public static List <Comment> ScrapePostComments(HtmlNode mainNode, string inHref, IModelRepository inRepo, bool inFetchCommentsVotes = true)
{
List <Comment> listComments = new List <Comment>();
// first - check if we have multiple pages of comments
// najprije, da vidimo da li je samo jedna stranica s glasovima ili ih ima više
var itemlist = mainNode.Descendants().Where(n => n.GetAttributeValue("class", "").Equals("pager")).ToList();
int pageCount = 0;
if (itemlist.Count > 0)
{
string s = itemlist[0].LastChild.PreviousSibling.InnerHtml;
int n1 = s.IndexOf("?page=");
int n2 = s.IndexOf("\"", n1);
string num = s.Substring(n1 + 6, n2 - n1 - 6);
pageCount = Convert.ToInt32(num);
}
for (int i = 0; i <= pageCount; i++)
{
HtmlNode comments = mainNode.Descendants().SingleOrDefault(x => x.Id == "comments");
string html = comments.InnerHtml;
Console.WriteLine(html);
int startInd = 0;
while (true)
{
int ind = html.IndexOf("/user/", startInd);
if (ind != -1)
{
string str = html.Substring(ind, 20);
}
startInd = ind + 5;
if (ind == -1)
{
break;
}
}
if (comments == null) // No comments?
{
return(listComments);
}
List <HtmlNode> allComments = comments.Descendants().Where(x => x.Id.StartsWith("comment-content")).ToList();
foreach (var comment in allComments)
{
Comment newComment = new Comment();
//comment.ChildNodes[1] has "\n Skviki — Pon, 28/11/2016 - 16:16.
string strNameDate = comment.ChildNodes[1].InnerText;
int mdashPos = strNameDate.IndexOf("&mdash");
string name = strNameDate.Substring(2, mdashPos - 2);
string authorName = name.Trim();
// let's see if we can get his html nick
string authorNick = "";
string str = comment.ChildNodes[1].InnerHtml;
int usrInd = str.IndexOf("/user/");
if (usrInd != -1)
{
int usrInd2 = str.IndexOf("title=", usrInd);
authorNick = str.Substring(usrInd + 6, usrInd2 - usrInd - 8);
}
// check if user exists, add him if not
User user = inRepo.GetUserByName(authorName);
if (user == null)
{
user = new User {
Name = authorName, NameHtml = authorNick
};
inRepo.AddUser(user);
}
newComment.Author = user;
int lastCommaPos = strNameDate.LastIndexOf(',');
string date = strNameDate.Substring(lastCommaPos + 1, strNameDate.Length - lastCommaPos - 1);
var numVotes =
comment.Descendants()
.Where(n => n.GetAttributeValue("class", "").Equals("total-votes-plain"))
.ToList();
string resultString = Regex.Match(numVotes[0].InnerText, @"-?\d+").Value;
newComment.NumScrappedVotes = Int32.Parse(resultString);
newComment.DatePosted = Utility.ExtractDateTime(date.Trim());
newComment.Text = comment.ChildNodes[3].InnerText;
string commentId = comment.Id;
int dashPos = commentId.LastIndexOf('-');
if (dashPos > 0)
{
string idValue = commentId.Substring(dashPos + 1, commentId.Length - dashPos - 1);
newComment.Id = Convert.ToInt32(idValue);
}
else
{
log.Error("ERROR in getting comment ID " + inHref);
}
listComments.Add(newComment);
}
// reinicijaliziramo učitani HTML za sljedeću stranicu
if (i < pageCount)
{
string href = inHref + "?page=" + (i + 1).ToString();
HtmlWeb htmlWeb = new HtmlWeb();
HtmlDocument htmlDocument = htmlWeb.Load(href);
mainNode = htmlDocument.DocumentNode;
}
}
// and now we have to fetch list of votes for each one
if (inFetchCommentsVotes)
{
