Updating ReflectOn.NameOf to support indexer calls

This is so that we can write stuff like this in aspx pages:
name="<%=Html.NameOf(m => m.PageEntries[pageIndex].PageId)%>"

--HG--
extra : convert_revision : svn%3A5ff7c347-ad56-4c35-b696-ccb81de16e03/trunk%4038939

src/Orchard.Tests/Orchard.Tests.csproj

@@ -130,6 +130,8 @@
     <Compile Include="Records\Foo.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="Stubs\StubHttpContext.cs" />
+    <Compile Include="Utility\ReflectOnTests.cs" />
+    <Compile Include="Utility\ReflectTests.cs" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\Orchard\Orchard.csproj">

src/Orchard.Tests/Utility/ReflectOnTests.cs

@@ -0,0 +1,74 @@
+using NUnit.Framework;
+using Orchard.Utility;
+
+namespace Orchard.Tests.Utility {
+    [TestFixture]
+    public class ReflectOnTests {
+        #region Setup/Teardown
+
+        [TestFixtureSetUp]
+        public void InitFixture() {
+        }
+
+        [TestFixtureTearDown]
+        public void TermFixture() {
+        }
+
+        #endregion
+
+        private class TestClass {
+            public int MyField;
+            public int MyField2;
+            public int MyProperty { get { MyField = 5; return MyField; } }
+            public int MyProperty2 { get { MyField2 = 5; return MyField2; } }
+            public void MyMethod(int i) { }
+            public int MyMethod(string s) { return 5; }
+            public void MyMethod2(int i) { }
+            public int MyMethod2(string s) { return 5; }
+            public TestClass MyTestClass { get { return null; } }
+            public TestClass this[int i] { get { return null; } }
+        }
+
+        [Test]
+        public void ReflectOnGetMemberShouldReturnCorrectMemberInfo() {
+            Assert.That(ReflectOn<TestClass>.GetMember(p => p.MyField).Name, Is.EqualTo("MyField"));
+            Assert.That(ReflectOn<TestClass>.GetMember(p => p.MyMethod(5)).Name, Is.EqualTo("MyMethod"));
+        }
+
+        [Test]
+        public void ReflectOnShouldWorkOnFields() {
+            Assert.That(ReflectOn<TestClass>.GetField(p => p.MyField).Name, Is.EqualTo("MyField"));
+            Assert.That(ReflectOn<TestClass>.GetField(p => p.MyField2).Name, Is.EqualTo("MyField2"));
+        }
+
+        [Test]
+        public void ReflectOnShouldWorkOnProperties() {
+            Assert.That(ReflectOn<TestClass>.GetProperty(p => p.MyProperty).Name, Is.EqualTo("MyProperty"));
+            Assert.That(ReflectOn<TestClass>.GetProperty(p => p.MyProperty2).Name, Is.EqualTo("MyProperty2"));
+        }
+
+        [Test]
+        public void ReflectOnShouldWorkOnMethods() {
+            Assert.That(ReflectOn<TestClass>.GetMethod(p => p.MyMethod(5)).Name, Is.EqualTo("MyMethod"));
+            Assert.That(ReflectOn<TestClass>.GetMethod(p => p.MyMethod("")).Name, Is.EqualTo("MyMethod"));
+            Assert.That(ReflectOn<TestClass>.GetMethod(p => p.MyMethod("")).ReturnType, Is.EqualTo(typeof(int)));
+
+            Assert.That(ReflectOn<TestClass>.GetMethod(p => p.MyMethod2(5)).Name, Is.EqualTo("MyMethod2"));
+            Assert.That(ReflectOn<TestClass>.GetMethod(p => p.MyMethod2("")).Name, Is.EqualTo("MyMethod2"));
+            Assert.That(ReflectOn<TestClass>.GetMethod(p => p.MyMethod2("")).ReturnType, Is.EqualTo(typeof(int)));
+        }
+
+        [Test]
+        public void ReflectOnShouldWorkOnDottedProperties() {
+            Assert.That(ReflectOn<TestClass>.NameOf(p => p.MyTestClass.MyTestClass.MyProperty), Is.EqualTo("MyTestClass.MyTestClass.MyProperty"));
+        }
+
+        [Test]
+        public void ReflectOnShouldWorkOnIndexers() {
+            Assert.That(ReflectOn<TestClass>.NameOf(p => p[0].MyTestClass[1].MyProperty), Is.EqualTo("[0].MyTestClass[1].MyProperty"));
+            int j = 5;
+            int index = j;
+            Assert.That(ReflectOn<TestClass>.NameOf(p => p.MyTestClass[index].MyProperty), Is.EqualTo("MyTestClass[5].MyProperty"));
+        }
+    }
+}

