Bump to 0.18.2

Merge pull request #406 from FranklinWhale/patch-1
Make output of HtmlTableRenderer XML wellformed
2026-02-04 05:44:50 +00:00 · 2020-03-08 10:15:30 +01:00 · 2020-03-08 10:09:29 +01:00 · 2020-03-08 10:09:03 +01:00 · 2020-03-08 10:08:47 +01:00 · 2020-03-06 19:00:37 +08:00
64 changed files with 3153 additions and 2423 deletions
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,63 @@
+name: ci
+
+env:
+  PROJECT_NAME: Markdig
+
+on:
+  push:
+    paths-ignore:
+    - 'doc/**'
+    - 'img/**'
+    - 'changelog.md'
+    - 'readme.md'
+  pull_request:
+
+jobs:
+  build:
+    runs-on: windows-latest
+
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v1
+
+    - name: Install .NET Core
+      uses: actions/setup-dotnet@v1
+      with:
+        dotnet-version: 3.0.100
+
+    - name: Add coveralls.net
+      run: dotnet tool install coveralls.net --version 1.0.0 --tool-path tools
+
+    - name: Build (Release)
+      run: dotnet build src -c Release
+
+    - name: SpecFileGen
+      run: dotnet src/SpecFileGen/bin/Release/netcoreapp2.1/SpecFileGen.dll
+
+    - name: Test (Release)
+      run: dotnet test src -c Release
+
+    - name: Build & Test (Debug)
+      run: dotnet test src -c Debug
+
+    - name: Coveralls
+      run: dotnet test src -c Release -f netcoreapp2.1 /p:Include=\"[${{env.PROJECT_NAME}}]*\" /p:CollectCoverage=true /p:CoverletOutputFormat=lcov  /p:CoverletOutput=./coverage.info
+
+    - name: Coveralls Upload
+      uses: coverallsapp/github-action@v1.0.1
+      with:
+        github-token: ${{ secrets.GITHUB_TOKEN }}
+        path-to-lcov: src/${{env.PROJECT_NAME}}.Tests/coverage.info
+
+    - name: Pack
+      run: dotnet pack src -c Release
+
+    - name: Publish
+      if: github.event_name == 'push'
+      run: |      
+          if ( "${{github.ref}}" -match "^refs/tags/[0-9]+\.[0-9]+\.[0-9]+$" ) {
+              dotnet nuget push src\${{env.PROJECT_NAME}}\bin\Release\*.nupkg -s nuget.org -k ${{secrets.NUGET_TOKEN}}
+              dotnet nuget push src\${{env.PROJECT_NAME}}.Signed\bin\Release\*.nupkg -s nuget.org -k ${{secrets.NUGET_TOKEN}}
+          } else {
+              echo "publish is only enabled by tagging with a release tag"
+          }
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,74 +0,0 @@
-version: 10.0.{build}
-image: Visual Studio 2019
-configuration: Release
-environment:
-  COVERALLS_REPO_TOKEN:
-    secure: /SEtLgIE6ZrJaWBC1xFZIeESiwfwiXEk9N4pSJ53rFhqBZC2sXJg7ZxZ1DBhnZGu
-install:
- ps: >-
-    cd src
-
-    dotnet tool install -g coveralls.net --version 1.0.0
-
-    nuget restore Markdig.sln
-
-    $env:MARKDIG_BUILD_NUMBER = ([int]$env:APPVEYOR_BUILD_NUMBER).ToString("000")
-
-    $env:MARKDIG_VERSION_SUFFIX = ""
-
-    $env:appveyor_nuget_push = 'false'
-
-    if(-Not $env:APPVEYOR_PULL_REQUEST_NUMBER) {
-      if($env:appveyor_repo_tag -eq 'True') {
-    	  if($env:appveyor_repo_tag_name -match '^[0-9]') {
-           $env:appveyor_nuget_push = 'true'
-           $env:MARKDIG_VERSION_SUFFIX = ""
-        }
-    	  if($env:appveyor_repo_tag_name -eq 'latest') {
-           $env:appveyor_nuget_push = 'true'
-           $env:MARKDIG_VERSION_SUFFIX = "pre$env:MARKDIG_BUILD_NUMBER"
-        }
-      }
-    }
-
-build:
-  project: src/Markdig.sln
-  verbosity: minimal
-
-after_build: >
-  dotnet SpecFileGen/bin/Release/netcoreapp2.2/SpecFileGen.dll
-
-test_script:
- cmd: >-
-    dotnet test Markdig.Tests -c Release --no-build
-
-    dotnet test Markdig.Tests -c Debug
-
-    dotnet test Markdig.Tests -c Release -f netcoreapp2.1 /p:CollectCoverage=true /p:Include=\"[Markdig]*\" /p:CoverletOutputFormat=opencover /p:CoverletOutput=../../coverage.xml
-
-after_test:
- ps: >-
-    if($env:APPVEYOR_REPO_BRANCH -eq "master") {
-      cd ..
-      if (Test-Path "./coverage.xml") {
-        csmacnz.Coveralls --opencover -i "./coverage.xml" --repoToken $env:COVERALLS_REPO_TOKEN --basePath "$env:APPVEYOR_BUILD_FOLDER" --useRelativePath --commitId $env:APPVEYOR_REPO_COMMIT --commitBranch $env:APPVEYOR_REPO_BRANCH --commitAuthor $env:APPVEYOR_REPO_COMMIT_AUTHOR --commitEmail $env:APPVEYOR_REPO_COMMIT_AUTHOR_EMAIL --commitMessage $env:APPVEYOR_REPO_COMMIT_MESSAGE --jobId $env:APPVEYOR_BUILD_NUMBER --serviceName appveyor
-      }
-      cd src
-    }
-
-before_package:
- cmd: >-
-    msbuild /t:pack /p:VersionSuffix="%MARKDIG_VERSION_SUFFIX%" /p:Configuration=Release Markdig/Markdig.csproj
-
-    msbuild /t:pack /p:VersionSuffix="%MARKDIG_VERSION_SUFFIX%" /p:Configuration=Release Markdig.Signed/Markdig.Signed.csproj
-
-artifacts:
- path: src\**\*.nupkg
-  name: Markdig Nugets
-
-deploy:
- provider: NuGet
-  api_key:
-    secure: 7cthHh+wYWZjhqxaxR6QObRaRnstvFkQOY7MkxIsC5kpQEBlKZXuinf0IybbYxJt
-  on:
-    appveyor_nuget_push: true
--- a/changelog.md
+++ b/changelog.md
@@ -1,5 +1,19 @@
 # Changelog

+## 0.18.2 (8 Mar 2020)
+- Optimize LineReader.ReadLine in [PR #393](https://github.com/lunet-io/markdig/pull/393)
+- Use HashSet<T> instead of Dictionary<TKey, TValue> in CharacterMap<T> in [PR #394](https://github.com/lunet-io/markdig/pull/394)
+- Use BitVector128 in CharacterMap<T> in [PR #396](https://github.com/lunet-io/markdig/pull/396)
+- Optimizations in StringLineGroup in [PR #399](https://github.com/lunet-io/markdig/pull/399)
+- Fixed a bug in HeadingRenderer in [PR #402](https://github.com/lunet-io/markdig/pull/402)
+- Fixes issue #303 in [PR #404](https://github.com/lunet-io/markdig/pull/404)
+- Make output of HtmlTableRenderer XML wellformed in [PR #406](https://github.com/lunet-io/markdig/pull/406)
+
+## 0.18.1 (21 Jan 2020)
+- Re-allow emojis and smileys customization, that was broken in [PR #308](https://github.com/lunet-io/markdig/pull/308) ([PR #386](https://github.com/lunet-io/markdig/pull/386))
+- Add `IHostProvider` for medialink customization (#337), support protocol-less url (#135) ([(PR #341)](https://github.com/lunet-io/markdig/pull/341))
+- Add missing Descendants<T> overload ([(PR #387)](https://github.com/lunet-io/markdig/pull/387))
+
 ## 0.18.0 (24 Oct 2019)
 - Ignore backslashes in GFM AutoLinks ([(PR #357)](https://github.com/lunet-io/markdig/pull/357))
 - Fix SmartyPants quote matching ([(PR #360)](https://github.com/lunet-io/markdig/pull/360))
--- a/readme.md
+++ b/readme.md
@@ -1,4 +1,4 @@
-# Markdig [![Build status](https://ci.appveyor.com/api/projects/status/hk391x8jcskxt1u8?svg=true)](https://ci.appveyor.com/project/xoofx/markdig) [![Coverage Status](https://coveralls.io/repos/github/lunet-io/markdig/badge.svg?branch=master)](https://coveralls.io/github/lunet-io/markdig?branch=master) [![NuGet](https://img.shields.io/nuget/v/Markdig.svg)](https://www.nuget.org/packages/Markdig/) [![Donate](https://www.paypalobjects.com/en_US/i/btn/btn_donate_SM.gif)](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=FRGHXBTP442JL)
+# Markdig [![Build Status](https://github.com/lunet-io/markdig/workflows/ci/badge.svg?branch=master)](https://github.com/lunet-io/markdig/actions) [![Coverage Status](https://coveralls.io/repos/github/lunet-io/markdig/badge.svg?branch=master)](https://coveralls.io/github/lunet-io/markdig?branch=master) [![NuGet](https://img.shields.io/nuget/v/Markdig.svg)](https://www.nuget.org/packages/Markdig/) [![Donate](https://www.paypalobjects.com/en_US/i/btn/btn_donate_SM.gif)](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=FRGHXBTP442JL)

 <img align="right" width="160px" height="160px" src="img/markdig.png">

@@ -21,7 +21,7 @@ You can **try Markdig online** and compare it to other implementations on [babel
  - Even the core Markdown/CommonMark parsing is pluggable, so it allows to disable builtin Markdown/Commonmark parsing (e.g [Disable HTML parsing](https://github.com/lunet-io/markdig/blob/7964bd0160d4c18e4155127a4c863d61ebd8944a/src/Markdig/MarkdownExtensions.cs#L306)) or change behaviour (e.g change matching `#` of a headers with `@`)   
 - Built-in with **20+ extensions**, including:
  - 2 kind of tables:
-    - [**Pipe tables**](src/Markdig.Tests/Specs/PipeTableSpecs.md) (inspired from Github tables and [PanDoc - Pipe Tables](http://pandoc.org/README.html#extension-pipe_tables))
+    - [**Pipe tables**](src/Markdig.Tests/Specs/PipeTableSpecs.md) (inspired from GitHub tables and [PanDoc - Pipe Tables](http://pandoc.org/README.html#extension-pipe_tables))
    - [**Grid tables**](src/Markdig.Tests/Specs/GridTableSpecs.md) (inspired from [Pandoc - Grid Tables](http://pandoc.org/README.html#extension-grid_tables)) 
  - [**Extra emphasis**](src/Markdig.Tests/Specs/EmphasisExtraSpecs.md) (inspired from [Pandoc - Emphasis](http://pandoc.org/README.html#strikeout) and [Markdown-it](https://markdown-it.github.io/)) 
    - strike through `~~`,
@@ -48,7 +48,7 @@ You can **try Markdig online** and compare it to other implementations on [babel
  - [**SmartyPants**](src/Markdig.Tests/Specs/SmartyPantsSpecs.md) (inspired from [Daring Fireball - SmartyPants](https://daringfireball.net/projects/smartypants/))
  - [**Bootstrap**](src/Markdig.Tests/Specs/BootstrapSpecs.md) class (to output bootstrap class)
  - [**Diagrams**](src/Markdig.Tests/Specs/DiagramsSpecs.md) extension whenever a fenced code block contains a special keyword, it will be converted to a div block with the content as-is (currently, supports [`mermaid`](https://knsv.github.io/mermaid/) and [`nomnoml`](https://github.com/skanaar/nomnoml) diagrams)
-  - [**YAML frontmatter**](src/Markdig.Tests/Specs/YamlSpecs.md) to parse without evaluating the frontmatter and to discard it from the HTML output (typically used for previewing without the frontmatter in MarkdownEditor)
+  - [**YAML Front Matter**](src/Markdig.Tests/Specs/YamlSpecs.md) to parse without evaluating the front matter and to discard it from the HTML output (typically used for previewing without the front matter in MarkdownEditor)
  - [**JIRA links**](src/Markdig.Tests/Specs/JiraLinks.md) to automatically generate links for JIRA project references (Thanks to @clarkd: https://github.com/clarkd/MarkdigJiraLinker)
 - Compatible with .NET 3.5, 4.0+ and .NET Core (`netstandard1.1+`)
 	
@@ -84,7 +84,7 @@ var result = Markdown.ToHtml("This is a text with some *emphasis*");
 Console.WriteLine(result);   // prints: <p>This is a text with some <em>emphasis</em></p>
 ```

-In order to activate most of all advanced extensions (except Emoji, SoftLine as HardLine, JiraLinks and SmartyPants)
+In order to activate most of all advanced extensions (except Emoji, SoftLine as HardLine, Bootstrap, YAML Front Matter, JiraLinks and SmartyPants)

 ```csharp
 // Configure the pipeline with all advanced extensions active
--- a/src/Markdig.Benchmarks/Markdig.Benchmarks.csproj
+++ b/src/Markdig.Benchmarks/Markdig.Benchmarks.csproj
@@ -1,8 +1,9 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <TargetFrameworks>net471</TargetFrameworks>
    <OutputType>Exe</OutputType>
    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
+    <IsPackable>false</IsPackable>
  </PropertyGroup>
  <ItemGroup>
    <None Remove="spec.md" />
--- a/src/Markdig.Tests/Markdig.Tests.csproj
+++ b/src/Markdig.Tests/Markdig.Tests.csproj
@@ -1,8 +1,9 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
-	<TargetFrameworks>net451;netcoreapp2.1</TargetFrameworks>
+  	<TargetFrameworks>net451;netcoreapp2.1</TargetFrameworks>
    <OutputType>Library</OutputType>
+    <IsPackable>false</IsPackable>
  </PropertyGroup>

  <ItemGroup>
--- a/src/Markdig.Tests/Specs/AbbreviationSpecs.generated.cs
+++ b/src/Markdig.Tests/Specs/AbbreviationSpecs.generated.cs
@@ -1,4 +1,4 @@
-// Generated: 2019-04-05 16:06:14
+// Generated: 2019-05-15 02:46:55

 // --------------------------------
 //           Abbreviations
--- a/src/Markdig.Tests/Specs/EmojiSpecs.generated.cs
+++ b/src/Markdig.Tests/Specs/EmojiSpecs.generated.cs
@@ -1,4 +1,4 @@
-// Generated: 2019-04-15 05:20:50
+// Generated: 2020-01-13 21:08:58

 // --------------------------------
 //               Emoji
@@ -18,7 +18,7 @@ namespace Markdig.Tests.Specs.Emoji
        // 
        // ## Emoji
        // 
-        // Emoji and smiley can be converted to their respective unicode characters:
+        // Emoji shortcodes and smileys can be converted to their respective unicode characters:
        [Test]
        public void ExtensionsEmoji_Example001()
        {
@@ -52,7 +52,7 @@ namespace Markdig.Tests.Specs.Emoji
            TestParser.TestSpec("These are not:) an emoji with a:) x:angry:x", "<p>These are not:) an emoji with a:) x:angry:x</p>", "emojis|advanced+emojis");
        }

-        // Emoji can be followed by close punctuation (or any other characters):
+        // Emojis can be followed by close punctuation (or any other characters):
        [Test]
        public void ExtensionsEmoji_Example003()
        {
@@ -69,7 +69,7 @@ namespace Markdig.Tests.Specs.Emoji
            TestParser.TestSpec("We all need :), it makes us :muscle:. (and :ok_hand:).", "<p>We all need 😃, it makes us 💪. (and 👌).</p>", "emojis|advanced+emojis");
        }

-        // Sentences can end with Emoji:
+        // Sentences can end with emojis:
        [Test]
        public void ExtensionsEmoji_Example004()
        {
--- a/src/Markdig.Tests/Specs/EmojiSpecs.md
+++ b/src/Markdig.Tests/Specs/EmojiSpecs.md
@@ -4,7 +4,7 @@ This section describes the different extensions supported:

 ## Emoji

-Emoji and smiley can be converted to their respective unicode characters:
+Emoji shortcodes and smileys can be converted to their respective unicode characters:

 ```````````````````````````````` example
 This is a test with a :) and a :angry: smiley
@@ -20,7 +20,7 @@ These are not:) an emoji with a:) x:angry:x
 <p>These are not:) an emoji with a:) x:angry:x</p>
 ````````````````````````````````

-Emoji can be followed by close punctuation (or any other characters):
+Emojis can be followed by close punctuation (or any other characters):

 ```````````````````````````````` example
 We all need :), it makes us :muscle:. (and :ok_hand:).
@@ -28,7 +28,7 @@ We all need :), it makes us :muscle:. (and :ok_hand:).
 <p>We all need 😃, it makes us 💪. (and 👌).</p>
 ````````````````````````````````

