Refactored CodeGeneratorContext to CodeBuilderContext.

- Needed to separate the context's of "generation" and "building" to enable the communication of the TagHelperProvider.

src/Microsoft.AspNet.Razor/CSharpRazorCodeLanguage.cs

@@ -42,7 +42,7 @@ namespace Microsoft.AspNet.Razor
             return new CSharpRazorCodeGenerator(className, rootNamespaceName, sourceFileName, host);
         }
 
-        public override CodeBuilder CreateCodeBuilder(CodeGeneratorContext context)
+        public override CodeBuilder CreateCodeBuilder(CodeBuilderContext context)
         {
             return new CSharpCodeBuilder(context);
         }

src/Microsoft.AspNet.Razor/Generator/CodeBuilderContext.cs

@@ -0,0 +1,54 @@
+// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+namespace Microsoft.AspNet.Razor.Generator
+{
+    /// <summary>
+    /// Context object with information used to generate a Razor page.
+    /// </summary>
+    public class CodeBuilderContext : CodeGeneratorContext
+    {
+        /// <summary>
+        /// Instantiates a new instance of the <see cref="CodeBuilderContext"/> object.
+        /// </summary>
+        /// <param name="generatorContext">A <see cref="CodeGeneratorContext"/> to copy information from.</param>
+        public CodeBuilderContext(CodeGeneratorContext generatorContext)
+            : base(generatorContext)
+        {
+            ExpressionRenderingMode = ExpressionRenderingMode.WriteToOutput;
+        }
+
+        // Internal for testing.
+        internal CodeBuilderContext(RazorEngineHost host,
+                                    string className,
+                                    string rootNamespace,
+                                    string sourceFile,
+                                    bool shouldGenerateLinePragmas)
+            : base(host, className, rootNamespace, sourceFile, shouldGenerateLinePragmas)
+        {
+            ExpressionRenderingMode = ExpressionRenderingMode.WriteToOutput;
+        }
+
+        /// <summary>
+        /// The current C# rendering mode.
+        /// </summary>
+        /// <remarks>
+        /// <see cref="ExpressionRenderingMode.WriteToOutput"/> forces C# generation to write 
+        /// <see cref="Compiler.Chunk"/>s to the output page, i.e. WriteLiteral("Hello World").
+        /// <see cref="ExpressionRenderingMode.InjectCode"/> writes <see cref="Compiler.Chunk"/> values in their
+        /// rawest form, i.g. "Hello World".
+        /// </remarks>
+        public ExpressionRenderingMode ExpressionRenderingMode { get; set; }
+
+        /// <summary>
+        /// The C# writer to write <see cref="Compiler.Chunk"/> information to.
+        /// </summary>
+        /// <remarks>
+        /// If <see cref="TargetWriterName"/> is <c>null</c> values will be written using a default write method
+        /// i.e. WriteLiteral("Hello World").
+        /// If <see cref="TargetWriterName"/> is not <c>null</c> values will be written to the given 
+        /// <see cref="TargetWriterName"/>, i.e. WriteLiteralTo(myWriter, "Hello World").
+        /// </remarks>
+        public string TargetWriterName { get; set; }
+    }
+}

src/Microsoft.AspNet.Razor/Generator/CodeGeneratorContext.cs

@@ -7,37 +7,43 @@ namespace Microsoft.AspNet.Razor.Generator
 {
     public class CodeGeneratorContext
     {
-        private CodeGeneratorContext()
+        protected CodeGeneratorContext(CodeGeneratorContext context)
+            : this(context.Host,
+                   context.ClassName,
+                   context.RootNamespace,
+                   context.SourceFile,
+                   // True because we're pulling from the provided context's source file.
+                   shouldGenerateLinePragmas: true)
         {
-            ExpressionRenderingMode = ExpressionRenderingMode.WriteToOutput;
+            CodeTreeBuilder = context.CodeTreeBuilder;
+        }
+
+        public CodeGeneratorContext(RazorEngineHost host,
+                                    string className,
+                                    string rootNamespace,
+                                    string sourceFile,
+                                    bool shouldGenerateLinePragmas)
+        {
+            CodeTreeBuilder = new CodeTreeBuilder();
+            Host = host;
+            SourceFile = shouldGenerateLinePragmas ? sourceFile : null;
+            RootNamespace = rootNamespace;
+            ClassName = className;
         }
 
