File: /var/dev/nowruzgan/rest/node_modules/async/dist/async.js
(function (global, factory) {
typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
typeof define === 'function' && define.amd ? define(['exports'], factory) :
(factory((global.async = global.async || {})));
}(this, function (exports) { 'use strict';
/**
* A faster alternative to `Function#apply`, this function invokes `func`
* with the `this` binding of `thisArg` and the arguments of `args`.
*
* @private
* @param {Function} func The function to invoke.
* @param {*} thisArg The `this` binding of `func`.
* @param {Array} args The arguments to invoke `func` with.
* @returns {*} Returns the result of `func`.
*/
function apply(func, thisArg, args) {
var length = args.length;
switch (length) {
case 0: return func.call(thisArg);
case 1: return func.call(thisArg, args[0]);
case 2: return func.call(thisArg, args[0], args[1]);
case 3: return func.call(thisArg, args[0], args[1], args[2]);
}
return func.apply(thisArg, args);
}
/**
* Checks if `value` is the
* [language type](http://www.ecma-international.org/ecma-262/6.0/#sec-ecmascript-language-types)
* of `Object`. (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)
*
* @static
* @memberOf _
* @since 0.1.0
* @category Lang
* @param {*} value The value to check.
* @returns {boolean} Returns `true` if `value` is an object, else `false`.
* @example
*
* _.isObject({});
* // => true
*
* _.isObject([1, 2, 3]);
* // => true
*
* _.isObject(_.noop);
* // => true
*
* _.isObject(null);
* // => false
*/
function isObject(value) {
var type = typeof value;
return !!value && (type == 'object' || type == 'function');
}
var funcTag = '[object Function]';
var genTag = '[object GeneratorFunction]';
/** Used for built-in method references. */
var objectProto = Object.prototype;
/**
* Used to resolve the
* [`toStringTag`](http://ecma-international.org/ecma-262/6.0/#sec-object.prototype.tostring)
* of values.
*/
var objectToString = objectProto.toString;
/**
* Checks if `value` is classified as a `Function` object.
*
* @static
* @memberOf _
* @since 0.1.0
* @category Lang
* @param {*} value The value to check.
* @returns {boolean} Returns `true` if `value` is correctly classified,
* else `false`.
* @example
*
* _.isFunction(_);
* // => true
*
* _.isFunction(/abc/);
* // => false
*/
function isFunction(value) {
// The use of `Object#toString` avoids issues with the `typeof` operator
// in Safari 8 which returns 'object' for typed array and weak map constructors,
// and PhantomJS 1.9 which returns 'function' for `NodeList` instances.
var tag = isObject(value) ? objectToString.call(value) : '';
return tag == funcTag || tag == genTag;
}
/**
* Checks if `value` is object-like. A value is object-like if it's not `null`
* and has a `typeof` result of "object".
*
* @static
* @memberOf _
* @since 4.0.0
* @category Lang
* @param {*} value The value to check.
* @returns {boolean} Returns `true` if `value` is object-like, else `false`.
* @example
*
* _.isObjectLike({});
* // => true
*
* _.isObjectLike([1, 2, 3]);
* // => true
*
* _.isObjectLike(_.noop);
* // => false
*
* _.isObjectLike(null);
* // => false
*/
function isObjectLike(value) {
return !!value && typeof value == 'object';
}
/** `Object#toString` result references. */
var symbolTag = '[object Symbol]';
/** Used for built-in method references. */
var objectProto$1 = Object.prototype;
/**
* Used to resolve the
* [`toStringTag`](http://ecma-international.org/ecma-262/6.0/#sec-object.prototype.tostring)
* of values.
*/
var objectToString$1 = objectProto$1.toString;
/**
* Checks if `value` is classified as a `Symbol` primitive or object.
*
* @static
* @memberOf _
* @since 4.0.0
* @category Lang
* @param {*} value The value to check.
* @returns {boolean} Returns `true` if `value` is correctly classified,
* else `false`.
* @example
*
* _.isSymbol(Symbol.iterator);
* // => true
*
* _.isSymbol('abc');
* // => false
*/
function isSymbol(value) {
return typeof value == 'symbol' ||
(isObjectLike(value) && objectToString$1.call(value) == symbolTag);
}
/** Used as references for various `Number` constants. */
var NAN = 0 / 0;
/** Used to match leading and trailing whitespace. */
var reTrim = /^\s+|\s+$/g;
/** Used to detect bad signed hexadecimal string values. */
var reIsBadHex = /^[-+]0x[0-9a-f]+$/i;
/** Used to detect binary string values. */
var reIsBinary = /^0b[01]+$/i;
/** Used to detect octal string values. */
var reIsOctal = /^0o[0-7]+$/i;
/** Built-in method references without a dependency on `root`. */
var freeParseInt = parseInt;
/**
* Converts `value` to a number.
*
* @static
* @memberOf _
* @since 4.0.0
* @category Lang
* @param {*} value The value to process.
* @returns {number} Returns the number.
* @example
*
* _.toNumber(3.2);
* // => 3.2
*
* _.toNumber(Number.MIN_VALUE);
* // => 5e-324
*
* _.toNumber(Infinity);
* // => Infinity
*
* _.toNumber('3.2');
* // => 3.2
*/
function toNumber(value) {
if (typeof value == 'number') {
return value;
}
if (isSymbol(value)) {
return NAN;
}
if (isObject(value)) {
var other = isFunction(value.valueOf) ? value.valueOf() : value;
value = isObject(other) ? (other + '') : other;
}
if (typeof value != 'string') {
return value === 0 ? value : +value;
}
value = value.replace(reTrim, '');
var isBinary = reIsBinary.test(value);
return (isBinary || reIsOctal.test(value))
? freeParseInt(value.slice(2), isBinary ? 2 : 8)
: (reIsBadHex.test(value) ? NAN : +value);
}
var INFINITY = 1 / 0;
var MAX_INTEGER = 1.7976931348623157e+308;
/**
* Converts `value` to a finite number.
*
* @static
* @memberOf _
* @since 4.12.0
* @category Lang
* @param {*} value The value to convert.
* @returns {number} Returns the converted number.
* @example
*
* _.toFinite(3.2);
* // => 3.2
*
* _.toFinite(Number.MIN_VALUE);
* // => 5e-324
*
* _.toFinite(Infinity);
* // => 1.7976931348623157e+308
*
* _.toFinite('3.2');
* // => 3.2
*/
function toFinite(value) {
if (!value) {
return value === 0 ? value : 0;
}
value = toNumber(value);
if (value === INFINITY || value === -INFINITY) {
var sign = (value < 0 ? -1 : 1);
return sign * MAX_INTEGER;
}
return value === value ? value : 0;
}
/**
* Converts `value` to an integer.
*
* **Note:** This method is loosely based on
* [`ToInteger`](http://www.ecma-international.org/ecma-262/6.0/#sec-tointeger).
*
* @static
* @memberOf _
* @since 4.0.0
* @category Lang
* @param {*} value The value to convert.
* @returns {number} Returns the converted integer.
* @example
*
* _.toInteger(3.2);
* // => 3
*
* _.toInteger(Number.MIN_VALUE);
* // => 0
*
* _.toInteger(Infinity);
* // => 1.7976931348623157e+308
*
* _.toInteger('3.2');
* // => 3
*/
function toInteger(value) {
var result = toFinite(value),
remainder = result % 1;
return result === result ? (remainder ? result - remainder : result) : 0;
}
/** Used as the `TypeError` message for "Functions" methods. */
var FUNC_ERROR_TEXT = 'Expected a function';
/* Built-in method references for those with the same name as other `lodash` methods. */
var nativeMax = Math.max;
/**
* Creates a function that invokes `func` with the `this` binding of the
* created function and arguments from `start` and beyond provided as
* an array.
*
* **Note:** This method is based on the
* [rest parameter](https://mdn.io/rest_parameters).
*
* @static
* @memberOf _
* @since 4.0.0
* @category Function
* @param {Function} func The function to apply a rest parameter to.
* @param {number} [start=func.length-1] The start position of the rest parameter.
* @returns {Function} Returns the new function.
* @example
*
* var say = _.rest(function(what, names) {
* return what + ' ' + _.initial(names).join(', ') +
* (_.size(names) > 1 ? ', & ' : '') + _.last(names);
* });
*
* say('hello', 'fred', 'barney', 'pebbles');
* // => 'hello fred, barney, & pebbles'
*/
function rest(func, start) {
if (typeof func != 'function') {
throw new TypeError(FUNC_ERROR_TEXT);
}
start = nativeMax(start === undefined ? (func.length - 1) : toInteger(start), 0);
return function() {
var args = arguments,
index = -1,
length = nativeMax(args.length - start, 0),
array = Array(length);
while (++index < length) {
array[index] = args[start + index];
}
switch (start) {
case 0: return func.call(this, array);
case 1: return func.call(this, args[0], array);
case 2: return func.call(this, args[0], args[1], array);
}
var otherArgs = Array(start + 1);
index = -1;
while (++index < start) {
otherArgs[index] = args[index];
}
otherArgs[start] = array;
return apply(func, this, otherArgs);
};
}
function initialParams (fn) {
return rest(function (args /*..., callback*/) {
var callback = args.pop();
fn.call(this, args, callback);
});
}
function applyEach$1(eachfn) {
return rest(function (fns, args) {
var go = initialParams(function (args, callback) {
var that = this;
return eachfn(fns, function (fn, cb) {
fn.apply(that, args.concat([cb]));
}, callback);
});
if (args.length) {
return go.apply(this, args);
} else {
return go;
}
});
}
/**
* The base implementation of `_.property` without support for deep paths.
*
* @private
* @param {string} key The key of the property to get.
* @returns {Function} Returns the new accessor function.
*/
function baseProperty(key) {
return function(object) {
return object == null ? undefined : object[key];
};
}
/**
* Gets the "length" property value of `object`.
*
* **Note:** This function is used to avoid a
* [JIT bug](https://bugs.webkit.org/show_bug.cgi?id=142792) that affects
* Safari on at least iOS 8.1-8.3 ARM64.
*
* @private
* @param {Object} object The object to query.
* @returns {*} Returns the "length" value.
*/
var getLength = baseProperty('length');
/** Used as references for various `Number` constants. */
var MAX_SAFE_INTEGER = 9007199254740991;
/**
* Checks if `value` is a valid array-like length.
*
* **Note:** This function is loosely based on
* [`ToLength`](http://ecma-international.org/ecma-262/6.0/#sec-tolength).
*
* @static
* @memberOf _
* @since 4.0.0
* @category Lang
* @param {*} value The value to check.
* @returns {boolean} Returns `true` if `value` is a valid length,
* else `false`.
* @example
*
* _.isLength(3);
* // => true
*
* _.isLength(Number.MIN_VALUE);
* // => false
*
* _.isLength(Infinity);
* // => false
*
* _.isLength('3');
* // => false
*/
function isLength(value) {
return typeof value == 'number' &&
value > -1 && value % 1 == 0 && value <= MAX_SAFE_INTEGER;
}
/**
* Checks if `value` is array-like. A value is considered array-like if it's
* not a function and has a `value.length` that's an integer greater than or
* equal to `0` and less than or equal to `Number.MAX_SAFE_INTEGER`.
*
* @static
* @memberOf _
* @since 4.0.0
* @category Lang
* @param {*} value The value to check.
* @returns {boolean} Returns `true` if `value` is array-like, else `false`.
* @example
*
* _.isArrayLike([1, 2, 3]);
* // => true
*
* _.isArrayLike(document.body.children);
* // => true
*
* _.isArrayLike('abc');
* // => true
*
* _.isArrayLike(_.noop);
* // => false
*/
function isArrayLike(value) {
return value != null && isLength(getLength(value)) && !isFunction(value);
}
/**
* A method that returns `undefined`.
*
* @static
* @memberOf _
* @since 2.3.0
* @category Util
* @example
*
* _.times(2, _.noop);
* // => [undefined, undefined]
*/
function noop() {
// No operation performed.
}
function once(fn) {
return function () {
if (fn === null) return;
var callFn = fn;
fn = null;
callFn.apply(this, arguments);
};
}
var iteratorSymbol = typeof Symbol === 'function' && Symbol.iterator;
function getIterator (coll) {
return iteratorSymbol && coll[iteratorSymbol] && coll[iteratorSymbol]();
}
/* Built-in method references for those with the same name as other `lodash` methods. */
var nativeGetPrototype = Object.getPrototypeOf;
/**
* Gets the `[[Prototype]]` of `value`.
*
* @private
* @param {*} value The value to query.
* @returns {null|Object} Returns the `[[Prototype]]`.
*/
function getPrototype(value) {
return nativeGetPrototype(Object(value));
}
/** Used for built-in method references. */
var objectProto$2 = Object.prototype;
/** Used to check objects for own properties. */
var hasOwnProperty = objectProto$2.hasOwnProperty;
/**
* The base implementation of `_.has` without support for deep paths.
*
* @private
* @param {Object} [object] The object to query.
* @param {Array|string} key The key to check.
* @returns {boolean} Returns `true` if `key` exists, else `false`.
*/
function baseHas(object, key) {
// Avoid a bug in IE 10-11 where objects with a [[Prototype]] of `null`,
// that are composed entirely of index properties, return `false` for
// `hasOwnProperty` checks of them.
return object != null &&
(hasOwnProperty.call(object, key) ||
(typeof object == 'object' && key in object && getPrototype(object) === null));
}
/* Built-in method references for those with the same name as other `lodash` methods. */
var nativeKeys = Object.keys;
/**
* The base implementation of `_.keys` which doesn't skip the constructor
* property of prototypes or treat sparse arrays as dense.
*
* @private
* @param {Object} object The object to query.
* @returns {Array} Returns the array of property names.
*/
function baseKeys(object) {
return nativeKeys(Object(object));
}
/**
* The base implementation of `_.times` without support for iteratee shorthands
* or max array length checks.
*
* @private
* @param {number} n The number of times to invoke `iteratee`.
* @param {Function} iteratee The function invoked per iteration.
* @returns {Array} Returns the array of results.
*/
function baseTimes(n, iteratee) {
var index = -1,
result = Array(n);
while (++index < n) {
result[index] = iteratee(index);
}
return result;
}
/**
* This method is like `_.isArrayLike` except that it also checks if `value`
* is an object.
*
* @static
* @memberOf _
* @since 4.0.0
* @category Lang
* @param {*} value The value to check.
* @returns {boolean} Returns `true` if `value` is an array-like object,
* else `false`.
* @example
*
* _.isArrayLikeObject([1, 2, 3]);
* // => true
*
* _.isArrayLikeObject(document.body.children);
* // => true
*
* _.isArrayLikeObject('abc');
* // => false
*
* _.isArrayLikeObject(_.noop);
* // => false
*/
function isArrayLikeObject(value) {
return isObjectLike(value) && isArrayLike(value);
}
/** `Object#toString` result references. */
var argsTag = '[object Arguments]';
/** Used for built-in method references. */
var objectProto$3 = Object.prototype;
/** Used to check objects for own properties. */
var hasOwnProperty$1 = objectProto$3.hasOwnProperty;
/**
* Used to resolve the
* [`toStringTag`](http://ecma-international.org/ecma-262/6.0/#sec-object.prototype.tostring)
* of values.
*/
var objectToString$2 = objectProto$3.toString;
/** Built-in value references. */
var propertyIsEnumerable = objectProto$3.propertyIsEnumerable;
/**
* Checks if `value` is likely an `arguments` object.
*
* @static
* @memberOf _
* @since 0.1.0
* @category Lang
* @param {*} value The value to check.
* @returns {boolean} Returns `true` if `value` is correctly classified,
* else `false`.
* @example
*
* _.isArguments(function() { return arguments; }());
* // => true
*
* _.isArguments([1, 2, 3]);
* // => false
*/
function isArguments(value) {
// Safari 8.1 incorrectly makes `arguments.callee` enumerable in strict mode.
return isArrayLikeObject(value) && hasOwnProperty$1.call(value, 'callee') &&
(!propertyIsEnumerable.call(value, 'callee') || objectToString$2.call(value) == argsTag);
}
/**
* Checks if `value` is classified as an `Array` object.
*
* @static
* @memberOf _
* @since 0.1.0
* @type {Function}
* @category Lang
* @param {*} value The value to check.
* @returns {boolean} Returns `true` if `value` is correctly classified,
* else `false`.
* @example
*
* _.isArray([1, 2, 3]);
* // => true
*
* _.isArray(document.body.children);
* // => false
*
* _.isArray('abc');
* // => false
*
* _.isArray(_.noop);
* // => false
*/
var isArray = Array.isArray;
/** `Object#toString` result references. */
var stringTag = '[object String]';
/** Used for built-in method references. */
var objectProto$4 = Object.prototype;
/**
* Used to resolve the
* [`toStringTag`](http://ecma-international.org/ecma-262/6.0/#sec-object.prototype.tostring)
* of values.
*/
var objectToString$3 = objectProto$4.toString;
/**
* Checks if `value` is classified as a `String` primitive or object.
*
* @static
* @since 0.1.0
* @memberOf _
* @category Lang
* @param {*} value The value to check.
* @returns {boolean} Returns `true` if `value` is correctly classified,
* else `false`.
* @example
*
* _.isString('abc');
* // => true
*
* _.isString(1);
* // => false
*/
function isString(value) {
return typeof value == 'string' ||
(!isArray(value) && isObjectLike(value) && objectToString$3.call(value) == stringTag);
}
/**
* Creates an array of index keys for `object` values of arrays,
* `arguments` objects, and strings, otherwise `null` is returned.
*
* @private
* @param {Object} object The object to query.
* @returns {Array|null} Returns index keys, else `null`.
*/
function indexKeys(object) {
var length = object ? object.length : undefined;
if (isLength(length) &&
(isArray(object) || isString(object) || isArguments(object))) {
return baseTimes(length, String);
}
return null;
}
/** Used as references for various `Number` constants. */
var MAX_SAFE_INTEGER$1 = 9007199254740991;
/** Used to detect unsigned integer values. */
var reIsUint = /^(?:0|[1-9]\d*)$/;
/**
* Checks if `value` is a valid array-like index.