-Sentences can end with Emoji:
+Sentences can end with emojis:

 ```````````````````````````````` example
 This is a sentence :ok_hand:
--- a/src/Markdig.Tests/Specs/GridTableSpecs.md
+++ b/src/Markdig.Tests/Specs/GridTableSpecs.md
@@ -42,8 +42,8 @@ The following is a valid row separator
 | This is | a table |
 .
 <table>
-<col style="width:50%">
-<col style="width:50%">
+<col style="width:50%" />
+<col style="width:50%" />
 <tbody>
 <tr>
 <td>This is</td>
@@ -74,9 +74,9 @@ A regular row can continue a previous regular row when column separator `|` are
 | Col1c                       |
 .
 <table>
-<col style="width:33.33%">
-<col style="width:33.33%">
-<col style="width:33.33%">
+<col style="width:33.33%" />
+<col style="width:33.33%" />
+<col style="width:33.33%" />
 <tbody>
 <tr>
 <td>Col1
@@ -105,8 +105,8 @@ A row header is separated using `+========+` instead of `+---------+`:
 +=========+=========+
 .
 <table>
-<col style="width:50%">
-<col style="width:50%">
+<col style="width:50%" />
+<col style="width:50%" />
 <thead>
 <tr>
 <th>This is</th>
@@ -123,8 +123,8 @@ The last column separator `|` may be omitted:
 | This is | a table with a longer text in the second column
 .
 <table>
-<col style="width:50%">
-<col style="width:50%">
+<col style="width:50%" />
+<col style="width:50%" />
 <tbody>
 <tr>
 <td>This is</td>
@@ -150,9 +150,9 @@ So the width would be 4/16 = 25%, 8/16 = 50%, 4/16 = 25%
 +----+--------+----+
 .
 <table>
-<col style="width:25%">
-<col style="width:50%">
-<col style="width:25%">
+<col style="width:25%" />
+<col style="width:50%" />
+<col style="width:25%" />
 <tbody>
 <tr>
 <td>A</td>
@@ -172,9 +172,9 @@ Alignment might be specified on the first row using the character `:`:
 +-----+-----+-----+
 .
 <table>
-<col style="width:33.33%">
-<col style="width:33.33%">
-<col style="width:33.33%">
+<col style="width:33.33%" />
+<col style="width:33.33%" />
+<col style="width:33.33%" />
 <tbody>
 <tr>
 <td>A</td>
@@ -197,9 +197,9 @@ Alignment might be specified on the first row using the character `:`:
 +---+---+---+
 .
 <table>
-<col style="width:33.33%">
-<col style="width:33.33%">
-<col style="width:33.33%">
+<col style="width:33.33%" />
+<col style="width:33.33%" />
+<col style="width:33.33%" />
 <tbody>
 <tr>
 <td colspan="2">AAAAA</td>
@@ -232,9 +232,9 @@ A grid table may have cells with both colspan and rowspan:
 +---+---+---+
 .
 <table>
-<col style="width:33.33%">
-<col style="width:33.33%">
-<col style="width:33.33%">
+<col style="width:33.33%" />
+<col style="width:33.33%" />
+<col style="width:33.33%" />
 <tbody>
 <tr>
 <td colspan="2" rowspan="2">AAAAA
--- a/src/Markdig.Tests/Specs/MediaSpecs.generated.cs
+++ b/src/Markdig.Tests/Specs/MediaSpecs.generated.cs
@@ -1,4 +1,4 @@
-// Generated: 2019-04-29 18:40:06
+// Generated: 2019-05-15 02:46:20

 // --------------------------------
 //               Media
@@ -47,19 +47,19 @@ namespace Markdig.Tests.Specs.Media
            //     ![ok.ru](https://ok.ru/video/26870090463)
            //
            // Should be rendered as:
-            //     <p><iframe src="https://www.youtube.com/embed/mswPy5bt3TQ" width="500" height="281" frameborder="0" allowfullscreen=""></iframe></p>
-            //     <p><iframe src="https://www.youtube.com/embed/mswPy5bt3TQ?start=100" width="500" height="281" frameborder="0" allowfullscreen=""></iframe></p>
-            //     <p><iframe src="https://www.youtube.com/embed/mswPy5bt3TQ" width="500" height="281" frameborder="0" allowfullscreen=""></iframe></p>
-            //     <p><iframe src="https://www.youtube.com/embed/mswPy5bt3TQ?start=100" width="500" height="281" frameborder="0" allowfullscreen=""></iframe></p>
-            //     <p><iframe src="https://www.youtube.com/embed/mswPy5bt3TQ?start=100&amp;rel=0" width="500" height="281" frameborder="0" allowfullscreen=""></iframe></p>
-            //     <p><iframe src="https://www.youtube.com/embed?listType=playlist&amp;list=PLC77007E23FF423C6" width="500" height="281" frameborder="0" allowfullscreen=""></iframe></p>
-            //     <p><iframe src="https://player.vimeo.com/video/8607834" width="500" height="281" frameborder="0" allowfullscreen=""></iframe></p>
+            //     <p><iframe src="https://www.youtube.com/embed/mswPy5bt3TQ" width="500" height="281" class="youtube" frameborder="0" allowfullscreen=""></iframe></p>
+            //     <p><iframe src="https://www.youtube.com/embed/mswPy5bt3TQ?start=100" width="500" height="281" class="youtube" frameborder="0" allowfullscreen=""></iframe></p>
+            //     <p><iframe src="https://www.youtube.com/embed/mswPy5bt3TQ" width="500" height="281" class="youtube" frameborder="0" allowfullscreen=""></iframe></p>
+            //     <p><iframe src="https://www.youtube.com/embed/mswPy5bt3TQ?start=100" width="500" height="281" class="youtube" frameborder="0" allowfullscreen=""></iframe></p>
+            //     <p><iframe src="https://www.youtube.com/embed/mswPy5bt3TQ?start=100&amp;rel=0" width="500" height="281" class="youtube" frameborder="0" allowfullscreen=""></iframe></p>
+            //     <p><iframe src="https://www.youtube.com/embed?listType=playlist&amp;list=PLC77007E23FF423C6" width="500" height="281" class="youtube" frameborder="0" allowfullscreen=""></iframe></p>
+            //     <p><iframe src="https://player.vimeo.com/video/8607834" width="500" height="281" class="vimeo" frameborder="0" allowfullscreen=""></iframe></p>
            //     <p><video width="500" height="281" controls=""><source type="video/mp4" src="https://sample.com/video.mp4"></source></video></p>
-            //     <p><iframe src="https://music.yandex.ru/iframe/#track/4402274/411845/" width="500" height="281" frameborder="0"></iframe></p>
-            //     <p><iframe src="https://ok.ru/videoembed/26870090463" width="500" height="281" frameborder="0" allowfullscreen=""></iframe></p>
+            //     <p><iframe src="https://music.yandex.ru/iframe/#track/4402274/411845/" width="500" height="281" class="yandex" frameborder="0"></iframe></p>
+            //     <p><iframe src="https://ok.ru/videoembed/26870090463" width="500" height="281" class="odnoklassniki" frameborder="0" allowfullscreen=""></iframe></p>

            Console.WriteLine("Example 1\nSection Extensions / Media links\n");
-            TestParser.TestSpec("![youtube.com](https://www.youtube.com/watch?v=mswPy5bt3TQ)\n\n![youtube.com with t](https://www.youtube.com/watch?v=mswPy5bt3TQ&t=100)\n\n![youtu.be](https://youtu.be/mswPy5bt3TQ)\n\n![youtu.be with t](https://youtu.be/mswPy5bt3TQ?t=100)\n\n![youtube.com/embed 1](https://www.youtube.com/embed/mswPy5bt3TQ?start=100&rel=0)\n \n![youtube.com/embed 2](https://www.youtube.com/embed?listType=playlist&list=PLC77007E23FF423C6)\n\n![vimeo](https://vimeo.com/8607834)\n\n![static mp4](https://sample.com/video.mp4)\n\n![yandex.ru](https://music.yandex.ru/album/411845/track/4402274)\n\n![ok.ru](https://ok.ru/video/26870090463)", "<p><iframe src=\"https://www.youtube.com/embed/mswPy5bt3TQ\" width=\"500\" height=\"281\" frameborder=\"0\" allowfullscreen=\"\"></iframe></p>\n<p><iframe src=\"https://www.youtube.com/embed/mswPy5bt3TQ?start=100\" width=\"500\" height=\"281\" frameborder=\"0\" allowfullscreen=\"\"></iframe></p>\n<p><iframe src=\"https://www.youtube.com/embed/mswPy5bt3TQ\" width=\"500\" height=\"281\" frameborder=\"0\" allowfullscreen=\"\"></iframe></p>\n<p><iframe src=\"https://www.youtube.com/embed/mswPy5bt3TQ?start=100\" width=\"500\" height=\"281\" frameborder=\"0\" allowfullscreen=\"\"></iframe></p>\n<p><iframe src=\"https://www.youtube.com/embed/mswPy5bt3TQ?start=100&amp;rel=0\" width=\"500\" height=\"281\" frameborder=\"0\" allowfullscreen=\"\"></iframe></p>\n<p><iframe src=\"https://www.youtube.com/embed?listType=playlist&amp;list=PLC77007E23FF423C6\" width=\"500\" height=\"281\" frameborder=\"0\" allowfullscreen=\"\"></iframe></p>\n<p><iframe src=\"https://player.vimeo.com/video/8607834\" width=\"500\" height=\"281\" frameborder=\"0\" allowfullscreen=\"\"></iframe></p>\n<p><video width=\"500\" height=\"281\" controls=\"\"><source type=\"video/mp4\" src=\"https://sample.com/video.mp4\"></source></video></p>\n<p><iframe src=\"https://music.yandex.ru/iframe/#track/4402274/411845/\" width=\"500\" height=\"281\" frameborder=\"0\"></iframe></p>\n<p><iframe src=\"https://ok.ru/videoembed/26870090463\" width=\"500\" height=\"281\" frameborder=\"0\" allowfullscreen=\"\"></iframe></p>", "medialinks|advanced+medialinks");
+            TestParser.TestSpec("![youtube.com](https://www.youtube.com/watch?v=mswPy5bt3TQ)\n\n![youtube.com with t](https://www.youtube.com/watch?v=mswPy5bt3TQ&t=100)\n\n![youtu.be](https://youtu.be/mswPy5bt3TQ)\n\n![youtu.be with t](https://youtu.be/mswPy5bt3TQ?t=100)\n\n![youtube.com/embed 1](https://www.youtube.com/embed/mswPy5bt3TQ?start=100&rel=0)\n \n![youtube.com/embed 2](https://www.youtube.com/embed?listType=playlist&list=PLC77007E23FF423C6)\n\n![vimeo](https://vimeo.com/8607834)\n\n![static mp4](https://sample.com/video.mp4)\n\n![yandex.ru](https://music.yandex.ru/album/411845/track/4402274)\n\n![ok.ru](https://ok.ru/video/26870090463)", "<p><iframe src=\"https://www.youtube.com/embed/mswPy5bt3TQ\" width=\"500\" height=\"281\" class=\"youtube\" frameborder=\"0\" allowfullscreen=\"\"></iframe></p>\n<p><iframe src=\"https://www.youtube.com/embed/mswPy5bt3TQ?start=100\" width=\"500\" height=\"281\" class=\"youtube\" frameborder=\"0\" allowfullscreen=\"\"></iframe></p>\n<p><iframe src=\"https://www.youtube.com/embed/mswPy5bt3TQ\" width=\"500\" height=\"281\" class=\"youtube\" frameborder=\"0\" allowfullscreen=\"\"></iframe></p>\n<p><iframe src=\"https://www.youtube.com/embed/mswPy5bt3TQ?start=100\" width=\"500\" height=\"281\" class=\"youtube\" frameborder=\"0\" allowfullscreen=\"\"></iframe></p>\n<p><iframe src=\"https://www.youtube.com/embed/mswPy5bt3TQ?start=100&amp;rel=0\" width=\"500\" height=\"281\" class=\"youtube\" frameborder=\"0\" allowfullscreen=\"\"></iframe></p>\n<p><iframe src=\"https://www.youtube.com/embed?listType=playlist&amp;list=PLC77007E23FF423C6\" width=\"500\" height=\"281\" class=\"youtube\" frameborder=\"0\" allowfullscreen=\"\"></iframe></p>\n<p><iframe src=\"https://player.vimeo.com/video/8607834\" width=\"500\" height=\"281\" class=\"vimeo\" frameborder=\"0\" allowfullscreen=\"\"></iframe></p>\n<p><video width=\"500\" height=\"281\" controls=\"\"><source type=\"video/mp4\" src=\"https://sample.com/video.mp4\"></source></video></p>\n<p><iframe src=\"https://music.yandex.ru/iframe/#track/4402274/411845/\" width=\"500\" height=\"281\" class=\"yandex\" frameborder=\"0\"></iframe></p>\n<p><iframe src=\"https://ok.ru/videoembed/26870090463\" width=\"500\" height=\"281\" class=\"odnoklassniki\" frameborder=\"0\" allowfullscreen=\"\"></iframe></p>", "medialinks|advanced+medialinks");
        }
    }
 }
--- a/src/Markdig.Tests/Specs/MediaSpecs.md
+++ b/src/Markdig.Tests/Specs/MediaSpecs.md
@@ -27,14 +27,14 @@ Allows to embed audio/video links to popular website:

 ![ok.ru](https://ok.ru/video/26870090463)
 .
-<p><iframe src="https://www.youtube.com/embed/mswPy5bt3TQ" width="500" height="281" frameborder="0" allowfullscreen=""></iframe></p>
-<p><iframe src="https://www.youtube.com/embed/mswPy5bt3TQ?start=100" width="500" height="281" frameborder="0" allowfullscreen=""></iframe></p>
-<p><iframe src="https://www.youtube.com/embed/mswPy5bt3TQ" width="500" height="281" frameborder="0" allowfullscreen=""></iframe></p>
-<p><iframe src="https://www.youtube.com/embed/mswPy5bt3TQ?start=100" width="500" height="281" frameborder="0" allowfullscreen=""></iframe></p>
-<p><iframe src="https://www.youtube.com/embed/mswPy5bt3TQ?start=100&amp;rel=0" width="500" height="281" frameborder="0" allowfullscreen=""></iframe></p>
-<p><iframe src="https://www.youtube.com/embed?listType=playlist&amp;list=PLC77007E23FF423C6" width="500" height="281" frameborder="0" allowfullscreen=""></iframe></p>
-<p><iframe src="https://player.vimeo.com/video/8607834" width="500" height="281" frameborder="0" allowfullscreen=""></iframe></p>
+<p><iframe src="https://www.youtube.com/embed/mswPy5bt3TQ" width="500" height="281" class="youtube" frameborder="0" allowfullscreen=""></iframe></p>
+<p><iframe src="https://www.youtube.com/embed/mswPy5bt3TQ?start=100" width="500" height="281" class="youtube" frameborder="0" allowfullscreen=""></iframe></p>
+<p><iframe src="https://www.youtube.com/embed/mswPy5bt3TQ" width="500" height="281" class="youtube" frameborder="0" allowfullscreen=""></iframe></p>
+<p><iframe src="https://www.youtube.com/embed/mswPy5bt3TQ?start=100" width="500" height="281" class="youtube" frameborder="0" allowfullscreen=""></iframe></p>
+<p><iframe src="https://www.youtube.com/embed/mswPy5bt3TQ?start=100&amp;rel=0" width="500" height="281" class="youtube" frameborder="0" allowfullscreen=""></iframe></p>
+<p><iframe src="https://www.youtube.com/embed?listType=playlist&amp;list=PLC77007E23FF423C6" width="500" height="281" class="youtube" frameborder="0" allowfullscreen=""></iframe></p>
+<p><iframe src="https://player.vimeo.com/video/8607834" width="500" height="281" class="vimeo" frameborder="0" allowfullscreen=""></iframe></p>
 <p><video width="500" height="281" controls=""><source type="video/mp4" src="https://sample.com/video.mp4"></source></video></p>
-<p><iframe src="https://music.yandex.ru/iframe/#track/4402274/411845/" width="500" height="281" frameborder="0"></iframe></p>
-<p><iframe src="https://ok.ru/videoembed/26870090463" width="500" height="281" frameborder="0" allowfullscreen=""></iframe></p>
+<p><iframe src="https://music.yandex.ru/iframe/#track/4402274/411845/" width="500" height="281" class="yandex" frameborder="0"></iframe></p>
+<p><iframe src="https://ok.ru/videoembed/26870090463" width="500" height="281" class="odnoklassniki" frameborder="0" allowfullscreen=""></iframe></p>
 ````````````````````````````````
--- a/src/Markdig.Tests/TestContainerBlocks.cs
+++ b/src/Markdig.Tests/TestContainerBlocks.cs
@@ -0,0 +1,70 @@
+using System;
+using Markdig.Syntax;
+using NUnit.Framework;
+
+namespace Markdig.Tests
+{
+    public class TestContainerBlocks
+    {
+        private class MockContainerBlock : ContainerBlock
+        {
+            public MockContainerBlock()
+                : base(null)
+            {
+
+            }
+        }
+
+        [Test]
+        public void CanBeCleared()
+        {
+            ContainerBlock container = new MockContainerBlock();
+            Assert.AreEqual(0, container.Count);
+            Assert.Null(container.LastChild);
+
+            var paragraph = new ParagraphBlock();
+            Assert.Null(paragraph.Parent);
+
+            container.Add(paragraph);
+
+            Assert.AreEqual(1, container.Count);
+            Assert.AreSame(container, paragraph.Parent);
+            Assert.AreSame(paragraph, container.LastChild);
+
+            container.Clear();
+
+            Assert.AreEqual(0, container.Count);
+            Assert.Null(container.LastChild);
+            Assert.Null(paragraph.Parent);
+        }
+
+        [Test]
+        public void CanBeInsertedInto()
+        {
+            ContainerBlock container = new MockContainerBlock();
+
+            var one = new ParagraphBlock();
+            container.Insert(0, one);
+            Assert.AreEqual(1, container.Count);
+            Assert.AreSame(container[0], one);
+
+            var two = new ParagraphBlock();
+            container.Insert(1, two);
+            Assert.AreEqual(2, container.Count);
+            Assert.AreSame(container[0], one);
+            Assert.AreSame(container[1], two);
+
+            var three = new ParagraphBlock();
+            container.Insert(0, three);
+            Assert.AreEqual(3, container.Count);
+            Assert.AreSame(container[0], three);
+            Assert.AreSame(container[1], one);
+            Assert.AreSame(container[2], two);
+
+            Assert.Throws<ArgumentNullException>(() => container.Insert(0, null));
+            Assert.Throws<ArgumentOutOfRangeException>(() => container.Insert(4, new ParagraphBlock()));
+            Assert.Throws<ArgumentOutOfRangeException>(() => container.Insert(-1, new ParagraphBlock()));
+            Assert.Throws<ArgumentException>(() => container.Insert(0, one)); // one already has a parent
+        }
+    }
+}
--- a/src/Markdig.Tests/TestCustomEmojis.cs
+++ b/src/Markdig.Tests/TestCustomEmojis.cs
@@ -0,0 +1,129 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using Markdig.Extensions.Emoji;
+using NUnit.Framework;
+
+namespace Markdig.Tests
+{
+    [TestFixture]
+    public class TestCustomEmojis
+    {
+        [Test]
+        [TestCase(":smiley:", "<p>♥</p>\n")]
+        [TestCase(":confused:", "<p>:confused:</p>\n")] // default emoji does not work
+        [TestCase(":/", "<p>:/</p>\n")] // default smiley does not work
+        public void TestCustomEmoji(string input, string expected)
+        {
+            var emojiToUnicode = new Dictionary<string, string>();
+            var smileyToEmoji = new Dictionary<string, string>();
+
+            emojiToUnicode[":smiley:"] = "♥";
+
+            var customMapping = new EmojiMapping(emojiToUnicode, smileyToEmoji);
+
+            var pipeline = new MarkdownPipelineBuilder()
+                .UseEmojiAndSmiley(customEmojiMapping: customMapping)
+                .Build();
+
+            var actual = Markdown.ToHtml(input, pipeline);
+            Assert.AreEqual(expected, actual);
+        }
+
+        [Test]
+        [TestCase(":testheart:", "<p>♥</p>\n")]
+        [TestCase("hello", "<p>♥</p>\n")]
+        [TestCase(":confused:", "<p>:confused:</p>\n")] // default emoji does not work
+        [TestCase(":/", "<p>:/</p>\n")] // default smiley does not work
+        public void TestCustomSmiley(string input, string expected)
+        {
+            var emojiToUnicode = new Dictionary<string, string>();
+            var smileyToEmoji = new Dictionary<string, string>();
+
+            emojiToUnicode[":testheart:"] = "♥";
+            smileyToEmoji["hello"] = ":testheart:";
+
+            var customMapping = new EmojiMapping(emojiToUnicode, smileyToEmoji);
+
+            var pipeline = new MarkdownPipelineBuilder()
+                .UseEmojiAndSmiley(customEmojiMapping: customMapping)
+                .Build();
+
+            var actual = Markdown.ToHtml(input, pipeline);
+            Assert.AreEqual(expected, actual);
+        }
+
+        [Test]
+        [TestCase(":smiley:", "<p>♥</p>\n")]
+        [TestCase(":)", "<p>♥</p>\n")]
+        [TestCase(":confused:", "<p>😕</p>\n")] // default emoji still works
+        [TestCase(":/", "<p>😕</p>\n")] // default smiley still works
+        public void TestOverrideDefaultWithCustomEmoji(string input, string expected)
+        {
+            var emojiToUnicode = EmojiMapping.GetDefaultEmojiShortcodeToUnicode();
+            var smileyToEmoji = EmojiMapping.GetDefaultSmileyToEmojiShortcode();
+
+            emojiToUnicode[":smiley:"] = "♥";
+
+            var customMapping = new EmojiMapping(emojiToUnicode, smileyToEmoji);
+
+            var pipeline = new MarkdownPipelineBuilder()
+                .UseEmojiAndSmiley(customEmojiMapping: customMapping)
+                .Build();
+
+            var actual = Markdown.ToHtml(input, pipeline);
+            Assert.AreEqual(expected, actual);
+        }
+
+        [Test]
+        [TestCase(":testheart:", "<p>♥</p>\n")]
+        [TestCase("hello", "<p>♥</p>\n")]
+        [TestCase(":confused:", "<p>😕</p>\n")] // default emoji still works
+        [TestCase(":/", "<p>😕</p>\n")] // default smiley still works
+        public void TestOverrideDefaultWithCustomSmiley(string input, string expected)
+        {
+            var emojiToUnicode = EmojiMapping.GetDefaultEmojiShortcodeToUnicode();
+            var smileyToEmoji = EmojiMapping.GetDefaultSmileyToEmojiShortcode();
+
+            emojiToUnicode[":testheart:"] = "♥";
+            smileyToEmoji["hello"] = ":testheart:";
+
+            var customMapping = new EmojiMapping(emojiToUnicode, smileyToEmoji);
+
+            var pipeline = new MarkdownPipelineBuilder()
+                .UseEmojiAndSmiley(customEmojiMapping: customMapping)
+                .Build();
+
+            var actual = Markdown.ToHtml(input, pipeline);
+            Assert.AreEqual(expected, actual);
+        }
+
+        [Test]
+        public void TestCustomEmojiValidation()
+        {
+            var emojiToUnicode = new Dictionary<string, string>();
+            var smileyToEmoji = new Dictionary<string, string>();
+
+            Assert.Throws<ArgumentNullException>(() => new EmojiMapping(null, smileyToEmoji));
+            Assert.Throws<ArgumentNullException>(() => new EmojiMapping(emojiToUnicode, null));
+
+            emojiToUnicode.Add("null-value", null);
+            Assert.Throws<ArgumentException>(() => new EmojiMapping(emojiToUnicode, smileyToEmoji));
+            emojiToUnicode.Clear();
+
+            smileyToEmoji.Add("null-value", null);
+            Assert.Throws<ArgumentException>(() => new EmojiMapping(emojiToUnicode, smileyToEmoji));
+            smileyToEmoji.Clear();
+
+            smileyToEmoji.Add("foo", "something-that-does-not-exist-in-emojiToUnicode");
+            Assert.Throws<ArgumentException>(() => new EmojiMapping(emojiToUnicode, smileyToEmoji));
+            smileyToEmoji.Clear();
+
+            emojiToUnicode.Add("a", "aaa");
+            emojiToUnicode.Add("b", "bbb");
+            emojiToUnicode.Add("c", "ccc");
+            smileyToEmoji.Add("a", "c"); // "a" already exists in emojiToUnicode
+            Assert.Throws<ArgumentException>(() => new EmojiMapping(emojiToUnicode, smileyToEmoji));
+        }
+    }
+}
--- a/src/Markdig.Tests/TestDescendantsOrder.cs
+++ b/src/Markdig.Tests/TestDescendantsOrder.cs
@@ -3,6 +3,7 @@ using Markdig.Syntax;
 using Markdig.Syntax.Inlines;
 using System.Linq;
 using System.Collections.Generic;
+using Markdig.Helpers;

