/// <summary>
///
/// </summary>
/// <param name="writer"></param>
/// <param name="hTMLElement"></param>
/// <param name="p"></param>
private static void PrintDomTree(StreamWriter writer, HTMLElement parent)
{
if (parent == null)
return;
foreach (HTMLElement child in parent.ChildNodes)
{
if (child.TagType != ElementType.text)
{
if (!child.HasNoStartNode)
{
if (child.CanHaveChildren)
writer.Write(child.Text.Replace("/>", ">"));
else
writer.Write(child.Text);
}
}
else
writer.Write(child.Text);
PrintDomTree(writer, child);
if (!child.HasNoStartNode)
{
if (child.CanHaveChildren)
writer.Write("</" + child.Tag + ">");
}
}
}
/// <summary>
///
/// </summary>
/// <param name="parent"></param>
/// <param name="index"></param>
private void FormCDATA(HTMLElement parent, ref int index)
{
StringBuilder elemBuilder = new StringBuilder();
elemBuilder.Append("<![CDATA[");
index = index + 9;
while (index < this.Html.Length)
{
if ((index + 2 < this.Html.Length) &&
(this.Html[index] == ']' &&
(this.Html[index + 1] == ']') &&
(this.Html[index + 2] == '>')))
{
elemBuilder.Append("]]>");
HTMLElement comment = new HTMLElement();
comment.Tag = "comment";
comment.Text = elemBuilder.ToString();
comment.TagType = ElementType.cdata;
comment.CanHaveChildren = false;
parent.ChildNodes.Add(comment);
comment.Parent = parent;
index = index + 3;
return;
}
elemBuilder.Append(this.Html[index]);
index++;
}
if (index >= this.Html.Length)
return;
}
/// <summary>
/// Create the DOM
/// </summary>
private void CreateDom()
{
if (String.IsNullOrEmpty(this.Html))
return;
int index = 0;
// Form the Header Element first
FormHeader(ref index);
this._currentNode = this.HDocument.Root;
// Form the Rest of the DOM
FormElement(ref index);
return;
}
/// <summary>
/// This method is used to parse the node which allow for child nodes.
/// NOTE: There is not significant difference in parsing here and method for nodes that cannot have child nodes.
/// This is for simplicity of understanding.
/// </summary>
/// <param name="inputElement"></param>
/// <param name="parent"></param>
/// <param name="index"></param>
private void FormWithChildNode(HTMLElement otherElement, ref int index)
{
StringBuilder elemBuilder = new StringBuilder();
elemBuilder.Append("<" + otherElement.Tag);
index = index + otherElement.Tag.Length + 1;
while (index < this.Html.Length)
{
if (index < this.Html.Length && this.Html[index] == ' ')
{ elemBuilder.Append(this.Html[index]); index++; continue; }
if (index >= this.Html.Length)
break;
//forming the attribute nodeName
StringBuilder attrBuilder = new StringBuilder();
while (index < this.Html.Length && (this.Html[index] != '=' && this.Html[index] != '>' && this.Html[index] != '<'))
{
if (this.Html[index] == '/' && (index + 1 < this.Html.Length) && this.Html[index + 1] == '>')
{ index++; continue; }
elemBuilder.Append(this.Html[index]);
attrBuilder.Append(this.Html[index]);
index++;
}
if (index >= this.Html.Length)
break;
//handle different element ending case here
if (this.Html[index] == '>' || this.Html[index] == '<')
{
if (this.Html[index] == '>')
{
index++;
if (this.Html[index - 2] != '/')
{
elemBuilder.Append("/>");
otherElement.Text = elemBuilder.ToString();
this._currentNode = otherElement;
}
}
return;
}
elemBuilder.Append(this.Html[index]);// this is for '=' case
index++; // this is for '=' case
//forming the value nodeValue
StringBuilder valueBuilder = new StringBuilder();
bool ignoreSpace = false;
