limiting code block

[Jeffr76]

Would there be an easy way to limit the code block size when doing an export
we have some code blocks that are large and really only need like 500 char for a given export
i have tried the following in renderer.php

function code($text, $language=null, $filename=null) {

we only want some of the code text, as they can be big
$maxsize = 200;
if (strlen($text) > $maxsize)
{

$text = substr($text, 0, $maxsize);

}
$this->_highlight('code', $text, $language);

}

but this can create invalid docs
any help would be appreciated