-        // Internal/Private state. Technically consumers might want to use some of these but they can implement them independently if necessary.
-        // It's way safer to make them internal for now, especially with the code generator stuff in a bit of flux.
-        internal ExpressionRenderingMode ExpressionRenderingMode { get; set; }
         public string SourceFile { get; internal set; }
+
         public string RootNamespace { get; private set; }
+
         public string ClassName { get; private set; }
+
         public RazorEngineHost Host { get; private set; }
-        public string TargetWriterName { get; set; }
 
         public CodeTreeBuilder CodeTreeBuilder { get; set; }
-
         /// <summary>
         /// Gets or sets the <c>SHA1</c> based checksum for the file whose location is defined by <see cref="SourceFile"/>.
         /// </summary>
         public string Checksum { get; set; }
 
-        public static CodeGeneratorContext Create(RazorEngineHost host, string className, string rootNamespace, string sourceFile, bool shouldGenerateLinePragmas)
-        {
-            return new CodeGeneratorContext()
-            {
-                CodeTreeBuilder = new CodeTreeBuilder(),
-                Host = host,
-                SourceFile = shouldGenerateLinePragmas ? sourceFile : null,
-                RootNamespace = rootNamespace,
-                ClassName = className
-            };
-        }
     }
 }

src/Microsoft.AspNet.Razor/Generator/Compiler/CodeBuilder/CSharp/CSharpCodeBuilder.cs

@@ -14,7 +14,7 @@ namespace Microsoft.AspNet.Razor.Generator.Compiler.CSharp
         private const string Sha1AlgorithmId = "{ff1816ec-aa5e-4d10-87f7-6f4963833460}";
         private const int DisableAsyncWarning = 1998;
 
-        public CSharpCodeBuilder(CodeGeneratorContext context)
+        public CSharpCodeBuilder(CodeBuilderContext context)
             : base(context)
         {
         }

src/Microsoft.AspNet.Razor/Generator/Compiler/CodeBuilder/CSharp/Visitors/CSharpBaseTypeVisitor.cs

@@ -5,7 +5,7 @@ namespace Microsoft.AspNet.Razor.Generator.Compiler.CSharp
 {
     public class CSharpBaseTypeVisitor : CodeVisitor<CSharpCodeWriter>
     {
-        public CSharpBaseTypeVisitor(CSharpCodeWriter writer, CodeGeneratorContext context)
+        public CSharpBaseTypeVisitor(CSharpCodeWriter writer, CodeBuilderContext context)
             : base(writer, context) { }
 
         public string CurrentBaseType { get; set; }

src/Microsoft.AspNet.Razor/Generator/Compiler/CodeBuilder/CSharp/Visitors/CSharpClassAttributeVisitor.cs

@@ -7,7 +7,7 @@ namespace Microsoft.AspNet.Razor.Generator.Compiler.CSharp
 {
     public class CSharpClassAttributeVisitor : CodeVisitor<CSharpCodeWriter>
     {
-        public CSharpClassAttributeVisitor(CSharpCodeWriter writer, CodeGeneratorContext context)
+        public CSharpClassAttributeVisitor(CSharpCodeWriter writer, CodeBuilderContext context)
             : base(writer, context) { }
 
         protected override void Visit(SessionStateChunk chunk)

src/Microsoft.AspNet.Razor/Generator/Compiler/CodeBuilder/CSharp/Visitors/CSharpCodeVisitor.cs

@@ -17,7 +17,7 @@ namespace Microsoft.AspNet.Razor.Generator.Compiler.CSharp
 
         private CSharpPaddingBuilder _paddingBuilder;
 
-        public CSharpCodeVisitor(CSharpCodeWriter writer, CodeGeneratorContext context)
+        public CSharpCodeVisitor(CSharpCodeWriter writer, CodeBuilderContext context)
             : base(writer, context)
         {
             _paddingBuilder = new CSharpPaddingBuilder(context.Host);

src/Microsoft.AspNet.Razor/Generator/Compiler/CodeBuilder/CSharp/Visitors/CSharpDesignTimeHelpersVisitor.cs

@@ -10,7 +10,7 @@ namespace Microsoft.AspNet.Razor.Generator.Compiler.CSharp
 
         private const int DisableVariableNamingWarnings = 219;
 
-        public CSharpDesignTimeHelpersVisitor(CSharpCodeWriter writer, CodeGeneratorContext context)
+        public CSharpDesignTimeHelpersVisitor(CSharpCodeWriter writer, CodeBuilderContext context)
             : base(writer, context) { }
 
         public void AcceptTree(CodeTree tree)

src/Microsoft.AspNet.Razor/Generator/Compiler/CodeBuilder/CSharp/Visitors/CSharpHelperVisitor.cs

