@wordpress/components/build-module/truncate/utils.js

UI components for WordPress.

/**
 * External dependencies
 */
import { isNil } from 'lodash';
export const TRUNCATE_ELLIPSIS = '…';
export const TRUNCATE_TYPE = {
  auto: 'auto',
  head: 'head',
  middle: 'middle',
  tail: 'tail',
  none: 'none'
};
export const TRUNCATE_DEFAULT_PROPS = {
  ellipsis: TRUNCATE_ELLIPSIS,
  ellipsizeMode: TRUNCATE_TYPE.auto,
  limit: 0,
  numberOfLines: 0
}; // Source
// https://github.com/kahwee/truncate-middle

/**
 * @param {string} word
 * @param {number} headLength
 * @param {number} tailLength
 * @param {string} ellipsis
 */

export function truncateMiddle(word, headLength, tailLength, ellipsis) {
  if (typeof word !== 'string') {
    return '';
  }

  const wordLength = word.length; // Setting default values
  // eslint-disable-next-line no-bitwise

  const frontLength = ~~headLength; // will cast to integer
  // eslint-disable-next-line no-bitwise

  const backLength = ~~tailLength;
  /* istanbul ignore next */

  const truncateStr = !isNil(ellipsis) ? ellipsis : TRUNCATE_ELLIPSIS;

  if (frontLength === 0 && backLength === 0 || frontLength >= wordLength || backLength >= wordLength || frontLength + backLength >= wordLength) {
    return word;
  } else if (backLength === 0) {
    return word.slice(0, frontLength) + truncateStr;
  }

  return word.slice(0, frontLength) + truncateStr + word.slice(wordLength - backLength);
}
/**
 *
 * @param {string} words
 * @param {typeof TRUNCATE_DEFAULT_PROPS} props
 */

export function truncateContent(words = '', props) {
  const mergedProps = { ...TRUNCATE_DEFAULT_PROPS,
    ...props
  };
  const {
    ellipsis,
    ellipsizeMode,
    limit
  } = mergedProps;

  if (ellipsizeMode === TRUNCATE_TYPE.none) {
    return words;
  }

  let truncateHead;
  let truncateTail;

  switch (ellipsizeMode) {
    case TRUNCATE_TYPE.head:
      truncateHead = 0;
      truncateTail = limit;
      break;

    case TRUNCATE_TYPE.middle:
      truncateHead = Math.floor(limit / 2);
      truncateTail = Math.floor(limit / 2);
      break;

    default:
      truncateHead = limit;
      truncateTail = 0;
  }

  const truncatedContent = ellipsizeMode !== TRUNCATE_TYPE.auto ? truncateMiddle(words, truncateHead, truncateTail, ellipsis) : words;
  return truncatedContent;
}
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