/// <summary>
/// 设置关键词高亮
/// </summary>
/// <param name="content"></param>
/// <param name="keyWordSet"></param>
/// <returns></returns>
protected virtual string SetHighKeyWord(string content, ISet <string> keyWordSet)
{
if (keyWordSet == null || keyWordSet.Count <= 0)
{
return(content);
}
const string preTag = "<span class='highlight'>", endTag = "</span>";
var newContent = new StringBuilder(content.Length);
var seg = new JiebaSegmenter();
int index = 0;
var contentWords = seg.TokenizeAll(content).Where(t => keyWordSet.Contains(t.Word)).ToArray();
var resultToken = contentWords.MergeTokenList();
foreach (var token in resultToken)
{
var length = token.StartIndex - index;
if (length > 0)
{
newContent.Append(content.Substring(index, length));
}
else if (length < 0 && index < token.EndIndex)
{
token.Word = index < token.EndIndex ? content.Substring(index, token.EndIndex - index) : "";
}
newContent.Append(preTag);
newContent.Append(token.Word);
newContent.Append(endTag);
index = Math.Max(index, token.EndIndex);
}
if (index <= content.Length - 1)
{
newContent.Append(content.Substring(index));
}
return(newContent.ToString());
}
public void ResetTextReader(TextReader reader)
{
var text = reader.ReadToEnd();
_tokens = _segmenter.TokenizeAll(text).MergeTokenList(_keywords);
_position = -1;
}
public void ResetTextReader(TextReader reader)
{
var text = reader.ReadToEnd();
var buffer = segmenter.TokenizeAll(text);
tokens = buffer is IList <Token> list ? list : buffer.ToArray();
position = -1;
}
