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using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using DiffLib;
using NUnit.Framework;
namespace ICSharpCode.Decompiler.Tests.Helpers
{
public class CodeAssert
{
public static void AreEqual(string input1, string input2)
{
var diff = new StringWriter();
if (!Compare(input1, input2, diff)) {
Assert.Fail(diff.ToString());
}
}
static bool Compare(string input1, string input2, StringWriter diff)
{
var differ = new AlignedDiff<string>(
NormalizeAndSplitCode(input1),
NormalizeAndSplitCode(input2),
new CodeLineEqualityComparer(),
new StringSimilarityComparer(),
new StringAlignmentFilter());
bool result = true, ignoreChange;
int line1 = 0, line2 = 0;
foreach (var change in differ.Generate()) {
switch (change.Change) {
case ChangeType.Same:
diff.Write("{0,4} {1,4} ", ++line1, ++line2);
diff.Write(" ");
diff.WriteLine(change.Element1);
break;
case ChangeType.Added:
diff.Write(" {1,4} ", line1, ++line2);
result &= ignoreChange = ShouldIgnoreChange(change.Element2);
diff.Write(ignoreChange ? " " : " + ");
diff.WriteLine(change.Element2);
break;
case ChangeType.Deleted:
diff.Write("{0,4} ", ++line1, line2);
result &= ignoreChange = ShouldIgnoreChange(change.Element1);
diff.Write(ignoreChange ? " " : " - ");
diff.WriteLine(change.Element1);
break;
case ChangeType.Changed:
diff.Write("{0,4} ", ++line1, line2);
result = false;
diff.Write("(-) ");
diff.WriteLine(change.Element1);
diff.Write(" {1,4} ", line1, ++line2);
diff.Write("(+) ");
diff.WriteLine(change.Element2);
break;
}
}
return result;
}
class CodeLineEqualityComparer : IEqualityComparer<string>
{
private IEqualityComparer<string> baseComparer = EqualityComparer<string>.Default;
public bool Equals(string x, string y)
{
return baseComparer.Equals(
NormalizeLine(x),
NormalizeLine(y)
);
}
public int GetHashCode(string obj)
{
return baseComparer.GetHashCode(NormalizeLine(obj));
}
}
private static string NormalizeLine(string line)
{
line = line.Trim();
var index = line.IndexOf("//");
if (index >= 0) {
return line.Substring(0, index);
} else if (line.StartsWith("#")) {
return string.Empty;
} else {
return line;
}
}
private static bool ShouldIgnoreChange(string line)
{
// for the result, we should ignore blank lines and added comments
return NormalizeLine(line) == string.Empty;
}
private static IEnumerable<string> NormalizeAndSplitCode(string input)
{
return input.Split(new[] { "\r\n", "\n\r", "\n", "\r" }, StringSplitOptions.RemoveEmptyEntries);
}
}
}
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