@@ -11,7 +11,7 @@ namespace Microsoft.AspNet.Razor.Generator.Compiler.CSharp
 
         private CSharpCodeVisitor _codeVisitor;
 
-        public CSharpHelperVisitor(CSharpCodeWriter writer, CodeGeneratorContext context)
+        public CSharpHelperVisitor(CSharpCodeWriter writer, CodeBuilderContext context)
             : base(writer, context)
         {
             _codeVisitor = new CSharpCodeVisitor(writer, context);

src/Microsoft.AspNet.Razor/Generator/Compiler/CodeBuilder/CSharp/Visitors/CSharpTypeMemberVisitor.cs

@@ -9,7 +9,7 @@ namespace Microsoft.AspNet.Razor.Generator.Compiler.CSharp
     {
         private CSharpCodeVisitor _csharpCodeVisitor;
 
-        public CSharpTypeMemberVisitor(CSharpCodeWriter writer, CodeGeneratorContext context)
+        public CSharpTypeMemberVisitor(CSharpCodeWriter writer, CodeBuilderContext context)
             : base(writer, context)
         {
             _csharpCodeVisitor = new CSharpCodeVisitor(writer, context);

src/Microsoft.AspNet.Razor/Generator/Compiler/CodeBuilder/CSharp/Visitors/CSharpUsingVisitor.cs

@@ -9,7 +9,7 @@ namespace Microsoft.AspNet.Razor.Generator.Compiler.CSharp
 {
     public class CSharpUsingVisitor : CodeVisitor<CSharpCodeWriter>
     {
-        public CSharpUsingVisitor(CSharpCodeWriter writer, CodeGeneratorContext context)
+        public CSharpUsingVisitor(CSharpCodeWriter writer, CodeBuilderContext context)
             : base(writer, context)
         {
             ImportedUsings = new List<string>();

src/Microsoft.AspNet.Razor/Generator/Compiler/CodeBuilder/ChunkVisitor.cs

@@ -8,14 +8,14 @@ namespace Microsoft.AspNet.Razor.Generator.Compiler
 {
     public abstract class ChunkVisitor<T> : IChunkVisitor where T : CodeWriter
     {
-        public ChunkVisitor(T writer, CodeGeneratorContext context)
+        public ChunkVisitor(T writer, CodeBuilderContext context)
         {
             Writer = writer;
             Context = context;
         }
 
         protected T Writer { get; private set; }
-        protected CodeGeneratorContext Context { get; private set; }
+        protected CodeBuilderContext Context { get; private set; }
 
         public void Accept(IList<Chunk> chunks)
         {

src/Microsoft.AspNet.Razor/Generator/Compiler/CodeBuilder/CodeBuilder.cs

@@ -5,14 +5,14 @@ namespace Microsoft.AspNet.Razor.Generator.Compiler
 {
     public abstract class CodeBuilder
     {
-        private readonly CodeGeneratorContext _context;
+        private readonly CodeBuilderContext _context;
 
-        public CodeBuilder(CodeGeneratorContext context)
+        public CodeBuilder(CodeBuilderContext context)
         {
             _context = context;
         }
 
-        protected CodeGeneratorContext Context
+        protected CodeBuilderContext Context
         {
             get { return _context; }
         }

src/Microsoft.AspNet.Razor/Generator/Compiler/CodeBuilder/CodeVisitor.cs

@@ -5,7 +5,7 @@ namespace Microsoft.AspNet.Razor.Generator.Compiler
 {
     public class CodeVisitor<T> : ChunkVisitor<T> where T : CodeWriter
     {
-        public CodeVisitor(T writer, CodeGeneratorContext context)
+        public CodeVisitor(T writer, CodeBuilderContext context)
             : base(writer, context) { }
 
         protected override void Visit(LiteralChunk chunk)

src/Microsoft.AspNet.Razor/Generator/RazorCodeGenerator.cs

@@ -71,7 +71,11 @@ namespace Microsoft.AspNet.Razor.Generator
         {
             if (_context == null)
             {
-                _context = CodeGeneratorContext.Create(Host, ClassName, RootNamespaceName, SourceFileName, GenerateLinePragmas);
+                _context = new CodeGeneratorContext(Host, 
+                                                    ClassName, 
+                                                    RootNamespaceName, 
+                                                    SourceFileName, 
+                                                    GenerateLinePragmas);
                 Initialize(_context);
             }
         }

