Flow RootNamespace from MSBuild (dotnet/aspnetcore-tooling#331)

- Flow Root namespace through in command line builds

- Flow Root namespace through in design time builds

- Feedback\n\nCommit migrated from 057d4f3570

src/Razor/Microsoft.AspNetCore.Mvc.Razor.Extensions/test/TestFiles/IntegrationTests/CodeGenerationIntegrationTest/BasicComponent_DesignTime.codegen.cs

@@ -1,6 +1,6 @@
 // <auto-generated/>
 #pragma warning disable 1591
-namespace __BlazorGenerated
+namespace __GeneratedComponent
 {
     #line hidden
     using TModel = global::System.Object;

src/Razor/Microsoft.AspNetCore.Mvc.Razor.Extensions/test/TestFiles/IntegrationTests/CodeGenerationIntegrationTest/BasicComponent_DesignTime.ir.txt

@@ -1,5 +1,5 @@
 Document - 
-    NamespaceDeclaration -  - __BlazorGenerated
+    NamespaceDeclaration -  - __GeneratedComponent
         UsingDirective -  - TModel = global::System.Object
         UsingDirective - (1:0,1 [12] ) - System
         UsingDirective - (16:1,1 [32] ) - System.Collections.Generic

src/Razor/Microsoft.AspNetCore.Mvc.Razor.Extensions/test/TestFiles/IntegrationTests/CodeGenerationIntegrationTest/BasicComponent_DesignTime.mappings.txt

@@ -1,23 +1,23 @@
 Source Location: (12:0,12 [11] TestFiles/IntegrationTests/CodeGenerationIntegrationTest/BasicComponent.cshtml)
 |IDisposable|
-Generated Location: (662:17,0 [11] )
+Generated Location: (665:17,0 [11] )
 |IDisposable|
 
 Source Location: (38:1,13 [15] TestFiles/IntegrationTests/CodeGenerationIntegrationTest/BasicComponent.cshtml)
 |this.ToString()|
-Generated Location: (1258:33,13 [15] )
+Generated Location: (1261:33,13 [15] )
 |this.ToString()|
 
 Source Location: (79:3,5 [29] TestFiles/IntegrationTests/CodeGenerationIntegrationTest/BasicComponent.cshtml)
 |string.Format("{0}", "Hello")|
-Generated Location: (1403:38,6 [29] )
+Generated Location: (1406:38,6 [29] )
 |string.Format("{0}", "Hello")|
 
 Source Location: (132:6,12 [37] TestFiles/IntegrationTests/CodeGenerationIntegrationTest/BasicComponent.cshtml)
 |
     void IDisposable.Dispose(){ }
 |
-Generated Location: (1617:45,12 [37] )
+Generated Location: (1620:45,12 [37] )
 |
     void IDisposable.Dispose(){ }
 |

src/Razor/Microsoft.AspNetCore.Mvc.Razor.Extensions/test/TestFiles/IntegrationTests/CodeGenerationIntegrationTest/BasicComponent_Runtime.codegen.cs

@@ -1,7 +1,7 @@
 #pragma checksum "TestFiles/IntegrationTests/CodeGenerationIntegrationTest/BasicComponent.cshtml" "{ff1816ec-aa5e-4d10-87f7-6f4963833460}" "d3c3d6059615673cb46fc4974164d61eabadb890"
 // <auto-generated/>
 #pragma warning disable 1591
-namespace __BlazorGenerated
+namespace __GeneratedComponent
 {
     #line hidden
     using System;

src/Razor/Microsoft.AspNetCore.Mvc.Razor.Extensions/test/TestFiles/IntegrationTests/CodeGenerationIntegrationTest/BasicComponent_Runtime.ir.txt

@@ -1,5 +1,5 @@
 Document - 
-    NamespaceDeclaration -  - __BlazorGenerated
+    NamespaceDeclaration -  - __GeneratedComponent
         UsingDirective - (1:0,1 [14] ) - System
         UsingDirective - (16:1,1 [34] ) - System.Collections.Generic
         UsingDirective - (51:2,1 [19] ) - System.Linq

src/Razor/Microsoft.AspNetCore.Razor.Language/src/Components/ComponentDocumentClassifierPass.cs

@@ -18,11 +18,10 @@ namespace Microsoft.AspNetCore.Razor.Language.Components
         private static readonly char[] NamespaceSeparators = new char[] { '.' };
 
         /// <summary>
-        /// The base namespace.
+        /// The fallback value of the root namespace. Only used if the fallback root namespace
+        /// was not passed in.
         /// </summary>
-        // This is a fallback value and will only be used if we can't compute
+        public string FallbackRootNamespace { get; set; } = "__GeneratedComponent";
-        // a reasonable namespace.
-        public string BaseNamespace { get; set; } = "__BlazorGenerated";
 
