2016 Update

Task/Mad-Libs/C-sharp/mad-libs.cs

@@ -1,25 +1,70 @@
 using System;
-using System.Collections.Generic;
+using System.Linq;
 using System.Text;
-using System.Threading.Tasks;
-namespace madLibs {
-    class Program {
-        static void Main(string[] args) {
-            string name, sex, addThis, thing;
-            bool isMale = false;
-            Console.Write("Enter a name: ");
-            name = Console.ReadLine();
-            while(isMale == false) {
-                Console.Write("Is that a male or female name? [m/f] ");
-                sex = Console.ReadLine().ToLower().ToCharArray()[0].ToString();
-                if(sex == "m") { isMale = true; } else if(sex == "f") { break; }
-            }
-            if (isMale){ addThis = "He "; }else{ addThis = "She "; }
-            Console.Write("Enter a thing: ");
-            thing = Console.ReadLine();
-            Console.WriteLine(Environment.NewLine + String.Format(("{0} went for a walk in the park. " + addThis +
-                "found a {1}. {0} decided to take it home."), name, thing));
-            Console.ReadKey();
-        }
-    }
+using System.Text.RegularExpressions;
+
+namespace MadLibs_RosettaCode
+{
+	class Program
+	{
+		static void Main(string[] args)
+		{
+			string madLibs =
+@"Write a program to create a Mad Libs like story.
+The program should read an arbitrary multiline story from input.
+The story will be terminated with a blank line.
+Then, find each replacement to be made within the story,
+ask the user for a word to replace it with, and make all the replacements.
+Stop when there are none left and print the final story.
+The input should be an arbitrary story in the form:
+<name> went for a walk in the park. <he or she>
+found a <noun>. <name> decided to take it home.
+Given this example, it should then ask for a name,
+a he or she and a noun (<name> gets replaced both times with the same value).";
+
+			StringBuilder sb = new StringBuilder();
+			Regex pattern = new Regex(@"\<(.*?)\>");
+			string storyLine;
+			string replacement;
+
+			Console.WriteLine(madLibs + Environment.NewLine + Environment.NewLine);
+			Console.WriteLine("Enter a story: ");
+
+			// Continue to get input while empty line hasn't been entered.
+			do
+			{
+				storyLine = Console.ReadLine();
+				sb.Append(storyLine + Environment.NewLine);
+			} while (!string.IsNullOrEmpty(storyLine) && !string.IsNullOrWhiteSpace(storyLine));
+
+			// Retrieve only the unique regex matches from the user entered story.
+			Match nameMatch = pattern.Matches(sb.ToString()).OfType<Match>().Where(x => x.Value.Equals("<name>")).Select(x => x.Value).Distinct() as Match;
+			if(nameMatch != null)
+			{
+				do
+				{
+					Console.WriteLine("Enter value for: " + nameMatch.Value);
+					replacement = Console.ReadLine();
+				} while (string.IsNullOrEmpty(replacement) || string.IsNullOrWhiteSpace(replacement));
+				sb.Replace(nameMatch.Value, replacement);
+			}
+
+			foreach (Match match in pattern.Matches(sb.ToString()))
+			{
+				replacement = string.Empty;
+				// Guarantee we get a non-whitespace value for the replacement
+				do
+				{
+					Console.WriteLine("Enter value for: " + match.Value);
+					replacement = Console.ReadLine();
+				} while (string.IsNullOrEmpty(replacement) || string.IsNullOrWhiteSpace(replacement));
+
+				int location = sb.ToString().IndexOf(match.Value);
+				sb.Remove(location, match.Value.Length).Insert(location, replacement);
+			}
+
+			Console.WriteLine(Environment.NewLine + Environment.NewLine + "--[ Here's your story! ]--");
+			Console.WriteLine(sb.ToString());
+		}
+	}
 }