the latest code

vendor/league/commonmark/src/Extension/TaskList/TaskListExtension.php

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+<?php
+
+declare(strict_types=1);
+
+/*
+ * This file is part of the league/commonmark package.
+ *
+ * (c) Colin O'Dell <colinodell@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace League\CommonMark\Extension\TaskList;
+
+use League\CommonMark\Environment\EnvironmentBuilderInterface;
+use League\CommonMark\Extension\ExtensionInterface;
+
+final class TaskListExtension implements ExtensionInterface
+{
+    public function register(EnvironmentBuilderInterface $environment): void
+    {
+        $environment->addInlineParser(new TaskListItemMarkerParser(), 35);
+        $environment->addRenderer(TaskListItemMarker::class, new TaskListItemMarkerRenderer());
+    }
+}

vendor/league/commonmark/src/Extension/TaskList/TaskListItemMarker.php

@@ -0,0 +1,39 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * This file is part of the league/commonmark package.
+ *
+ * (c) Colin O'Dell <colinodell@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace League\CommonMark\Extension\TaskList;
+
+use League\CommonMark\Node\Inline\AbstractInline;
+
+final class TaskListItemMarker extends AbstractInline
+{
+    /** @psalm-readonly-allow-private-mutation */
+    private bool $checked;
+
+    public function __construct(bool $isCompleted)
+    {
+        parent::__construct();
+
+        $this->checked = $isCompleted;
+    }
+
+    public function isChecked(): bool
+    {
+        return $this->checked;
+    }
+
+    public function setChecked(bool $checked): void
+    {
+        $this->checked = $checked;
+    }
+}

vendor/league/commonmark/src/Extension/TaskList/TaskListItemMarkerParser.php

@@ -0,0 +1,55 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * This file is part of the league/commonmark package.
+ *
+ * (c) Colin O'Dell <colinodell@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace League\CommonMark\Extension\TaskList;
+
+use League\CommonMark\Extension\CommonMark\Node\Block\ListItem;
+use League\CommonMark\Node\Block\Paragraph;
+use League\CommonMark\Parser\Inline\InlineParserInterface;
+use League\CommonMark\Parser\Inline\InlineParserMatch;
+use League\CommonMark\Parser\InlineParserContext;
+
+final class TaskListItemMarkerParser implements InlineParserInterface
+{
+    public function getMatchDefinition(): InlineParserMatch
+    {
+        return InlineParserMatch::oneOf('[ ]', '[x]');
+    }
+
+    public function parse(InlineParserContext $inlineContext): bool
+    {
+        $container = $inlineContext->getContainer();
+
+        // Checkbox must come at the beginning of the first paragraph of the list item
+        if ($container->hasChildren() || ! ($container instanceof Paragraph && $container->parent() && $container->parent() instanceof ListItem)) {
+            return false;
+        }
+
+        $cursor   = $inlineContext->getCursor();
+        $oldState = $cursor->saveState();
+
+        $cursor->advanceBy(3);
+
+        if ($cursor->getNextNonSpaceCharacter() === null) {
+            $cursor->restoreState($oldState);
+
+            return false;
+        }
+
+        $isChecked = $inlineContext->getFullMatch() !== '[ ]';
+
+        $container->appendChild(new TaskListItemMarker($isChecked));
+
+        return true;
+    }
+}

vendor/league/commonmark/src/Extension/TaskList/TaskListItemMarkerRenderer.php

@@ -0,0 +1,70 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * This file is part of the league/commonmark package.
+ *
+ * (c) Colin O'Dell <colinodell@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace League\CommonMark\Extension\TaskList;
+
+use League\CommonMark\Node\Node;
+use League\CommonMark\Renderer\ChildNodeRendererInterface;
+use League\CommonMark\Renderer\NodeRendererInterface;
+use League\CommonMark\Util\HtmlElement;
+use League\CommonMark\Xml\XmlNodeRendererInterface;
+
+final class TaskListItemMarkerRenderer implements NodeRendererInterface, XmlNodeRendererInterface
+{
+    /**
+     * @param TaskListItemMarker $node
+     *
+     * {@inheritDoc}
+     *
+     * @psalm-suppress MoreSpecificImplementedParamType
+     */
+    public function render(Node $node, ChildNodeRendererInterface $childRenderer): \Stringable
+    {
+        TaskListItemMarker::assertInstanceOf($node);
+
+        $attrs    = $node->data->get('attributes');
+        $checkbox = new HtmlElement('input', $attrs, '', true);
+
+        if ($node->isChecked()) {
+            $checkbox->setAttribute('checked', '');
+        }
+
+        $checkbox->setAttribute('disabled', '');
+        $checkbox->setAttribute('type', 'checkbox');
+
+        return $checkbox;
+    }
+
+    public function getXmlTagName(Node $node): string
+    {
+        return 'task_list_item_marker';
+    }
+
+    /**
+     * @param TaskListItemMarker $node
+     *
+     * @return array<string, scalar>
+     *
+     * @psalm-suppress MoreSpecificImplementedParamType
+     */
+    public function getXmlAttributes(Node $node): array
+    {
+        TaskListItemMarker::assertInstanceOf($node);
+
+        if ($node->isChecked()) {
+            return ['checked' => 'checked'];
+        }
+
+        return [];
+    }
+}