 namespace Markdig.Tests
 {
@@ -12,24 +13,91 @@ namespace Markdig.Tests
        [Test]
        public void TestSchemas()
        {
-            foreach (var markdown in TestParser.SpecsMarkdown)
+            foreach (var syntaxTree in TestParser.SpecsSyntaxTrees)
            {
-                AssertSameDescendantsOrder(markdown);
+                AssertIEnumerablesAreEqual(
+                    Descendants_Legacy(syntaxTree),
+                    syntaxTree.Descendants());
+
+                AssertIEnumerablesAreEqual(
+                    syntaxTree.Descendants().OfType<ParagraphBlock>(),
+                    syntaxTree.Descendants<ParagraphBlock>());
+
+                AssertIEnumerablesAreEqual(
+                    syntaxTree.Descendants().OfType<ParagraphBlock>(),
+                    (syntaxTree as ContainerBlock).Descendants<ParagraphBlock>());
+
+                AssertIEnumerablesAreEqual(
+                    syntaxTree.Descendants().OfType<LiteralInline>(),
+                    syntaxTree.Descendants<LiteralInline>());
+
+                foreach (LiteralInline literalInline in syntaxTree.Descendants<LiteralInline>())
+                {
+                    Assert.AreSame(ArrayHelper<ListBlock>.Empty, literalInline.Descendants<ListBlock>());
+                    Assert.AreSame(ArrayHelper<ParagraphBlock>.Empty, literalInline.Descendants<ParagraphBlock>());
+                    Assert.AreSame(ArrayHelper<ContainerInline>.Empty, literalInline.Descendants<ContainerInline>());
+                }
+
+                foreach (ContainerInline containerInline in syntaxTree.Descendants<ContainerInline>())
+                {
+                    AssertIEnumerablesAreEqual(
+                        containerInline.FindDescendants<LiteralInline>(),
+                        containerInline.Descendants<LiteralInline>());
+
+                    AssertIEnumerablesAreEqual(
+                        containerInline.FindDescendants<LiteralInline>(),
+                        (containerInline as MarkdownObject).Descendants<LiteralInline>());
+
+                    if (containerInline.FirstChild is null)
+                    {
+                        Assert.AreSame(ArrayHelper<LiteralInline>.Empty, containerInline.Descendants<LiteralInline>());
+                        Assert.AreSame(ArrayHelper<LiteralInline>.Empty, containerInline.FindDescendants<LiteralInline>());
+                        Assert.AreSame(ArrayHelper<LiteralInline>.Empty, (containerInline as MarkdownObject).Descendants<LiteralInline>());
+                    }
+
+                    Assert.AreSame(ArrayHelper<ListBlock>.Empty, containerInline.Descendants<ListBlock>());
+                    Assert.AreSame(ArrayHelper<ParagraphBlock>.Empty, containerInline.Descendants<ParagraphBlock>());
+                }
+
+                foreach (ParagraphBlock paragraphBlock in syntaxTree.Descendants<ParagraphBlock>())
+                {
+                    AssertIEnumerablesAreEqual(
+                        (paragraphBlock as MarkdownObject).Descendants<LiteralInline>(),
+                        paragraphBlock.Descendants<LiteralInline>());
+
+                    Assert.AreSame(ArrayHelper<ParagraphBlock>.Empty, paragraphBlock.Descendants<ParagraphBlock>());
+                }
+
+                foreach (ContainerBlock containerBlock in syntaxTree.Descendants<ContainerBlock>())
+                {
+                    AssertIEnumerablesAreEqual(
+                        containerBlock.Descendants<LiteralInline>(),
+                        (containerBlock as MarkdownObject).Descendants<LiteralInline>());
+
+                    AssertIEnumerablesAreEqual(
+                        containerBlock.Descendants<ParagraphBlock>(),
+                        (containerBlock as MarkdownObject).Descendants<ParagraphBlock>());
+
+                    if (containerBlock.Count == 0)
+                    {
+                        Assert.AreSame(ArrayHelper<LiteralInline>.Empty, containerBlock.Descendants<LiteralInline>());
+                        Assert.AreSame(ArrayHelper<LiteralInline>.Empty, (containerBlock as Block).Descendants<LiteralInline>());
+                        Assert.AreSame(ArrayHelper<LiteralInline>.Empty, (containerBlock as MarkdownObject).Descendants<LiteralInline>());
+                    }
+                }
            }
        }

-        private void AssertSameDescendantsOrder(string markdown)
+        private static void AssertIEnumerablesAreEqual<T>(IEnumerable<T> first, IEnumerable<T> second)
        {
-            var syntaxTree = Markdown.Parse(markdown, new MarkdownPipelineBuilder().UseAdvancedExtensions().Build());
+            var firstList = new List<T>(first);
+            var secondList = new List<T>(second);

-            var descendants_legacy = Descendants_Legacy(syntaxTree).ToList();
-            var descendants_new = syntaxTree.Descendants().ToList();
+            Assert.AreEqual(firstList.Count, secondList.Count);

-            Assert.AreEqual(descendants_legacy.Count, descendants_new.Count);
-
-            for (int i = 0; i < descendants_legacy.Count; i++)
+            for (int i = 0; i < firstList.Count; i++)
            {
-                Assert.AreSame(descendants_legacy[i], descendants_new[i]);
+                Assert.AreSame(firstList[i], secondList[i]);
            }
        }

--- a/src/Markdig.Tests/TestExceptionNotThrown.cs
+++ b/src/Markdig.Tests/TestExceptionNotThrown.cs
@@ -0,0 +1,48 @@
+using NUnit.Framework;
+
+namespace Markdig.Tests
+{
+    [TestFixture]
+    public class TestExceptionNotThrown
+    {
+        [Test]
+        public void DoesNotThrowIndexOutOfRangeException1()
+        {
+            Assert.DoesNotThrow(() =>
+            {
+                var pipeline = new MarkdownPipelineBuilder().UseAdvancedExtensions().Build();
+                Markdown.ToHtml("+-\n|\n+", pipeline);
+            });
+        }
+
+        [Test]
+        public void DoesNotThrowIndexOutOfRangeException2()
+        {
+            Assert.DoesNotThrow(() =>
+            {
+                var pipeline = new MarkdownPipelineBuilder().UseAdvancedExtensions().Build();
+                Markdown.ToHtml("+--\n|\n+0", pipeline);
+            });
+        }
+
+        [Test]
+        public void DoesNotThrowIndexOutOfRangeException3()
+        {
+            Assert.DoesNotThrow(() =>
+            {
+                var pipeline = new MarkdownPipelineBuilder().UseAdvancedExtensions().Build();
+                Markdown.ToHtml("+-\n|\n+\n0", pipeline);
+            });
+        }
+
+        [Test]
+        public void DoesNotThrowIndexOutOfRangeException4()
+        {
+            Assert.DoesNotThrow(() =>
+            {
+                var pipeline = new MarkdownPipelineBuilder().UseAdvancedExtensions().Build();
+                Markdown.ToHtml("+-\n|\n+0", pipeline);
+            });
+        }
+    }
+}
--- a/src/Markdig.Tests/TestLineReader.cs
+++ b/src/Markdig.Tests/TestLineReader.cs
@@ -1,4 +1,4 @@
-// Copyright (c) Alexandre Mutel. All rights reserved.
+// Copyright (c) Alexandre Mutel. All rights reserved.
 // This file is licensed under the BSD-Clause 2 license. 
 // See the license.txt file in the project root for more information.

@@ -18,60 +18,60 @@ namespace Markdig.Tests
        public void TestEmpty()
        {
            var lineReader = new LineReader("");
-            Assert.Null(lineReader.ReadLine()?.ToString());
+            Assert.Null(lineReader.ReadLine().Text);
        }

        [Test]
        public void TestLinesOnlyLf()
        {
            var lineReader = new LineReader("\n\n\n");
-            Assert.AreEqual(string.Empty, lineReader.ReadLine()?.ToString());
+            Assert.AreEqual(string.Empty, lineReader.ReadLine().ToString());
            Assert.AreEqual(1, lineReader.SourcePosition);
-            Assert.AreEqual(string.Empty, lineReader.ReadLine()?.ToString());
+            Assert.AreEqual(string.Empty, lineReader.ReadLine().ToString());
            Assert.AreEqual(2, lineReader.SourcePosition);
-            Assert.AreEqual(string.Empty, lineReader.ReadLine()?.ToString());
-            Assert.Null(lineReader.ReadLine()?.ToString());
+            Assert.AreEqual(string.Empty, lineReader.ReadLine().ToString());
+            Assert.Null(lineReader.ReadLine().Text);
        }

        [Test]
        public void TestLinesOnlyCr()
        {
            var lineReader = new LineReader("\r\r\r");
-            Assert.AreEqual(string.Empty, lineReader.ReadLine()?.ToString());
+            Assert.AreEqual(string.Empty, lineReader.ReadLine().ToString());
            Assert.AreEqual(1, lineReader.SourcePosition);
-            Assert.AreEqual(string.Empty, lineReader.ReadLine()?.ToString());
+            Assert.AreEqual(string.Empty, lineReader.ReadLine().ToString());
            Assert.AreEqual(2, lineReader.SourcePosition);
-            Assert.AreEqual(string.Empty, lineReader.ReadLine()?.ToString());
-            Assert.Null(lineReader.ReadLine()?.ToString());
+            Assert.AreEqual(string.Empty, lineReader.ReadLine().ToString());
+            Assert.Null(lineReader.ReadLine().Text);
        }

        [Test]
        public void TestLinesOnlyCrLf()
        {
            var lineReader = new LineReader("\r\n\r\n\r\n");
-            Assert.AreEqual(string.Empty, lineReader.ReadLine()?.ToString());
+            Assert.AreEqual(string.Empty, lineReader.ReadLine().ToString());
            Assert.AreEqual(2, lineReader.SourcePosition);
-            Assert.AreEqual(string.Empty, lineReader.ReadLine()?.ToString());
+            Assert.AreEqual(string.Empty, lineReader.ReadLine().ToString());
            Assert.AreEqual(4, lineReader.SourcePosition);
-            Assert.AreEqual(string.Empty, lineReader.ReadLine()?.ToString());
-            Assert.Null(lineReader.ReadLine()?.ToString());
+            Assert.AreEqual(string.Empty, lineReader.ReadLine().ToString());
+            Assert.Null(lineReader.ReadLine().Text);
        }

        [Test]
        public void TestNoEndOfLine()
        {
            var lineReader = new LineReader("123");
-            Assert.AreEqual("123", lineReader.ReadLine()?.ToString());
-            Assert.Null(lineReader.ReadLine()?.ToString());
+            Assert.AreEqual("123", lineReader.ReadLine().ToString());
+            Assert.Null(lineReader.ReadLine().Text);
        }

        [Test]
        public void TestLf()
        {
            var lineReader = new LineReader("123\n");
-            Assert.AreEqual("123", lineReader.ReadLine()?.ToString());
+            Assert.AreEqual("123", lineReader.ReadLine().ToString());
            Assert.AreEqual(4, lineReader.SourcePosition);
-            Assert.Null(lineReader.ReadLine()?.ToString());
+            Assert.Null(lineReader.ReadLine().Text);
        }

        [Test]
@@ -79,29 +79,29 @@ namespace Markdig.Tests
        {
            // When limited == true, we limit the internal buffer exactly after the first new line char '\n'
            var lineReader = new LineReader("123\n456");
-            Assert.AreEqual("123", lineReader.ReadLine()?.ToString());
+            Assert.AreEqual("123", lineReader.ReadLine().ToString());
            Assert.AreEqual(4, lineReader.SourcePosition);
-            Assert.AreEqual("456", lineReader.ReadLine()?.ToString());
-            Assert.Null(lineReader.ReadLine()?.ToString());
+            Assert.AreEqual("456", lineReader.ReadLine().ToString());
+            Assert.Null(lineReader.ReadLine().Text);
        }

        [Test]
        public void TestCr()
        {
            var lineReader = new LineReader("123\r");
-            Assert.AreEqual("123", lineReader.ReadLine()?.ToString());
+            Assert.AreEqual("123", lineReader.ReadLine().ToString());
            Assert.AreEqual(4, lineReader.SourcePosition);
-            Assert.Null(lineReader.ReadLine()?.ToString());
+            Assert.Null(lineReader.ReadLine().Text);
        }

        [Test]
        public void TestCr2()
        {
            var lineReader = new LineReader("123\r456");
-            Assert.AreEqual("123", lineReader.ReadLine()?.ToString());
+            Assert.AreEqual("123", lineReader.ReadLine().ToString());
            Assert.AreEqual(4, lineReader.SourcePosition);
-            Assert.AreEqual("456", lineReader.ReadLine()?.ToString());
-            Assert.Null(lineReader.ReadLine()?.ToString());
+            Assert.AreEqual("456", lineReader.ReadLine().ToString());
+            Assert.Null(lineReader.ReadLine().Text);
        }

        [Test]
@@ -110,19 +110,19 @@ namespace Markdig.Tests
            // When limited == true, we limit the internal buffer exactly after the first new line char '\r'
            // and we check that we don't get a new line for `\n` 
            var lineReader = new LineReader("123\r\n");
-            Assert.AreEqual("123", lineReader.ReadLine()?.ToString());
+            Assert.AreEqual("123", lineReader.ReadLine().ToString());
            Assert.AreEqual(5, lineReader.SourcePosition);
-            Assert.Null(lineReader.ReadLine()?.ToString());
+            Assert.Null(lineReader.ReadLine().Text);
        }

        [Test]
        public void TestCrLf2()
        {
            var lineReader = new LineReader("123\r\n456");
-            Assert.AreEqual("123", lineReader.ReadLine()?.ToString());
+            Assert.AreEqual("123", lineReader.ReadLine().ToString());
            Assert.AreEqual(5, lineReader.SourcePosition);
-            Assert.AreEqual("456", lineReader.ReadLine()?.ToString());
-            Assert.Null(lineReader.ReadLine()?.ToString());
+            Assert.AreEqual("456", lineReader.ReadLine().ToString());
+            Assert.Null(lineReader.ReadLine().Text);
        }
    }
 }
--- a/src/Markdig.Tests/TestLinkHelper.cs
+++ b/src/Markdig.Tests/TestLinkHelper.cs
@@ -322,6 +322,16 @@ namespace Markdig.Tests
            Assert.AreEqual(expectedResult, LinkHelper.Urilize(input, false));
        }

