/// <summary>
/// This will add an element to the collection.
/// </summary>
/// <param name="attribute">The attribute to add.</param>
/// <returns>The index at which it was added.</returns>
public int Add(HtmlAttribute attribute)
{
return base.List.Add( attribute );
}
/// <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;
}
// return all name, value pairs in a form
public static Dictionary<string, string> FindForm(HtmlNodeCollection nodes, string name, out Dictionary<string, string> submits, out string action)
{
HtmlElement form = FindOne(nodes, "form", "name", name);
if (form == null)
{
// try by class
form = FindOne(nodes, "form", "class", name);
if (form == null) {
submits = null;
action = null;
return null; // failed!
}
}
action = form.Attributes["action"].Value;
List<HtmlElement> inputs = FindAll(form.Nodes, "input", null, null);
// fill out dictionary
Dictionary<string, string> values = new Dictionary<string, string>();
submits = new Dictionary<string, string>();
foreach (HtmlElement input in inputs)
{
HtmlAttribute attrname = input.Attributes.FindByName("name");
if (attrname == null)
continue;
HtmlAttribute attrvalue = input.Attributes.FindByName("value");
if (attrvalue == null)
attrvalue = new HtmlAttribute("value", "");
string attrtype = input.Attributes.FindByName("type").Value.ToLower();
if (attrtype == "submit" || attrtype == "button" || attrtype == "image")
submits[attrname.Value] = attrvalue.Value;
else
values[attrname.Value] = attrvalue.Value;
}
return values;
}
