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, 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 (BoundPropertyEntry bpe, string resname)
 100                 {
 101                         if (bpe == null || String.IsNullOrEmpty (resname))
 102                                 return null;
 103
 104                         if (bpe.UseSetAttribute)
 105                                 return CreateGetLocalResourceObject (bpe.Type, typeof (string), null, resname);
 106                         else
 107                                 return CreateGetLocalResourceObject (bpe.PropertyInfo, resname);
 108                 }
 109
 110                 internal static CodeExpression CreateGetLocalResourceObject (MemberInfo mi, string resname)
 111                 {
 112                         if (String.IsNullOrEmpty (resname))
 113                                 return null;
 114
 115                         Type member_type = null;
 116                         if (mi is PropertyInfo)
 117                                 member_type = ((PropertyInfo)mi).PropertyType;
 118                         else if (mi is FieldInfo)
 119                                 member_type = ((FieldInfo)mi).FieldType;
 120                         else
 121                                 return null; // an "impossible" case
 122
 123                         return CreateGetLocalResourceObject (member_type, mi.DeclaringType, mi.Name, resname);
 124                 }
 125
 126                 static CodeExpression CreateGetLocalResourceObject (Type member_type, Type declaringType, string memberName, string resname)
 127                 {
 128                         TypeConverter converter;
 129
 130                         if (!String.IsNullOrEmpty (memberName))
 131                                 converter = TypeDescriptor.GetProperties (declaringType) [memberName].Converter;
 132                         else
 133                                 converter = null;
 134
 135                         if (member_type != typeof (System.Drawing.Color) &&
 136                             (converter == null || converter.CanConvertFrom (typeof (String)))) {
 137                                 CodeMethodInvokeExpression getlro = new CodeMethodInvokeExpression (
 138                                         new CodeThisReferenceExpression (),
 139                                         "GetLocalResourceObject",
 140                                         new CodeExpression [] { new CodePrimitiveExpression (resname) });
 141
 142                                 CodeMethodInvokeExpression convert = new CodeMethodInvokeExpression ();
 143                                 convert.Method = new CodeMethodReferenceExpression (
 144                                         new CodeTypeReferenceExpression (typeof (System.Convert)),
 145                                         "ToString");
 146                                 convert.Parameters.Add (getlro);
 147                                 convert.Parameters.Add (new CodePropertyReferenceExpression (
 148                                                                 new CodeTypeReferenceExpression (typeof (System.Globalization.CultureInfo)),
 149                                                                 "CurrentCulture")
 150                                 );
 151
 152                                 return convert;
 153                         } else if (!String.IsNullOrEmpty (memberName)) {
 154                                 CodeMethodInvokeExpression getlro = new CodeMethodInvokeExpression (
 155                                         new CodeThisReferenceExpression (),
 156                                         "GetLocalResourceObject",
 157                                         new CodeExpression [] {
 158                                                 new CodePrimitiveExpression (resname),
 159                                                 new CodeTypeOfExpression (new CodeTypeReference (declaringType)),
 160                                                 new CodePrimitiveExpression (memberName)
 161                                         }
 162                                 );
 163
 164                                 return new CodeCastExpression (member_type, getlro);
 165                         } else
 166                                 return null;
 167                 }
 168         }
 169
 170 }
 171
 172 #endif
 173
 174