private IEnumerable<string> Search(SuffixTreeNode node, SearchOptions options)
{
if (options.Keyword.Length == 0)
return node.Values;
var c = options.Keyword.First();
if (options.CaseSensitive == false) {
SuffixTreeNode nextUpperNode;
SuffixTreeNode nextLowerNode;
node.Nodes.TryGetValue(char.ToLower(c), out nextLowerNode);
node.Nodes.TryGetValue (char.ToUpper (c), out nextUpperNode);
if (nextUpperNode == null && nextLowerNode == null) return Enumerable.Empty<string>();
options.Keyword = options.Keyword.Substring(1);
if (nextUpperNode != null && nextLowerNode != null)
return Search(nextLowerNode, options.Clone()).Union(Search(nextUpperNode, options.Clone()));
return Search(nextLowerNode ?? nextUpperNode, options.Clone());
} else {
SuffixTreeNode nextNode;
node.Nodes.TryGetValue(c, out nextNode);
if (nextNode == null) return Enumerable.Empty<string>();
options.Keyword = options.Keyword.Substring(1);
return Search(nextNode, options);
}
}
public void Insert(string name, string path)
{
var currentNode = RootNode;
foreach (var c in name)
{
SuffixTreeNode nextNode;
currentNode.Nodes.TryGetValue(c, out nextNode);
if (nextNode == null)
{
nextNode = new SuffixTreeNode();
currentNode.Nodes.Add(c, nextNode);
}
nextNode.Values.Add(path);
currentNode = nextNode;
}
if (name.Length >= 1)
Insert(name.Substring(1), path);
}
public SuffixTree()
{
RootNode = new SuffixTreeNode();
}
