negative instanceof fails

[schinkel-zz]

After #92 another issue seems to have been introduced concerning instanceof parsing.

Consider the following template:

{$interface = 'a_random_interface'}
{$object = 'a string'}
{if $object instanceof $interface
    || $object instanceof a_random_interface}
    <p>$object is an instance of {$interface|escape}</p>
{else}
    <p>$object NOT is an instance of {$interface|escape}</p>
{/if}

{if !$object instanceof $interface
    || !$object instanceof a_random_interface}
    <p>$object NOT is an instance of {$interface|escape}</p>
{else}
    <p>$object is an instance of {$interface|escape}</p>
{/if}

Expected output is:

$object NOT is an instance of a_random_interface
$object NOT is an instance of a_random_interface

This output is produced until Smarty 3.1.21. In following versions an error is given (output is based on Smarty 3.1.29, so after applying the fix for #92):

Fatal error: Uncaught --> Smarty Compiler: Syntax error in template "file:~/templates/correct.tpl" on line 10 "{if !$object instanceof $interface" - Unexpected " instanceof ", expected one of: "}" <-- thrown in ~/vendor/smarty/smarty/libs/sysplugins/smarty_internal_templatecompilerbase.php on line 10

Note that putting parentheses around the instanceof corrects the behaviour:

{if !($object instanceof $interface)
    || !($object instanceof a_random_interface)}
    <p>$object NOT is an instance of {$interface|escape}</p>
{else}
    <p>$object is an instance of {$interface|escape}</p>
{/if}

Following code is used to render the template:

require_once 'vendor/autoload.php';

$smarty = new \Smarty();
$smarty
    ->setCompileDir(sys_get_temp_dir())
    ->setCacheDir(sys_get_temp_dir())
    ->setPluginsDir(SMARTY_PLUGINS_DIR)
    ->disableSecurity();
$smarty->display(__DIR__ . '/templates/correct.tpl');

[uwetews]

This fix is now in the master branch and will later be included in 3.1.30