Reorganize folders and drop xml for now (#3394)

Using a simple flat folder structure vs the deeply nested structure in
autorest.csharp.

Under src we will have

- Expressions - Classes that inherit from ValueExpression
- OutputTypes - Types constructed from output library like
propertydeclaration, modeltypeprovider, etc
- PostProcessing - Classes that deal with roslyn post processing of
csharp files
- Snippets - Helper classes for expressions / statements
- SourceInput - Roslyn existing / custom code representation / converter
/ helper
- StartUp - Start up process for loading plugins and initiating the
generation
- Statements - Classes that inherit from MethodBodyStatement
- Utilities - Any extension on system types or general utilities
- Writers - Writers to convert output types into csharp files

packages/http-client-csharp/generator/Microsoft.Generator.CSharp.ClientModel/src/Expressions/SystemExtensibleSnippets.SystemRestOperationsSnippets.cs

@@ -1,4 +1,4 @@
-// Copyright (c) Microsoft Corporation. All rights reserved.
+// Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT License.
 
 using System;
@@ -63,11 +63,6 @@ public override MethodBodyStatement DeclareContentWithUtf8JsonWriter(out TypedVa
                 return Snippets.Var(contentVar, Snippets.New.Instance(typeof(Utf8JsonRequestBody)));
             }
 
-            public override MethodBodyStatement DeclareContentWithXmlWriter(out TypedValueExpression content, out XmlWriterExpression writer)
-            {
-                throw new NotImplementedException("Xml serialization isn't supported in System.Net.ClientModel yet");
-            }
-
             public override MethodBodyStatement InvokeServiceOperationCallAndReturnHeadAsBool(TypedValueExpression pipeline, TypedValueExpression message, TypedValueExpression clientDiagnostics, bool async)
             {
                 var resultVar = new VariableReference(typeof(NullableResult<bool>), "result");

packages/http-client-csharp/generator/Microsoft.Generator.CSharp.ClientModel/src/Expressions/SystemExtensibleSnippets.cs

@@ -1,4 +1,4 @@
-// Copyright (c) Microsoft Corporation. All rights reserved.
+// Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT License.
 
 using System;
@@ -9,8 +9,6 @@ namespace Microsoft.Generator.CSharp.ClientModel.Expressions
     internal partial class SystemExtensibleSnippets : ExtensibleSnippets
     {
         public override JsonElementSnippets JsonElement { get; } = new SystemJsonElementSnippets();
-        public override XElementSnippets XElement => throw new NotImplementedException("XElement extensions aren't supported in ClientModel plugin yet.");
-        public override XmlWriterSnippets XmlWriter => throw new NotImplementedException("XmlWriter extensions aren't supported in ClientModel plugin yet.");
         public override RestOperationsSnippets RestOperations { get; } = new SystemRestOperationsSnippets();
         public override ModelSnippets Model { get; } = new SystemModelSnippets();
     }

packages/http-client-csharp/generator/Microsoft.Generator.CSharp/src/Models/Serialization/SerializationFormat.cs → packages/http-client-csharp/generator/Microsoft.Generator.CSharp.Input/src/InputTypes/Serialization/SerializationFormat.cs

@@ -1,7 +1,7 @@
-// Copyright (c) Microsoft Corporation. All rights reserved.
+// Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT License.
 
-namespace Microsoft.Generator.CSharp
+namespace Microsoft.Generator.CSharp.Input
 {
     /// <summary>
     /// Represents the set of known serialization formats.

packages/http-client-csharp/generator/Microsoft.Generator.CSharp/src/CSharpGen.cs

@@ -6,13 +6,15 @@
 using System.IO;
 using System.Linq;
 using System.Threading.Tasks;
-using Microsoft.Generator.CSharp.Writers;
 
 namespace Microsoft.Generator.CSharp
 {
     public sealed class CSharpGen
     {
-        private static readonly string[] _filesToKeep = [Constants.DefaultCodeModelFileName, Constants.DefaultConfigurationFileName];
+        private const string ConfigurationFileName = "Configuration.json";
+        private const string CodeModelFileName = "tspCodeModel.json";
+
+        private static readonly string[] _filesToKeep = [ConfigurationFileName, CodeModelFileName];
 
         /// <summary>
         /// Executes the generator task with the <see cref="CodeModelPlugin"/> instance.
@@ -21,7 +23,7 @@ public async Task ExecuteAsync()
         {
             GeneratedCodeWorkspace.Initialize();
             var outputPath = CodeModelPlugin.Instance.Configuration.OutputDirectory;
-            var generatedTestOutputPath = Path.Combine(outputPath, "..", "..", "tests", Constants.DefaultGeneratedCodeFolderName);
+            var generatedTestOutputPath = Path.Combine(outputPath, "..", "..", "tests", "Generated");
 
             GeneratedCodeWorkspace workspace = await GeneratedCodeWorkspace.Create();
 

packages/http-client-csharp/generator/Microsoft.Generator.CSharp/src/GeneratedCodeWorkspace.cs → packages/http-client-csharp/generator/Microsoft.Generator.CSharp/src/PostProcessing/GeneratedCodeWorkspace.cs

@@ -1,4 +1,4 @@
-// Copyright (c) Microsoft Corporation. All rights reserved.
+// Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT License.
 