+        [TestCase("Header identifiers in HTML", "header-identifiers-in-html")]
+        [TestCase("* Dogs*?--in *my* house?", "-dogs--in-my-house")]
+        [TestCase("[HTML], [S5], or [RTF]?", "html-s5-or-rtf")]
+        [TestCase("3. Applications", "3-applications")]
+        [TestCase("33", "33")]
+        public void TestUrilizeGfm(string input, string expectedResult)
+        {
+            Assert.AreEqual(expectedResult, LinkHelper.UrilizeAsGfm(input));
+        }
+
        [TestCase("abc", "abc")]
        [TestCase("a-c", "a-c")]
        [TestCase("a c", "a-c")]
--- a/src/Markdig.Tests/TestMarkdigCoreApi.cs
+++ b/src/Markdig.Tests/TestMarkdigCoreApi.cs
@@ -0,0 +1,148 @@
+using Markdig.Renderers;
+using Markdig.Syntax;
+using Markdig.Syntax.Inlines;
+using NUnit.Framework;
+using System.IO;
+
+namespace Markdig.Tests
+{
+    public class TestMarkdigCoreApi
+    {
+        [Test]
+        public void TestToHtml()
+        {
+            string html = Markdown.ToHtml("This is a text with some *emphasis*");
+            Assert.AreEqual("<p>This is a text with some <em>emphasis</em></p>\n", html);
+
+            html = Markdown.ToHtml("This is a text with a https://link.tld/");
+            Assert.AreNotEqual("<p>This is a text with a <a href=\"https://link.tld/\">https://link.tld/</a></p>\n", html);
+        }
+
+        [Test]
+        public void TestToHtmlWithPipeline()
+        {
+            var pipeline = new MarkdownPipelineBuilder()
+                .Build();
+
+            string html = Markdown.ToHtml("This is a text with some *emphasis*", pipeline);
+            Assert.AreEqual("<p>This is a text with some <em>emphasis</em></p>\n", html);
+
+            html = Markdown.ToHtml("This is a text with a https://link.tld/", pipeline);
+            Assert.AreNotEqual("<p>This is a text with a <a href=\"https://link.tld/\">https://link.tld/</a></p>\n", html);
+
+            pipeline = new MarkdownPipelineBuilder()
+                .UseAdvancedExtensions()
+                .Build();
+
+            html = Markdown.ToHtml("This is a text with a https://link.tld/", pipeline);
+            Assert.AreEqual("<p>This is a text with a <a href=\"https://link.tld/\">https://link.tld/</a></p>\n", html);
+        }
+
+        [Test]
+        public void TestToHtmlWithWriter()
+        {
+            StringWriter writer = new StringWriter();
+
+            _ = Markdown.ToHtml("This is a text with some *emphasis*", writer);
+            string html = writer.ToString();
+            Assert.AreEqual("<p>This is a text with some <em>emphasis</em></p>\n", html);
+
+            writer = new StringWriter();
+            var pipeline = new MarkdownPipelineBuilder()
+                .UseAdvancedExtensions()
+                .Build();
+
+            _ = Markdown.ToHtml("This is a text with a https://link.tld/", writer, pipeline);
+            html = writer.ToString();
+            Assert.AreEqual("<p>This is a text with a <a href=\"https://link.tld/\">https://link.tld/</a></p>\n", html);
+
+        }
+
+        [Test]
+        public void TestConvert()
+        {
+            StringWriter writer = new StringWriter();
+            HtmlRenderer renderer = new HtmlRenderer(writer);
+
+            _ = Markdown.Convert("This is a text with some *emphasis*", renderer);
+            string html = writer.ToString();
+            Assert.AreEqual("<p>This is a text with some <em>emphasis</em></p>\n", html);
+
+            writer = new StringWriter();
+            renderer = new HtmlRenderer(writer);
+            var pipeline = new MarkdownPipelineBuilder()
+                .UseAdvancedExtensions()
+                .Build();
+
+            _ = Markdown.Convert("This is a text with a https://link.tld/", renderer, pipeline);
+            html = writer.ToString();
+            Assert.AreEqual("<p>This is a text with a <a href=\"https://link.tld/\">https://link.tld/</a></p>\n", html);
+        }
+
+        [Test]
+        public void TestParse()
+        {
+            const string markdown = "This is a text with some *emphasis*";
+
+            var pipeline = new MarkdownPipelineBuilder()
+                .UsePreciseSourceLocation()
+                .Build();
+
+            MarkdownDocument document = Markdown.Parse(markdown, pipeline);
+
+            Assert.AreEqual(1, document.LineCount);
+            Assert.AreEqual(markdown.Length, document.Span.Length);
+            Assert.AreEqual(1, document.LineStartIndexes.Count);
+            Assert.AreEqual(0, document.LineStartIndexes[0]);
+
+            Assert.AreEqual(1, document.Count);
+            ParagraphBlock paragraph = document[0] as ParagraphBlock;
+            Assert.NotNull(paragraph);
+            Assert.AreEqual(markdown.Length, paragraph.Span.Length);
+            LiteralInline literal = paragraph.Inline.FirstChild as LiteralInline;
+            Assert.NotNull(literal);
+            Assert.AreEqual("This is a text with some ", literal.ToString());
+            EmphasisInline emphasis = literal.NextSibling as EmphasisInline;
+            Assert.NotNull(emphasis);
+            Assert.AreEqual("*emphasis*".Length, emphasis.Span.Length);
+            LiteralInline emphasisLiteral = emphasis.FirstChild as LiteralInline;
+            Assert.NotNull(emphasisLiteral);
+            Assert.AreEqual("emphasis", emphasisLiteral.ToString());
+            Assert.Null(emphasisLiteral.NextSibling);
+            Assert.Null(emphasis.NextSibling);
+        }
+
+        [Test]
+        public void TestNormalize()
+        {
+            string normalized = Markdown.Normalize("Heading\n=======");
+            Assert.AreEqual("# Heading", normalized);
+        }
+
+        public void TestNormalizeWithWriter()
+        {
+            StringWriter writer = new StringWriter();
+
+            _ = Markdown.Normalize("Heading\n=======", writer);
+            string normalized = writer.ToString();
+            Assert.AreEqual("# Heading", normalized);
+        }
+
+        [Test]
+        public void TestToPlainText()
+        {
+            string plainText = Markdown.ToPlainText("*Hello*, [world](http://example.com)!");
+            Assert.AreEqual("Hello, world!\n", plainText);
+        }
+
+        [Test]
+        public void TestToPlainTextWithWriter()
+        {
+            StringWriter writer = new StringWriter();
+
+            _ = Markdown.ToPlainText("*Hello*, [world](http://example.com)!", writer);
+            string plainText = writer.ToString();
+            Assert.AreEqual("Hello, world!\n", plainText);
+        }
+    }
+}
--- a/src/Markdig.Tests/TestMediaLinks.cs
+++ b/src/Markdig.Tests/TestMediaLinks.cs
@@ -0,0 +1,87 @@
+using Markdig.Extensions.MediaLinks;
+using NUnit.Framework;
+using System;
+using System.Text.RegularExpressions;
+
+namespace Markdig.Tests
+{
+    [TestFixture]
+    public class TestMediaLinks
+    {
+        private MarkdownPipeline GetPipeline(MediaOptions options = null)
+        {
+            return new MarkdownPipelineBuilder()
+                 .UseMediaLinks(options)
+                 .Build();
+        }
+
+        [Test]
+        [TestCase("![static mp4](https://sample.com/video.mp4)", "<p><video width=\"500\" height=\"281\" controls=\"\"><source type=\"video/mp4\" src=\"https://sample.com/video.mp4\"></source></video></p>\n")]
+        [TestCase("![static mp4](//sample.com/video.mp4)", "<p><video width=\"500\" height=\"281\" controls=\"\"><source type=\"video/mp4\" src=\"//sample.com/video.mp4\"></source></video></p>\n")]
+        [TestCase(@"![youtube.com](https://www.youtube.com/watch?v=mswPy5bt3TQ)", "<p><iframe src=\"https://www.youtube.com/embed/mswPy5bt3TQ\" width=\"500\" height=\"281\" class=\"youtube\" frameborder=\"0\" allowfullscreen=\"\"></iframe></p>\n")]
+        [TestCase("![yandex.ru](https://music.yandex.ru/album/411845/track/4402274)", "<p><iframe src=\"https://music.yandex.ru/iframe/#track/4402274/411845/\" width=\"500\" height=\"281\" class=\"yandex\" frameborder=\"0\"></iframe></p>\n")]
+        [TestCase("![vimeo](https://vimeo.com/8607834)", "<p><iframe src=\"https://player.vimeo.com/video/8607834\" width=\"500\" height=\"281\" class=\"vimeo\" frameborder=\"0\" allowfullscreen=\"\"></iframe></p>\n")]
+        [TestCase("![ok.ru](https://ok.ru/video/26870090463)", "<p><iframe src=\"https://ok.ru/videoembed/26870090463\" width=\"500\" height=\"281\" class=\"odnoklassniki\" frameborder=\"0\" allowfullscreen=\"\"></iframe></p>\n")]
+        [TestCase("![ok.ru](//ok.ru/video/26870090463)", "<p><iframe src=\"https://ok.ru/videoembed/26870090463\" width=\"500\" height=\"281\" class=\"odnoklassniki\" frameborder=\"0\" allowfullscreen=\"\"></iframe></p>\n")]
+        public void TestBuiltInHosts(string markdown, string expected)
+        {
+            string html = Markdown.ToHtml(markdown, GetPipeline());
+            Assert.AreEqual(html, expected);
+        }
+
+        private class TestHostProvider : IHostProvider
+        {
+            public string Class { get; } = "regex";
+            public bool AllowFullScreen { get; }
+
+            public bool TryHandle(Uri mediaUri, bool isSchemaRelative, out string iframeUrl)
+            {
+                iframeUrl = null;
+                var uri = isSchemaRelative ? "//" + mediaUri.GetComponents(UriComponents.AbsoluteUri & ~UriComponents.Scheme, UriFormat.UriEscaped) : mediaUri.ToString();
+                if (!matcher.IsMatch(uri))
+                    return false;
+                iframeUrl = matcher.Replace(uri, replacement);
+                return true;
+            }
+
+            private Regex matcher;
+            private string replacement;
+
+            public TestHostProvider(string provider, string replace)
+            {
+                matcher = new Regex(provider);
+                replacement = replace;
+            }
+        }
+
+        [Test]
+        [TestCase("![p1](https://sample.com/video.mp4)", "<p><iframe src=\"https://example.com/video.mp4\" width=\"500\" height=\"281\" class=\"regex\" frameborder=\"0\"></iframe></p>\n", @"^https?://sample.com/(.+)$", @"https://example.com/$1")]
+        [TestCase("![p1](//sample.com/video.mp4)", "<p><iframe src=\"https://example.com/video.mp4\" width=\"500\" height=\"281\" class=\"regex\" frameborder=\"0\"></iframe></p>\n", @"^//sample.com/(.+)$", @"https://example.com/$1")]
+        [TestCase("![p1](https://sample.com/video.mp4)", "<p><iframe src=\"https://example.com/video.mp4?token=aaabbb\" width=\"500\" height=\"281\" class=\"regex\" frameborder=\"0\"></iframe></p>\n", @"^https?://sample.com/(.+)$", @"https://example.com/$1?token=aaabbb")]
+        public void TestCustomHostProvider(string markdown, string expected, string provider, string replace)
+        {
+            string html = Markdown.ToHtml(markdown, GetPipeline(new MediaOptions
+            {
+                Hosts =
+                {
+                    new TestHostProvider(provider, replace),
+                }
+            }));
+            Assert.AreEqual(html, expected);
+        }
+
+        [Test]
+        [TestCase("![static mp4](//sample.com/video.mp4)", "<p><video width=\"500\" height=\"281\" controls=\"\"><source type=\"video/mp4\" src=\"//sample.com/video.mp4\"></source></video></p>\n", "")]
+        [TestCase(@"![youtube.com](https://www.youtube.com/watch?v=mswPy5bt3TQ)", "<p><iframe src=\"https://www.youtube.com/embed/mswPy5bt3TQ\" width=\"500\" height=\"281\" class=\"youtube\" frameborder=\"0\" allowfullscreen=\"\"></iframe></p>\n", "")]
+        [TestCase("![static mp4](//sample.com/video.mp4)", "<p><video width=\"500\" height=\"281\" controls=\"\" class=\"k\"><source type=\"video/mp4\" src=\"//sample.com/video.mp4\"></source></video></p>\n", "k")]
+        [TestCase(@"![youtube.com](https://www.youtube.com/watch?v=mswPy5bt3TQ)", "<p><iframe src=\"https://www.youtube.com/embed/mswPy5bt3TQ\" width=\"500\" height=\"281\" class=\"k youtube\" frameborder=\"0\" allowfullscreen=\"\"></iframe></p>\n", "k")]
+        public void TestCustomClass(string markdown, string expected, string klass)
+        {
+            string html = Markdown.ToHtml(markdown, GetPipeline(new MediaOptions
+            {
+                Class = klass,
+            }));
+            Assert.AreEqual(html, expected);
+        }
+    }
+}
--- a/src/Markdig.Tests/TestParser.cs
+++ b/src/Markdig.Tests/TestParser.cs
@@ -8,6 +8,7 @@ using System.Linq;
 using System.Text;
 using System.Text.RegularExpressions;
 using Markdig.Extensions.JiraLinks;
+using Markdig.Syntax;
 using NUnit.Framework;

 namespace Markdig.Tests
@@ -151,8 +152,20 @@ namespace Markdig.Tests
        /// Contains the markdown source for specification files (order is the same as in <see cref="SpecsFilePaths"/>)
        /// </summary>
        public static readonly string[] SpecsMarkdown;
+        /// <summary>
+        /// Contains the markdown syntax tree for specification files (order is the same as in <see cref="SpecsFilePaths"/>)
+        /// </summary>
+        public static readonly MarkdownDocument[] SpecsSyntaxTrees;
+
        static TestParser()
        {
+            const string RunningInsideVisualStudioPath = "\\src\\.vs\\markdig\\";
+            int index = TestsDirectory.IndexOf(RunningInsideVisualStudioPath);
+            if (index != -1)
+            {
+                TestsDirectory = TestsDirectory.Substring(0, index) + "\\src\\Markdig.Tests";
+            }
+
            SpecsFilePaths = Directory.GetDirectories(TestsDirectory)
                .Where(dir => dir.EndsWith("Specs"))
                .SelectMany(dir => Directory.GetFiles(dir)
@@ -161,10 +174,16 @@ namespace Markdig.Tests
                .ToArray();

            SpecsMarkdown = new string[SpecsFilePaths.Length];
+            SpecsSyntaxTrees = new MarkdownDocument[SpecsFilePaths.Length];
+
+            var pipeline = new MarkdownPipelineBuilder()
+                .UseAdvancedExtensions()
+                .Build();

            for (int i = 0; i < SpecsFilePaths.Length; i++)
            {
-                SpecsMarkdown[i] = File.ReadAllText(SpecsFilePaths[i]);
+                string markdown = SpecsMarkdown[i] = File.ReadAllText(SpecsFilePaths[i]);
+                SpecsSyntaxTrees[i] = Markdown.Parse(markdown, pipeline);
            }
        }
    }
--- a/src/Markdig.Tests/TestPlayParser.cs
+++ b/src/Markdig.Tests/TestPlayParser.cs
@@ -1,5 +1,5 @@
 // Copyright (c) Alexandre Mutel. All rights reserved.
-// This file is licensed under the BSD-Clause 2 license. 
+// This file is licensed under the BSD-Clause 2 license.
 // See the license.txt file in the project root for more information.
 using System;
 using System.Linq;
@@ -19,7 +19,7 @@ namespace Markdig.Tests
            var link = doc.Descendants<ParagraphBlock>().SelectMany(x => x.Inline.Descendants<LinkInline>()).FirstOrDefault(l => l.IsImage);
            Assert.AreEqual("/yoyo", link?.Url);
        }
-        
+
        [Test]
        public void TestListBug2()
        {
@@ -53,11 +53,11 @@ Later in a text we are using HTML and it becomes an abbr tag HTML
        [Test]
        public void TestEmptyLiteral()
        {
-            var text = @"> *some text* 
+            var text = @"> *some text*
 > some other text";
            var doc = Markdown.Parse(text);

-            Assert.True(doc.Descendants().OfType<LiteralInline>().All(x => !x.Content.IsEmpty),
+            Assert.True(doc.Descendants<LiteralInline>().All(x => !x.Content.IsEmpty),
                "There should not have any empty literals");
        }

@@ -195,8 +195,8 @@ Paragraph
 ";

            var expected = @"<table class=""table"">
-<col style=""width:50%"">
-<col style=""width:50%"">
+<col style=""width:50%"" />
+<col style=""width:50%"" />
 <thead>
 <tr>
 <th>a</th>
@@ -219,7 +219,7 @@ Paragraph
        {
            var pipeline = new MarkdownPipelineBuilder().UseAdvancedExtensions().Build();

-            // Reuse the same pipeline 
+            // Reuse the same pipeline
            var result1 = Markdown.ToHtml("This is a \"\"citation\"\"", pipeline);
            var result2 = Markdown.ToHtml("This is a \"\"citation\"\"", pipeline);

@@ -269,7 +269,7 @@ Paragraph
        //| Yes                               |
        //| ```                               |
        //+===================================+======================================+
-        //| This is a second line             | 
+        //| This is a second line             |
        //+-----------------------------------+--------------------------------------+

        //:::spoiler  {#yessss}
--- a/src/Markdig.Tests/TestSmartyPants.cs
+++ b/src/Markdig.Tests/TestSmartyPants.cs
@@ -0,0 +1,36 @@
+using Markdig.Extensions.SmartyPants;
+using NUnit.Framework;
+
+namespace Markdig.Tests
+{
+    public class TestSmartyPants
+    {
+        [Test]
+        public void MappingCanBeReconfigured()
+        {
+            SmartyPantOptions options = new SmartyPantOptions();
+            options.Mapping[SmartyPantType.LeftAngleQuote] = "foo";
+            options.Mapping[SmartyPantType.RightAngleQuote] = "bar";
+
+            var pipeline = new MarkdownPipelineBuilder()
+                .UseSmartyPants(options)
+                .Build();
+
+            TestParser.TestSpec("<<test>>", "<p>footestbar</p>", pipeline);
+        }
+
+        [Test]
+        public void MappingCanBeReconfigured_HandlesRemovedMappings()
+        {
+            SmartyPantOptions options = new SmartyPantOptions();
+            options.Mapping.Remove(SmartyPantType.LeftAngleQuote);
+            options.Mapping.Remove(SmartyPantType.RightAngleQuote);
+
+            var pipeline = new MarkdownPipelineBuilder()
+                .UseSmartyPants(options)
+                .Build();
+
+            TestParser.TestSpec("<<test>>", "<p>&laquo;test&raquo;</p>", pipeline);
+        }
+    }
+}
--- a/src/Markdig.Tests/TestSourcePosition.cs
+++ b/src/Markdig.Tests/TestSourcePosition.cs
@@ -6,8 +6,7 @@ using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
-using Markdig.Extensions.Footnotes;
-using Markdig.Helpers;
+using Markdig.Extensions.Footnotes;
 using Markdig.Renderers.Html;
 using Markdig.Syntax;
 using Markdig.Syntax.Inlines;
@@ -147,7 +146,7 @@ literal      ( 0, 6)  6-7
        public void TestFootnoteLinkReferenceDefinition()
        {
            //                             01 2 345678
-            var footnote = Markdown.Parse("0\n\n [^1]:", new MarkdownPipelineBuilder().UsePreciseSourceLocation().UseFootnotes().Build()).Descendants().OfType<FootnoteLinkReferenceDefinition>().FirstOrDefault();
+            var footnote = Markdown.Parse("0\n\n [^1]:", new MarkdownPipelineBuilder().UsePreciseSourceLocation().UseFootnotes().Build()).Descendants<FootnoteLinkReferenceDefinition>().FirstOrDefault();
            Assert.NotNull(footnote);

            Assert.AreEqual(2, footnote.Line);
@@ -160,7 +159,7 @@ literal      ( 0, 6)  6-7
        {
            //                         0         1
            //                         0123456789012345
-            var link = Markdown.Parse("[234]: /56 'yo' ", new MarkdownPipelineBuilder().UsePreciseSourceLocation().Build()).Descendants().OfType<LinkReferenceDefinition>().FirstOrDefault();
+            var link = Markdown.Parse("[234]: /56 'yo' ", new MarkdownPipelineBuilder().UsePreciseSourceLocation().Build()).Descendants<LinkReferenceDefinition>().FirstOrDefault();
            Assert.NotNull(link);

            Assert.AreEqual(0, link.Line);
@@ -175,7 +174,7 @@ literal      ( 0, 6)  6-7
        {
            //                         0          1
            //                         01 2 34567890123456789
-            var link = Markdown.Parse("0\n\n [234]: /56 'yo' ", new MarkdownPipelineBuilder().UsePreciseSourceLocation().Build()).Descendants().OfType<LinkReferenceDefinition>().FirstOrDefault();
+            var link = Markdown.Parse("0\n\n [234]: /56 'yo' ", new MarkdownPipelineBuilder().UsePreciseSourceLocation().Build()).Descendants<LinkReferenceDefinition>().FirstOrDefault();
            Assert.NotNull(link);

            Assert.AreEqual(2, link.Line);
@@ -213,7 +212,7 @@ literal      ( 0, 4)  4-5
        {
            //                         0           1
            //                         01 2 3456789012345
-            var link = Markdown.Parse("0\n\n01 [234](/56)", new MarkdownPipelineBuilder().UsePreciseSourceLocation().Build()).Descendants().OfType<LinkInline>().FirstOrDefault();
+            var link = Markdown.Parse("0\n\n01 [234](/56)", new MarkdownPipelineBuilder().UsePreciseSourceLocation().Build()).Descendants<LinkInline>().FirstOrDefault();
            Assert.NotNull(link);

            Assert.AreEqual(new SourceSpan(7, 9), link.LabelSpan);
@@ -226,7 +225,7 @@ literal      ( 0, 4)  4-5
        {
            //                         0           1
            //                         01 2 34567890123456789
-            var link = Markdown.Parse("0\n\n01 [234](/56 'yo')", new MarkdownPipelineBuilder().UsePreciseSourceLocation().Build()).Descendants().OfType<LinkInline>().FirstOrDefault();
+            var link = Markdown.Parse("0\n\n01 [234](/56 'yo')", new MarkdownPipelineBuilder().UsePreciseSourceLocation().Build()).Descendants<LinkInline>().FirstOrDefault();
            Assert.NotNull(link);

            Assert.AreEqual(new SourceSpan(7, 9), link.LabelSpan);
@@ -240,7 +239,7 @@ literal      ( 0, 4)  4-5
        {
            //                         0           1
            //                         01 2 3456789012345
-            var link = Markdown.Parse("0\n\n01![234](/56)", new MarkdownPipelineBuilder().UsePreciseSourceLocation().Build()).Descendants().OfType<LinkInline>().FirstOrDefault();
+            var link = Markdown.Parse("0\n\n01![234](/56)", new MarkdownPipelineBuilder().UsePreciseSourceLocation().Build()).Descendants<LinkInline>().FirstOrDefault();
            Assert.NotNull(link);

            Assert.AreEqual(new SourceSpan(5, 15), link.Span);
@@ -408,7 +407,7 @@ literal      ( 1, 2)  6-6
 6. Bar
 987123. FooBar";
            test = test.Replace("\r\n", "\n");
-            var list = Markdown.Parse(test, new MarkdownPipelineBuilder().UsePreciseSourceLocation().Build()).Descendants().OfType<ListBlock>().FirstOrDefault();
+            var list = Markdown.Parse(test, new MarkdownPipelineBuilder().UsePreciseSourceLocation().Build()).Descendants<ListBlock>().FirstOrDefault();
            Assert.NotNull(list);

            Assert.AreEqual(1, list.Line);
--- a/src/Markdig.Tests/TestStringSliceList.cs
+++ b/src/Markdig.Tests/TestStringSliceList.cs
@@ -3,6 +3,7 @@ using System.Collections.Generic;
 using System.Text;
 using Markdig.Helpers;
 using Markdig.Syntax;
+using System;

 namespace Markdig.Tests
 {
@@ -27,6 +28,8 @@ namespace Markdig.Tests

            var chars = ToString(text.ToCharIterator());
            TextAssert.AreEqual("ABC\nE\nF", chars.ToString());
+
+            TextAssert.AreEqual("ABC\nE\nF", text.ToString());
        }

