d2-ui/node_modules-react-15/draft-js/lib/ContentStateInlineStyle.js

d2-ui

/**
 * Copyright (c) 2013-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 *
 * @providesModule ContentStateInlineStyle
 * @typechecks
 * 
 */

'use strict';

var CharacterMetadata = require('./CharacterMetadata');

var _require = require('immutable');

var Map = _require.Map;

var ContentStateInlineStyle = {
  add: function add(contentState, selectionState, inlineStyle) {
    return modifyInlineStyle(contentState, selectionState, inlineStyle, true);
  },

  remove: function remove(contentState, selectionState, inlineStyle) {
    return modifyInlineStyle(contentState, selectionState, inlineStyle, false);
  }
};

function modifyInlineStyle(contentState, selectionState, inlineStyle, addOrRemove) {
  var blockMap = contentState.getBlockMap();
  var startKey = selectionState.getStartKey();
  var startOffset = selectionState.getStartOffset();
  var endKey = selectionState.getEndKey();
  var endOffset = selectionState.getEndOffset();

  var newBlocks = blockMap.skipUntil(function (_, k) {
    return k === startKey;
  }).takeUntil(function (_, k) {
    return k === endKey;
  }).concat(Map([[endKey, blockMap.get(endKey)]])).map(function (block, blockKey) {
    var sliceStart;
    var sliceEnd;

    if (startKey === endKey) {
      sliceStart = startOffset;
      sliceEnd = endOffset;
    } else {
      sliceStart = blockKey === startKey ? startOffset : 0;
      sliceEnd = blockKey === endKey ? endOffset : block.getLength();
    }

    var chars = block.getCharacterList();
    var current;
    while (sliceStart < sliceEnd) {
      current = chars.get(sliceStart);
      chars = chars.set(sliceStart, addOrRemove ? CharacterMetadata.applyStyle(current, inlineStyle) : CharacterMetadata.removeStyle(current, inlineStyle));
      sliceStart++;
    }

    return block.set('characterList', chars);
  });

  return contentState.merge({
    blockMap: blockMap.merge(newBlocks),
    selectionBefore: selectionState,
    selectionAfter: selectionState
  });
}

module.exports = ContentStateInlineStyle;