/// <summary>
/// Constructs a new <see cref="ElementSimilarityDiffElementAligner{T}"/>.
/// </summary>
/// <param name="similarityFunc">
/// A <see cref="ElementSimilarity{T}"/> delegate that is used to work out how similar two elements are.
/// </param>
/// <param name="modificationThreshold">
/// A threshold value used to determine if aligned elements are considered replacements or modifications. If
/// two items are more similar than the threshold specifies (similarity > threshold), then it results in
/// a <see cref="DiffOperation.Modify"/>, otherwise it results in a <see cref="DiffOperation.Replace"/>.
/// </param>
/// <exception cref="ArgumentNullException">
/// <para><paramref name="similarityFunc"/> is <c>null</c>.</para>
/// </exception>
public ElementSimilarityDiffElementAligner([NotNull] ElementSimilarity <T> similarityFunc, double modificationThreshold = 0.3333)
{
if (similarityFunc == null)
{
throw new ArgumentNullException(nameof(similarityFunc));
}
_SimilarityFunc = similarityFunc;
_ModificationThreshold = modificationThreshold;
}
public void ElementSimilarityDiffElementAlignerTestCases(string s1, string s2, string expected)
{
ElementSimilarity <char> aligner = delegate(char element1, char element2)
{
if (element1 == element2)
{
return(1.0);
}
if (char.ToUpper(element1) == char.ToUpper(element2))
{
return(0.75);
}
return(0.0);
};
var sections = Diff.CalculateSections(s1.ToCharArray(), s2.ToCharArray());
var elements = Diff.AlignElements(s1.ToCharArray(), s2.ToCharArray(), sections, new ElementSimilarityDiffElementAligner <char>(aligner));
var output = GetElementOperationsAsAString(elements);
Assert.That(output, Is.EqualTo(expected));
}
