ClrPlus.Scripting.MsBuild.Packaging.PivotsExpression.OrExpression.ToPivotsExpression C# (CSharp) Метод

            internal override PivotsExpression ToPivotsExpression(Dictionary<string, Pivots.Pivot> pivotVsPivotValues, GetChoiceDelegate get_choice_fn)
            {
                PivotsExpression left, right;

                left = left_child.ToPivotsExpression(pivotVsPivotValues, get_choice_fn);
                if (left.invariant) {
                    if (left.invariant_result)
                        return left;
                    else
                        return right_child.ToPivotsExpression(pivotVsPivotValues, get_choice_fn);
                }
                right = right_child.ToPivotsExpression(pivotVsPivotValues, get_choice_fn);
                if (right.invariant) {
                    if (right.invariant_result)
                        return right;
                    else
                        return left;
                }

                HashSet<string> pivots;
                ComparableHashSet<ComparableHashSet<string>> result;

                pivots = new HashSet<string>(left.relevant_pivots);
                pivots.UnionWith(right.relevant_pivots);

                result = GetExpandedChoices(left, pivots, pivotVsPivotValues);
                result.UnionWith(GetExpandedChoices(right, pivots, pivotVsPivotValues));

                PivotsExpression res = new PivotsExpression();
                res.relevant_pivots = pivots;
                res.matching_combinations = result;
                return res.Simplify(pivotVsPivotValues);
            }