void BuildTree()
{
_Root = new SearchTree();
#region -Get Transions-
foreach (ReplaceKeyValue rkv in _KeyValues)
{
SearchTree st = _Root;
foreach (char c in rkv.Key)
{
SearchTree stNew = null;
foreach (SearchTree s in st.Transitions)
{
if (s.Char == c)
{
stNew = s; break;
}
}
if (stNew == null)
{
stNew = new SearchTree(st, c);
st.AddTransition(stNew);
}
st = stNew;
}
st.AddResult(rkv);
}
#endregion
#region -Find Failures-
ArrayList nodes = new ArrayList();
foreach (SearchTree st in _Root.Transitions)
{
st.Failure = _Root;
foreach (SearchTree trans in st.Transitions)
{
nodes.Add(trans);
}
}
// 广度搜索算法(BFS)
while (nodes.Count != 0)
{
ArrayList newNodes = new ArrayList();
foreach (SearchTree st in nodes)
{
SearchTree f = st.Parent.Failure;
char c = st.Char;
while (f != null && !f.Contains(c))
{
f = f.Failure;
}
if (f == null)
{
st.Failure = _Root;
}
else
{
st.Failure = f.GetTransition(c);
foreach (ReplaceKeyValue result in st.Failure.Results)
{
st.AddResult(result);
}
}
foreach (SearchTree child in st.Transitions)
{
newNodes.Add(child);
}
}
nodes = newNodes;
}
#endregion
_Root.Failure = _Root;
}