src/Orchard.Tests/Utility/ReflectTests.cs

@@ -0,0 +1,47 @@
+using NUnit.Framework;
+using Orchard.Utility;
+
+namespace Orchard.Tests.Utility {
+    [TestFixture]
+    public class ReflectTests {
+        private class TestClass {
+            public static int MyField;
+            public static int MyField2;
+            public static int MyProperty { get { MyField = 5; return MyField; } }
+            public static int MyProperty2 { get { MyField2 = 5; return MyField2; } }
+            public static void MyMethod(int i) { }
+            public static int MyMethod(string s) { return 5; }
+            public static void MyMethod2(int i) { }
+            public static int MyMethod2(string s) { return 5; }
+        }
+
+        [Test]
+        public void ReflectGetMemberShouldReturnCorrectMemberInfo() {
+            Assert.That(Reflect.GetMember(() => TestClass.MyField).Name, Is.EqualTo("MyField"));
+            Assert.That(Reflect.GetMember(() => TestClass.MyMethod(5)).Name, Is.EqualTo("MyMethod"));
+        }
+
+        [Test]
+        public void ReflectShouldWorkOnFields() {
+            Assert.That(Reflect.GetField(() => TestClass.MyField).Name, Is.EqualTo("MyField"));
+            Assert.That(Reflect.GetField(() => TestClass.MyField2).Name, Is.EqualTo("MyField2"));
+        }
+
+        [Test]
+        public void ReflectShouldWorkOnProperties() {
+            Assert.That(Reflect.GetProperty(() => TestClass.MyProperty).Name, Is.EqualTo("MyProperty"));
+            Assert.That(Reflect.GetProperty(() => TestClass.MyProperty2).Name, Is.EqualTo("MyProperty2"));
+        }
+
+        [Test]
+        public void ReflectShouldWorkOnMethods() {
+            Assert.That(Reflect.GetMethod(() => TestClass.MyMethod(5)).Name, Is.EqualTo("MyMethod"));
+            Assert.That(Reflect.GetMethod(() => TestClass.MyMethod("")).Name, Is.EqualTo("MyMethod"));
+            Assert.That(Reflect.GetMethod(() => TestClass.MyMethod("")).ReturnType, Is.EqualTo(typeof(int)));
+
+            Assert.That(Reflect.GetMethod(() => TestClass.MyMethod2(5)).Name, Is.EqualTo("MyMethod2"));
+            Assert.That(Reflect.GetMethod(() => TestClass.MyMethod2("")).Name, Is.EqualTo("MyMethod2"));
+            Assert.That(Reflect.GetMethod(() => TestClass.MyMethod2("")).ReturnType, Is.EqualTo(typeof(int)));
+        }
+    }
+}

src/Orchard.Web/Packages/Orchard.CmsPages/Views/Admin/BulkDeleteConfirm.aspx

@@ -36,10 +36,8 @@
                 int pageIndex = 0;
                 foreach (var pageEntry in Model.PageEntries.Where(e => e.IsChecked)) {
             %>
-                    <%--TODO: Use "NameOf" when it supports these expressions--%>
-                    <input type="hidden" value="<%=pageEntry.PageId %>" name="<%=string.Format("PageEntries[{0}].PageId", pageIndex)%>"/>
-                    <input type="hidden" value="<%=pageEntry.IsChecked %>" name="<%=string.Format("PageEntries[{0}].IsChecked", pageIndex)%>"/>
-
+                    <input type="hidden" value="<%=pageEntry.PageId %>" name="<%=Html.NameOf(m => m.PageEntries[pageIndex].PageId)%>"/>
+                    <input type="hidden" value="<%=pageEntry.IsChecked %>" name="<%=Html.NameOf(m => m.PageEntries[pageIndex].IsChecked)%>"/>
             <%  pageIndex++;
             }%>
         <%}/*EndForm*/%>

