<?hh //strict

final class Arugments
{

  private int $position = 0;
  private Vector<string> $args;

  public function __construct(
    Traversable<string> $args = []
  )
  {
    $this->args = Vector::fromItems($args);
  }

  public function current(): string {
    return $this->args->at($this->position);
  }

  public function valid(): bool {
    return $this->args->count() > $this->position;
  }

  public function next(): string {
    return $this->args->at($this->position + 1);
  }

  public function has(int $number): int {
    $willConsumedAt = $this->position + $number;
    return $this->args->count() >= $willConsumedAt;
  }

  public function take(int $value): Vector<string> {
    return $this->args->slice($this->position, $value);
  }

  public function consume(int $value = 1) {
    $this->position += $value;
  }

}