mirror of
https://github.com/xoofx/markdig.git
synced 2026-02-08 05:44:58 +00:00
Add support for the autolink extension (issue #64)
This commit is contained in:
Alexandre Mutel
@@ -75,6 +75,7 @@
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<ItemGroup>
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<None Include="App.config" />
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<None Include="project.json" />
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<None Include="Specs\AutoLinks.md" />
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<None Include="Specs\AutoIdentifierSpecs.md" />
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<None Include="Specs\AbbreviationSpecs.md" />
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<None Include="Specs\FigureFooterAndCiteSpecs.md" />
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46
src/Markdig.Tests/Specs/AutoLinks.md
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46
src/Markdig.Tests/Specs/AutoLinks.md
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@@ -0,0 +1,46 @@
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# Extensions
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This section describes the different extensions supported:
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## AutoLinks
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Autolinks will format as a HTML link any string that starts by:
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- `http://` or `https://`
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- `ftp://`
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- `mailto:`
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- `www.`
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```````````````````````````````` example
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This is a http://www.google.com URL and https://www.google.com
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This is a ftp://test.com
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And a mailto:email@toto.com
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And a plain www.google.com
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.
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<p>This is a <a href="http://www.google.com">http://www.google.com</a> URL and <a href="https://www.google.com">https://www.google.com</a>
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This is a <a href="ftp://test.com">ftp://test.com</a>
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And a <a href="mailto:email@toto.com">mailto:email@toto.com</a>
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And a plain <a href="http://www.google.com">www.google.com</a></p>
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````````````````````````````````
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But incomplete links will not be matched:
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```````````````````````````````` example
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This is not a http:/www.google.com URL and https:/www.google.com
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This is not a ftp:/test.com
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And not a mailto:emailtoto.com
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And not a plain www. or a www.x
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.
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<p>This is not a http:/www.google.com URL and https:/www.google.com
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This is not a ftp:/test.com
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And not a mailto:emailtoto.com
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And not a plain www. or a www.x</p>
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````````````````````````````````
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Previous character must be a punctuation or a valid space (tab, space, new line):
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```````````````````````````````` example
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This is not a nhttp://www.google.com URL but this is (https://www.google.com)
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.
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<p>This is not a nhttp://www.google.com URL but this is (<a href="https://www.google.com">https://www.google.com</a>)</p>
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````````````````````````````````
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@@ -20115,4 +20115,87 @@ namespace Markdig.Tests
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TestParser.TestSpec("----\nthis: is a frontmatter\n----\nThis is a text", "<hr />\n<h2>this: is a frontmatter</h2>\n<p>This is a text</p>", "yaml");
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}
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}
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// # Extensions
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//
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// This section describes the different extensions supported:
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//
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// ## AutoLinks
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//
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// Autolinks will format as a HTML link any string that starts by:
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//
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// - `http://` or `https://`
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// - `ftp://`
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// - `mailto:`
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// - `www.`
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[TestFixture]
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public partial class TestExtensionsAutoLinks
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{
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[Test]
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public void Example001()
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{
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// Example 1
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// Section: Extensions AutoLinks
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//
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// The following CommonMark:
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// This is a http://www.google.com URL and https://www.google.com
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// This is a ftp://test.com
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// And a mailto:email@toto.com
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// And a plain www.google.com
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//
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// Should be rendered as:
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// <p>This is a <a href="http://www.google.com">http://www.google.com</a> URL and <a href="https://www.google.com">https://www.google.com</a>
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// This is a <a href="ftp://test.com">ftp://test.com</a>
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// And a <a href="mailto:email@toto.com">mailto:email@toto.com</a>
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// And a plain <a href="http://www.google.com">www.google.com</a></p>
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Console.WriteLine("Example {0}" + Environment.NewLine + "Section: {0}" + Environment.NewLine, 1, "Extensions AutoLinks");
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TestParser.TestSpec("This is a http://www.google.com URL and https://www.google.com\nThis is a ftp://test.com\nAnd a mailto:email@toto.com\nAnd a plain www.google.com", "<p>This is a <a href=\"http://www.google.com\">http://www.google.com</a> URL and <a href=\"https://www.google.com\">https://www.google.com</a>\nThis is a <a href=\"ftp://test.com\">ftp://test.com</a>\nAnd a <a href=\"mailto:email@toto.com\">mailto:email@toto.com</a>\nAnd a plain <a href=\"http://www.google.com\">www.google.com</a></p>", "autolinks|advanced");
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}
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}
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// But incomplete links will not be matched:
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[TestFixture]
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public partial class TestExtensionsAutoLinks
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{
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[Test]
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public void Example002()
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{
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// Example 2
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// Section: Extensions AutoLinks
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//
