docs/HtmlAgilityPack/NameValuePairList.cs

   1 // HtmlAgilityPack V1.0 - Simon Mourier <simon underscore mourier at hotmail dot com>
   2 using System;
   3 using System.Collections;
   4
   5 namespace HtmlAgilityPack
   6 {
   7     internal class NameValuePairList
   8     {
   9         #region Fields
  10
  11         internal readonly string Text;
  12         private ArrayList _allPairs;
  13         private Hashtable _pairsWithName;
  14
  15         #endregion
  16
  17         #region Constructors
  18
  19         internal NameValuePairList() :
  20             this(null)
  21         {
  22         }
  23
  24         internal NameValuePairList(string text)
  25         {
  26             Text = text;
  27             _allPairs = new ArrayList();
  28             _pairsWithName = new Hashtable();
  29
  30             Parse(text);
  31         }
  32
  33         #endregion
  34
  35         #region Internal Methods
  36
  37         internal static string GetNameValuePairsValue(string text, string name)
  38         {
  39             NameValuePairList l = new NameValuePairList(text);
  40             return l.GetNameValuePairValue(name);
  41         }
  42
  43         internal ArrayList GetNameValuePairs(string name)
  44         {
  45             if (name == null)
  46                 return _allPairs;
  47             return _pairsWithName[name] as ArrayList;
  48         }
  49
  50         internal string GetNameValuePairValue(string name)
  51         {
  52             if (name == null)
  53                 throw new ArgumentNullException();
  54             ArrayList al = GetNameValuePairs(name);
  55             if (al == null)
  56                 return null;
  57
  58             // return first item
  59             NameValuePair nvp = al[0] as NameValuePair;
  60             return nvp != null ? nvp.Value : string.Empty;
  61         }
  62
  63         #endregion
  64
  65         #region Private Methods
  66
  67         private void Parse(string text)
  68         {
  69             _allPairs.Clear();
  70             _pairsWithName.Clear();
  71             if (text == null)
  72                 return;
  73
  74             string[] p = text.Split(';');
  75             foreach (string pv in p)
  76             {
  77                 if (pv.Length == 0)
  78                     continue;
  79                 string[] onep = pv.Split(new char[] {'='}, 2);
  80                 if (onep.Length==0)
  81                     continue;
  82                 NameValuePair nvp = new NameValuePair(onep[0].Trim().ToLower());
  83
  84                 nvp.Value = onep.Length < 2 ? "" : onep[1];
  85
  86                 _allPairs.Add(nvp);
  87
  88                 // index by name
  89                 ArrayList al = _pairsWithName[nvp.Name] as ArrayList;
  90                 if (al == null)
  91                 {
  92                     al = new ArrayList();
  93                     _pairsWithName[nvp.Name] = al;
  94                 }
  95                 al.Add(nvp);
  96             }
  97         }
  98
  99         #endregion
 100     }
 101 }