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<?php
/**
 * VQMod
 * @description Main Object used
 */
abstract class VQMod {
	public static $_vqversion = '2.5.1';						// Current version number

private static $_modFileList = array();						// Array of xml files
	private static $_mods = array();							// Array of modifications to apply
	private static $_filesModded = array();						// Array of already modified files
	private static $_doNotMod = array();						// Array of files not to apply modifications to
	private static $_cwd = '';									// Current working directory path
	private static $_folderChecks = false;						// Flag for already checked log/cache folders exist
	private static $_cachePathFull = '';						// Full cache folder path
	private static $_lastModifiedTime = 0;						// Integer representing the last time anything was modified
	private static $_devMode = false;							// Flag for developer mode - disables caching while true

public static $logFolder = 'vqmod/logs/';					// Path log folders are stored in
	public static $vqCachePath = 'vqmod/vqcache/';				// Relative path to cache file directory
	public static $modCache = 'vqmod/mods.cache';				// Relative path to serialized mods array cache file
	public static $checkedCache = 'vqmod/checked.cache';		// Relative path to already checked files array cache file
	public static $protectedFilelist = 'vqmod/vqprotect.txt';	// Relative path to protected files array cache file
	public static $pathReplaces = 'vqmod/pathReplaces.php';		// Relative path to dynamic path replacement file
	public static $logging = true;								// Flag to enabled/disable logging
	public static $log;											// Log object reference
	public static $fileModding = false;							// Reference to the current file being modified by vQmod for logging
	public static $directorySeparator = '';						// System directory separator (/ or \ depending on OS)
	public static $replaces = array();							// Array of regex replaces to perform on file paths
	public static $windows = false;								// Flag determining if windows or *nix based

/**
	 * VQMod::bootup()
	 *
	 * @param bool $path File path to use
	 * @param bool $logging Enable/disabled logging
	 * @return null
	 * @description Startup of VQMod
	 */
	public static function bootup($path = false, $logging = true) {
		if(!class_exists('DOMDocument')) {
			die('VQMod::bootup - ERROR - YOU NEED THE PHP "DOMDocument" EXTENSION INSTALLED TO USE VQMod');
		}

if(strtoupper(substr(PHP_OS, 0, 3)) == 'WIN') {
			self::$windows = true;
		}

self::$directorySeparator = defined('DIRECTORY_SEPARATOR') ? DIRECTORY_SEPARATOR : '/';

if(!$path){
			$path = dirname(dirname(__FILE__));
		}
		self::_setCwd($path);

self::$logging = (bool) $logging;
		self::$log = new VQModLog();

$replacesPath = self::path(self::$pathReplaces);
		$replaces = array();
		if($replacesPath) {
			include_once($replacesPath);
			self::$_lastModifiedTime = filemtime($replacesPath);
		}

self::$replaces = !is_array($replaces) ? array() : $replaces;
		self::_getMods();
		self::_loadProtected();
		self::_loadChecked();
	}

/**
	 * VQMod::modCheck()
	 *
	 * @param string $sourceFile path for file to be modified
	 * @param string $modificationFile path for mods to be applied to file
	 * @return string
	 * @description Checks if a file has modifications and applies them, returning cache files or the file name
	 */
	public static function modCheck($sourceFile, $modificationFile = false) {

if(!self::$_folderChecks) {

if(self::$logging) {
				// Create log folder if it doesn't exist
				$log_folder = self::path(self::$logFolder, true);
				self::dirCheck($log_folder);
			}

// Create cache folder if it doesn't exist
			$cache_folder = self::path(self::$vqCachePath, true);
			self::dirCheck($cache_folder);

// Store cache folder path to save on repeat checks for path validity
			self::$_cachePathFull = self::path(self::$vqCachePath);

self::$_folderChecks = true;
		}

if(!preg_match('%^([a-z]:)?[\\\\/]%i', $sourceFile)) {
			$sourcePath = self::path($sourceFile);
		} else {
			$sourcePath = self::_realpath($sourceFile);
		}

if($modificationFile !== false) {
			if(!preg_match('%^([a-z]:)?[\\\\/]%i', $modificationFile)) {
				$modificationsPath = self::path($modificationFile);
			} else {
				$modificationsPath = self::_realpath($modificationFile);
			}
		} else {
			$modificationsPath = $sourcePath;
		}

if(!$sourcePath || is_dir($sourcePath) || in_array($sourcePath, self::$_doNotMod)) {
			return $sourceFile;
		}

