mcs/class/corlib/ReferenceSources/DefaultBinder.cs

   1 //
   2 // DefaultBinder.cs
   3 //
   4 // Authors:
   5 //      Marek Safar  <marek.safar@gmail.com>
   6 //
   7 // Copyright (C) 2015 Xamarin Inc (http://www.xamarin.com)
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining
  10 // a copy of this software and associated documentation files (the
  11 // "Software"), to deal in the Software without restriction, including
  12 // without limitation the rights to use, copy, modify, merge, publish,
  13 // distribute, sublicense, and/or sell copies of the Software, and to
  14 // permit persons to whom the Software is furnished to do so, subject to
  15 // the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be
  18 // included in all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27 //
  28
  29 namespace System
  30 {
  31         partial class DefaultBinder
  32         {
  33                 static bool CanConvertPrimitive (RuntimeType source, RuntimeType target)
  34                 {
  35                         if (source.IsEnum)
  36                                 return false;
  37
  38                         var from = Type.GetTypeCode (source);
  39                         var to = Type.GetTypeCode (target);
  40                         if (from == to && source.IsPrimitive)
  41                                 return true;
  42                         switch (to) {
  43                         case TypeCode.Char:
  44                                 switch (from) {
  45                                 case TypeCode.Byte:
  46                                 case TypeCode.UInt16:
  47                                         return true;
  48                                 }
  49                                 return false;
  50                         case TypeCode.Int16:
  51                                 switch (from) {
  52                                 case TypeCode.Byte:
  53                                 case TypeCode.SByte:
  54                                         return true;
  55                                 }
  56                                 return false;
  57                         case TypeCode.UInt16:
  58                                 switch (from) {
  59                                 case TypeCode.Byte:
  60                                 case TypeCode.Char:
  61                                         return true;
  62                                 }
  63                                 return false;
  64                         case TypeCode.Int32:
  65                                 switch (from) {
  66                                 case TypeCode.Byte:
  67                                 case TypeCode.SByte:
  68                                 case TypeCode.Char:
  69                                 case TypeCode.Int16:
  70                                 case TypeCode.UInt16:
  71                                         return true;
  72                                 }
  73                                 return false;
  74                         case TypeCode.UInt32:
  75                                 switch (from) {
  76                                 case TypeCode.Byte:
  77                                 case TypeCode.Char:
  78                                 case TypeCode.UInt16:
  79                                         return true;
  80                                 }
  81                                 return false;
  82                         case TypeCode.Int64:
  83                                 switch (from) {
  84                                 case TypeCode.Byte:
  85                                 case TypeCode.SByte:
  86                                 case TypeCode.Int16:
  87                                 case TypeCode.Char:
  88                                 case TypeCode.UInt16:
  89                                 case TypeCode.Int32:
  90                                 case TypeCode.UInt32:
  91                                         return true;
  92                                 }
  93                                 return false;
  94                         case TypeCode.UInt64:
  95                                 switch (from) {
  96                                 case TypeCode.Byte:
  97                                 case TypeCode.Char:
  98                                 case TypeCode.UInt16:
  99                                 case TypeCode.UInt32:
 100                                         return true;
 101                                 }
 102                                 return false;
 103                         case TypeCode.Single:
 104                                 switch (from) {
 105                                 case TypeCode.Byte:
 106                                 case TypeCode.SByte:
 107                                 case TypeCode.Int16:
 108                                 case TypeCode.Char:
 109                                 case TypeCode.UInt16:
 110                                 case TypeCode.Int32:
 111                                 case TypeCode.UInt32:
 112                                 case TypeCode.Int64:
 113                                 case TypeCode.UInt64:
 114                                         return true;
 115                                 }
 116                                 return false;
 117                         case TypeCode.Double:
 118                                 switch (from) {
 119                                 case TypeCode.Byte:
 120                                 case TypeCode.SByte:
 121                                 case TypeCode.Char:
 122                                 case TypeCode.Int16:
 123                                 case TypeCode.UInt16:
 124                                 case TypeCode.Int32:
 125                                 case TypeCode.UInt32:
 126                                 case TypeCode.Int64:
 127                                 case TypeCode.UInt64:
 128                                 case TypeCode.Single:
 129                                         return true;
 130                                 }
 131                                 return false;
 132                         }
 133
 134                         if (target == typeof (IntPtr))
 135                                 return source == target;
 136
 137                         if (target == typeof (UIntPtr))
 138                                 return source == target;
 139
 140                         return false;
 141                 }
 142
 143                 static bool CanConvertPrimitiveObjectToType (Object source, RuntimeType type)
 144                 {
 145                         if (source == null)
 146                                 return true;
 147
 148                         var st = source.GetType ();
 149                         return st == type || CanConvertPrimitive ((RuntimeType) st, type);
 150                 }
 151         }
 152 }