*
* @private
* @param {*} value The value to check.
* @param {number} [length=MAX_SAFE_INTEGER] The upper bounds of a valid index.
* @returns {boolean} Returns `true` if `value` is a valid index, else `false`.
*/
function isIndex(value, length) {
length = length == null ? MAX_SAFE_INTEGER$1 : length;
return !!length &&
(typeof value == 'number' || reIsUint.test(value)) &&
(value > -1 && value % 1 == 0 && value < length);
}
/** Used for built-in method references. */
var objectProto$5 = Object.prototype;
/**
* Checks if `value` is likely a prototype object.
*
* @private
* @param {*} value The value to check.
* @returns {boolean} Returns `true` if `value` is a prototype, else `false`.
*/
function isPrototype(value) {
var Ctor = value && value.constructor,
proto = (typeof Ctor == 'function' && Ctor.prototype) || objectProto$5;
return value === proto;
}
/**
* Creates an array of the own enumerable property names of `object`.
*
* **Note:** Non-object values are coerced to objects. See the
* [ES spec](http://ecma-international.org/ecma-262/6.0/#sec-object.keys)
* for more details.
*
* @static
* @since 0.1.0
* @memberOf _
* @category Object
* @param {Object} object The object to query.
* @returns {Array} Returns the array of property names.
* @example
*
* function Foo() {
* this.a = 1;
* this.b = 2;
* }
*
* Foo.prototype.c = 3;
*
* _.keys(new Foo);
* // => ['a', 'b'] (iteration order is not guaranteed)
*
* _.keys('hi');
* // => ['0', '1']
*/
function keys(object) {
var isProto = isPrototype(object);
if (!(isProto || isArrayLike(object))) {
return baseKeys(object);
}
var indexes = indexKeys(object),
skipIndexes = !!indexes,
result = indexes || [],
length = result.length;
for (var key in object) {
if (baseHas(object, key) &&
!(skipIndexes && (key == 'length' || isIndex(key, length))) &&
!(isProto && key == 'constructor')) {
result.push(key);
}
}
return result;
}
function createArrayIterator(coll) {
var i = -1;
var len = coll.length;
return function next() {
return ++i < len ? { value: coll[i], key: i } : null;
};
}
function createES2015Iterator(iterator) {
var i = -1;
return function next() {
var item = iterator.next();
if (item.done) return null;
i++;
return { value: item.value, key: i };
};
}
function createObjectIterator(obj) {
var okeys = keys(obj);
var i = -1;
var len = okeys.length;
return function next() {
var key = okeys[++i];
return i < len ? { value: obj[key], key: key } : null;
};
}
function iterator(coll) {
if (isArrayLike(coll)) {
return createArrayIterator(coll);
}
var iterator = getIterator(coll);
return iterator ? createES2015Iterator(iterator) : createObjectIterator(coll);
}
function onlyOnce(fn) {
return function () {
if (fn === null) throw new Error("Callback was already called.");
var callFn = fn;
fn = null;
callFn.apply(this, arguments);
};
}
function _eachOfLimit(limit) {
return function (obj, iteratee, callback) {
callback = once(callback || noop);
if (limit <= 0 || !obj) {
return callback(null);
}
var nextElem = iterator(obj);
var done = false;
var running = 0;
function iterateeCallback(err) {
running -= 1;
if (err) {
done = true;
callback(err);
} else if (done && running <= 0) {
return callback(null);
} else {
replenish();
}
}
function replenish() {
while (running < limit && !done) {
var elem = nextElem();
if (elem === null) {
done = true;
if (running <= 0) {
callback(null);
}
return;
}
running += 1;
iteratee(elem.value, elem.key, onlyOnce(iterateeCallback));
}
}
replenish();
};
}
/**
* The same as [`eachOf`]{@link module:Collections.eachOf} but runs a maximum of `limit` async operations at a
* time.
*
* @name eachOfLimit
* @static
* @memberOf module:Collections
* @method
* @see [async.eachOf]{@link module:Collections.eachOf}
* @alias forEachOfLimit
* @category Collection
* @param {Array|Iterable|Object} coll - A collection to iterate over.
* @param {number} limit - The maximum number of async operations at a time.
* @param {Function} iteratee - A function to apply to each
* item in `coll`. The `key` is the item's key, or index in the case of an
* array. The iteratee is passed a `callback(err)` which must be called once it
* has completed. If no error has occurred, the callback should be run without
* arguments or with an explicit `null` argument. Invoked with
* (item, key, callback).
* @param {Function} [callback] - A callback which is called when all
* `iteratee` functions have finished, or an error occurs. Invoked with (err).
*/
function eachOfLimit(coll, limit, iteratee, callback) {
_eachOfLimit(limit)(coll, iteratee, callback);
}
function doLimit(fn, limit) {
return function (iterable, iteratee, callback) {
return fn(iterable, limit, iteratee, callback);
};
}
/** Used as the `TypeError` message for "Functions" methods. */
var FUNC_ERROR_TEXT$1 = 'Expected a function';
/**
* Creates a function that invokes `func`, with the `this` binding and arguments
* of the created function, while it's called less than `n` times. Subsequent
* calls to the created function return the result of the last `func` invocation.
*
* @static
* @memberOf _
* @since 3.0.0
* @category Function
* @param {number} n The number of calls at which `func` is no longer invoked.
* @param {Function} func The function to restrict.
* @returns {Function} Returns the new restricted function.
* @example
*
* jQuery(element).on('click', _.before(5, addContactToList));
* // => allows adding up to 4 contacts to the list
*/
function before(n, func) {
var result;
if (typeof func != 'function') {
throw new TypeError(FUNC_ERROR_TEXT$1);
}
n = toInteger(n);
return function() {
if (--n > 0) {
result = func.apply(this, arguments);
}
if (n <= 1) {
func = undefined;
}
return result;
};
}
/**
* Creates a function that is restricted to invoking `func` once. Repeat calls
* to the function return the value of the first invocation. The `func` is
* invoked with the `this` binding and arguments of the created function.
*
* @static
* @memberOf _
* @since 0.1.0
* @category Function
* @param {Function} func The function to restrict.
* @returns {Function} Returns the new restricted function.
* @example
*
* var initialize = _.once(createApplication);
* initialize();
* initialize();
* // `initialize` invokes `createApplication` once
*/
function once$1(func) {
return before(2, func);
}
// eachOf implementation optimized for array-likes
function eachOfArrayLike(coll, iteratee, callback) {
callback = once$1(callback || noop);
var index = 0,
completed = 0,
length = coll.length;
if (length === 0) {
callback(null);
}
function iteratorCallback(err) {
if (err) {
callback(err);
} else if (++completed === length) {
callback(null);
}
}
for (; index < length; index++) {
iteratee(coll[index], index, onlyOnce(iteratorCallback));
}
}
// a generic version of eachOf which can handle array, object, and iterator cases.
var eachOfGeneric = doLimit(eachOfLimit, Infinity);
/**
* Like [`each`]{@link module:Collections.each}, except that it passes the key (or index) as the second argument
* to the iteratee.
*
* @name eachOf
* @static
* @memberOf module:Collections
* @method
* @alias forEachOf
* @category Collection
* @see [async.each]{@link module:Collections.each}
* @param {Array|Iterable|Object} coll - A collection to iterate over.
* @param {Function} iteratee - A function to apply to each
* item in `coll`. The `key` is the item's key, or index in the case of an
* array. The iteratee is passed a `callback(err)` which must be called once it
* has completed. If no error has occurred, the callback should be run without
* arguments or with an explicit `null` argument. Invoked with
* (item, key, callback).
* @param {Function} [callback] - A callback which is called when all
* `iteratee` functions have finished, or an error occurs. Invoked with (err).
* @example
*
* var obj = {dev: "/dev.json", test: "/test.json", prod: "/prod.json"};
* var configs = {};
*
* async.forEachOf(obj, function (value, key, callback) {
* fs.readFile(__dirname + value, "utf8", function (err, data) {
* if (err) return callback(err);
* try {
* configs[key] = JSON.parse(data);
* } catch (e) {
* return callback(e);
* }
* callback();
* });
* }, function (err) {
* if (err) console.error(err.message);
* // configs is now a map of JSON data
* doSomethingWith(configs);
* });
*/
function eachOf (coll, iteratee, callback) {
var eachOfImplementation = isArrayLike(coll) ? eachOfArrayLike : eachOfGeneric;
eachOfImplementation(coll, iteratee, callback);
}
function doParallel(fn) {
return function (obj, iteratee, callback) {
return fn(eachOf, obj, iteratee, callback);
};
}
function _asyncMap(eachfn, arr, iteratee, callback) {
callback = once(callback || noop);
arr = arr || [];
var results = [];
var counter = 0;
eachfn(arr, function (value, _, callback) {
var index = counter++;
iteratee(value, function (err, v) {
results[index] = v;
callback(err);
});
}, function (err) {
callback(err, results);
});
}
/**
* Produces a new collection of values by mapping each value in `coll` through
* the `iteratee` function. The `iteratee` is called with an item from `coll`
* and a callback for when it has finished processing. Each of these callback
* takes 2 arguments: an `error`, and the transformed item from `coll`. If
* `iteratee` passes an error to its callback, the main `callback` (for the
* `map` function) is immediately called with the error.
*
* Note, that since this function applies the `iteratee` to each item in
* parallel, there is no guarantee that the `iteratee` functions will complete
* in order. However, the results array will be in the same order as the
* original `coll`.
*
* If `map` is passed an Object, the results will be an Array. The results
* will roughly be in the order of the original Objects' keys (but this can
* vary across JavaScript engines)
*
* @name map
* @static
* @memberOf module:Collections
* @method
* @category Collection
* @param {Array|Iterable|Object} coll - A collection to iterate over.
* @param {Function} iteratee - A function to apply to each item in `coll`.
* The iteratee is passed a `callback(err, transformed)` which must be called
* once it has completed with an error (which can be `null`) and a
* transformed item. Invoked with (item, callback).
* @param {Function} [callback] - A callback which is called when all `iteratee`
* functions have finished, or an error occurs. Results is an Array of the
* transformed items from the `coll`. Invoked with (err, results).
* @example
*
* async.map(['file1','file2','file3'], fs.stat, function(err, results) {
* // results is now an array of stats for each file
* });
*/
var map = doParallel(_asyncMap);
/**
* Applies the provided arguments to each function in the array, calling
* `callback` after all functions have completed. If you only provide the first
* argument, then it will return a function which lets you pass in the
* arguments as if it were a single function call.
*
* @name applyEach
* @static
* @memberOf module:ControlFlow
* @method
* @category Control Flow
* @param {Array|Iterable|Object} fns - A collection of asynchronous functions to all
* call with the same arguments
* @param {...*} [args] - any number of separate arguments to pass to the
* function.
* @param {Function} [callback] - the final argument should be the callback,
* called when all functions have completed processing.
* @returns {Function} - If only the first argument is provided, it will return
* a function which lets you pass in the arguments as if it were a single
* function call.
* @example
*
* async.applyEach([enableSearch, updateSchema], 'bucket', callback);
*
* // partial application example:
* async.each(
* buckets,
* async.applyEach([enableSearch, updateSchema]),
* callback
* );
*/
var applyEach = applyEach$1(map);
function doParallelLimit(fn) {
return function (obj, limit, iteratee, callback) {
return fn(_eachOfLimit(limit), obj, iteratee, callback);
};
}
/**
* The same as [`map`]{@link module:Collections.map} but runs a maximum of `limit` async operations at a time.
*
* @name mapLimit
* @static
* @memberOf module:Collections
* @method
* @see [async.map]{@link module:Collections.map}
* @category Collection
* @param {Array|Iterable|Object} coll - A collection to iterate over.
* @param {number} limit - The maximum number of async operations at a time.
* @param {Function} iteratee - A function to apply to each item in `coll`.
* The iteratee is passed a `callback(err, transformed)` which must be called
* once it has completed with an error (which can be `null`) and a transformed
* item. Invoked with (item, callback).
* @param {Function} [callback] - A callback which is called when all `iteratee`
* functions have finished, or an error occurs. Results is an array of the
* transformed items from the `coll`. Invoked with (err, results).
*/
var mapLimit = doParallelLimit(_asyncMap);
/**
* The same as [`map`]{@link module:Collections.map} but runs only a single async operation at a time.
*
* @name mapSeries
* @static
* @memberOf module:Collections
* @method
* @see [async.map]{@link module:Collections.map}
* @category Collection
* @param {Array|Iterable|Object} coll - A collection to iterate over.
* @param {Function} iteratee - A function to apply to each item in `coll`.
* The iteratee is passed a `callback(err, transformed)` which must be called
* once it has completed with an error (which can be `null`) and a
* transformed item. Invoked with (item, callback).
* @param {Function} [callback] - A callback which is called when all `iteratee`
* functions have finished, or an error occurs. Results is an array of the
* transformed items from the `coll`. Invoked with (err, results).
*/
var mapSeries = doLimit(mapLimit, 1);
/**
* The same as [`applyEach`]{@link module:ControlFlow.applyEach} but runs only a single async operation at a time.
*
* @name applyEachSeries
* @static
* @memberOf module:ControlFlow
* @method
* @see [async.applyEach]{@link module:ControlFlow.applyEach}
* @category Control Flow
* @param {Array|Iterable|Object} fns - A collection of asynchronous functions to all
* call with the same arguments
* @param {...*} [args] - any number of separate arguments to pass to the
* function.
* @param {Function} [callback] - the final argument should be the callback,
* called when all functions have completed processing.
* @returns {Function} - If only the first argument is provided, it will return
* a function which lets you pass in the arguments as if it were a single
* function call.
*/
var applyEachSeries = applyEach$1(mapSeries);
/**
* Creates a continuation function with some arguments already applied.
*
* Useful as a shorthand when combined with other control flow functions. Any
* arguments passed to the returned function are added to the arguments
* originally passed to apply.
*
* @name apply
* @static
* @memberOf module:Utils
* @method
* @category Util
* @param {Function} function - The function you want to eventually apply all
* arguments to. Invokes with (arguments...).
* @param {...*} arguments... - Any number of arguments to automatically apply
* when the continuation is called.
* @example
*
* // using apply
* async.parallel([
* async.apply(fs.writeFile, 'testfile1', 'test1'),
* async.apply(fs.writeFile, 'testfile2', 'test2')
* ]);
*
*
* // the same process without using apply
* async.parallel([
* function(callback) {
* fs.writeFile('testfile1', 'test1', callback);
* },
* function(callback) {
* fs.writeFile('testfile2', 'test2', callback);
* }
* ]);
*
* // It's possible to pass any number of additional arguments when calling the
* // continuation:
*
* node> var fn = async.apply(sys.puts, 'one');
* node> fn('two', 'three');
* one
* two
* three
*/
var apply$1 = rest(function (fn, args) {
return rest(function (callArgs) {
return fn.apply(null, args.concat(callArgs));
});
});
/**
* Take a sync function and make it async, passing its return value to a
* callback. This is useful for plugging sync functions into a waterfall,
* series, or other async functions. Any arguments passed to the generated
* function will be passed to the wrapped function (except for the final
* callback argument). Errors thrown will be passed to the callback.
*
* If the function passed to `asyncify` returns a Promise, that promises's
* resolved/rejected state will be used to call the callback, rather than simply
* the synchronous return value.
*
* This also means you can asyncify ES2016 `async` functions.
*
* @name asyncify
* @static
* @memberOf module:Utils
* @method
* @alias wrapSync
* @category Util
* @param {Function} func - The synchronous function to convert to an
* asynchronous function.
* @returns {Function} An asynchronous wrapper of the `func`. To be invoked with
* (callback).
* @example
*
* // passing a regular synchronous function
* async.waterfall([
* async.apply(fs.readFile, filename, "utf8"),
* async.asyncify(JSON.parse),
* function (data, next) {
* // data is the result of parsing the text.
* // If there was a parsing error, it would have been caught.
* }
* ], callback);
*
* // passing a function returning a promise
* async.waterfall([
* async.apply(fs.readFile, filename, "utf8"),
* async.asyncify(function (contents) {
* return db.model.create(contents);
* }),
* function (model, next) {
* // `model` is the instantiated model object.
* // If there was an error, this function would be skipped.
* }
* ], callback);
*
* // es6 example
* var q = async.queue(async.asyncify(async function(file) {
* var intermediateStep = await processFile(file);
* return await somePromise(intermediateStep)
* }));
*
* q.push(files);
*/
function asyncify(func) {
return initialParams(function (args, callback) {
var result;
try {
result = func.apply(this, args);
} catch (e) {
return callback(e);
}
// if result is Promise object
if (isObject(result) && typeof result.then === 'function') {
result.then(function (value) {
callback(null, value);
}, function (err) {
callback(err.message ? err : new Error(err));
});
} else {
callback(null, result);
}
});
}
/**
* A specialized version of `_.forEach` for arrays without support for
* iteratee shorthands.
*
* @private
* @param {Array} [array] The array to iterate over.
* @param {Function} iteratee The function invoked per iteration.
* @returns {Array} Returns `array`.
*/
function arrayEach(array, iteratee) {
var index = -1,
length = array ? array.length : 0;
while (++index < length) {
if (iteratee(array[index], index, array) === false) {
break;
}
}
return array;
}
/**
* Creates a base function for methods like `_.forIn` and `_.forOwn`.
*
* @private
* @param {boolean} [fromRight] Specify iterating from right to left.
* @returns {Function} Returns the new base function.
*/
function createBaseFor(fromRight) {
return function(object, iteratee, keysFunc) {
var index = -1,
iterable = Object(object),
props = keysFunc(object),
length = props.length;
while (length--) {
var key = props[fromRight ? length : ++index];
if (iteratee(iterable[key], key, iterable) === false) {
break;
}
}
return object;
};
}
/**
* The base implementation of `baseForOwn` which iterates over `object`
* properties returned by `keysFunc` and invokes `iteratee` for each property.
