'use strict';

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

module.exports = function is_callable(mixedVar, syntaxOnly, callableName) {
  // eslint-disable-line camelcase
  //  discuss at: http://locutus.io/php/is_callable/
  // original by: Brett Zamir (http://brett-zamir.me)
  //    input by: François
  // improved by: Brett Zamir (http://brett-zamir.me)
  //      note 1: The variable callableName cannot work as a string variable passed by
  //      note 1: reference as in PHP (since JavaScript does not support passing
  //      note 1: strings by reference), but instead will take the name of
  //      note 1: a global variable and set that instead.
  //      note 1: When used on an object, depends on a constructor property
  //      note 1: being kept on the object prototype
  //      note 2: Depending on the `callableName` that is passed, this function can use eval.
  //      note 2: The eval input is however checked to only allow valid function names,
  //      note 2: So it should not be unsafer than uses without eval (seeing as you can)
  //      note 2: already pass any function to be executed here.
  //   example 1: is_callable('is_callable')
  //   returns 1: true
  //   example 2: is_callable('bogusFunction', true)
  //   returns 2: true // gives true because does not do strict checking
  //   example 3: function SomeClass () {}
  //   example 3: SomeClass.prototype.someMethod = function (){}
  //   example 3: var testObj = new SomeClass()
  //   example 3: is_callable([testObj, 'someMethod'], true, 'myVar')
  //   example 3: var $result = myVar
  //   returns 3: 'SomeClass::someMethod'
  //   example 4: is_callable(function () {})
  //   returns 4: true

  var $global = typeof window !== 'undefined' ? window : global;

  var validJSFunctionNamePattern = /^[_$a-zA-Z\xA0-\uFFFF][_$a-zA-Z0-9\xA0-\uFFFF]*$/;

  var name = '';
  var obj = {};
  var method = '';
  var validFunctionName = false;

  var getFuncName = function getFuncName(fn) {
    var name = /\W*function\s+([\w$]+)\s*\(/.exec(fn);
    if (!name) {
      return '(Anonymous)';
    }
    return name[1];
  };

  if (typeof mixedVar === 'string') {
    obj = $global;
    method = mixedVar;
    name = mixedVar;
    validFunctionName = !!name.match(validJSFunctionNamePattern);
  } else if (typeof mixedVar === 'function') {
    return true;
  } else if (Object.prototype.toString.call(mixedVar) === '[object Array]' && mixedVar.length === 2 && _typeof(mixedVar[0]) === 'object' && typeof mixedVar[1] === 'string') {
    obj = mixedVar[0];
    method = mixedVar[1];
    name = (obj.constructor && getFuncName(obj.constructor)) + '::' + method;
  } else {
    return false;
  }

  if (syntaxOnly || typeof obj[method] === 'function') {
    if (callableName) {
      $global[callableName] = name;
    }
    return true;
  }

  // validFunctionName avoids exploits
  if (validFunctionName && typeof eval(method) === 'function') {
    // eslint-disable-line no-eval
    if (callableName) {
      $global[callableName] = name;
    }
    return true;
  }

  return false;
};
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