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) 2006-2010 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
  32 using System;
  33 using System.CodeDom;
  34 using System.ComponentModel;
  35 using System.Reflection;
  36 using System.Web;
  37 using System.Web.UI;
  38
  39 namespace System.Web.Compilation
  40 {
  41         [ExpressionEditor("System.Web.UI.Design.ResourceExpressionEditor, " + Consts.AssemblySystem_Design)]
  42         [ExpressionPrefix("Resources")]
  43         public class ResourceExpressionBuilder : ExpressionBuilder
  44         {
  45                 public ResourceExpressionBuilder ()
  46                 {
  47                 }
  48
  49                 public override object EvaluateExpression (object target, BoundPropertyEntry entry, object parsedData, ExpressionBuilderContext context)
  50                 {
  51                         ResourceExpressionFields fields = parsedData as ResourceExpressionFields;
  52                         return HttpContext.GetGlobalResourceObject (fields.ClassKey, fields.ResourceKey);
  53                 }
  54
  55                 public override CodeExpression GetCodeExpression (BoundPropertyEntry entry, object parsedData, ExpressionBuilderContext context)
  56                 {
  57                         ResourceExpressionFields fields = parsedData as ResourceExpressionFields;
  58                         CodeExpression[] expr;
  59
  60                         // TODO: check what MS runtime does in this situation
  61                         if (entry == null)
  62                                 return null;
  63
  64                         if (!String.IsNullOrEmpty (fields.ClassKey)) {
  65                                 if (! (entry.PropertyInfo is PropertyInfo))
  66                                         return null; // TODO: check what MS runtime does here
  67
  68                                 expr = new CodeExpression [] {
  69                                         new CodePrimitiveExpression (fields.ClassKey),
  70                                         new CodePrimitiveExpression (fields.ResourceKey)
  71                                 };
  72                                 CodeMethodInvokeExpression getgro = new CodeMethodInvokeExpression (new CodeThisReferenceExpression (), "GetGlobalResourceObject", expr);
  73                                 return new CodeCastExpression (entry.PropertyInfo.PropertyType, getgro);
  74                         } else
  75                                 return CreateGetLocalResourceObject (entry, fields.ResourceKey);
  76                 }
  77
  78                 public static ResourceExpressionFields ParseExpression (string expression)
  79                 {
  80                         int comma = expression.IndexOf (',');
  81                         if (comma == -1)
  82                                 return new ResourceExpressionFields (expression.Trim ());
  83                         else
  84                                 return new ResourceExpressionFields (expression.Substring (0, comma).Trim (),
  85                                                                      expression.Substring (comma + 1).Trim ());
  86                 }
  87
  88                 public override object ParseExpression (string expression, Type propertyType, ExpressionBuilderContext context)
  89                 {
  90                         //FIXME: not sure what the propertyType should be used for
  91                         return ParseExpression (expression);
  92                 }
  93
  94                 public override bool SupportsEvaluate {
  95                         get { return true; }
  96                 }
  97
  98                 internal static CodeExpression CreateGetLocalResourceObject (BoundPropertyEntry bpe, string resname)
  99                 {
 100                         if (bpe == null || String.IsNullOrEmpty (resname))
 101                                 return null;
 102
 103                         if (bpe.UseSetAttribute)
 104                                 return CreateGetLocalResourceObject (bpe.Type, typeof (string), null, resname);
 105                         else
 106                                 return CreateGetLocalResourceObject (bpe.PropertyInfo, resname);
 107                 }
 108
 109                 internal static CodeExpression CreateGetLocalResourceObject (MemberInfo mi, string resname)
 110                 {
 111                         if (String.IsNullOrEmpty (resname))
 112                                 return null;
 113
 114                         Type member_type = null;
 115                         if (mi is PropertyInfo)
 116                                 member_type = ((PropertyInfo)mi).PropertyType;
 117                         else if (mi is FieldInfo)
 118                                 member_type = ((FieldInfo)mi).FieldType;
 119                         else
 120                                 return null; // an "impossible" case
 121
 122                         return CreateGetLocalResourceObject (member_type, mi.DeclaringType, mi.Name, resname);
 123                 }
 124
 125                 static CodeExpression CreateGetLocalResourceObject (Type member_type, Type declaringType, string memberName, string resname)
 126                 {
 127                         TypeConverter converter;
 128
 129                         if (!String.IsNullOrEmpty (memberName))
 130                                 converter = TypeDescriptor.GetProperties (declaringType) [memberName].Converter;
 131                         else
 132                                 converter = null;
 133
 134                         if (member_type != typeof (System.Drawing.Color) &&
 135                             (converter == null || converter.CanConvertFrom (typeof (String)))) {
 136                                 CodeMethodInvokeExpression getlro = new CodeMethodInvokeExpression (
 137                                         new CodeThisReferenceExpression (),
 138                                         "GetLocalResourceObject",
 139                                         new CodeExpression [] { new CodePrimitiveExpression (resname) });
 140
 141                                 return TemplateControlCompiler.CreateConvertToCall (Type.GetTypeCode (member_type), getlro);
 142                         } else if (!String.IsNullOrEmpty (memberName)) {
 143                                 CodeMethodInvokeExpression getlro = new CodeMethodInvokeExpression (
 144                                         new CodeThisReferenceExpression (),
 145                                         "GetLocalResourceObject",
 146                                         new CodeExpression [] {
 147                                                 new CodePrimitiveExpression (resname),
 148                                                 new CodeTypeOfExpression (new CodeTypeReference (declaringType)),
 149                                                 new CodePrimitiveExpression (memberName)
 150                                         }
 151                                 );
 152
 153                                 return new CodeCastExpression (member_type, getlro);
 154                         } else
 155                                 return null;
 156                 }
 157         }
 158
 159 }
 160
 161
 162
 163