HTML Parsing Extension for preview pane markdown renderer (microsoft#…

…1108) * Added Extension for html post processing * Added unit test poroject for preview pane * Added pipline test and base test function * Added Tests for extension * Added tests for url slashes * Added tests for url and figure caption
udit3333 · Feb 19, 2020 · 201d1f1 · 201d1f1
1 parent 9c5372b
commit 201d1f1
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Showing 9 changed files with 428 additions and 5 deletions.
diff --git a/PowerToys.sln b/PowerToys.sln
@@ -88,7 +88,11 @@ Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "PowerRenameUWPUI", "src\mod
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "previewpane", "previewpane", "{2F305555-C296-497E-AC20-5FA1B237996A}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Common", "src\modules\previewpane\common\Common.csproj", "{AF2349B8-E5B6-4004-9502-687C1C7730B1}"
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Common", "src\modules\previewpane\Common\Common.csproj", "{AF2349B8-E5B6-4004-9502-687C1C7730B1}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "MarkDownPreviewHandler", "src\modules\previewpane\MarkDownPreviewHandler\MarkDownPreviewHandler.csproj", "{6A71162E-FC4C-4A2C-B90F-3CF94F59A9BB}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "PreviewPaneUnitTests", "src\modules\previewpane\PreviewPaneUnitTests\PreviewPaneUnitTests.csproj", "{A2B51B8B-8F90-424E-BC97-F9AB7D76CA1A}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
@@ -168,6 +172,14 @@ Global
 		{AF2349B8-E5B6-4004-9502-687C1C7730B1}.Debug|x64.Build.0 = Debug|x64
 		{AF2349B8-E5B6-4004-9502-687C1C7730B1}.Release|x64.ActiveCfg = Release|x64
 		{AF2349B8-E5B6-4004-9502-687C1C7730B1}.Release|x64.Build.0 = Release|x64
+		{6A71162E-FC4C-4A2C-B90F-3CF94F59A9BB}.Debug|x64.ActiveCfg = Debug|x64
+		{6A71162E-FC4C-4A2C-B90F-3CF94F59A9BB}.Debug|x64.Build.0 = Debug|x64
+		{6A71162E-FC4C-4A2C-B90F-3CF94F59A9BB}.Release|x64.ActiveCfg = Release|x64
+		{6A71162E-FC4C-4A2C-B90F-3CF94F59A9BB}.Release|x64.Build.0 = Release|x64
+		{A2B51B8B-8F90-424E-BC97-F9AB7D76CA1A}.Debug|x64.ActiveCfg = Debug|x64
+		{A2B51B8B-8F90-424E-BC97-F9AB7D76CA1A}.Debug|x64.Build.0 = Debug|x64
+		{A2B51B8B-8F90-424E-BC97-F9AB7D76CA1A}.Release|x64.ActiveCfg = Release|x64
+		{A2B51B8B-8F90-424E-BC97-F9AB7D76CA1A}.Release|x64.Build.0 = Release|x64
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -193,6 +205,8 @@ Global
 		{0485F45C-EA7A-4BB5-804B-3E8D14699387} = {89E20BCE-EB9C-46C8-8B50-E01A82E6FDC3}
 		{2F305555-C296-497E-AC20-5FA1B237996A} = {4574FDD0-F61D-4376-98BF-E5A1262C11EC}
 		{AF2349B8-E5B6-4004-9502-687C1C7730B1} = {2F305555-C296-497E-AC20-5FA1B237996A}
+		{6A71162E-FC4C-4A2C-B90F-3CF94F59A9BB} = {2F305555-C296-497E-AC20-5FA1B237996A}
+		{A2B51B8B-8F90-424E-BC97-F9AB7D76CA1A} = {2F305555-C296-497E-AC20-5FA1B237996A}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {C3A2F9D1-7930-4EF4-A6FC-7EE0A99821D0}

diff --git a/src/modules/previewpane/MarkDownPreviewHandler/HTMLParsingExtension.cs b/src/modules/previewpane/MarkDownPreviewHandler/HTMLParsingExtension.cs
@@ -0,0 +1,93 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.IO;
+using Markdig;
+using Markdig.Extensions.Figures;
+using Markdig.Extensions.Tables;
+using Markdig.Renderers;
+using Markdig.Renderers.Html;
+using Markdig.Syntax;
+using Markdig.Syntax.Inlines;
+
+namespace MarkDownPreviewHandler
+{
+    /// <summary>
+    /// Markdig Extension to process html nodes in markdown AST.
+    /// </summary>
+    internal class HTMLParsingExtension : IMarkdownExtension
+    {
+        /// <summary>
+        /// Initializes a new instance of the <see cref="HTMLParsingExtension"/> class.
+        /// </summary>
+        public HTMLParsingExtension(string baseUrl = "")
+        {
+            this.BaseUrl = baseUrl;
+        }
+
+        /// <summary>
+        /// Gets or sets path to directory containing markdown file.