        [Test]
@@ -126,5 +129,31 @@ namespace Markdig.Tests
            var result = ToString(text);
            TextAssert.AreEqual("ABC  \n  DEF ", result);
        }
+
+        [Test]
+        public void TestStringLineGroupIteratorPeekChar()
+        {
+            var iterator = new StringLineGroup(4)
+            {
+                new StringSlice("ABC"),
+                new StringSlice("E"),
+                new StringSlice("F")
+            }.ToCharIterator();
+
+            Assert.AreEqual('A', iterator.CurrentChar);
+            Assert.AreEqual('A', iterator.PeekChar(0));
+            Assert.AreEqual('B', iterator.PeekChar());
+            Assert.AreEqual('B', iterator.PeekChar(1));
+            Assert.AreEqual('C', iterator.PeekChar(2));
+            Assert.AreEqual('\n', iterator.PeekChar(3));
+            Assert.AreEqual('E', iterator.PeekChar(4));
+            Assert.AreEqual('\n', iterator.PeekChar(5));
+            Assert.AreEqual('F', iterator.PeekChar(6));
+            Assert.AreEqual('\0', iterator.PeekChar(7)); // There is no \n appended to the last line
+            Assert.AreEqual('\0', iterator.PeekChar(8));
+            Assert.AreEqual('\0', iterator.PeekChar(100));
+
+            Assert.Throws<ArgumentOutOfRangeException>(() => iterator.PeekChar(-1));
+        }
    }
 }
--- a/src/Markdig.WebApp/Markdig.WebApp.csproj
+++ b/src/Markdig.WebApp/Markdig.WebApp.csproj
@@ -9,6 +9,7 @@
    <RuntimeFrameworkVersion>2.0.0</RuntimeFrameworkVersion>
    <ApplicationInsightsResourceId>/subscriptions/b6745039-70e7-4641-994b-5457cb220e2a/resourcegroups/Default-ApplicationInsights-EastUS/providers/microsoft.insights/components/Markdig.WebApp</ApplicationInsightsResourceId>
    <ApplicationInsightsAnnotationResourceId>/subscriptions/b6745039-70e7-4641-994b-5457cb220e2a/resourcegroups/Default-ApplicationInsights-EastUS/providers/microsoft.insights/components/Markdig.WebApp</ApplicationInsightsAnnotationResourceId>
+    <IsPackable>false</IsPackable>
  </PropertyGroup>

  <ItemGroup>
@@ -22,16 +23,16 @@
  </ItemGroup>

  <ItemGroup>
-    <PackageReference Include="Microsoft.ApplicationInsights.AspNetCore" Version="2.1.1" />
-    <PackageReference Include="Microsoft.AspNetCore.Mvc" Version="2.0.0" />
-    <PackageReference Include="Microsoft.AspNetCore.Server.IISIntegration" Version="2.0.0" />
-    <PackageReference Include="Microsoft.AspNetCore.Server.Kestrel" Version="2.0.0" />
-    <PackageReference Include="Microsoft.Extensions.Configuration.EnvironmentVariables" Version="2.0.0" />
-    <PackageReference Include="Microsoft.Extensions.Configuration.FileExtensions" Version="2.0.0" />
-    <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="2.0.0" />
-    <PackageReference Include="Microsoft.Extensions.Logging" Version="2.0.0" />
-    <PackageReference Include="Microsoft.Extensions.Logging.Console" Version="2.0.0" />
-    <PackageReference Include="Microsoft.Extensions.Logging.Debug" Version="2.0.0" />
+    <PackageReference Include="Microsoft.ApplicationInsights.AspNetCore" Version="2.12.0" />
+    <PackageReference Include="Microsoft.AspNetCore.Mvc" Version="2.2.0" />
+    <PackageReference Include="Microsoft.AspNetCore.Server.IISIntegration" Version="2.2.1" />
+    <PackageReference Include="Microsoft.AspNetCore.Server.Kestrel" Version="2.2.0" />
+    <PackageReference Include="Microsoft.Extensions.Configuration.EnvironmentVariables" Version="3.1.1" />
+    <PackageReference Include="Microsoft.Extensions.Configuration.FileExtensions" Version="3.1.1" />
+    <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="3.1.1" />
+    <PackageReference Include="Microsoft.Extensions.Logging" Version="3.1.1" />
+    <PackageReference Include="Microsoft.Extensions.Logging.Console" Version="3.1.1" />
+    <PackageReference Include="Microsoft.Extensions.Logging.Debug" Version="3.1.1" />
  </ItemGroup>

  <ItemGroup>
--- a/src/Markdig.WebApp/Startup.cs
+++ b/src/Markdig.WebApp/Startup.cs
@@ -43,8 +43,8 @@ namespace Markdig.WebApp
        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline
        public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
        {
-            loggerFactory.AddConsole(Configuration.GetSection("Logging"));
-            loggerFactory.AddDebug();
+            //loggerFactory.AddConsole(Configuration.GetSection("Logging"));
+            //loggerFactory.AddDebug();

            app.UseMvc();
        }
--- a/src/Markdig/Extensions/Bootstrap/BootstrapExtension.cs
+++ b/src/Markdig/Extensions/Bootstrap/BootstrapExtension.cs
@@ -1,4 +1,4 @@
-// Copyright (c) Alexandre Mutel. All rights reserved.
+// Copyright (c) Alexandre Mutel. All rights reserved.
 // This file is licensed under the BSD-Clause 2 license. 
 // See the license.txt file in the project root for more information.

@@ -51,8 +51,7 @@ namespace Markdig.Extensions.Bootstrap
                }
                else if (node is Inline)
                {
-                    var link = node as LinkInline;
-                    if (link != null && link.IsImage)
+                    if (node is LinkInline link && link.IsImage)
                    {
                        link.GetAttributes().AddClass("img-fluid");
                    }
--- a/src/Markdig/Extensions/Emoji/EmojiExtension.cs
+++ b/src/Markdig/Extensions/Emoji/EmojiExtension.cs
@@ -7,24 +7,24 @@ using Markdig.Renderers;
 namespace Markdig.Extensions.Emoji
 {
    /// <summary>
-    /// Extension to allow emoji and smiley replacement.
+    /// Extension to allow emoji shortcodes and smileys replacement.
    /// </summary>
    /// <seealso cref="Markdig.IMarkdownExtension" />
    public class EmojiExtension : IMarkdownExtension
    {
-        public EmojiExtension(bool enableSmiley = true)
-        {
-            EnableSmiley = enableSmiley;
+        public EmojiExtension(EmojiMapping emojiMapping)
+        {
+            EmojiMapping = emojiMapping;
        }
-
-        public bool EnableSmiley { get; set; }
-
+
+        public EmojiMapping EmojiMapping { get; }
+
        public void Setup(MarkdownPipelineBuilder pipeline)
        {
            if (!pipeline.InlineParsers.Contains<EmojiParser>())
            {
                // Insert the parser before any other parsers
-                pipeline.InlineParsers.Insert(0, new EmojiParser(EnableSmiley));
+                pipeline.InlineParsers.Insert(0, new EmojiParser(EmojiMapping));
            }
        }

--- a/src/Markdig/Extensions/Emoji/EmojiInline.cs
+++ b/src/Markdig/Extensions/Emoji/EmojiInline.cs
@@ -1,4 +1,4 @@
-// Copyright (c) Alexandre Mutel. All rights reserved.
+// Copyright (c) Alexandre Mutel. All rights reserved.
 // This file is licensed under the BSD-Clause 2 license. 
 // See the license.txt file in the project root for more information.

@@ -8,7 +8,7 @@ using Markdig.Syntax.Inlines;
 namespace Markdig.Extensions.Emoji
 {
    /// <summary>
-    /// An emoji inline 
+    /// An emoji inline.
    /// </summary>
    /// <seealso cref="Markdig.Syntax.Inlines.Inline" />
    public class EmojiInline : LiteralInline
@@ -32,7 +32,7 @@ namespace Markdig.Extensions.Emoji
        }

        /// <summary>
-        /// Gets or sets the original match string (either an emoji or a text smiley)
+        /// Gets or sets the original match string (either an emoji shortcode or a text smiley)
        /// </summary>
        public string Match { get; set; }
    }
--- a/src/Markdig/Extensions/Emoji/EmojiMapping.cs
+++ b/src/Markdig/Extensions/Emoji/EmojiMapping.cs
--- a/src/Markdig/Extensions/Emoji/EmojiParser.cs
+++ b/src/Markdig/Extensions/Emoji/EmojiParser.cs
--- a/src/Markdig/Extensions/Globalization/GlobalizationExtension.cs
+++ b/src/Markdig/Extensions/Globalization/GlobalizationExtension.cs
@@ -38,7 +38,7 @@ namespace Markdig.Extensions.Globalization
                    var attributes = node.GetAttributes();
                    attributes.AddPropertyIfNotExist("dir", "rtl");

-                    if (node is Table table)
+                    if (node is Table)
                    {
                        attributes.AddPropertyIfNotExist("align", "right");
                    }
@@ -71,19 +71,16 @@ namespace Markdig.Extensions.Globalization
            }
            else if (item is LiteralInline literal)
            {
-                return StartsWithRtlCharacter(literal.ToString());
+                return StartsWithRtlCharacter(literal.Content);
            }

-            foreach (var descendant in item.Descendants())
+            foreach (var paragraph in item.Descendants<ParagraphBlock>())
            {
-                if (descendant is ParagraphBlock p)
+                foreach (var inline in paragraph.Inline)
                {
-                    foreach (var i in p.Inline)
+                    if (inline is LiteralInline literal)
                    {
-                        if (i is LiteralInline l)
-                        {
-                            return StartsWithRtlCharacter(l.ToString());
-                        }
+                        return StartsWithRtlCharacter(literal.Content);
                    }
                }
            }
@@ -91,9 +88,9 @@ namespace Markdig.Extensions.Globalization
            return false;
        }

-        private bool StartsWithRtlCharacter(string text)
+        private bool StartsWithRtlCharacter(StringSlice slice)
        {
-            foreach (var c in CharHelper.ToUtf32(text))
+            foreach (var c in CharHelper.ToUtf32(slice))
            {
                if (CharHelper.IsRightToLeft(c))
                    return true;
--- a/src/Markdig/Extensions/MediaLinks/HostProviderBuilder.cs
+++ b/src/Markdig/Extensions/MediaLinks/HostProviderBuilder.cs
@@ -0,0 +1,137 @@
+// Copyright (c) Alexandre Mutel. All rights reserved.
+// This file is licensed under the BSD-Clause 2 license.
+// See the license.txt file in the project root for more information.
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace Markdig.Extensions.MediaLinks
+{
+    public class HostProviderBuilder
+    {
+        private sealed class DelegateProvider : IHostProvider
+        {
+            public string HostPrefix { get; set; }
+            public Func<Uri, string> Delegate { get; set; }
+            public bool AllowFullScreen { get; set; } = true;
+            public string Class { get; set; }
+
+            public bool TryHandle(Uri mediaUri, bool isSchemaRelative, out string iframeUrl)
+            {
+                if (!mediaUri.Host.StartsWith(HostPrefix, StringComparison.OrdinalIgnoreCase))
+                {
+                    iframeUrl = null;
+                    return false;
+                }
+                iframeUrl = Delegate(mediaUri);
+                return !string.IsNullOrEmpty(iframeUrl);
+            }
+        }
+
+        /// <summary>
+        /// Create a <see cref="IHostProvider"/> with delegate handler.
+        /// </summary>
+        /// <param name="hostPrefix">Prefix of host that can be handled.</param>
+        /// <param name="handler">Handler that generate iframe url, if uri cannot be handled, it can return <see langword="null"/>.</param>
+        /// <param name="allowFullScreen">Should the generated iframe has allowfullscreen attribute.</param>
+        /// <param name="iframeClass">"class" attribute of generated iframe.</param>
+        /// <returns>A <see cref="IHostProvider"/> with delegate handler.</returns>
+        public static IHostProvider Create(string hostPrefix, Func<Uri, string> handler, bool allowFullScreen = true, string iframeClass = null)
+        {
+            if (string.IsNullOrEmpty(hostPrefix))
+                throw new ArgumentException("hostPrefix is null or empty.", nameof(hostPrefix));
+            if (handler == null)
+                throw new ArgumentNullException(nameof(handler));
+            return new DelegateProvider { HostPrefix = hostPrefix, Delegate = handler, AllowFullScreen = allowFullScreen, Class = iframeClass };
+        }
+
+        internal static Dictionary<string, IHostProvider> KnownHosts { get; }
+            = new Dictionary<string, IHostProvider>(StringComparer.OrdinalIgnoreCase)
+            {
+                ["YouTube"] = Create("www.youtube.com", YouTube, iframeClass: "youtube"),
+                ["YouTubeShortened"] = Create("youtu.be", YouTubeShortened, iframeClass: "youtube"),
+                ["Vimeo"] = Create("vimeo.com", Vimeo, iframeClass: "vimeo"),
+                ["Yandex"] = Create("music.yandex.ru", Yandex, allowFullScreen: false, iframeClass: "yandex"),
+                ["Odnoklassniki"] = Create("ok.ru", Odnoklassniki, iframeClass: "odnoklassniki"),
+            };
+
+        #region Known providers
+
+        private static readonly string[] SplitAnd = { "&" };
+        private static string[] SplitQuery(Uri uri)
+        {
+            var query = uri.Query.Substring(uri.Query.IndexOf('?') + 1);
+            return query.Split(SplitAnd, StringSplitOptions.RemoveEmptyEntries);
+        }
+
+        private static string YouTube(Uri uri)
+        {
+            string uriPath = uri.AbsolutePath;
+            if (string.Equals(uriPath, "/embed", StringComparison.OrdinalIgnoreCase) || uriPath.StartsWith("/embed/", StringComparison.OrdinalIgnoreCase))
+            {
+                return uri.ToString();
+            }
+            if (!string.Equals(uriPath, "/watch", StringComparison.OrdinalIgnoreCase) && !uriPath.StartsWith("/watch/", StringComparison.OrdinalIgnoreCase))
+            {
+                return null;
+            }
+            var queryParams = SplitQuery(uri);
+            return BuildYouTubeIframeUrl(
+                queryParams.FirstOrDefault(p => p.StartsWith("v="))?.Substring(2),
+                queryParams.FirstOrDefault(p => p.StartsWith("t="))?.Substring(2)
+            );
+        }
+
+        private static string YouTubeShortened(Uri uri)
+        {
+            return BuildYouTubeIframeUrl(
+                uri.AbsolutePath.Substring(1),
+                SplitQuery(uri).FirstOrDefault(p => p.StartsWith("t="))?.Substring(2)
+            );
+        }
+
+        private static string BuildYouTubeIframeUrl(string videoId, string startTime)
+        {
+            if (string.IsNullOrEmpty(videoId))
+            {
+                return null;
+            }
+            string url = $"https://www.youtube.com/embed/{videoId}";
+            return string.IsNullOrEmpty(startTime) ? url : $"{url}?start={startTime}";
+        }
+
+        private static string Vimeo(Uri uri)
+        {
+            var items = uri.GetComponents(UriComponents.Path, UriFormat.Unescaped).Split('/');
+            return items.Length > 0 ? $"https://player.vimeo.com/video/{ items[items.Length - 1] }" : null;
+        }
+
+        private static string Odnoklassniki(Uri uri)
+        {
+            var items = uri.GetComponents(UriComponents.Path, UriFormat.Unescaped).Split('/');
+            return items.Length > 0 ? $"https://ok.ru/videoembed/{ items[items.Length - 1] }" : null;
+        }
+
+        private static string Yandex(Uri uri)
+        {
+            var items = uri.GetComponents(UriComponents.Path, UriFormat.Unescaped).Split('/');
+            var albumKeyword
+                = items.Skip(0).FirstOrDefault();
+            var albumId
+                = items.Skip(1).FirstOrDefault();
+            var trackKeyword
+                = items.Skip(2).FirstOrDefault();
+            var trackId
+                = items.Skip(3).FirstOrDefault();
+
+            if (albumKeyword != "album" || albumId == null || trackKeyword != "track" || trackId == null)
+            {
+                return null;
+            }
+
+            return $"https://music.yandex.ru/iframe/#track/{trackId}/{albumId}/";
+        }
+        #endregion
+    }
+}
--- a/src/Markdig/Extensions/MediaLinks/IHostProvider.cs
+++ b/src/Markdig/Extensions/MediaLinks/IHostProvider.cs
@@ -0,0 +1,36 @@
+// Copyright (c) Alexandre Mutel. All rights reserved.
+// This file is licensed under the BSD-Clause 2 license.
+// See the license.txt file in the project root for more information.
+
+using System;
+
+namespace Markdig.Extensions.MediaLinks
+{
+    /// <summary>
+    /// Provides url for media links.
+    /// </summary>
+    public interface IHostProvider
+    {
+        /// <summary>
+        /// "class" attribute of generated iframe.
+        /// </summary>
+        string Class { get; }
+
+        /// <summary>
+        /// Generate url for iframe.
+        /// </summary>
+        /// <param name="mediaUri">Input media uri.</param>
+        /// <param name="isSchemaRelative"><see langword="true"/> if <paramref name="mediaUri"/> is a schema relative uri, i.e. uri starts with "//".</param>
+        /// <param name="iframeUrl">Generated url for iframe.</param>
+        /// <seealso href="https://tools.ietf.org/html/rfc3986#section-4.2"/>
+        bool TryHandle(Uri mediaUri, bool isSchemaRelative, out string iframeUrl);
+
+        /// <summary>
+        /// Should the generated iframe has allowfullscreen attribute.
+        /// </summary>
+        /// <remarks>
+        /// Should be false for audio embedding.
+        /// </remarks>
+        bool AllowFullScreen { get; }
+    }
+}
--- a/src/Markdig/Extensions/MediaLinks/MediaLinkExtension.cs
+++ b/src/Markdig/Extensions/MediaLinks/MediaLinkExtension.cs
@@ -3,7 +3,6 @@
 // See the license.txt file in the project root for more information.

 using System;
-using System.Collections.Generic;
 using System.Linq;
 using Markdig.Renderers;
 using Markdig.Renderers.Html;
@@ -55,18 +54,28 @@ namespace Markdig.Extensions.MediaLinks
            }

            Uri uri;
+            bool isSchemaRelative = false;
            // Only process absolute Uri
            if (!Uri.TryCreate(linkInline.Url, UriKind.RelativeOrAbsolute, out uri) || !uri.IsAbsoluteUri)
            {
-                return false;
+                // see https://tools.ietf.org/html/rfc3986#section-4.2
+                // since relative uri doesn't support many properties, "http" is used as a placeholder here.
+                if (linkInline.Url.StartsWith("//") && Uri.TryCreate("http:" + linkInline.Url, UriKind.Absolute, out uri))
+                {
+                    isSchemaRelative = true;
+                }
+                else
+                {
+                    return false;
+                }
            }

-            if (TryRenderIframeFromKnownProviders(uri, renderer, linkInline))
+            if (TryRenderIframeFromKnownProviders(uri, isSchemaRelative, renderer, linkInline))
            {
                return true;
            }

-            if (TryGuessAudioVideoFile(uri, renderer, linkInline))
+            if (TryGuessAudioVideoFile(uri, isSchemaRelative, renderer, linkInline))
            {
                return true;
            }
@@ -86,7 +95,7 @@ namespace Markdig.Extensions.MediaLinks
            return htmlAttributes;
        }

-        private bool TryGuessAudioVideoFile(Uri uri, HtmlRenderer renderer, LinkInline linkInline)
+        private bool TryGuessAudioVideoFile(Uri uri, bool isSchemaRelative, HtmlRenderer renderer, LinkInline linkInline)
        {
            var path = uri.GetComponents(UriComponents.Path, UriFormat.Unescaped);
            // Otherwise try to detect if we have an audio/video from the file extension
@@ -106,6 +115,10 @@ namespace Markdig.Extensions.MediaLinks
                    htmlAttributes.AddPropertyIfNotExist("height", Options.Height);
                }
                htmlAttributes.AddPropertyIfNotExist("controls", null);
+
+                if (!string.IsNullOrEmpty(Options.Class))
+                    htmlAttributes.AddPropertyIfNotExist("class", Options.Class);
+
                renderer.WriteAttributes(htmlAttributes);

                renderer.Write($"><source type=\"{mimeType}\" src=\"{linkInline.Url}\"></source></{tagType}>");
@@ -115,38 +128,18 @@ namespace Markdig.Extensions.MediaLinks
            return false;
        }

-        #region Known providers
-
-        private class KnownProvider
+        private bool TryRenderIframeFromKnownProviders(Uri uri, bool isSchemaRelative, HtmlRenderer renderer, LinkInline linkInline)
        {
-            public string HostPrefix { get; set; }
-            public Func<Uri, string> Delegate { get; set; }
-            public bool AllowFullScreen { get; set; } = true; //Should be false for audio embedding
-        }

