} //图
public SymbolDiGraph(string filename, string delim, SearchTableOptions options = SearchTableOptions.SequantialST)
{
st = SearchTableExamples.CreateSearchTable <string, int?>(options);
Scanner scanner = new Scanner(new StreamReader(File.OpenRead(filename)));
while (scanner.HasNextLine()) //构造索引
{
string[] a = scanner.ReadLine().Split(delim); //为每个不同的字符串关联一个索引
for (int i = 0; i < a.Length; i++)
{
if (!st.Contains(a[i]))
{
st.Put(a[i], st.Size);
}
}
}
keys = new string[st.Size]; //用来获得顶点名反向索引
foreach (string name in st.Keys())
{
keys[st.Get(name) ?? -1] = name;
}
G = new DiGraph(st.Size);
scanner = new Scanner(new StreamReader(File.OpenRead(filename))); //第二遍
while (scanner.HasNextLine())
{
string[] a = scanner.ReadLine().Split(delim); //将每一行的第一个顶点和该行的其他顶点相连
int v = st.Get(a[0]) ?? -1;
for (int i = 1; i < a.Length; i++)
{
G.AddEdge(v, st.Get(a[i]) ?? -1);
}
}
}