From 4812929127e01d54b7e23de38fb3033657e88a83 Mon Sep 17 00:00:00 2001
From: Ajay Bhargav Baaskaran <ajbaaska@microsoft.com>
Date: Tue, 19 Jun 2018 12:30:27 -0700
Subject: [PATCH] Added benchmarks for syntax tree generation

---
 .../SyntaxTreeGenerationBenckmark.cs          | 77 +++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100644 benchmarks/Microsoft.AspNetCore.Razor.Performance/SyntaxTreeGenerationBenckmark.cs

diff --git a/benchmarks/Microsoft.AspNetCore.Razor.Performance/SyntaxTreeGenerationBenckmark.cs b/benchmarks/Microsoft.AspNetCore.Razor.Performance/SyntaxTreeGenerationBenckmark.cs
new file mode 100644
index 0000000000..d1ec9a0a55
--- /dev/null
+++ b/benchmarks/Microsoft.AspNetCore.Razor.Performance/SyntaxTreeGenerationBenckmark.cs
@@ -0,0 +1,77 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System;
+using System.IO;
+using System.Linq;
+using BenchmarkDotNet.Attributes;
+using Microsoft.AspNetCore.Mvc.Razor.Extensions;
+using Microsoft.AspNetCore.Razor.Language;
+
+namespace Microsoft.AspNetCore.Razor.Performance
+{
+    public class SyntaxTreeGenerationBenchmark
+    {
+        public SyntaxTreeGenerationBenchmark()
+        {
+            var current = new DirectoryInfo(AppContext.BaseDirectory);
+            while (current != null && !File.Exists(Path.Combine(current.FullName, "MSN.cshtml")))
+            {
+                current = current.Parent;
+            }
+
+            var root = current;
+            var fileSystem = RazorProjectFileSystem.Create(root.FullName);
+
+            ProjectEngine = RazorProjectEngine.Create(RazorConfiguration.Default, fileSystem, b => RazorExtensions.Register(b)); ;
+
+            var projectItem = fileSystem.GetItem(Path.Combine(root.FullName, "MSN.cshtml"));
+            MSN = RazorSourceDocument.ReadFrom(projectItem);
+
+            var directiveFeature = ProjectEngine.EngineFeatures.OfType<IRazorDirectiveFeature>().FirstOrDefault();
+            Directives = directiveFeature?.Directives.ToArray() ?? Array.Empty<DirectiveDescriptor>();
+        }
+
+        public RazorProjectEngine ProjectEngine { get; }
+
+        public RazorSourceDocument MSN { get; }
+
+        public DirectiveDescriptor[] Directives { get; }
+
+        [Benchmark(Description = "Razor Design Time Syntax Tree Generation of MSN.com")]
+        public void SyntaxTreeGeneration_DesignTime_LargeStaticFile()
+        {
+            var options = RazorParserOptions.CreateDesignTime(o =>
+            {
+                foreach (var directive in Directives)
+                {
+                    o.Directives.Add(directive);
+                }
+            });
+            var syntaxTree = RazorSyntaxTree.Parse(MSN, options);
+
+            if (syntaxTree.Diagnostics.Count != 0)
+            {
+                throw new Exception("Error!" + Environment.NewLine + string.Join(Environment.NewLine, syntaxTree.Diagnostics));
+            }
+        }
+
+        [Benchmark(Description = "Razor Runtime Syntax Tree Generation of MSN.com")]
+        public void SyntaxTreeGeneration_Runtime_LargeStaticFile()
+        {
+            var options = RazorParserOptions.Create(o =>
+            {
+                foreach (var directive in Directives)
+                {
+                    o.Directives.Add(directive);
+                }
+            });
+            var syntaxTree = RazorSyntaxTree.Parse(MSN, options);
+
+            if (syntaxTree.Diagnostics.Count != 0)
+            {
+                throw new Exception("Error!" + Environment.NewLine + string.Join(Environment.NewLine, syntaxTree.Diagnostics));
+            }
+        }
+    }
+}