draft-js/lib/DraftOffsetKey.js.flow

A React framework for building text editors.

/**
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * @format
 * @flow strict-local
 * @emails oncall+draft_js
 */
'use strict';

import type { DraftOffsetKeyPath } from "./DraftOffsetKeyPath";
const KEY_DELIMITER = '-';
const DraftOffsetKey = {
  encode: function (blockKey: string, decoratorKey: number, leafKey: number): string {
    return blockKey + KEY_DELIMITER + decoratorKey + KEY_DELIMITER + leafKey;
  },
  decode: function (offsetKey: string): DraftOffsetKeyPath {
    // Extracts the last two parts of offsetKey and captures the rest in blockKeyParts
    const [leafKey, decoratorKey, ...blockKeyParts] = offsetKey.split(KEY_DELIMITER).reverse();
    return {
      // Recomposes the parts of blockKey after reversing them
      blockKey: blockKeyParts.reverse().join(KEY_DELIMITER),
      decoratorKey: parseInt(decoratorKey, 10),
      leafKey: parseInt(leafKey, 10)
    };
  }
};
module.exports = DraftOffsetKey;