src/Orchard.Web/Packages/Orchard.CmsPages/Views/Admin/BulkPublishLater.aspx

@@ -35,9 +35,8 @@
                 int pageIndex = 0;
                 foreach (var pageEntry in Model.PageEntries.Where(e => e.IsChecked)) {
             %>
-                    <%--TODO: Use "NameOf" when it supports these expressions--%>
-                    <input type="hidden" value="<%=pageEntry.PageId %>" name="<%=string.Format("PageEntries[{0}].PageId", pageIndex)%>"/>
-                    <input type="hidden" value="<%=pageEntry.IsChecked %>" name="<%=string.Format("PageEntries[{0}].IsChecked", pageIndex)%>"/>
+                    <input type="hidden" value="<%=pageEntry.PageId %>" name="<%=Html.NameOf(m => m.PageEntries[pageIndex].PageId)%>"/>
+                    <input type="hidden" value="<%=pageEntry.IsChecked %>" name="<%=Html.NameOf(m => m.PageEntries[pageIndex].IsChecked)%>"/>
             <%  pageIndex++;
             }%>
     </div>

src/Orchard.Web/Packages/Orchard.CmsPages/Views/Admin/Index.aspx

@@ -99,9 +99,8 @@ string SplitDateTime(DateTime dt)
             %>
             <tr>
                 <td>
-                    <%--TODO: Use "NameOf" when it supports these expressions--%>
-                    <input type="hidden" value="<%=Model.PageEntries[pageIndex].PageId %>" name="<%=string.Format("PageEntries[{0}].PageId", pageIndex)%>"/>
-                    <input type="checkbox" value="true" name="<%=string.Format("PageEntries[{0}].IsChecked", pageIndex)%>"/>
+                    <input type="hidden" value="<%=Model.PageEntries[pageIndex].PageId %>" name="<%=Html.NameOf(m => m.PageEntries[pageIndex].PageId)%>"/>
+                    <input type="checkbox" value="true" name="<%=Html.NameOf(m => m.PageEntries[pageIndex].IsChecked)%>"/>
                 </td>
                 <td>
                 <% if (pageEntry.IsPublished) { %>

src/Orchard/Utility/Reflect.cs

@@ -1,7 +1,10 @@
 using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
 using System.Linq.Expressions;
 using System.Reflection;
-using System.Web.Mvc;
+using System.Text;
+using System.Linq;
 using Orchard.Validation;
 
 namespace Orchard.Utility {
@@ -45,11 +48,11 @@ namespace Orchard.Utility {
         }
 
         public static string NameOf<T>(T value, Expression<Action<T>> expression) {
-            return GetNameOf(expression.Body);
+            return GetNameOf(expression);
         }
 
         public static string NameOf<T, TResult>(T value, Expression<Func<T, TResult>> expression) {
-            return GetNameOf(expression.Body);
+            return GetNameOf(expression);
         }
 
         internal static MemberInfo GetMemberInfo(LambdaExpression lambda) {
@@ -76,18 +79,108 @@ namespace Orchard.Utility {
             return memberExpression;
         }
 