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// The following CommonMark:
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// This is not a http:/www.google.com URL and https:/www.google.com
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// This is not a ftp:/test.com
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// And not a mailto:emailtoto.com
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// And not a plain www. or a www.x
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//
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// Should be rendered as:
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// <p>This is not a http:/www.google.com URL and https:/www.google.com
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// This is not a ftp:/test.com
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// And not a mailto:emailtoto.com
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// And not a plain www. or a www.x</p>
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Console.WriteLine("Example {0}" + Environment.NewLine + "Section: {0}" + Environment.NewLine, 2, "Extensions AutoLinks");
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TestParser.TestSpec("This is not a http:/www.google.com URL and https:/www.google.com\nThis is not a ftp:/test.com\nAnd not a mailto:emailtoto.com\nAnd not a plain www. or a www.x ", "<p>This is not a http:/www.google.com URL and https:/www.google.com\nThis is not a ftp:/test.com\nAnd not a mailto:emailtoto.com\nAnd not a plain www. or a www.x</p>", "autolinks|advanced");
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}
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}
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// Previous character must be a punctuation or a valid space (tab, space, new line):
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[TestFixture]
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public partial class TestExtensionsAutoLinks
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{
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[Test]
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public void Example003()
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{
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// Example 3
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// Section: Extensions AutoLinks
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//
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// The following CommonMark:
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// This is not a nhttp://www.google.com URL but this is (https://www.google.com)
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//
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// Should be rendered as:
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// <p>This is not a nhttp://www.google.com URL but this is (<a href="https://www.google.com">https://www.google.com</a>)</p>
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Console.WriteLine("Example {0}" + Environment.NewLine + "Section: {0}" + Environment.NewLine, 3, "Extensions AutoLinks");
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TestParser.TestSpec("This is not a nhttp://www.google.com URL but this is (https://www.google.com)", "<p>This is not a nhttp://www.google.com URL but this is (<a href=\"https://www.google.com\">https://www.google.com</a>)</p>", "autolinks|advanced");
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}
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}
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}
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@@ -61,6 +61,7 @@ SOFTWARE.
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new KeyValuePair<string, string>(Host.ResolvePath("DiagramsSpecs.md"), "diagrams|advanced"),
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new KeyValuePair<string, string>(Host.ResolvePath("NoHtmlSpecs.md"), "nohtml"),
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new KeyValuePair<string, string>(Host.ResolvePath("YamlSpecs.md"), "yaml"),
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new KeyValuePair<string, string>(Host.ResolvePath("AutoLinks.md"), "autolinks|advanced"),
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};
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var emptyLines = false;
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var displayEmptyLines = false;
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29
src/Markdig/Extensions/AutoLinks/AutoLinkExtension.cs
Normal file
29
src/Markdig/Extensions/AutoLinks/AutoLinkExtension.cs
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@@ -0,0 +1,29 @@
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// Copyright (c) Alexandre Mutel. All rights reserved.
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// This file is licensed under the BSD-Clause 2 license.
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// See the license.txt file in the project root for more information.
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using Markdig.Renderers;
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using Markdig.Syntax.Inlines;
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namespace Markdig.Extensions.AutoLinks
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{
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/// <summary>
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/// Extension to automatically create <see cref="LinkInline"/> when a link url http: or mailto: is found.
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/// </summary>
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/// <seealso cref="Markdig.IMarkdownExtension" />
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public class AutoLinkExtension : IMarkdownExtension
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{
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public void Setup(MarkdownPipelineBuilder pipeline)
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{
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if (!pipeline.InlineParsers.Contains<AutoLinkParser>())
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{
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// Insert the parser before any other parsers
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pipeline.InlineParsers.Insert(0, new AutoLinkParser());
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}
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}
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public void Setup(IMarkdownRenderer renderer)
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{
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}
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}
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}
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143
src/Markdig/Extensions/AutoLinks/AutoLinkParser.cs
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143
src/Markdig/Extensions/AutoLinks/AutoLinkParser.cs
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@@ -0,0 +1,143 @@
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// Copyright (c) Alexandre Mutel. All rights reserved.
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// This file is licensed under the BSD-Clause 2 license.
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// See the license.txt file in the project root for more information.
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using System;
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using Markdig.Helpers;
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using Markdig.Parsers;
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using Markdig.Syntax.Inlines;
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namespace Markdig.Extensions.AutoLinks
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{
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/// <summary>
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/// The inline parser used to for autolinks.
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/// </summary>
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/// <seealso cref="Markdig.Parsers.InlineParser" />
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public class AutoLinkParser : InlineParser
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{
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/// <summary>
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/// Initializes a new instance of the <see cref="AutoLinkParser"/> class.
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/// </summary>
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public AutoLinkParser()
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{
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OpeningCharacters = new char[]
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{
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'h', // for http:// and https://
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'f', // for ftp://
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'm', // for mailto:
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'w', // for www.
