File lass/smarty/internals/core.read_cache

  1: <?php
  2: /**
  3:  * Smarty plugin
  4:  * @package Smarty
  5:  * @subpackage plugins
  6:  */
  7: 
  8: /**
  9:  * read a cache file, determine if it needs to be
 10:  * regenerated or not
 11:  *
 12:  * @param string $tpl_file
 13:  * @param string $cache_id
 14:  * @param string $compile_id
 15:  * @param string $results
 16:  * @return boolean
 17:  */
 18: 
 19: //  $tpl_file, $cache_id, $compile_id, &$results
 20: 
 21: function smarty_core_read_cache_file(&$params, &$smarty)
 22: {
 23:     static  $content_cache = array();
 24: 
 25:     if ($smarty->force_compile) {
 26:         // force compile enabled, always regenerate
 27:         return false;
 28:     }
 29: 
 30:     if (isset($content_cache[$params['tpl_file'].','.$params['cache_id'].','.$params['compile_id']])) {
 31:         list($params['results'], $smarty->_cache_info) = $content_cache[$params['tpl_file'].','.$params['cache_id'].','.$params['compile_id']];
 32:         return true;
 33:     }
 34: 
 35:     if (!empty($smarty->cache_handler_func)) {
 36:         // use cache_handler function
 37:         call_user_func_array($smarty->cache_handler_func,
 38:                              array('read', &$smarty, &$params['results'], $params['tpl_file'], $params['cache_id'], $params['compile_id'], null));
 39:     } else {
 40:         // use local cache file
 41:         $_auto_id = $smarty->_get_auto_id($params['cache_id'], $params['compile_id']);
 42:         $_cache_file = $smarty->_get_auto_filename($smarty->cache_dir, $params['tpl_file'], $_auto_id);
 43:         $params['results'] = $smarty->_read_file($_cache_file);
 44:     }
 45: 
 46:     if (empty($params['results'])) {
 47:         // nothing to parse (error?), regenerate cache
 48:         return false;
 49:     }
 50: 
 51:     $_contents = $params['results'];
 52:     $_info_start = strpos($_contents, "\n") + 1;
 53:     $_info_len = (int)substr($_contents, 0, $_info_start - 1);
 54:     $_cache_info = unserialize(substr($_contents, $_info_start, $_info_len));
 55:     $params['results'] = substr($_contents, $_info_start + $_info_len);
 56: 
 57:     if ($smarty->caching == 2 && isset ($_cache_info['expires'])){
 58:         // caching by expiration time
 59:         if ($_cache_info['expires'] > -1 && (time() > $_cache_info['expires'])) {
 60:             // cache expired, regenerate
 61:             return false;
 62:         }
 63:     } else {
 64:         // caching by lifetime
 65:         if ($smarty->cache_lifetime > -1 && (time() - $_cache_info['timestamp'] > $smarty->cache_lifetime)) {
 66:             // cache expired, regenerate
 67:             return false;
 68:         }
 69:     }
 70: 
 71:     if ($smarty->compile_check) {
 72:         $_params = array('get_source' => false, 'quiet'=>true);
 73:         foreach (array_keys($_cache_info['template']) as $_template_dep) {
 74:             $_params['resource_name'] = $_template_dep;
 75:             if (!$smarty->_fetch_resource_info($_params) || $_cache_info['timestamp'] < $_params['resource_timestamp']) {
 76:                 // template file has changed, regenerate cache
 77:                 return false;
 78:             }
 79:         }
 80: 
 81:         if (isset($_cache_info['config'])) {
 82:             $_params = array('resource_base_path' => $smarty->config_dir, 'get_source' => false, 'quiet'=>true);
 83:             foreach (array_keys($_cache_info['config']) as $_config_dep) {
 84:                 $_params['resource_name'] = $_config_dep;
 85:                 if (!$smarty->_fetch_resource_info($_params) || $_cache_info['timestamp'] < $_params['resource_timestamp']) {
 86:                     // config file has changed, regenerate cache
 87:                     return false;
 88:                 }
 89:             }
 90:         }
 91:     }
 92: 
 93:     $content_cache[$params['tpl_file'].','.$params['cache_id'].','.$params['compile_id']] = array($params['results'], $_cache_info);
 94: 
 95:     $smarty->_cache_info = $_cache_info;
 96:     return true;
 97: }
 98: 
 99: /* vim: set expandtab: */
100: 
101: ?>
102:
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