+        /// </summary>
+        public string BaseUrl { get; set; }
+
+        /// <inheritdoc/>
+        public void Setup(MarkdownPipelineBuilder pipeline)
+        {
+            // Make sure we don't have a delegate twice
+            pipeline.DocumentProcessed -= this.PipelineOnDocumentProcessed;
+            pipeline.DocumentProcessed += this.PipelineOnDocumentProcessed;
+        }
+
+        /// <inheritdoc/>
+        public void Setup(MarkdownPipeline pipeline, IMarkdownRenderer renderer)
+        {
+        }
+
+        /// <summary>
+        /// Process nodes in markdown AST.
+        /// </summary>
+        /// <param name="document">Markdown Document.</param>
+        public void PipelineOnDocumentProcessed(MarkdownDocument document)
+        {
+            foreach (var node in document.Descendants())
+            {
+                if (node is Block)
+                {
+                    if (node is Table)
+                    {
+                        node.GetAttributes().AddClass("table table-striped table-bordered");
+                    }
+                    else if (node is QuoteBlock)
+                    {
+                        node.GetAttributes().AddClass("blockquote");
+                    }
+                    else if (node is Figure)
+                    {
+                        node.GetAttributes().AddClass("figure");
+                    }
+                    else if (node is FigureCaption)
+                    {
+                        node.GetAttributes().AddClass("figure-caption");
+                    }
+                }
+                else if (node is Inline)
+                {
+                    if (node is LinkInline link && link.IsImage)
+                    {
+                        if (!Uri.TryCreate(link.Url, UriKind.Absolute, out Uri uriLink))
+                        {
+                            link.Url = link.Url.TrimStart('/', '\\');
+                            this.BaseUrl = this.BaseUrl.TrimEnd('/', '\\');
+                            uriLink = new Uri(Path.Combine(this.BaseUrl, link.Url));
+                            link.Url = uriLink.ToString();
+                        }
+
+                        link.GetAttributes().AddClass("img-fluid");
+                    }
+                }
+            }
+        }
+    }
+}
diff --git a/src/modules/previewpane/MarkDownPreviewHandler/MarkDownPreviewHandler.csproj b/src/modules/previewpane/MarkDownPreviewHandler/MarkDownPreviewHandler.csproj
@@ -0,0 +1,75 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{6A71162E-FC4C-4A2C-B90F-3CF94F59A9BB}</ProjectGuid>
+    <OutputType>Library</OutputType>
+    <AppDesignerFolder>Properties</AppDesignerFolder>
+    <RootNamespace>MarkDownPreviewHandler</RootNamespace>
+    <AssemblyName>MarkDownPreviewHandler</AssemblyName>
+    <TargetFrameworkVersion>v4.8</TargetFrameworkVersion>
+    <FileAlignment>512</FileAlignment>
+    <Deterministic>true</Deterministic>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|x64' ">
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
+    <DocumentationFile>bin/Debug/MarkdownPreviewPaneDocumentation.xml</DocumentationFile>
+    <PlatformTarget>x64</PlatformTarget>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|x64' ">
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
+    <DocumentationFile>bin/Release/commonDocumentation.xml</DocumentationFile>
+    <PlatformTarget>x64</PlatformTarget>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="System" />
+    <Reference Include="System.Core" />
+    <Reference Include="System.Xml.Linq" />
+    <Reference Include="System.Data.DataSetExtensions" />
+    <Reference Include="Microsoft.CSharp" />
+    <Reference Include="System.Data" />
+    <Reference Include="System.Net.Http" />
+    <Reference Include="System.Xml" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="HTMLParsingExtension.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <PackageReference Include="Markdig.Signed">
+      <Version>0.18.0</Version>
+    </PackageReference>
+    <PackageReference Include="StyleCop.Analyzers">
+      <Version>1.1.118</Version>
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+      <PrivateAssets>all</PrivateAssets>
+    </PackageReference>
+  </ItemGroup>
+  <ItemGroup>
+    <AdditionalFiles Include="..\..\..\codeAnalysis\StyleCop.json">
+      <Link>StyleCop.json</Link>
+    </AdditionalFiles>
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\common\Common.csproj">
+      <Project>{af2349b8-e5b6-4004-9502-687c1c7730b1}</Project>
+      <Name>Common</Name>
+    </ProjectReference>
+  </ItemGroup>
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+</Project>
diff --git a/src/modules/previewpane/MarkDownPreviewHandler/Properties/AssemblyInfo.cs b/src/modules/previewpane/MarkDownPreviewHandler/Properties/AssemblyInfo.cs
@@ -0,0 +1,43 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("MarkDownPreviewHandler")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("MarkDownPreviewHandler")]
+[assembly: AssemblyCopyright("Copyright ©  2020")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Make assembly visible to UnitTest Project
