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

   1 //
   2 // System.Web.Services.Protocols.PatternMatcher.cs
   3 //
   4 // Author:
   5 //   Tim Coleman (tim@timcoleman.com)
   6 //
   7 // Copyright (C) Tim Coleman, 2002
   8 //
   9
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29 //
  30
  31 using System.Web.Services;
  32 using System.Reflection;
  33 using System.Text.RegularExpressions;
  34 using System.Collections;
  35
  36 namespace System.Web.Services.Protocols
  37 {
  38         public sealed class PatternMatcher
  39         {
  40                 Type _returnType;
  41                 MatchInfo[] _matchInfos;
  42
  43                 public PatternMatcher (Type type)
  44                 {
  45                         _returnType = type;
  46
  47                         FieldInfo[] fields = type.GetFields ();
  48                         ArrayList matchInfos = new ArrayList ();
  49
  50                         foreach (FieldInfo field in fields)
  51                         {
  52                                 object[] ats = field.GetCustomAttributes (typeof(MatchAttribute), true);
  53                                 if (ats.Length == 0) continue;
  54
  55                                 MatchInfo mi = new MatchInfo ();
  56                                 mi.Field = field;
  57                                 mi.Match = (MatchAttribute) ats[0];
  58
  59                                 RegexOptions opts = RegexOptions.Multiline;
  60                                 if (mi.Match.IgnoreCase) opts |= RegexOptions.IgnoreCase;
  61                                 mi.Regex = new Regex (mi.Match.Pattern, opts);
  62
  63                                 matchInfos.Add (mi);
  64                         }
  65                         _matchInfos = (MatchInfo[]) matchInfos.ToArray (typeof(MatchInfo));
  66                 }
  67
  68                 public object Match (string text)
  69                 {
  70                         object ob = Activator.CreateInstance (_returnType);
  71
  72                         foreach (MatchInfo mi in _matchInfos)
  73                         {
  74                                 MatchCollection matches = mi.Regex.Matches (text);
  75
  76                                 object res = null;
  77
  78                                 if (mi.Field.FieldType.IsArray)
  79                                 {
  80                                         int max = mi.Match.MaxRepeats;
  81                                         if (max == -1) max = matches.Count;
  82
  83                                         Type elemType = mi.Field.FieldType.GetElementType();
  84                                         Array array = Array.CreateInstance (elemType, max);
  85                                         for (int n=0; n<max; n++)
  86                                                 array.SetValue (mi.GetMatchValue (matches[n], elemType), n);
  87                                         res = array;
  88                                 }
  89                                 else if (matches.Count > 0)
  90                                         res = mi.GetMatchValue (matches[0], mi.Field.FieldType);
  91
  92                                 mi.Field.SetValue (ob, res);
  93                         }
  94                         return ob;
  95                 }
  96
  97         }
  98
  99         class MatchInfo
 100         {
 101                 public FieldInfo Field;
 102                 public MatchAttribute Match;
 103                 public Regex Regex;
 104
 105                 const string GroupError = "{0} is not a valid group index for match '{1}'. The highest valid group index for this match is {2}";
 106                 const string CaptureError = "{0} is not a valid capture index for match '{1}'. The highest valid capture index for this match is {2}";
 107
 108                 public object GetMatchValue (Match match, Type castType)
 109                 {
 110                         if (Match.Group >= match.Groups.Count)
 111                                 throw new Exception (string.Format (GroupError, Match.Group, Field.Name, match.Groups.Count-1));
 112
 113                         Group group = match.Groups [Match.Group];
 114                         if (Match.Capture >= group.Captures.Count)
 115                                 throw new Exception (string.Format (CaptureError, Match.Capture, Field.Name, group.Captures.Count-1));
 116
 117                         string val = group.Captures [Match.Capture].Value;
 118                         return Convert.ChangeType (val, castType);
 119                 }
 120         }
 121
 122 }