* Iteratee functions may exit iteration early by explicitly returning `false`.
*
* @private
* @param {Object} object The object to iterate over.
* @param {Function} iteratee The function invoked per iteration.
* @param {Function} keysFunc The function to get the keys of `object`.
* @returns {Object} Returns `object`.
*/
var baseFor = createBaseFor();
/**
* The base implementation of `_.forOwn` without support for iteratee shorthands.
*
* @private
* @param {Object} object The object to iterate over.
* @param {Function} iteratee The function invoked per iteration.
* @returns {Object} Returns `object`.
*/
function baseForOwn(object, iteratee) {
return object && baseFor(object, iteratee, keys);
}
/**
* Gets the index at which the first occurrence of `NaN` is found in `array`.
*
* @private
* @param {Array} array The array to search.
* @param {number} fromIndex The index to search from.
* @param {boolean} [fromRight] Specify iterating from right to left.
* @returns {number} Returns the index of the matched `NaN`, else `-1`.
*/
function indexOfNaN(array, fromIndex, fromRight) {
var length = array.length,
index = fromIndex + (fromRight ? 1 : -1);
while ((fromRight ? index-- : ++index < length)) {
var other = array[index];
if (other !== other) {
return index;
}
}
return -1;
}
/**
* The base implementation of `_.indexOf` without `fromIndex` bounds checks.
*
* @private
* @param {Array} array The array to search.
* @param {*} value The value to search for.
* @param {number} fromIndex The index to search from.
* @returns {number} Returns the index of the matched value, else `-1`.
*/
function baseIndexOf(array, value, fromIndex) {
if (value !== value) {
return indexOfNaN(array, fromIndex);
}
var index = fromIndex - 1,
length = array.length;
while (++index < length) {
if (array[index] === value) {
return index;
}
}
return -1;
}
/**
* Determines the best order for running the functions in `tasks`, based on
* their requirements. Each function can optionally depend on other functions
* being completed first, and each function is run as soon as its requirements
* are satisfied.
*
* If any of the functions pass an error to their callback, the `auto` sequence
* will stop. Further tasks will not execute (so any other functions depending
* on it will not run), and the main `callback` is immediately called with the
* error.
*
* Functions also receive an object containing the results of functions which
* have completed so far as the first argument, if they have dependencies. If a
* task function has no dependencies, it will only be passed a callback.
*
* @name auto
* @static
* @memberOf module:ControlFlow
* @method
* @category Control Flow
* @param {Object} tasks - An object. Each of its properties is either a
* function or an array of requirements, with the function itself the last item
* in the array. The object's key of a property serves as the name of the task
* defined by that property, i.e. can be used when specifying requirements for
* other tasks. The function receives one or two arguments:
* * a `results` object, containing the results of the previously executed
* functions, only passed if the task has any dependencies,
* * a `callback(err, result)` function, which must be called when finished,
* passing an `error` (which can be `null`) and the result of the function's
* execution.
* @param {number} [concurrency=Infinity] - An optional `integer` for
* determining the maximum number of tasks that can be run in parallel. By
* default, as many as possible.
* @param {Function} [callback] - An optional callback which is called when all
* the tasks have been completed. It receives the `err` argument if any `tasks`
* pass an error to their callback. Results are always returned; however, if an
* error occurs, no further `tasks` will be performed, and the results object
* will only contain partial results. Invoked with (err, results).
* @returns undefined
* @example
*
* async.auto({
* // this function will just be passed a callback
* readData: async.apply(fs.readFile, 'data.txt', 'utf-8'),
* showData: ['readData', function(results, cb) {
* // results.readData is the file's contents
* // ...
* }]
* }, callback);
*
* async.auto({
* get_data: function(callback) {
* console.log('in get_data');
* // async code to get some data
* callback(null, 'data', 'converted to array');
* },
* make_folder: function(callback) {
* console.log('in make_folder');
* // async code to create a directory to store a file in
* // this is run at the same time as getting the data
* callback(null, 'folder');
* },
* write_file: ['get_data', 'make_folder', function(results, callback) {
* console.log('in write_file', JSON.stringify(results));
* // once there is some data and the directory exists,
* // write the data to a file in the directory
* callback(null, 'filename');
* }],
* email_link: ['write_file', function(results, callback) {
* console.log('in email_link', JSON.stringify(results));
* // once the file is written let's email a link to it...
* // results.write_file contains the filename returned by write_file.
* callback(null, {'file':results.write_file, 'email':'user@example.com'});
* }]
* }, function(err, results) {
* console.log('err = ', err);
* console.log('results = ', results);
* });
*/
function auto (tasks, concurrency, callback) {
if (typeof concurrency === 'function') {
// concurrency is optional, shift the args.
callback = concurrency;
concurrency = null;
}
callback = once(callback || noop);
var keys$$ = keys(tasks);
var numTasks = keys$$.length;
if (!numTasks) {
return callback(null);
}
if (!concurrency) {
concurrency = numTasks;
}
var results = {};
var runningTasks = 0;
var hasError = false;
var listeners = {};
var readyTasks = [];
// for cycle detection:
var readyToCheck = []; // tasks that have been identified as reachable
// without the possibility of returning to an ancestor task
var uncheckedDependencies = {};
baseForOwn(tasks, function (task, key) {
if (!isArray(task)) {
// no dependencies
enqueueTask(key, [task]);
readyToCheck.push(key);
return;
}
var dependencies = task.slice(0, task.length - 1);
var remainingDependencies = dependencies.length;
if (remainingDependencies === 0) {
enqueueTask(key, task);
readyToCheck.push(key);
return;
}
uncheckedDependencies[key] = remainingDependencies;
arrayEach(dependencies, function (dependencyName) {
if (!tasks[dependencyName]) {
throw new Error('async.auto task `' + key + '` has a non-existent dependency in ' + dependencies.join(', '));
}
addListener(dependencyName, function () {
remainingDependencies--;
if (remainingDependencies === 0) {
enqueueTask(key, task);
}
});
});
});
checkForDeadlocks();
processQueue();
function enqueueTask(key, task) {
readyTasks.push(function () {
runTask(key, task);
});
}
function processQueue() {
if (readyTasks.length === 0 && runningTasks === 0) {
return callback(null, results);
}
while (readyTasks.length && runningTasks < concurrency) {
var run = readyTasks.shift();
run();
}
}
function addListener(taskName, fn) {
var taskListeners = listeners[taskName];
if (!taskListeners) {
taskListeners = listeners[taskName] = [];
}
taskListeners.push(fn);
}
function taskComplete(taskName) {
var taskListeners = listeners[taskName] || [];
arrayEach(taskListeners, function (fn) {
fn();
});
processQueue();
}
function runTask(key, task) {
if (hasError) return;
var taskCallback = onlyOnce(rest(function (err, args) {
runningTasks--;
if (args.length <= 1) {
args = args[0];
}
if (err) {
var safeResults = {};
baseForOwn(results, function (val, rkey) {
safeResults[rkey] = val;
});
safeResults[key] = args;
hasError = true;
listeners = [];
callback(err, safeResults);
} else {
results[key] = args;
taskComplete(key);
}
}));
runningTasks++;
var taskFn = task[task.length - 1];
if (task.length > 1) {
taskFn(results, taskCallback);
} else {
taskFn(taskCallback);
}
}
function checkForDeadlocks() {
// Kahn's algorithm
// https://en.wikipedia.org/wiki/Topological_sorting#Kahn.27s_algorithm
// http://connalle.blogspot.com/2013/10/topological-sortingkahn-algorithm.html
var currentTask;
var counter = 0;
while (readyToCheck.length) {
currentTask = readyToCheck.pop();
counter++;
arrayEach(getDependents(currentTask), function (dependent) {
if (--uncheckedDependencies[dependent] === 0) {
readyToCheck.push(dependent);
}
});
}
if (counter !== numTasks) {
throw new Error('async.auto cannot execute tasks due to a recursive dependency');
}
}
function getDependents(taskName) {
var result = [];
baseForOwn(tasks, function (task, key) {
if (isArray(task) && baseIndexOf(task, taskName, 0) >= 0) {
result.push(key);
}
});
return result;
}
}
/**
* A specialized version of `_.map` for arrays without support for iteratee
* shorthands.
*
* @private
* @param {Array} [array] The array to iterate over.
* @param {Function} iteratee The function invoked per iteration.
* @returns {Array} Returns the new mapped array.
*/
function arrayMap(array, iteratee) {
var index = -1,
length = array ? array.length : 0,
result = Array(length);
while (++index < length) {
result[index] = iteratee(array[index], index, array);
}
return result;
}
/**
* Copies the values of `source` to `array`.
*
* @private
* @param {Array} source The array to copy values from.
* @param {Array} [array=[]] The array to copy values to.
* @returns {Array} Returns `array`.
*/
function copyArray(source, array) {
var index = -1,
length = source.length;
array || (array = Array(length));
while (++index < length) {
array[index] = source[index];
}
return array;
}
/**
* Checks if `value` is a global object.
*
* @private
* @param {*} value The value to check.
* @returns {null|Object} Returns `value` if it's a global object, else `null`.
*/
function checkGlobal(value) {
return (value && value.Object === Object) ? value : null;
}
/** Detect free variable `global` from Node.js. */
var freeGlobal = checkGlobal(typeof global == 'object' && global);
/** Detect free variable `self`. */
var freeSelf = checkGlobal(typeof self == 'object' && self);
/** Detect `this` as the global object. */
var thisGlobal = checkGlobal(typeof this == 'object' && this);
/** Used as a reference to the global object. */
var root = freeGlobal || freeSelf || thisGlobal || Function('return this')();
/** Built-in value references. */
var Symbol$1 = root.Symbol;
/** Used as references for various `Number` constants. */
var INFINITY$1 = 1 / 0;
/** Used to convert symbols to primitives and strings. */
var symbolProto = Symbol$1 ? Symbol$1.prototype : undefined;
var symbolToString = symbolProto ? symbolProto.toString : undefined;
/**
* The base implementation of `_.toString` which doesn't convert nullish
* values to empty strings.
*
* @private
* @param {*} value The value to process.
* @returns {string} Returns the string.
*/
function baseToString(value) {
// Exit early for strings to avoid a performance hit in some environments.
if (typeof value == 'string') {
return value;
}
if (isSymbol(value)) {
return symbolToString ? symbolToString.call(value) : '';
}
var result = (value + '');
return (result == '0' && (1 / value) == -INFINITY$1) ? '-0' : result;
}
/**
* The base implementation of `_.slice` without an iteratee call guard.
*
* @private
* @param {Array} array The array to slice.
* @param {number} [start=0] The start position.
* @param {number} [end=array.length] The end position.
* @returns {Array} Returns the slice of `array`.
*/
function baseSlice(array, start, end) {
var index = -1,
length = array.length;
if (start < 0) {
start = -start > length ? 0 : (length + start);
}
end = end > length ? length : end;
if (end < 0) {
end += length;
}
length = start > end ? 0 : ((end - start) >>> 0);
start >>>= 0;
var result = Array(length);
while (++index < length) {
result[index] = array[index + start];
}
return result;
}
/**
* Casts `array` to a slice if it's needed.
*
* @private
* @param {Array} array The array to inspect.
* @param {number} start The start position.
* @param {number} [end=array.length] The end position.
* @returns {Array} Returns the cast slice.
*/
function castSlice(array, start, end) {
var length = array.length;
end = end === undefined ? length : end;
return (!start && end >= length) ? array : baseSlice(array, start, end);
}
/**
* Used by `_.trim` and `_.trimEnd` to get the index of the last string symbol
* that is not found in the character symbols.
*
* @private
* @param {Array} strSymbols The string symbols to inspect.
* @param {Array} chrSymbols The character symbols to find.
* @returns {number} Returns the index of the last unmatched string symbol.
*/
function charsEndIndex(strSymbols, chrSymbols) {
var index = strSymbols.length;
while (index-- && baseIndexOf(chrSymbols, strSymbols[index], 0) > -1) {}
return index;
}
/**
* Used by `_.trim` and `_.trimStart` to get the index of the first string symbol
* that is not found in the character symbols.
*
* @private
* @param {Array} strSymbols The string symbols to inspect.
* @param {Array} chrSymbols The character symbols to find.
* @returns {number} Returns the index of the first unmatched string symbol.
*/
function charsStartIndex(strSymbols, chrSymbols) {
var index = -1,
length = strSymbols.length;
while (++index < length && baseIndexOf(chrSymbols, strSymbols[index], 0) > -1) {}
return index;
}
/** Used to compose unicode character classes. */
var rsAstralRange = '\\ud800-\\udfff';
var rsComboMarksRange = '\\u0300-\\u036f\\ufe20-\\ufe23';
var rsComboSymbolsRange = '\\u20d0-\\u20f0';
var rsVarRange = '\\ufe0e\\ufe0f';
var rsAstral = '[' + rsAstralRange + ']';
var rsCombo = '[' + rsComboMarksRange + rsComboSymbolsRange + ']';
var rsFitz = '\\ud83c[\\udffb-\\udfff]';
var rsModifier = '(?:' + rsCombo + '|' + rsFitz + ')';
var rsNonAstral = '[^' + rsAstralRange + ']';
var rsRegional = '(?:\\ud83c[\\udde6-\\uddff]){2}';
var rsSurrPair = '[\\ud800-\\udbff][\\udc00-\\udfff]';
var rsZWJ = '\\u200d';
var reOptMod = rsModifier + '?';
var rsOptVar = '[' + rsVarRange + ']?';
var rsOptJoin = '(?:' + rsZWJ + '(?:' + [rsNonAstral, rsRegional, rsSurrPair].join('|') + ')' + rsOptVar + reOptMod + ')*';
var rsSeq = rsOptVar + reOptMod + rsOptJoin;
var rsSymbol = '(?:' + [rsNonAstral + rsCombo + '?', rsCombo, rsRegional, rsSurrPair, rsAstral].join('|') + ')';
/** Used to match [string symbols](https://mathiasbynens.be/notes/javascript-unicode). */
var reComplexSymbol = RegExp(rsFitz + '(?=' + rsFitz + ')|' + rsSymbol + rsSeq, 'g');
/**
* Converts `string` to an array.
*
* @private
* @param {string} string The string to convert.
* @returns {Array} Returns the converted array.
*/
function stringToArray(string) {
return string.match(reComplexSymbol);
}
/**
* Converts `value` to a string. An empty string is returned for `null`
* and `undefined` values. The sign of `-0` is preserved.
*
* @static
* @memberOf _
* @since 4.0.0
* @category Lang
* @param {*} value The value to process.
* @returns {string} Returns the string.
* @example
*
* _.toString(null);
* // => ''
*
* _.toString(-0);
* // => '-0'
*
* _.toString([1, 2, 3]);
* // => '1,2,3'
*/
function toString(value) {
return value == null ? '' : baseToString(value);
}
/** Used to match leading and trailing whitespace. */
var reTrim$1 = /^\s+|\s+$/g;
/**
* Removes leading and trailing whitespace or specified characters from `string`.
*
* @static
* @memberOf _
* @since 3.0.0
* @category String
* @param {string} [string=''] The string to trim.
* @param {string} [chars=whitespace] The characters to trim.
* @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
* @returns {string} Returns the trimmed string.
* @example
*
* _.trim(' abc ');
* // => 'abc'
*
* _.trim('-_-abc-_-', '_-');
* // => 'abc'
*
* _.map([' foo ', ' bar '], _.trim);
* // => ['foo', 'bar']
*/
function trim(string, chars, guard) {
string = toString(string);
if (string && (guard || chars === undefined)) {
return string.replace(reTrim$1, '');
}
if (!string || !(chars = baseToString(chars))) {
return string;
}
var strSymbols = stringToArray(string),
chrSymbols = stringToArray(chars),
start = charsStartIndex(strSymbols, chrSymbols),
end = charsEndIndex(strSymbols, chrSymbols) + 1;
return castSlice(strSymbols, start, end).join('');
}
var FN_ARGS = /^(function)?\s*[^\(]*\(\s*([^\)]*)\)/m;
var FN_ARG_SPLIT = /,/;
var FN_ARG = /(=.+)?(\s*)$/;
var STRIP_COMMENTS = /((\/\/.*$)|(\/\*[\s\S]*?\*\/))/mg;
function parseParams(func) {
func = func.toString().replace(STRIP_COMMENTS, '');
func = func.match(FN_ARGS)[2].replace(' ', '');
func = func ? func.split(FN_ARG_SPLIT) : [];
func = func.map(function (arg) {
return trim(arg.replace(FN_ARG, ''));
});
return func;
}
/**
* A dependency-injected version of the [async.auto]{@link module:ControlFlow.auto} function. Dependent
* tasks are specified as parameters to the function, after the usual callback
* parameter, with the parameter names matching the names of the tasks it
* depends on. This can provide even more readable task graphs which can be
* easier to maintain.
*
* If a final callback is specified, the task results are similarly injected,
* specified as named parameters after the initial error parameter.
*
* The autoInject function is purely syntactic sugar and its semantics are
* otherwise equivalent to [async.auto]{@link module:ControlFlow.auto}.
*
* @name autoInject
* @static
* @memberOf module:ControlFlow
* @method
* @see [async.auto]{@link module:ControlFlow.auto}
* @category Control Flow
* @param {Object} tasks - An object, each of whose properties is a function of
* the form 'func([dependencies...], callback). The object's key of a property
* serves as the name of the task defined by that property, i.e. can be used
* when specifying requirements for other tasks.
* * The `callback` parameter is a `callback(err, result)` which must be called
* when finished, passing an `error` (which can be `null`) and the result of
* the function's execution. The remaining parameters name other tasks on
* which the task is dependent, and the results from those tasks are the
* arguments of those parameters.
* @param {Function} [callback] - An optional callback which is called when all
* the tasks have been completed. It receives the `err` argument if any `tasks`
* pass an error to their callback, and a `results` object with any completed
* task results, similar to `auto`.
