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

//
// System.Web.Compilation.ResourceExpressionBuilder
//
// Authors:
//	Chris Toshok ([email protected])
//
// (C) 2006-2010 Novell, Inc (http://www.novell.com)
//

//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//


using System;
using System.CodeDom;
using System.ComponentModel;
using System.Reflection;
using System.Web;
using System.Web.UI;

namespace System.Web.Compilation
{
	[ExpressionEditor("System.Web.UI.Design.ResourceExpressionEditor, " + Consts.AssemblySystem_Design)]
	[ExpressionPrefix("Resources")]
	public class ResourceExpressionBuilder : ExpressionBuilder
	{
		public ResourceExpressionBuilder ()
		{
		}

		public override object EvaluateExpression (object target, BoundPropertyEntry entry, object parsedData, ExpressionBuilderContext context)
		{
			ResourceExpressionFields fields = parsedData as ResourceExpressionFields;
			return HttpContext.GetGlobalResourceObject (fields.ClassKey, fields.ResourceKey);
		}

		public override CodeExpression GetCodeExpression (BoundPropertyEntry entry, object parsedData, ExpressionBuilderContext context)
		{
			ResourceExpressionFields fields = parsedData as ResourceExpressionFields;
			CodeExpression[] expr;

			// TODO: check what MS runtime does in this situation
			if (entry == null)
				return null;
			
			if (!String.IsNullOrEmpty (fields.ClassKey)) {
				if (! (entry.PropertyInfo is PropertyInfo))
					return null; // TODO: check what MS runtime does here
				
				expr = new CodeExpression [] {
					new CodePrimitiveExpression (fields.ClassKey),
					new CodePrimitiveExpression (fields.ResourceKey)
				};
				CodeMethodInvokeExpression getgro = new CodeMethodInvokeExpression (new CodeThisReferenceExpression (), "GetGlobalResourceObject", expr);
				return new CodeCastExpression (entry.PropertyInfo.PropertyType, getgro);
			} else
				return CreateGetLocalResourceObject (entry, fields.ResourceKey);
		}

		public static ResourceExpressionFields ParseExpression (string expression)
		{
			int comma = expression.IndexOf (',');
			if (comma == -1)
				return new ResourceExpressionFields (expression.Trim ());
			else
				return new ResourceExpressionFields (expression.Substring (0, comma).Trim (),
								     expression.Substring (comma + 1).Trim ());
		}

		public override object ParseExpression (string expression, Type propertyType, ExpressionBuilderContext context)
		{
			//FIXME: not sure what the propertyType should be used for
			return ParseExpression (expression);
		}

		public override bool SupportsEvaluate {
			get { return true; }
		}

		internal static CodeExpression CreateGetLocalResourceObject (BoundPropertyEntry bpe, string resname)
		{
			if (bpe == null || String.IsNullOrEmpty (resname))
				return null;

			if (bpe.UseSetAttribute)
				return CreateGetLocalResourceObject (bpe.Type, typeof (string), null, resname);
			else
				return CreateGetLocalResourceObject (bpe.PropertyInfo, resname);
		}
		
		internal static CodeExpression CreateGetLocalResourceObject (MemberInfo mi, string resname)
		{
			if (String.IsNullOrEmpty (resname))
				return null;
			
			Type member_type = null;
			if (mi is PropertyInfo)
				member_type = ((PropertyInfo)mi).PropertyType;
			else if (mi is FieldInfo)
				member_type = ((FieldInfo)mi).FieldType;
			else
				return null; // an "impossible" case

			return CreateGetLocalResourceObject (member_type, mi.DeclaringType, mi.Name, resname);
		}
		
		static CodeExpression CreateGetLocalResourceObject (Type member_type, Type declaringType, string memberName, string resname)
		{
			TypeConverter converter;

			if (!String.IsNullOrEmpty (memberName))
				converter = TypeDescriptor.GetProperties (declaringType) [memberName].Converter;
			else
				converter = null;

			if (member_type != typeof (System.Drawing.Color) &&
			    (converter == null || converter.CanConvertFrom (typeof (String)))) {
				CodeMethodInvokeExpression getlro = new CodeMethodInvokeExpression (
					new CodeThisReferenceExpression (),
					"GetLocalResourceObject",
					new CodeExpression [] { new CodePrimitiveExpression (resname) });
				
				return TemplateControlCompiler.CreateConvertToCall (Type.GetTypeCode (member_type), getlro);
			} else if (!String.IsNullOrEmpty (memberName)) {
				CodeMethodInvokeExpression getlro = new CodeMethodInvokeExpression (
					new CodeThisReferenceExpression (),
					"GetLocalResourceObject",
					new CodeExpression [] {
						new CodePrimitiveExpression (resname),
						new CodeTypeOfExpression (new CodeTypeReference (declaringType)),
						new CodePrimitiveExpression (memberName)
					}
				);

				return new CodeCastExpression (member_type, getlro);
			} else
				return null;
		}
	}

}