/// <summary>
/// 未知ItemCount情况下的Title模式评分公式（得分越大越好）
/// </summary>
/// <param name="Nodes">无用参数</param>
/// <param name="Pattern"></param>
/// <param name="Strategy"></param>
/// <param name="BaseItemCount">无用参数</param>
/// <returns></returns>
public double TitleScore_UnkownItemCount(IEnumerable <HtmlNode> Nodes, HtmlPattern Pattern, ListStrategy Strategy, int BaseItemCount = 0)
{
double Score = /*model.VisualScore * 100 + */ Pattern.ItemCount * 4 + Pattern.AverageTextLength * 3;
//根据class和id是否有特殊字样加权
bool IDClassNameMatched;
double IDClassScore = IDClassNameScore(Pattern.LeastCommonAncestor, TitleClassNames_Must, null, out IDClassNameMatched);
//命中Must +20%
if (IDClassNameMatched)
{
Score *= 1.2;
}
IDClassScore = IDClassNameScore(Pattern.LeastCommonAncestor, null, TitleClassNames_MustNot, out IDClassNameMatched);
//命中MustNot降一半
if (IDClassNameMatched)
{
Score /= 2;
}
return(Score);
}
/// <summary>
/// 已知ItemCount情况下的Title模式评分公式（越大越好）
/// </summary>
/// <param name="Pattern"></param>
/// <param name="Strategy"></param>
/// <param name="BaseItemCount">ItemBase的数量</param>
/// <returns></returns>
public double TitleScore_WithItemCount(IEnumerable <HtmlNode> Nodes, HtmlPattern Pattern, ListStrategy Strategy, int BaseItemCount)
{
double Score = 0;
//如果没有指定最佳ItemCount，则根据Strategy提供
bool NoItemCount = false;
if (BaseItemCount <= 0)
{
BaseItemCount = Strategy.List_BestItemCount;
NoItemCount = true;
}
//Title长度打分10-100，均长跟BestAvg差异1/3或3倍以上的，10分
double Rate = Pattern.AverageTextLength > Strategy.List_BestAvgTitleLen ? Pattern.AverageTextLength / (double)Strategy.List_BestAvgTitleLen : Strategy.List_BestAvgTitleLen / (double)Pattern.AverageTextLength;
if (Rate > 3)
{
Score = 10;
}
else if (Rate > 2)
{
//1/2-2倍到3倍之间，从70降到10
Score = 10 + 60 * (3 - Rate);
}
else //1/2-2倍以内的，100-70分
{
Score = 70 + 30 * (2 - Rate);
}
//先计算数量的可能性，在1/3-3倍之间都可以，可能性等比递减
//fix 20141216: 基本上还是越多越好（例：两个标题平均长度接近的列表，一个9条，一个50条，都在2倍多，难以分辨）
Rate = Pattern.ItemCount > BaseItemCount ? Pattern.ItemCount / (double)BaseItemCount : BaseItemCount / (double)Pattern.ItemCount;
if (!NoItemCount || Pattern.ItemCount > BaseItemCount)
{
if (Rate > 3) //3倍以上5分
{
Score *= 5;
}
else if (Rate > 2) //2-3倍，5-70分
{
Score *= (5 + 65 * (3 - Rate));
}
else //2倍以内，70-100
{
Score *= 70 + 30 * (2 - Rate);
}
}
else //没有指定ItemCount的情况，且ItemCount<最佳值，则使用以下公式
{
if (Rate > 3) //3倍以上5分
{
Score *= 3;
}
else if (Rate > 2) //2-3倍，5-70分
{
Score *= (2.5 + 30 * (3 - Rate));
}
else //2倍以内，70-100
{
Score *= 35 + 15 * (2 - Rate);
}
}
//如果已经提取了RelXPath
if (!string.IsNullOrEmpty(Pattern.RelXPath))
{
//XPath路径级别约小的越好，每多一个级别扣分
if (Pattern.RelXPathLevel < 4) //小于3个级别，比较好
{
Score *= 1 + 0.3 * (3 - Pattern.RelXPathLevel);
}
else
{
Score *= 1 - 0.2 * (Pattern.RelXPathLevel - 4);
}
//用ID和class的好于用序号的，2倍得分
if (Pattern.RelXPathUsingName)
{
Score *= 2;
}
}
//根据class和id是否有特殊字样加权
bool IDClassNameMatched;
double IDClassScore = IDClassNameScore(Pattern.LeastCommonAncestor, TitleClassNames_Must, null, out IDClassNameMatched);
//命中Must +20%
if (IDClassNameMatched)
{
Score *= 1.2;
}
IDClassScore = IDClassNameScore(Pattern.LeastCommonAncestor, null, TitleClassNames_MustNot, out IDClassNameMatched);
//命中MustNot降一半
if (IDClassNameMatched)
{
Score /= 2;
}
//对Title处理，如果处于h1下面的则加分50%
Score *= HtmlTagNameScore(string.IsNullOrEmpty(Pattern.RelXPath) ? Pattern.XPath : Pattern.RelXPath);
return(Score);
}
