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<?php
/*
* This file is part of the league/commonmark package.
*
* (c) Colin O'Dell <colinodell@gmail.com>
*
* Original code based on the CommonMark JS reference parser (https://bitly.com/commonmark-js)
* - (c) John MacFarlane
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace League\CommonMark\Block\Parser;
use League\CommonMark\Block\Element\ListBlock;
use League\CommonMark\Block\Element\ListData;
use League\CommonMark\Block\Element\ListItem;
use League\CommonMark\Block\Element\Paragraph;
use League\CommonMark\ContextInterface;
use League\CommonMark\Cursor;
use League\CommonMark\Util\ConfigurationAwareInterface;
use League\CommonMark\Util\ConfigurationInterface;
use League\CommonMark\Util\RegexHelper;
final class ListParser implements BlockParserInterface, ConfigurationAwareInterface
{
/** @var ConfigurationInterface|null */
private $config;
/** @var string|null */
private $listMarkerRegex;
public function setConfiguration(ConfigurationInterface $configuration)
{
$this->config = $configuration;
}
public function parse(ContextInterface $context, Cursor $cursor): bool
{
if ($cursor->isIndented() && !($context->getContainer() instanceof ListBlock)) {
return false;
}
$indent = $cursor->getIndent();
if ($indent >= 4) {
return false;
}
$tmpCursor = clone $cursor;
$tmpCursor->advanceToNextNonSpaceOrTab();
$rest = $tmpCursor->getRemainder();
if (\preg_match($this->listMarkerRegex ?? $this->generateListMarkerRegex(), $rest) === 1) {
$data = new ListData();
$data->markerOffset = $indent;
$data->type = ListBlock::TYPE_BULLET;
$data->delimiter = null;
$data->bulletChar = $rest[0];
$markerLength = 1;
} elseif (($matches = RegexHelper::matchAll('/^(\d{1,9})([.)])/', $rest)) && (!($context->getContainer() instanceof Paragraph) || $matches[1] === '1')) {
$data = new ListData();
$data->markerOffset = $indent;
$data->type = ListBlock::TYPE_ORDERED;
$data->start = (int) $matches[1];
$data->delimiter = $matches[2];
$data->bulletChar = null;
$markerLength = \strlen($matches[0]);
} else {
return false;
}
// Make sure we have spaces after
$nextChar = $tmpCursor->peek($markerLength);
if (!($nextChar === null || $nextChar === "\t" || $nextChar === ' ')) {
return false;
}
// If it interrupts paragraph, make sure first line isn't blank
$container = $context->getContainer();
if ($container instanceof Paragraph && !RegexHelper::matchAt(RegexHelper::REGEX_NON_SPACE, $rest, $markerLength)) {
return false;
}
// We've got a match! Advance offset and calculate padding
$cursor->advanceToNextNonSpaceOrTab(); // to start of marker
$cursor->advanceBy($markerLength, true); // to end of marker
$data->padding = $this->calculateListMarkerPadding($cursor, $markerLength);
// add the list if needed
if (!($container instanceof ListBlock) || !$data->equals($container->getListData())) {
$context->addBlock(new ListBlock($data));
}
// add the list item
$context->addBlock(new ListItem($data));
return true;
}
/**
* @param Cursor $cursor
* @param int $markerLength
*
* @return int
*/
private function calculateListMarkerPadding(Cursor $cursor, int $markerLength): int
{
$start = $cursor->saveState();
$spacesStartCol = $cursor->getColumn();
while ($cursor->getColumn() - $spacesStartCol < 5) {
if (!$cursor->advanceBySpaceOrTab()) {
break;
}
}
$blankItem = $cursor->peek() === null;
$spacesAfterMarker = $cursor->getColumn() - $spacesStartCol;
if ($spacesAfterMarker >= 5 || $spacesAfterMarker < 1 || $blankItem) {
$cursor->restoreState($start);
$cursor->advanceBySpaceOrTab();
return $markerLength + 1;
}
return $markerLength + $spacesAfterMarker;
}
private function generateListMarkerRegex(): string
{
// No configuration given - use the defaults
if ($this->config === null) {
return $this->listMarkerRegex = '/^[*+-]/';
}
$markers = $this->config->get('unordered_list_markers', ['*', '+', '-']);
if (!\is_array($markers)) {
throw new \RuntimeException('Invalid configuration option "unordered_list_markers": value must be an array of strings');
}
return $this->listMarkerRegex = '/^[' . \preg_quote(\implode('', $markers), '/') . ']/';
}
}
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