-        private static readonly List<KnownProvider> KnownHosts = new List<KnownProvider>()
-        {
-            new KnownProvider {HostPrefix = "www.youtube.com", Delegate = YouTube},
-            new KnownProvider {HostPrefix = "youtu.be", Delegate = YouTubeShortened},
-            new KnownProvider {HostPrefix = "vimeo.com", Delegate = Vimeo},
-            new KnownProvider {HostPrefix = "music.yandex.ru", Delegate = Yandex, AllowFullScreen = false},
-            new KnownProvider {HostPrefix = "ok.ru", Delegate = Odnoklassniki},
-        };
-
-
-        private bool TryRenderIframeFromKnownProviders(Uri uri, HtmlRenderer renderer, LinkInline linkInline)
-        {
-            var foundProvider =
-                KnownHosts
-                    .Where(pair => uri.Host.StartsWith(pair.HostPrefix, StringComparison.OrdinalIgnoreCase))  // when host is match
-                    .Select(provider =>
-                        new
-                        {
-                            provider.AllowFullScreen,
-                            Result = provider.Delegate(uri) // try to call delegate to get iframeUrl
-                        }
-                        )
-                    .FirstOrDefault(provider => provider.Result != null);                                   // use first success
+            IHostProvider foundProvider = null;
+            string iframeUrl = null;
+            foreach (var provider in Options.Hosts)
+            {
+                if (!provider.TryHandle(uri, isSchemaRelative, out iframeUrl))
+                    continue;
+                foundProvider = provider;
+                break;
+            }

            if (foundProvider == null)
            {
@@ -155,17 +148,20 @@ namespace Markdig.Extensions.MediaLinks

            var htmlAttributes = GetHtmlAttributes(linkInline);
            renderer.Write("<iframe src=\"");
-            renderer.WriteEscapeUrl(foundProvider.Result);
+            renderer.WriteEscapeUrl(iframeUrl);
            renderer.Write("\"");

-            if(!string.IsNullOrEmpty(Options.Width))
+            if (!string.IsNullOrEmpty(Options.Width))
                htmlAttributes.AddPropertyIfNotExist("width", Options.Width);

            if (!string.IsNullOrEmpty(Options.Height))
                htmlAttributes.AddPropertyIfNotExist("height", Options.Height);

-            if (!string.IsNullOrEmpty(Options.Class))
-                htmlAttributes.AddPropertyIfNotExist("class", Options.Class);
+            if (!string.IsNullOrEmpty(Options.Class) || !string.IsNullOrEmpty(foundProvider.Class))
+                htmlAttributes.AddPropertyIfNotExist("class",
+                    (!string.IsNullOrEmpty(Options.Class) && !string.IsNullOrEmpty(foundProvider.Class))
+                    ? Options.Class + " " + foundProvider.Class
+                    : Options.Class + foundProvider.Class);

            htmlAttributes.AddPropertyIfNotExist("frameborder", "0");
            if (foundProvider.AllowFullScreen)
@@ -177,81 +173,5 @@ namespace Markdig.Extensions.MediaLinks

            return true;
        }
-
-        private static readonly string[] SplitAnd = {"&"};
-        private static string[] SplitQuery(Uri uri)
-        {
-            var query = uri.Query.Substring(uri.Query.IndexOf('?') + 1);
-            return query.Split(SplitAnd, StringSplitOptions.RemoveEmptyEntries);
-        }
-
-        private static string YouTube(Uri uri)
-        {
-            string uriPath = uri.AbsolutePath;
-            if (string.Equals(uriPath, "/embed", StringComparison.OrdinalIgnoreCase) || uriPath.StartsWith("/embed/", StringComparison.OrdinalIgnoreCase))
-            {
-                return uri.ToString();
-            }
-            if (!string.Equals(uriPath, "/watch", StringComparison.OrdinalIgnoreCase) && !uriPath.StartsWith("/watch/", StringComparison.OrdinalIgnoreCase))
-            {
-                return null;
-            }
-            var queryParams = SplitQuery(uri);
-            return BuildYouTubeIframeUrl(
-                queryParams.FirstOrDefault(p => p.StartsWith("v="))?.Substring(2),
-                queryParams.FirstOrDefault(p => p.StartsWith("t="))?.Substring(2)
-            );
-        }
-
-        private static string YouTubeShortened(Uri uri)
-        {
-            return BuildYouTubeIframeUrl(
-                uri.AbsolutePath.Substring(1),
-                SplitQuery(uri).FirstOrDefault(p => p.StartsWith("t="))?.Substring(2)
-            );
-        }
-
-        private static string BuildYouTubeIframeUrl(string videoId, string startTime)
-        {
-            if (string.IsNullOrEmpty(videoId))
-            {
-                return null;
-            }
-            string url = $"https://www.youtube.com/embed/{videoId}";
-            return string.IsNullOrEmpty(startTime) ? url : $"{url}?start={startTime}";
-        }
-
-        private static string Vimeo(Uri uri)
-        {
-            var items = uri.GetComponents(UriComponents.Path, UriFormat.Unescaped).Split('/');
-            return items.Length > 0 ? $"https://player.vimeo.com/video/{items[items.Length - 1]}" : null;
-        }
-
-        private static string Odnoklassniki(Uri uri)
-        {
-            var items = uri.GetComponents(UriComponents.Path, UriFormat.Unescaped).Split('/');
-            return items.Length > 0 ? $"https://ok.ru/videoembed/{items[items.Length - 1]}" : null;
-        }
-
-        private static string Yandex(Uri uri)
-        {
-            var items = uri.GetComponents(UriComponents.Path, UriFormat.Unescaped).Split('/');
-            var albumKeyword
-                = items.Skip(0).FirstOrDefault();
-            var albumId
-                = items.Skip(1).FirstOrDefault();
-            var trackKeyword
-                = items.Skip(2).FirstOrDefault();
-            var trackId
-                = items.Skip(3).FirstOrDefault();
-
-            if (albumKeyword != "album" || albumId == null || trackKeyword != "track" || trackId == null)
-            {
-                return null;
-            }
-
-            return $"https://music.yandex.ru/iframe/#track/{trackId}/{albumId}/";
-        }
-        #endregion
    }
 }
--- a/src/Markdig/Extensions/MediaLinks/MediaOptions.cs
+++ b/src/Markdig/Extensions/MediaLinks/MediaOptions.cs
@@ -76,12 +76,14 @@ namespace Markdig.Extensions.MediaLinks
                {".ecelp7470", "audio/vnd.nuera.ecelp7470"},
                {".ecelp9600", "audio/vnd.nuera.ecelp9600"},
                {".oga", "audio/ogg"},
+                {".ogg", "audio/ogg"},
                {".weba", "audio/webm"},
                {".ram", "audio/x-pn-realaudio"},
                {".rmp", "audio/x-pn-realaudio-plugin"},
                {".au", "audio/basic"},
                {".wav", "audio/x-wav"},
            };
+            Hosts = new List<IHostProvider>(HostProviderBuilder.KnownHosts.Values);
        }

        public string Width { get; set; }
@@ -91,5 +93,7 @@ namespace Markdig.Extensions.MediaLinks
        public string Class { get; set; }

        public Dictionary<string, string> ExtensionToMimeType { get; }
+
+        public List<IHostProvider> Hosts { get; }
    }
 }
--- a/src/Markdig/Extensions/Tables/HtmlTableRenderer.cs
+++ b/src/Markdig/Extensions/Tables/HtmlTableRenderer.cs
@@ -41,7 +41,7 @@ namespace Markdig.Extensions.Tables
                {
                    var width = Math.Round(tableColumnDefinition.Width*100)/100;
                    var widthValue = string.Format(CultureInfo.InvariantCulture, "{0:0.##}", width);
-                    renderer.WriteLine($"<col style=\"width:{widthValue}%\">");
+                    renderer.WriteLine($"<col style=\"width:{widthValue}%\" />");
                }
            }

@@ -135,4 +135,4 @@ namespace Markdig.Extensions.Tables
            renderer.WriteLine("</table>");
        }
    }
-}
+}
--- a/src/Markdig/Extensions/Tables/Table.cs
+++ b/src/Markdig/Extensions/Tables/Table.cs
@@ -58,6 +58,11 @@ namespace Markdig.Extensions.Tables
                    var rowSpan = cell.RowSpan - 1;
                    while (rowSpan > 0)
                    {
+                        if (i+rowSpan > (rows.Length-1))
+                        {
+                            return false;
+                        }
+
                        rows[i + rowSpan] += cell.ColumnSpan;
                        rowSpan--;
                    }
--- a/src/Markdig/Helpers/CharHelper.cs
+++ b/src/Markdig/Helpers/CharHelper.cs
@@ -177,7 +177,7 @@ namespace Markdig.Helpers
        {
            // 2.1 Characters and lines 
            // A whitespace character is a space(U + 0020), tab(U + 0009), newline(U + 000A), line tabulation (U + 000B), form feed (U + 000C), or carriage return (U + 000D).
-            return c == ' ' || c == '\t' || c == '\n' || c == '\v' || c == '\f' || c == '\r';
+            return c <= ' ' && (c == ' ' || c == '\t' || c == '\n' || c == '\v' || c == '\f' || c == '\r');
        }

        [MethodImpl(MethodImplOptionPortable.AggressiveInlining)]
@@ -303,8 +303,8 @@ namespace Markdig.Helpers

        [MethodImpl(MethodImplOptionPortable.AggressiveInlining)]
        public static bool IsAlpha(this char c)
-        {
-            return ((uint)(c - 'a') <= ('z' - 'a')) || ((uint)(c - 'A') <= ('Z' - 'A'));
+        {
+            return (uint)((c - 'A') & ~0x20) <= ('Z' - 'A');
        }

        [MethodImpl(MethodImplOptionPortable.AggressiveInlining)]
@@ -370,16 +370,20 @@ namespace Markdig.Helpers

        [MethodImpl(MethodImplOptionPortable.AggressiveInlining)]
        public static bool IsHighSurrogate(char c)
-        {
-            return ((c >= HighSurrogateStart) && (c <= HighSurrogateEnd));
+        {
+            return IsInInclusiveRange(c, HighSurrogateStart, HighSurrogateEnd);
        }

        [MethodImpl(MethodImplOptionPortable.AggressiveInlining)]
        public static bool IsLowSurrogate(char c)
        {
-            return ((c >= LowSurrogateStart) && (c <= LowSurrogateEnd));
+            return IsInInclusiveRange(c, LowSurrogateStart, LowSurrogateEnd);
        }

+        [MethodImpl(MethodImplOptionPortable.AggressiveInlining)]
+        private static bool IsInInclusiveRange(char c, char min, char max)
+            => (uint) (c - min) <= (uint) (max - min);
+
        public static int ConvertToUtf32(char highSurrogate, char lowSurrogate)
        {
            if (!IsHighSurrogate(highSurrogate))
@@ -393,13 +397,14 @@ namespace Markdig.Helpers
            return (((highSurrogate - HighSurrogateStart) * 0x400) + (lowSurrogate - LowSurrogateStart) + UnicodePlane01Start);
        }

-        public static IEnumerable<int> ToUtf32(string text)
+        public static IEnumerable<int> ToUtf32(StringSlice text)
        {
-            for (int i = 0; i < text.Length; i++)
+            for (int i = text.Start; i <= text.End; i++)
            {
-                if (IsHighSurrogate(text[i]) && i < text.Length - 1 && IsLowSurrogate(text[i + 1]))
-                {
-                    yield return ConvertToUtf32(text[i], text[i + 1]);
+                if (IsHighSurrogate(text[i]) && i < text.End && IsLowSurrogate(text[i + 1]))
+                {
+                    Debug.Assert(char.IsSurrogatePair(text[i], text[i + 1]));
+                    yield return char.ConvertToUtf32(text[i], text[i + 1]);
                }
                else
                {
--- a/src/Markdig/Helpers/CharacterMap.cs
+++ b/src/Markdig/Helpers/CharacterMap.cs
@@ -4,6 +4,7 @@

 using System;
 using System.Collections.Generic;
+using System.Diagnostics;
 using System.Linq;
 using System.Runtime.CompilerServices;

@@ -17,7 +18,7 @@ namespace Markdig.Helpers
    {
        private readonly T[] asciiMap;
        private readonly Dictionary<char, T> nonAsciiMap;
-        private readonly bool[] isOpeningCharacter;
+        private readonly BitVector128 isOpeningCharacter;

        /// <summary>
        /// Initializes a new instance of the <see cref="CharacterMap{T}"/> class.
@@ -27,40 +28,36 @@ namespace Markdig.Helpers
        public CharacterMap(IEnumerable<KeyValuePair<char, T>> maps)
        {
            if (maps == null) throw new ArgumentNullException(nameof(maps));
-            var charCounter = new Dictionary<char, int>();
+            var charSet = new HashSet<char>();
            int maxChar = 0;

            foreach (var map in maps)
            {
                var openingChar = map.Key;

-                if (!charCounter.ContainsKey(openingChar))
-                {
-                    charCounter[openingChar] = 0;
-                }
-                charCounter[openingChar]++;
+                charSet.Add(openingChar);

-                if (openingChar < 127 && openingChar > maxChar)
+                if (openingChar < 128 && openingChar > maxChar)
                {
                    maxChar = openingChar;
                }
-                else if (openingChar >= 127 && nonAsciiMap == null)
+                else if (openingChar >= 128 && nonAsciiMap == null)
                {
                    // Initialize only if with have an actual non-ASCII opening character
                    nonAsciiMap = new Dictionary<char, T>();
                }
            }
-            OpeningCharacters = charCounter.Keys.ToArray();
+            OpeningCharacters = charSet.ToArray();
            Array.Sort(OpeningCharacters);

            asciiMap = new T[maxChar + 1];
-            isOpeningCharacter = new bool[maxChar + 1];
+            var isOpeningCharacter = new BitVector128();

            foreach (var state in maps)
            {
                var openingChar = state.Key;
                T stateByChar;
-                if (openingChar < 127)
+                if (openingChar < 128)
                {
                    stateByChar = asciiMap[openingChar];

@@ -68,7 +65,7 @@ namespace Markdig.Helpers
                    {
                        asciiMap[openingChar] = state.Value;
                    }
-                    isOpeningCharacter[openingChar] = true;
+                    isOpeningCharacter.Set(openingChar);
                }
                else
                {
@@ -78,6 +75,8 @@ namespace Markdig.Helpers
                    }
                }
            }
+
+            this.isOpeningCharacter = isOpeningCharacter;
        }

        /// <summary>
@@ -117,19 +116,18 @@ namespace Markdig.Helpers
        /// <returns>Index position within the string of the first opening character found in the specified text; if not found, returns -1</returns>
        public int IndexOfOpeningCharacter(string text, int start, int end)
        {
-            var maxChar = isOpeningCharacter.Length;
+            var openingChars = isOpeningCharacter;

            unsafe
            {
                fixed (char* pText = text)
-                fixed (bool* openingChars = isOpeningCharacter)
                {
                    if (nonAsciiMap == null)
                    {
                        for (int i = start; i <= end; i++)
                        {
                            var c = pText[i];
-                            if (c < maxChar && openingChars[c])
+                            if (c < 128 && openingChars[c])
                            {
                                return i;
                            }
@@ -140,7 +138,7 @@ namespace Markdig.Helpers
                        for (int i = start; i <= end; i++)
                        {
                            var c = pText[i];
-                            if ((c < maxChar && openingChars[c]) || nonAsciiMap.ContainsKey(c))
+                            if (c < 128 ? openingChars[c] : nonAsciiMap.ContainsKey(c))
                            {
                                return i;
                            }
@@ -150,5 +148,26 @@ namespace Markdig.Helpers
            }
            return -1;
        }
+
+        internal unsafe struct BitVector128
+        {
+            fixed uint values[4];
+
+            public void Set(char c)
+            {
+                Debug.Assert(c < 128);
+                values[c >> 5] |= (uint)1 << c;
+            }
+
+            public readonly bool this[char c]
+            {
+                [MethodImpl(MethodImplOptionPortable.AggressiveInlining)]
+                get
+                {
+                    Debug.Assert(c < 128);
+                    return (values[c >> 5] & (uint)1 << c) != 0;
+                }
+            }
+        }
    }
 }
--- a/src/Markdig/Helpers/CompactPrefixTree.cs
+++ b/src/Markdig/Helpers/CompactPrefixTree.cs
@@ -4,6 +4,7 @@ using System;
 using System.Collections;
 using System.Collections.Generic;
 using System.Diagnostics;
+using System.Diagnostics.CodeAnalysis;
 using System.Runtime.CompilerServices;

 /*
@@ -25,6 +26,7 @@ namespace Markdig.Helpers
    /// <para>Something between a Trie and a full Radix tree, but stored linearly in memory</para>
    /// </summary>
    /// <typeparam name="TValue">The value associated with the key</typeparam>
+    [ExcludeFromCodeCoverage]
    internal sealed class CompactPrefixTree<TValue>
 //#if !LEGACY
 //        : IReadOnlyDictionary<string, TValue>, IReadOnlyList<KeyValuePair<string, TValue>>
--- a/src/Markdig/Helpers/ExcludeFromCodeCoverageAttribute.cs
+++ b/src/Markdig/Helpers/ExcludeFromCodeCoverageAttribute.cs
@@ -0,0 +1,10 @@
+#if NET35
+namespace System.Diagnostics.CodeAnalysis
+{
+    [AttributeUsage(AttributeTargets.All, AllowMultiple = false, Inherited = false)]
+    internal class ExcludeFromCodeCoverageAttribute : Attribute
+    {
+
+    }
+}
+#endif
--- a/src/Markdig/Helpers/LineReader.cs
+++ b/src/Markdig/Helpers/LineReader.cs
@@ -1,10 +1,9 @@
-// Copyright (c) Alexandre Mutel. All rights reserved.
+// Copyright (c) Alexandre Mutel. All rights reserved.
 // This file is licensed under the BSD-Clause 2 license. 
 // See the license.txt file in the project root for more information.

 using System;
 using System.IO;
-using System.Text;

 namespace Markdig.Helpers
 {
@@ -13,17 +12,16 @@ namespace Markdig.Helpers
    /// </summary>
    public struct LineReader
    {
-        private readonly string text;
+        private readonly string _text;

        /// <summary>
        /// Initializes a new instance of the <see cref="LineReader"/> class.
        /// </summary>
-        /// <exception cref="System.ArgumentNullException"></exception>
-        /// <exception cref="System.ArgumentOutOfRangeException">bufferSize cannot be &lt;= 0</exception>
+        /// <exception cref="ArgumentNullException"></exception>
+        /// <exception cref="ArgumentOutOfRangeException">bufferSize cannot be &lt;= 0</exception>
        public LineReader(string text)
        {
-            if (text == null) throw new ArgumentNullException(nameof(text));
-            this.text = text;
+            _text = text ?? throw new ArgumentNullException(nameof(text));
            SourcePosition = 0;
        }

@@ -36,36 +34,31 @@ namespace Markdig.Helpers
        /// Reads a new line from the underlying <see cref="TextReader"/> and update the <see cref="SourcePosition"/> for the next line.
        /// </summary>
        /// <returns>A new line or null if the end of <see cref="TextReader"/> has been reached</returns>
-        public StringSlice? ReadLine()
+        public StringSlice ReadLine()
        {
-            if (SourcePosition >= text.Length)
-            {
-                return null;
-            }
+            string text = _text;
+            int sourcePosition = SourcePosition;

-            var startPosition = SourcePosition;
-            var position = SourcePosition;
-            var slice = new StringSlice(text, startPosition, startPosition);
-            for (;position < text.Length; position++)
+            for (int i = sourcePosition; i < text.Length; i++)
            {
-                var c = text[position];
+                char c = text[i];
                if (c == '\r' || c == '\n')
                {
-                    slice.End = position - 1;
-                    if (c == '\r' && position + 1 < text.Length && text[position + 1] == '\n')
-                    {
-                        position++;
-                    }
-                    position++;
-                    SourcePosition = position;
+                    var slice = new StringSlice(text, sourcePosition, i - 1);
+
+                    if (c == '\r' && (uint)(i + 1) < (uint)text.Length && text[i + 1] == '\n')
+                        i++;
+
+                    SourcePosition = i + 1;
                    return slice;
                }
            }

