/// <summary>
/// Produces a pessimistic list of spans that denote the regions of text in this tree that
/// are changed from the text of the old tree.
/// </summary>
/// <param name="oldTree">The old tree. Cannot be <c>null</c>.</param>
/// <remarks>The list is pessimistic because it may claim more or larger regions than actually changed.</remarks>
public override IList <TextSpan> GetChangedSpans(SyntaxTree oldTree)
{
if (oldTree == null)
{
throw new ArgumentNullException(nameof(oldTree));
}
return(SyntaxDiffer.GetPossiblyDifferentTextSpans(oldTree, this));
}
/// <summary>
/// Gets a list of text changes that when applied to the old tree produce this tree.
/// </summary>
/// <param name="oldTree">The old tree. Cannot be <c>null</c>.</param>
/// <remarks>The list of changes may be different than the original changes that produced this tree.</remarks>
public override IList <TextChange> GetChanges(SyntaxTree oldTree)
{
if (oldTree == null)
{
throw new ArgumentNullException("oldTree");
}
return(SyntaxDiffer.GetTextChanges(oldTree, this));
}
/// <summary>
/// Gets a list of text changes that when applied to the old tree produce this tree.
/// </summary>
/// <param name="oldTree">The old tree.</param>
/// <remarks>The list of changes may be different than the original changes that produced this tree.</remarks>
public override IList <TextChange> GetChanges(SyntaxTree oldTree)
{
return(SyntaxDiffer.GetTextChanges(oldTree, this));
}
/// <summary>
/// Produces a pessimistic list of spans that denote the regions of text in this tree that
/// are changed from the text of the old tree.
/// </summary>
/// <param name="oldTree">The old tree.</param>
/// <remarks>The list is pessimistic because it may claim more or larger regions than actually changed.</remarks>
public override IList <TextSpan> GetChangedSpans(SyntaxTree oldTree)
{
return(SyntaxDiffer.GetPossiblyDifferentTextSpans(oldTree, this));
}
private static ImmutableArray <TreeChange> ComputeDiff(SyntaxNode before, SyntaxNode after)
{
var differ = new SyntaxDiffer(before, after);
}