* @example
*
* // The example from `auto` can be rewritten as follows:
* async.autoInject({
* get_data: function(callback) {
* // async code to get some data
* callback(null, 'data', 'converted to array');
* },
* make_folder: function(callback) {
* // async code to create a directory to store a file in
* // this is run at the same time as getting the data
* callback(null, 'folder');
* },
* write_file: function(get_data, make_folder, callback) {
* // once there is some data and the directory exists,
* // write the data to a file in the directory
* callback(null, 'filename');
* },
* email_link: function(write_file, callback) {
* // once the file is written let's email a link to it...
* // write_file contains the filename returned by write_file.
* callback(null, {'file':write_file, 'email':'user@example.com'});
* }
* }, function(err, results) {
* console.log('err = ', err);
* console.log('email_link = ', results.email_link);
* });
*
* // If you are using a JS minifier that mangles parameter names, `autoInject`
* // will not work with plain functions, since the parameter names will be
* // collapsed to a single letter identifier. To work around this, you can
* // explicitly specify the names of the parameters your task function needs
* // in an array, similar to Angular.js dependency injection.
*
* // This still has an advantage over plain `auto`, since the results a task
* // depends on are still spread into arguments.
* async.autoInject({
* //...
* write_file: ['get_data', 'make_folder', function(get_data, make_folder, callback) {
* callback(null, 'filename');
* }],
* email_link: ['write_file', function(write_file, callback) {
* callback(null, {'file':write_file, 'email':'user@example.com'});
* }]
* //...
* }, function(err, results) {
* console.log('err = ', err);
* console.log('email_link = ', results.email_link);
* });
*/
function autoInject(tasks, callback) {
var newTasks = {};
baseForOwn(tasks, function (taskFn, key) {
var params;
if (isArray(taskFn)) {
params = copyArray(taskFn);
taskFn = params.pop();
newTasks[key] = params.concat(params.length > 0 ? newTask : taskFn);
} else if (taskFn.length === 1) {
// no dependencies, use the function as-is
newTasks[key] = taskFn;
} else {
params = parseParams(taskFn);
if (taskFn.length === 0 && params.length === 0) {
throw new Error("autoInject task functions require explicit parameters.");
}
params.pop();
newTasks[key] = params.concat(newTask);
}
function newTask(results, taskCb) {
var newArgs = arrayMap(params, function (name) {
return results[name];
});
newArgs.push(taskCb);
taskFn.apply(null, newArgs);
}
});
auto(newTasks, callback);
}
var hasSetImmediate = typeof setImmediate === 'function' && setImmediate;
var hasNextTick = typeof process === 'object' && typeof process.nextTick === 'function';
function fallback(fn) {
setTimeout(fn, 0);
}
function wrap(defer) {
return rest(function (fn, args) {
defer(function () {
fn.apply(null, args);
});
});
}
var _defer;
if (hasSetImmediate) {
_defer = setImmediate;
} else if (hasNextTick) {
_defer = process.nextTick;
} else {
_defer = fallback;
}
var setImmediate$1 = wrap(_defer);
// Simple doubly linked list (https://en.wikipedia.org/wiki/Doubly_linked_list) implementation
// used for queues. This implementation assumes that the node provided by the user can be modified
// to adjust the next and last properties. We implement only the minimal functionality
// for queue support.
function DLL() {
this.head = this.tail = null;
this.length = 0;
}
function setInitial(dll, node) {
dll.length = 1;
dll.head = dll.tail = node;
}
DLL.prototype.removeLink = function (node) {
if (node.prev) node.prev.next = node.next;else this.head = node.next;
if (node.next) node.next.prev = node.prev;else this.tail = node.prev;
node.prev = node.next = null;
this.length -= 1;
return node;
};
DLL.prototype.empty = DLL;
DLL.prototype.insertAfter = function (node, newNode) {
newNode.prev = node;
newNode.next = node.next;
if (node.next) node.next.prev = newNode;else this.tail = newNode;
node.next = newNode;
this.length += 1;
};
DLL.prototype.insertBefore = function (node, newNode) {
newNode.prev = node.prev;
newNode.next = node;
if (node.prev) node.prev.next = newNode;else this.head = newNode;
node.prev = newNode;
this.length += 1;
};
DLL.prototype.unshift = function (node) {
if (this.head) this.insertBefore(this.head, node);else setInitial(this, node);
};
DLL.prototype.push = function (node) {
if (this.tail) this.insertAfter(this.tail, node);else setInitial(this, node);
};
DLL.prototype.shift = function () {
return this.head && this.removeLink(this.head);
};
DLL.prototype.pop = function () {
return this.tail && this.removeLink(this.tail);
};
function queue(worker, concurrency, payload) {
if (concurrency == null) {
concurrency = 1;
} else if (concurrency === 0) {
throw new Error('Concurrency must not be zero');
}
function _insert(data, insertAtFront, callback) {
if (callback != null && typeof callback !== 'function') {
throw new Error('task callback must be a function');
}
q.started = true;
if (!isArray(data)) {
data = [data];
}
if (data.length === 0 && q.idle()) {
// call drain immediately if there are no tasks
return setImmediate$1(function () {
q.drain();
});
}
arrayEach(data, function (task) {
var item = {
data: task,
callback: callback || noop
};
if (insertAtFront) {
q._tasks.unshift(item);
} else {
q._tasks.push(item);
}
});
setImmediate$1(q.process);
}
function _next(tasks) {
return rest(function (args) {
workers -= 1;
arrayEach(tasks, function (task) {
arrayEach(workersList, function (worker, index) {
if (worker === task) {
workersList.splice(index, 1);
return false;
}
});
task.callback.apply(task, args);
if (args[0] != null) {
q.error(args[0], task.data);
}
});
if (workers <= q.concurrency - q.buffer) {
q.unsaturated();
}
if (q.idle()) {
q.drain();
}
q.process();
});
}
var workers = 0;
var workersList = [];
var q = {
_tasks: new DLL(),
concurrency: concurrency,
payload: payload,
saturated: noop,
unsaturated: noop,
buffer: concurrency / 4,
empty: noop,
drain: noop,
error: noop,
started: false,
paused: false,
push: function (data, callback) {
_insert(data, false, callback);
},
kill: function () {
q.drain = noop;
q._tasks.empty();
},
unshift: function (data, callback) {
_insert(data, true, callback);
},
process: function () {
while (!q.paused && workers < q.concurrency && q._tasks.length) {
var tasks = [],
data = [];
var l = q._tasks.length;
if (q.payload) l = Math.min(l, q.payload);
for (var i = 0; i < l; i++) {
var node = q._tasks.shift();
tasks.push(node);
data.push(node.data);
}
if (q._tasks.length === 0) {
q.empty();
}
workers += 1;
workersList.push(tasks[0]);
if (workers === q.concurrency) {
q.saturated();
}
var cb = onlyOnce(_next(tasks));
worker(data, cb);
}
},
length: function () {
return q._tasks.length;
},
running: function () {
return workers;
},
workersList: function () {
return workersList;
},
idle: function () {
return q._tasks.length + workers === 0;
},
pause: function () {
q.paused = true;
},
resume: function () {
if (q.paused === false) {
return;
}
q.paused = false;
var resumeCount = Math.min(q.concurrency, q._tasks.length);
// Need to call q.process once per concurrent
// worker to preserve full concurrency after pause
for (var w = 1; w <= resumeCount; w++) {
setImmediate$1(q.process);
}
}
};
return q;
}
/**
* A cargo of tasks for the worker function to complete. Cargo inherits all of
* the same methods and event callbacks as [`queue`]{@link module:ControlFlow.queue}.
* @typedef {Object} CargoObject
* @memberOf module:ControlFlow
* @property {Function} length - A function returning the number of items
* waiting to be processed. Invoke like `cargo.length()`.
* @property {number} payload - An `integer` for determining how many tasks
* should be process per round. This property can be changed after a `cargo` is
* created to alter the payload on-the-fly.
* @property {Function} push - Adds `task` to the `queue`. The callback is
* called once the `worker` has finished processing the task. Instead of a
* single task, an array of `tasks` can be submitted. The respective callback is
* used for every task in the list. Invoke like `cargo.push(task, [callback])`.
* @property {Function} saturated - A callback that is called when the
* `queue.length()` hits the concurrency and further tasks will be queued.
* @property {Function} empty - A callback that is called when the last item
* from the `queue` is given to a `worker`.
* @property {Function} drain - A callback that is called when the last item
* from the `queue` has returned from the `worker`.
* @property {Function} idle - a function returning false if there are items
* waiting or being processed, or true if not. Invoke like `cargo.idle()`.
* @property {Function} pause - a function that pauses the processing of tasks
* until `resume()` is called. Invoke like `cargo.pause()`.
* @property {Function} resume - a function that resumes the processing of
* queued tasks when the queue is paused. Invoke like `cargo.resume()`.
* @property {Function} kill - a function that removes the `drain` callback and
* empties remaining tasks from the queue forcing it to go idle. Invoke like `cargo.kill()`.
*/
/**
* Creates a `cargo` object with the specified payload. Tasks added to the
* cargo will be processed altogether (up to the `payload` limit). If the
* `worker` is in progress, the task is queued until it becomes available. Once
* the `worker` has completed some tasks, each callback of those tasks is
* called. Check out [these](https://camo.githubusercontent.com/6bbd36f4cf5b35a0f11a96dcd2e97711ffc2fb37/68747470733a2f2f662e636c6f75642e6769746875622e636f6d2f6173736574732f313637363837312f36383130382f62626330636662302d356632392d313165322d393734662d3333393763363464633835382e676966) [animations](https://camo.githubusercontent.com/f4810e00e1c5f5f8addbe3e9f49064fd5d102699/68747470733a2f2f662e636c6f75642e6769746875622e636f6d2f6173736574732f313637363837312f36383130312f38346339323036362d356632392d313165322d383134662d3964336430323431336266642e676966)
* for how `cargo` and `queue` work.
*
* While [`queue`]{@link module:ControlFlow.queue} passes only one task to one of a group of workers
* at a time, cargo passes an array of tasks to a single worker, repeating
* when the worker is finished.
*
* @name cargo
* @static
* @memberOf module:ControlFlow
* @method
* @see [async.queue]{@link module:ControlFlow.queue}
* @category Control Flow
* @param {Function} worker - An asynchronous function for processing an array
* of queued tasks, which must call its `callback(err)` argument when finished,
* with an optional `err` argument. Invoked with `(tasks, callback)`.
* @param {number} [payload=Infinity] - An optional `integer` for determining
* how many tasks should be processed per round; if omitted, the default is
* unlimited.
* @returns {module:ControlFlow.CargoObject} A cargo object to manage the tasks. Callbacks can
* attached as certain properties to listen for specific events during the
* lifecycle of the cargo and inner queue.
* @example
*
* // create a cargo object with payload 2
* var cargo = async.cargo(function(tasks, callback) {
* for (var i=0; i<tasks.length; i++) {
* console.log('hello ' + tasks[i].name);
* }
* callback();
* }, 2);
*
* // add some items
* cargo.push({name: 'foo'}, function(err) {
* console.log('finished processing foo');
* });
* cargo.push({name: 'bar'}, function(err) {
* console.log('finished processing bar');
* });
* cargo.push({name: 'baz'}, function(err) {
* console.log('finished processing baz');
* });
*/
function cargo(worker, payload) {
return queue(worker, 1, payload);
}
/**
* The same as [`eachOf`]{@link module:Collections.eachOf} but runs only a single async operation at a time.
*
* @name eachOfSeries
* @static
* @memberOf module:Collections
* @method
* @see [async.eachOf]{@link module:Collections.eachOf}
* @alias forEachOfSeries
* @category Collection
* @param {Array|Iterable|Object} coll - A collection to iterate over.
* @param {Function} iteratee - A function to apply to each item in `coll`. The
* `key` is the item's key, or index in the case of an array. The iteratee is
* passed a `callback(err)` which must be called once it has completed. If no
* error has occurred, the callback should be run without arguments or with an
* explicit `null` argument. Invoked with (item, key, callback).
* @param {Function} [callback] - A callback which is called when all `iteratee`
* functions have finished, or an error occurs. Invoked with (err).
*/
var eachOfSeries = doLimit(eachOfLimit, 1);
/**
* Reduces `coll` into a single value using an async `iteratee` to return each
* successive step. `memo` is the initial state of the reduction. This function
* only operates in series.
*
* For performance reasons, it may make sense to split a call to this function
* into a parallel map, and then use the normal `Array.prototype.reduce` on the
* results. This function is for situations where each step in the reduction
* needs to be async; if you can get the data before reducing it, then it's
* probably a good idea to do so.
*
* @name reduce
* @static
* @memberOf module:Collections
* @method
* @alias inject
* @alias foldl
* @category Collection
* @param {Array|Iterable|Object} coll - A collection to iterate over.
* @param {*} memo - The initial state of the reduction.
* @param {Function} iteratee - A function applied to each item in the
* array to produce the next step in the reduction. The `iteratee` is passed a
* `callback(err, reduction)` which accepts an optional error as its first
* argument, and the state of the reduction as the second. If an error is
* passed to the callback, the reduction is stopped and the main `callback` is
* immediately called with the error. Invoked with (memo, item, callback).
* @param {Function} [callback] - A callback which is called after all the
* `iteratee` functions have finished. Result is the reduced value. Invoked with
* (err, result).
* @example
*
* async.reduce([1,2,3], 0, function(memo, item, callback) {
* // pointless async:
* process.nextTick(function() {
* callback(null, memo + item)
* });
* }, function(err, result) {
* // result is now equal to the last value of memo, which is 6
* });
*/
function reduce(coll, memo, iteratee, callback) {
callback = once(callback || noop);
eachOfSeries(coll, function (x, i, callback) {
iteratee(memo, x, function (err, v) {
memo = v;
callback(err);
});
}, function (err) {
callback(err, memo);
});
}
/**
* Version of the compose function that is more natural to read. Each function
* consumes the return value of the previous function. It is the equivalent of
* [compose]{@link module:ControlFlow.compose} with the arguments reversed.
*
* Each function is executed with the `this` binding of the composed function.
*
* @name seq
* @static
* @memberOf module:ControlFlow
* @method
* @see [async.compose]{@link module:ControlFlow.compose}
* @category Control Flow
* @param {...Function} functions - the asynchronous functions to compose
* @returns {Function} a function that composes the `functions` in order
* @example
*
* // Requires lodash (or underscore), express3 and dresende's orm2.
* // Part of an app, that fetches cats of the logged user.
* // This example uses `seq` function to avoid overnesting and error
* // handling clutter.
* app.get('/cats', function(request, response) {
* var User = request.models.User;
* async.seq(
* _.bind(User.get, User), // 'User.get' has signature (id, callback(err, data))
* function(user, fn) {
* user.getCats(fn); // 'getCats' has signature (callback(err, data))
* }
* )(req.session.user_id, function (err, cats) {
* if (err) {
* console.error(err);
* response.json({ status: 'error', message: err.message });
* } else {
* response.json({ status: 'ok', message: 'Cats found', data: cats });
* }
* });
* });
*/
var seq = rest(function seq(functions) {
return rest(function (args) {
var that = this;
var cb = args[args.length - 1];
if (typeof cb == 'function') {
args.pop();
} else {
cb = noop;
}
reduce(functions, args, function (newargs, fn, cb) {
fn.apply(that, newargs.concat([rest(function (err, nextargs) {
cb(err, nextargs);
})]));
}, function (err, results) {
cb.apply(that, [err].concat(results));
});
});
});
/**
* Creates a function which is a composition of the passed asynchronous
* functions. Each function consumes the return value of the function that
* follows. Composing functions `f()`, `g()`, and `h()` would produce the result
* of `f(g(h()))`, only this version uses callbacks to obtain the return values.
*
* Each function is executed with the `this` binding of the composed function.
*
* @name compose
* @static
* @memberOf module:ControlFlow
* @method
* @category Control Flow
* @param {...Function} functions - the asynchronous functions to compose
* @returns {Function} an asynchronous function that is the composed
* asynchronous `functions`
* @example
*
* function add1(n, callback) {
* setTimeout(function () {
* callback(null, n + 1);
* }, 10);
* }
*
* function mul3(n, callback) {
* setTimeout(function () {
* callback(null, n * 3);
* }, 10);
* }
*
* var add1mul3 = async.compose(mul3, add1);
* add1mul3(4, function (err, result) {
* // result now equals 15
* });
*/
var compose = rest(function (args) {
return seq.apply(null, args.reverse());
});
function concat$1(eachfn, arr, fn, callback) {
var result = [];
eachfn(arr, function (x, index, cb) {
fn(x, function (err, y) {
result = result.concat(y || []);
cb(err);
});
}, function (err) {
callback(err, result);
});
}
/**
* Applies `iteratee` to each item in `coll`, concatenating the results. Returns
* the concatenated list. The `iteratee`s are called in parallel, and the
* results are concatenated as they return. There is no guarantee that the
* results array will be returned in the original order of `coll` passed to the
* `iteratee` function.
*
* @name concat
* @static
* @memberOf module:Collections
* @method
* @category Collection
* @param {Array|Iterable|Object} coll - A collection to iterate over.
* @param {Function} iteratee - A function to apply to each item in `coll`.
* The iteratee is passed a `callback(err, results)` which must be called once
* it has completed with an error (which can be `null`) and an array of results.
* Invoked with (item, callback).
* @param {Function} [callback(err)] - A callback which is called after all the
* `iteratee` functions have finished, or an error occurs. Results is an array
* containing the concatenated results of the `iteratee` function. Invoked with
* (err, results).
* @example
*
* async.concat(['dir1','dir2','dir3'], fs.readdir, function(err, files) {
* // files is now a list of filenames that exist in the 3 directories
* });
*/
var concat = doParallel(concat$1);
function doSeries(fn) {
return function (obj, iteratee, callback) {
return fn(eachOfSeries, obj, iteratee, callback);
};
}
/**
* The same as [`concat`]{@link module:Collections.concat} but runs only a single async operation at a time.
