Minimum PHP Version

The minimum supported PHP version was increased from 7.1 to 7.4.

CommonMarkConverter and GithubFlavoredMarkdownConverter constructors

The constructor methods for both CommonMarkConverter and GithubFlavoredMarkdownConverter no longer accept passing in a customized Environment. If you want to customize the extensions used in your converter you should switch to using MarkdownConverter. See the Basic Usage documentation for an example.

-use League\CommonMark\CommonMarkConverter;
 use League\CommonMark\Environment\Environment;
 use League\CommonMark\Extension\CommonMark\CommonMarkCoreExtension;
 use League\CommonMark\Extension\Table\TableExtension;
+use League\CommonMark\MarkdownConverter;
 $config = [
     'html_input' => 'escape',
     'allow_unsafe_links' => false,
     'max_nesting_level' => 100,
-$environment = new Environment();
+$environment = new Environment($config);
 $environment->addExtension(new CommonMarkCoreExtension());
 $environment->addExtension(new TableExtension());
-$converter = new CommonMarkConverter($config, $environment); // or GithubFlavoredMarkdownConverter
+$converter = new MarkdownConverter($environment);
 echo $converter->convertToHtml('Hello World!');

CommonMarkConverter Return Type

In 1.x, calling convertToHtml() would return a string. In 2.x this changed to return a RenderedContentInterface. To get the resulting HTML, either cast it to a string or call ->getContent(). (This new interface extends from Stringable so you can type hint against that instead, if needed.)

 use League\CommonMark\CommonMarkConverter;

 $converter = new CommonMarkConverter();
-echo $converter->convertToHtml('# Hello World!');
+echo $converter->convertToHtml('# Hello World!')->getContent();
+// or
+echo (string) $converter->convertToHtml('# Hello World!');

HTML Changes

Table of Contents items are no longer wrapped with <p> tags:

 <ul class="table-of-contents">
-        <p><a href="#level-2-heading">Level 2 Heading</a></p>
+        <a href="#level-2-heading">Level 2 Heading</a>
-        <p><a href="#level-4-heading">Level 4 Heading</a></p>
+        <a href="#level-4-heading">Level 4 Heading</a>
-        <p><a href="#level-3-heading">Level 3 Heading</a></p>
+        <a href="#level-3-heading">Level 3 Heading</a>

See #613 for details.

Additionally, the HTML (including URL fragments) for Heading Permalinks have changed:

-<h1><a id="user-content-hello-world" href="#hello-world" name="hello-world" class="heading-permalink" aria-hidden="true" title="Permalink">¶</a>Hello World!</h1>
+<h1><a id="content-hello-world" href="#content-hello-world" class="heading-permalink" aria-hidden="true" title="Permalink">¶</a>Hello World!</h1>

Note that the href now targets the id attribute instead of the name, which is deprecated in HTML 5. Additionally, the default prefix has changed to content. See the Heading Permalink extension documentation for more details on how to configure the prefixes.

Configuration Option Changes

Several configuration options now have new names:

Old Key/Path New Key/Path Notes
enable_em commonmark/enable_em  
enable_strong commonmark/enable_strong  
use_asterisk commonmark/use_asterisk  
use_underscore commonmark/use_underscore  
unordered_list_markers commonmark/unordered_list_markers Empty arrays no longer allowed
heading_permalink/id_prefix (unchanged) Default is now content
heading_permalink/inner_contents heading_permalink/symbol  
heading_permalink/slug_normalizer slug_normalizer/instance  
max_nesting_level (unchanged) Only integer values are supported
mentions/*/symbol mentions/*/prefix  
mentions/*/regex mentions/*/pattern Cannot contain start/end / delimiters

Classes/Namespaces Renamed

Many classes now live in different namespaces, and some have also been renamed. Here’s a quick guide showing their new locations:

(Note that the base namespace of League\CommonMark has been omitted from this table for brevity.)

Old Class Namespace/Name (1.x) New Class Namespace/Name (2.0)
Environment Environment\Environment
Extension\CommonMarkCoreExtension Extension\CommonMark\CommonMarkCoreExtension
Block\Element\Document Node\Block\Document
DocParser Parser\MarkdownParser
DocParserInterface Parser\MarkdownParserInterface
ElementRendererInterface Renderer\ChildNodeRendererInterface
HtmlRenderer Renderer\HtmlRenderer

(This is only a partial list of the clases and interfaces you’re likely to work with as a consumer – see the developer upgrade guide for the complete list.)

Removed Classes

The following classes have been removed:

Class name in 1.x Replacement / Notes
Converter Use MarkdownConverter instead.
ConverterInterface Use MarkdownConverterInterface. This interface has the same methods so it should be a drop-in replacement.

(Several other classes were removed, but these are the only ones you’re likely to notice. See the developer upgrade guide for the complete list.)

Renamed constants

The following constants have been moved/renamed:

Old Name/Location (1.x) New Name/Location (2.0)
EnvironmentInterface::HTML_INPUT_ALLOW HtmlFilter::ALLOW
EnvironmentInterface::HTML_INPUT_ESCAPE HtmlFilter::ESCAPE
EnvironmentInterface::HTML_INPUT_STRIP HtmlFilter::STRIP

Renamed Methods

The following methods have been renamed:

Class Old Name (1.x) New Name (2.0)
Environment / ConfigurableEnvironmentInterface addBlockParser() addBlockStartParser()
ReferenceMap / ReferenceMapInterface addReference() add()
ReferenceMap / ReferenceMapInterface getReference() get()
ReferenceMap / ReferenceMapInterface listReferences() getIterator()

Configuration Method Changes

Calling EnvironmentInterface::getConfig() without any parameters is no longer supported.

Calling ConfigurableEnvironmentInterface::mergeConfig() without any parameters is no longer supported.

The ConfigurableEnvironmentInterface::setConfig() method has been removed. Use getConfig() instead.

bin/commonmark command

This command was buggy to test and was relatively unpopular, so it has been removed. If you need this type of functionality, consider writing your own script with a Converter/Environment configured exactly how you want it.

CommonMarkConverter::VERSION constant

This previously-deprecated constant was removed in 2.0. Use \Composer\InstalledVersions provided by composer-runtime-api instead.

HeadingPermalinkRenderer::DEFAULT_INNER_CONTENTS constant

This previously-deprecated constant was removed in 2.0. Use HeadingPermalinkRenderer::DEFAULT_SYMBOL instead.

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