/// <summary>
/// This will parse a string containing HTML and will produce a domain tree.
/// </summary>
/// <param name="html">The HTML to be parsed</param>
/// <returns>A tree representing the elements</returns>
public HtmlNodeCollection Parse(string html)
{
HtmlNodeCollection nodes = new HtmlNodeCollection(null);
html = PreprocessScript(html, "script");
html = PreprocessScript(html, "style");
html = RemoveComments(html);
html = RemoveSGMLComments(html);
StringCollection tokens = GetTokens(html);
int index = 0;
HtmlElement element = null;
while (index < tokens.Count)
{
if ("<".Equals(tokens[index]))
{
// Read open tag
index++;
if (index >= tokens.Count)
{
break;
}
string tag_name = tokens[index];
index++;
element = new HtmlElement(tag_name);
// read the attributes and values
while (index < tokens.Count && !">".Equals(tokens[index]) && !"/>".Equals(tokens[index]))
{
string attribute_name = tokens[index];
index++;
if (index < tokens.Count && "=".Equals(tokens[index]))
{
index++;
string attribute_value;
if (index < tokens.Count)
{
attribute_value = tokens[index];
}
else
{
attribute_value = null;
}
index++;
HtmlAttribute attribute = new HtmlAttribute(attribute_name, HtmlEncoder.DecodeValue(attribute_value));
element.Attributes.Add(attribute);
}
else if (index < tokens.Count)
{
// Null-value attribute
HtmlAttribute attribute = new HtmlAttribute(attribute_name, null);
element.Attributes.Add(attribute);
}
}
nodes.Add(element);
if (index < tokens.Count && "/>".Equals(tokens[index]))
{
element.IsTerminated = true;
index++;
element = null;
}
else if (index < tokens.Count && ">".Equals(tokens[index]))
{
index++;
}
}
else if (">".Equals(tokens[index]))
{
index++;
}
else if ("</".Equals(tokens[index]))
{
// Read close tag
index++;
if (index >= tokens.Count)
{
break;
}
string tag_name = tokens[index];
index++;
int open_index = FindTagOpenNodeIndex(nodes, tag_name);
if (open_index != -1)
{
MoveNodesDown(ref nodes, open_index + 1, (HtmlElement)nodes[open_index]);
}
else
{
// Er, there is a close tag without an opening tag!!
}
// Skip to the end of this tag
while (index < tokens.Count && !">".Equals(tokens[index]))
{
index++;
}
if (index < tokens.Count && ">".Equals(tokens[index]))
{
index++;
}
element = null;
}
else
{
// Read text
string value = tokens[index];
if (mRemoveEmptyElementText)
{
value = RemoveWhitespace(value);
}
value = DecodeScript(value);
if (mRemoveEmptyElementText && value.Length == 0)
{
// We do nothing
}
else
{
if (!(element != null && element.NoEscaping))
{
value = HtmlEncoder.DecodeValue(value);
}
HtmlText node = new HtmlText(value);
nodes.Add(node);
}
index++;
}
}
return(nodes);
}
/// <summary>
/// This will parse a string containing HTML and will produce a domain tree.
/// </summary>
/// <param name="html">The HTML to be parsed</param>
/// <returns>A tree representing the elements</returns>
public HtmlNodeCollection Parse(string html)
{
HtmlNodeCollection nodes = new HtmlNodeCollection(null);
html = PreprocessScript( html ,"script" );
html = PreprocessScript( html ,"style" );
html = RemoveComments( html );
html = RemoveSGMLComments( html );
StringCollection tokens = GetTokens( html );
int index = 0;
HtmlElement element = null;
while( index < tokens.Count )
{
if( "<".Equals( tokens[index] ) )
{
// Read open tag
index++;
if( index >= tokens.Count ) break;
string tag_name = tokens[index];
index++;
element = new HtmlElement( tag_name );
// read the attributes and values
while( index < tokens.Count && ! ">".Equals( tokens[index] ) && ! "/>".Equals( tokens[index] ) )
{
string attribute_name = tokens[ index ];
index++;
if( index < tokens.Count && "=".Equals( tokens[ index ] ) )
{
index++;
string attribute_value;
if( index < tokens.Count )
{
attribute_value = tokens[ index ];
}
else
{
attribute_value = null;
}
index++;
HtmlAttribute attribute = new HtmlAttribute( attribute_name , HtmlEncoder.DecodeValue( attribute_value ) );
element.Attributes.Add( attribute );
}
else if( index < tokens.Count )
{
// Null-value attribute
HtmlAttribute attribute = new HtmlAttribute( attribute_name , null );
element.Attributes.Add( attribute );
}
}
nodes.Add( element );
if( index < tokens.Count && "/>".Equals( tokens[ index ] ) )
{
element.IsTerminated = true;
index++;
element = null;
}
else if( index < tokens.Count && ">".Equals( tokens[ index ] ) )
{
index++;
}
}
else if( ">".Equals( tokens[index] ) )
{
index++;
}
else if( "</".Equals( tokens[index] ) )
{
// Read close tag
index++;
if( index >= tokens.Count ) break;
string tag_name = tokens[index];
index++;
int open_index = FindTagOpenNodeIndex( nodes , tag_name );
if( open_index != -1 )
{
MoveNodesDown( ref nodes , open_index + 1 , (HtmlElement)nodes[open_index] );
}
else
{
// Er, there is a close tag without an opening tag!!
}
// Skip to the end of this tag
while( index < tokens.Count && ! ">".Equals( tokens[ index ] ) )
{
index++;
}
if( index < tokens.Count && ">".Equals( tokens[ index ] ) )
{
index++;
}
element = null;
}
else
{
// Read text
string value = tokens[ index ];
if( mRemoveEmptyElementText )
{
value = RemoveWhitespace( value );
}
value = DecodeScript( value );
if( mRemoveEmptyElementText && value.Length == 0 )
{
// We do nothing
}
else
{
if( ! ( element != null && element.NoEscaping ) )
{
value = HtmlEncoder.DecodeValue( value );
}
HtmlText node = new HtmlText( value );
nodes.Add( node );
}
index++;
}
}
return nodes;
}