foreach (var comm in listComments)
{
comm.Votes = VotesAnalyzer.ScrapeListVotesForNode(comm.Id, comm.Author, "comment", inRepo);
}
}
//List<HtmlNode> firstLevelComments = comments.ChildNodes.Where(x => x.Id.StartsWith("comment")).ToList();
//foreach (var com1 in firstLevelComments)
//{
// if( com1.Name == "div" )
// Console.WriteLine("DIV DIV DIV ******************************************\n" + com1.InnerHtml);
//}
return(listComments);
}
public static Post AnalyzePost(string inPostUrl, IModelRepository inRepo, bool isOnFrontPage, bool inFetchCommentsVotes)
{
Post newPost = new Post();
newPost.HrefLink = inPostUrl;
newPost.IsOnFrontPage = isOnFrontPage;
StringBuilder output = new StringBuilder();
output.AppendFormat("Post - {0,-90}", inPostUrl);
ScrapingBrowser Browser = new ScrapingBrowser();
Browser.AllowAutoRedirect = true; // Browser has settings you can access in setup
Browser.AllowMetaRedirect = true;
Browser.Encoding = Encoding.UTF8;
HtmlWeb htmlWeb = new HtmlWeb();
HtmlDocument htmlDocument = htmlWeb.Load(inPostUrl);
HtmlNode mainContent = htmlDocument.DocumentNode.Descendants().SingleOrDefault(x => x.Id == "content-main");
// first, Node ID
int nodeId;
string votesLink;
if (PostAnalyzer.ScrapePostID(mainContent, out nodeId, out votesLink))
{
newPost.Id = nodeId;
newPost.VotesLink = votesLink;
}
if (inRepo.PostAlreadyExists(newPost.Id)) // check for Post ID already in the repo
{
log.WarnFormat("WARNING - Post with ID {0} already in the database", newPost.Id);
return(null);
}
output.AppendFormat(" ID - {0,5}", newPost.Id);
// title
var titleHtml = mainContent.Descendants().Single(n => n.GetAttributeValue("class", "").Equals("node")).Descendants("h1").ToList();
newPost.Title = titleHtml[0].InnerText;
// text of the post
var postText = mainContent.Descendants().First(n => n.GetAttributeValue("class", "").Equals("node"));
if (postText != null)
{
int n1 = postText.InnerText.IndexOf("dodaj komentar");
newPost.Text = postText.InnerText.Substring(n1 + 20);
}
// date posted
newPost.DatePosted = ScrapePostDate(mainContent);
output.AppendFormat(" Date - {0}", newPost.DatePosted.ToString("dd/MM/yyy hh:mm"));
// author
string author, authorHtml;
PostAnalyzer.ScrapePostAuthor(htmlDocument, out author, out authorHtml);
output.AppendFormat(" Username - {0,-18}", author);
// check if user exists, add him if not
User user = inRepo.GetUserByName(author);
if (user == null)
{
user = new User {
Name = author, NameHtml = authorHtml
};
Console.WriteLine(user.Name + " ; " + user.NameHtml);
inRepo.AddUser(user);
}
newPost.Author = user;
newPost.NumCommentsScrapped = CommentsAnalyzer.ScrapePostCommentsNum(mainContent);
if (newPost.NumCommentsScrapped < 0)
{
log.Error("ERROR - scrapping number of comments");
}
output.AppendFormat(" Num.comm - {0,3}", newPost.NumCommentsScrapped);
if (newPost.Id > 0)
{
newPost.Votes = VotesAnalyzer.ScrapeListVotesForNode(newPost.Id, newPost.Author, "node", inRepo);
}
output.AppendFormat(" Votes - {0}", newPost.Votes.Count);
log.Info(output.ToString());
newPost.Comments = CommentsAnalyzer.ScrapePostComments(mainContent, inPostUrl, inRepo, inFetchCommentsVotes);
//Console.WriteLine(" Comments - {0}", newPost.Comments.Count);
return(newPost);
}