$stripped_filename = preg_replace('~^' . preg_quote(self::getCwd(), '~i') . '~', '', $sourcePath);
		$cacheFile = self::_cacheName($stripped_filename);
		$file_last_modified = filemtime($sourcePath);

if(file_exists($cacheFile) && filemtime($cacheFile) >= self::$_lastModifiedTime && filemtime($cacheFile) >= $file_last_modified) {
			return $cacheFile;
		}

if(isset(self::$_filesModded[$sourcePath])) {
			return self::$_filesModded[$sourcePath]['cached'] ? $cacheFile : $sourceFile;
		}

$changed = false;
		$fileHash = sha1_file($sourcePath);
		$fileData = file_get_contents($sourcePath);

foreach(self::$_mods as $modObject) {
			foreach($modObject->mods as $path => $mods) {
				if(self::_checkMatch($path, $modificationsPath)) {
					$modObject->applyMod($mods, $fileData);
				}
			}
		}

if (sha1($fileData) != $fileHash) {
			$writePath = $cacheFile;
			if(!file_exists($writePath) || is_writable($writePath)) {
				file_put_contents($writePath, $fileData, LOCK_EX);
				$changed = true;
			}
		} else {
			file_put_contents(self::path(self::$checkedCache, true), $stripped_filename . PHP_EOL, FILE_APPEND | LOCK_EX);
			self::$_doNotMod[] = $sourcePath;
		}

self::$_filesModded[$sourcePath] = array('cached' => $changed);
		return $changed ? $writePath : $sourcePath;
	}

/**
	 * VQMod::path()
	 *
	 * @param string $path File path
	 * @param bool $skip_real If true path is full not relative
	 * @return bool, string
	 * @description Returns the full true path of a file if it exists, otherwise false
	 */
	public static function path($path, $skip_real = false) {
		$tmp = self::$_cwd . $path;
		$realpath = $skip_real ? $tmp : self::_realpath($tmp);
		if(!$realpath) {
			return false;
		}
		return $realpath;
	}

/**
	 * VQMod::getCwd()
	 *
	 * @return string
	 * @description Returns current working directory
	 */
	public static function getCwd() {
		return self::$_cwd;
	}

/**
	 * VQMod::dirCheck()
	 *
	 * @param string $path
	 * @return null
	 * @description Creates $path folder if it doesn't exist
	 */
	public static function dirCheck($path) {
		if(!is_dir($path)) {
			if(!mkdir($path)) {
				die('VQMod::dirCheck - CANNOT CREATE "' . $path . '" DIRECTORY');
			}
		}
	}

/**
	 * VQMod::handleXMLError()
	 *
	 * @description Error handler for bad XML files
	 */
	public static function handleXMLError($errno, $errstr, $errfile, $errline) {
		if ($errno == E_WARNING && (substr_count($errstr, 'DOMDocument::load()') > 0)) {
			throw new DOMException(str_replace('DOMDocument::load()', '', $errstr));
		} else {
			return false;
		}
	}

/**
	 * VQMod::_getMods()
	 *
	 * @return null
	 * @description Gets list of XML files in vqmod xml folder for processing
	 */
	private static function _getMods() {

self::$_modFileList = glob(self::path('vqmod/xml/', true) . '*.xml');

foreach(self::$_modFileList as $file) {
			if(file_exists($file)) {
				$lastMod = filemtime($file);
				if($lastMod > self::$_lastModifiedTime){
					self::$_lastModifiedTime = $lastMod;
				}
			}
		}

$xml_folder_time = filemtime(self::path('vqmod/xml'));
		if($xml_folder_time > self::$_lastModifiedTime){
			self::$_lastModifiedTime = $xml_folder_time;
		}

