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// HtmlAgilityPack V1.0 - Simon Mourier <simon underscore mourier at hotmail dot com>
using System;
using System.Collections;
namespace HtmlAgilityPack
{
internal class NameValuePairList
{
#region Fields
internal readonly string Text;
private ArrayList _allPairs;
private Hashtable _pairsWithName;
#endregion
#region Constructors
internal NameValuePairList() :
this(null)
{
}
internal NameValuePairList(string text)
{
Text = text;
_allPairs = new ArrayList();
_pairsWithName = new Hashtable();
Parse(text);
}
#endregion
#region Internal Methods
internal static string GetNameValuePairsValue(string text, string name)
{
NameValuePairList l = new NameValuePairList(text);
return l.GetNameValuePairValue(name);
}
internal ArrayList GetNameValuePairs(string name)
{
if (name == null)
return _allPairs;
return _pairsWithName[name] as ArrayList;
}
internal string GetNameValuePairValue(string name)
{
if (name == null)
throw new ArgumentNullException();
ArrayList al = GetNameValuePairs(name);
if (al == null)
return null;
// return first item
NameValuePair nvp = al[0] as NameValuePair;
return nvp != null ? nvp.Value : string.Empty;
}
#endregion
#region Private Methods
private void Parse(string text)
{
_allPairs.Clear();
_pairsWithName.Clear();
if (text == null)
return;
string[] p = text.Split(';');
foreach (string pv in p)
{
if (pv.Length == 0)
continue;
string[] onep = pv.Split(new char[] {'='}, 2);
if (onep.Length==0)
continue;
NameValuePair nvp = new NameValuePair(onep[0].Trim().ToLower());
nvp.Value = onep.Length < 2 ? "" : onep[1];
_allPairs.Add(nvp);
// index by name
ArrayList al = _pairsWithName[nvp.Name] as ArrayList;
if (al == null)
{
al = new ArrayList();
_pairsWithName[nvp.Name] = al;
}
al.Add(nvp);
}
}
#endregion
}
}
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