-        internal static string GetNameOf(Expression expression) {
-            MemberExpression memberExpression = GetMemberExpression(expression);
-            if (memberExpression == null) {
-                LambdaExpression lambda = expression as LambdaExpression;
-                if (lambda == null)
-                    return null;
-                return GetMemberInfo(lambda).Name;
+        internal static void AddNames(Expression expression, NameBuilder nb) {
+            if (expression == null)
+                return;
+
+            switch (expression.NodeType) {
+                case ExpressionType.MemberAccess:
+                    var memberExpression = (MemberExpression)expression;
+                    AddNames(memberExpression.Expression, nb);
+                    if (nb.DotNeeded)
+                        nb.Append(".");
+                    nb.Append(memberExpression.Member.Name);
+                    break;
+
+                //case ExpressionType.Convert:
+                //    var unaryExpression = (UnaryExpression)expression;
+                //    AddNames(unaryExpression.Operand, nb);
+                //    break;
+
+                case ExpressionType.Call:
+                    var callExpression = (MethodCallExpression)expression;
+                    MethodInfo method = callExpression.Method;
+                    bool isIndexer = (method.Name == "get_Item" && method.IsSpecialName);
+                    if (!isIndexer) {
+                        goto default;
+                    }
+
+                    AddNames(callExpression.Object, nb);
+                    nb.Append("[" + GetArguments(callExpression.Arguments).Aggregate((a, b) => a + b) + "]");
+                    break;
+
+                case ExpressionType.Parameter:
+                    break;
+
+                default:
+                    throw new InvalidOperationException(
+                        string.Format("Unsupported expression type \"{0}\" in named expression", Enum.GetName(typeof(ExpressionType), expression.NodeType)));
+            }
+        }
+
+        private static IEnumerable<string> GetArguments(IEnumerable<Expression> expressions) {
+            foreach (var expression in expressions) {
+                object value = GetExpressionConstantValue(expression);
+                string result = value == null ? null : value.ToString();
+                yield return result;
+            }
+        }
+
+        private static object GetExpressionConstantValue(Expression expression) {
+            switch (expression.NodeType) {
+                case ExpressionType.Constant:
+                    var constantExpression = (ConstantExpression)expression;
+                    return constantExpression.Value;
+
+                case ExpressionType.MemberAccess:
+                    var memberExpression = (MemberExpression)expression;
+                    object value = GetExpressionConstantValue(memberExpression.Expression);
+                    if (value == null)
+                        throw new InvalidOperationException("Member access to \"null\" instance is not supported");
+
+                    FieldInfo fieldInfo = memberExpression.Member as FieldInfo;
+                    if (fieldInfo != null){
+                        return fieldInfo.GetValue(value);
+                    }
+
+                    PropertyInfo propertyInfo = memberExpression.Member as PropertyInfo;
+                    if (propertyInfo != null) {
+                        return propertyInfo.GetValue(value, null);
+                    }
+                    throw new InvalidOperationException(
+                        string.Format("Member access expression \"{0}\" not supported", memberExpression.GetType().FullName));
+
+                default:
+                    throw new InvalidOperationException(
+                        string.Format("Unsupported expression type\"{0}\" in method or indexer argument", Enum.GetName(typeof(ExpressionType), expression.NodeType)));
+            }
+        }
+
+        internal static string GetNameOf(LambdaExpression expression) {
+            var nb = new NameBuilder(expression);
+            AddNames(expression.Body, nb);
+            return nb.ToString();
+        }
+
+        internal class NameBuilder {
+            private readonly StringBuilder _stringBuilder = new StringBuilder();
+            private readonly LambdaExpression _expression;
+
+            public NameBuilder(LambdaExpression expression) {
+                _expression = expression;
+            }
+
+            public override string ToString() {
+                return _stringBuilder.ToString();
+            }
+
+            public bool DotNeeded {
+                get { return _stringBuilder.Length > 0; }
+            }
+
+                public void Append(string s) {
+                _stringBuilder.Append(s);
             }
-            string parentName = GetNameOf(memberExpression.Expression);
-            if (parentName == null)
-                return memberExpression.Member.Name;
-            return parentName + "." + memberExpression.Member.Name;
         }
     }
 }

src/Orchard/Utility/ReflectOn.cs

@@ -50,11 +50,11 @@ namespace Orchard.Utility {
         }
 
         public static string NameOf(Expression<Action<T>> expression) {
-            return Reflect.GetNameOf(expression.Body);
+            return Reflect.GetNameOf(expression);
         }
 
         public static string NameOf<TResult>(Expression<Func<T, TResult>> expression) {
-            return Reflect.GetNameOf(expression.Body);
+            return Reflect.GetNameOf(expression);
         }
     }
 }