$modCache = self::path(self::$modCache);
		if(self::$_devMode || !file_exists($modCache)) {
			self::$_lastModifiedTime = time();
		} elseif(file_exists($modCache) && filemtime($modCache) >= self::$_lastModifiedTime) {
			$mods = file_get_contents($modCache);
			if(!empty($mods))
			self::$_mods = unserialize($mods);
			if(self::$_mods !== false) {
				return;
			}
		}

// Clear checked cache if rebuilding
		file_put_contents(self::path(self::$checkedCache, true), '', LOCK_EX);

if(self::$_modFileList) {
			self::_parseMods();
		} else {
			self::$log->write('VQMod::_getMods - NO XML FILES READABLE IN XML FOLDER');
		}
	}

/**
	 * VQMod::_parseMods()
	 *
	 * @return null
	 * @description Loops through xml files and attempts to load them as VQModObject's
	 */
	private static function _parseMods() {

set_error_handler(array('VQMod', 'handleXMLError'));

$dom = new DOMDocument('1.0', 'UTF-8');
		foreach(self::$_modFileList as $modFileKey => $modFile) {
			if(file_exists($modFile)) {
				try {
					$dom->load($modFile);
					$mod = $dom->getElementsByTagName('modification')->item(0);
					$vqmver = $mod->getElementsByTagName('vqmver')->item(0);

if($vqmver) {
						$version_check = $vqmver->getAttribute('required');
						if(strtolower($version_check) == 'true') {
							if(version_compare(self::$_vqversion, $vqmver->nodeValue, '<')) {
								self::$log->write('VQMod::_parseMods - FILE "' . $modFile . '" REQUIRES VQMOD "' . $vqmver->nodeValue . '" OR ABOVE AND HAS BEEN SKIPPED');
								continue;
							}
						}
					}

self::$_mods[] = new VQModObject($mod, $modFile);
				} catch (Exception $e) {
					self::$log->write('VQMod::_parseMods - INVALID XML FILE: ' . $e->getMessage());
				}
			} else {
				self::$log->write('VQMod::_parseMods - FILE NOT FOUND: ' . $modFile);
			}
		}

restore_error_handler();

$modCache = self::path(self::$modCache, true);
		$result = file_put_contents($modCache, serialize(self::$_mods), LOCK_EX);
		if(!$result) {
			die('VQMod::_parseMods - "/vqmod/mods.cache" FILE NOT WRITEABLE');
		}
	}

/**
	 * VQMod::_loadProtected()
	 *
	 * @return null
	 * @description Loads protected list and adds them to _doNotMod array
	 */
	private static function _loadProtected() {
		$file = self::path(self::$protectedFilelist);
		if($file && is_file($file)) {
			$paths = file($file, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
			if(!empty($paths)) {
				foreach($paths as $path) {
					$fullPath = self::path($path);
					if($fullPath && !in_array($fullPath, self::$_doNotMod)) {
						self::$_doNotMod[] = $fullPath;
					}
				}
			}
		}
	}

/**
	 * VQMod::_loadChecked()
	 *
	 * @return null
	 * @description Loads already checked files and adds them to _doNotMod array
	 */
	private static function _loadChecked() {
		$file = self::path(self::$checkedCache);
		if($file && is_file($file)) {
			$paths = file($file, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
			if(!empty($paths)) {
				foreach($paths as $path) {
					$fullPath = self::path($path, true);
					if($fullPath) {
						self::$_doNotMod[] = $fullPath;
					}
				}
			}
		}
	}

/**
	 * VQMod::_cacheName()
	 *
	 * @param string $file Filename to be converted to cache filename
	 * @return string
	 * @description Returns cache file name for a path
	 */
	private static function _cacheName($file) {
		return self::$_cachePathFull . 'vq2-' . preg_replace('~[/\\\\]+~', '_', $file);
	}

/**
	 * VQMod::_setCwd()
	 *
	 * @param string $path Path to be used as current working directory
	 * @return null
	 * @description Sets the current working directory variable
	 */
	private static function _setCwd($path) {
		self::$_cwd = self::_realpath($path);
	}

