Add balanced token checking

git-svn-id: https://svn.php.net/repository/pear/packages/Text_Wiki/trunk@222441 c90b9560-bf6c-de11-be94-00142212c4b1

Text/Wiki.php

@@ -1029,6 +1029,7 @@ function render($format = 'Xhtml')
         } else {
             // pass through the parsed source text character by character
             $this->_block = '';
+            $tokenStack = array();
             $k = strlen($this->source);
             for ($i = 0; $i < $k; $i++) {
 
@@ -1046,6 +1047,18 @@ function render($format = 'Xhtml')
                             $this->_block = '';
                         }
 
+                        if (isset($opts['type'])) {
+                            if ($opts['type'] == 'start') {
+                                array_push($tokenStack, $rule);
+                            } elseif ($opts['type'] == 'end') {
+                                if ($tokenStack[count($tokenStack) - 1] != $rule) {
+                                    return Text_Wiki::error('Unbalanced tokens, check your syntax');
+                                } else {
+                                    array_pop($tokenStack);
+                                }
+                            }
+                        }
+
                         // yes, get the replacement text for the delimited
                         // token number and unset the flag.
                         $key = (int)$key;