src/Microsoft.AspNet.Razor/GeneratorResults.cs

@@ -9,9 +9,10 @@ namespace Microsoft.AspNet.Razor
 {
     public class GeneratorResults : ParserResults
     {
-        public GeneratorResults(ParserResults parserResults,
-                        CodeBuilderResult codeBuilderResult)
-            : this(parserResults.Document, parserResults.ParserErrors, codeBuilderResult)
+        public GeneratorResults(ParserResults parserResults, CodeBuilderResult codeBuilderResult)
+            : this(parserResults.Document, 
+                   parserResults.ParserErrors, 
+                   codeBuilderResult)
         {
         }
 
@@ -33,6 +34,7 @@ namespace Microsoft.AspNet.Razor
         }
 
         public string GeneratedCode { get; private set; }
+
         public IList<LineMapping> DesignTimeLineMappings { get; private set; }
     }
 }

src/Microsoft.AspNet.Razor/RazorCodeLanguage.cs

@@ -54,6 +54,6 @@ namespace Microsoft.AspNet.Razor
         /// </summary>
         public abstract RazorCodeGenerator CreateCodeGenerator(string className, string rootNamespaceName, string sourceFileName, RazorEngineHost host);
 
-        public abstract CodeBuilder CreateCodeBuilder(CodeGeneratorContext codeGeneratorContext);
+        public abstract CodeBuilder CreateCodeBuilder(CodeBuilderContext codeGeneratorContext);
     }
 }

src/Microsoft.AspNet.Razor/RazorEngineHost.cs

@@ -207,7 +207,7 @@ namespace Microsoft.AspNet.Razor
         /// </summary>
         /// <param name="incomingBuilder">The code builder</param>
         /// <returns>Either the same code builder, after modifications, or a different code builder.</returns>
-        public virtual CodeBuilder DecorateCodeBuilder(CodeBuilder incomingBuilder, CodeGeneratorContext context)
+        public virtual CodeBuilder DecorateCodeBuilder(CodeBuilder incomingBuilder, CodeBuilderContext context)
         {
             if (incomingBuilder == null)
             {

src/Microsoft.AspNet.Razor/RazorTemplateEngine.cs

@@ -252,8 +252,8 @@ namespace Microsoft.AspNet.Razor
             generator.DesignTimeMode = Host.DesignTimeMode;
             generator.Visit(results);
 
-
-            var codeGenerationContext = generator.Context;
+            var codeBuilderContext = new CodeBuilderContext(generator.Context);
+            var builder = CreateCodeBuilder(codeBuilderContext);
             codeGenerationContext.Checksum = checksum;
 
             var builder = CreateCodeBuilder(codeGenerationContext);
@@ -281,7 +281,7 @@ namespace Microsoft.AspNet.Razor
             };
         }
 
-        protected internal virtual CodeBuilder CreateCodeBuilder(CodeGeneratorContext context)
+        protected internal virtual CodeBuilder CreateCodeBuilder(CodeBuilderContext context)
         {
             return Host.DecorateCodeBuilder(Host.CodeLanguage.CreateCodeBuilder(context),
                                             context);

test/Microsoft.AspNet.Razor.Test/CSharpRazorCodeLanguageTest.cs

@@ -48,15 +48,16 @@ namespace Microsoft.AspNet.Razor.Test
         {
             // Arrange
             var language = new CSharpRazorCodeLanguage();
-            var host = new RazorEngineHost(language);
-            var context = CodeGeneratorContext.Create(host,
-                                                      "myclass",
-                                                      "myns",
-                                                      string.Empty,
-                                                      shouldGenerateLinePragmas: false);
+            var host = new RazorEngineHost(language);            
+            var codeBuilderContext = new CodeBuilderContext(
+                host,
+                "myclass",
+                "myns",
+                string.Empty,
+                shouldGenerateLinePragmas: false);
 
             // Act
-            var generator = language.CreateCodeBuilder(context);
+            var generator = language.CreateCodeBuilder(codeBuilderContext);
 
