feat: Add API controller exception wrapper for conversion methods

WebAPI/Controllers/ApiController.cs

@@ -75,8 +75,21 @@ namespace WebAPI.Controllers
 
                 if (parser.NumberOfSyntaxErrors == 0)
                 {
-                    CppActivityDiagramVisitor activityDiagramVisitor = new CppActivityDiagramVisitor(diagramBuilder, contextIdentifier, functionIdentifier);
-                    Console.WriteLine(activityDiagramVisitor.Visit(tree));
+                    try
+                    {
+                        CppActivityDiagramVisitor activityDiagramVisitor = new CppActivityDiagramVisitor(diagramBuilder, contextIdentifier, functionIdentifier);
+                        var result = activityDiagramVisitor.Visit(tree);
+                        Console.WriteLine(result);
+                    }
+                    catch(Exception e)
+                    {
+                        Console.WriteLine($"CppActivityDiagramVisitor: Error in visiting tree: {e.Message}");
+                        return BadRequest("CppActivityDiagramVisitor: Error in visiting tree");
+                    }
+                }
+                else
+                {
+                    return BadRequest("Syntax error in code");
                 }
 
                 var xmi = diagramBuilder.BuildDiagram();
@@ -128,8 +141,22 @@ namespace WebAPI.Controllers
 
                 if (parser.NumberOfSyntaxErrors == 0)
                 {
-                    CppClassDiagramVisitor classDiagramVisitor = new CppClassDiagramVisitor(diagramBuilder);
-                    Console.WriteLine(classDiagramVisitor.Visit(tree));
+                    try
+                    {
+                        CppClassDiagramVisitor classDiagramVisitor = new CppClassDiagramVisitor(diagramBuilder);
+                        var result = classDiagramVisitor.Visit(tree);
+                        Console.WriteLine(result);
+                    }
+                    catch (Exception e)
+                    {
+                        Console.WriteLine($"CppClassDiagramVisitor: Error in visiting tree: {e.Message}");
+                        return BadRequest("CppClassDiagramVisitor: Error in visiting tree");
+                    }
+
+                }
+                else
+                {
+                    return BadRequest("Syntax error in code");
                 }
 
                 var xmi = diagramBuilder.BuildDiagram();