/**
* Splits a quantity string into its syntactic parts.
*
* @see newQuantityFromParts
*
* @param string $value
*
* @throws InvalidArgumentException If $value is not a string
* @throws ParseException If $value does not match the expected pattern
* @return array list( $amount, $exactness, $margin, $unit ).
* Parts not present in $value will be null
*/
private function splitQuantityString($value)
{
if (!is_string($value)) {
throw new InvalidArgumentException('$value must be a string');
}
//TODO: allow explicitly specifying the number of significant figures
//TODO: allow explicitly specifying the uncertainty interval
$numberPattern = $this->unlocalizer->getNumberRegex('@');
$unitPattern = $this->unlocalizer->getUnitRegex('@');
$pattern = '@^' . '\\s*(' . $numberPattern . ')' . '\\s*(?:' . '([~!])' . '|(?:\\+/?-|±)\\s*(' . $numberPattern . ')' . '|' . ')' . '\\s*(' . $unitPattern . ')?' . '\\s*$@u';
if (!preg_match($pattern, $value, $groups)) {
throw new ParseException('Malformed quantity', $value, self::FORMAT_NAME);
}
// Remove $0.
array_shift($groups);
array_walk($groups, function (&$element) {
if ($element === '') {
$element = null;
}
});
return array_pad($groups, 4, null);
}
/**
* Splits a quantity string into its syntactic parts.
*
* @see newQuantityFromParts
*
* @param string $value
*
* @throws InvalidArgumentException If $value is not a string
* @throws ParseException If $value does not match the expected pattern
* @return array list( $amount, $exactness, $margin, $unit ).
* Parts not present in $value will be null
*/
private function splitQuantityString($value)
{
if (!is_string($value)) {
throw new InvalidArgumentException('$value must be a string');
}
//TODO: allow explicitly specifying the number of significant figures
//TODO: allow explicitly specifying the uncertainty interval
$numberPattern = $this->unlocalizer->getNumberRegex('@');
$unitPattern = $this->unlocalizer->getUnitRegex('@');
$pattern = '@^' . '\\s*(' . $numberPattern . ')' . '\\s*(?:' . '([~!])' . '|(?:\\+/?-|±)\\s*(' . $numberPattern . ')' . '|' . ')' . '\\s*(' . $unitPattern . ')?' . '\\s*$@u';
if (!preg_match($pattern, $value, $groups)) {
throw new ParseException('Malformed quantity', $value, self::FORMAT_NAME);
}
for ($i = 1; $i <= 4; $i++) {
if (!isset($groups[$i])) {
$groups[$i] = null;
} elseif ($groups[$i] === '') {
$groups[$i] = null;
}
}
array_shift($groups);
// remove $groups[0]
return $groups;
}