*
* @name concatSeries
* @static
* @memberOf module:Collections
* @method
* @see [async.concat]{@link module:Collections.concat}
* @category Collection
* @param {Array|Iterable|Object} coll - A collection to iterate over.
* @param {Function} iteratee - A function to apply to each item in `coll`.
* The iteratee is passed a `callback(err, results)` which must be called once
* it has completed with an error (which can be `null`) and an array of results.
* Invoked with (item, callback).
* @param {Function} [callback(err)] - A callback which is called after all the
* `iteratee` functions have finished, or an error occurs. Results is an array
* containing the concatenated results of the `iteratee` function. Invoked with
* (err, results).
*/
var concatSeries = doSeries(concat$1);
/**
* Returns a function that when called, calls-back with the values provided.
* Useful as the first function in a [`waterfall`]{@link module:ControlFlow.waterfall}, or for plugging values in to
* [`auto`]{@link module:ControlFlow.auto}.
*
* @name constant
* @static
* @memberOf module:Utils
* @method
* @category Util
* @param {...*} arguments... - Any number of arguments to automatically invoke
* callback with.
* @returns {Function} Returns a function that when invoked, automatically
* invokes the callback with the previous given arguments.
* @example
*
* async.waterfall([
* async.constant(42),
* function (value, next) {
* // value === 42
* },
* //...
* ], callback);
*
* async.waterfall([
* async.constant(filename, "utf8"),
* fs.readFile,
* function (fileData, next) {
* //...
* }
* //...
* ], callback);
*
* async.auto({
* hostname: async.constant("https://server.net/"),
* port: findFreePort,
* launchServer: ["hostname", "port", function (options, cb) {
* startServer(options, cb);
* }],
* //...
* }, callback);
*/
var constant = rest(function (values) {
var args = [null].concat(values);
return initialParams(function (ignoredArgs, callback) {
return callback.apply(this, args);
});
});
/**
* This method returns the first argument given to it.
*
* @static
* @since 0.1.0
* @memberOf _
* @category Util
* @param {*} value Any value.
* @returns {*} Returns `value`.
* @example
*
* var object = { 'user': 'fred' };
*
* console.log(_.identity(object) === object);
* // => true
*/
function identity(value) {
return value;
}
function _createTester(eachfn, check, getResult) {
return function (arr, limit, iteratee, cb) {
function done(err) {
if (cb) {
if (err) {
cb(err);
} else {
cb(null, getResult(false));
}
}
}
function wrappedIteratee(x, _, callback) {
if (!cb) return callback();
iteratee(x, function (err, v) {
if (cb) {
if (err) {
cb(err);
cb = iteratee = false;
} else if (check(v)) {
cb(null, getResult(true, x));
cb = iteratee = false;
}
}
callback();
});
}
if (arguments.length > 3) {
cb = cb || noop;
eachfn(arr, limit, wrappedIteratee, done);
} else {
cb = iteratee;
cb = cb || noop;
iteratee = limit;
eachfn(arr, wrappedIteratee, done);
}
};
}
function _findGetResult(v, x) {
return x;
}
/**
* Returns the first value in `coll` that passes an async truth test. The
* `iteratee` is applied in parallel, meaning the first iteratee to return
* `true` will fire the detect `callback` with that result. That means the
* result might not be the first item in the original `coll` (in terms of order)
* that passes the test.
* If order within the original `coll` is important, then look at
* [`detectSeries`]{@link module:Collections.detectSeries}.
*
* @name detect
* @static
* @memberOf module:Collections
* @method
* @alias find
* @category Collections
* @param {Array|Iterable|Object} coll - A collection to iterate over.
* @param {Function} iteratee - A truth test to apply to each item in `coll`.
* The iteratee is passed a `callback(err, truthValue)` which must be called
* with a boolean argument once it has completed. Invoked with (item, callback).
* @param {Function} [callback] - A callback which is called as soon as any
* iteratee returns `true`, or after all the `iteratee` functions have finished.
* Result will be the first item in the array that passes the truth test
* (iteratee) or the value `undefined` if none passed. Invoked with
* (err, result).
* @example
*
* async.detect(['file1','file2','file3'], function(filePath, callback) {
* fs.access(filePath, function(err) {
* callback(null, !err)
* });
* }, function(err, result) {
* // result now equals the first file in the list that exists
* });
*/
var detect = _createTester(eachOf, identity, _findGetResult);
/**
* The same as [`detect`]{@link module:Collections.detect} but runs a maximum of `limit` async operations at a
* time.
*
* @name detectLimit
* @static
* @memberOf module:Collections
* @method
* @see [async.detect]{@link module:Collections.detect}
* @alias findLimit
* @category Collections
* @param {Array|Iterable|Object} coll - A collection to iterate over.
* @param {number} limit - The maximum number of async operations at a time.
* @param {Function} iteratee - A truth test to apply to each item in `coll`.
* The iteratee is passed a `callback(err, truthValue)` which must be called
* with a boolean argument once it has completed. Invoked with (item, callback).
* @param {Function} [callback] - A callback which is called as soon as any
* iteratee returns `true`, or after all the `iteratee` functions have finished.
* Result will be the first item in the array that passes the truth test
* (iteratee) or the value `undefined` if none passed. Invoked with
* (err, result).
*/
var detectLimit = _createTester(eachOfLimit, identity, _findGetResult);
/**
* The same as [`detect`]{@link module:Collections.detect} but runs only a single async operation at a time.
*
* @name detectSeries
* @static
* @memberOf module:Collections
* @method
* @see [async.detect]{@link module:Collections.detect}
* @alias findSeries
* @category Collections
* @param {Array|Iterable|Object} coll - A collection to iterate over.
* @param {Function} iteratee - A truth test to apply to each item in `coll`.
* The iteratee is passed a `callback(err, truthValue)` which must be called
* with a boolean argument once it has completed. Invoked with (item, callback).
* @param {Function} [callback] - A callback which is called as soon as any
* iteratee returns `true`, or after all the `iteratee` functions have finished.
* Result will be the first item in the array that passes the truth test
* (iteratee) or the value `undefined` if none passed. Invoked with
* (err, result).
*/
var detectSeries = _createTester(eachOfSeries, identity, _findGetResult);
function consoleFunc(name) {
return rest(function (fn, args) {
fn.apply(null, args.concat([rest(function (err, args) {
if (typeof console === 'object') {
if (err) {
if (console.error) {
console.error(err);
}
} else if (console[name]) {
arrayEach(args, function (x) {
console[name](x);
});
}
}
})]));
});
}
/**
* Logs the result of an `async` function to the `console` using `console.dir`
* to display the properties of the resulting object. Only works in Node.js or
* in browsers that support `console.dir` and `console.error` (such as FF and
* Chrome). If multiple arguments are returned from the async function,
* `console.dir` is called on each argument in order.
*
* @name dir
* @static
* @memberOf module:Utils
* @method
* @category Util
* @param {Function} function - The function you want to eventually apply all
* arguments to.
* @param {...*} arguments... - Any number of arguments to apply to the function.
* @example
*
* // in a module
* var hello = function(name, callback) {
* setTimeout(function() {
* callback(null, {hello: name});
* }, 1000);
* };
*
* // in the node repl
* node> async.dir(hello, 'world');
* {hello: 'world'}
*/
var dir = consoleFunc('dir');
/**
* The post-check version of [`during`]{@link module:ControlFlow.during}. To reflect the difference in
* the order of operations, the arguments `test` and `fn` are switched.
*
* Also a version of [`doWhilst`]{@link module:ControlFlow.doWhilst} with asynchronous `test` function.
* @name doDuring
* @static
* @memberOf module:ControlFlow
* @method
* @see [async.during]{@link module:ControlFlow.during}
* @category Control Flow
* @param {Function} fn - A function which is called each time `test` passes.
* The function is passed a `callback(err)`, which must be called once it has
* completed with an optional `err` argument. Invoked with (callback).
* @param {Function} test - asynchronous truth test to perform before each
* execution of `fn`. Invoked with (...args, callback), where `...args` are the
* non-error args from the previous callback of `fn`.
* @param {Function} [callback] - A callback which is called after the test
* function has failed and repeated execution of `fn` has stopped. `callback`
* will be passed an error if one occured, otherwise `null`.
*/
function doDuring(fn, test, callback) {
callback = onlyOnce(callback || noop);
var next = rest(function (err, args) {
if (err) return callback(err);
args.push(check);
test.apply(this, args);
});
function check(err, truth) {
if (err) return callback(err);
if (!truth) return callback(null);
fn(next);
}
check(null, true);
}
/**
* The post-check version of [`whilst`]{@link module:ControlFlow.whilst}. To reflect the difference in
* the order of operations, the arguments `test` and `iteratee` are switched.
*
* `doWhilst` is to `whilst` as `do while` is to `while` in plain JavaScript.
*
* @name doWhilst
* @static
* @memberOf module:ControlFlow
* @method
* @see [async.whilst]{@link module:ControlFlow.whilst}
* @category Control Flow
* @param {Function} iteratee - A function which is called each time `test`
* passes. The function is passed a `callback(err)`, which must be called once
* it has completed with an optional `err` argument. Invoked with (callback).
* @param {Function} test - synchronous truth test to perform after each
* execution of `iteratee`. Invoked with Invoked with the non-error callback
* results of `iteratee`.
* @param {Function} [callback] - A callback which is called after the test
* function has failed and repeated execution of `iteratee` has stopped.
* `callback` will be passed an error and any arguments passed to the final
* `iteratee`'s callback. Invoked with (err, [results]);
*/
function doWhilst(iteratee, test, callback) {
callback = onlyOnce(callback || noop);
var next = rest(function (err, args) {
if (err) return callback(err);
if (test.apply(this, args)) return iteratee(next);
callback.apply(null, [null].concat(args));
});
iteratee(next);
}
/**
* Like ['doWhilst']{@link module:ControlFlow.doWhilst}, except the `test` is inverted. Note the
* argument ordering differs from `until`.
*
* @name doUntil
* @static
* @memberOf module:ControlFlow
* @method
* @see [async.doWhilst]{@link module:ControlFlow.doWhilst}
* @category Control Flow
* @param {Function} fn - A function which is called each time `test` fails.
* The function is passed a `callback(err)`, which must be called once it has
* completed with an optional `err` argument. Invoked with (callback).
* @param {Function} test - synchronous truth test to perform after each
* execution of `fn`. Invoked with the non-error callback results of `fn`.
* @param {Function} [callback] - A callback which is called after the test
* function has passed and repeated execution of `fn` has stopped. `callback`
* will be passed an error and any arguments passed to the final `fn`'s
* callback. Invoked with (err, [results]);
*/
function doUntil(fn, test, callback) {
doWhilst(fn, function () {
return !test.apply(this, arguments);
}, callback);
}
/**
* Like [`whilst`]{@link module:ControlFlow.whilst}, except the `test` is an asynchronous function that
* is passed a callback in the form of `function (err, truth)`. If error is
* passed to `test` or `fn`, the main callback is immediately called with the
* value of the error.
*
* @name during
* @static
* @memberOf module:ControlFlow
* @method
* @see [async.whilst]{@link module:ControlFlow.whilst}
* @category Control Flow
* @param {Function} test - asynchronous truth test to perform before each
* execution of `fn`. Invoked with (callback).
* @param {Function} fn - A function which is called each time `test` passes.
* The function is passed a `callback(err)`, which must be called once it has
* completed with an optional `err` argument. Invoked with (callback).
* @param {Function} [callback] - A callback which is called after the test
* function has failed and repeated execution of `fn` has stopped. `callback`
* will be passed an error, if one occured, otherwise `null`.
* @example
*
* var count = 0;
*
* async.during(
* function (callback) {
* return callback(null, count < 5);
* },
* function (callback) {
* count++;
* setTimeout(callback, 1000);
* },
* function (err) {
* // 5 seconds have passed
* }
* );
*/
function during(test, fn, callback) {
callback = onlyOnce(callback || noop);
function next(err) {
if (err) return callback(err);
test(check);
}
function check(err, truth) {
if (err) return callback(err);
if (!truth) return callback(null);
fn(next);
}
test(check);
}
function _withoutIndex(iteratee) {
return function (value, index, callback) {
return iteratee(value, callback);
};
}
/**
* Applies the function `iteratee` to each item in `coll`, in parallel.
* The `iteratee` is called with an item from the list, and a callback for when
* it has finished. If the `iteratee` passes an error to its `callback`, the
* main `callback` (for the `each` function) is immediately called with the
* error.
*
* Note, that since this function applies `iteratee` to each item in parallel,
* there is no guarantee that the iteratee functions will complete in order.
*
* @name each
* @static
* @memberOf module:Collections
* @method
* @alias forEach
* @category Collection
* @param {Array|Iterable|Object} coll - A collection to iterate over.
* @param {Function} iteratee - A function to apply to each item
* in `coll`. The iteratee is passed a `callback(err)` which must be called once
* it has completed. If no error has occurred, the `callback` should be run
* without arguments or with an explicit `null` argument. The array index is not
* passed to the iteratee. Invoked with (item, callback). If you need the index,
* use `eachOf`.
* @param {Function} [callback] - A callback which is called when all
* `iteratee` functions have finished, or an error occurs. Invoked with (err).
* @example
*
* // assuming openFiles is an array of file names and saveFile is a function
* // to save the modified contents of that file:
*
* async.each(openFiles, saveFile, function(err){
* // if any of the saves produced an error, err would equal that error
* });
*
* // assuming openFiles is an array of file names
* async.each(openFiles, function(file, callback) {
*
* // Perform operation on file here.
* console.log('Processing file ' + file);
*
* if( file.length > 32 ) {
* console.log('This file name is too long');
* callback('File name too long');
* } else {
* // Do work to process file here
* console.log('File processed');
* callback();
* }
* }, function(err) {
* // if any of the file processing produced an error, err would equal that error
* if( err ) {
* // One of the iterations produced an error.
* // All processing will now stop.
* console.log('A file failed to process');
* } else {
* console.log('All files have been processed successfully');
* }
* });
*/
function eachLimit(coll, iteratee, callback) {
eachOf(coll, _withoutIndex(iteratee), callback);
}
/**
* The same as [`each`]{@link module:Collections.each} but runs a maximum of `limit` async operations at a time.
*
* @name eachLimit
* @static
* @memberOf module:Collections
* @method
* @see [async.each]{@link module:Collections.each}
* @alias forEachLimit
* @category Collection
* @param {Array|Iterable|Object} coll - A colleciton to iterate over.
* @param {number} limit - The maximum number of async operations at a time.
* @param {Function} iteratee - A function to apply to each item in `coll`. The
* iteratee is passed a `callback(err)` which must be called once it has
* completed. If no error has occurred, the `callback` should be run without
* arguments or with an explicit `null` argument. The array index is not passed
* to the iteratee. Invoked with (item, callback). If you need the index, use
* `eachOfLimit`.
* @param {Function} [callback] - A callback which is called when all
* `iteratee` functions have finished, or an error occurs. Invoked with (err).
*/
function eachLimit$1(coll, limit, iteratee, callback) {
_eachOfLimit(limit)(coll, _withoutIndex(iteratee), callback);
}
/**
* The same as [`each`]{@link module:Collections.each} but runs only a single async operation at a time.
*
* @name eachSeries
* @static
* @memberOf module:Collections
* @method
* @see [async.each]{@link module:Collections.each}
* @alias forEachSeries
* @category Collection
* @param {Array|Iterable|Object} coll - A collection to iterate over.
* @param {Function} iteratee - A function to apply to each
* item in `coll`. The iteratee is passed a `callback(err)` which must be called
* once it has completed. If no error has occurred, the `callback` should be run
* without arguments or with an explicit `null` argument. The array index is
* not passed to the iteratee. Invoked with (item, callback). If you need the
* index, use `eachOfSeries`.
* @param {Function} [callback] - A callback which is called when all
* `iteratee` functions have finished, or an error occurs. Invoked with (err).
*/
var eachSeries = doLimit(eachLimit$1, 1);
/**
* Wrap an async function and ensure it calls its callback on a later tick of
* the event loop. If the function already calls its callback on a next tick,
* no extra deferral is added. This is useful for preventing stack overflows
* (`RangeError: Maximum call stack size exceeded`) and generally keeping
* [Zalgo](http://blog.izs.me/post/59142742143/designing-apis-for-asynchrony)
* contained.
*
* @name ensureAsync
* @static
* @memberOf module:Utils
* @method
* @category Util
* @param {Function} fn - an async function, one that expects a node-style
* callback as its last argument.
* @returns {Function} Returns a wrapped function with the exact same call
* signature as the function passed in.
* @example
*
* function sometimesAsync(arg, callback) {
* if (cache[arg]) {
* return callback(null, cache[arg]); // this would be synchronous!!
* } else {
* doSomeIO(arg, callback); // this IO would be asynchronous
* }
* }
*
* // this has a risk of stack overflows if many results are cached in a row
* async.mapSeries(args, sometimesAsync, done);
*
* // this will defer sometimesAsync's callback if necessary,
* // preventing stack overflows
* async.mapSeries(args, async.ensureAsync(sometimesAsync), done);
*/
function ensureAsync(fn) {
return initialParams(function (args, callback) {
var sync = true;
args.push(function () {
var innerArgs = arguments;
if (sync) {
setImmediate$1(function () {
callback.apply(null, innerArgs);
});
} else {
callback.apply(null, innerArgs);
}
});
fn.apply(this, args);
sync = false;
});
}
function notId(v) {
return !v;
}
/**
* Returns `true` if every element in `coll` satisfies an async test. If any
* iteratee call returns `false`, the main `callback` is immediately called.
*
* @name every
* @static
* @memberOf module:Collections
* @method
* @alias all
* @category Collection
* @param {Array|Iterable|Object} coll - A collection to iterate over.
* @param {Function} iteratee - A truth test to apply to each item in the
* collection in parallel. The iteratee is passed a `callback(err, truthValue)`
* which must be called with a boolean argument once it has completed. Invoked
* with (item, callback).