         /// <summary>
         /// Gets or sets whether to mangle class names.
@@ -58,7 +57,9 @@ namespace Microsoft.AspNetCore.Razor.Language.Components
             ClassDeclarationIntermediateNode @class,
             MethodDeclarationIntermediateNode method)
         {
+            var options = codeDocument.GetDocumentIntermediateNode().Options;
             if (!TryComputeNamespaceAndClass(
+                options,
                 codeDocument.Source.FilePath,
                 codeDocument.Source.RelativePath,
                 out var computedNamespace,
@@ -66,7 +67,7 @@ namespace Microsoft.AspNetCore.Razor.Language.Components
             {
                 // If we can't compute a nice namespace (no relative path) then just generate something
                 // mangled.
-                computedNamespace = BaseNamespace;
+                computedNamespace = FallbackRootNamespace;
                 var checksum = Checksum.BytesToString(codeDocument.Source.GetChecksum());
                 computedClass = $"AspNetCore_{checksum}";
             }
@@ -125,7 +126,12 @@ namespace Microsoft.AspNetCore.Razor.Language.Components
         //
         // However all kinds of thing are possible in tools. We shouldn't barf here if the document isn't 
         // set up correctly.
-        private bool TryComputeNamespaceAndClass(string filePath, string relativePath, out string @namespace, out string @class)
+        private bool TryComputeNamespaceAndClass(
+            RazorCodeGenerationOptions options, 
+            string filePath, 
+            string relativePath, 
+            out string @namespace, 
+            out string @class)
         {
             if (filePath == null || relativePath == null || filePath.Length <= relativePath.Length)
             {
@@ -134,14 +140,8 @@ namespace Microsoft.AspNetCore.Razor.Language.Components
                 return false;
             }
 
-            // Try and infer a namespace from the project directory. We don't yet have the ability to pass
+            var rootNamespace = options.RootNamespace;
-            // the namespace through from the project.
+            if (string.IsNullOrEmpty(rootNamespace))
-            var trimLength = relativePath.Length + (relativePath.StartsWith("/") ? 0 : 1);
-            var baseDirectory = filePath.Substring(0, filePath.Length - trimLength);
-
-            var lastSlash = baseDirectory.LastIndexOfAny(PathSeparators);
-            var baseNamespace = lastSlash == -1 ? baseDirectory : baseDirectory.Substring(lastSlash + 1);
-            if (string.IsNullOrEmpty(baseNamespace))
             {
                 @namespace = null;
                 @class = null;
@@ -151,7 +151,7 @@ namespace Microsoft.AspNetCore.Razor.Language.Components
             var builder = new StringBuilder();
 
             // Sanitize the base namespace, but leave the dots.
-            var segments = baseNamespace.Split(NamespaceSeparators, StringSplitOptions.RemoveEmptyEntries);
+            var segments = rootNamespace.Split(NamespaceSeparators, StringSplitOptions.RemoveEmptyEntries);
             builder.Append(CSharpIdentifier.SanitizeIdentifier(segments[0]));
             for (var i = 1; i < segments.Length; i++)
             {

src/Razor/Microsoft.AspNetCore.Razor.Language/src/DefaultRazorCodeGenerationOptions.cs

@@ -9,6 +9,7 @@ namespace Microsoft.AspNetCore.Razor.Language
             bool indentWithTabs, 
             int indentSize, 
             bool designTime,
+            string rootNamespace,
             bool suppressChecksum,
             bool supressMetadataAttributes,
             bool suppressPrimaryMethodBody)
@@ -16,6 +17,7 @@ namespace Microsoft.AspNetCore.Razor.Language
             IndentWithTabs = indentWithTabs;
             IndentSize = indentSize;
             DesignTime = designTime;
+            RootNamespace = rootNamespace;
             SuppressChecksum = suppressChecksum;
             SuppressMetadataAttributes = supressMetadataAttributes;
             SuppressPrimaryMethodBody = suppressPrimaryMethodBody;
@@ -27,6 +29,8 @@ namespace Microsoft.AspNetCore.Razor.Language
 
         public override int IndentSize { get; }
 
+        public override string RootNamespace { get; }
+
         public override bool SuppressChecksum { get; }
     }
 }

src/Razor/Microsoft.AspNetCore.Razor.Language/src/DefaultRazorCodeGenerationOptionsBuilder.cs

