@wordpress/blocks/build-module/api/raw-handling/list-reducer.js

Block API for WordPress.

/**
 * WordPress dependencies
 */
import { unwrap } from '@wordpress/dom';
function isList(node) {
  return node.nodeName === 'OL' || node.nodeName === 'UL';
}
function shallowTextContent(element) {
  return Array.from(element.childNodes).map(({
    nodeValue = ''
  }) => nodeValue).join('');
}
export default function listReducer(node) {
  if (!isList(node)) {
    return;
  }
  const list = node;
  const prevElement = node.previousElementSibling;

  // Merge with previous list if:
  // * There is a previous list of the same type.
  // * There is only one list item.
  if (prevElement && prevElement.nodeName === node.nodeName && list.children.length === 1) {
    // Move all child nodes, including any text nodes, if any.
    while (list.firstChild) {
      prevElement.appendChild(list.firstChild);
    }
    list.parentNode.removeChild(list);
  }
  const parentElement = node.parentNode;

  // Nested list with empty parent item.
  if (parentElement && parentElement.nodeName === 'LI' && parentElement.children.length === 1 && !/\S/.test(shallowTextContent(parentElement))) {
    const parentListItem = parentElement;
    const prevListItem = parentListItem.previousElementSibling;
    const parentList = parentListItem.parentNode;
    if (prevListItem) {
      prevListItem.appendChild(list);
      parentList.removeChild(parentListItem);
    }
  }

  // Invalid: OL/UL > OL/UL.
  if (parentElement && isList(parentElement)) {
    const prevListItem = node.previousElementSibling;
    if (prevListItem) {
      prevListItem.appendChild(node);
    } else {
      unwrap(node);
    }
  }
}
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