From f2552dd9ab034af3903055c067e1939c5e53be5c Mon Sep 17 00:00:00 2001
From: Denis Ryabov <dryabov@yandex.ru>
Date: Mon, 10 May 2021 20:06:58 +0300
Subject: [PATCH] Add JEDCheckerHelper class with some common methods

---
 .../com_jedchecker/libraries/helper.php       | 197 ++++++++++++++++++
 1 file changed, 197 insertions(+)
 create mode 100644 administrator/components/com_jedchecker/libraries/helper.php

diff --git a/administrator/components/com_jedchecker/libraries/helper.php b/administrator/components/com_jedchecker/libraries/helper.php
new file mode 100644
index 0000000..6251e04
--- /dev/null
+++ b/administrator/components/com_jedchecker/libraries/helper.php
@@ -0,0 +1,197 @@
+<?php
+/**
+ * @package    Joomla.JEDChecker
+ *
+ * @copyright  Copyright (C) 2021 Open Source Matters, Inc. All rights reserved.
+ *
+ * @license    GNU General Public License version 2 or later; see LICENSE.txt
+ */
+
+defined('_JEXEC') or die('Restricted access');
+
+
+/**
+ * class JedcheckerHelper
+ *
+ * This is a helper class with a set of static methods used by other JEDChecker classes
+ *
+ * @since  3.0
+ */
+abstract class JEDCheckerHelper
+{
+	const CLEAN_HTML     = 1;
+	const CLEAN_COMMENTS = 2;
+	const CLEAN_STRINGS  = 4;
+
+	/**
+	 * Split text into lines
+	 *
+	 * @param   string $content Text to split
+	 *
+	 * @return  string[]
+	 * @since  3.0
+	 */
+	public static function splitLines($content)
+	{
+		// Split on one of EOL characters (except of EOL at the end of text)
+		return preg_split("/(?:\r\n|\n|\r)(?!$)/", $content);
+	}
+
+	/**
+	 * Get extension name (element)
+	 *
+	 * @param   SimpleXMLElement $xml XML Manifest
+	 *
+	 * @return  string
+	 * @since  3.0
+	 */
+	public static function getElementName($xml)
+	{
+		$type = (string) $xml['type'];
+
+		if (isset($xml->element))
+		{
+			$extension = (string) $xml->element;
+		}
+		else
+		{
+			$extension = (string) $xml->name;
+
+			if (isset($xml->files))
+			{
+				foreach ($xml->files->children() as $child)
+				{
+					if (isset($child[$type]))
+					{
+						$extension = (string) $child[$type];
+					}
+				}
+			}
+		}
+
+		$extension = strtolower(JFilterInput::getInstance()->clean($extension, 'cmd'));
+
+		if ($type === 'component' && strpos($extension, 'com_') !== 0)
+		{
+			$extension = 'com_' . $extension;
+		}
+
+		return $extension;
+	}
+
+	/**
+	 * Removes HTML, comments, and/or strings content keeping EOL characters to preserve line numbers
+	 *
+	 * @param   string $content PHP sources
+	 * @param   int    $options Bitwise set of options
+	 *
+	 * @return  string
+	 * @since  3.0
+	 */
+	public static function cleanPhpCode($content, $options = self::CLEAN_HTML | self::CLEAN_COMMENTS)
+	{
+		$isCleanHtml     = $options & self::CLEAN_HTML;
+		$isCleanComments = $options & self::CLEAN_COMMENTS;
+		$isCleanStrings  = $options & self::CLEAN_STRINGS;
+
+		if (!preg_match('/<\?php\s/i', $content, $match, PREG_OFFSET_CAPTURE))
+		{
+			// No PHP code found
+			return $isCleanHtml ? '' : $content;
+		}
+
+		$pos = $match[0][1];
+		$code = substr($content, 0, $pos);
+		$cleanContent = $isCleanHtml ? self::removeContent($code) : $code;
+
+		while (preg_match('/(?:[\'"]|\/\*|\/\/|\?>)/', $content, $match, PREG_OFFSET_CAPTURE, $pos))
+		{
+			$foundPos = $match[0][1];
+			$cleanContent .= substr($content, $pos, $foundPos - $pos);
+			$pos = $foundPos;
+
+			switch ($match[0][0])
+			{
+				case '"':
+				case "'":
+					$q = $match[0][0];
+
+					if (!preg_match("/$q(?>[^$q\\\\]+|\\\\.)*$q/As", $content, $match, 0, $pos))
+					{
+						return $cleanContent . ($isCleanStrings ? $q : substr($content, $pos));
+					}
+
+					$code = $match[0];
+					$cleanContent .= $isCleanStrings ? $q . self::removeContent($code) . $q : $code;
+					$pos += strlen($code);
+					break;
+
+				case '/*':
+					$cleanContent .= '/*';
+					$pos += 2;
+
+					$endPos = strpos($content, '*/', $pos);
+
+					if ($endPos === false)
+					{
+						return $isCleanComments ? $cleanContent : $cleanContent . substr($content, $pos);
+					}
+
+					$code = substr($content, $pos, $endPos - $pos);
+					$cleanContent .= $isCleanComments ? self::removeContent($code) : $code;
+					$cleanContent .= '*/';
+					$pos = $endPos + 2;
+
+					break;
+
+				case '//':
+					$commentLen = strcspn($content, "\r\n", $pos);
+
+					if (!$isCleanComments)
+					{
+						$cleanContent .= substr($content, $pos, $commentLen);
+					}
+
+					$pos += $commentLen;
+					break;
+
+				case '?>':
+					$cleanContent .= '?>';
+					$pos += 2;
+
+					if (!preg_match('/<\?php\s/i', $content, $match, PREG_OFFSET_CAPTURE, $pos))
+					{
+						// No PHP code found (up to the end of the file)
+						return $cleanContent . ($isCleanHtml ? '' : substr($content, $pos));
+					}
+
+					$foundPos = $match[0][1];
+					$code = substr($content, $pos, $foundPos - $pos);
+					$cleanContent .= $isCleanHtml ? self::removeContent($code) : $code;
+
+					$phpPreamble = $match[0][0];
+					$cleanContent .= $phpPreamble;
+					$pos = $foundPos + strlen($phpPreamble);
+
+					break;
+			}
+		}
+
+		$cleanContent .= substr($content, $pos);
+
+		return $cleanContent;
+	}
+
+	/**
+	 * Remove all text content by keeping newline characters only (to preserve line numbers)
+	 *
+	 * @param   string $content Partial content
+	 *
+	 * @return  string
+	 * @since  3.0
+	 */
+	protected static function removeContent($content)
+	{
+		return str_repeat("\n", substr_count($content, "\n"));
+	}
+}