next-csrf/example/node_modules/ally.js/util/compare-position.js

CSRF mitigation library for Next.js

'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.getParentComparator = getParentComparator;

// Node.compareDocumentPosition is available since IE9
// see https://developer.mozilla.org/en-US/docs/Web/API/Node.compareDocumentPosition

// callback returns true when element is contained by parent or is the parent suited for use with Array.some()
/*
  USAGE:
    var isChildOf = getParentComparator({parent: someNode});
    listOfElements.some(isChildOf)
*/

function getParentComparator() {
  var _ref = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {},
      parent = _ref.parent,
      element = _ref.element,
      includeSelf = _ref.includeSelf;

  if (parent) {
    return function isChildOf(node) {
      return Boolean(includeSelf && node === parent || parent.compareDocumentPosition(node) & Node.DOCUMENT_POSITION_CONTAINED_BY);
    };
  } else if (element) {
    return function isParentOf(node) {
      return Boolean(includeSelf && element === node || node.compareDocumentPosition(element) & Node.DOCUMENT_POSITION_CONTAINED_BY);
    };
  }

  throw new TypeError('util/compare-position#getParentComparator required either options.parent or options.element');
}
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