public override void Parse(TextSource textSnapshot, WebDocument htmldoc, DomElement currentNode)
{
this._resultHtmlDoc = htmldoc;
char[] copyBuffer = textSnapshot.ActualSnapshot.Copy(0, textSnapshot.ActualSnapshot.Length);
using (var ms = new System.IO.MemoryStream(System.Text.Encoding.UTF8.GetBytes(copyBuffer)))
using (var textReader = new System.IO.StreamReader(ms))
{
var tokenizer = new HtmlTokenizer(textReader);
HtmlToken token;
while (tokenizer.ReadNextToken(out token))
{
switch (token.Kind)
{
case HtmlTokenKind.Data:
{
var text = (HtmlDataToken)token;
currentNode.AddChild(_resultHtmlDoc.CreateTextNode(text.Data.ToCharArray()));
}
break;
case HtmlTokenKind.Tag:
{
var tag = (HtmlTagToken)token;
if (!tag.IsEndTag)
{
//open tag
DomElement elem = this._resultHtmlDoc.CreateElement(null, tag.Name);
currentNode.AddChild(elem);
foreach (var attribute in tag.Attributes)
{
var attr = this._resultHtmlDoc.CreateAttribute(null, attribute.Name);
if (attribute.Value != null)
{
attr.Value = attribute.Value;
}
elem.AddAttribute(attr);
}
if (!tag.IsEmptyElement)
{
openEltStack.Push(currentNode);
currentNode = elem;
}
}
else
{
//this is end tag
//check end tag match or not
int tagNameIndex = _resultHtmlDoc.AddStringIfNotExists(tag.Name);
if (currentNode.Name == tag.Name)
{
currentNode = openEltStack.Pop();
}
else
{
//if not equal then check if current node need close tag or not
int count = 3; //?
bool ok = false;
while (count > 0)
{
if (HtmlTagMatching.IsSingleTag(currentNode.LocalNameIndex))
{
if (openEltStack.Count > 0)
{
currentNode = openEltStack.Pop();
}
if (currentNode.LocalName == tag.Name)
{
if (openEltStack.Count > 0)
{
currentNode = openEltStack.Pop();
ok = true;
break;
}
}
}
else if (HtmlTagMatching.CanAutoClose(currentNode.LocalNameIndex))
{
if (openEltStack.Count > 0)
{
currentNode = openEltStack.Pop();
}
if (currentNode.LocalName == tag.Name)
{
if (openEltStack.Count > 0)
{
currentNode = openEltStack.Pop();
ok = true;
break;
}
}
}
else
{
//implement err handling here!
throw new NotSupportedException();
}
count--;
}
if (!ok)
{
throw new NotSupportedException();
}
}
}
}
break;
case HtmlTokenKind.Comment:
break;
case HtmlTokenKind.DocType:
break;
default:
{
}
break;
}
}
}
}
void LexStateChanged(HtmlLexerEvent lexEvent, int startIndex, int len)
{
switch (lexEvent)
{
case HtmlLexerEvent.CommentContent:
{
//var commentContent = this.textSnapshot.Copy(startIndex, len);
}
break;
case HtmlLexerEvent.FromContentPart:
{
if (curTextNode == null)
{
curTextNode = _resultHtmlDoc.CreateTextNode(
HtmlDecodeHelper.DecodeHtml(this.textSnapshot, startIndex, len));
if (curHtmlNode != null)
{
curHtmlNode.AddChild(curTextNode);
}
}
else
{
curTextNode.AppendTextContent(HtmlDecodeHelper.DecodeHtml(this.textSnapshot, startIndex, len));
}
}
break;
case HtmlLexerEvent.AttributeValueAsLiteralString:
{
//assign value and add to parent
if (parseState == 11)
{
//document node
//doc
domDocNode.AddParameter(textSnapshot.Substring(startIndex, len));
}
else
{
curAttr.Value = textSnapshot.Substring(startIndex, len);
curHtmlNode.AddAttribute(curAttr);
}
}
break;
case HtmlLexerEvent.Attribute:
{
//create attribute node and wait for its value