bool startSpaceSkip = true;
char startChar = default(char);
while (index < this.Html.Length && ((this.Html[index] != '>' && this.Html[index] != '<') || ignoreSpace))
{
if (this.Html[index] == ' ' && startSpaceSkip)
{ index++; continue; }
startSpaceSkip = false;
if (valueBuilder.Length == 0 && (this.Html[index] == '"' || this.Html[index] == '\'') && ignoreSpace == false)
{ ignoreSpace = true; elemBuilder.Append(this.Html[index]); startChar = this.Html[index]; index++; continue; }
if (this.Html[index] == startChar && ignoreSpace == true)
{ ignoreSpace = false; elemBuilder.Append(this.Html[index]); index++; break; }
if (this.Html[index] == ' ' && ignoreSpace == false)
{ break; }
if (this.Html[index] == '/' && (index + 1 < this.Html.Length) && this.Html[index + 1] == '>')
{ index++; continue; }
elemBuilder.Append(this.Html[index]);
valueBuilder.Append(this.Html[index]);
index++;
}
//add nodeValue to element
if (valueBuilder.Length > 0)
{
otherElement.Attributes.Add(new KeyValueEx() { Key = attrBuilder.ToString().Trim(), Value = valueBuilder.ToString() });
}
if (index >= this.Html.Length)
break;
//handle different element ending case here
if (this.Html[index] == '>' || this.Html[index] == '<')
{
if (this.Html[index] == '>')
{
index++;
if (this.Html[index - 2] != '/')
{
elemBuilder.Append("/>");
otherElement.Text = elemBuilder.ToString();
this._currentNode = otherElement;
}
}
return;
}
}
if (index >= this.Html.Length)
{
otherElement.Text = elemBuilder.ToString();
return;
}
if (this.Html[index] == '>' || this.Html[index] == '<')
{
if (this.Html[index - 1] == '/')
elemBuilder.Append("/");
if (elemBuilder[elemBuilder.Length - 1] != '>')
elemBuilder.Append(">");
otherElement.Text = elemBuilder.ToString();
if (this.Html[index] == '>')
index++;
return;
}
}
/// <summary>
///
/// </summary>
/// <param name="inputElement"></param>
/// <param name="parent"></param>
/// <param name="index"></param>
private void FormScriptNode(HTMLElement inputElement, ref int index)
{
bool scriptEnded = false;
StringBuilder elemBuilder = new StringBuilder();
elemBuilder.Append("<" + inputElement.Tag);
index = index + inputElement.Tag.Length + 1;
while (index < this.Html.Length)
{
if (index < this.Html.Length && this.Html[index] == ' ')
{ elemBuilder.Append(this.Html[index]); index++; continue; }
if (index >= this.Html.Length)
break;
//elemBuilder.Append(" ");
//forming the attribute nodeName
StringBuilder attrBuilder = new StringBuilder();
while (index < this.Html.Length && (this.Html[index] != '=' && this.Html[index] != '>' && this.Html[index] != '<'))
{
if (this.Html[index] == '/' && (index + 1 < this.Html.Length) && this.Html[index + 1] == '>')
{ scriptEnded = true; index++; continue; }
elemBuilder.Append(this.Html[index]);
attrBuilder.Append(this.Html[index]);
index++;
}
if (index >= this.Html.Length)
break;
if (this.Html[index] == '>' || this.Html[index] == '<')
{
break;
}
elemBuilder.Append(this.Html[index]);// this is for '=' case
index++; // this is for '=' case
//forming the value nodeValue
StringBuilder valueBuilder = new StringBuilder();
bool ignoreSpace = false;
bool startSpaceSkip = true;
char startChar = default(char);
while (index < this.Html.Length && ((this.Html[index] != '>' && this.Html[index] != '<') || ignoreSpace))
{
if (this.Html[index] == ' ' && startSpaceSkip)
{ index++; continue; }
startSpaceSkip = false;
if (valueBuilder.Length == 0 && (this.Html[index] == '"' || this.Html[index] == '\'') && ignoreSpace == false)
