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Viewing file:     insertTextIntoContentState.js (1.5 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 Immutable = require("immutable");

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

var invariant = require("fbjs/lib/invariant");

var Repeat = Immutable.Repeat;

function insertTextIntoContentState(contentState, selectionState, text, characterMetadata) {
  !selectionState.isCollapsed() ? process.env.NODE_ENV !== "production" ? invariant(false, '`insertText` should only be called with a collapsed range.') : invariant(false) : void 0;
  var len = null;

  if (text != null) {
    len = text.length;
  }

  if (len == null || len === 0) {
    return contentState;
  }

  var blockMap = contentState.getBlockMap();
  var key = selectionState.getStartKey();
  var offset = selectionState.getStartOffset();
  var block = blockMap.get(key);
  var blockText = block.getText();
  var newBlock = block.merge({
    text: blockText.slice(0, offset) + text + blockText.slice(offset, block.getLength()),
    characterList: insertIntoList(block.getCharacterList(), Repeat(characterMetadata, len).toList(), offset)
  });
  var newOffset = offset + len;
  return contentState.merge({
    blockMap: blockMap.set(key, newBlock),
    selectionAfter: selectionState.merge({
      anchorOffset: newOffset,
      focusOffset: newOffset
    })
  });
}

module.exports = insertTextIntoContentState;