/**
	 * VQMod::_realpath()
	 *
	 * @param string $file
	 * @return string
	 * @description Returns real path of any path, adding directory slashes if necessary
	 */
	private static function _realpath($file) {
		$path = realpath($file);
		if(!$path) {
			return false;
		}

if(is_dir($path)) {
			$path = rtrim($path, self::$directorySeparator) . self::$directorySeparator;
		}

return $path;
	}

/**
	 * VQMod::_checkMatch()
	 *
	 * @param string $modFilePath Modification path from a <file> node
	 * @param string $checkFilePath File path
	 * @return bool
	 * @description Checks a modification path against a file path
	 */
	private static function _checkMatch($modFilePath, $checkFilePath) {
		$modFilePath = str_replace('\\', '/', $modFilePath);
		$checkFilePath = str_replace('\\', '/', $checkFilePath);

if(self::$windows) {
			$modFilePath = strtolower($modFilePath);
			$checkFilePath = strtolower($checkFilePath);
		}

if($modFilePath == $checkFilePath) {
			$return = true;
		} elseif(strpos($modFilePath, '*') !== false) {
			$return = true;
			$modParts = explode('/', $modFilePath);
			$checkParts = explode('/', $checkFilePath);
			
			if(count($modParts) !== count($checkParts)) {
				 $return = false;
			} else {

$toCheck = array_diff_assoc($modParts, $checkParts);
				
				foreach($toCheck as $k => $part) {
					if($part === '*') {
						continue;
					} elseif(strpos($part, '*') !== false) {
						$part = preg_replace_callback('~([^*]+)~', array('self', '_quotePath'), $part);
						$part = str_replace('*', '[^/]*', $part);
						$part = (bool) preg_match('~^' . $part . '$~', $checkParts[$k]);

if($part) {
							continue;
						}
					} elseif($part === $checkParts[$k]) {
						continue;
					}

$return = false;
					break;
				}

}
		} else {
			$return = false;
		}

return $return;
	}

/**
	 * VQMod::_quotePath()
	 *
	 * @param string $matches callback matches
	 * @return string
	 * @description apply's preg_quote to string from callback
	 */
	private static function _quotePath($matches) {
		return preg_quote($matches[1], '~');
	}
}

/**
 * VQModLog
 * @description Object to log information to a file
 */
class VQModLog {
	private $_sep;
	private $_defhash = 'da39a3ee5e6b4b0d3255bfef95601890afd80709';
	private $_logs = array();

/**
	 * VQModLog::__construct()
	 *
	 * @return null
	 * @description Object instantiation method
	 */
	public function __construct() {
		$this->_sep = str_repeat('-', 70);
	}

/**
	 * VQModLog::__destruct()
	 *
	 * @return null
	 * @description Logs any messages to the log file just before object is destroyed
	 */
	public function __destruct() {
		if(empty($this->_logs) || VQMod::$logging == false) {
			return;
		}

$logPath = VQMod::path(VQMod::$logFolder . date('w_D') . '.log', true);

$txt = array();

$txt[] = str_repeat('-', 10) . ' Date: ' . date('Y-m-d H:i:s') . ' ~ IP : ' . (isset($_SERVER['REMOTE_ADDR']) ? $_SERVER['REMOTE_ADDR'] : 'N/A') . ' ' . str_repeat('-', 10);
		$txt[] = 'REQUEST URI : ' . $_SERVER['REQUEST_URI'];

foreach($this->_logs as $count => $log) {
			if($log['obj']) {
				$vars = get_object_vars($log['obj']);
				$txt[] = 'MOD DETAILS:';
				foreach($vars as $k => $v) {
					if(is_string($v)) {
						$txt[] = '   ' . str_pad($k, 10, ' ', STR_PAD_RIGHT) . ': ' . $v;
					}
				}

}

foreach($log['log'] as $msg) {
				$txt[] = $msg;
			}

if ($count > count($this->_logs)-1) {
				$txt[] = '';
			}
		}

$txt[] = $this->_sep;
		$txt[] = str_repeat(PHP_EOL, 2);
		$append = true;

if(!file_exists($logPath)) {
			$append = false;
		} else {
			$content = file_get_contents($logPath);
			if(!empty($content) && strpos($content, ' Date: ' . date('Y-m-d ')) === false) {
				$append = false;
			}
		}

