# ------------------------------------------------------------------------------

dim_rset <- function(x, ...) {
  dims <- purrr::map(x$splits, dim)
  dims <- do.call("rbind", dims)
  dims <- tibble::as_tibble(dims)
  id_cols <- grep("^id", colnames(x), value = TRUE)
  for (i in seq_along(id_cols)) {
    dims[id_cols[i]] <- getElement(x, id_cols[i])
  }
  dims
}

# ------------------------------------------------------------------------------

tib_upcast <- function(x) {
  size <- df_size(x)

  # Strip all attributes except names to construct
  # a bare list to build the tibble back up from.
  attributes(x) <- list(names = names(x))

  tibble::new_tibble(x, nrow = size)
}

df_size <- function(x) {
  if (!is.list(x)) {
    rlang::abort("Cannot get the df size of a non-list.")
  }

  if (length(x) == 0L) {
    return(0L)
  }

  col <- x[[1L]]

  vec_size(col)
}

# ------------------------------------------------------------------------------

expect_s3_class_rset <- function(x) {
  expect_s3_class(x, "rset")
}

expect_s3_class_bare_tibble <- function(x) {
  expect_s3_class(x, c("tbl_df", "tbl", "data.frame"), exact = TRUE)
}