mcs/class/System.Web/System.Web.Compilation/ResourceExpressionBuilder.cs

   1 //
   2 // System.Web.Compilation.ResourceExpressionBuilder
   3 //
   4 // Authors:
   5 //      Chris Toshok (toshok@ximian.com)
   6 //
   7 // (C) 2006 Novell, Inc (http://www.novell.com)
   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 #if NET_2_0
  32
  33 using System;
  34 using System.CodeDom;
  35 using System.ComponentModel;
  36 using System.Reflection;
  37 using System.Web;
  38 using System.Web.UI;
  39
  40 namespace System.Web.Compilation {
  41
  42         [ExpressionEditor("System.Web.UI.Design.ResourceExpressionEditor, " + Consts.AssemblySystem_Design)]
  43         [ExpressionPrefix("Resources")]
  44         public class ResourceExpressionBuilder : ExpressionBuilder {
  45
  46                 public ResourceExpressionBuilder ()
  47                 {
  48                 }
  49
  50                 public override object EvaluateExpression (object target, BoundPropertyEntry entry, object parsedData, ExpressionBuilderContext context)
  51                 {
  52                         ResourceExpressionFields fields = parsedData as ResourceExpressionFields;
  53                         return HttpContext.GetGlobalResourceObject (fields.ClassKey, fields.ResourceKey);
  54                 }
  55
  56                 public override CodeExpression GetCodeExpression (BoundPropertyEntry entry, object parsedData, ExpressionBuilderContext context)
  57                 {
  58                         ResourceExpressionFields fields = parsedData as ResourceExpressionFields;
  59                         CodeExpression[] expr;
  60
  61                         // TODO: check what MS runtime does in this situation
  62                         if (entry == null)
  63                                 return null;
  64
  65                         if (!String.IsNullOrEmpty (fields.ClassKey)) {
  66                                 if (! (entry.PropertyInfo is PropertyInfo))
  67                                         return null; // TODO: check what MS runtime does here
  68
  69                                 expr = new CodeExpression [] {
  70                                         new CodePrimitiveExpression (fields.ClassKey),
  71                                         new CodePrimitiveExpression (fields.ResourceKey)
  72                                 };
  73                                 CodeMethodInvokeExpression getgro = new CodeMethodInvokeExpression (new CodeThisReferenceExpression (), "GetGlobalResourceObject", expr);
  74                                 return new CodeCastExpression (entry.PropertyInfo.PropertyType, getgro);
  75                         } else
  76                                 return CreateGetLocalResourceObject (entry.PropertyInfo, fields.ResourceKey);
  77                 }
  78
  79                 public static ResourceExpressionFields ParseExpression (string expression)
  80                 {
  81                         int comma = expression.IndexOf (',');
  82                         if (comma == -1)
  83                                 return new ResourceExpressionFields (expression.Trim ());
  84                         else
  85                                 return new ResourceExpressionFields (expression.Substring (0, comma).Trim (),
  86                                                                      expression.Substring (comma + 1).Trim ());
  87                 }
  88
  89                 public override object ParseExpression (string expression, Type propertyType, ExpressionBuilderContext context)
  90                 {
  91                         //FIXME: not sure what the propertyType should be used for
  92                         return ParseExpression (expression);
  93                 }
  94
  95                 public override bool SupportsEvaluate {
  96                         get { return true; }
  97                 }
  98
  99                 internal static CodeExpression CreateGetLocalResourceObject (MemberInfo mi, string resname)
 100                 {
 101                         Type member_type = null;
 102                         if (mi is PropertyInfo)
 103                                 member_type = ((PropertyInfo)mi).PropertyType;
 104                         else if (mi is FieldInfo)
 105                                 member_type = ((FieldInfo)mi).FieldType;
 106                         else
 107                                 return null; // an "impossible" case
 108
 109                         string memberName = mi.Name;
 110                         Type declaringType = mi.DeclaringType;
 111                         TypeConverter converter = TypeDescriptor.GetProperties (declaringType) [memberName].Converter;
 112
 113                         if (member_type != typeof (System.Drawing.Color) &&
 114                             (converter == null || converter.CanConvertFrom (typeof (String)))) {
 115                                 CodeMethodInvokeExpression getlro = new CodeMethodInvokeExpression (
 116                                         new CodeThisReferenceExpression (),
 117                                         "GetLocalResourceObject",
 118                                         new CodeExpression [] { new CodePrimitiveExpression (resname) });
 119
 120                                 CodeMethodInvokeExpression convert = new CodeMethodInvokeExpression ();
 121                                 convert.Method = new CodeMethodReferenceExpression (
 122                                         new CodeTypeReferenceExpression (typeof (System.Convert)),
 123                                         "ToString");
 124                                 convert.Parameters.Add (getlro);
 125                                 return convert;
 126                         } else {
 127                                 CodeMethodInvokeExpression getlro = new CodeMethodInvokeExpression (
 128                                         new CodeThisReferenceExpression (),
 129                                         "GetLocalResourceObject",
 130                                         new CodeExpression [] {
 131                                                 new CodePrimitiveExpression (resname),
 132                                                 new CodeTypeOfExpression (new CodeTypeReference (declaringType)),
 133                                                 new CodePrimitiveExpression (memberName)
 134                                         }
 135                                 );
 136
 137                                 return new CodeCastExpression (member_type, getlro);
 138                         }
 139                 }
 140         }
 141
 142 }
 143
 144 #endif
 145
 146