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string/truncate.js

  1. "use strict";
  2. var __importDefault = (this && this.__importDefault) || function (mod) {
  3.     return (mod && mod.__esModule) ? mod : { "default": mod };
  4. };
  5. Object.defineProperty(exports, "__esModule", { value: true });
  6. var isFullWidthChar_1 = __importDefault(require("./isFullWidthChar"));
  7. /**
  8.  * Truncate string with handling of full width characters (e.g. Chinese/Japanese)
  9.  *
  10.  * @param {string} str
  11.  * @param {Object} options
  12.  *
  13.  * @returns {string}
  14.  * @category string
  15.  * @module truncate
  16.  */
  17. var truncate = function (str, options) {
  18.     if (str === void 0) { str = ''; }
  19.     var maxLength = options.length, omission = options.omission;
  20.     var length = 0;
  21.     var charIndex = 0;
  22.     var truncatedStr = '';
  23.     do {
  24.         var char = (str || '')[charIndex] || '';
  25.         if ((0, isFullWidthChar_1.default)(char)) {
  26.             if (length + 2 > maxLength)
  27.                 break;
  28.             length += 2;
  29.         }
  30.         else {
  31.             length += 1;
  32.         }
  33.         truncatedStr += char;
  34.         charIndex++;
  35.     } while (length < maxLength);
  36.     var isTruncated = (str || '').length !== truncatedStr.length;
  37.     return "".concat(truncatedStr).concat(isTruncated ? omission || '...' : '');
  38. };
  39. exports.default = truncate;