import isElement from './isElement'
import _isAncestor from './_isAncestor'

/**
 * 判断 DOM 元素是否在当前文档中。
 * ========================================================================
 * @method inDocument
 * @param {String | HTMLElement} el
 * @param {Object} [doc]
 * @return {Boolean}
 */
const inDocument = (el, doc) => {
  let $doc

  if (!isElement(el)) {
    return false
  }

  $doc = doc || el.ownerDocument

  return _isAncestor($doc.documentElement, el)
}

export default inDocument