'use strict';
/*
 * Displays a helpful message and the source of
 * the format when it is invalid.
 */

function _typeof(obj) { if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

function _possibleConstructorReturn(self, call) { if (call && (_typeof(call) === "object" || typeof call === "function")) { return call; } return _assertThisInitialized(self); }

function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }

function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }

function _wrapNativeSuper(Class) { var _cache = typeof Map === "function" ? new Map() : undefined; _wrapNativeSuper = function _wrapNativeSuper(Class) { if (Class === null || !_isNativeFunction(Class)) return Class; if (typeof Class !== "function") { throw new TypeError("Super expression must either be null or a function"); } if (typeof _cache !== "undefined") { if (_cache.has(Class)) return _cache.get(Class); _cache.set(Class, Wrapper); } function Wrapper() { return _construct(Class, arguments, _getPrototypeOf(this).constructor); } Wrapper.prototype = Object.create(Class.prototype, { constructor: { value: Wrapper, enumerable: false, writable: true, configurable: true } }); return _setPrototypeOf(Wrapper, Class); }; return _wrapNativeSuper(Class); }

function isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Date.prototype.toString.call(Reflect.construct(Date, [], function () {})); return true; } catch (e) { return false; } }

function _construct(Parent, args, Class) { if (isNativeReflectConstruct()) { _construct = Reflect.construct; } else { _construct = function _construct(Parent, args, Class) { var a = [null]; a.push.apply(a, args); var Constructor = Function.bind.apply(Parent, a); var instance = new Constructor(); if (Class) _setPrototypeOf(instance, Class.prototype); return instance; }; } return _construct.apply(null, arguments); }

function _isNativeFunction(fn) { return Function.toString.call(fn).indexOf("[native code]") !== -1; }

function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }

function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }

var InvalidFormatError =
/*#__PURE__*/
function (_Error) {
  _inherits(InvalidFormatError, _Error);

  function InvalidFormatError(formatFn) {
    var _this;

    _classCallCheck(this, InvalidFormatError);

    _this = _possibleConstructorReturn(this, _getPrototypeOf(InvalidFormatError).call(this, "Format functions must be synchronous taking a two arguments: (info, opts)\nFound: ".concat(formatFn.toString().split('\n')[0], "\n")));
    Error.captureStackTrace(_assertThisInitialized(_assertThisInitialized(_this)), InvalidFormatError);
    return _this;
  }

  return InvalidFormatError;
}(_wrapNativeSuper(Error));
/*
 * function format (formatFn)
 * Returns a create function for the `formatFn`.
 */


module.exports = function (formatFn) {
  if (formatFn.length > 2) {
    throw new InvalidFormatError(formatFn);
  }
  /*
   * function Format (options)
   * Base prototype which calls a `_format`
   * function and pushes the result.
   */


  function Format() {
    var options = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};
    this.options = options;
  }

  Format.prototype.transform = formatFn; //
  // Create a function which returns new instances of
  // FormatWrap for simple syntax like:
  //
  // require('winston').formats.json();
  //

  function createFormatWrap(opts) {
    return new Format(opts);
  } //
  // Expose the FormatWrap through the create function
  // for testability.
  //


  createFormatWrap.Format = Format;
  return createFormatWrap;
};