/**
* Compress the lexer into value string until current lookahead
*
* @access public
* @return string the compressed value string
*/
public function compress()
{
$current = $this->lexer->lookahead['position'];
$this->lexer->reset();
$string = '';
while ($this->lexer->moveNext() && $this->lexer->lookahead['position'] <= $current) {
$string .= $this->lexer->lookahead['value'];
}
return $string;
}