             // Assert
             Assert.IsType<CSharpCodeBuilder>(generator);

test/Microsoft.AspNet.Razor.Test/Generator/CodeTree/CSharpCodeBuilderTests.cs

@@ -17,15 +17,22 @@ namespace Microsoft.AspNet.Razor.Test.Generator.CodeTree
             var syntaxTreeNode = new Mock<Span>(new SpanBuilder());
             var language = new CSharpRazorCodeLanguage();
             var host = new RazorEngineHost(language);
-            var context = CodeGeneratorContext.Create(host, "TestClass", "TestNamespace", "Foo.cs", shouldGenerateLinePragmas: false);
-            context.CodeTreeBuilder.AddUsingChunk("FakeNamespace1", syntaxTreeNode.Object);
-            context.CodeTreeBuilder.AddUsingChunk("FakeNamespace2.SubNamespace", syntaxTreeNode.Object);
-            var codeBuilder = language.CreateCodeBuilder(context);
+            var codeBuilderContext = new CodeBuilderContext(
+                host,
+                "TestClass",
+                "TestNamespace",
+                "Foo.cs",
+                shouldGenerateLinePragmas: false);
+            codeBuilderContext.CodeTreeBuilder.AddUsingChunk("FakeNamespace1", syntaxTreeNode.Object);
+            codeBuilderContext.CodeTreeBuilder.AddUsingChunk("FakeNamespace2.SubNamespace", syntaxTreeNode.Object);
+            var codeBuilder = language.CreateCodeBuilder(codeBuilderContext);
 
             // Act
             var result = codeBuilder.Build();
 
-            BaselineWriter.WriteBaseline(@"test\Microsoft.AspNet.Razor.Test\TestFiles\CodeGenerator\CS\Output\CSharpCodeBuilder.cs", result.Code);
+            BaselineWriter.WriteBaseline(
+                @"test\Microsoft.AspNet.Razor.Test\TestFiles\CodeGenerator\CS\Output\CSharpCodeBuilder.cs", 
+                result.Code);
 
             var expectedOutput = TestFile.Create("TestFiles/CodeGenerator/CS/Output/CSharpCodeBuilder.cs").ReadAllText();
 

test/Microsoft.AspNet.Razor.Test/Generator/CodeTree/ChunkVisitorTests.cs

@@ -25,13 +25,14 @@ namespace Microsoft.AspNet.Razor
 
         private static Mock<ChunkVisitor<CodeWriter>> CreateVisitor()
         {
-            var context = CodeGeneratorContext.Create(new RazorEngineHost(new CSharpRazorCodeLanguage()),
-                                                      "myclass",
-                                                      "myns",
-                                                      string.Empty,
-                                                      shouldGenerateLinePragmas: false);
+            var codeBuilderContext = new CodeBuilderContext(
+                new RazorEngineHost(new CSharpRazorCodeLanguage()),
+                "myclass",
+                "myns",
+                string.Empty,
+                shouldGenerateLinePragmas: false);
             var writer = Mock.Of<CodeWriter>();
-            return new Mock<ChunkVisitor<CodeWriter>>(writer, context);
+            return new Mock<ChunkVisitor<CodeWriter>>(writer, codeBuilderContext);
         }
 
         private class MyTestChunk : Chunk

test/Microsoft.AspNet.Razor.Test/RazorTemplateEngineTest.cs

@@ -114,19 +114,21 @@ namespace Microsoft.AspNet.Razor.Test
         {
             // Arrange
             var mockHost = new Mock<RazorEngineHost>(new CSharpRazorCodeLanguage()) { CallBase = true };
-            var context = CodeGeneratorContext.Create(mockHost.Object,
-                                                      "different-class",
-                                                      "different-ns",
-                                                      string.Empty,
-                                                      shouldGenerateLinePragmas: true);
-            var expected = new CSharpCodeBuilder(context);
+            var codeBuilderContext = new CodeBuilderContext(
+                mockHost.Object,
+                "different-class",
+                "different-ns",
+                string.Empty,
+                shouldGenerateLinePragmas: true);
 
-            mockHost.Setup(h => h.DecorateCodeBuilder(It.IsAny<CSharpCodeBuilder>(), context))
+            var expected = new CSharpCodeBuilder(codeBuilderContext);
+
+            mockHost.Setup(h => h.DecorateCodeBuilder(It.IsAny<CSharpCodeBuilder>(), codeBuilderContext))
                     .Returns(expected);
             var engine = new RazorTemplateEngine(mockHost.Object);
 
             // Act
-            var actual = engine.CreateCodeBuilder(context);
+            var actual = engine.CreateCodeBuilder(codeBuilderContext);
 
             // Assert
             Assert.Equal(expected, actual);