text: /*
   * Copyright 2020 Google LLC
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     https://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  /**
   * Internal dependencies
   */
  import { NONE, UPPERCASE } from '../customConstants';
  import {
    togglePrefixStyle,
    getPrefixStylesInSelection,
  } from '../styleManipulation';
  
  function elementToStyle(element) {
    const isSpan = element.tagName.toLowerCase() === 'span';
    const isUppercaseTransform = element.style.textTransform === 'uppercase';
    if (isSpan && isUppercaseTransform) {
      return UPPERCASE;
    }
  
    return null;
  }
  
  function stylesToCSS(styles) {
    const hasUppercase = styles.includes(UPPERCASE);
    if (!hasUppercase) {
      return null;
    }
    return { textTransform: 'uppercase' };
  }
  
  function isUppercase(editorState) {
    const styles = getPrefixStylesInSelection(editorState, UPPERCASE);
    return !styles.includes(NONE);
  }
  
  function toggleUppercase(editorState, flag) {
    if (typeof flag === 'boolean') {
      return togglePrefixStyle(editorState, UPPERCASE, () => flag);
    }
    return togglePrefixStyle(editorState, UPPERCASE);
  }
  
  const formatter = {
    elementToStyle,
    stylesToCSS,
    autoFocus: true,
    getters: {
      isUppercase,
    },
    setters: {
      toggleUppercase,
    },
  };
  
  export default formatter;
  