feat mapster tool

src/ExpressionTranslator/ExpressionTranslator.cs

@@ -11,6 +11,7 @@
 using System.Linq.Expressions;
 using System.Reflection;
 using System.Runtime.CompilerServices;
+using System.Xml.Linq;
 
 namespace ExpressionDebugger
 {
@@ -1268,6 +1269,88 @@ public Expression VisitLambda(LambdaExpression node, LambdaType type, string? me
             }
         }
 
+        public Expression VisitLambdaForGenerateMappers(LambdaExpression node, LambdaType type, Type InterfaceType, string? methodName = null,
+           bool isInternal = false)
+        {
+            VisitLambda(node, type, methodName, isInternal);
+
+            if (!isInternal)
+                isInternal = node.ReturnType.GetTypeInfo().IsNotPublic ||
+                             node.Parameters.Any(it => it.Type.GetTypeInfo().IsNotPublic);
+
+            if(!isInternal)
+                return node; // skip create interface implimentation if public only
+
+            if (type == LambdaType.PrivateLambda || type == LambdaType.PublicLambda)
+            {
+                _inlineCount++;
+                if (type == LambdaType.PublicLambda)
+                {
+                    var name = methodName != null ? $"{InterfaceType.FullName}.{methodName}" : "Main";
+                    WriteLine();
+                    var funcType = MakeDelegateType(node.ReturnType, node.Parameters.Select(it => it.Type).ToArray());
+                    var exprType = typeof(Expression<>).MakeGenericType(funcType);
+                    Write(Translate(exprType), " ", name, " => ");
+                }
+
+                IList<ParameterExpression> args;
+                if (node.Parameters.Count == 1)
+                {
+                    args = new List<ParameterExpression>();
+                    var arg = VisitParameter(node.Parameters[0]);
+                    args.Add((ParameterExpression)arg);
+                }
+                else
+                {
+                    args = VisitArguments("(", node.Parameters.ToList(), p => (ParameterExpression)VisitParameter(p),
+                        ")");
+                }
+
+                Write(" => ");
+                var body = VisitGroup(node.Body, ExpressionType.Quote);
+                if (type == LambdaType.PublicLambda)
+                    Write(";");
+                _inlineCount--;
+                return Expression.Lambda(body, node.Name, node.TailCall, args);
+            }
+            else
+            {
+                var name = methodName != null ? $"{InterfaceType.FullName}.{methodName}" : "Main";
+                if (type == LambdaType.PublicMethod || type == LambdaType.ExtensionMethod)
+                {
+                    if (!isInternal)
+                        isInternal = node.ReturnType.GetTypeInfo().IsNotPublic ||
+                                     node.Parameters.Any(it => it.Type.GetTypeInfo().IsNotPublic);
+                    WriteLine();
+                    Methods[name] = node.Type;
+                }
+                else
+                {
+                    name = GetName(node, name);
+                    WriteModifierNextLine("private");
+                }
+
+                Write(Translate(node.ReturnType), " ", name);
+                var open = "(";
+                if (type == LambdaType.ExtensionMethod)
+                {
+                    if (Definitions?.IsStatic != true)
+                        throw new InvalidOperationException("Extension method requires static class");
+                    if (node.Parameters.Count == 0)
+                        throw new InvalidOperationException("Extension method requires at least 1 parameter");
+                    open = "(this ";
+                }
+
+                var args = VisitArguments(open, node.Parameters, VisitParameterDeclaration, ")");
+                Indent();
+                var body = VisitBody(node.Body, true);
+
+                Outdent();
+
+                return Expression.Lambda(body, name, node.TailCall, args);
+            }
+        }
+
         private HashSet<LambdaExpression>? _visitedLambda;
         private int _writerLevel;
 
@@ -1865,9 +1948,16 @@ public override string ToString()
                             WriteNextLine("using ", ns, ";");
                         }
 
-                        WriteLine();
                     }
 
+                    foreach (var ns in Definitions.GeneratedAttributes.Select(x => x.NameSpace).Distinct())
+                    {
+                        WriteNextLine("using ", ns, ";");
+                    }
+
+                    if(_usings != null || Definitions.GeneratedAttributes.Count != 0)
+                        WriteLine();
+
                     // NOTE: type alias cannot solve all name conflicted case, user should use PrintFullTypeName
                     // keep logic here for compatibility
                     if (_typeNames != null)
@@ -1891,6 +1981,11 @@ public override string ToString()
                         Indent();
                     }
 
+                    foreach (var gAttr in Definitions.GeneratedAttributes)
+                    {
+                        WriteNextLine(gAttr.Implimentation);
+                    }
+
                     var isInternal = Definitions.IsInternal;
                     if (!isInternal)
                         isInternal = Definitions.Implements?.Any(it =>

src/ExpressionTranslator/Helpers/GeneratedAttributes/IGeneratedAttribute.cs

@@ -0,0 +1,11 @@
+namespace ExpressionDebugger.Helpers.GeneratedAttributes
+{
+    public interface IGeneratedAttribute
+    {
+        public string NameSpace { get;}
+        public string Declaration { get;}
+        public string Implimentation { get; }
+        public string FileName { get;}
+
+    }
+}

src/ExpressionTranslator/Helpers/GeneratedAttributes/MapsterToolGeneratedMapperAttribute.cs

