static IEnumerable <GraphEdge> GetLayeredSuccessors(Node <ExpressionBuilder, ExpressionBuilderArgument> node, int layer, Dictionary <Node <ExpressionBuilder, ExpressionBuilderArgument>, GraphNode> layerMap)
{
foreach (var successor in node.Successors)
{
var layeredSuccessor = layerMap[successor.Target];
var currentSuccessor = layeredSuccessor;
var property = TypeDescriptor.CreateProperty(typeof(Edge <ExpressionBuilder, ExpressionBuilderArgument>), "Label", typeof(ExpressionBuilderArgument));
var context = new TypeDescriptorContext(successor, property);
for (int i = layeredSuccessor.Layer + 1; i < layer; i++)
{
var edge = new GraphEdge(context, successor.Label, currentSuccessor);
var dummyNode = new GraphNode(null, i, Enumerable.Repeat(edge, 1));
dummyNode.Tag = edge;
currentSuccessor = dummyNode;
}
yield return(new GraphEdge(context, successor.Label, currentSuccessor));
}
}
internal GraphEdge(GraphEdge edge, GraphNode successor)
{
Label = edge.Label;
Node = successor;
Text = edge.Text;
}