{ elemBuilder.Append(this.Html[index]); ignoreSpace = true; startChar = this.Html[index]; index++; continue; }
if (this.Html[index] == startChar && ignoreSpace == true)
{ elemBuilder.Append(this.Html[index]); index++; break; }
if (this.Html[index] == ' ' && ignoreSpace == false)
{ break; }
if (this.Html[index] == '/' && (index + 1 < this.Html.Length) && this.Html[index + 1] == '>')
{ scriptEnded = true; index++; continue; }
elemBuilder.Append(this.Html[index]);
valueBuilder.Append(this.Html[index]);
index++;
}
//elemBuilder.Append(" ");
if (valueBuilder.Length > 0)
{
inputElement.Attributes.Add(new KeyValueEx() { Key = attrBuilder.ToString().Trim(), Value = valueBuilder.ToString() });
}
if (index >= this.Html.Length)
break;
if (this.Html[index] == '>' || this.Html[index] == '<')
{
break;
}
}
if (index >= this.Html.Length)
{
inputElement.Text = elemBuilder.ToString();
return;
}
if (this.Html[index] == '>' || this.Html[index] == '<')
{
elemBuilder.Append("/>");
inputElement.Text = elemBuilder.ToString();
if (this.Html[index] == '>')
index++;
}
if (scriptEnded == false)
{
HTMLElement textElement = new HTMLElement(); // The text node for current html node
textElement.Tag = "#text";
textElement.TagType = ElementType.text;
textElement.CanHaveChildren = false;
textElement.Parent = _currentNode;
inputElement.ChildNodes.Add(textElement);
StringBuilder scriptText = new StringBuilder();
bool insideString = false;
char startChar = default(char);
while (index < this.Html.Length)
{
if (!insideString && (this.Html[index] == '\'' || this.Html[index] == '"'))
{ insideString = true; startChar = this.Html[index]; }
if (insideString && this.Html[index] == startChar)
{ insideString = false; startChar = default(char); }
if (!insideString)
{
if (index < this.Html.Length && this.Html[index] == '<' &&
index + 1 < this.Html.Length && (this.Html[index + 1] == '/') &&
index + 2 < this.Html.Length && (this.Html[index + 2] == 's' || this.Html[index + 2] == 'S') &&
index + 3 < this.Html.Length && (this.Html[index + 3] == 'c' || this.Html[index + 3] == 'C') &&
index + 4 < this.Html.Length && (this.Html[index + 4] == 'r' || this.Html[index + 4] == 'R') &&
index + 5 < this.Html.Length && (this.Html[index + 5] == 'i' || this.Html[index + 5] == 'I') &&
index + 6 < this.Html.Length && (this.Html[index + 6] == 'p' || this.Html[index + 6] == 'T') &&
index + 7 < this.Html.Length && (this.Html[index + 7] == 't' || this.Html[index + 7] == '>') &&
index + 8 < this.Html.Length && (this.Html[index + 8] == '>')
)
{
scriptEnded = true;
index = index + 9;
break;
}
}
//if (index < this.Html.Length && this.Html[index] == '<')
// break;
scriptText.Append(this.Html[index]);
index++;
}
textElement.Text = scriptText.ToString();
}
return;
}
/// <summary>
///
/// </summary>
/// <param name="inputElement"></param>
/// <param name="parent"></param>
/// <param name="index"></param>
private void FormNoChildNode(HTMLElement inputElement, ref int index)
{
StringBuilder elemBuilder = new StringBuilder();
elemBuilder.Append("<" + inputElement.Tag);
index = index + inputElement.Tag.Length + 1;
while (index < this.Html.Length)
{
if (index < this.Html.Length && this.Html[index] == ' ')
{ elemBuilder.Append(this.Html[index]); index++; continue; }
if (index >= this.Html.Length)
break;
//forming the attribute nodeName
StringBuilder attrBuilder = new StringBuilder();