@@ -43,6 +43,7 @@ namespace Microsoft.AspNetCore.Razor.Language
                 IndentWithTabs,
                 IndentSize,
                 DesignTime,
+                RootNamespace,
                 SuppressChecksum,
                 SuppressMetadataAttributes,
                 SuppressPrimaryMethodBody);

src/Razor/Microsoft.AspNetCore.Razor.Language/src/RazorCodeGenerationOptions.cs

@@ -14,6 +14,7 @@ namespace Microsoft.AspNetCore.Razor.Language
                 indentSize: 4,
                 designTime: false,
                 suppressChecksum: false,
+                rootNamespace: null,
                 supressMetadataAttributes: false,
                 suppressPrimaryMethodBody: false);
         }
@@ -24,6 +25,7 @@ namespace Microsoft.AspNetCore.Razor.Language
                 indentWithTabs: false,
                 indentSize: 4,
                 designTime: true,
+                rootNamespace: null,
                 suppressChecksum: false,
                 supressMetadataAttributes: true,
                 suppressPrimaryMethodBody: false);
@@ -67,6 +69,11 @@ namespace Microsoft.AspNetCore.Razor.Language
 
         public abstract int IndentSize { get; }
 
+        /// <summary>
+        /// Gets the root namespace for the generated code.
+        /// </summary>
+        public virtual string RootNamespace { get; }
+
         /// <summary>
         /// Gets a value that indicates whether to suppress the default <c>#pragma checksum</c> directive in the 
         /// generated C# code. If <c>false</c> the checkum directive will be included, otherwise it will not be

src/Razor/Microsoft.AspNetCore.Razor.Language/src/RazorCodeGenerationOptionsBuilder.cs

@@ -15,6 +15,11 @@ namespace Microsoft.AspNetCore.Razor.Language
 
         public abstract bool IndentWithTabs { get; set; }
 
+        /// <summary>
+        /// Gets or sets the root namespace of the generated code.
+        /// </summary>
+        public virtual string RootNamespace { get; set; }
+
         /// <summary>
         /// Gets or sets a value that indicates whether to suppress the default <c>#pragma checksum</c> directive in the 
         /// generated C# code. If <c>false</c> the checkum directive will be included, otherwise it will not be

src/Razor/Microsoft.AspNetCore.Razor.Language/src/RazorProjectEngineBuilderExtensions.cs

@@ -75,6 +75,23 @@ namespace Microsoft.AspNetCore.Razor.Language
             return builder;
         }
 
+        /// <summary>
+        /// Sets the root namespace for the generated code.
+        /// </summary>
+        /// <param name="builder">The <see cref="RazorProjectEngineBuilder"/>.</param>
+        /// <param name="rootNamespace">The root namespace.</param>
+        /// <returns>The <see cref="RazorProjectEngineBuilder"/>.</returns>
+        public static RazorProjectEngineBuilder SetRootNamespace(this RazorProjectEngineBuilder builder, string rootNamespace)
+        {
+            if (builder == null)
+            {
+                throw new ArgumentNullException(nameof(builder));
+            }
+
+            builder.Features.Add(new ConfigureRootNamespaceFeature(rootNamespace));
+            return builder;
+        }
+
         public static void SetImportFeature(this RazorProjectEngineBuilder builder, IImportProjectFeature feature)
         {
             if (builder == null)
@@ -281,5 +298,29 @@ namespace Microsoft.AspNetCore.Razor.Language
                 public override Stream Read() => new MemoryStream(_importBytes);
             }
         }
+
+        private class ConfigureRootNamespaceFeature : IConfigureRazorCodeGenerationOptionsFeature
+        {
+            private readonly string _rootNamespace;
+
+            public ConfigureRootNamespaceFeature(string rootNamespace)
+            {
+                _rootNamespace = rootNamespace;
+            }
+
+            public int Order { get; set; }
+
+            public RazorEngine Engine { get; set; }
+
+            public void Configure(RazorCodeGenerationOptionsBuilder options)
+            {
+                if (options == null)
+                {
+                    throw new ArgumentNullException(nameof(options));
+                }
+
+                options.RootNamespace = _rootNamespace;
+            }
+        }
     }
 }

src/Razor/Microsoft.AspNetCore.Razor.Tools/src/GenerateCommand.cs

@@ -29,6 +29,7 @@ namespace Microsoft.AspNetCore.Razor.Tools
             Configuration = Option("-c", "Razor configuration name", CommandOptionType.SingleValue);
             ExtensionNames = Option("-n", "extension name", CommandOptionType.MultipleValue);
             ExtensionFilePaths = Option("-e", "extension file path", CommandOptionType.MultipleValue);
+            RootNamespace = Option("--root-namespace", "root namespace for generated code", CommandOptionType.SingleValue);
             GenerateDeclaration = Option("--generate-declaration", "Generate declaration", CommandOptionType.NoValue);
         }
 