$result = file_put_contents($logPath, implode(PHP_EOL, $txt), ($append ? FILE_APPEND | LOCK_EX : LOCK_EX));
		if(!$result) {
			die('VQModLog::__destruct - LOG FILE "' . $logPath . '" COULD NOT BE WRITTEN');
		}
	}

/**
	 * VQModLog::write()
	 *
	 * @param string $data Text to be added to log file
	 * @param VQModObject $obj Modification the error belongs to
	 * @return null
	 * @description Adds error to log object ready to be output
	 */
	public function write($data, VQModObject $obj = NULL) {
		if($obj) {
			$hash = sha1($obj->id);
		} else {
			$hash = $this->_defhash;
		}

if(empty($this->_logs[$hash])) {
			$this->_logs[$hash] = array(
				'obj' => $obj,
				'log' => array()
			);
		}

if(VQMod::$fileModding) {
			$this->_logs[$hash]['log'][] = PHP_EOL . 'File Name    : ' . VQMod::$fileModding;
		}

$this->_logs[$hash]['log'][] = $data;

}
}

/**
 * VQModObject
 * @description Object for the <modification> that orchestrates each applied modification
 */
class VQModObject {
	public $modFile = '';
	public $id = '';
	public $version = '';
	public $vqmver = '';
	public $author = '';
	public $mods = array();

private $_skip = false;

/**
	 * VQModObject::__construct()
	 *
	 * @param DOMNode $node <modification> node
	 * @param string $modFile File modification is from
	 * @return null
	 * @description Loads modification meta information
	 */
	public function __construct(DOMNode $node, $modFile) {
		if($node->hasChildNodes()) {
			foreach($node->childNodes as $child) {
				$name = (string) $child->nodeName;
				if(isset($this->$name)) {
					$this->$name = (string) $child->nodeValue;
				}
			}
		}

$this->modFile = $modFile;
		$this->_parseMods($node);
	}

/**
	 * VQModObject::skip()
	 *
	 * @return bool
	 * @description Returns the skip status of a modification
	 */
	public function skip() {
		return $this->_skip;
	}

/**
	 * VQModObject::applyMod()
	 *
	 * @param array $mods Array of search add nodes
	 * @param string $data File contents to be altered
	 * @return null
	 * @description Applies all modifications to the text data
	 */
	public function applyMod($mods, &$data) {
		if($this->_skip) return;
		$tmp = $data;

foreach($mods as $mod) {
			VQMod::$fileModding = $mod['fileToMod'] . '(' . $mod['opIndex'] . ')';
			if(!empty($mod['ignoreif'])) {
				if($mod['ignoreif']->regex == 'true') {
					if (preg_match($mod['ignoreif']->getContent(), $tmp)) {
						continue;
					}
				} else {
					if (strpos($tmp, $mod['ignoreif']->getContent()) !== false) {
						continue;
					}
				}
			}

$indexCount = 0;

$tmp = $this->_explodeData($tmp);
			$lineMax = count($tmp) - 1;

switch($mod['search']->position) {
				case 'top':
				$tmp[$mod['search']->offset] =  $mod['add']->getContent() . $tmp[$mod['search']->offset];
				break;

case 'bottom':
				$offset = $lineMax - $mod['search']->offset;
				if($offset < 0){
					$tmp[-1] = $mod['add']->getContent();
				} else {
					$tmp[$offset] .= $mod['add']->getContent();
				}
				break;

default:

$changed = false;
				foreach($tmp as $lineNum => $line) {
					if(strlen($mod['search']->getContent()) == 0) {
						if($mod['error'] == 'log' || $mod['error'] == 'abort') {
							VQMod::$log->write('VQModObject::applyMod - EMPTY SEARCH CONTENT ERROR', $this);
						}
						break;
					}

if($mod['search']->regex == 'true') {
						$pos = @preg_match($mod['search']->getContent(), $line);
						if($pos === false) {
							if($mod['error'] == 'log' || $mod['error'] == 'abort' ) {
								VQMod::$log->write('VQModObject::applyMod - INVALID REGEX ERROR - ' . $mod['search']->getContent(), $this);
							}
							continue 2;
						} elseif($pos == 0) {
							$pos = false;
						}
					} else {
						$pos = strpos($line, $mod['search']->getContent());
					}

if($pos !== false) {
						$indexCount++;
						$changed = true;

if(!$mod['search']->indexes() || ($mod['search']->indexes() && in_array($indexCount, $mod['search']->indexes()))) {

switch($mod['search']->position) {
								case 'before':
								$offset = ($lineNum - $mod['search']->offset < 0) ? -1 : $lineNum - $mod['search']->offset;
								$tmp[$offset] = empty($tmp[$offset]) ? $mod['add']->getContent() : $mod['add']->getContent() . "\n" . $tmp[$offset];
								break;

case 'after':
								$offset = ($lineNum + $mod['search']->offset > $lineMax) ? $lineMax : $lineNum + $mod['search']->offset;
								$tmp[$offset] = $tmp[$offset] . "\n" . $mod['add']->getContent();
								break;

case 'ibefore':
								$tmp[$lineNum] = str_replace($mod['search']->getContent(), $mod['add']->getContent() . $mod['search']->getContent(), $line);
								break;

case 'iafter':
								$tmp[$lineNum] = str_replace($mod['search']->getContent(), $mod['search']->getContent() . $mod['add']->getContent(), $line);
								break;

default:
								if(!empty($mod['search']->offset)) {
									if($mod['search']->offset > 0) {
										for($i = 1; $i <= $mod['search']->offset; $i++) {
											if(isset($tmp[$lineNum + $i])) {
												$tmp[$lineNum + $i] = '';
											}
										}
									} elseif($mod['search']->offset < 0) {
										for($i = -1; $i >= $mod['search']->offset; $i--) {
											if(isset($tmp[$lineNum + $i])) {
												$tmp[$lineNum + $i] = '';
											}
										}
									}
								}

if($mod['search']->regex == 'true') {
									$tmp[$lineNum] = preg_replace($mod['search']->getContent(), $mod['add']->getContent(), $line);
								} else {
									$tmp[$lineNum] = str_replace($mod['search']->getContent(), $mod['add']->getContent(), $line);
								}
								break;
							}
						}
					}
				}

if(!$changed) {
					$skip = ($mod['error'] == 'skip' || $mod['error'] == 'log') ? ' (SKIPPED)' : ' (ABORTING MOD)';

if($mod['error'] == 'log' || $mod['error'] == 'abort') {
						VQMod::$log->write('VQModObject::applyMod - SEARCH NOT FOUND' . $skip . ': ' . $mod['search']->getContent(), $this);
					}

if($mod['error'] == 'abort') {
						$this->_skip = true;
						return;
					}

}

break;
			}
			ksort($tmp);
			$tmp = $this->_implodeData($tmp);
		}

VQMod::$fileModding = false;

$data = $tmp;
	}

/**
	 * VQModObject::_parseMods()
	 *
	 * @param DOMNode $node <modification> node to be parsed
	 * @return null
	 * @description Parses modifications in preparation for the applyMod method to work
	 */
	private function _parseMods(DOMNode $node){
		$files = $node->getElementsByTagName('file');

$replaces = VQMod::$replaces;

foreach($files as $file) {
			$path = $file->getAttribute('path') ? $file->getAttribute('path') : '';
			$filesToMod = explode(',', $file->getAttribute('name'));

foreach($filesToMod as $filename) {

$fileToMod = $path . $filename;
				if(!empty($replaces)) {
					foreach($replaces as $r) {
						if(count($r) == 2) {
							$fileToMod = preg_replace($r[0], $r[1], $fileToMod);
						}
					}
				}