* @param {Function} [callback] - A callback which is called after all the
* `iteratee` functions have finished. Result will be either `true` or `false`
* depending on the values of the async tests. Invoked with (err, result).
* @example
*
* async.every(['file1','file2','file3'], function(filePath, callback) {
* fs.access(filePath, function(err) {
* callback(null, !err)
* });
* }, function(err, result) {
* // if result is true then every file exists
* });
*/
var every = _createTester(eachOf, notId, notId);
/**
* The same as [`every`]{@link module:Collections.every} but runs a maximum of `limit` async operations at a time.
*
* @name everyLimit
* @static
* @memberOf module:Collections
* @method
* @see [async.every]{@link module:Collections.every}
* @alias allLimit
* @category Collection
* @param {Array|Iterable|Object} coll - A collection to iterate over.
* @param {number} limit - The maximum number of async operations at a time.
* @param {Function} iteratee - A truth test to apply to each item in the
* collection in parallel. The iteratee is passed a `callback(err, truthValue)`
* which must be called with a boolean argument once it has completed. Invoked
* with (item, callback).
* @param {Function} [callback] - A callback which is called after all the
* `iteratee` functions have finished. Result will be either `true` or `false`
* depending on the values of the async tests. Invoked with (err, result).
*/
var everyLimit = _createTester(eachOfLimit, notId, notId);
/**
* The same as [`every`]{@link module:Collections.every} but runs only a single async operation at a time.
*
* @name everySeries
* @static
* @memberOf module:Collections
* @method
* @see [async.every]{@link module:Collections.every}
* @alias allSeries
* @category Collection
* @param {Array|Iterable|Object} coll - A collection to iterate over.
* @param {Function} iteratee - A truth test to apply to each item in the
* collection in parallel. The iteratee is passed a `callback(err, truthValue)`
* which must be called with a boolean argument once it has completed. Invoked
* with (item, callback).
* @param {Function} [callback] - A callback which is called after all the
* `iteratee` functions have finished. Result will be either `true` or `false`
* depending on the values of the async tests. Invoked with (err, result).
*/
var everySeries = doLimit(everyLimit, 1);
function _filter(eachfn, arr, iteratee, callback) {
callback = once(callback || noop);
var results = [];
eachfn(arr, function (x, index, callback) {
iteratee(x, function (err, v) {
if (err) {
callback(err);
} else {
if (v) {
results.push({ index: index, value: x });
}
callback();
}
});
}, function (err) {
if (err) {
callback(err);
} else {
callback(null, arrayMap(results.sort(function (a, b) {
return a.index - b.index;
}), baseProperty('value')));
}
});
}
/**
* Returns a new array of all the values in `coll` which pass an async truth
* test. This operation is performed in parallel, but the results array will be
* in the same order as the original.
*
* @name filter
* @static
* @memberOf module:Collections
* @method
* @alias select
* @category Collection
* @param {Array|Iterable|Object} coll - A collection to iterate over.
* @param {Function} iteratee - A truth test to apply to each item in `coll`.
* The `iteratee` is passed a `callback(err, truthValue)`, which must be called
* with a boolean argument once it has completed. Invoked with (item, callback).
* @param {Function} [callback] - A callback which is called after all the
* `iteratee` functions have finished. Invoked with (err, results).
* @example
*
* async.filter(['file1','file2','file3'], function(filePath, callback) {
* fs.access(filePath, function(err) {
* callback(null, !err)
* });
* }, function(err, results) {
* // results now equals an array of the existing files
* });
*/
var filter = doParallel(_filter);
/**
* The same as [`filter`]{@link module:Collections.filter} but runs a maximum of `limit` async operations at a
* time.
*
* @name filterLimit
* @static
* @memberOf module:Collections
* @method
* @see [async.filter]{@link module:Collections.filter}
* @alias selectLimit
* @category Collection
* @param {Array|Iterable|Object} coll - A collection to iterate over.
* @param {number} limit - The maximum number of async operations at a time.
* @param {Function} iteratee - A truth test to apply to each item in `coll`.
* The `iteratee` is passed a `callback(err, truthValue)`, which must be called
* with a boolean argument once it has completed. Invoked with (item, callback).
* @param {Function} [callback] - A callback which is called after all the
* `iteratee` functions have finished. Invoked with (err, results).
*/
var filterLimit = doParallelLimit(_filter);
/**
* The same as [`filter`]{@link module:Collections.filter} but runs only a single async operation at a time.
*
* @name filterSeries
* @static
* @memberOf module:Collections
* @method
* @see [async.filter]{@link module:Collections.filter}
* @alias selectSeries
* @category Collection
* @param {Array|Iterable|Object} coll - A collection to iterate over.
* @param {Function} iteratee - A truth test to apply to each item in `coll`.
* The `iteratee` is passed a `callback(err, truthValue)`, which must be called
* with a boolean argument once it has completed. Invoked with (item, callback).
* @param {Function} [callback] - A callback which is called after all the
* `iteratee` functions have finished. Invoked with (err, results)
*/
var filterSeries = doLimit(filterLimit, 1);
/**
* Calls the asynchronous function `fn` with a callback parameter that allows it
* to call itself again, in series, indefinitely.
* If an error is passed to the
* callback then `errback` is called with the error, and execution stops,
* otherwise it will never be called.
*
* @name forever
* @static
* @memberOf module:ControlFlow
* @method
* @category Control Flow
* @param {Function} fn - a function to call repeatedly. Invoked with (next).
* @param {Function} [errback] - when `fn` passes an error to it's callback,
* this function will be called, and execution stops. Invoked with (err).
* @example
*
* async.forever(
* function(next) {
* // next is suitable for passing to things that need a callback(err [, whatever]);
* // it will result in this function being called again.
* },
* function(err) {
* // if next is called with a value in its first parameter, it will appear
* // in here as 'err', and execution will stop.
* }
* );
*/
function forever(fn, errback) {
var done = onlyOnce(errback || noop);
var task = ensureAsync(fn);
function next(err) {
if (err) return done(err);
task(next);
}
next();
}
/**
* Logs the result of an `async` function to the `console`. Only works in
* Node.js or in browsers that support `console.log` and `console.error` (such
* as FF and Chrome). If multiple arguments are returned from the async
* function, `console.log` is called on each argument in order.
*
* @name log
* @static
* @memberOf module:Utils
* @method
* @category Util
* @param {Function} function - The function you want to eventually apply all
* arguments to.
* @param {...*} arguments... - Any number of arguments to apply to the function.
* @example
*
* // in a module
* var hello = function(name, callback) {
* setTimeout(function() {
* callback(null, 'hello ' + name);
* }, 1000);
* };
*
* // in the node repl
* node> async.log(hello, 'world');
* 'hello world'
*/
var log = consoleFunc('log');
/**
* The same as [`mapValues`]{@link module:Collections.mapValues} but runs a maximum of `limit` async operations at a
* time.
*
* @name mapValuesLimit
* @static
* @memberOf module:Collections
* @method
* @see [async.mapValues]{@link module:Collections.mapValues}
* @category Collection
* @param {Object} obj - A collection to iterate over.
* @param {number} limit - The maximum number of async operations at a time.
* @param {Function} iteratee - A function to apply to each value in `obj`.
* The iteratee is passed a `callback(err, transformed)` which must be called
* once it has completed with an error (which can be `null`) and a
* transformed value. Invoked with (value, key, callback).
* @param {Function} [callback] - A callback which is called when all `iteratee`
* functions have finished, or an error occurs. Result is an object of the
* transformed values from the `obj`. Invoked with (err, result).
*/
function mapValuesLimit(obj, limit, iteratee, callback) {
callback = once(callback || noop);
var newObj = {};
eachOfLimit(obj, limit, function (val, key, next) {
iteratee(val, key, function (err, result) {
if (err) return next(err);
newObj[key] = result;
next();
});
}, function (err) {
callback(err, newObj);
});
}
/**
* A relative of [`map`]{@link module:Collections.map}, designed for use with objects.
*
* Produces a new Object by mapping each value of `obj` through the `iteratee`
* function. The `iteratee` is called each `value` and `key` from `obj` and a
* callback for when it has finished processing. Each of these callbacks takes
* two arguments: an `error`, and the transformed item from `obj`. If `iteratee`
* passes an error to its callback, the main `callback` (for the `mapValues`
* function) is immediately called with the error.
*
* Note, the order of the keys in the result is not guaranteed. The keys will
* be roughly in the order they complete, (but this is very engine-specific)
*
* @name mapValues
* @static
* @memberOf module:Collections
* @method
* @category Collection
* @param {Object} obj - A collection to iterate over.
* @param {Function} iteratee - A function to apply to each value and key in
* `coll`. The iteratee is passed a `callback(err, transformed)` which must be
* called once it has completed with an error (which can be `null`) and a
* transformed value. Invoked with (value, key, callback).
* @param {Function} [callback] - A callback which is called when all `iteratee`
* functions have finished, or an error occurs. Results is an array of the
* transformed items from the `obj`. Invoked with (err, result).
* @example
*
* async.mapValues({
* f1: 'file1',
* f2: 'file2',
* f3: 'file3'
* }, function (file, key, callback) {
* fs.stat(file, callback);
* }, function(err, result) {
* // results is now a map of stats for each file, e.g.
* // {
* // f1: [stats for file1],
* // f2: [stats for file2],
* // f3: [stats for file3]
* // }
* });
*/
var mapValues = doLimit(mapValuesLimit, Infinity);
/**
* The same as [`mapValues`]{@link module:Collections.mapValues} but runs only a single async operation at a time.
*
* @name mapValuesSeries
* @static
* @memberOf module:Collections
* @method
* @see [async.mapValues]{@link module:Collections.mapValues}
* @category Collection
* @param {Object} obj - A collection to iterate over.
* @param {Function} iteratee - A function to apply to each value in `obj`.
* The iteratee is passed a `callback(err, transformed)` which must be called
* once it has completed with an error (which can be `null`) and a
* transformed value. Invoked with (value, key, callback).
* @param {Function} [callback] - A callback which is called when all `iteratee`
* functions have finished, or an error occurs. Result is an object of the
* transformed values from the `obj`. Invoked with (err, result).
*/
var mapValuesSeries = doLimit(mapValuesLimit, 1);
function has(obj, key) {
return key in obj;
}
/**
* Caches the results of an `async` function. When creating a hash to store
* function results against, the callback is omitted from the hash and an
* optional hash function can be used.
*
* If no hash function is specified, the first argument is used as a hash key,
* which may work reasonably if it is a string or a data type that converts to a
* distinct string. Note that objects and arrays will not behave reasonably.
* Neither will cases where the other arguments are significant. In such cases,
* specify your own hash function.
*
* The cache of results is exposed as the `memo` property of the function
* returned by `memoize`.
*
* @name memoize
* @static
* @memberOf module:Utils
* @method
* @category Util
* @param {Function} fn - The function to proxy and cache results from.
* @param {Function} hasher - An optional function for generating a custom hash
* for storing results. It has all the arguments applied to it apart from the
* callback, and must be synchronous.
* @returns {Function} a memoized version of `fn`
* @example
*
* var slow_fn = function(name, callback) {
* // do something
* callback(null, result);
* };
* var fn = async.memoize(slow_fn);
*
* // fn can now be used as if it were slow_fn
* fn('some name', function() {
* // callback
* });
*/
function memoize(fn, hasher) {
var memo = Object.create(null);
var queues = Object.create(null);
hasher = hasher || identity;
var memoized = initialParams(function memoized(args, callback) {
var key = hasher.apply(null, args);
if (has(memo, key)) {
setImmediate$1(function () {
callback.apply(null, memo[key]);
});
} else if (has(queues, key)) {
queues[key].push(callback);
} else {
queues[key] = [callback];
fn.apply(null, args.concat([rest(function (args) {
memo[key] = args;
var q = queues[key];
delete queues[key];
for (var i = 0, l = q.length; i < l; i++) {
q[i].apply(null, args);
}
})]));
}
});
memoized.memo = memo;
memoized.unmemoized = fn;
return memoized;
}
/**
* Calls `callback` on a later loop around the event loop. In Node.js this just
* calls `setImmediate`. In the browser it will use `setImmediate` if
* available, otherwise `setTimeout(callback, 0)`, which means other higher
* priority events may precede the execution of `callback`.
*
* This is used internally for browser-compatibility purposes.
*
* @name nextTick
* @static
* @memberOf module:Utils
* @method
* @alias setImmediate
* @category Util
* @param {Function} callback - The function to call on a later loop around
* the event loop. Invoked with (args...).
* @param {...*} args... - any number of additional arguments to pass to the
* callback on the next tick.
* @example
*
* var call_order = [];
* async.nextTick(function() {
* call_order.push('two');
* // call_order now equals ['one','two']
* });
* call_order.push('one');
*
* async.setImmediate(function (a, b, c) {
* // a, b, and c equal 1, 2, and 3
* }, 1, 2, 3);
*/
var _defer$1;
if (hasNextTick) {
_defer$1 = process.nextTick;
} else if (hasSetImmediate) {
_defer$1 = setImmediate;
} else {
_defer$1 = fallback;
}
var nextTick = wrap(_defer$1);
function _parallel(eachfn, tasks, callback) {
callback = callback || noop;
var results = isArrayLike(tasks) ? [] : {};
eachfn(tasks, function (task, key, callback) {
task(rest(function (err, args) {
if (args.length <= 1) {
args = args[0];
}
results[key] = args;
callback(err);
}));
}, function (err) {
callback(err, results);
});
}
/**
* Run the `tasks` collection of functions in parallel, without waiting until
* the previous function has completed. If any of the functions pass an error to
* its callback, the main `callback` is immediately called with the value of the
* error. Once the `tasks` have completed, the results are passed to the final
* `callback` as an array.
*
* **Note:** `parallel` is about kicking-off I/O tasks in parallel, not about
* parallel execution of code. If your tasks do not use any timers or perform
* any I/O, they will actually be executed in series. Any synchronous setup
* sections for each task will happen one after the other. JavaScript remains
* single-threaded.
*
* It is also possible to use an object instead of an array. Each property will
* be run as a function and the results will be passed to the final `callback`
* as an object instead of an array. This can be a more readable way of handling
* results from {@link async.parallel}.
*
* @name parallel
* @static
* @memberOf module:ControlFlow
* @method
* @category Control Flow
* @param {Array|Iterable|Object} tasks - A collection containing functions to run.
* Each function is passed a `callback(err, result)` which it must call on
* completion with an error `err` (which can be `null`) and an optional `result`
* value.
* @param {Function} [callback] - An optional callback to run once all the
* functions have completed successfully. This function gets a results array
* (or object) containing all the result arguments passed to the task callbacks.
* Invoked with (err, results).
* @example
* async.parallel([
* function(callback) {
* setTimeout(function() {
* callback(null, 'one');
* }, 200);
* },
* function(callback) {
* setTimeout(function() {
* callback(null, 'two');
* }, 100);
* }
* ],
* // optional callback
* function(err, results) {
* // the results array will equal ['one','two'] even though
* // the second function had a shorter timeout.
* });
*
* // an example using an object instead of an array
* async.parallel({
* one: function(callback) {
* setTimeout(function() {
* callback(null, 1);
* }, 200);
* },
* two: function(callback) {
* setTimeout(function() {
* callback(null, 2);
* }, 100);
* }
* }, function(err, results) {
* // results is now equals to: {one: 1, two: 2}
* });
*/
function parallelLimit(tasks, callback) {
_parallel(eachOf, tasks, callback);
}
/**
* The same as [`parallel`]{@link module:ControlFlow.parallel} but runs a maximum of `limit` async operations at a
* time.
*
* @name parallelLimit
* @static
* @memberOf module:ControlFlow
* @method
* @see [async.parallel]{@link module:ControlFlow.parallel}
* @category Control Flow
* @param {Array|Collection} tasks - A collection containing functions to run.
* Each function is passed a `callback(err, result)` which it must call on
* completion with an error `err` (which can be `null`) and an optional `result`
* value.
* @param {number} limit - The maximum number of async operations at a time.
* @param {Function} [callback] - An optional callback to run once all the
* functions have completed successfully. This function gets a results array
* (or object) containing all the result arguments passed to the task callbacks.
* Invoked with (err, results).
*/
function parallelLimit$1(tasks, limit, callback) {
_parallel(_eachOfLimit(limit), tasks, callback);
}
/**
* A queue of tasks for the worker function to complete.
* @typedef {Object} QueueObject
* @memberOf module:ControlFlow
* @property {Function} length - a function returning the number of items
* waiting to be processed. Invoke with `queue.length()`.
* @property {boolean} started - a boolean indicating whether or not any
* items have been pushed and processed by the queue.
* @property {Function} running - a function returning the number of items
* currently being processed. Invoke with `queue.running()`.
* @property {Function} workersList - a function returning the array of items
* currently being processed. Invoke with `queue.workersList()`.
* @property {Function} idle - a function returning false if there are items
* waiting or being processed, or true if not. Invoke with `queue.idle()`.
* @property {number} concurrency - an integer for determining how many `worker`
* functions should be run in parallel. This property can be changed after a
* `queue` is created to alter the concurrency on-the-fly.
* @property {Function} push - add a new task to the `queue`. Calls `callback`
* once the `worker` has finished processing the task. Instead of a single task,
* a `tasks` array can be submitted. The respective callback is used for every
* task in the list. Invoke with `queue.push(task, [callback])`,
* @property {Function} unshift - add a new task to the front of the `queue`.
* Invoke with `queue.unshift(task, [callback])`.
* @property {Function} saturated - a callback that is called when the number of
* running workers hits the `concurrency` limit, and further tasks will be
* queued.
* @property {Function} unsaturated - a callback that is called when the number
* of running workers is less than the `concurrency` & `buffer` limits, and
* further tasks will not be queued.
* @property {number} buffer - A minimum threshold buffer in order to say that
* the `queue` is `unsaturated`.
* @property {Function} empty - a callback that is called when the last item
* from the `queue` is given to a `worker`.
* @property {Function} drain - a callback that is called when the last item
* from the `queue` has returned from the `worker`.