 using System;
@@ -18,8 +18,8 @@ namespace Microsoft.Generator.CSharp
 {
     internal class GeneratedCodeWorkspace
     {
-        public static readonly string GeneratedFolder = Constants.DefaultGeneratedCodeFolderName;
-        public static readonly string GeneratedTestFolder = Constants.DefaultGeneratedTestFolderName;
+        private const string GeneratedFolder = "Generated";
+        private const string GeneratedCodeProjectName = "GeneratedCode";
 
         private static readonly Lazy<IReadOnlyList<MetadataReference>> _assemblyMetadataReferences = new(() => new List<MetadataReference>()
             { MetadataReference.CreateFromFile(typeof(object).Assembly.Location) });
@@ -116,7 +116,7 @@ private static Project CreateGeneratedCodeProject()
             var workspace = new AdhocWorkspace();
             var newOptionSet = workspace.Options.WithChangedOption(FormattingOptions.NewLine, LanguageNames.CSharp, _newLine);
             workspace.TryApplyChanges(workspace.CurrentSolution.WithOptions(newOptionSet));
-            Project generatedCodeProject = workspace.AddProject(Constants.DefaultGeneratedCodeProjectFolderName, LanguageNames.CSharp);
+            Project generatedCodeProject = workspace.AddProject(GeneratedCodeProjectName, LanguageNames.CSharp);
 
             generatedCodeProject = generatedCodeProject
                 .AddMetadataReferences(_assemblyMetadataReferences.Value)

packages/http-client-csharp/generator/Microsoft.Generator.CSharp/src/Expressions/ExtensibleSnippets.RestOperationsSnippets.cs → packages/http-client-csharp/generator/Microsoft.Generator.CSharp/src/Snippets/ExtensibleSnippets.RestOperationsSnippets.cs

@@ -1,4 +1,4 @@
-// Copyright (c) Microsoft Corporation. All rights reserved.
+// Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT License.
 
 using System;
@@ -18,7 +18,6 @@ public abstract class RestOperationsSnippets
 
             public abstract MethodBodyStatement DeclareHttpMessage(MethodSignatureBase createRequestMethodSignature, out TypedValueExpression message);
             public abstract MethodBodyStatement DeclareContentWithUtf8JsonWriter(out TypedValueExpression content, out Utf8JsonWriterExpression writer);
-            public abstract MethodBodyStatement DeclareContentWithXmlWriter(out TypedValueExpression content, out XmlWriterExpression writer);
             public abstract MethodBodyStatement InvokeServiceOperationCallAndReturnHeadAsBool(TypedValueExpression pipeline, TypedValueExpression message, TypedValueExpression clientDiagnostics, bool async);
             public abstract StreamExpression GetContentStream(TypedValueExpression response);
         }

packages/http-client-csharp/generator/Microsoft.Generator.CSharp/src/Expressions/ExtensibleSnippets.cs → packages/http-client-csharp/generator/Microsoft.Generator.CSharp/src/Snippets/ExtensibleSnippets.cs

@@ -1,4 +1,4 @@
-// Copyright (c) Microsoft Corporation. All rights reserved.
+// Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT License.
 
 namespace Microsoft.Generator.CSharp.Expressions
@@ -8,8 +8,6 @@ public abstract partial class ExtensibleSnippets
         public abstract JsonElementSnippets JsonElement { get; }
         public abstract ModelSnippets Model { get; }
         public abstract RestOperationsSnippets RestOperations { get; }
-        public abstract XElementSnippets XElement { get; }
-        public abstract XmlWriterSnippets XmlWriter { get; }
 
         protected static InvokeStaticMethodExpression InvokeExtension(CSharpType extensionType, ValueExpression instance, string methodName)
             => new(extensionType, methodName, new[] { instance }, CallAsAsync: false, CallAsExtension: true);

packages/http-client-csharp/generator/Microsoft.Generator.CSharp/src/Expressions/Snippets.DeclarationStatements.cs → packages/http-client-csharp/generator/Microsoft.Generator.CSharp/src/Snippets/Snippets.DeclarationStatements.cs

@@ -1,4 +1,4 @@
-// Copyright (c) Microsoft Corporation. All rights reserved.
+// Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT License.
 
 using System;
@@ -73,9 +73,6 @@ public static MethodBodyStatement Var(string name, StringExpression value, out S
         public static MethodBodyStatement Var(string name, Utf8JsonWriterExpression value, out Utf8JsonWriterExpression variable)
             => Var(name, value, d => new Utf8JsonWriterExpression(d), out variable);
 
-        public static MethodBodyStatement Var(string name, XDocumentExpression value, out XDocumentExpression variable)
-            => Var(name, value, d => new XDocumentExpression(d), out variable);
-
         public static MethodBodyStatement Var(string name, TypedValueExpression value, out TypedValueExpression variable)
         {
             var reference = new VariableReference(value.Type, name);

packages/http-client-csharp/generator/Microsoft.Generator.CSharp/src/Expressions/Snippets.cs → packages/http-client-csharp/generator/Microsoft.Generator.CSharp/src/Snippets/Snippets.cs

@@ -59,10 +59,6 @@ public static TypedValueExpression RemoveAllNullConditional(TypedValueExpression
         public static BoolExpression Equal(ValueExpression left, ValueExpression right) => new(new BinaryOperatorExpression("==", left, right));
         public static BoolExpression NotEqual(ValueExpression left, ValueExpression right) => new(new BinaryOperatorExpression("!=", left, right));
 
-        public static BoolExpression Is(XElementExpression value, string name, out XElementExpression xElement)
-            => Is<XElementExpression>(value, name, d => new XElementExpression(d), out xElement);
-        public static BoolExpression Is(XAttributeExpression value, string name, out XAttributeExpression xAttribute)
-            => Is<XAttributeExpression>(value, name, d => new XAttributeExpression(d), out xAttribute);
         public static BoolExpression Is(ValueExpression left, ValueExpression right)
             => new(new BinaryOperatorExpression("is", left, right));