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<?php
/**
* @copyright Copyright (c) 2014 Carsten Brandt
* @license https://github.com/cebe/markdown/blob/master/LICENSE
* @link https://github.com/cebe/markdown#readme
*/
namespace cebe\markdown\inline;
/**
* Adds inline emphasizes and strong elements
*/
trait EmphStrongTrait
{
/**
* Parses emphasized and strong elements.
* @marker _
* @marker *
*/
protected function parseEmphStrong($text)
{
$marker = $text[0];
if (!isset($text[1])) {
return [['text', $text[0]], 1];
}
if ($marker == $text[1]) { // strong
// work around a PHP bug that crashes with a segfault on too much regex backtrack
// check whether the end marker exists in the text
// https://github.com/erusev/parsedown/issues/443
// https://bugs.php.net/bug.php?id=45735
if (strpos($text, $marker . $marker, 2) === false) {
return [['text', $text[0] . $text[1]], 2];
}
if ($marker === '*' && preg_match('/^[*]{2}((?>\\\\[*]|[^*]|[*][^*]*[*])+?)[*]{2}/s', $text, $matches) ||
$marker === '_' && preg_match('/^__((?>\\\\_|[^_]|_[^_]*_)+?)__/us', $text, $matches)) {
return [
[
'strong',
$this->parseInline($matches[1]),
],
strlen($matches[0])
];
}
} else { // emph
// work around a PHP bug that crashes with a segfault on too much regex backtrack
// check whether the end marker exists in the text
// https://github.com/erusev/parsedown/issues/443
// https://bugs.php.net/bug.php?id=45735
if (strpos($text, $marker, 1) === false) {
return [['text', $text[0]], 1];
}
if ($marker === '*' && preg_match('/^[*]((?>\\\\[*]|[^*]|[*][*][^*]+?[*][*])+?)[*](?![*][^*])/s', $text, $matches) ||
$marker === '_' && preg_match('/^_((?>\\\\_|[^_]|__[^_]*__)+?)_(?!_[^_])\b/us', $text, $matches)) {
// if only a single whitespace or nothing is contained in an emphasis, do not consider it valid
if ($matches[1] === '' || $matches[1] === ' ') {
return [['text', $text[0]], 1];
}
return [
[
'emph',
$this->parseInline($matches[1]),
],
strlen($matches[0])
];
}
}
return [['text', $text[0]], 1];
}
protected function renderStrong($block)
{
return '<strong>' . $this->renderAbsy($block[1]) . '</strong>';
}
protected function renderEmph($block)
{
return '<em>' . $this->renderAbsy($block[1]) . '</em>';
}
abstract protected function parseInline($text);
abstract protected function renderAbsy($blocks);
}