while (index < this.Html.Length && (this.Html[index] != '=' && this.Html[index] != '>' && this.Html[index] != '<'))
{
if (this.Html[index] == '/' && (index + 1 < this.Html.Length) && this.Html[index + 1] == '>')
{ index++; continue; }
elemBuilder.Append(this.Html[index]);
attrBuilder.Append(this.Html[index]);
index++;
}
if (index >= this.Html.Length)
break;
if (this.Html[index] == '>' || this.Html[index] == '<')
{
break;
}
elemBuilder.Append(this.Html[index]);// this is for '=' case
index++; // this is for '=' case
//forming the value nodeValue
StringBuilder valueBuilder = new StringBuilder();
bool ignoreSpace = false;
bool startSpaceSkip = true;
char startChar = default(char);
while (index < this.Html.Length && ((this.Html[index] != '>' && this.Html[index] != '<') || ignoreSpace))
{
if (this.Html[index] == ' ' && startSpaceSkip)
{ index++; continue; }
startSpaceSkip = false;
if (valueBuilder.Length == 0 && (this.Html[index] == '"' || this.Html[index] == '\'') && ignoreSpace == false)
{ elemBuilder.Append(this.Html[index]); ignoreSpace = true; startChar = this.Html[index]; index++; continue; }
if (this.Html[index] == startChar && ignoreSpace == true)
{ elemBuilder.Append(this.Html[index]); index++; break; }
if (this.Html[index] == ' ' && ignoreSpace == false)
{ break; }
if (this.Html[index] == '/' && (index + 1 < this.Html.Length) && this.Html[index + 1] == '>')
{ index++; continue; }
elemBuilder.Append(this.Html[index]);
valueBuilder.Append(this.Html[index]);
index++;
}
if (valueBuilder.Length > 0)
{
//inputElement.Attributes[attrBuilder.ToString().Trim()] = valueBuilder.ToString();
inputElement.Attributes.Add(new KeyValueEx() { Key = attrBuilder.ToString().Trim(), Value = valueBuilder.ToString() });
}
if (index >= this.Html.Length)
break;
if (this.Html[index] == '>' || this.Html[index] == '<')
{
break;
}
}
if (index >= this.Html.Length)
{
inputElement.Text = elemBuilder.ToString();
return;
}
if (this.Html[index] == '>' || this.Html[index] == '<')
{
elemBuilder.Append("/>");
inputElement.Text = elemBuilder.ToString();
if (this.Html[index] == '>')
index++;
return;
}
}
/// <summary>
///
/// </summary>
/// <param name="parent"></param>
/// <param name="index"></param>
private void FormElement(ref int index)
{
while (index < this.Html.Length)
{
// start keeps track of the starting index value
// this is important because if at end this loop occurence
// if the new index value is same as start value then we found
// a node that is not valid html node
int start = index;
#region Form the #Text Node
//Skip till we are start of element node & form the text node
StringBuilder textElementBuilder = new StringBuilder();
while (index < this.Html.Length && this.Html[index] != '<')
{
textElementBuilder.Append(this.Html[index]);
index++;
}
if (textElementBuilder.Length > 0)
{
HTMLElement textElement = new HTMLElement(); // The text node for current html node
textElement.Tag = "#text";
textElement.TagType = ElementType.text;
textElement.CanHaveChildren = false;
textElement.Parent = _currentNode;
textElement.Text = textElementBuilder.ToString();
_currentNode.ChildNodes.Add(textElement);
}
#endregion
// Check if we reached the end of Htnl String
if (index >= this.Html.Length)
return;
// NOTE this.Html[index] HERE SHOULD ALWAYS POINT TO START OF THE NODE '<'
// OR END OF this.Html STRING
#region Form CDATA or Comment Node
//Processing Comment Node || CDATA node
if ((index + 1 < this.Html.Length) && this.Html[index + 1] == '!')
