fixed nocache-handling with nested includes. there was a logical error

in the replacement of internal nocache-tags to dynamic content that
lead to false results with deeply nested includes or with
nocache-blocks inside nocache-blocks.

many thanks to Lars Jankowfsky for providing big help on reproducing
and tracking down this bug!

NEWS

@@ -1,3 +1,4 @@
+  - fixed nocache-handling with nested includes (Lars Jankowfsky, messju)
   - moved /libs/core to /libs/internals (boots)
   - fixed more parsing problems (messju)
 

libs/internals/core.write_cache_file.php

@@ -31,12 +31,34 @@ function smarty_core_write_cache_file($params, &$smarty)
         $smarty->_cache_info['expires'] = -1;
     }
 
-    // collapse {nocache...}-tags
-    $params['results'] = preg_replace('!((\{nocache\:([0-9a-f]{32})#(\d+)\})'
-                                      .'.*'
-                                      .'{/nocache\:\\3#\\4\})!Us'
-                                      ,'\\2'
-                                      ,$params['results']);
+    // collapse nocache.../nocache-tags
+    if (preg_match_all('!\{(/?)nocache\:[0-9a-f]{32}#\d+\}!', $params['results'], $match, PREG_PATTERN_ORDER)) {
+        // remove everything between every pair of outermost noache.../nocache-tags
+        // and replace it by a single nocache-tag
+        // this new nocache-tag will be replaced by dynamic contents in
+        // smarty_core_process_compiled_includes() on a cache-read
+        
+        $match_count = count($match[0]);
+        $results = preg_split('!(\{/?nocache\:[0-9a-f]{32}#\d+\})!', $params['results'], -1, PREG_SPLIT_DELIM_CAPTURE);
+        
+        $level = 0;
+        $j = 0;
+        for ($i=0, $results_count = count($results); $i < $results_count && $j < $match_count; $i++) {
+            if ($results[$i] == $match[0][$j]) {
+                // nocache tag
+                if ($match[1][$j]) { // closing tag
+                    $level--;
+                    unset($results[$i]);
+                } else { // opening tag
+                    if ($level++ > 0) unset($results[$i]);
+                }
+                $j++;
+            } elseif ($level > 0) {
+                unset($results[$i]);
+            }
+        }
+        $params['results'] = implode('', $results);
+    }
     $smarty->_cache_info['cache_serials'] = $smarty->_cache_serials;
 
     // prepend the cache header info into cache file