Simpler to just visit the parameter. (#154)

Author: BlaiseD

src/AutoMapper.Extensions.ExpressionMapping/PrependParentNameVisitor.cs

@@ -1,7 +1,4 @@
-using AutoMapper.Extensions.ExpressionMapping.Extensions;
-using System.Linq;
-using System.Linq.Expressions;
-using System.Runtime.CompilerServices;
+using System.Linq.Expressions;
 
 namespace AutoMapper.Extensions.ExpressionMapping
 {
@@ -29,112 +26,5 @@ protected override Expression VisitParameter(ParameterExpression node)
 
             return base.VisitParameter(node);
         }
-
-        protected override Expression VisitTypeBinary(TypeBinaryExpression node)
-        {
-            if (!(node.Expression is ParameterExpression))
-                return base.VisitTypeBinary(node);
-
-            if (!object.ReferenceEquals(CurrentParameter, node.GetParameterExpression()))
-                return base.VisitTypeBinary(node);
-
-            return Expression.TypeIs
-            (
-                string.IsNullOrEmpty(ParentFullName)
-                    ? NewParameter
-                    : ExpressionHelpers.MemberAccesses(ParentFullName, NewParameter),
-                node.TypeOperand
-            );
-        }
-
-        protected override Expression VisitMember(MemberExpression node)
-        {
-            if (node.NodeType == ExpressionType.Constant)
-                return base.VisitMember(node);
-
-            if (!object.ReferenceEquals(CurrentParameter, node.GetParameterExpression()) || !node.IsMemberExpression())
-                return base.VisitMember(node);
-
-            return ExpressionHelpers.MemberAccesses
-            (
-                string.IsNullOrEmpty(ParentFullName)
-                        ? node.GetPropertyFullName()
-                        : $"{ParentFullName}.{node.GetPropertyFullName()}",
-                NewParameter
-            );
-        }
-
-        protected override Expression VisitMethodCall(MethodCallExpression node)
-        {
-            if (!IsParentParameterExpression())
-                return base.VisitMethodCall(node);
-
-            if (!object.ReferenceEquals(CurrentParameter, node.GetParameterExpression()))
-                return base.VisitMethodCall(node);
-
-            if (node.Method.IsStatic)
-            {
-                if (!IsExtentionMethod())
-                    return base.VisitMethodCall(node);
-
-                if (node.Method.IsGenericMethod)
-                    return Expression.Call
-                    (
-                        node.Method.DeclaringType,
-                        node.Method.Name,
-                        node.Method.GetGenericArguments(),
-                        GetNewArgumentsForExtensionMethod()
-                    );
-                else
-                    return Expression.Call(node.Method, GetNewArgumentsForExtensionMethod());
-            }
-
-            //instance method
-            if (node.Method.IsGenericMethod)
-            {
-                return Expression.Call
-                (
-                    GetNewParent(),
-                    node.Method.Name,
-                    node.Method.GetGenericArguments(),
-                    node.Arguments.ToArray()
-                );
-            }
-            else
-            {
-                return Expression.Call
-                (
-                    GetNewParent(),
-                    node.Method,
-                    node.Arguments
-                );
-            }
-
-            Expression[] GetNewArgumentsForExtensionMethod()
-            {
-                Expression[] arguments = node.Arguments.ToArray();
-                arguments[0] = GetNewParent();
-                return arguments.ToArray();
-            }
-
-            Expression GetNewParent()
-                => string.IsNullOrEmpty(ParentFullName)
-                ? NewParameter
-                : ExpressionHelpers.MemberAccesses(ParentFullName, NewParameter);
-
-            bool IsParentParameterExpression()
-            {
-                if (node.Method.IsStatic)
-                    return node.Arguments[0] is ParameterExpression;
-
-                if (!node.Method.IsStatic)
-                    return node.Object is ParameterExpression;
-
-                return false;
-            }
-
-            bool IsExtentionMethod()
-                => node.Method.IsDefined(typeof(ExtensionAttribute), true);
-        }
     }
 }

tests/AutoMapper.Extensions.ExpressionMapping.UnitTests/CanMapParameterBodyFromChildReferenceWithoutMemberExpression.cs

@@ -33,7 +33,7 @@ public void Can_map_parameter_body_from_child_reference_without_member_expressio
             var mappedExpression = mapper.MapExpression<Expression<Func<TestProduct, bool>>>(expr);
 
             //Assert
-            Assert.Equal("x => (Convert(Property(x.Category, \"BrandId\"), Int32) == 2)", mappedExpression.ToString());
+            Assert.Equal("x => (Property(x.Category, \"BrandId\") == 2)", mappedExpression.ToString());
         }
 
         public class TestCategory

tests/AutoMapper.Extensions.ExpressionMapping.UnitTests/CanMapParameterBodyWithoutMemberExpression.cs

@@ -30,7 +30,7 @@ public void Can_map_parameter_body_without_member_expression()
             var mappedExpression = mapper.MapExpression<Expression<Func<TestProduct, bool>>>(expr);
 
             //Assert
-            Assert.Equal("x => (Convert(Property(x, \"BrandId\"), Int32) == 2)", mappedExpression.ToString());
+            Assert.Equal("x => (Property(x, \"BrandId\") == 2)", mappedExpression.ToString());
         }
 
         public class TestProduct

tests/AutoMapper.Extensions.ExpressionMapping.UnitTests/EF.cs

@@ -1,12 +1,10 @@
-using System;
-
-namespace AutoMapper.Extensions.ExpressionMapping.UnitTests
+namespace AutoMapper.Extensions.ExpressionMapping.UnitTests
 {
     internal class EF
     {
-        internal static object Property<T>(object p, string v)
+        internal static T Property<T>(object p, string v)
         {
-            throw new NotImplementedException();
+            return default;
         }
     }
 }