+[assembly: InternalsVisibleTo("PreviewPaneUnitTests")]
+
+// Setting ComVisible to false makes the types in this assembly not visible
+// to COM components.  If you need to access a type in this assembly from
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible(false)]
+
+// The following GUID is for the ID of the typelib if this project is exposed to COM
+[assembly: Guid("6a71162e-fc4c-4a2c-b90f-3cf94f59a9bb")]
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]
diff --git a/...odules/previewpane/PreviewPaneUnitTests/MarkDownPreviewHandlerHTMLParsingExtensionTest.cs b/...odules/previewpane/PreviewPaneUnitTests/MarkDownPreviewHandlerHTMLParsingExtensionTest.cs
@@ -0,0 +1,109 @@
+using System;
+using Markdig;
+using MarkDownPreviewHandler;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace PreviewPaneUnitTests
+{
+    [TestClass]
+    public class MarkDownPreviewHandlerHTMLParsingExtensionTest
+    {
+        public MarkdownPipeline BuidPipeline(IMarkdownExtension extension)
+        {
+            MarkdownPipelineBuilder pipelineBuilder = new MarkdownPipelineBuilder().UseAdvancedExtensions();
+            pipelineBuilder.Extensions.Add(extension);
+            return pipelineBuilder.Build();
+        }
+
+        [TestMethod]
+        public void Extension_UpdatesTablesClass_WhenUsed()
+        {
+            // Arrange 
+            String mdString = "| A | B |\n| -- | -- | ";
+            HTMLParsingExtension htmlParsingExtension = new HTMLParsingExtension();
+            MarkdownPipeline markdownPipeline = BuidPipeline(htmlParsingExtension);
+
+            // Act
+            String html = Markdown.ToHtml(mdString, markdownPipeline);
+
+            // Assert
+            Assert.AreEqual(html, "<table class=\"table table-striped table-bordered\">\n<thead>\n<tr>\n<th>A</th>\n<th>B</th>\n</tr>\n</thead>\n</table>\n");
+        }
+
+
+        [TestMethod]
+        public void Extension_UpdatesBlockQuotesClass_WhenUsed()
+        {
+            // Arrange 
+            String mdString = "> Blockquotes.";
+            HTMLParsingExtension htmlParsingExtension = new HTMLParsingExtension();
+            MarkdownPipeline markdownPipeline = BuidPipeline(htmlParsingExtension);
+
+            // Act
+            String html = Markdown.ToHtml(mdString, markdownPipeline);
+
+            // Assert
+            Assert.AreEqual(html, "<blockquote class=\"blockquote\">\n<p>Blockquotes.</p>\n</blockquote>\n");
+        }
+
+        [TestMethod]
+        public void Extension_UpdatesFigureClassAndRelativeUrltoAbsolute_WhenUsed()
+        {
+            // arrange 
+            String mdString = "![text](a.jpg \"Figure\")";
+            HTMLParsingExtension htmlParsingExtension = new HTMLParsingExtension("C:\\Users\\");
+            MarkdownPipeline markdownPipeline = BuidPipeline(htmlParsingExtension);
+
+            // Act
+            String html = Markdown.ToHtml(mdString, markdownPipeline);
+
+            // Assert
+            Assert.AreEqual(html, "<p><img src=\"file:///C:/Users/a.jpg\" class=\"img-fluid\" alt=\"text\" title=\"Figure\" /></p>\n");
+        }
+
+        [TestMethod]
+        public void Extension_CreatesCorrectAbsoluteLinkByTrimmingForwardSlash_WhenUsed()
+        {
+            // arrange 
+            String mdString = "![text](\\document\\a.jpg \"Figure\")";
+            HTMLParsingExtension htmlParsingExtension = new HTMLParsingExtension("C:\\Users\\");
+            MarkdownPipeline markdownPipeline = BuidPipeline(htmlParsingExtension);
+
+            // Act
+            String html = Markdown.ToHtml(mdString, markdownPipeline);
+
+            // Assert
+            Assert.AreEqual(html, "<p><img src=\"file:///C:/Users/document/a.jpg\" class=\"img-fluid\" alt=\"text\" title=\"Figure\" /></p>\n");
+        }
+
+        [TestMethod]
+        public void Extension_CreatesCorrectAbsoluteLinkByTrimmingBackwardSlash_WhenUsed()
+        {
+            // arrange 
+            String mdString = "![text](/document/a.jpg \"Figure\")";
+            HTMLParsingExtension htmlParsingExtension = new HTMLParsingExtension("C:/Users/");
+            MarkdownPipeline markdownPipeline = BuidPipeline(htmlParsingExtension);
+
+            // Act
+            String html = Markdown.ToHtml(mdString, markdownPipeline);
+
+            // Assert
+            Assert.AreEqual(html, "<p><img src=\"file:///C:/Users/document/a.jpg\" class=\"img-fluid\" alt=\"text\" title=\"Figure\" /></p>\n");
+        }
+
+        [TestMethod]
+        public void Extension_AddsClassToFigureCaption_WhenUsed()
+        {
+            // arrange 
+            String mdString = "^^^ This is a caption";
+            HTMLParsingExtension htmlParsingExtension = new HTMLParsingExtension("C:/Users/");
+            MarkdownPipeline markdownPipeline = BuidPipeline(htmlParsingExtension);
+
+            // Act
+            String html = Markdown.ToHtml(mdString, markdownPipeline);
+
+            // Assert
+            Assert.AreEqual(html, "<figure class=\"figure\">\n<figcaption class=\"figure-caption\">This is a caption</figcaption>\n</figure>\n");
+        }
+    }
+}