* @property {Function} error - a callback that is called when a task errors.
* Has the signature `function(error, task)`.
* @property {boolean} paused - a boolean for determining whether the queue is
* in a paused state.
* @property {Function} pause - a function that pauses the processing of tasks
* until `resume()` is called. Invoke with `queue.pause()`.
* @property {Function} resume - a function that resumes the processing of
* queued tasks when the queue is paused. Invoke with `queue.resume()`.
* @property {Function} kill - a function that removes the `drain` callback and
* empties remaining tasks from the queue forcing it to go idle. Invoke with `queue.kill()`.
*/
/**
* Creates a `queue` object with the specified `concurrency`. Tasks added to the
* `queue` are processed in parallel (up to the `concurrency` limit). If all
* `worker`s are in progress, the task is queued until one becomes available.
* Once a `worker` completes a `task`, that `task`'s callback is called.
*
* @name queue
* @static
* @memberOf module:ControlFlow
* @method
* @category Control Flow
* @param {Function} worker - An asynchronous function for processing a queued
* task, which must call its `callback(err)` argument when finished, with an
* optional `error` as an argument. If you want to handle errors from an
* individual task, pass a callback to `q.push()`. Invoked with
* (task, callback).
* @param {number} [concurrency=1] - An `integer` for determining how many
* `worker` functions should be run in parallel. If omitted, the concurrency
* defaults to `1`. If the concurrency is `0`, an error is thrown.
* @returns {module:ControlFlow.QueueObject} A queue object to manage the tasks. Callbacks can
* attached as certain properties to listen for specific events during the
* lifecycle of the queue.
* @example
*
* // create a queue object with concurrency 2
* var q = async.queue(function(task, callback) {
* console.log('hello ' + task.name);
* callback();
* }, 2);
*
* // assign a callback
* q.drain = function() {
* console.log('all items have been processed');
* };
*
* // add some items to the queue
* q.push({name: 'foo'}, function(err) {
* console.log('finished processing foo');
* });
* q.push({name: 'bar'}, function (err) {
* console.log('finished processing bar');
* });
*
* // add some items to the queue (batch-wise)
* q.push([{name: 'baz'},{name: 'bay'},{name: 'bax'}], function(err) {
* console.log('finished processing item');
* });
*
* // add some items to the front of the queue
* q.unshift({name: 'bar'}, function (err) {
* console.log('finished processing bar');
* });
*/
function queue$1 (worker, concurrency) {
return queue(function (items, cb) {
worker(items[0], cb);
}, concurrency, 1);
}
/**
* The same as [async.queue]{@link module:ControlFlow.queue} only tasks are assigned a priority and
* completed in ascending priority order.
*
* @name priorityQueue
* @static
* @memberOf module:ControlFlow
* @method
* @see [async.queue]{@link module:ControlFlow.queue}
* @category Control Flow
* @param {Function} worker - An asynchronous function for processing a queued
* task, which must call its `callback(err)` argument when finished, with an
* optional `error` as an argument. If you want to handle errors from an
* individual task, pass a callback to `q.push()`. Invoked with
* (task, callback).
* @param {number} concurrency - An `integer` for determining how many `worker`
* functions should be run in parallel. If omitted, the concurrency defaults to
* `1`. If the concurrency is `0`, an error is thrown.
* @returns {module:ControlFlow.QueueObject} A priorityQueue object to manage the tasks. There are two
* differences between `queue` and `priorityQueue` objects:
* * `push(task, priority, [callback])` - `priority` should be a number. If an
* array of `tasks` is given, all tasks will be assigned the same priority.
* * The `unshift` method was removed.
*/
function priorityQueue (worker, concurrency) {
// Start with a normal queue
var q = queue$1(worker, concurrency);
// Override push to accept second parameter representing priority
q.push = function (data, priority, callback) {
if (callback == null) callback = noop;
if (typeof callback !== 'function') {
throw new Error('task callback must be a function');
}
q.started = true;
if (!isArray(data)) {
data = [data];
}
if (data.length === 0) {
// call drain immediately if there are no tasks
return setImmediate$1(function () {
q.drain();
});
}
priority = priority || 0;
var nextNode = q._tasks.head;
while (nextNode && priority >= nextNode.priority) {
nextNode = nextNode.next;
}
arrayEach(data, function (task) {
var item = {
data: task,
priority: priority,
callback: callback
};
if (nextNode) {
q._tasks.insertBefore(nextNode, item);
} else {
q._tasks.push(item);
}
});
setImmediate$1(q.process);
};
// Remove unshift function
delete q.unshift;
return q;
}
/**
* Runs the `tasks` array of functions in parallel, without waiting until the
* previous function has completed. Once any the `tasks` completed or pass an
* error to its callback, the main `callback` is immediately called. It's
* equivalent to `Promise.race()`.
*
* @name race
* @static
* @memberOf module:ControlFlow
* @method
* @category Control Flow
* @param {Array} tasks - An array containing functions to run. Each function
* is passed a `callback(err, result)` which it must call on completion with an
* error `err` (which can be `null`) and an optional `result` value.
* @param {Function} callback - A callback to run once any of the functions have
* completed. This function gets an error or result from the first function that
* completed. Invoked with (err, result).
* @returns undefined
* @example
*
* async.race([
* function(callback) {
* setTimeout(function() {
* callback(null, 'one');
* }, 200);
* },
* function(callback) {
* setTimeout(function() {
* callback(null, 'two');
* }, 100);
* }
* ],
* // main callback
* function(err, result) {
* // the result will be equal to 'two' as it finishes earlier
* });
*/
function race(tasks, callback) {
callback = once(callback || noop);
if (!isArray(tasks)) return callback(new TypeError('First argument to race must be an array of functions'));
if (!tasks.length) return callback();
arrayEach(tasks, function (task) {
task(callback);
});
}
var slice = Array.prototype.slice;
/**
* Same as [`reduce`]{@link module:Collections.reduce}, only operates on `array` in reverse order.
*
* @name reduceRight
* @static
* @memberOf module:Collections
* @method
* @see [async.reduce]{@link module:Collections.reduce}
* @alias foldr
* @category Collection
* @param {Array} array - A collection to iterate over.
* @param {*} memo - The initial state of the reduction.
* @param {Function} iteratee - A function applied to each item in the
* array to produce the next step in the reduction. The `iteratee` is passed a
* `callback(err, reduction)` which accepts an optional error as its first
* argument, and the state of the reduction as the second. If an error is
* passed to the callback, the reduction is stopped and the main `callback` is
* immediately called with the error. Invoked with (memo, item, callback).
* @param {Function} [callback] - A callback which is called after all the
* `iteratee` functions have finished. Result is the reduced value. Invoked with
* (err, result).
*/
function reduceRight(array, memo, iteratee, callback) {
var reversed = slice.call(array).reverse();
reduce(reversed, memo, iteratee, callback);
}
/**
* Wraps the function in another function that always returns data even when it
* errors.
*
* The object returned has either the property `error` or `value`.
*
* @name reflect
* @static
* @memberOf module:Utils
* @method
* @category Util
* @param {Function} fn - The function you want to wrap
* @returns {Function} - A function that always passes null to it's callback as
* the error. The second argument to the callback will be an `object` with
* either an `error` or a `value` property.
* @example
*
* async.parallel([
* async.reflect(function(callback) {
* // do some stuff ...
* callback(null, 'one');
* }),
* async.reflect(function(callback) {
* // do some more stuff but error ...
* callback('bad stuff happened');
* }),
* async.reflect(function(callback) {
* // do some more stuff ...
* callback(null, 'two');
* })
* ],
* // optional callback
* function(err, results) {
* // values
* // results[0].value = 'one'
* // results[1].error = 'bad stuff happened'
* // results[2].value = 'two'
* });
*/
function reflect(fn) {
return initialParams(function reflectOn(args, reflectCallback) {
args.push(rest(function callback(err, cbArgs) {
if (err) {
reflectCallback(null, {
error: err
});
} else {
var value = null;
if (cbArgs.length === 1) {
value = cbArgs[0];
} else if (cbArgs.length > 1) {
value = cbArgs;
}
reflectCallback(null, {
value: value
});
}
}));
return fn.apply(this, args);
});
}
function reject$1(eachfn, arr, iteratee, callback) {
_filter(eachfn, arr, function (value, cb) {
iteratee(value, function (err, v) {
if (err) {
cb(err);
} else {
cb(null, !v);
}
});
}, callback);
}
/**
* The opposite of [`filter`]{@link module:Collections.filter}. Removes values that pass an `async` truth test.
*
* @name reject
* @static
* @memberOf module:Collections
* @method
* @see [async.filter]{@link module:Collections.filter}
* @category Collection
* @param {Array|Iterable|Object} coll - A collection to iterate over.
* @param {Function} iteratee - A truth test to apply to each item in `coll`.
* The `iteratee` is passed a `callback(err, truthValue)`, which must be called
* with a boolean argument once it has completed. Invoked with (item, callback).
* @param {Function} [callback] - A callback which is called after all the
* `iteratee` functions have finished. Invoked with (err, results).
* @example
*
* async.reject(['file1','file2','file3'], function(filePath, callback) {
* fs.access(filePath, function(err) {
* callback(null, !err)
* });
* }, function(err, results) {
* // results now equals an array of missing files
* createFiles(results);
* });
*/
var reject = doParallel(reject$1);
/**
* A helper function that wraps an array or an object of functions with reflect.
*
* @name reflectAll
* @static
* @memberOf module:Utils
* @method
* @see [async.reflect]{@link module:Utils.reflect}
* @category Util
* @param {Array} tasks - The array of functions to wrap in `async.reflect`.
* @returns {Array} Returns an array of functions, each function wrapped in
* `async.reflect`
* @example
*
* let tasks = [
* function(callback) {
* setTimeout(function() {
* callback(null, 'one');
* }, 200);
* },
* function(callback) {
* // do some more stuff but error ...
* callback(new Error('bad stuff happened'));
* },
* function(callback) {
* setTimeout(function() {
* callback(null, 'two');
* }, 100);
* }
* ];
*
* async.parallel(async.reflectAll(tasks),
* // optional callback
* function(err, results) {
* // values
* // results[0].value = 'one'
* // results[1].error = Error('bad stuff happened')
* // results[2].value = 'two'
* });
*
* // an example using an object instead of an array
* let tasks = {
* one: function(callback) {
* setTimeout(function() {
* callback(null, 'one');
* }, 200);
* },
* two: function(callback) {
* callback('two');
* },
* three: function(callback) {
* setTimeout(function() {
* callback(null, 'three');
* }, 100);
* }
* };
*
* async.parallel(async.reflectAll(tasks),
* // optional callback
* function(err, results) {
* // values
* // results.one.value = 'one'
* // results.two.error = 'two'
* // results.three.value = 'three'
* });
*/
function reflectAll(tasks) {
var results;
if (isArray(tasks)) {
results = arrayMap(tasks, reflect);
} else {
results = {};
baseForOwn(tasks, function (task, key) {
results[key] = reflect.call(this, task);
});
}
return results;
}
/**
* The same as [`reject`]{@link module:Collections.reject} but runs a maximum of `limit` async operations at a
* time.
*
* @name rejectLimit
* @static
* @memberOf module:Collections
* @method
* @see [async.reject]{@link module:Collections.reject}
* @category Collection
* @param {Array|Iterable|Object} coll - A collection to iterate over.
* @param {number} limit - The maximum number of async operations at a time.
* @param {Function} iteratee - A truth test to apply to each item in `coll`.
* The `iteratee` is passed a `callback(err, truthValue)`, which must be called
* with a boolean argument once it has completed. Invoked with (item, callback).
* @param {Function} [callback] - A callback which is called after all the
* `iteratee` functions have finished. Invoked with (err, results).
*/
var rejectLimit = doParallelLimit(reject$1);
/**
* The same as [`reject`]{@link module:Collections.reject} but runs only a single async operation at a time.
*
* @name rejectSeries
* @static
* @memberOf module:Collections
* @method
* @see [async.reject]{@link module:Collections.reject}
* @category Collection
* @param {Array|Iterable|Object} coll - A collection to iterate over.
* @param {Function} iteratee - A truth test to apply to each item in `coll`.
* The `iteratee` is passed a `callback(err, truthValue)`, which must be called
* with a boolean argument once it has completed. Invoked with (item, callback).
* @param {Function} [callback] - A callback which is called after all the
* `iteratee` functions have finished. Invoked with (err, results).
*/
var rejectSeries = doLimit(rejectLimit, 1);
/**
* Creates a function that returns `value`.
*
* @static
* @memberOf _
* @since 2.4.0
* @category Util
* @param {*} value The value to return from the new function.
* @returns {Function} Returns the new constant function.
* @example
*
* var objects = _.times(2, _.constant({ 'a': 1 }));
*
* console.log(objects);
* // => [{ 'a': 1 }, { 'a': 1 }]
*
* console.log(objects[0] === objects[1]);
* // => true
*/
function constant$1(value) {
return function() {
return value;
};
}
/**
* Attempts to get a successful response from `task` no more than `times` times
* before returning an error. If the task is successful, the `callback` will be
* passed the result of the successful task. If all attempts fail, the callback
* will be passed the error and result (if any) of the final attempt.
*
* @name retry
* @static
* @memberOf module:ControlFlow
* @method
* @category Control Flow
* @param {Object|number} [opts = {times: 5, interval: 0}| 5] - Can be either an
* object with `times` and `interval` or a number.
* * `times` - The number of attempts to make before giving up. The default
* is `5`.
* * `interval` - The time to wait between retries, in milliseconds. The
* default is `0`. The interval may also be specified as a function of the
* retry count (see example).
* * If `opts` is a number, the number specifies the number of times to retry,
* with the default interval of `0`.
* @param {Function} task - A function which receives two arguments: (1) a
* `callback(err, result)` which must be called when finished, passing `err`
* (which can be `null`) and the `result` of the function's execution, and (2)
* a `results` object, containing the results of the previously executed
* functions (if nested inside another control flow). Invoked with
* (callback, results).
* @param {Function} [callback] - An optional callback which is called when the
* task has succeeded, or after the final failed attempt. It receives the `err`
* and `result` arguments of the last attempt at completing the `task`. Invoked
* with (err, results).
* @example
*
* // The `retry` function can be used as a stand-alone control flow by passing
* // a callback, as shown below:
*
* // try calling apiMethod 3 times
* async.retry(3, apiMethod, function(err, result) {
* // do something with the result
* });
*
* // try calling apiMethod 3 times, waiting 200 ms between each retry
* async.retry({times: 3, interval: 200}, apiMethod, function(err, result) {
* // do something with the result
* });
*
* // try calling apiMethod 10 times with exponential backoff
* // (i.e. intervals of 100, 200, 400, 800, 1600, ... milliseconds)
* async.retry({
* times: 10,
* interval: function(retryCount) {
* return 50 * Math.pow(2, retryCount);
* }
* }, apiMethod, function(err, result) {
* // do something with the result
* });
*
* // try calling apiMethod the default 5 times no delay between each retry
* async.retry(apiMethod, function(err, result) {
* // do something with the result
* });
*
* // It can also be embedded within other control flow functions to retry
* // individual methods that are not as reliable, like this:
* async.auto({
* users: api.getUsers.bind(api),
* payments: async.retry(3, api.getPayments.bind(api))
* }, function(err, results) {
* // do something with the results
* });
*/
function retry(opts, task, callback) {
var DEFAULT_TIMES = 5;
var DEFAULT_INTERVAL = 0;
var options = {
times: DEFAULT_TIMES,
intervalFunc: constant$1(DEFAULT_INTERVAL)
};
function parseTimes(acc, t) {
if (typeof t === 'object') {
acc.times = +t.times || DEFAULT_TIMES;
acc.intervalFunc = typeof t.interval === 'function' ? t.interval : constant$1(+t.interval || DEFAULT_INTERVAL);
} else if (typeof t === 'number' || typeof t === 'string') {
acc.times = +t || DEFAULT_TIMES;
} else {
throw new Error("Invalid arguments for async.retry");
}
}
if (arguments.length < 3 && typeof opts === 'function') {
callback = task || noop;
task = opts;
} else {
parseTimes(options, opts);
callback = callback || noop;
}
if (typeof task !== 'function') {
throw new Error("Invalid arguments for async.retry");
}
var attempt = 1;
function retryAttempt() {
task(function (err) {
if (err && attempt++ < options.times) {
setTimeout(retryAttempt, options.intervalFunc(attempt));
} else {
callback.apply(null, arguments);
}
});
}
retryAttempt();
}
/**
* A close relative of [`retry`]{@link module:ControlFlow.retry}. This method wraps a task and makes it
* retryable, rather than immediately calling it with retries.
*
* @name retryable
* @static
* @memberOf module:ControlFlow
* @method
* @see [async.retry]{@link module:ControlFlow.retry}
* @category Control Flow
* @param {Object|number} [opts = {times: 5, interval: 0}| 5] - optional
* options, exactly the same as from `retry`
* @param {Function} task - the asynchronous function to wrap
* @returns {Functions} The wrapped function, which when invoked, will retry on
* an error, based on the parameters specified in `opts`.
* @example
*
* async.auto({
* dep1: async.retryable(3, getFromFlakyService),
* process: ["dep1", async.retryable(3, function (results, cb) {
* maybeProcessData(results.dep1, cb);
* })]
* }, callback);
*/
function retryable (opts, task) {
if (!task) {
task = opts;
opts = null;
}
return initialParams(function (args, callback) {
function taskFn(cb) {
task.apply(null, args.concat([cb]));
}
if (opts) retry(opts, taskFn, callback);else retry(taskFn, callback);
});
}
/**
* Run the functions in the `tasks` collection in series, each one running once
* the previous function has completed. If any functions in the series pass an
* error to its callback, no more functions are run, and `callback` is
* immediately called with the value of the error. Otherwise, `callback`
* receives an array of results when `tasks` have completed.
*
* It is also possible to use an object instead of an array. Each property will
* be run as a function, and the results will be passed to the final `callback`
* as an object instead of an array. This can be a more readable way of handling
* results from {@link async.series}.