-            slice.End = position - 1;
-            SourcePosition = position;
+            if (sourcePosition >= text.Length)
+                return default;

-            return slice;
+            SourcePosition = int.MaxValue;
+            return new StringSlice(text, sourcePosition, text.Length - 1);
        }
-   }
+    }
 }
--- a/src/Markdig/Helpers/LinkHelper.cs
+++ b/src/Markdig/Helpers/LinkHelper.cs
@@ -101,15 +101,13 @@ namespace Markdig.Helpers
            var headingBuffer = StringBuilderCache.Local();
            for (int i = 0; i < headingText.Length; i++)
            {
-                var c = char.ToLowerInvariant(headingText[i]);
+                var c = headingText[i];
                if (char.IsLetterOrDigit(c) || c == ' ' || c == '-' || c == '_')
                {
-                    headingBuffer.Append(c == ' ' ? '-' : c);
+                    headingBuffer.Append(c == ' ' ? '-' : char.ToLowerInvariant(c));
                }
            }
-            var result = headingBuffer.ToString();
-            headingBuffer.Length = 0;
-            return result;
+            return headingBuffer.GetStringAndReset();
        }

        [MethodImpl(MethodImplOptionPortable.AggressiveInlining)]
--- a/src/Markdig/Helpers/StringLineGroup.cs
+++ b/src/Markdig/Helpers/StringLineGroup.cs
@@ -5,6 +5,7 @@
 using System;
 using System.Collections;
 using System.Collections.Generic;
+using System.Diagnostics;
 using System.Runtime.CompilerServices;

 namespace Markdig.Helpers
@@ -68,16 +69,13 @@ namespace Markdig.Helpers
        /// <param name="index">The index.</param>
        public void RemoveAt(int index)
        {
-            if (Count - 1 == index)
-            {
-                Count--;
-            }
-            else
+            if (index != Count - 1)
            {
                Array.Copy(Lines, index + 1, Lines, index, Count - index - 1);
-                Lines[Count - 1] = new StringLine();
-                Count--;
            }
+
+            Lines[Count - 1] = new StringLine();
+            Count--;
        }

        /// <summary>
@@ -114,22 +112,19 @@ namespace Markdig.Helpers
        /// <returns>A single slice concatenating the lines of this instance</returns>
        public readonly StringSlice ToSlice(List<LineOffset> lineOffsets = null)
        {
+            // Optimization case for a single line.
+            if (Count == 1)
+            {
+                lineOffsets?.Add(new LineOffset(Lines[0].Position, Lines[0].Column, Lines[0].Slice.Start - Lines[0].Position, Lines[0].Slice.Start, Lines[0].Slice.End + 1));
+                return Lines[0];
+            }
+
            // Optimization case when no lines
            if (Count == 0)
            {
                return new StringSlice(string.Empty);
            }

-            // Optimization case for a single line.
-            if (Count == 1)
-            {
-                if (lineOffsets != null)
-                {
-                    lineOffsets.Add(new LineOffset(Lines[0].Position, Lines[0].Column, Lines[0].Slice.Start - Lines[0].Position, Lines[0].Slice.Start, Lines[0].Slice.End + 1));
-                }
-                return Lines[0];
-            }
-
            if (lineOffsets != null && lineOffsets.Capacity < lineOffsets.Count + Count)
            {
                lineOffsets.Capacity = Math.Max(lineOffsets.Count + Count, lineOffsets.Capacity * 2);
@@ -142,21 +137,16 @@ namespace Markdig.Helpers
            {
                if (i > 0)
                {
-                    if (lineOffsets != null)
-                    {
-                        lineOffsets.Add(new LineOffset(Lines[i - 1].Position, Lines[i - 1].Column, Lines[i - 1].Slice.Start - Lines[i - 1].Position, previousStartOfLine, builder.Length));
-                    }
                    builder.Append('\n');
                    previousStartOfLine = builder.Length;
                }
-                if (!Lines[i].Slice.IsEmpty)
+                ref var line = ref Lines[i];
+                if (!line.Slice.IsEmpty)
                {
-                    builder.Append(Lines[i].Slice.Text, Lines[i].Slice.Start, Lines[i].Slice.Length);
+                    builder.Append(line.Slice.Text, line.Slice.Start, line.Slice.Length);
                }
-            }
-            if (lineOffsets != null)
-            {
-                lineOffsets.Add(new LineOffset(Lines[Count - 1].Position, Lines[Count - 1].Column, Lines[Count - 1].Slice.Start - Lines[Count - 1].Position, previousStartOfLine, builder.Length));
+
+                lineOffsets?.Add(new LineOffset(line.Position, line.Column, line.Slice.Start - line.Position, previousStartOfLine, builder.Length));
            }
            return new StringSlice(builder.GetStringAndReset());
        }
@@ -267,10 +257,10 @@ namespace Markdig.Helpers
            public char NextChar()
            {
                Start++;
-                _offset++;
                if (Start <= End)
                {
-                    var slice = (StringSlice)_lines.Lines[SliceIndex];
+                    var slice = _lines.Lines[SliceIndex].Slice;
+                    _offset++;
                    if (_offset < slice.Length)
                    {
                        CurrentChar = slice[slice.Start + _offset];
@@ -287,7 +277,6 @@ namespace Markdig.Helpers
                    CurrentChar = '\0';
                    Start = End + 1;
                    SliceIndex = _lines.Count;
-                    _offset--;
                }
                return CurrentChar;
            }
@@ -301,13 +290,27 @@ namespace Markdig.Helpers
                    return '\0';
                }

-                var slice = (StringSlice)_lines.Lines[SliceIndex];
-                if (_offset + offset >= slice.Length)
+                offset += _offset;
+
+                int sliceIndex = SliceIndex;
+                var slice = _lines.Lines[sliceIndex].Slice;
+
+                while (offset > slice.Length)
+                {
+                    // We are not peeking at the same line
+                    offset -= slice.Length + 1; // + 1 for new line
+
+                    Debug.Assert(sliceIndex + 1 < _lines.Lines.Length, "'Start + offset > End' check above should prevent us from indexing out of range");
+                    slice = _lines.Lines[++sliceIndex].Slice;
+                }
+
+                if (offset == slice.Length)
                {
                    return '\n';
                }

-                return slice[slice.Start + _offset + offset];
+                Debug.Assert(offset < slice.Length);
+                return slice[slice.Start + offset];
            }

            public bool TrimStart()
--- a/src/Markdig/Helpers/StringSlice.cs
+++ b/src/Markdig/Helpers/StringSlice.cs
@@ -315,7 +315,8 @@ namespace Markdig.Helpers
            // Strip leading spaces
            for (; Start <= End; Start++)
            {
-                if (!Text[Start].IsWhitespace())
+                if (Start < Text.Length
+                    && !Text[Start].IsWhitespace())
                {
                    break;
                }
@@ -349,7 +350,8 @@ namespace Markdig.Helpers
        {
            for (; Start <= End; End--)
            {
-                if (!Text[End].IsWhitespace())
+                if (End < Text.Length
+                   && !Text[End].IsWhitespace())
                {
                    break;
                }
--- a/src/Markdig/Helpers/ThrowHelper.cs
+++ b/src/Markdig/Helpers/ThrowHelper.cs
@@ -1,11 +1,13 @@
 using System;
 using System.Diagnostics;
+using System.Diagnostics.CodeAnalysis;

 namespace Markdig.Helpers
 {
    /// <summary>
    /// Inspired by CoreLib, taken from https://github.com/MihaZupan/SharpCollections, cc @MihaZupan
    /// </summary>
+    [ExcludeFromCodeCoverage]
    internal static class ThrowHelper
    {
        public static void ThrowArgumentNullException(ExceptionArgument argument)
--- a/src/Markdig/Markdig.targets
+++ b/src/Markdig/Markdig.targets
@@ -4,9 +4,9 @@
    <Description>A fast, powerful, CommonMark compliant, extensible Markdown processor for .NET with 20+ builtin extensions (pipetables, footnotes, definition lists... etc.)</Description>
    <Copyright>Alexandre Mutel</Copyright>
    <NeutralLanguage>en-US</NeutralLanguage>
-    <VersionPrefix>0.18.0</VersionPrefix>
+    <VersionPrefix>0.18.2</VersionPrefix>
    <Authors>Alexandre Mutel</Authors>
-    <TargetFrameworks>net35;net40;netstandard2.0;uap10.0;netcoreapp2.1</TargetFrameworks>
+    <TargetFrameworks>net35;net40;netstandard2.0;netcoreapp2.1</TargetFrameworks>
    <PackageTags>Markdown CommonMark md html md2html</PackageTags>
    <PackageReleaseNotes>https://github.com/lunet-io/markdig/blob/master/changelog.md</PackageReleaseNotes>
    <PackageLicenseExpression>BSD-2-Clause</PackageLicenseExpression>
@@ -20,24 +20,13 @@
    <DefineConstants>$(DefineConstants);NETCORE</DefineConstants>
  </PropertyGroup>

-  <PropertyGroup Condition=" '$(TargetFramework)' == 'uap10.0' ">
-    <TargetPlatformIdentifier>UAP</TargetPlatformIdentifier>
-    <TargetPlatformVersion Condition="'$(TargetPlatformVersion)' == ''">10.0.17763.0</TargetPlatformVersion>
-    <TargetPlatformMinVersion Condition="'$(TargetPlatformMinVersion)' == ''">10.0.10240.0</TargetPlatformMinVersion>
-    <DefineConstants>$(DefineConstants);UAP</DefineConstants>
-  </PropertyGroup>
+  <ItemGroup Condition=" '$(TargetFramework)' == 'net35' OR '$(TargetFramework)' == 'net40'">
+    <PackageReference Include="Microsoft.NETFramework.ReferenceAssemblies" Version="1.0.0" />
+    <PackageReference Include="jnm2.ReferenceAssemblies.net35" Version="1.0.1" />
+  </ItemGroup>

  <PropertyGroup Condition=" '$(Configuration)' == 'Release' ">
    <NoWarn>$(NoWarn);CS1591</NoWarn>
    <GenerateDocumentationFile>true</GenerateDocumentationFile>
  </PropertyGroup>
-
-  <!-- Special packages and imports for UWP support -->
-  <ItemGroup>
-    <PackageReference Include="MSBuild.Sdk.Extras" Version="1.0.9" PrivateAssets="all" />
-  </ItemGroup>
-  <ItemGroup Condition=" '$(TargetFramework)' == 'uap10.0' ">
-    <PackageReference Include="Microsoft.NETCore.UniversalWindowsPlatform " Version="5.2.2" />
-  </ItemGroup>
-  <Import Project="$(MSBuildSDKExtrasTargets)" Condition="Exists('$(MSBuildSDKExtrasTargets)')" />
 </Project>
--- a/src/Markdig/Markdown.cs
+++ b/src/Markdig/Markdown.cs
@@ -17,11 +17,7 @@ namespace Markdig
    /// </summary>
    public static partial class Markdown
    {
-#if UAP
-        public static readonly string Version = typeof(Markdown).GetTypeInfo().Assembly.GetCustomAttribute<AssemblyFileVersionAttribute>().Version;
-#else
        public static readonly string Version = ((AssemblyFileVersionAttribute) typeof(Markdown).Assembly.GetCustomAttributes(typeof(AssemblyFileVersionAttribute), false)[0]).Version;
-#endif

        /// <summary>
        /// Normalizes the specified markdown to a normalized markdown text.
--- a/src/Markdig/MarkdownExtensions.cs
+++ b/src/Markdig/MarkdownExtensions.cs
@@ -92,8 +92,8 @@ namespace Markdig
                .UseDiagrams()
                .UseAutoLinks()
                .UseGenericAttributes(); // Must be last as it is one parser that is modifying other parsers
-        }
-        
+        }
+
        /// <summary>
        /// Uses this extension to enable autolinks from text `http://`, `https://`, `ftp://`, `mailto:`, `www.xxx.yyy`
        /// </summary>
@@ -421,20 +421,35 @@ namespace Markdig
        }

        /// <summary>
-        /// Uses the emoji and smiley extension.
+        /// Uses the emojis and smileys extension.
        /// </summary>
        /// <param name="pipeline">The pipeline.</param>
-        /// <param name="enableSmiley">Enable smiley in addition to Emoji, <c>true</c> by default.</param>
+        /// <param name="enableSmileys">Enable smileys in addition to emoji shortcodes, <c>true</c> by default.</param>
        /// <returns>The modified pipeline</returns>
-        public static MarkdownPipelineBuilder UseEmojiAndSmiley(this MarkdownPipelineBuilder pipeline, bool enableSmiley = true)
+        public static MarkdownPipelineBuilder UseEmojiAndSmiley(this MarkdownPipelineBuilder pipeline, bool enableSmileys = true)
        {
            if (!pipeline.Extensions.Contains<EmojiExtension>())
            {
-                pipeline.Extensions.Add(new EmojiExtension(enableSmiley));
+                var emojiMapping = enableSmileys ? EmojiMapping.DefaultEmojisAndSmileysMapping : EmojiMapping.DefaultEmojisOnlyMapping;
+                pipeline.Extensions.Add(new EmojiExtension(emojiMapping));
            }
            return pipeline;
        }

+        /// <summary>
+        /// Uses the emojis and smileys extension.
+        /// </summary>
+        /// <param name="pipeline">The pipeline.</param>
+        /// <param name="customEmojiMapping">Enable customization of the emojis and smileys mapping.</param>
+        /// <returns>The modified pipeline</returns>
+        public static MarkdownPipelineBuilder UseEmojiAndSmiley(this MarkdownPipelineBuilder pipeline, EmojiMapping customEmojiMapping)
+        {
+            if (!pipeline.Extensions.Contains<EmojiExtension>())
+            {
+                pipeline.Extensions.Add(new EmojiExtension(customEmojiMapping));
+            }
+            return pipeline;
+        }
        /// <summary>
        /// Add rel=nofollow to all links rendered to HTML.
        /// </summary>
--- a/src/Markdig/Parsers/MarkdownParser.cs
+++ b/src/Markdig/Parsers/MarkdownParser.cs
@@ -116,11 +116,11 @@ namespace Markdig.Parsers
                var lineText = lineReader.ReadLine();
                
                // If this is the end of file and the last line is empty
-                if (lineText == null)
+                if (lineText.Text is null)
                {
                    break;
                }
-                blockProcessor.ProcessLine(lineText.Value);
+                blockProcessor.ProcessLine(lineText);
            }
            blockProcessor.CloseAll(true);
        }
--- a/src/Markdig/Renderers/Html/HeadingRenderer.cs
+++ b/src/Markdig/Renderers/Html/HeadingRenderer.cs
@@ -23,9 +23,10 @@ namespace Markdig.Renderers.Html

        protected override void Write(HtmlRenderer renderer, HeadingBlock obj)
        {
-            var headingText = obj.Level > 0 && obj.Level <= 6
-                ? HeadingTexts[obj.Level - 1]
-                : "<h" + obj.Level.ToString(CultureInfo.InvariantCulture);
+            int index = obj.Level - 1;
+            string headingText = ((uint)index < (uint)HeadingTexts.Length)
+                ? HeadingTexts[index]
+                : "h" + obj.Level.ToString(CultureInfo.InvariantCulture);

            if (renderer.EnableHtmlForBlock)
            {
--- a/src/Markdig/Syntax/ContainerBlock.cs
+++ b/src/Markdig/Syntax/ContainerBlock.cs
@@ -158,6 +158,10 @@ namespace Markdig.Syntax
            {
                throw new ArgumentException("Cannot add this block as it as already attached to another container (block.Parent != null)");
            }
+            if (index < 0 || index > Count)
+            {
+                throw new ArgumentOutOfRangeException(nameof(index));
+            }
            if (Count == children.Length)
            {
                EnsureCapacity(Count + 1);
--- a/src/Markdig/Syntax/Inlines/ContainerInline.cs
+++ b/src/Markdig/Syntax/Inlines/ContainerInline.cs
@@ -1,9 +1,11 @@
 // Copyright (c) Alexandre Mutel. All rights reserved.
 // This file is licensed under the BSD-Clause 2 license.
 // See the license.txt file in the project root for more information.
+using Markdig.Helpers;
 using System;
 using System.Collections;
 using System.Collections.Generic;
+using System.Diagnostics;
 using System.IO;

 namespace Markdig.Syntax.Inlines
@@ -94,8 +96,18 @@ namespace Markdig.Syntax.Inlines
        /// <returns>An enumeration of T</returns>
        public IEnumerable<T> FindDescendants<T>() where T : Inline
        {
-            // Fast-path an empty container to avoid allocating a Stack
-            if (LastChild == null) yield break;
+            if (FirstChild is null)
+            {
+                return ArrayHelper<T>.Empty;
+            }
+            else
+            {
+                return FindDescendantsInternal<T>();
+            }
+        }
+        internal IEnumerable<T> FindDescendantsInternal<T>() where T : MarkdownObject
+        {
+            Debug.Assert(typeof(T).IsSubclassOf(typeof(Inline)));

            Stack<Inline> stack = new Stack<Inline>();

--- a/src/Markdig/Syntax/MarkdownObjectExtensions.cs
+++ b/src/Markdig/Syntax/MarkdownObjectExtensions.cs
@@ -3,6 +3,8 @@
 // See the license.txt file in the project root for more information.

 using System.Collections.Generic;
+using System.Diagnostics;
+using Markdig.Helpers;
 using Markdig.Syntax.Inlines;

 namespace Markdig.Syntax
@@ -20,10 +22,6 @@ namespace Markdig.Syntax
        /// <returns>An iteration over the descendant elements</returns>
        public static IEnumerable<MarkdownObject> Descendants(this MarkdownObject markdownObject)
        {
-            // Fast-path an object with no children to avoid allocating Stack objects
-            if (!(markdownObject is ContainerBlock) && !(markdownObject is ContainerInline)) yield break;
-
-            // TODO: A single Stack<(MarkdownObject block, bool push)> when ValueTuples are available
            Stack<MarkdownObject> stack = new Stack<MarkdownObject>();
            Stack<bool> pushStack = new Stack<bool>();

@@ -66,7 +64,41 @@ namespace Markdig.Syntax
        }

        /// <summary>
-        /// Iterates over the descendant elements for the specified markdown <see cref="Inline" /> element and filters by the type {T}.
+        /// Iterates over the descendant elements for the specified markdown element, including <see cref="Block"/> and <see cref="Inline"/> and filters by the type <typeparamref name="T"/>.
+        /// <para>The descendant elements are returned in DFS-like order.</para>
+        /// </summary>
+        /// <typeparam name="T">Type to use for filtering the descendants</typeparam>
+        /// <param name="markdownObject">The markdown object.</param>
+        /// <returns>An iteration over the descendant elements</returns>
+        public static IEnumerable<T> Descendants<T>(this MarkdownObject markdownObject) where T : MarkdownObject
+        {
+            if (typeof(T).IsSubclassOf(typeof(Block)))
+            {
+                if (markdownObject is ContainerBlock containerBlock && containerBlock.Count > 0)
+                {
+                    return BlockDescendantsInternal<T>(containerBlock);
+                }
+            }
+            else // typeof(T).IsSubclassOf(typeof(Inline)))
+            {
+                if (markdownObject is ContainerBlock containerBlock)
+                {
+                    if (containerBlock.Count > 0)
+                    {
+                        return InlineDescendantsInternal<T>(containerBlock);
+                    }
+                }
+                else if (markdownObject is ContainerInline containerInline && containerInline.FirstChild != null)
+                {
+                    return containerInline.FindDescendantsInternal<T>();
+                }
+            }
+
+            return ArrayHelper<T>.Empty;
+        }
+
+        /// <summary>
+        /// Iterates over the descendant elements for the specified markdown <see cref="Inline" /> element and filters by the type <typeparamref name="T"/>.
        /// </summary>
        /// <typeparam name="T">Type to use for filtering the descendants</typeparam>
        /// <param name="inline">The inline markdown object.</param>
@@ -77,7 +109,7 @@ namespace Markdig.Syntax
            => inline.FindDescendants<T>();