@@ -0,0 +1,34 @@
+using System;
+using System.Text;
+
+namespace ExpressionDebugger.Helpers.GeneratedAttributes
+{
+    public class MapsterToolGeneratedMapperAttribute : GeneratedBase, IGeneratedAttribute
+    {
+        private readonly StringBuilder _Declaration;
+        private readonly string _NameSpace;
+
+        public string NameSpace => _NameSpace;
+
+        public string Declaration => _Declaration.ToString();
+
+        public string Implimentation => "[MapsterToolGeneratedMapper]";
+
+        public string FileName => "MapsterToolGeneratedMapperAttribute";
+
+       public MapsterToolGeneratedMapperAttribute(string extendedNameSpace)
+       {
+            if (String.IsNullOrEmpty(extendedNameSpace))
+                throw new ArgumentNullException("Extended namespace not specified or is null/empty string");
+
+            _NameSpace = $"Mapster.Generated.Attributes.{extendedNameSpace}";
+
+            _Declaration = new StringBuilder();
+
+            _Declaration.Append("using System;\r\n\r\n");
+            _Declaration.Append($"namespace {NameSpace}");
+            _Declaration.Append("\r\n{\r\n    public sealed class MapsterToolGeneratedMapperAttribute : Attribute\r\n    {\r\n\r\n    }\r\n} ");
+        }
+
+    }
+}

src/ExpressionTranslator/Helpers/GeneratedBase.cs

@@ -0,0 +1,18 @@
+namespace ExpressionDebugger.Helpers
+{
+    public abstract class GeneratedBase 
+    {
+        public override bool Equals(object obj)
+        {
+            if(obj is null)
+                return base.Equals(obj);
+            else
+                return this.GetType() == obj.GetType();
+        }
+
+        public override int GetHashCode()
+        {
+            return this.GetType().GetHashCode();
+        }
+    }
+}

src/ExpressionTranslator/Helpers/MemberInfoExtensions.cs

@@ -0,0 +1,33 @@
+using System;
+using System.Reflection;
+
+namespace ExpressionDebugger.Helpers
+{
+    public static class MemberInfoExtensions
+    {
+        public static bool IsPublicOrInternal(this MethodInfo method)
+        {
+            if (method == null) throw new ArgumentNullException(nameof(method));
+
+            return !method.IsPrivate
+                   && !method.IsFamily
+                   && !method.IsFamilyOrAssembly
+                   && !method.IsFamilyAndAssembly
+                   && (method.IsPublic || true);
+        }
+
+
+
+        public static bool IsGetterPublicOrInternal(this PropertyInfo property)
+        {
+            if (property == null) throw new ArgumentNullException(nameof(property));
+
+            MethodInfo? getMethod = property.GetMethod;
+
+            if (getMethod == null) return false;
+
+            return getMethod.IsPublicOrInternal();
+        }
+    }
+
+}

src/ExpressionTranslator/Helpers/RandomNamespaceGenerator.cs

@@ -0,0 +1,56 @@
+using System;
+using System.Text;
+
+namespace ExpressionDebugger.Helpers
+{
+    public static class RandomNamespaceGenerator
+    {
+        private static readonly Random _random = new Random();
+        private const string Consonants = "bcdfghjklmnpqrstvwxyzBCDFGHJKLMNPQRSTVWXYZ";
+        private const string Vowels = "aeiouAEIOU";
+        private const string Digits = "0123456789";
+
+        public static string Generate(int minParts = 2, int maxParts = 4)
+        {
+            if (minParts < 1) minParts = 1;
+            if (maxParts < minParts) maxParts = minParts;
+
+            int partsCount = _random.Next(minParts, maxParts + 1);
+            var sb = new StringBuilder();
+
+            for (int i = 0; i < partsCount; i++)
+            {
+                if (i > 0) sb.Append('.');
+                sb.Append(GeneratePart());
+            }
+
+            return sb.ToString();
+        }
+
+        private static string GeneratePart(int minLength = 2, int maxLength = 10)
+        {
+            if (minLength < 1) minLength = 1;
+            if (maxLength < minLength) maxLength = minLength;
+
+            int length = _random.Next(minLength, maxLength + 1);
+            var sb = new StringBuilder(length);
+
+            sb.Append(Consonants[_random.Next(Consonants.Length)]);
+
+            for (int i = 1; i < length; i++)
+            {
+                string pool = (i % 2 == 0) ? Vowels : Consonants;
+
+                if (_random.NextDouble() < 0.1)
+                {
+                    pool = Digits;
+                }
+
+                sb.Append(pool[_random.Next(pool.Length)]);
+            }
+
+            return sb.ToString();
+        }
+    }
+}
+

src/ExpressionTranslator/TypeDefinitions.cs

@@ -1,4 +1,5 @@
-using System;
+using ExpressionDebugger.Helpers.GeneratedAttributes;
+using System;
 using System.Collections.Generic;
 
 namespace ExpressionDebugger
@@ -12,6 +13,7 @@ public class TypeDefinitions
         public IEnumerable<Type>? Implements { get; set; }
         public bool PrintFullTypeName { get; set; }
         public bool IsRecordType { get; set; }
+        public HashSet<IGeneratedAttribute> GeneratedAttributes { get; set; } = new HashSet<IGeneratedAttribute>();
 
         /// <summary>
         /// Set to 2 to mark all properties as nullable

src/Mapster.Tool/MapperOptions.cs

@@ -28,6 +28,9 @@ public class MapperOptions
         [Option('N', "nullableDirective", Required = false, HelpText = "Set true to add \"#nullable enable\" to the top of generated mapper files")]
         public bool GenerateNullableDirective { get; set; }
 
+        [Option('H', "extNamespace", Required = false, HelpText = "Specify namespace to activate and generate additional features")]
+        public string? CreateHelpers { get; set; }
+
         [Usage(ApplicationAlias = "dotnet mapster mapper")]
         public static IEnumerable<Example> Examples =>
             new List<Example>