/// <summary>
/// A convenience method that determines a position from a node. If the node is missing,
/// then its position will be adjusted using CheckAndAdjustPosition.
/// </summary>
protected int GetAdjustedNodePosition(CSharpSyntaxNode node)
{
Debug.Assert(IsInTree(node));
var fullSpan = this.Root.FullSpan;
var position = node.SpanStart;
if (fullSpan.IsEmpty)
{
Debug.Assert(position == fullSpan.Start);
// At end of zero-width full span. No need to call
// CheckAndAdjustPosition since that will simply
// return the original position.
return position;
}
else if (position == fullSpan.End)
{
Debug.Assert(node.Width == 0);
// For zero-width node at the end of the full span,
// check and adjust the preceding position.
return CheckAndAdjustPosition(position - 1);
}
else if (node.IsMissing || node.HasErrors || node.Width == 0 || node.IsPartOfStructuredTrivia())
{
return CheckAndAdjustPosition(position);
}
else
{
// No need to adjust position.
return position;
}
}
