@atlaskit/editor-plugin-block-menu/dist/es2019/editor-commands/transform-node-utils/steps/mergeNeighbourListsStep.js

BlockMenu plugin for @atlaskit/editor-core

import { isListWithIndentation } from '../nodeChecks';
/**
 * Merges consecutive lists of the same type into a single list.
 * This step is useful after multiToListStep which may create multiple separate lists
 * that should be combined.
 *
 * Handles both nestable lists (bulletList, orderedList, taskList) and
 * non-nestable lists (decisionList).
 *
 * @example
 * Input:
 * - bulletList
 *   - listItem "1"
 * - bulletList
 *   - listItem "2"
 * - panel (non-list node)
 * - bulletList
 *   - listItem "3"
 *
 * Output:
 * - bulletList
 *   - listItem "1"
 *   - listItem "2"
 * - panel (non-list node)
 * - bulletList
 *   - listItem "3"
 *
 * @param nodes - The nodes to process
 * @param context - The transformation context
 * @returns The merged nodes
 */
export const mergeNeighbourListsStep = (nodes, context) => {
  if (nodes.length === 0) {
    return nodes;
  }
  const {
    schema
  } = context;
  const resultNodes = [];
  let currentList = null;

  // Check if a node is any type of list (including decisionList)
  const isList = node => {
    return isListWithIndentation(node.type.name, schema) || node.type.name === 'decisionList';
  };
  for (const node of nodes) {
    // Check if this node is any type of list
    if (isList(node)) {
      if (currentList && currentList.type === node.type) {
        // Merge with the current list by combining their children
        const mergedContent = currentList.content.append(node.content);
        currentList = currentList.type.create(currentList.attrs, mergedContent);
      } else {
        // Start a new list or switch to a different list type
        if (currentList) {
          resultNodes.push(currentList);
        }
        currentList = node;
      }
    } else {
      // Non-list node - push any accumulated list and then this node
      if (currentList) {
        resultNodes.push(currentList);
        currentList = null;
      }
      resultNodes.push(node);
    }
  }

  // Don't forget the last list if we ended with one
  if (currentList) {
    resultNodes.push(currentList);
  }
  return resultNodes;
};