public static StringDiffResult Compare(string expected, string actual)
{
if (expected == null)
{
throw new ArgumentNullException(nameof(expected));
}
if (actual == null)
{
throw new ArgumentNullException(nameof(actual));
}
var length = Math.Min(expected.Length, actual.Length);
var comparison = Enumerable
.Range(0, length)
.Zip(expected, (i, c) => new { I = i, Expected = c })
.Zip(actual, (z, c) => new { z.I, AreEqual = c.Equals(z.Expected) })
.ToArray();
var areEqual = expected.Length == actual.Length && comparison.All(x => x.AreEqual);
if (areEqual)
{
return(new StringDiffResult(true));
}
var firstDifference = comparison.FirstOrDefault(x => !x.AreEqual);
var firstDifferenceIndex = firstDifference == null ? length : firstDifference.I;
return(StringDiff.CreateResult(expected, actual, firstDifferenceIndex));
}
private static StringDiffResult CreateResult(string expected, string actual, int firstDifferenceIndex)
{
var details = $"Expected:\n{StringDiff.CreateAroundIndex(expected, firstDifferenceIndex)}\nActual:\n{StringDiff.CreateAroundIndex(actual, firstDifferenceIndex)}";
return(new StringDiffResult(false, firstDifferenceIndex, details));
}
