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

Block API for WordPress.

/**
 * Internal dependencies
 */
import { deepFilterHTML } from './utils';
import msListIgnore from './ms-list-ignore';
function isList(node) {
  return node.nodeName === 'OL' || node.nodeName === 'UL';
}
export default function msListConverter(node, doc) {
  if (node.nodeName !== 'P') {
    return;
  }
  const style = node.getAttribute('style');
  if (!style || !style.includes('mso-list')) {
    return;
  }
  const prevNode = node.previousElementSibling;

  // Add new list if no previous.
  if (!prevNode || !isList(prevNode)) {
    // See https://html.spec.whatwg.org/multipage/grouping-content.html#attr-ol-type.
    const type = node.textContent.trim().slice(0, 1);
    const isNumeric = /[1iIaA]/.test(type);
    const newListNode = doc.createElement(isNumeric ? 'ol' : 'ul');
    if (isNumeric) {
      newListNode.setAttribute('type', type);
    }
    node.parentNode.insertBefore(newListNode, node);
  }
  const listNode = node.previousElementSibling;
  const listType = listNode.nodeName;
  const listItem = doc.createElement('li');
  let receivingNode = listNode;

  // Add content.
  listItem.innerHTML = deepFilterHTML(node.innerHTML, [msListIgnore]);
  const matches = /mso-list\s*:[^;]+level([0-9]+)/i.exec(style);
  let level = matches ? parseInt(matches[1], 10) - 1 || 0 : 0;

  // Change pointer depending on indentation level.
  while (level--) {
    receivingNode = receivingNode.lastChild || receivingNode;

    // If it's a list, move pointer to the last item.
    if (isList(receivingNode)) {
      receivingNode = receivingNode.lastChild || receivingNode;
    }
  }

  // Make sure we append to a list.
  if (!isList(receivingNode)) {
    receivingNode = receivingNode.appendChild(doc.createElement(listType));
  }

  // Append the list item to the list.
  receivingNode.appendChild(listItem);

  // Remove the wrapper paragraph.
  node.parentNode.removeChild(node);
}
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