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<?php
/*
* 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\Block\Element\ListItem;
use League\CommonMark\Block\Element\Paragraph;
use League\CommonMark\Inline\Parser\InlineParserInterface;
use League\CommonMark\InlineParserContext;
final class TaskListItemMarkerParser implements InlineParserInterface
{
public function getCharacters(): array
{
return ['['];
}
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();
$m = $cursor->match('/\[[ xX]\]/');
if ($m === null) {
return false;
}
if ($cursor->getNextNonSpaceCharacter() === null) {
$cursor->restoreState($oldState);
return false;
}
$isChecked = $m !== '[ ]';
$container->appendChild(new TaskListItemMarker($isChecked));
return true;
}
}