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<?php
namespace ByteUnits;
use ReflectionClass;
class Parser
{
private $scale;
private $system;
public function __construct($scale, $system)
{
$this->scale = $scale;
$this->system = new ReflectionClass($system);
}
public function parse($quantityWithUnit)
{
if (preg_match('/(?P<quantity>[0-9]*\.?[0-9]+([eE][-+]?[0-9]+)?)(?P<unit>.*)/', $quantityWithUnit, $matches)) {
$quantity = $matches['quantity'];
if ($this->scale->isKnownUnit($matches['unit'])) {
$unit = $this->scale->normalizeNameOfUnit($matches['unit']);
return $this->system->newInstanceArgs([$this->scale->scaleFromUnit($quantity, $unit)]);
}
if (empty($matches['unit'])) {
return $this->system->newInstanceArgs([$quantity]);
}
}
throw new ParseException("'{$quantityWithUnit}' is not a valid byte format");
}
}