Add speed test for C#.

Author: Neil Fraser

.gitignore

@@ -1,5 +1,6 @@
 
 *.class
+*.exe
 *.pyc
 *.komodoproject
 

csharp/DiffMatchPatch.cs

@@ -21,7 +21,6 @@
 using System.Linq;
 using System.Text;
 using System.Text.RegularExpressions;
-using System.Web;
 
 namespace DiffMatchPatch {
  internal static class CompatibilityExtensions {
@@ -167,8 +166,7 @@ public override string ToString() {
  break;
  }
 
- text.Append(HttpUtility.UrlEncode(aDiff.text,
- new UTF8Encoding()).Replace('+', ' ')).Append("\n");
+ text.Append(Uri.EscapeDataString(aDiff.text).Replace('+', ' ')).Append("\n");
  }
 
  return diff_match_patch.unescapeForEncodeUriCompatability(
@@ -653,7 +651,7 @@ private string diff_linesToCharsMunge(string text, List<string> lineArray,
  * @param lineArray List of unique strings.
  */
  protected void diff_charsToLines(ICollection<Diff> diffs,
- List<string> lineArray) {
+ IList<string> lineArray) {
  StringBuilder text;
  foreach (Diff diff in diffs) {
  text = new StringBuilder();
@@ -1429,8 +1427,7 @@ public string diff_toDelta(List<Diff> diffs) {
  foreach (Diff aDiff in diffs) {
  switch (aDiff.operation) {
  case Operation.INSERT:
- text.Append("+").Append(HttpUtility.UrlEncode(aDiff.text,
- new UTF8Encoding()).Replace('+', ' ')).Append("\t");
+ text.Append("+").Append(Uri.EscapeDataString(aDiff.text).Replace('+', ' ')).Append("\t");
  break;
  case Operation.DELETE:
  text.Append("-").Append(aDiff.text.Length).Append("\t");
@@ -1475,7 +1472,7 @@ public List<Diff> diff_fromDelta(string text1, string delta) {
  // decode would change all "+" to " "
  param = param.Replace("+", "%2b");
 
- param = HttpUtility.UrlDecode(param, new UTF8Encoding(false, true));
+ param = Uri.UnescapeDataString(param);
  //} catch (UnsupportedEncodingException e) {
  // // Not likely on modern system.
  // throw new Error("This system does not support UTF-8.", e);
@@ -2250,7 +2247,7 @@ Regex patchHeader
  }
  line = text[textPointer].Substring(1);
  line = line.Replace("+", "%2b");
- line = HttpUtility.UrlDecode(line, new UTF8Encoding(false, true));
+ line = Uri.UnescapeDataString(line);
  if (sign == '-') {
  // Deletion.
  patch.diffs.Add(new Diff(Operation.DELETE, line));
@@ -2274,26 +2271,33 @@ Regex patchHeader
  return patches;
  }
 
+ private static Regex HEXCODE = new Regex("%[0-9A-F][0-9A-F]");
+
  /**
- * Unescape selected chars for compatability with JavaScript's encodeURI.
+ * Unescape selected chars for compatibility with JavaScript's encodeURI.
  * In speed critical applications this could be dropped since the
  * receiving application will certainly decode these fine.
  * Note that this function is case-sensitive. Thus "%3F" would not be
  * unescaped. But this is ok because it is only called with the output of
- * HttpUtility.UrlEncode which returns lowercase hex.
+ * Uri.EscapeDataString which returns lowercase hex.
  *
  * Example: "%3f" -> "?", "%24" -> "$", etc.
  *
  * @param str The string to escape.
  * @return The escaped string.
  */
  public static string unescapeForEncodeUriCompatability(string str) {
- return str.Replace("%21", "!").Replace("%7e", "~")
+ str = str.Replace("%20", " ").Replace("%21", "!").Replace("%2A", "*")
  .Replace("%27", "'").Replace("%28", "(").Replace("%29", ")")
- .Replace("%3b", ";").Replace("%2f", "/").Replace("%3f", "?")
- .Replace("%3a", ":").Replace("%40", "@").Replace("%26", "&")
- .Replace("%3d", "=").Replace("%2b", "+").Replace("%24", "$")
- .Replace("%2c", ",").Replace("%23", "#");
+ .Replace("%3B", ";").Replace("%2F", "/").Replace("%3F", "?")
+ .Replace("%3A", ":").Replace("%40", "@").Replace("%26", "&")
+ .Replace("%3D", "=").Replace("%2B", "+").Replace("%24", "$")
+ .Replace("%2C", ",").Replace("%23", "#");
+ return HEXCODE.Replace(str, new MatchEvaluator(lowerHex));
+ }
+
+ private static string lowerHex(Match m) {
+ return m.ToString().ToLower();
  }
  }
 }