$error = ($file->hasAttribute('error')) ? $file->getAttribute('error') : 'log';
				$fullPath = VQMod::path($fileToMod);

if(!$fullPath || !file_exists($fullPath)){
					if(strpos($fileToMod, '*') !== false) {
						$fullPath = VQMod::getCwd() . $fileToMod;
					} else {
						if ($error == 'log' || $error == 'abort') {
							$skip = ($error == 'log') ? ' (SKIPPED)' : ' (ABORTING MOD)';
							VQMod::$log->write('VQModObject::parseMods - Could not resolve path for [' . $fileToMod . ']' . $skip, $this);
						}

if ($error == 'log' || $error == 'skip') {
							continue;
						} elseif ($error == 'abort') {
							return false;
						}
					}
				}

$operations = $file->getElementsByTagName('operation');

foreach($operations as $opIndex => $operation) {
					VQMod::$fileModding = $fileToMod . '(' . $opIndex . ')';
					$skipOperation = false;

$error = ($operation->hasAttribute('error')) ? $operation->getAttribute('error') : 'abort';
					$ignoreif = $operation->getElementsByTagName('ignoreif')->item(0);

if($ignoreif) {
						$ignoreif = new VQSearchNode($ignoreif);
					} else {
						$ignoreif = false;
					}

$search = $operation->getElementsByTagName('search')->item(0);
					$add = $operation->getElementsByTagName('add')->item(0);

if(!$search) {
						VQMod::$log->write('Operation <search> tag missing', $this);
						$skipOperation = true;
					}

if(!$add) {
						VQMod::$log->write('Operation <add> tag missing', $this);
						$skipOperation = true;
					}

if(!$skipOperation) {
						$this->mods[$fullPath][] = array(
							'search' 		=> new VQSearchNode($search),
							'add' 			=> new VQAddNode($add),
							'ignoreif'		=> $ignoreif,
							'error'		 	=> $error,
							'fileToMod'		=> $fileToMod,
							'opIndex'		=> $opIndex,
						);
					}
				}
				VQMod::$fileModding = false;
			}
		}
	}

/**
	 * VQModObject::_explodeData()
	 *
	 * @param string $data File contents
	 * @return string
	 * @description Splits a file into an array of individual lines
	 */
	private function _explodeData($data) {
		return explode("\n", $data);
	}

/**
	 * VQModObject::_implodeData()
	 *
	 * @param array $data Array of lines
	 * @return string
	 * @description Joins an array of lines back into a text file
	 */
	private function _implodeData($data) {
		return implode("\n", $data);
	}
}

/**
 * VQNode
 * @description Basic node object blueprint
 */
class VQNode {
	public $trim = 'false';

private $_content = '';

/**
	 * VQNode::__construct()
	 *
	 * @param DOMNode $node Search/add node
	 * @return null
	 * @description Parses the node attributes and sets the node property
	 */
	public function  __construct(DOMNode $node) {
		$this->_content = $node->nodeValue;

if($node->hasAttributes()) {
			foreach($node->attributes as $attr) {
				$name = $attr->nodeName;
				if(isset($this->$name)) {
					$this->$name = $attr->nodeValue;
				}
			}
		}
	}

/**
	 * VQNode::getContent()
	 *
	 * @return string
	 * @description Returns the content, trimmed if applicable
	 */
	public function getContent() {
		$content = ($this->trim == 'true') ? trim($this->_content) : $this->_content;
		return $content;
	}
}

/**
 * VQSearchNode
 * @description Object for the <search> xml tags
 */
class VQSearchNode extends VQNode {
	public $position = 'replace';
	public $offset = 0;
	public $index = 'false';
	public $regex = 'false';
	public $trim = 'true';

/**
	 * VQSearchNode::indexes()
	 *
	 * @return bool, array
	 * @description Returns the index values to use the search on, or false if none
	 */
	public function indexes() {
		if($this->index == 'false') {
			return false;
		}
		$tmp = explode(',', $this->index);
		foreach($tmp as $k => $v) {
			if(!is_int($v)) {
				unset($k);
			}
		}
		$tmp = array_unique($tmp);
		return empty($tmp) ? false : $tmp;
	}
}

/**
 * VQAddNode
 * @description Object for the <add> xml tags
 */
class VQAddNode extends VQNode {
}

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