@@ -52,6 +53,8 @@ namespace Microsoft.AspNetCore.Razor.Tools
 
         public CommandOption ExtensionFilePaths { get; }
 
+        public CommandOption RootNamespace { get; }
+
         public CommandOption GenerateDeclaration { get; }
 
         protected override Task<int> ExecuteCoreAsync()
@@ -176,6 +179,11 @@ namespace Microsoft.AspNetCore.Razor.Tools
                 {
                     b.Features.Add(new SetSuppressPrimaryMethodBodyOptionFeature());
                 }
+
+                if (RootNamespace.HasValue())
+                {
+                    b.SetRootNamespace(RootNamespace.Value());
+                }
             });
 
             var results = GenerateCode(engine, sourceItems);

src/Razor/Microsoft.NET.Sdk.Razor/src/RazorGenerate.cs

@@ -24,6 +24,8 @@ namespace Microsoft.AspNetCore.Razor.Tasks
         private const string AssemblyName = "AssemblyName";
         private const string AssemblyFilePath = "AssemblyFilePath";
 
+        public string RootNamespace { get; set; }
+
         [Required]
         public string Version { get; set; }
 
@@ -135,6 +137,13 @@ namespace Microsoft.AspNetCore.Razor.Tasks
             builder.AppendLine("-c");
             builder.AppendLine(Configuration[0].GetMetadata(Identity));
 
+            // Added in 3.0
+            if (parsedVersion.Major >= 3 && !string.IsNullOrEmpty(RootNamespace))
+            {
+                builder.AppendLine("--root-namespace");
+                builder.AppendLine(RootNamespace);
+            }
+
             // Added in 3.0
             if (parsedVersion.Major >= 3 && GenerateDeclaration)
             {

src/Razor/Microsoft.NET.Sdk.Razor/src/build/netstandard2.0/Microsoft.NET.Sdk.Razor.CodeGeneration.targets

@@ -155,6 +155,7 @@ Copyright (c) .NET Foundation. All rights reserved.
       ForceServer="$(_RazorForceBuildServer)"
       PipeName="$(_RazorBuildServerPipeName)"
       Version="$(RazorLangVersion)"
+      RootNamespace="$(RootNamespace)"
       Configuration="@(ResolvedRazorConfiguration)"
       Extensions="@(ResolvedRazorExtension)"
       Sources="@(RazorGenerateWithTargetPath)"

src/Razor/Microsoft.NET.Sdk.Razor/src/build/netstandard2.0/Microsoft.NET.Sdk.Razor.Component.targets

@@ -98,6 +98,7 @@ Copyright (c) .NET Foundation. All rights reserved.
       ForceServer="$(_RazorForceBuildServer)"
       PipeName="$(_RazorBuildServerPipeName)"
       Version="$(RazorLangVersion)"
+      RootNamespace="$(RootNamespace)"
       Configuration="@(ResolvedRazorConfiguration)"
       Extensions="@(ResolvedRazorExtension)"
       Sources="@(_RazorComponentDeclarationSources)"

src/Razor/test/Microsoft.AspNetCore.Razor.Test.Common/Language/IntegrationTests/RazorIntegrationTestBase.cs

@@ -66,7 +66,7 @@ namespace Microsoft.AspNetCore.Razor.Language.IntegrationTests
             PathSeparator = Path.DirectorySeparatorChar.ToString();
             WorkingDirectory = RuntimeInformation.IsOSPlatform(OSPlatform.Windows) ? ArbitraryWindowsPath : ArbitraryMacLinuxPath;
 
-            DefaultBaseNamespace = "Test"; // Matches the default working directory
+            DefaultRootNamespace = "Test"; // Matches the default working directory
             DefaultFileName = "TestComponent.cshtml";
         }
 
@@ -78,7 +78,7 @@ namespace Microsoft.AspNetCore.Razor.Language.IntegrationTests
 
         internal virtual RazorConfiguration Configuration { get; }
 
-        internal virtual string DefaultBaseNamespace { get; }
+        internal virtual string DefaultRootNamespace { get; }
 
         internal virtual string DefaultFileName { get; }
 
@@ -113,6 +113,8 @@ namespace Microsoft.AspNetCore.Razor.Language.IntegrationTests
         {
             return RazorProjectEngine.Create(configuration, FileSystem, b =>
             {
+                b.SetRootNamespace(DefaultRootNamespace);
+
                 // Turn off checksums, we're testing code generation.
                 b.Features.Add(new SuppressChecksum());
 
@@ -320,7 +322,7 @@ namespace Microsoft.AspNetCore.Razor.Language.IntegrationTests
         {
             var assemblyResult = CompileToAssembly(DefaultFileName, cshtmlSource);
 
-            var componentFullTypeName = $"{DefaultBaseNamespace}.{Path.GetFileNameWithoutExtension(DefaultFileName)}";
+            var componentFullTypeName = $"{DefaultRootNamespace}.{Path.GetFileNameWithoutExtension(DefaultFileName)}";
             return CompileToComponent(assemblyResult, componentFullTypeName);
         }