' . self::e(implode("\n", $code)) . '';
$i++;
continue;
}
if (preg_match('/^(#{1,6})\s+(.+)$/', $line, $matches)) {
$level = strlen($matches[1]);
$html[] = '' . self::inline($matches[2]) . '';
$i++;
continue;
}
if (preg_match('/^(-{3,}|\*{3,}|_{3,})$/', trim($line))) {
$html[] = '
';
$i++;
continue;
}
if (preg_match('/^\s*>\s?(.*)$/', $line)) {
$quote = [];
while ($i < $count && preg_match('/^\s*>\s?(.*)$/', rtrim($lines[$i]), $matches)) {
$quote[] = $matches[1];
$i++;
}
$html[] = '' . self::toHtml(implode("\n", $quote)) . '
';
continue;
}
if (preg_match('/^\s*[-*+]\s+(.+)$/', $line)) {
$items = [];
while ($i < $count && preg_match('/^\s*[-*+]\s+(.+)$/', rtrim($lines[$i]), $matches)) {
$items[] = '' . self::inline($matches[1]) . '';
$i++;
}
$html[] = '' . implode('', $items) . '
';
continue;
}
if (preg_match('/^\s*\d+\.\s+(.+)$/', $line)) {
$items = [];
while ($i < $count && preg_match('/^\s*\d+\.\s+(.+)$/', rtrim($lines[$i]), $matches)) {
$items[] = '' . self::inline($matches[1]) . '';
$i++;
}
$html[] = '' . implode('', $items) . '
';
continue;
}
$paragraph = [$line];
$i++;
while ($i < $count && trim($lines[$i]) !== '' && !self::startsBlock(rtrim($lines[$i]))) {
$paragraph[] = trim($lines[$i]);
$i++;
}
$html[] = '' . self::inline(implode(' ', $paragraph)) . '
';
}
return implode("\n", $html);
}
public static function excerpt(string $markdown, int $words = 28): string
{
$text = trim(preg_replace('/\s+/', ' ', strip_tags(self::toHtml($markdown))) ?? '');
if ($text === '') {
return '';
}
$parts = preg_split('/\s+/', $text) ?: [];
if (count($parts) <= $words) {
return $text;
}
return implode(' ', array_slice($parts, 0, $words)) . '...';
}
private static function startsBlock(string $line): bool
{
return (bool) preg_match('/^(#{1,6}\s+|```|^\s*[-*+]\s+|^\s*\d+\.\s+|^\s*>\s?|(-{3,}|\*{3,}|_{3,})$)/', $line);
}
private static function inline(string $text): string
{
$placeholders = [];
$text = preg_replace_callback('/`([^`]+)`/', static function (array $matches) use (&$placeholders): string {
$key = "\x1A" . count($placeholders) . "\x1A";
$placeholders[$key] = '' . self::e($matches[1]) . '';
return $key;
}, $text) ?? $text;
$text = self::e($text);
$text = preg_replace_callback('/!\[([^\]]*)\]\(([^)\s]+)(?:\s+"([^"]+)")?\)/', static function (array $matches): string {
$title = isset($matches[3]) ? ' title="' . self::e($matches[3]) . '"' : '';
return '![' . self::e($matches[1]) . '](' . self::e($matches[2]) . ')
';
}, $text) ?? $text;
$text = preg_replace_callback('/\[([^\]]+)\]\(([^)\s]+)(?:\s+"([^"]+)")?\)/', static function (array $matches): string {
$title = isset($matches[3]) ? ' title="' . self::e($matches[3]) . '"' : '';
return '' . $matches[1] . '';
}, $text) ?? $text;
$text = preg_replace('/\*\*([^*]+)\*\*/', '$1', $text) ?? $text;
$text = preg_replace('/\*([^*]+)\*/', '$1', $text) ?? $text;
return strtr($text, $placeholders);
}
private static function e(string $value): string
{
return htmlspecialchars($value, ENT_QUOTES | ENT_SUBSTITUTE, 'UTF-8');
}
}