/**
* Evaluate a string as an R code and return result
* @param string $string
* @param int $parser
* @param REXP_List $attr
*/
public function evalString($string, $parser = self::PARSER_NATIVE, $attr = NULL)
{
$r = $this->command(self::CMD_eval, $string);
$i = 20;
if (!$r['is_error']) {
$buf = $r['contents'];
$r = NULL;
switch ($parser) {
case self::PARSER_NATIVE:
$r = Rserve_Parser::parse($buf, $i, $attr);
break;
case self::PARSER_REXP:
$r = Rserve_Parser::parseREXP($buf, $i, $attr);
break;
case self::PARSER_DEBUG:
$r = Rserve_Parser::parseDebug($buf, $i, $attr);
break;
case self::PARSER_NATIVE_WRAPPED:
$old = Rserve_Parser::$use_array_object;
Rserve_Parser::$use_array_object = TRUE;
$r = Rserve_Parser::parse($buf, $i, $attr);
Rserve_Parser::$use_array_object = $old;
break;
default:
throw new Exception('Unknown parser');
}
return $r;
}
// TODO: contents and code in exception
throw new Rserve_Exception('unable to evaluate');
}
/**
*
* Parse a response from Rserve
* @param string $r
* @param int $parser
* @return parsed results
*/
private function parseResponse($buf, $parser)
{
$type = int8($buf, 0);
if ($type != self::DT_SEXP) {
// Check Data type of the packet
throw new Rserve_Exception('Unexpected packet Data type (expect DT_SEXP)', $buf);
}
$i = 4;
// + 4 bytes (Data part HEADER)
$r = NULL;
switch ($parser) {
case self::PARSER_NATIVE:
$r = Rserve_Parser::parse($buf, $i);
break;
case self::PARSER_REXP:
$r = Rserve_Parser::parseREXP($buf, $i);
break;
case self::PARSER_DEBUG:
$r = Rserve_Parser::parseDebug($buf, $i);
break;
case self::PARSER_NATIVE_WRAPPED:
$old = Rserve_Parser::$use_array_object;
Rserve_Parser::$use_array_object = TRUE;
$r = Rserve_Parser::parse($buf, $i);
Rserve_Parser::$use_array_object = $old;
break;
default:
throw new Rserve_Exception('Unknown parser');
}
return $r;
}