        /// <summary>
-        /// Iterates over the descendant elements for the specified markdown <see cref="Block" /> element and filters by the type {T}.
+        /// Iterates over the descendant elements for the specified markdown <see cref="Block" /> element and filters by the type <typeparamref name="T"/>.
        /// </summary>
        /// <typeparam name="T">Type to use for filtering the descendants</typeparam>
        /// <param name="block">The markdown object.</param>
@@ -86,8 +118,19 @@ namespace Markdig.Syntax
        /// </returns>
        public static IEnumerable<T> Descendants<T>(this ContainerBlock block) where T : Block
        {
-            // Fast-path an empty container to avoid allocating a Stack
-            if (block.Count == 0) yield break;
+            if (block != null && block.Count > 0)
+            {
+                return BlockDescendantsInternal<T>(block);
+            }
+            else
+            {
+                return ArrayHelper<T>.Empty;
+            }
+        }
+
+        private static IEnumerable<T> BlockDescendantsInternal<T>(ContainerBlock block) where T : MarkdownObject
+        {
+            Debug.Assert(typeof(T).IsSubclassOf(typeof(Block)));

            Stack<Block> stack = new Stack<Block>();

@@ -115,5 +158,18 @@ namespace Markdig.Syntax
                }
            }
        }
+
+        private static IEnumerable<T> InlineDescendantsInternal<T>(ContainerBlock block) where T : MarkdownObject
+        {
+            Debug.Assert(typeof(T).IsSubclassOf(typeof(Inline)));
+
+            foreach (MarkdownObject descendant in block.Descendants())
+            {
+                if (descendant is T descendantT)
+                {
+                    yield return descendantT;
+                }
+            }
+        }
    }
 }
--- a/src/Markdig/Syntax/SourceSpan.cs
+++ b/src/Markdig/Syntax/SourceSpan.cs
@@ -55,8 +55,7 @@ namespace Markdig.Syntax

        public override bool Equals(object obj)
        {
-            if (ReferenceEquals(null, obj)) return false;
-            return obj is SourceSpan && Equals((SourceSpan) obj);
+            return obj is SourceSpan sourceSpan && Equals(sourceSpan);
        }

        public override int GetHashCode()
--- a/src/SpecFileGen/SpecFileGen.csproj
+++ b/src/SpecFileGen/SpecFileGen.csproj
@@ -2,7 +2,8 @@

  <PropertyGroup>
    <OutputType>Exe</OutputType>
-    <TargetFramework>netcoreapp2.2</TargetFramework>
+    <TargetFramework>netcoreapp2.1</TargetFramework>
+    <IsPackable>false</IsPackable>
  </PropertyGroup>

 </Project>
--- a/src/UnicodeNormDApp/Properties/AssemblyInfo.cs
+++ b/src/UnicodeNormDApp/Properties/AssemblyInfo.cs
@@ -1,36 +0,0 @@
-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("UnicodeNormDApp")]
-[assembly: AssemblyDescription("")]
-[assembly: AssemblyConfiguration("")]
-[assembly: AssemblyCompany("")]
-[assembly: AssemblyProduct("UnicodeNormDApp")]
-[assembly: AssemblyCopyright("Copyright ©  2016")]
-[assembly: AssemblyTrademark("")]
-[assembly: AssemblyCulture("")]
-
-// 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("33ffc0b9-0187-44f9-9424-bb5af5b4fb84")]
-
-// 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")]
--- a/src/UnicodeNormDApp/UnicodeNormDApp.csproj
+++ b/src/UnicodeNormDApp/UnicodeNormDApp.csproj
@@ -1,56 +1,7 @@
-<?xml version="1.0" encoding="utf-8"?>
-<Project ToolsVersion="14.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
-    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
-    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
-    <ProjectGuid>{33FFC0B9-0187-44F9-9424-BB5AF5B4FB84}</ProjectGuid>
    <OutputType>Exe</OutputType>
-    <AppDesignerFolder>Properties</AppDesignerFolder>
-    <RootNamespace>UnicodeNormDApp</RootNamespace>
-    <AssemblyName>UnicodeNormDApp</AssemblyName>
-    <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
-    <FileAlignment>512</FileAlignment>
+    <TargetFramework>netcoreapp3.0</TargetFramework>
+    <IsPackable>false</IsPackable>
  </PropertyGroup>
-  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
-    <PlatformTarget>AnyCPU</PlatformTarget>
-    <DebugSymbols>true</DebugSymbols>
-    <DebugType>full</DebugType>
-    <Optimize>false</Optimize>
-    <OutputPath>bin\Debug\</OutputPath>
-    <DefineConstants>DEBUG;TRACE</DefineConstants>
-    <ErrorReport>prompt</ErrorReport>
-    <WarningLevel>4</WarningLevel>
-  </PropertyGroup>
-  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
-    <PlatformTarget>AnyCPU</PlatformTarget>
-    <DebugType>pdbonly</DebugType>
-    <Optimize>true</Optimize>
-    <OutputPath>bin\Release\</OutputPath>
-    <DefineConstants>TRACE</DefineConstants>
-    <ErrorReport>prompt</ErrorReport>
-    <WarningLevel>4</WarningLevel>
-  </PropertyGroup>
-  <ItemGroup>
-    <Reference Include="System" />
-    <Reference Include="System.Core" />
-    <Reference Include="System.Net" />
-    <Reference Include="System.Xml.Linq" />
-    <Reference Include="System.Data.DataSetExtensions" />
-    <Reference Include="Microsoft.CSharp" />
-    <Reference Include="System.Data" />
-    <Reference Include="System.Xml" />
-  </ItemGroup>
-  <ItemGroup>
-    <Compile Include="Program.cs" />
-    <Compile Include="Properties\AssemblyInfo.cs" />
-  </ItemGroup>
-  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
-  <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
-       Other similar extension points exist, see Microsoft.Common.targets.
-  <Target Name="BeforeBuild">
-  </Target>
-  <Target Name="AfterBuild">
-  </Target>
-  -->
 </Project>
--- a/src/markdig.sln
+++ b/src/markdig.sln
@@ -5,8 +5,8 @@ VisualStudioVersion = 16.0.28407.52
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Build", "Build", "{061866E2-005C-4D13-A338-EA464BBEC60F}"
 	ProjectSection(SolutionItems) = preProject
-		..\appveyor.yml = ..\appveyor.yml
 		..\changelog.md = ..\changelog.md
+		..\.github\workflows\ci.yml = ..\.github\workflows\ci.yml
 		..\license.txt = ..\license.txt
 		..\readme.md = ..\readme.md
 	EndProjectSection
@@ -15,7 +15,7 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Markdig", "Markdig\Markdig.
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Markdig.Signed", "Markdig.Signed\Markdig.Signed.csproj", "{C37C7B94-1219-4ED9-ABAC-C0B4B8FE8750}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Markdig.Tests", "Markdig.Tests\Markdig.Tests.csproj", "{A0C5CB5F-5568-40AB-B945-D6D2664D51B0}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Markdig.Tests", "Markdig.Tests\Markdig.Tests.csproj", "{A0C5CB5F-5568-40AB-B945-D6D2664D51B0}"
 	ProjectSection(ProjectDependencies) = postProject
 		{8A58A7E2-627C-4F41-933F-5AC92ADFAB48} = {8A58A7E2-627C-4F41-933F-5AC92ADFAB48}
 	EndProjectSection
@@ -27,11 +27,11 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Markdig.Benchmarks", "Markd
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Markdig.WebApp", "Markdig.WebApp\Markdig.WebApp.csproj", "{3CAD9801-9976-46BE-BACA-F6D0D21FDC00}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "UnicodeNormDApp", "UnicodeNormDApp\UnicodeNormDApp.csproj", "{33FFC0B9-0187-44F9-9424-BB5AF5B4FB84}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "UnicodeNormDApp", "UnicodeNormDApp\UnicodeNormDApp.csproj", "{33FFC0B9-0187-44F9-9424-BB5AF5B4FB84}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "mdtoc", "mdtoc\mdtoc.csproj", "{E3CDFF0F-5BFC-42E9-BDBA-2797651900A2}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "mdtoc", "mdtoc\mdtoc.csproj", "{E3CDFF0F-5BFC-42E9-BDBA-2797651900A2}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SpecFileGen", "SpecFileGen\SpecFileGen.csproj", "{DB6E2ED5-7884-4E97-84AF-35E2480CF685}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "SpecFileGen", "SpecFileGen\SpecFileGen.csproj", "{DB6E2ED5-7884-4E97-84AF-35E2480CF685}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
--- a/src/mdtoc/App.config
+++ b/src/mdtoc/App.config
@@ -1,6 +0,0 @@
-<?xml version="1.0" encoding="utf-8" ?>
-<configuration>
-    <startup> 
-        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.6.1" />
-    </startup>
-</configuration>
--- a/src/mdtoc/Properties/AssemblyInfo.cs
+++ b/src/mdtoc/Properties/AssemblyInfo.cs
@@ -1,39 +0,0 @@
-// Copyright (c) Alexandre Mutel. All rights reserved.
-// This file is licensed under the BSD-Clause 2 license. 
-// See the license.txt 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("mdtoc")]
-[assembly: AssemblyDescription("")]
-[assembly: AssemblyConfiguration("")]
-[assembly: AssemblyCompany("Alexandre Mutel")]
-[assembly: AssemblyProduct("mdtoc")]
-[assembly: AssemblyCopyright("Copyright © 2017 - Alexandre Mutel")]
-[assembly: AssemblyTrademark("")]
-[assembly: AssemblyCulture("")]
-
-// 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("e3cdff0f-5bfc-42e9-bdba-2797651900a2")]
-
-// 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")]
--- a/src/mdtoc/mdtoc.csproj
+++ b/src/mdtoc/mdtoc.csproj
@@ -1,58 +1,10 @@
-<?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('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
-    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
-    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
-    <ProjectGuid>{E3CDFF0F-5BFC-42E9-BDBA-2797651900A2}</ProjectGuid>
    <OutputType>Exe</OutputType>
-    <RootNamespace>mdtoc</RootNamespace>
-    <AssemblyName>mdtoc</AssemblyName>
-    <TargetFrameworkVersion>v4.6.1</TargetFrameworkVersion>
-    <FileAlignment>512</FileAlignment>
-    <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
-  </PropertyGroup>
-  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
-    <PlatformTarget>AnyCPU</PlatformTarget>
-    <DebugSymbols>true</DebugSymbols>
-    <DebugType>full</DebugType>
-    <Optimize>false</Optimize>
-    <OutputPath>bin\Debug\</OutputPath>
-    <DefineConstants>DEBUG;TRACE</DefineConstants>
-    <ErrorReport>prompt</ErrorReport>
-    <WarningLevel>4</WarningLevel>
-  </PropertyGroup>
-  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
-    <PlatformTarget>AnyCPU</PlatformTarget>
-    <DebugType>pdbonly</DebugType>
-    <Optimize>true</Optimize>
-    <OutputPath>bin\Release\</OutputPath>
-    <DefineConstants>TRACE</DefineConstants>
-    <ErrorReport>prompt</ErrorReport>
-    <WarningLevel>4</WarningLevel>
+    <TargetFramework>netcoreapp3.0</TargetFramework>
+    <IsPackable>false</IsPackable>
  </PropertyGroup>
  <ItemGroup>
-    <Reference Include="System" />
-    <Reference Include="System.Core" />
-    <Reference Include="System.Xml.Linq" />
-    <Reference Include="System.Data.DataSetExtensions" />
-    <Reference Include="Microsoft.CSharp" />
-    <Reference Include="System.Data" />
-    <Reference Include="System.Net.Http" />
-    <Reference Include="System.Xml" />
+    <ProjectReference Include="..\Markdig\Markdig.csproj" />
  </ItemGroup>
-  <ItemGroup>
-    <Compile Include="Program.cs" />
-    <Compile Include="Properties\AssemblyInfo.cs" />
-  </ItemGroup>
-  <ItemGroup>
-    <None Include="App.config" />
-  </ItemGroup>
-  <ItemGroup>
-    <ProjectReference Include="..\Markdig\Markdig.csproj">
-      <Project>{8a58a7e2-627c-4f41-933f-5ac92adfab48}</Project>
-      <Name>Markdig</Name>
-    </ProjectReference>
-  </ItemGroup>
-  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
 </Project>
Author	SHA1	Message	Date
Alexandre Mutel	9af462e412	Bump to 0.18.2	2020-03-08 10:15:30 +01:00
Alexandre Mutel	e1ba52da20	Merge pull request #406 from FranklinWhale/patch-1 Make output of HtmlTableRenderer XML wellformed	2020-03-08 10:09:29 +01:00
Alexandre Mutel	70ee97d5c7	Merge pull request #404 from webmaster442/master Fixes issue #303	2020-03-08 10:09:03 +01:00
Alexandre Mutel	da916a1700	Merge pull request #402 from KrisVandermotten/HeadingRendererBugFix Fixed a bug in HeadingRenderer	2020-03-08 10:08:47 +01:00
Franklin Tse	5548246703	Update TestPlayParser.cs	2020-03-06 19:00:37 +08:00
Franklin Tse	097fc5c4e0	Update GridTableSpecs.md	2020-03-06 18:55:00 +08:00
Franklin Tse	168ad39ff6	Make output of HtmlTableRenderer XML wellformed	2020-03-06 18:49:22 +08:00
Alexandre Mutel	54e065aabe	Merge pull request #405 from bbodenmiller/patch-1 Github -> GitHub	2020-03-06 08:56:56 +01:00
Ben Bodenmiller	98d58797d9	Github -> GitHub	2020-03-05 23:55:39 -08:00
Ruzsinszki Gábor	2f0dd2a6a7	Fixes issue #303	2020-03-03 11:10:17 +01:00
Kris Vandermotten	247209870e	Fixed a bug in HeadingRenderer	2020-03-01 14:44:41 +01:00
Alexandre Mutel	ef5b958267	Merge pull request #399 from KrisVandermotten/StringLineGroup Some optimizations in StringLineGroup	2020-02-18 21:01:55 +01:00
Kris Vandermotten	7d61df2c0c	Some optimizations in StringLineGroup	2020-02-15 10:34:24 +01:00
Alexandre Mutel	51f9da1974	Merge pull request #396 from KrisVandermotten/CharacterMapBitVector128 Use BitVector128 in CharacterMap<T>	2020-02-06 06:56:32 +01:00
Kris Vandermotten	9321628b9c	Use uint instead of ulong	2020-02-05 22:38:21 +01:00
Kris Vandermotten	525e2c7fb8	Use BitVector128 in CharacterMap<T>	2020-02-04 22:45:42 +01:00
Alexandre Mutel	1f9b70636f	Merge pull request #394 from KrisVandermotten/charactermap Use HashSet<T> instead of Dictionary<TKey, TValue> in CharacterMap<T>	2020-01-31 18:43:24 +01:00
Kris Vandermotten	d4f43f826f	Use HashSet<T> instead of Dictionary<TKey, TValue> in CharacterMap<T>	2020-01-31 18:35:28 +01:00
Alexandre Mutel	62788b1101	Merge pull request #393 from MihaZupan/line-reader Optimize LineReader.ReadLine	2020-01-31 08:01:42 +01:00
MihaZupan	c3c4d37b82	Optimize LineReader.ReadLine	2020-01-30 21:14:06 +01:00
Alexandre Mutel	333bf04274	Update ci.yml, fix publish	2020-01-29 08:14:26 +01:00
Alexandre Mutel	dab4b7176d	Merge pull request #392 from RudeySH/patch-1 Add Bootstrap and YAML to exclusion list in readme	2020-01-27 19:00:14 +01:00
Rudey	25ec56e1be	Change frontmatter to Front Matter	2020-01-27 18:50:25 +01:00
Rudey	3455fd12da	Add Bootstrap and YAML to exclusion list in readme Both the Bootstrap and YAML frontmatter aren't included in `UseAdvancedExtensions`, but the readme didn't specify that.	2020-01-27 18:30:53 +01:00
Alexandre Mutel	ae5d47a0ed	Merge pull request #391 from MihaZupan/remove-uap-remains Remove UAP specific code	2020-01-27 08:36:14 +01:00
MihaZupan	1ff721d512	Remove UAP specific code	2020-01-26 23:04:57 +01:00
Alexandre Mutel	2c130504e2	Merge pull request #389 from MihaZupan/code-coverage Improve code coverage	2020-01-26 22:01:06 +01:00
Alexandre Mutel	6405b16692	Migrate to GitHub Actions	2020-01-26 19:42:23 +01:00
Alexandre Mutel	2e1912a23d	Update projects to compile with dotnet build/test, remove uap10.0	2020-01-26 19:35:21 +01:00
MihaZupan	71c680388c	Make ExcludeFromCodeCoverage compatibility stub internal	2020-01-22 02:27:50 +01:00
MihaZupan	3f50b3fd0b	Add LinkHelper.UrilizeAsGfm tests	2020-01-22 02:18:24 +01:00
MihaZupan	99b250b4c9	Add ContainerBlock tests	2020-01-22 02:06:42 +01:00
MihaZupan	655bf13df0	Exclude CompactPrefixTree from code coverage	2020-01-22 01:43:12 +01:00
MihaZupan	d2c89a3a06	Add tests for core Markdown apis	2020-01-22 01:42:23 +01:00
MihaZupan	754d11fd44	Fix test execution inside VS Enterprise Live Unit Testing	2020-01-21 21:44:29 +01:00
MihaZupan	1252e49ba4	Add more custom emoji tests	2020-01-21 18:36:36 +01:00
MihaZupan	d18487ae53	Fix StringLineGroupIterator.PeekChar for cross-line peeks	2020-01-21 18:16:13 +01:00
MihaZupan	f401d5082e	Add SmartyPants tests	2020-01-21 17:35:58 +01:00
Alexandre Mutel	dd6418d108	Bump to 0.18.1	2020-01-21 08:30:32 +01:00
Alexandre Mutel	7875e4bce9	Merge pull request #387 from MihaZupan/descendants-api Add missing Descendants<T> api	2020-01-21 08:24:13 +01:00
Alexandre Mutel	2e1b1a1fdc	Merge pull request #386 from mlaily/emoji-customization Emojis and smileys customization	2020-01-21 08:23:48 +01:00
MihaZupan	fa2b157c1a	Improve some CharHelper methods	2020-01-21 01:31:44 +01:00
MihaZupan	e4e6406546	Add missing Descendants<T> overload	2020-01-21 01:03:47 +01:00
Melvyn Laïly	1cff10270a	Set the default emoji dictionaries capacity in their ctor	2020-01-16 09:12:05 +01:00
Melvyn Laïly	87023184cb	Clarify emoji terminology (emoji "shortcode")	2020-01-16 09:12:04 +01:00
Melvyn Laïly	aecdf2192e	Improve the emoji extension (code review remarks)	2020-01-16 09:12:04 +01:00
Melvyn Laïly	0a36382126	Update changelog	2020-01-16 09:12:04 +01:00
Melvyn Laïly	0057b368ec	Add unit tests for custom emojis and smileys	2020-01-16 09:11:04 +01:00
Melvyn Laïly	3033284096	Re-allow emojis and smileys customization (this feature was broken in #308)	2020-01-16 09:11:03 +01:00
Alexandre Mutel	9b1b791b18	Merge pull request #341 from OpportunityLiu/master Add customizable media link; handle protocol-less media	2020-01-15 13:27:06 +01:00
Opportunity	2b7d205701	Merge branch 'master' into master	2020-01-15 19:35:17 +08:00
Opportunity	89b28659b1	Update src/Markdig/Extensions/MediaLinks/HostProviderBuilder.cs Co-Authored-By: Alexandre Mutel <alexandre_mutel@live.com>	2020-01-15 19:32:37 +08:00
Opportunity	4d172bf905	Merge branch 'master' into master	2019-10-01 21:31:02 +08:00
Opportunity	890b2cda2a	Update MediaLinkExtension.cs	2019-09-30 21:09:44 +08:00
OpportunityLiu	8886b48634	add tests	2019-05-16 15:58:02 +08:00
OpportunityLiu	64cd8ec262	customize iframe class of each provider	2019-05-15 10:48:12 +08:00
OpportunityLiu	a1e19912a9	update changelog	2019-05-14 17:32:09 +08:00
OpportunityLiu	ca51967fb1	fix #135	2019-05-14 17:31:03 +08:00
OpportunityLiu	bb3a4f372c	add change log	2019-05-14 16:07:14 +08:00
OpportunityLiu	1d6a464c5d	add unit test	2019-05-14 15:59:05 +08:00
OpportunityLiu	0fe5c17a93	Add customizable media link	2019-05-14 15:30:15 +08:00