Simplify Tower (C#) folder structure

90_Tower/csharp/UI/Input.cs

@@ -0,0 +1,85 @@
+using System;
+using System.Collections.Generic;
+
+namespace Tower.UI
+{
+    // Provides input methods which emulate the BASIC interpreter's keyboard input routines
+    internal static class Input
+    {
+        private static void Prompt(string text = "") => Console.Write($"{text}? ");
+
+        internal static bool ReadYesNo(string prompt, string retryPrompt)
+        {
+            var response = ReadString(prompt);
+
+            while (true)
+            {
+                if (response.Equals("No", StringComparison.InvariantCultureIgnoreCase)) { return false; }
+                if (response.Equals("Yes", StringComparison.InvariantCultureIgnoreCase)) { return true; }
+                response = ReadString(retryPrompt);
+            }
+        }
+
+        internal static bool TryReadNumber(Prompt prompt, out int number)
+        {
+            var message = prompt.Message;
+
+            for (int retryCount = 0; retryCount <= prompt.RetriesAllowed; retryCount++)
+            {
+                if (retryCount > 0) { Console.WriteLine(prompt.RetryMessage); }
+
+                if (prompt.TryValidateResponse(ReadNumber(message), out number)) { return true; }
+
+                if (!prompt.RepeatPrompt) { message = ""; }
+            }
+
+            Console.WriteLine(prompt.QuitMessage);
+
+            number = 0;
+            return false;
+        }
+
+        private static float ReadNumber(string prompt)
+        {
+            Prompt(prompt);
+
+            while (true)
+            {
+                var inputValues = ReadStrings();
+
+                if (TryParseNumber(inputValues[0], out var number))
+                {
+                    if (inputValues.Length > 1)
+                    {
+                        Console.WriteLine("!Extra input ingored");
+                    }
+
+                    return number;
+                }
+            }
+        }
+
+        private static string ReadString(string prompt)
+        {
+            Prompt(prompt);
+
+            var inputValues = ReadStrings();
+            if (inputValues.Length > 1)
+            {
+                Console.WriteLine("!Extra input ingored");
+            }
+            return inputValues[0];
+        }
+
+        private static string[] ReadStrings() => Console.ReadLine().Split(',', StringSplitOptions.TrimEntries);
+
+        private static bool TryParseNumber(string text, out float number)
+        {
+            if (float.TryParse(text, out number)) { return true; }
+
+            Console.WriteLine("!Number expected - retry input line");
+            number = default;
+            return false;
+        }
+    }
+}