string nodename = textSnapshot.Substring(startIndex, len);
curAttr = this._resultHtmlDoc.CreateAttribute(null, nodename);
}
break;
case HtmlLexerEvent.NodeNameOrAttribute:
{
//the lexer dose not store state of element name or attribute name
//so we use parseState to decide here
string name = textSnapshot.Substring(startIndex, len);
switch (parseState)
{
case 0:
{
//create element
DomElement elem = this._resultHtmlDoc.CreateElement(null, name);
if (curHtmlNode != null)
{
curHtmlNode.AddChild(elem);
openEltStack.Push(curHtmlNode);
}
curHtmlNode = elem;
parseState = 1; //attribute
curTextNode = null;
curAttr = null;
waitingAttrName = null;
}
break;
case 1:
{
//wait for attr value
if (waitingAttrName != null)
{
//push waiting attr
curAttr = this._resultHtmlDoc.CreateAttribute(null, waitingAttrName);
curAttr.Value = "";
curHtmlNode.AddAttribute(curAttr);
curAttr = null;
}
waitingAttrName = name;
}
break;
case 2:
{
//****
//node name after open slash
//TODO: review here,avoid direct string comparison
if (curHtmlNode.LocalName == name)
{
if (openEltStack.Count > 0)
{
waitingAttrName = null;
curTextNode = null;
curAttr = null;
curHtmlNode = openEltStack.Pop();
}
parseState = 3;
}
else
{
//if not equal then check if current node need close tag or not
if (HtmlTagMatching.IsSingleTag(curHtmlNode.LocalNameIndex))
{
if (openEltStack.Count > 0)
{
waitingAttrName = null;
curHtmlNode = openEltStack.Pop();
curAttr = null;
curTextNode = null;
}
if (curHtmlNode.LocalName == name)
{
if (openEltStack.Count > 0)
{
curTextNode = null;
curAttr = null;
curHtmlNode = openEltStack.Pop();
waitingAttrName = null;
}
parseState = 3;
}
else
{
//implement err handling here!
throw new NotSupportedException();
}
}
else
{
//implement err handling here!
throw new NotSupportedException();
}
}
}
break;
case 4:
{
//attribute value as id
if (curAttr != null)
{
curAttr.Value = name;
curAttr = null;
parseState = 0;
waitingAttrName = null;
}
else
{
}
}
break;
case 10:
{
//document node
parseState = 11;
//after docnodename , this may be attr of the document node
this.domDocNode = (DomDocumentNode)this._resultHtmlDoc.CreateDocumentNodeElement();
domDocNode.DocNodeName = name;
}
break;
case 11:
{
//doc
domDocNode.AddParameter(name);
}
break;
default:
{
}
break;
}
}
break;
case HtmlLexerEvent.VisitCloseAngle:
{
//close angle of current new node
//enter into its content
if (parseState == 11)
{
//add doctype to html
this._resultHtmlDoc.RootNode.AddChild(this.domDocNode);
domDocNode = null;
}
if (waitingAttrName != null)
{
curAttr = this._resultHtmlDoc.CreateAttribute(null, waitingAttrName);
curAttr.Value = "";
curHtmlNode.AddAttribute(curAttr);
curAttr = null;
}
waitingAttrName = null;
parseState = 0;
curTextNode = null;
curAttr = null;
}
break;
case HtmlLexerEvent.VisitAttrAssign:
{
parseState = 4;
}
break;
case HtmlLexerEvent.VisitOpenSlashAngle:
{
parseState = 2;
}
break;
case HtmlLexerEvent.VisitCloseSlashAngle:
{
if (openEltStack.Count > 0)
{
curTextNode = null;
curAttr = null;
waitingAttrName = null;
curHtmlNode = openEltStack.Pop();
}
parseState = 0;
}
break;
case HtmlLexerEvent.VisitOpenAngleExclimation:
{
//eg. doctype
parseState = 10;
}
break;
default:
{
//1. visit open angle
}
break;
}
}
