draft-js/lib/encodeEntityRanges.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
 * @emails oncall+draft_js
 */
'use strict';

import type { BlockNodeRecord } from "./BlockNodeRecord";
import type { EntityRange } from "./EntityRange";

const DraftStringKey = require("./DraftStringKey");

const UnicodeUtils = require("fbjs/lib/UnicodeUtils");

const {
  strlen
} = UnicodeUtils;
/**
 * Convert to UTF-8 character counts for storage.
 */

function encodeEntityRanges(block: BlockNodeRecord, storageMap: Object): Array<EntityRange> {
  const encoded = [];
  block.findEntityRanges(character => !!character.getEntity(), (
  /*number*/
  start,
  /*number*/
  end) => {
    const text = block.getText();
    const key = block.getEntityAt(start);
    encoded.push({
      offset: strlen(text.slice(0, start)),
      length: strlen(text.slice(start, end)),
      // Encode the key as a number for range storage.
      key: Number(storageMap[DraftStringKey.stringify(key)])
    });
  });
  return encoded;
}

module.exports = encodeEntityRanges;