basant307/AI_Governance_Project

1var baseToString = require('./_baseToString'),2    castSlice = require('./_castSlice'),3    hasUnicode = require('./_hasUnicode'),4    isObject = require('./isObject'),5    isRegExp = require('./isRegExp'),6    stringSize = require('./_stringSize'),7    stringToArray = require('./_stringToArray'),8    toInteger = require('./toInteger'),9    toString = require('./toString');10 11/** Used as default options for `_.truncate`. */12var DEFAULT_TRUNC_LENGTH = 30,13    DEFAULT_TRUNC_OMISSION = '...';14 15/** Used to match `RegExp` flags from their coerced string values. */16var reFlags = /\w*$/;17 18/**19 * Truncates `string` if it's longer than the given maximum string length.20 * The last characters of the truncated string are replaced with the omission21 * string which defaults to "...".22 *23 * @static24 * @memberOf _25 * @since 4.0.026 * @category String27 * @param {string} [string=''] The string to truncate.28 * @param {Object} [options={}] The options object.29 * @param {number} [options.length=30] The maximum string length.30 * @param {string} [options.omission='...'] The string to indicate text is omitted.31 * @param {RegExp|string} [options.separator] The separator pattern to truncate to.32 * @returns {string} Returns the truncated string.33 * @example34 *35 * _.truncate('hi-diddly-ho there, neighborino');36 * // => 'hi-diddly-ho there, neighbo...'37 *38 * _.truncate('hi-diddly-ho there, neighborino', {39 *   'length': 24,40 *   'separator': ' '41 * });42 * // => 'hi-diddly-ho there,...'43 *44 * _.truncate('hi-diddly-ho there, neighborino', {45 *   'length': 24,46 *   'separator': /,? +/47 * });48 * // => 'hi-diddly-ho there...'49 *50 * _.truncate('hi-diddly-ho there, neighborino', {51 *   'omission': ' [...]'52 * });53 * // => 'hi-diddly-ho there, neig [...]'54 */55function truncate(string, options) {56  var length = DEFAULT_TRUNC_LENGTH,57      omission = DEFAULT_TRUNC_OMISSION;58 59  if (isObject(options)) {60    var separator = 'separator' in options ? options.separator : separator;61    length = 'length' in options ? toInteger(options.length) : length;62    omission = 'omission' in options ? baseToString(options.omission) : omission;63  }64  string = toString(string);65 66  var strLength = string.length;67  if (hasUnicode(string)) {68    var strSymbols = stringToArray(string);69    strLength = strSymbols.length;70  }71  if (length >= strLength) {72    return string;73  }74  var end = length - stringSize(omission);75  if (end < 1) {76    return omission;77  }78  var result = strSymbols79    ? castSlice(strSymbols, 0, end).join('')80    : string.slice(0, end);81 82  if (separator === undefined) {83    return result + omission;84  }85  if (strSymbols) {86    end += (result.length - end);87  }88  if (isRegExp(separator)) {89    if (string.slice(end).search(separator)) {90      var match,91          substring = result;92 93      if (!separator.global) {94        separator = RegExp(separator.source, toString(reFlags.exec(separator)) + 'g');95      }96      separator.lastIndex = 0;97      while ((match = separator.exec(substring))) {98        var newEnd = match.index;99      }100      result = result.slice(0, newEnd === undefined ? end : newEnd);101    }102  } else if (string.indexOf(baseToString(separator), end) != end) {103    var index = result.lastIndexOf(separator);104    if (index > -1) {105      result = result.slice(0, index);106    }107  }108  return result + omission;109}110 111module.exports = truncate;112