HtmlAttribute.cs

using System.Collections.Generic;
using System.Text;
using System.Xml;
 
namespace Waher.Content.Html
{
    public class HtmlAttribute : HtmlNode
    {
        private LinkedList<HtmlNode> segments = null;
        private readonly string name;
        private string @value;
 
        public HtmlAttribute(HtmlDocument Document, HtmlElement Parent, int StartPosition,
            int EndPosition, string Name, string Value)
            : base(Document, Parent, StartPosition, EndPosition)
        {
            this.name = Name;
            this.@value = Value;
            this.segments = null;
        }
 
        public HtmlAttribute(HtmlDocument Document, HtmlElement Parent, int StartPosition,
            int EndPosition, string Name)
            : base(Document, Parent, StartPosition, EndPosition)
        {
            this.name = Name;
            this.@value = null;
            this.segments = null;
        }
 
        public HtmlAttribute(HtmlDocument Document, HtmlElement Parent, int StartPosition, string Name, string Value)
            : base(Document, Parent, StartPosition)
        {
            this.name = Name;
            this.@value = Value;
            this.segments = null;
        }
 
        public HtmlAttribute(HtmlDocument Document, HtmlElement Parent, int StartPosition, string Name)
            : base(Document, Parent, StartPosition)
        {
            this.name = Name;
            this.@value = null;
            this.segments = null;
        }
 
        public string Name => this.name;
 
        internal void Add(HtmlNode Segment)
        {
            if (this.segments is null)
                this.segments = new LinkedList<HtmlNode>();
 
            this.segments.AddLast(Segment);
            this.@value = null;
        }
 
        internal bool HasSegments
        {
            get { return !(this.segments is null); }
        }
 
        public string Value
        {
            get
            {
                if (this.@value is null)
                {
                    if (!(this.segments is null))
                    {
                        StringBuilder sb = new StringBuilder();
 
                        foreach (HtmlNode N in this.segments)
                            sb.Append(N.ToString());
 
                        this.@value = sb.ToString();
                    }
                    else
                        this.@value = string.Empty;
                }
 
                return this.@value;
            }
 
            internal set
            {
                this.@value = value;
                this.segments = null;
            }
        }
 
        public override string ToString()
        {
            return this.name + "=" + this.Value;
        }
 
        public override void Export(XmlWriter Output)
        {
            int i = this.name.IndexOf(':');
            if (i < 0)
                Output.WriteAttributeString(this.name, this.@value);
            else
            {
                Output.WriteAttributeString(this.name.Substring(0, i),
                    this.name.Substring(i + 1), string.Empty, this.@value);
            }
        }
 
        public override void Export(StringBuilder Output)
        {
            Output.Append(' ');
            Output.Append(this.name);
            Output.Append("=\"");
            Output.Append(Xml.XML.Encode(this.@value));
            Output.Append('"');
        }
    }
}