{
//Processing Comment Node
if (((index + 2 < this.Html.Length) && this.Html[index + 2] == '-') &&
((index + 3 < this.Html.Length) && this.Html[index + 3] == '-'))
{
FormComment(_currentNode, ref index);
continue;
}
//Processing CDATA Node <![CDATA[
if (((index + 2 < this.Html.Length) && this.Html[index + 2] == '[') &&
((index + 3 < this.Html.Length) && this.Html[index + 3] == 'C') &&
((index + 4 < this.Html.Length) && this.Html[index + 4] == 'D') &&
((index + 5 < this.Html.Length) && this.Html[index + 5] == 'A') &&
((index + 6 < this.Html.Length) && this.Html[index + 6] == 'T') &&
((index + 7 < this.Html.Length) && this.Html[index + 7] == 'A') &&
((index + 8 < this.Html.Length) && this.Html[index + 8] == '[')
)
{
FormCDATA(_currentNode, ref index);
continue;
}
}
#endregion
#region Form Other Html Nodes
//Skip for all spaces between '<' and 1st tag alphabet e.g. "< br/>
int tmpIndex = index + 1;
StringBuilder tag = new StringBuilder();
while (tmpIndex < this.Html.Length && this.Html[tmpIndex] == ' ')
{ tmpIndex++; }
//Check if this node is Closing Node e.g. </table>
// Or else form the tag e.g <table border=1 > : here tag is 'table'
Boolean isClosingNode = false;
while (tmpIndex < this.Html.Length && this.Html[tmpIndex] != ' ' && this.Html[tmpIndex] != '<' && this.Html[tmpIndex] != '>')
{
if (this.Html[tmpIndex] == '/')
{
if (tag.Length == 0)
{
isClosingNode = true;
tmpIndex++;
continue;
}
else
break;
}
if (this.Html[tmpIndex] != ' ')
tag.Append(this.Html[tmpIndex]);
tmpIndex++;
}
while (isClosingNode && tmpIndex < this.Html.Length && this.Html[tmpIndex] != '<' && this.Html[tmpIndex] != '>')
tmpIndex++;
if (isClosingNode && tmpIndex < this.Html.Length && this.Html[tmpIndex] == '>')
tmpIndex++;
// we found a tag here?
if (tag.Length > 0)
{
String tagfix = tag.ToString().ToLower();
if (isClosingNode && _currentNode.CanHaveChildren)
{
if (_currentNode.Tag == tagfix)
{
// This is the closing tag for current node, so we are done with this node. time to return
// if this is closing tag and belong to some other node (malformed html) we simply ignore it.
this._currentNode = _currentNode.Parent;
}
else
{
//Add an Orphan Node Or Node with No Start Node
HTMLElement orphanElement = new HTMLElement();
orphanElement.Tag = tagfix;
orphanElement.Text = this.Html.Substring(index, tmpIndex - index);
orphanElement.TagType = ElementType.none;
orphanElement.CanHaveChildren = false;
orphanElement.HasNoStartNode = true;
orphanElement.Parent = _currentNode;
_currentNode.ChildNodes.Add(orphanElement);
}
index = tmpIndex;
}
else
{
// We handle Nodes with no child allowed in FormNoChildNode method
if (tagfix == "param" || tagfix == "basefont" || tagfix == "base" || tagfix == "col" || tagfix == "link" || tagfix == "area" || tagfix == "img" || tagfix == "frame" || tagfix == "input" || tagfix == "hr" || tagfix == "br" || /*tagfix == "button" ||*/ tagfix == "meta")
{
HTMLElement inputElement = new HTMLElement();
inputElement.Tag = tagfix;
inputElement.TagType = ElementType.none;
inputElement.CanHaveChildren = false;
inputElement.Parent = _currentNode;
_currentNode.ChildNodes.Add(inputElement);
FormNoChildNode(inputElement, ref index);
}
else
{
// We handle Script node in FormScriptNode method
if (tagfix == "script")
{
HTMLElement scriptElement = new HTMLElement();
scriptElement.Tag = tagfix;
scriptElement.TagType = ElementType.none;
scriptElement.CanHaveChildren = true;
scriptElement.Parent = _currentNode;
_currentNode.ChildNodes.Add(scriptElement);
FormScriptNode(scriptElement, ref index);
}
else
{
//All other nodes are handled here
HTMLElement otherElement = new HTMLElement();
otherElement.Tag = tagfix;
otherElement.TagType = ElementType.none;
otherElement.CanHaveChildren = true;
otherElement.Parent = _currentNode;
_currentNode.ChildNodes.Add(otherElement);
FormWithChildNode(otherElement, ref index);
}
}
}
}
#endregion
if (start == index)
index++;
}
return;
}
