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<?php
/**
* CacheHelper helps create full page view caching.
*
* PHP versions 4 and 5
*
* CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
* Copyright 2005-2009, Cake Software Foundation, Inc. (http://cakefoundation.org)
*
* Licensed under The MIT License
* Redistributions of files must retain the above copyright notice.
*
* @copyright Copyright 2005-2009, Cake Software Foundation, Inc. (http://cakefoundation.org)
* @link http://cakephp.org CakePHP(tm) Project
* @package cake
* @subpackage cake.cake.libs.view.helpers
* @since CakePHP(tm) v 1.0.0.2277
* @license MIT License (http://www.opensource.org/licenses/mit-license.php)
*/

/**
* CacheHelper helps create full page view caching.
*
* When using CacheHelper you don't call any of its methods, they are all automatically
* called by View, and use the $cacheAction settings set in the controller.
*
* @package cake
* @subpackage cake.cake.libs.view.helpers
*/
class CacheHelper extends AppHelper {

/**
* Array of strings replaced in cached views.
* The strings are found between <cake:nocache><cake:nocache> in views
*
* @var array
* @access private
*/
var $__replace = array();

/**
* Array of string that are replace with there var replace above.
* The strings are any content inside <cake:nocache><cake:nocache> and includes the tags in views
*
* @var array
* @access private
*/
var $__match = array();

/**
* cache action time
*
* @var object
* @access public
*/
var $cacheAction;

/**
* Main method used to cache a view
*
* @param string $file File to cache
* @param string $out output to cache
* @param boolean $cache
* @return view ouput
*/
function cache($file, $out, $cache = false) {
$cacheTime = 0;
$useCallbacks = false;
if (is_array($this->cacheAction)) {
$keys = array_keys($this->cacheAction);
$index = null;

foreach ($keys as $action) {
if ($action == $this->params['action']) {
$index = $action;
break;
}
}

if (!isset($index) && $this->action == 'index') {
$index = 'index';
}

$options = $this->cacheAction;
if (isset($this->cacheAction[$index])) {
if (is_array($this->cacheAction[$index])) {
$options = array_merge(array('duration' => 0, 'callbacks' => false), $this->cacheAction[$index]);
} else {
$cacheTime = $this->cacheAction[$index];
}
}
if (isset($options['duration'])) {
$cacheTime = $options['duration'];
}
if (isset($options['callbacks'])) {
$useCallbacks = $options['callbacks'];
}
} else {
$cacheTime = $this->cacheAction;
}

if ($cacheTime != '' && $cacheTime > 0) {
$this->__parseFile($file, $out);
if ($cache === true) {
$cached = $this->__parseOutput($out);
$this->__writeFile($cached, $cacheTime, $useCallbacks);
}
return $out;
} else {
return $out;
}
}

/**
* Parse file searching for no cache tags
*
* @param string $file
* @param boolean $cache
* @access private
*/
function __parseFile($file, $cache) {
if (is_file($file)) {
$file = file_get_contents($file);
} elseif ($file = fileExistsInPath($file)) {
$file = file_get_contents($file);
}
preg_match_all('/(<cake:nocache>(?<=<cake:nocache>)[\\s\\S]*?(?=<\/cake:nocache>)<\/cake:nocache>)/i', $cache, $outputResult, PREG_PATTERN_ORDER);
preg_match_all('/(?<=<cake:nocache>)([\\s\\S]*?)(?=<\/cake:nocache>)/i', $file, $fileResult, PREG_PATTERN_ORDER);
$fileResult = $fileResult[0];
$outputResult = $outputResult[0];

if (!empty($this->__replace)) {
foreach ($outputResult as $i => $element) {
$index = array_search($element, $this->__match);
if ($index !== false) {
unset($outputResult[$i]);
}
}
$outputResult = array_values($outputResult);
}

if (!empty($fileResult)) {
$i = 0;
foreach ($fileResult as $cacheBlock) {
if (isset($outputResult[$i])) {
$this->__replace[] = $cacheBlock;
$this->__match[] = $outputResult[$i];
}
$i++;
}
}
}

/**
* Parse the output and replace cache tags
*
* @param sting $cache
* @return string with all replacements made to <cake:nocache><cake:nocache>
* @access private
*/
function __parseOutput($cache) {
$count = 0;
if (!empty($this->__match)) {
foreach ($this->__match as $found) {
$original = $cache;
$length = strlen($found);
$position = 0;

for ($i = 1; $i <= 1; $i++) {
$position = strpos($cache, $found, $position);

if ($position !== false) {
$cache = substr($original, 0, $position);
$cache .= $this->__replace[$count];
$cache .= substr($original, $position + $length);
} else {
break;
}
}
$count++;
}
return $cache;
}
return $cache;
}

/**
* Write a cached version of the file
*
* @param string $file
* @param sting $timestamp
* @return cached view
* @access private
*/
function __writeFile($content, $timestamp, $useCallbacks = false) {
$now = time();

if (is_numeric($timestamp)) {
$cacheTime = $now + $timestamp;
} else {
$cacheTime = strtotime($timestamp, $now);
}
$path = $this->here;
if ($this->here == '/') {
$path = 'home';
}
$cache = strtolower(Inflector::slug($path));

if (empty($cache)) {
return;
}
$cache = $cache . '.php';
$file = '<!--cachetime:' . $cacheTime . '--><?php';

if (empty($this->plugin)) {
$file .= '
App::import(\'Controller\', \'' . $this->controllerName. '\');
';
} else {
$file .= '
App::import(\'Controller\', \'' . $this->plugin . '.' . $this->controllerName. '\');
';
}

$file .= '$controller =& new ' . $this->controllerName . 'Controller();
$controller->plugin = $this->plugin = \''.$this->plugin.'\';
$controller->helpers = $this->helpers = unserialize(\'' . serialize($this->helpers) . '\');
$controller->base = $this->base = \'' . $this->base . '\';
$controller->layout = $this->layout = \'' . $this->layout. '\';
$controller->webroot = $this->webroot = \'' . $this->webroot . '\';
$controller->here = $this->here = \'' . $this->here . '\';
$controller->params = $this->params = unserialize(stripslashes(\'' . addslashes(serialize($this->params)) . '\'));
$controller->action = $this->action = unserialize(\'' . serialize($this->action) . '\');
$controller->data = $this->data = unserialize(stripslashes(\'' . addslashes(serialize($this->data)) . '\'));
$controller->theme = $this->theme = \'' . $this->theme . '\';
Router::setRequestInfo(array($this->params, array(\'base\' => $this->base, \'webroot\' => $this->webroot)));';

if ($useCallbacks == true) {
$file .= '
$controller->constructClasses();
$controller->Component->initialize($controller);
$controller->beforeFilter();
$controller->Component->startup($controller);';
}

$file .= '
$loadedHelpers = array();
$loadedHelpers = $this->_loadHelpers($loadedHelpers, $this->helpers);
foreach (array_keys($loadedHelpers) as $helper) {
$camelBackedHelper = Inflector::variable($helper);
${$camelBackedHelper} =& $loadedHelpers[$helper];
$this->loaded[$camelBackedHelper] =& ${$camelBackedHelper};
$this->{$helper} =& $loadedHelpers[$helper];
}
?>';
$content = preg_replace("/(<\\?xml)/", "<?php echo '$1';?>",$content);
$file .= $content;
return cache('views' . DS . $cache, $file, $timestamp);
}
}
?>
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