next-csrf/example/node_modules/ally.js/esm/get/insignificant-branches.js

CSRF mitigation library for Next.js

// find all highest elements within context that do not contain any of the filter elements.
// (basically the tree minus the parent paths of each filtered element reduced to the top most nodes)
// originally inspired by Marcy Sutton's Material Dialog Component:
// https://github.com/angular/material/blob/v0.11.1/src/components/dialog/dialog.js#L748-L783
// to avoid this behavior: https://marcysutton.com/slides/mobile-a11y-seattlejs/#/36

import contextToElement from '../util/context-to-element';
import nodeArray from '../util/node-array';
import { getParentComparator } from '../util/compare-position';
import getDocument from '../util/get-document';

function queryInsignificantBranches(_ref) {
  var context = _ref.context,
      filter = _ref.filter;

  var containsFilteredElement = function containsFilteredElement(node) {
    var containsNode = getParentComparator({ parent: node });
    return filter.some(containsNode);
  };

  // We'd use a Set() for this, if we could
  var insiginificantBranches = [];

  // see https://developer.mozilla.org/en-US/docs/Web/API/NodeFilter
  var CollectInsignificantBranchesFilter = function CollectInsignificantBranchesFilter(node) {
    if (filter.some(function (element) {
      return node === element;
    })) {
      // we've hit a filtered element and can ignore its children
      return NodeFilter.FILTER_REJECT;
    }

    if (containsFilteredElement(node)) {
      // we've hit a significant tree, so we'll have to keep investigating
      return NodeFilter.FILTER_ACCEPT;
    }

    // we've found an insignificant tree
    insiginificantBranches.push(node);
    return NodeFilter.FILTER_REJECT;
  };
  // IE requires a function, Browsers require {acceptNode: function}
  // see https://www.bennadel.com/blog/2607-finding-html-comment-nodes-in-the-dom-using-treewalker.htm
  CollectInsignificantBranchesFilter.acceptNode = CollectInsignificantBranchesFilter;

  var _document = getDocument(context);
  // see https://developer.mozilla.org/en-US/docs/Web/API/Document/createTreeWalker
  var walker = _document.createTreeWalker(
  // root element to start search in
  context,
  // element type filter
  NodeFilter.SHOW_ELEMENT,
  // custom NodeFilter filter
  CollectInsignificantBranchesFilter,
  // deprecated, but IE requires it
  false);

  while (walker.nextNode()) {
    // collection things is happening through the filter method
  }

  return insiginificantBranches;
}

export default function () {
  var _ref2 = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {},
      context = _ref2.context,
      filter = _ref2.filter;

  context = contextToElement({
    label: 'get/insignificant-branches',
    defaultToDocument: true,
    context: context
  });

  filter = nodeArray(filter);
  if (!filter.length) {
    throw new TypeError('get/insignificant-branches requires valid options.filter');
  }

  return queryInsignificantBranches({
    context: context,
    filter: filter
  });
}
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