{"ast":null,"code":"import baseToString from './_baseToString.js';\nimport castSlice from './_castSlice.js';\nimport hasUnicode from './_hasUnicode.js';\nimport isObject from './isObject.js';\nimport isRegExp from './isRegExp.js';\nimport stringSize from './_stringSize.js';\nimport stringToArray from './_stringToArray.js';\nimport toInteger from './toInteger.js';\nimport toString from './toString.js';\n\n/** Used as default options for `_.truncate`. */\nvar DEFAULT_TRUNC_LENGTH = 30,\n  DEFAULT_TRUNC_OMISSION = '...';\n\n/** Used to match `RegExp` flags from their coerced string values. */\nvar reFlags = /\\w*$/;\n\n/**\n * Truncates `string` if it's longer than the given maximum string length.\n * The last characters of the truncated string are replaced with the omission\n * string which defaults to \"...\".\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category String\n * @param {string} [string=''] The string to truncate.\n * @param {Object} [options={}] The options object.\n * @param {number} [options.length=30] The maximum string length.\n * @param {string} [options.omission='...'] The string to indicate text is omitted.\n * @param {RegExp|string} [options.separator] The separator pattern to truncate to.\n * @returns {string} Returns the truncated string.\n * @example\n *\n * _.truncate('hi-diddly-ho there, neighborino');\n * // => 'hi-diddly-ho there, neighbo...'\n *\n * _.truncate('hi-diddly-ho there, neighborino', {\n *   'length': 24,\n *   'separator': ' '\n * });\n * // => 'hi-diddly-ho there,...'\n *\n * _.truncate('hi-diddly-ho there, neighborino', {\n *   'length': 24,\n *   'separator': /,? +/\n * });\n * // => 'hi-diddly-ho there...'\n *\n * _.truncate('hi-diddly-ho there, neighborino', {\n *   'omission': ' [...]'\n * });\n * // => 'hi-diddly-ho there, neig [...]'\n */\nfunction truncate(string, options) {\n  var length = DEFAULT_TRUNC_LENGTH,\n    omission = DEFAULT_TRUNC_OMISSION;\n  if (isObject(options)) {\n    var separator = 'separator' in options ? options.separator : separator;\n    length = 'length' in options ? toInteger(options.length) : length;\n    omission = 'omission' in options ? baseToString(options.omission) : omission;\n  }\n  string = toString(string);\n  var strLength = string.length;\n  if (hasUnicode(string)) {\n    var strSymbols = stringToArray(string);\n    strLength = strSymbols.length;\n  }\n  if (length >= strLength) {\n    return string;\n  }\n  var end = length - stringSize(omission);\n  if (end < 1) {\n    return omission;\n  }\n  var result = strSymbols ? castSlice(strSymbols, 0, end).join('') : string.slice(0, end);\n  if (separator === undefined) {\n    return result + omission;\n  }\n  if (strSymbols) {\n    end += result.length - end;\n  }\n  if (isRegExp(separator)) {\n    if (string.slice(end).search(separator)) {\n      var match,\n        substring = result;\n      if (!separator.global) {\n        separator = RegExp(separator.source, toString(reFlags.exec(separator)) + 'g');\n      }\n      separator.lastIndex = 0;\n      while (match = separator.exec(substring)) {\n        var newEnd = match.index;\n      }\n      result = result.slice(0, newEnd === undefined ? end : newEnd);\n    }\n  } else if (string.indexOf(baseToString(separator), end) != end) {\n    var index = result.lastIndexOf(separator);\n    if (index > -1) {\n      result = result.slice(0, index);\n    }\n  }\n  return result + omission;\n}\nexport default truncate;","map":null,"metadata":{},"sourceType":"module","externalDependencies":[]}