//
// The position shorthand
//
// @param  string  position
// @param  length  top
// @param  length  right
// @param  length  bottom
// @param  length  left
// @param  int     z-index
//
_position(position, top = null, right = null, bottom = null, left = null, z-index = null) {
  position: position;

  if (_is-length(top)) {
    top: top;
  }

  if (_is-length(right)) {
    right: right;
  }

  if (_is-length(bottom)) {
    bottom: bottom;
  }

  if (_is-length(left)) {
    left: left;
  }

  if (_is-int(z-index)) {
    z-index: _strip-unit(z-index);
  }
}