Function getInheritableFieldNumber

src/document/forms/fields/factory.ts:105–133

* Get inheritable number value from field hierarchy.

(dict: PdfDict, key: string, registry: ObjectRegistry)

 * Get inheritable number value from field hierarchy.
 */
function getInheritableFieldNumber(dict: PdfDict, key: string, registry: ObjectRegistry): number {
  let current: PdfDict | null = dict;
  const visited = new Set<PdfDict>();
  const resolve = registry.resolve.bind(registry);

  while (current) {
    if (visited.has(current)) {
      break;
    }

    visited.add(current);

    const value = current.getNumber(key, resolve);

    if (value) {
      return value.value;
    }

    const parent = current.getDict("Parent", resolve);

    if (!parent) {
      break;
    }

    current = parent;
  }

  return 0;
}