Data commit

Task/Tokenize-a-string-with-escaping/C-sharp/tokenize-a-string-with-escaping.cs

@@ -0,0 +1,41 @@
+using System;
+using System.Text;
+using System.Collections.Generic;
+
+public class TokenizeAStringWithEscaping
+{
+    public static void Main() {
+        string testcase = "one^|uno||three^^^^|four^^^|^cuatro|";
+        foreach (var token in testcase.Tokenize(separator: '|', escape: '^')) {
+            Console.WriteLine(": " + token); //Adding a : so we can see empty lines
+        }
+    }
+}
+
+public static class Extensions
+{
+    public static IEnumerable<string> Tokenize(this string input, char separator, char escape) {
+        if (input == null) yield break;
+        var buffer = new StringBuilder();
+        bool escaping = false;
+        foreach (char c in input) {
+            if (escaping) {
+                buffer.Append(c);
+                escaping = false;
+            } else if (c == escape) {
+                escaping = true;
+            } else if (c == separator) {
+                yield return buffer.Flush();
+            } else {
+                buffer.Append(c);
+            }
+        }
+        if (buffer.Length > 0 || input[input.Length-1] == separator) yield return buffer.Flush();
+    }
+
+    public static string Flush(this StringBuilder stringBuilder) {
+        string result = stringBuilder.ToString();
+        stringBuilder.Clear();
+        return result;
+    }
+}