/// <summary>
/// 搜索文本中需要过滤的字符
/// </summary>
/// <param name="text">原始文本</param>
/// <param name="wt">过滤类型</param>
/// <returns>过滤字词集合</returns>
public List<string> SearchWord(ref string text, word_type wt)
{
if (text.Trim().Length <= 0)
return null;
if (wt == word_type.delete)
{
return Search(ref text, word_type.delete);
}
else if (wt == word_type.shift)
{
return Search(ref text, word_type.shift);
}
else
{
return Search(ref text, word_type.trial);
}
}
private List<String> Search(ref string text, word_type wt)
{
List<string> result_list = new List<string>(); //过滤词列表
byte[] bytes = Encoding.GetEncoding(CharSet).GetBytes(text.Trim()); //转换过滤文本
if (null == bytes || bytes.Length == 0)
{
return null;
}
TreeNode tempNode = rootNode; //临时树等于整个关键字树
int rollback = 0; //记录匹配树节点个数
int position = 0; //过滤文本下标
int s_postion = 0; //遇到关键字时开始的树节点
while (position < bytes.Length)
{
int index = bytes[position] & 0xff;
_wordBuffer.WriteB(bytes[position]);
tempNode = tempNode.getSubNode(index); //查找节点
if (tempNode == null)
{
position = position - rollback;
rollback = 0;
tempNode = rootNode;
_wordBuffer = new ByteBuffer(1024);
s_postion = 0;
}
else if (tempNode.isKeywordEnd()) //如果达到节点末尾
{
if (rollback == 0)
s_postion = position;
_wordBuffer.Flip();
string word = Encoding.GetEncoding(CharSet).GetString(_wordBuffer.Array());
_wordBuffer.Limit(_wordBuffer.Limit());
result_list.Add(word);
tempNode = rootNode;
if (wt == word_type.shift) //转换操作
{
byte shift_word = Encoding.GetEncoding(CharSet).GetBytes(ShiftChar)[0];
s_postion = (s_postion == 1) ? 0 : s_postion;
for (; s_postion <= position; s_postion++)
{
bytes[s_postion] = shift_word;
}
}
else if (wt == word_type.delete) //删除操作
{
bytes = getbyte(bytes, s_postion, position);
if (position >= rollback)
position = position - rollback;
rollback = 0;
//position = s_postion;
continue;
}
else
{
//不作修改
}
rollback = 0; //遇到结束点 rollback 置为1
s_postion = 0;
}
else
{
if (rollback == 0)
s_postion = position;
rollback++;
}
position++;
}
text = Encoding.GetEncoding(CharSet).GetString(bytes);
return result_list;
}
