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Viewing file:     getContentStateFragment.js (1.87 KB)      -rw-r--r--

/**
 * 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
 * 
 * @emails oncall+draft_js
 */
'use strict';

var randomizeBlockMapKeys = require("./randomizeBlockMapKeys");

var removeEntitiesAtEdges = require("./removeEntitiesAtEdges");

var getContentStateFragment = function getContentStateFragment(contentState, selectionState) {
  var startKey = selectionState.getStartKey();
  var startOffset = selectionState.getStartOffset();
  var endKey = selectionState.getEndKey();
  var endOffset = selectionState.getEndOffset(); // Edge entities should be stripped to ensure that we don't preserve
  // invalid partial entities when the fragment is reused. We do, however,
  // preserve entities that are entirely within the selection range.

  var contentWithoutEdgeEntities = removeEntitiesAtEdges(contentState, selectionState);
  var blockMap = contentWithoutEdgeEntities.getBlockMap();
  var blockKeys = blockMap.keySeq();
  var startIndex = blockKeys.indexOf(startKey);
  var endIndex = blockKeys.indexOf(endKey) + 1;
  return randomizeBlockMapKeys(blockMap.slice(startIndex, endIndex).map(function (block, blockKey) {
    var text = block.getText();
    var chars = block.getCharacterList();

    if (startKey === endKey) {
      return block.merge({
        text: text.slice(startOffset, endOffset),
        characterList: chars.slice(startOffset, endOffset)
      });
    }

    if (blockKey === startKey) {
      return block.merge({
        text: text.slice(startOffset),
        characterList: chars.slice(startOffset)
      });
    }

    if (blockKey === endKey) {
      return block.merge({
        text: text.slice(0, endOffset),
        characterList: chars.slice(0, endOffset)
      });
    }

    return block;
  }));
};

module.exports = getContentStateFragment;