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vendor/cebe/markdown/inline/EmphStrongTrait.php

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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 empathized 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}(?![*]{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)) {
+				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>';
+	}
+}