private static IDictionary <string, XPathInfo> GenerateXPaths(HtmlNode htmlNode, string xpath, IDictionary <string, XPathInfo> xpathInfos)
{
if (htmlNode.NodeType == HtmlNodeType.Element)
{
xpath += "/" + htmlNode.Name;
if (_allowedTagNames.Contains(htmlNode.Name) && !xpathInfos.ContainsKey(xpath))
{
string innerText = UserDefinedFunctions.ExtractText(htmlNode.InnerHtml).Value;
if (!string.IsNullOrEmpty(innerText.Trim()))
{
XPathInfo xPathInfo = new XPathInfo();
xPathInfo.InnerText = innerText;
xPathInfo.Tag = htmlNode.Name;
xPathInfo.XPath = xpath;
xpathInfos.Add(xpath, xPathInfo);
}
}
if (xpathInfos.ContainsKey(xpath))
{
xpathInfos[xpath].Count++;
}
Debug.Print(xpath);
}
foreach (HtmlNode childNode in htmlNode.ChildNodes)
{
if (childNode.NodeType == HtmlNodeType.Element)
{
GenerateXPaths(childNode, xpath, xpathInfos);
}
}
return(xpathInfos);
}
/// <summary>
/// Performs the action.
/// </summary>
/// <param name = "crawlRequest">The crawl request.</param>
/// <param name = "arachnodeDAO">The arachnode DAO.</param>
public override void PerformAction(CrawlRequest <TArachnodeDAO> crawlRequest, IArachnodeDAO arachnodeDAO)
{
//use this instead: http://code.google.com/p/boilerpipe/
/*if (!crawlRequest.ProcessData)
* {
* return;
* }*/
if (crawlRequest.DataType.DiscoveryType == DiscoveryType.WebPage)
{
if (crawlRequest.Data != null)
{
ManagedWebPage managedWebPage = ((ManagedWebPage)crawlRequest.ManagedDiscovery);
if (managedWebPage.HtmlDocument == null)
{
managedWebPage.HtmlDocument = crawlRequest.Crawl.Crawler.HtmlManager.CreateHtmlDocument(crawlRequest.Html, Encoding.Unicode);
}
IDictionary <string, XPathInfo> xPathInfos = new Dictionary <string, XPathInfo>();
xPathInfos = GenerateXPaths(managedWebPage.HtmlDocument.DocumentNode, string.Empty, xPathInfos);
//string dateXPath = ExtractDateXPath(htmlDocument1, xpathInfos);
//List<string> dates = htmlDocument1.DocumentNode.SelectNodes(dateXPath).OfType<HtmlNode>().Select(h => h.InnerText).ToList();
ProcessXPaths(xPathInfos);
List <XPathInfo> xPathInfos2 = xPathInfos.Values.OrderByDescending(x => x.LevenstheinDistance).ToList();
int numberOfSlashes = 0;
IDictionary <string, XPathInfo> xPathInfos3 = new Dictionary <string, XPathInfo>();
int xPaths = 0;
int minimumNumberOfXPaths = 5;
foreach (XPathInfo xPathInfo in xPathInfos2)
{
int numberOfSlashes2 = xPathInfo.XPath.Length - xPathInfo.XPath.Replace("/", string.Empty).Length;
if (numberOfSlashes2 > numberOfSlashes)
{
numberOfSlashes = numberOfSlashes2;
xPathInfos3.Add(xPathInfo.XPath, xPathInfo);
}
else
{
if (xPaths++ > minimumNumberOfXPaths)
{
break;
}
}
}
StringBuilder stringBuilder = new StringBuilder();
Dictionary <string, XPathInfo> dictionary = new Dictionary <string, XPathInfo>();
foreach (XPathInfo xPathInfo in xPathInfos3.Values)
{
//stringBuilder.Remove(0, stringBuilder.Length);
foreach (HtmlNode htmlNode in managedWebPage.HtmlDocument.DocumentNode.SelectNodes(xPathInfo.XPath))
{
string text = UserDefinedFunctions.ExtractText(htmlNode.InnerHtml).Value;
if (!dictionary.ContainsKey(text))
{
XPathInfo xPathInfo2 = new XPathInfo();
xPathInfo2.XPath = xPathInfo.XPath;
dictionary.Add(text, xPathInfo2);
}
dictionary[text].Count++;
}
}
Dictionary <string, XPathInfo> dictionary2 = new Dictionary <string, XPathInfo>();
foreach (KeyValuePair <string, XPathInfo> keyValuePair in dictionary)
{
if (!string.IsNullOrEmpty(keyValuePair.Key.Trim()))
{
dictionary2.Add(keyValuePair.Key, keyValuePair.Value);
}
}
foreach (string key in dictionary.Keys)
{
foreach (string key2 in dictionary.Keys)
{
if (!string.IsNullOrEmpty(key.Trim()) && !string.IsNullOrEmpty(key2.Trim()))
{
if (key.Contains(key2) || key2.Contains(key))
{
dictionary2[key].Count++;
dictionary2[key2].Count++;
}
}
}
}
int dictionary2Max = dictionary2.Max(d => d.Value.Count);
foreach (KeyValuePair <string, XPathInfo> keyValuePair in dictionary2)
{
if (keyValuePair.Value.Count == dictionary2Max)
{
foreach (HtmlNode htmlNode in managedWebPage.HtmlDocument.DocumentNode.SelectNodes(keyValuePair.Value.XPath))
{
stringBuilder.Append(UserDefinedFunctions.ExtractText(htmlNode.InnerHtml).Value);
}
}
}
MessageBox.Show(stringBuilder.ToString());
//return stringBuilder.ToString();
}
}
}
