public static DotGraph ToDot(Graph gr)
{
DotGraph result = new DotGraph();
foreach (var node in gr.Nodes)
{
DotNode dotNode = new DotNode();
dotNode.Attributes.Add("label", node.NodeName);
var id = ensureUniqueId(result.Nodes, node.Id);
result.Nodes.Add(id, dotNode);
}
foreach (var edge in gr.Edges)
{
var key = (edge.StartId.ToString(), edge.EndId.ToString());
if (!result.Edges.ContainsKey(key))
{
result.Edges.Add(key, new List <DotEdge>());
}
DotEdge dotEdge = new DotEdge();
result.Edges[key].Add(dotEdge);
}
return(result);
}
public DotGraph Load()
{
DotGraph gr = new DotGraph();
dotString = dotString.Trim();
if (dotString.Length < 7)
{
return(gr);
}
List <string> tokens = Tokenizer.Tokenize(dotString);
tokenIter = tokens.GetEnumerator();
string?first = nextToken();
if (string.IsNullOrWhiteSpace(first) ||
(!first.Equals("graph", casei) &&
!first.Equals("digraph", casei) &&
!first.Equals("strict", casei)))
{
return(gr);
}
if (first.Equals("strict", casei))
{
gr.IsStrict = true;
tokenIter.MoveNext();
}
gr.IsDirected = tokenIter.Current.Equals("digraph", casei);
tokenIter.MoveNext();
if (tokenIter.Current != "{")
{
tokenIter.MoveNext();
}
if (tokenIter.Current == "{")
{
string?lastToken = null;
IDictionary <string, string> attributeContext = gr.GraphAttributes;
for (string?token = nextToken(), nextTok = nextToken();
token != "}" && token != null;
token = nextTok, nextTok = nextToken())
{
if (token == "--" || token == "->")
{
if (nextTok == null || nextTok == "}")
{
break;
}
gr.Nodes.TryAdd(nextTok, new DotNode());
if (lastToken != null)
{
if (!gr.Edges.ContainsKey((lastToken, nextTok)))
{
gr.Edges.Add((lastToken, nextTok), new List <DotEdge>());
}
var edge = new DotEdge();
gr.Edges[(lastToken, nextTok)].Add(edge);