void FlushExisingBuffer(int lastFlushAtIndex, HtmlLexerEvent lexerEvent)
{
//raise lexer event
if (_appendCount > 0)
{
#if DEBUG
//Console.WriteLine(lexerEvent.ToString() + " : " +
// new string(this.textSnapshot.Copy(this._firstAppendAt, (this._readIndex - this._firstAppendAt) + 1)));
#endif
RaiseStateChanged(lexerEvent, this._firstAppendAt, (this._readIndex - this._firstAppendAt) + 1);
}
this._lastFlushAt = lastFlushAtIndex;
this._appendCount = 0;
}
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;
}
}
