public static string FormatHtmlDiff(string original, string updated)
{
if (original == null || updated == null)
{
return("");
}
var diffAlg = new Garland.UI.External.diff_match_patch();
var diffs = diffAlg.diff_lineModeCustom(original, updated, DateTime.MaxValue);
diffAlg.diff_cleanupSemantic(diffs);
if (diffs.Count <= 1)
{
return(WrapHtmlDiff("Files are identical."));
}
var html = new StringBuilder();
foreach (var aDiff in diffs)
{
string text = aDiff.text
.Replace("&", "&")
.Replace("<", "<")
.Replace(">", ">")
.Replace("\r\n", "<br>");
if (string.IsNullOrEmpty(text))
{
continue;
}
switch (aDiff.operation)
{
case Operation.INSERT:
html.Append(_startMarker)
.Append("<ins>")
.Append(text)
.Append("</ins>")
.Append(_endMarker);
break;
case Operation.DELETE:
html.Append(_startMarker)
.Append("<del>")
.Append(text)
.Append("</del>")
.Append(_endMarker);
break;
case Operation.EQUAL:
html.Append(text);
break;
}
}
return(WrapHtmlDiff(CutNoncontextualLines(html.ToString())));
}
public static string FormatDiff(string original, string updated)
{
var lineDelimiter = new string[] { "\r\n" };
var sb = new StringBuilder();
var diffAlgorithm = new Garland.UI.External.diff_match_patch();
//var diffList = diffAlgorithm.diff_main(original, updated);
var diffList = diffAlgorithm.diff_lineModeCustom(original, updated, DateTime.MaxValue);
diffAlgorithm.diff_cleanupSemantic(diffList);
var diffs = diffList.ToArray();
var hunks = new List <string>();
for (var i = 0; i < diffs.Length; i++)
{
var diff = diffs[i];
if (diff.operation == External.Operation.EQUAL)
{
continue;
}
var isFirst = sb.Length == 0;
var prevDiff = diffs[i - 1];
var prevDiffLines = prevDiff.text.TrimEnd().Split(lineDelimiter, StringSplitOptions.None);
var nextDiff = diffs[i + 1];
var nextDiffLines = nextDiff.text.Split(lineDelimiter, StringSplitOptions.None);
var prefix = diff.operation == External.Operation.DELETE ? "- " : "+ ";
var textLines = diff.text.TrimEnd().Split(lineDelimiter, StringSplitOptions.None);
if (prevDiff.operation == External.Operation.EQUAL)
{
sb.AppendLine(string.Join("\r\n", prevDiffLines.Reverse().Take(3).Reverse().Select(l => " " + l)));
}
sb.AppendLine(string.Join("\r\n", textLines.Select(l => prefix + l)));
if (nextDiff.operation == External.Operation.EQUAL)
{
sb.AppendLine(string.Join("\r\n", nextDiffLines.Take(3).Select(l => " " + l)));
hunks.Add(sb.ToString());
sb.Clear();
}
}
if (sb.Length > 0)
{
hunks.Add(sb.ToString());
}
return(string.Join("========================================\r\n", hunks));
}
