mcs/class/System.Web.Services/System.Web.Services.Protocols/PatternMatcher.cs

   1 // \r
   2 // System.Web.Services.Protocols.PatternMatcher.cs\r
   3 //\r
   4 // Author:\r
   5 //   Tim Coleman (tim@timcoleman.com)\r
   6 //\r
   7 // Copyright (C) Tim Coleman, 2002\r
   8 //\r
   9 \r
  10 using System.Web.Services;\r
  11 using System.Reflection;\r
  12 using System.Text.RegularExpressions;\r
  13 using System.Collections;\r
  14 \r
  15 namespace System.Web.Services.Protocols \r
  16 {\r
  17         public sealed class PatternMatcher \r
  18         {\r
  19                 Type _returnType;\r
  20                 MatchInfo[] _matchInfos;\r
  21                 \r
  22                 public PatternMatcher (Type type) \r
  23                 {\r
  24                         _returnType = type;\r
  25                         \r
  26                         FieldInfo[] fields = type.GetFields ();\r
  27                         ArrayList matchInfos = new ArrayList ();\r
  28                         \r
  29                         foreach (FieldInfo field in fields)\r
  30                         {\r
  31                                 object[] ats = field.GetCustomAttributes (typeof(MatchAttribute), true);\r
  32                                 if (ats.Length == 0) continue;\r
  33                                 \r
  34                                 MatchInfo mi = new MatchInfo ();\r
  35                                 mi.Field = field;\r
  36                                 mi.Match = (MatchAttribute) ats[0];\r
  37                                 \r
  38                                 RegexOptions opts = RegexOptions.Multiline;\r
  39                                 if (mi.Match.IgnoreCase) opts |= RegexOptions.IgnoreCase;\r
  40                                 mi.Regex = new Regex (mi.Match.Pattern, opts);\r
  41                                 \r
  42                                 matchInfos.Add (mi);\r
  43                         }\r
  44                         _matchInfos = (MatchInfo[]) matchInfos.ToArray (typeof(MatchInfo));\r
  45                 }\r
  46                 \r
  47                 public object Match (string text)\r
  48                 {\r
  49                         object ob = Activator.CreateInstance (_returnType);\r
  50                         \r
  51                         foreach (MatchInfo mi in _matchInfos)\r
  52                         {\r
  53                                 MatchCollection matches = mi.Regex.Matches (text);\r
  54                                 \r
  55                                 object res = null;\r
  56                                 \r
  57                                 if (mi.Field.FieldType.IsArray)\r
  58                                 {\r
  59                                         int max = mi.Match.MaxRepeats;\r
  60                                         if (max == -1) max = matches.Count;\r
  61                                         \r
  62                                         Type elemType = mi.Field.FieldType.GetElementType();\r
  63                                         Array array = Array.CreateInstance (elemType, max);\r
  64                                         for (int n=0; n<max; n++)\r
  65                                                 array.SetValue (mi.GetMatchValue (matches[n], elemType), n);\r
  66                                         res = array;\r
  67                                 }\r
  68                                 else if (matches.Count > 0)\r
  69                                         res = mi.GetMatchValue (matches[0], mi.Field.FieldType);\r
  70                                         \r
  71                                 mi.Field.SetValue (ob, res);\r
  72                         }\r
  73                         return ob;\r
  74                 }\r
  75 \r
  76         }\r
  77 \r
  78         class MatchInfo\r
  79         {\r
  80                 public FieldInfo Field;\r
  81                 public MatchAttribute Match;\r
  82                 public Regex Regex;\r
  83                 \r
  84                 const string GroupError = "{0} is not a valid group index for match '{1}'. The highest valid group index for this match is {2}";\r
  85                 const string CaptureError = "{0} is not a valid capture index for match '{1}'. The highest valid capture index for this match is {2}";\r
  86                 \r
  87                 public object GetMatchValue (Match match, Type castType)\r
  88                 {\r
  89                         if (Match.Group >= match.Groups.Count)\r
  90                                 throw new Exception (string.Format (GroupError, Match.Group, Field.Name, match.Groups.Count-1));\r
  91                                 \r
  92                         Group group = match.Groups [Match.Group];\r
  93                         if (Match.Capture >= group.Captures.Count)\r
  94                                 throw new Exception (string.Format (CaptureError, Match.Capture, Field.Name, group.Captures.Count-1));\r
  95                                 \r
  96                         string val = group.Captures [Match.Capture].Value;\r
  97                         return Convert.ChangeType (val, castType);\r
  98                 }\r
  99         }\r
 100 \r
 101 }\r