/// <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; }