/**
* Transform a string representing a QTI valueType value in a
* the correct datatype.
*
* @param string $string The QTI valueType value as a string.
* @param integer $baseType The QTI baseType that defines the datatype of $string.
* @return mixed A converted object/primitive type.
* @throws \InvalidArgumentException If $baseType is not a value from the BaseType enumeration.
* @throws \UnexpectedValueException If $string cannot be transformed in a Value expression with the given $baseType.
*/
public static function stringToDatatype($string, $baseType)
{
if (in_array($baseType, BaseType::asArray())) {
$value = null;
switch ($baseType) {
case BaseType::BOOLEAN:
if (Format::isBoolean($string)) {
$value = Format::toLowerTrim($string) == 'true' ? true : false;
return $value;
} else {
$msg = "'{$string}' cannot be transformed into boolean.";
throw new UnexpectedValueException($msg);
}
break;
case BaseType::INTEGER:
if (Format::isInteger($string)) {
$value = intval($string);
return $value;
} else {
$msg = "'{$string}' cannot be transformed into integer.";
throw new UnexpectedValueException($msg);
}
break;
case BaseType::FLOAT:
if (Format::isFloat($string)) {
$value = floatval($string);
return $value;
} else {
$msg = "'{$string}' cannot be transformed into float.";
throw new UnexpectedValueException($msg);
}
break;
case BaseType::URI:
if (Format::isUri($string)) {
return $string;
} else {
$msg = "'{$string}' is not a valid URI.";
throw new UnexpectedValueException($msg);
}
break;
case BaseType::IDENTIFIER:
if (Format::isIdentifier($string)) {
return $string;
} else {
$msg = "'{$string}' is not a valid QTI Identifier.";
throw new UnexpectedValueException($msg);
}
break;
case BaseType::INT_OR_IDENTIFIER:
if (Format::isIdentifier($string)) {
return $string;
} elseif (Format::isInteger($string)) {
return intval($string);
} else {
$msg = "'{$string}' is not a valid QTI Identifier nor a valid integer.";
throw new UnexpectedValueException($msg);
}
break;
case BaseType::PAIR:
if (Format::isPair($string)) {
$pair = explode(" ", $string);
return new Pair($pair[0], $pair[1]);
} else {
$msg = "'{$string}' is not a valid pair.";
throw new UnexpectedValueException($msg);
}
break;
case BaseType::DIRECTED_PAIR:
if (Format::isDirectedPair($string)) {
$pair = explode(" ", $string);
return new DirectedPair($pair[0], $pair[1]);
} else {
$msg = "'{$string}' is not a valid directed pair.";
throw new UnexpectedValueException($msg);
}
break;
case BaseType::DURATION:
if (Format::isDuration($string)) {
return new Duration($string);
} else {
$msg = "'{$string}' is not a valid duration.";
throw new UnexpectedValueException($msg);
}
break;
case BaseType::FILE:
throw new \RuntimeException("Unsupported baseType: file.");
break;
case BaseType::STRING:
return '' . $string;
break;
case BaseType::POINT:
if (Format::isPoint($string)) {
$parts = explode(" ", $string);
return new Point(intval($parts[0]), intval($parts[1]));
} else {
$msg = "'{$string}' is not valid point.";
throw new UnexpectedValueException($msg);
}
break;
default:
throw new \RuntimeException("Unknown baseType.");
break;
}
} else {
$msg = "BaseType must be a value from the BaseType enumeration.";
throw new InvalidArgumentException($msg);
}
}