Function countVisibleRows

frontend/src/react/components/ui/tree-utils.ts:32–69

(
  node: T,
  expandedKeys: ReadonlySet<string>,
  keyword: string,
  searchMatch: (node: T, term: string) => boolean,
  includeChildrenOnSearchMatch = false,
  parentMatches = false
)

 * pre-filtered.
 */
export function countVisibleRows<
  T extends VisibleRowNode & { readonly children?: readonly T[] },
>(
  node: T,
  expandedKeys: ReadonlySet<string>,
  keyword: string,
  searchMatch: (node: T, term: string) => boolean,
  includeChildrenOnSearchMatch = false,
  parentMatches = false
): number {
  if (!keyword) {
    let count = 1;
    if (expandedKeys.has(node.key)) {
      for (const child of node.children ?? []) {
        count += countVisibleRows(child, expandedKeys, keyword, searchMatch);
      }
    }
    return count;
  }

  const selfMatches = searchMatch(node, keyword);
  const includedByParent = includeChildrenOnSearchMatch && parentMatches;
  let childCount = 0;
  for (const child of node.children ?? []) {
    childCount += countVisibleRows(
      child,
      expandedKeys,
      keyword,
      searchMatch,
      includeChildrenOnSearchMatch,
      selfMatches
    );
  }
  if (includedByParent || selfMatches || childCount > 0) {
    return 1 + childCount;
  }
  return 0;
}