Add comment toggle feature

src/main/java/app/controllers/EditorController.java

@@ -15,6 +15,7 @@ import org.fxmisc.richtext.model.TwoDimensional.Position;
 
 import app.events.EditorChangedEvent;
 import app.events.LanguageChangedEvent;
+import app.events.ToggleCommentEvent;
 import app.events.FileSaveStateChangedEvent;
 import app.model.Model;
 import app.service.LanguageOperations;
@@ -63,6 +64,41 @@ public class EditorController implements Initializable, Controller {
     this.setHighlighting(LanguageOperations.syntaxHighlight(this.editor.getText(), Model.getLanguage()));
   }
 
+  /**
+   * Uses Model.language to determine whether the current line/selection
+   * is commented or not, and toggles the comment.
+   */
+  private void toggleComment() {
+    if (editor.getSelectedText().equals("")) {
+      String currentLine = editor.getText(editor.getCurrentParagraph());
+
+      String newText;
+      if (Model.getLanguage().isCommentedLine(currentLine))
+        newText = Model.getLanguage().unCommentLine(currentLine);
+      else
+        newText = Model.getLanguage().commentLine(currentLine);
+
+      editor.replaceText(
+        editor.getCurrentParagraph(),
+        0,
+        editor.getCurrentParagraph(),
+        currentLine.length(),
+        newText
+      );
+
+    } else { // Comment selection
+
+      String newText;
+      if (Model.getLanguage().isCommentedSelection(editor.getSelectedText()))
+        newText = Model.getLanguage().unCommentSelection(editor.getSelectedText());
+      else
+        newText = Model.getLanguage().commentSelection(editor.getSelectedText());
+
+      editor.replaceSelection(newText);
+
+    }
+  }
+
   /**
    * Handles the event whenever the content of the editor is changed.
    */
@@ -71,7 +107,6 @@ public class EditorController implements Initializable, Controller {
     Position pos = this.editor.offsetToPosition(offset, Bias.Forward);
     this.eventBus.post(new EditorChangedEvent(pos.getMajor() + 1, pos.getMinor()));
 
-
     if (Model.getFileIsSaved())
       this.eventBus.post(new FileSaveStateChangedEvent(false));
 
@@ -80,11 +115,20 @@ public class EditorController implements Initializable, Controller {
 
   /**
    * Refreshes the editor whenever the language is changed.
-   * @param event Which language was switched to
+   * @param event
    */
   @Subscribe
   private void handle(LanguageChangedEvent event) {
     this.refreshHighlighting();
   }
 
+  /**
+   * Toggles a language specific comment of the line/selection
+   * @param event
+   */
+  @Subscribe
+  private void handle(ToggleCommentEvent event) {
+    this.toggleComment();
+  }
+
 }