an empty value to an option
+    /// </summary>
+    [Test]
+    public void RemovingOptionShiftsFollowingOptionsUp() {
+      string fileContents =
+        "first = 1\r\n" +
+        "second = 2";
+      ConfigurationFileStore configurationFile = load(fileContents);
+
+      Assert.That(configurationFile.Remove(null, "first"), Is.True);
+      configurationFile.Set<string>(null, "second", "yay! first!");
+
+      Assert.That(save(configurationFile), Has.No.ContainsSubstring("1"));
+      Assert.That(save(configurationFile), Contains.Substring("second"));
+      Assert.That(save(configurationFile), Contains.Substring("yay! first!"));
+    }
+
+    /// <summary>
+    ///   Verifies that it's not an error to remove an option from a non-existing category
+    /// </summary>
+    [Test]
+    public void CanRemoveOptionFromNonExistingCategory() {
+      var configurationFile = new ConfigurationFileStore();
+      Assert.That(configurationFile.Remove("nothing", "first"), Is.False);
+    }
+
+    /// <summary>
+    ///   Verifies that it's not an error to remove a non-existing option
+    /// </summary>
+    [Test]
+    public void CanRemoveNonExistingOption() {
+      var configurationFile = new ConfigurationFileStore();
+      Assert.That(configurationFile.Remove(null, "first"), Is.False);
+    }
+
+    /// <summary>
+    ///   Verifies that it's not an error to remove a non-existing option
+    /// </summary>
+    [
+      Test,
+      TestCase("text = world", typeof(string)),
+      TestCase("short=9", typeof(int)),
+      TestCase("integer = 123", typeof(int)),
+      TestCase("integer = 123  ", typeof(int)),
+      TestCase("float = 123.45", typeof(float)),
+      TestCase("float = 123.45  ", typeof(float)),
+      TestCase("boolean = true", typeof(bool)),
+      TestCase("boolean = false", typeof(bool)),
+      TestCase("boolean = yes", typeof(bool)),
+      TestCase("boolean = no", typeof(bool))
+    ]
+    public void OptionTypeCanBeIdentified(string assignment, Type expectedType) {
+      ConfigurationFileStore configurationFile = load(assignment);
+
+      OptionInfo info;
+      using(
+        IEnumerator<OptionInfo> enumerator = configurationFile.EnumerateOptions().GetEnumerator()
+      ) {
+        Assert.That(enumerator.MoveNext(), Is.True);
+        info = enumerator.Current;
+        Assert.That(enumerator.MoveNext(), Is.False);
+      }
+
+      Assert.That(info.OptionType, Is.EqualTo(expectedType));
+    }
+
     /// <summary>Loads a configuration file from a string</summary>
     /// <param name="fileContents">Contents of the configuration file</param>
     /// <returns>The configuration file loaded from the string</returns>

Source/Settings/ConfigurationFileStore.cs

@@ -103,6 +103,9 @@ namespace Nuclex.Support.Settings {
     /// <returns>An enumerable list of all options in the category</returns>
     public IEnumerable<OptionInfo> EnumerateOptions(string category = null) {
       Category enumeratedCategory = getCategoryByName(category);
+      if(enumeratedCategory == null) {
+        yield break;
+      }
 
       foreach(Option option in this.RootCategory.OptionLookup.Values) {
         OptionInfo optionInfo = new OptionInfo() {
@@ -147,15 +150,16 @@ namespace Nuclex.Support.Settings {
     /// </returns>
     public bool TryGet<TValue>(string category, string optionName, out TValue value) {
       Category containingCategory = getCategoryByName(category);
-
-      Option option;
-      if(containingCategory.OptionLookup.TryGetValue(optionName, out option)) {
-        value = (TValue)Convert.ChangeType(option.OptionValue.ToString(), typeof(TValue));
-        return true;
-      } else {
-        value = default(TValue);
-        return false;
+      if(containingCategory != null) {
+        Option option;
+        if(containingCategory.OptionLookup.TryGetValue(optionName, out option)) {
+          value = (TValue)Convert.ChangeType(option.OptionValue.ToString(), typeof(TValue));
+          return true;
+        }
       }
+
+      value = default(TValue);
+      return false;
     }
 
     /// <summary>Saves an option in the settings store</summary>
@@ -164,30 +168,22 @@ namespace Nuclex.Support.Settings {
     /// <param name="optionName">Name of the option that will be saved</param>
     /// <param name="value">The value under which the option will be saved</param>
     public void Set<TValue>(string category, string optionName, TValue value) {
-      Category targetCategory;
-      bool optionMightExist;
-
-      if(string.IsNullOrEmpty(category)) {
-        targetCategory = this.RootCategory;
-        optionMightExist = true;
-      } else if(this.categoryLookup.TryGetValue(category, out targetCategory)) {
-        optionMightExist = true;
-      } else {
-        targetCategory = createCategory(category);
-        optionMightExist = false;
-      }
-
       string valueAsString = (string)Convert.ChangeType(
         value, typeof(string), CultureInfo.InvariantCulture
       );
 
+      Category targetCategory;
+      if(string.IsNullOrEmpty(category)) {
+        targetCategory = this.RootCategory;
+      } else if(!this.categoryLookup.TryGetValue(category, out targetCategory)) {
+        targetCategory = createCategory(category);
+        createOption(targetCategory, optionName, valueAsString);
+        return;
+      }
+
       Option targetOption;
-      if(optionMightExist) {
-        if(targetCategory.OptionLookup.TryGetValue(optionName, out targetOption)) {
-          changeOption(targetCategory, targetOption, valueAsString);
-        } else {
-          createOption(targetCategory, optionName, valueAsString);
-        }
+      if(targetCategory.OptionLookup.TryGetValue(optionName, out targetOption)) {
+        changeOption(targetCategory, targetOption, valueAsString);
       } else {
         createOption(targetCategory, optionName, valueAsString);
       }
@@ -198,7 +194,26 @@ namespace Nuclex.Support.Settings {
     /// <param name="optionName">Name of the option that will be removed</param>
     /// <returns>True if the option was found and removed</returns>
     public bool Remove(string category, string optionName) {
-      throw new NotImplementedException();
+      Category sourceCategory = getCategoryByName(category);
+      if(sourceCategory == null) {
+        return false;
+      }
+
+      Option option;
+      if(!sourceCategory.OptionLookup.TryGetValue(optionName, out option)) {
+        return false;
+      }
+
+      sourceCategory.Lines.RemoveAt(option.LineIndex);
+      sourceCategory.OptionLookup.Remove(optionName);
+
+      foreach(Option shiftedOption in sourceCategory.OptionLookup.Values) {
+        if(shiftedOption.LineIndex > option.LineIndex) {
+          --shiftedOption.LineIndex;
+        }
+      }
+
+      return true;
     }
 
     /// <summary>Looks a category up by its name</summary>
@@ -212,9 +227,7 @@ namespace Nuclex.Support.Settings {
       if(string.IsNullOrEmpty(categoryName)) {
         category = this.RootCategory;
       } else if(!this.categoryLookup.TryGetValue(categoryName, out category)) {
-        throw new KeyNotFoundException(
-          "There is no category named '" + categoryName + "' in the configuration file"
-        );
+        return null;
       }
 
       return category;
@@ -281,7 +294,7 @@ namespace Nuclex.Support.Settings {
       string line = option.OptionValue.Text;
       {
         StringBuilder builder = new StringBuilder(
-          line.Length - option.OptionValue.Count + newValue.Length
+          line.Length - option.OptionValue.Count + newValueLength
         );
 
         // Stuff before the value