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};
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}
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public override bool Match(InlineProcessor processor, ref StringSlice slice)
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{
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string match;
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// Previous char must be a whitespace or a punctuation
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var previousChar = slice.PeekCharExtra(-1);
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if (!previousChar.IsAsciiPunctuation() && !previousChar.IsWhiteSpaceOrZero())
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{
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return false;
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}
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var startPosition = slice.Start;
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var c = slice.CurrentChar;
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// Precheck URL
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switch (c)
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{
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case 'h':
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if (!slice.MatchLowercase("ttp://", 1) && !slice.MatchLowercase("ttps://", 1))
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{
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return false;
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}
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break;
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case 'f':
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if (!slice.MatchLowercase("tp://", 1))
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{
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return false;
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}
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break;
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case 'm':
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if (!slice.MatchLowercase("ailto:", 1))
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{
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return false;
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}
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break;
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case 'w':
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if (!slice.MatchLowercase("ww.", 1) || previousChar == '/') // We won't match http:/www. or /www.xxx
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{
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return false;
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}
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break;
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}
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// Parse URL
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string link;
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if (!LinkHelper.TryParseUrl(ref slice, out link))
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{
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return false;
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}
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// Post-check URL
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switch (c)
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{
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case 'h':
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if (string.Equals(link, "http://", StringComparison.OrdinalIgnoreCase) ||
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string.Equals(link, "https://", StringComparison.OrdinalIgnoreCase))
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{
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return false;
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}
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break;
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case 'f':
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if (string.Equals(link, "ftp://", StringComparison.OrdinalIgnoreCase))
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{
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return false;
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}
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break;
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case 'm':
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if (string.Equals(link, "mailto:", StringComparison.OrdinalIgnoreCase) || !link.Contains("@"))
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{
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return false;
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}
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break;
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case 'w':
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// We require at least two .
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if (link.Length <= "www.x.y".Length || link.IndexOf(".", 4, StringComparison.Ordinal) < 0)
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{
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return false;
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}
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break;
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}
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int line;
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int column;
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var inline = new LinkInline()
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{
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Span =
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{
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Start = processor.GetSourcePosition(startPosition, out line, out column),
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},
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Line = line,
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Column = column,
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Url = c == 'w' ? "http://" + link : link,
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IsClosed = true,
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};
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inline.Span.End = inline.Span.Start + link.Length - 1;
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inline.UrlSpan = inline.Span;
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inline.AppendChild(new LiteralInline()
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{
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Span = inline.Span,
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Line = line,
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Column = column,
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Content = new StringSlice(slice.Text, startPosition, startPosition + link.Length - 1),
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IsClosed = true
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});
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processor.Inline = inline;
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return true;
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}
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}
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}
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@@ -168,6 +168,17 @@ namespace Markdig.Helpers
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return i == text.Length;
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}
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/// <summary>
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/// Matches the specified text using lowercase comparison.
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/// </summary>
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/// <param name="text">The text.</param>
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/// <param name="offset">The offset.</param>
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/// <returns><c>true</c> if the text matches; <c>false</c> otherwise</returns>
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public bool MatchLowercase(string text, int offset = 0)
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{
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return MatchLowercase(text, End, offset);
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}
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/// <summary>
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/// Matches the specified text using lowercase comparison.
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/// </summary>
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@@ -5,6 +5,7 @@
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using System;
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using Markdig.Extensions.Abbreviations;
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using Markdig.Extensions.AutoIdentifiers;
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using Markdig.Extensions.AutoLinks;
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using Markdig.Extensions.Bootstrap;
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using Markdig.Extensions.Citations;
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using Markdig.Extensions.CustomContainers;
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@@ -62,9 +63,22 @@ namespace Markdig
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.UseListExtras()
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.UseTaskLists()
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.UseDiagrams()
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.UseAutoLinks()
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.UseGenericAttributes(); // Must be last as it is one parser that is modifying other parsers
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}
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/// <summary>
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/// Uses this extension to enable autolinks from text `http://`, `https://`, `ftp://`, `mailto:`, `www.xxx.yyy`
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/// </summary>
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/// <param name="pipeline">The pipeline.</param>
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/// <returns>The modified pipeline</returns>
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public static MarkdownPipelineBuilder UseAutoLinks(this MarkdownPipelineBuilder pipeline)
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{
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pipeline.Extensions.AddIfNotAlready<AutoLinkExtension>();
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return pipeline;
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}
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/// <summary>
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/// Uses this extension to disable URI escape with % characters for non-US-ASCII characters in order to workaround a bug under IE/Edge with local file links containing non US-ASCII chars. DO NOT USE OTHERWISE.
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/// </summary>
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@@ -522,6 +536,9 @@ namespace Markdig
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case "nonascii-noescape":
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pipeline.UseNonAsciiNoEscape();
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break;
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case "autolinks":
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pipeline.UseAutoLinks();
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break;
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default:
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throw new ArgumentException($"Invalid extension `{extension}` from `{extensions}`", nameof(extensions));
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}
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Reference in New Issue
Block a user