*
* **Note** that while many implementations preserve the order of object
* properties, the [ECMAScript Language Specification](http://www.ecma-international.org/ecma-262/5.1/#sec-8.6)
* explicitly states that
*
* > The mechanics and order of enumerating the properties is not specified.
*
* So if you rely on the order in which your series of functions are executed,
* and want this to work on all platforms, consider using an array.
*
* @name series
* @static
* @memberOf module:ControlFlow
* @method
* @category Control Flow
* @param {Array|Iterable|Object} tasks - A collection containing functions to run, each
* function is passed a `callback(err, result)` it must call on completion with
* an error `err` (which can be `null`) and an optional `result` value.
* @param {Function} [callback] - An optional callback to run once all the
* functions have completed. This function gets a results array (or object)
* containing all the result arguments passed to the `task` callbacks. Invoked
* with (err, result).
* @example
* async.series([
* function(callback) {
* // do some stuff ...
* callback(null, 'one');
* },
* function(callback) {
* // do some more stuff ...
* callback(null, 'two');
* }
* ],
* // optional callback
* function(err, results) {
* // results is now equal to ['one', 'two']
* });
*
* async.series({
* one: function(callback) {
* setTimeout(function() {
* callback(null, 1);
* }, 200);
* },
* two: function(callback){
* setTimeout(function() {
* callback(null, 2);
* }, 100);
* }
* }, function(err, results) {
* // results is now equal to: {one: 1, two: 2}
* });
*/
function series(tasks, callback) {
_parallel(eachOfSeries, tasks, callback);
}
/**
* Returns `true` if at least one element in the `coll` satisfies an async test.
* If any iteratee call returns `true`, the main `callback` is immediately
* called.
*
* @name some
* @static
* @memberOf module:Collections
* @method
* @alias any
* @category Collection
* @param {Array|Iterable|Object} coll - A collection to iterate over.
* @param {Function} iteratee - A truth test to apply to each item in the array
* in parallel. The iteratee is passed a `callback(err, truthValue)` which must
* be called with a boolean argument once it has completed. Invoked with
* (item, callback).
* @param {Function} [callback] - A callback which is called as soon as any
* iteratee returns `true`, or after all the iteratee functions have finished.
* Result will be either `true` or `false` depending on the values of the async
* tests. Invoked with (err, result).
* @example
*
* async.some(['file1','file2','file3'], function(filePath, callback) {
* fs.access(filePath, function(err) {
* callback(null, !err)
* });
* }, function(err, result) {
* // if result is true then at least one of the files exists
* });
*/
var some = _createTester(eachOf, Boolean, identity);
/**
* The same as [`some`]{@link module:Collections.some} but runs a maximum of `limit` async operations at a time.
*
* @name someLimit
* @static
* @memberOf module:Collections
* @method
* @see [async.some]{@link module:Collections.some}
* @alias anyLimit
* @category Collection
* @param {Array|Iterable|Object} coll - A collection to iterate over.
* @param {number} limit - The maximum number of async operations at a time.
* @param {Function} iteratee - A truth test to apply to each item in the array
* in parallel. The iteratee is passed a `callback(err, truthValue)` which must
* be called with a boolean argument once it has completed. Invoked with
* (item, callback).
* @param {Function} [callback] - A callback which is called as soon as any
* iteratee returns `true`, or after all the iteratee functions have finished.
* Result will be either `true` or `false` depending on the values of the async
* tests. Invoked with (err, result).
*/
var someLimit = _createTester(eachOfLimit, Boolean, identity);
/**
* The same as [`some`]{@link module:Collections.some} but runs only a single async operation at a time.
*
* @name someSeries
* @static
* @memberOf module:Collections
* @method
* @see [async.some]{@link module:Collections.some}
* @alias anySeries
* @category Collection
* @param {Array|Iterable|Object} coll - A collection to iterate over.
* @param {Function} iteratee - A truth test to apply to each item in the array
* in parallel. The iteratee is passed a `callback(err, truthValue)` which must
* be called with a boolean argument once it has completed. Invoked with
* (item, callback).
* @param {Function} [callback] - A callback which is called as soon as any
* iteratee returns `true`, or after all the iteratee functions have finished.
* Result will be either `true` or `false` depending on the values of the async
* tests. Invoked with (err, result).
*/
var someSeries = doLimit(someLimit, 1);
/**
* Sorts a list by the results of running each `coll` value through an async
* `iteratee`.
*
* @name sortBy
* @static
* @memberOf module:Collections
* @method
* @category Collection
* @param {Array|Iterable|Object} coll - A collection to iterate over.
* @param {Function} iteratee - A function to apply to each item in `coll`.
* The iteratee is passed a `callback(err, sortValue)` which must be called once
* it has completed with an error (which can be `null`) and a value to use as
* the sort criteria. Invoked with (item, callback).
* @param {Function} callback - A callback which is called after all the
* `iteratee` functions have finished, or an error occurs. Results is the items
* from the original `coll` sorted by the values returned by the `iteratee`
* calls. Invoked with (err, results).
* @example
*
* async.sortBy(['file1','file2','file3'], function(file, callback) {
* fs.stat(file, function(err, stats) {
* callback(err, stats.mtime);
* });
* }, function(err, results) {
* // results is now the original array of files sorted by
* // modified date
* });
*
* // By modifying the callback parameter the
* // sorting order can be influenced:
*
* // ascending order
* async.sortBy([1,9,3,5], function(x, callback) {
* callback(null, x);
* }, function(err,result) {
* // result callback
* });
*
* // descending order
* async.sortBy([1,9,3,5], function(x, callback) {
* callback(null, x*-1); //<- x*-1 instead of x, turns the order around
* }, function(err,result) {
* // result callback
* });
*/
function sortBy(coll, iteratee, callback) {
map(coll, function (x, callback) {
iteratee(x, function (err, criteria) {
if (err) return callback(err);
callback(null, { value: x, criteria: criteria });
});
}, function (err, results) {
if (err) return callback(err);
callback(null, arrayMap(results.sort(comparator), baseProperty('value')));
});
function comparator(left, right) {
var a = left.criteria,
b = right.criteria;
return a < b ? -1 : a > b ? 1 : 0;
}
}
/**
* Sets a time limit on an asynchronous function. If the function does not call
* its callback within the specified milliseconds, it will be called with a
* timeout error. The code property for the error object will be `'ETIMEDOUT'`.
*
* @name timeout
* @static
* @memberOf module:Utils
* @method
* @category Util
* @param {Function} asyncFn - The asynchronous function you want to set the
* time limit.
* @param {number} milliseconds - The specified time limit.
* @param {*} [info] - Any variable you want attached (`string`, `object`, etc)
* to timeout Error for more information..
* @returns {Function} Returns a wrapped function that can be used with any of
* the control flow functions.
* @example
*
* async.timeout(function(callback) {
* doAsyncTask(callback);
* }, 1000);
*/
function timeout(asyncFn, milliseconds, info) {
var originalCallback, timer;
var timedOut = false;
function injectedCallback() {
if (!timedOut) {
originalCallback.apply(null, arguments);
clearTimeout(timer);
}
}
function timeoutCallback() {
var name = asyncFn.name || 'anonymous';
var error = new Error('Callback function "' + name + '" timed out.');
error.code = 'ETIMEDOUT';
if (info) {
error.info = info;
}
timedOut = true;
originalCallback(error);
}
return initialParams(function (args, origCallback) {
originalCallback = origCallback;
// setup timer and call original function
timer = setTimeout(timeoutCallback, milliseconds);
asyncFn.apply(null, args.concat(injectedCallback));
});
}
/* Built-in method references for those with the same name as other `lodash` methods. */
var nativeCeil = Math.ceil;
var nativeMax$1 = Math.max;
/**
* The base implementation of `_.range` and `_.rangeRight` which doesn't
* coerce arguments to numbers.
*
* @private
* @param {number} start The start of the range.
* @param {number} end The end of the range.
* @param {number} step The value to increment or decrement by.
* @param {boolean} [fromRight] Specify iterating from right to left.
* @returns {Array} Returns the range of numbers.
*/
function baseRange(start, end, step, fromRight) {
var index = -1,
length = nativeMax$1(nativeCeil((end - start) / (step || 1)), 0),
result = Array(length);
while (length--) {
result[fromRight ? length : ++index] = start;
start += step;
}
return result;
}
/**
* The same as [times]{@link module:ControlFlow.times} but runs a maximum of `limit` async operations at a
* time.
*
* @name timesLimit
* @static
* @memberOf module:ControlFlow
* @method
* @see [async.times]{@link module:ControlFlow.times}
* @category Control Flow
* @param {number} count - The number of times to run the function.
* @param {number} limit - The maximum number of async operations at a time.
* @param {Function} iteratee - The function to call `n` times. Invoked with the
* iteration index and a callback (n, next).
* @param {Function} callback - see [async.map]{@link module:Collections.map}.
*/
function timeLimit(count, limit, iteratee, callback) {
mapLimit(baseRange(0, count, 1), limit, iteratee, callback);
}
/**
* Calls the `iteratee` function `n` times, and accumulates results in the same
* manner you would use with [map]{@link module:Collections.map}.
*
* @name times
* @static
* @memberOf module:ControlFlow
* @method
* @see [async.map]{@link module:Collections.map}
* @category Control Flow
* @param {number} n - The number of times to run the function.
* @param {Function} iteratee - The function to call `n` times. Invoked with the
* iteration index and a callback (n, next).
* @param {Function} callback - see {@link module:Collections.map}.
* @example
*
* // Pretend this is some complicated async factory
* var createUser = function(id, callback) {
* callback(null, {
* id: 'user' + id
* });
* };
*
* // generate 5 users
* async.times(5, function(n, next) {
* createUser(n, function(err, user) {
* next(err, user);
* });
* }, function(err, users) {
* // we should now have 5 users
* });
*/
var times = doLimit(timeLimit, Infinity);
/**
* The same as [times]{@link module:ControlFlow.times} but runs only a single async operation at a time.
*
* @name timesSeries
* @static
* @memberOf module:ControlFlow
* @method
* @see [async.times]{@link module:ControlFlow.times}
* @category Control Flow
* @param {number} n - The number of times to run the function.
* @param {Function} iteratee - The function to call `n` times. Invoked with the
* iteration index and a callback (n, next).
* @param {Function} callback - see {@link module:Collections.map}.
*/
var timesSeries = doLimit(timeLimit, 1);
/**
* A relative of `reduce`. Takes an Object or Array, and iterates over each
* element in series, each step potentially mutating an `accumulator` value.
* The type of the accumulator defaults to the type of collection passed in.
*
* @name transform
* @static
* @memberOf module:Collections
* @method
* @category Collection
* @param {Array|Iterable|Object} coll - A collection to iterate over.
* @param {*} [accumulator] - The initial state of the transform. If omitted,
* it will default to an empty Object or Array, depending on the type of `coll`
* @param {Function} iteratee - A function applied to each item in the
* collection that potentially modifies the accumulator. The `iteratee` is
* passed a `callback(err)` which accepts an optional error as its first
* argument. If an error is passed to the callback, the transform is stopped
* and the main `callback` is immediately called with the error.
* Invoked with (accumulator, item, key, callback).
* @param {Function} [callback] - A callback which is called after all the
* `iteratee` functions have finished. Result is the transformed accumulator.
* Invoked with (err, result).
* @example
*
* async.transform([1,2,3], function(acc, item, index, callback) {
* // pointless async:
* process.nextTick(function() {
* acc.push(item * 2)
* callback(null)
* });
* }, function(err, result) {
* // result is now equal to [2, 4, 6]
* });
*
* @example
*
* async.transform({a: 1, b: 2, c: 3}, function (obj, val, key, callback) {
* setImmediate(function () {
* obj[key] = val * 2;
* callback();
* })
* }, function (err, result) {
* // result is equal to {a: 2, b: 4, c: 6}
* })
*/
function transform(coll, accumulator, iteratee, callback) {
if (arguments.length === 3) {
callback = iteratee;
iteratee = accumulator;
accumulator = isArray(coll) ? [] : {};
}
callback = once(callback || noop);
eachOf(coll, function (v, k, cb) {
iteratee(accumulator, v, k, cb);
}, function (err) {
callback(err, accumulator);
});
}
/**
* Undoes a [memoize]{@link module:Utils.memoize}d function, reverting it to the original,
* unmemoized form. Handy for testing.
*
* @name unmemoize
* @static
* @memberOf module:Utils
* @method
* @see [async.memoize]{@link module:Utils.memoize}
* @category Util
* @param {Function} fn - the memoized function
* @returns {Function} a function that calls the original unmemoized function
*/
function unmemoize(fn) {
return function () {
return (fn.unmemoized || fn).apply(null, arguments);
};
}
/**
* Repeatedly call `fn`, while `test` returns `true`. Calls `callback` when
* stopped, or an error occurs.
*
* @name whilst
* @static
* @memberOf module:ControlFlow
* @method
* @category Control Flow
* @param {Function} test - synchronous truth test to perform before each
* execution of `fn`. Invoked with ().
* @param {Function} iteratee - A function which is called each time `test` passes.
* The function is passed a `callback(err)`, which must be called once it has
* completed with an optional `err` argument. Invoked with (callback).
* @param {Function} [callback] - A callback which is called after the test
* function has failed and repeated execution of `fn` has stopped. `callback`
* will be passed an error and any arguments passed to the final `fn`'s
* callback. Invoked with (err, [results]);
* @returns undefined
* @example
*
* var count = 0;
* async.whilst(
* function() { return count < 5; },
* function(callback) {
* count++;
* setTimeout(function() {
* callback(null, count);
* }, 1000);
* },
* function (err, n) {
* // 5 seconds have passed, n = 5
* }
* );
*/
function whilst(test, iteratee, callback) {
callback = onlyOnce(callback || noop);
if (!test()) return callback(null);
var next = rest(function (err, args) {
if (err) return callback(err);
if (test()) return iteratee(next);
callback.apply(null, [null].concat(args));
});
iteratee(next);
}
/**
* Repeatedly call `fn` until `test` returns `true`. Calls `callback` when
* stopped, or an error occurs. `callback` will be passed an error and any
* arguments passed to the final `fn`'s callback.
*
* The inverse of [whilst]{@link module:ControlFlow.whilst}.
*
* @name until
* @static
* @memberOf module:ControlFlow
* @method
* @see [async.whilst]{@link module:ControlFlow.whilst}
* @category Control Flow
* @param {Function} test - synchronous truth test to perform before each
* execution of `fn`. Invoked with ().
* @param {Function} fn - A function which is called each time `test` fails.
* The function is passed a `callback(err)`, which must be called once it has
* completed with an optional `err` argument. Invoked with (callback).
* @param {Function} [callback] - A callback which is called after the test
* function has passed and repeated execution of `fn` has stopped. `callback`
* will be passed an error and any arguments passed to the final `fn`'s
* callback. Invoked with (err, [results]);
*/
function until(test, fn, callback) {
whilst(function () {
return !test.apply(this, arguments);
}, fn, callback);
}
/**
* Runs the `tasks` array of functions in series, each passing their results to
* the next in the array. However, if any of the `tasks` pass an error to their
* own callback, the next function is not executed, and the main `callback` is
* immediately called with the error.
*
* @name waterfall
* @static
* @memberOf module:ControlFlow
* @method
* @category Control Flow
* @param {Array} tasks - An array of functions to run, each function is passed
* a `callback(err, result1, result2, ...)` it must call on completion. The
* first argument is an error (which can be `null`) and any further arguments
* will be passed as arguments in order to the next task.
* @param {Function} [callback] - An optional callback to run once all the
* functions have completed. This will be passed the results of the last task's
* callback. Invoked with (err, [results]).
* @returns undefined
* @example
*
* async.waterfall([
* function(callback) {
* callback(null, 'one', 'two');
* },
* function(arg1, arg2, callback) {
* // arg1 now equals 'one' and arg2 now equals 'two'
* callback(null, 'three');
* },
* function(arg1, callback) {
* // arg1 now equals 'three'
* callback(null, 'done');
* }
* ], function (err, result) {
* // result now equals 'done'
* });
*
* // Or, with named functions:
* async.waterfall([
* myFirstFunction,
* mySecondFunction,
* myLastFunction,
* ], function (err, result) {
* // result now equals 'done'
* });
* function myFirstFunction(callback) {
* callback(null, 'one', 'two');
* }
* function mySecondFunction(arg1, arg2, callback) {
* // arg1 now equals 'one' and arg2 now equals 'two'
* callback(null, 'three');
* }
* function myLastFunction(arg1, callback) {
* // arg1 now equals 'three'
* callback(null, 'done');
* }
*/
function waterfall (tasks, callback) {
callback = once(callback || noop);
if (!isArray(tasks)) return callback(new Error('First argument to waterfall must be an array of functions'));
if (!tasks.length) return callback();
var taskIndex = 0;
function nextTask(args) {
if (taskIndex === tasks.length) {
return callback.apply(null, [null].concat(args));
}
var taskCallback = onlyOnce(rest(function (err, args) {
if (err) {
return callback.apply(null, [err].concat(args));
}
nextTask(args);
}));
args.push(taskCallback);
var task = tasks[taskIndex++];
task.apply(null, args);
}
nextTask([]);
}
var index = {
applyEach: applyEach,
applyEachSeries: applyEachSeries,
apply: apply$1,
asyncify: asyncify,
auto: auto,
autoInject: autoInject,
cargo: cargo,
compose: compose,
concat: concat,
concatSeries: concatSeries,
constant: constant,
detect: detect,
detectLimit: detectLimit,
detectSeries: detectSeries,
dir: dir,
doDuring: doDuring,
doUntil: doUntil,
doWhilst: doWhilst,
during: during,
each: eachLimit,
eachLimit: eachLimit$1,
eachOf: eachOf,
eachOfLimit: eachOfLimit,
eachOfSeries: eachOfSeries,
eachSeries: eachSeries,
ensureAsync: ensureAsync,
every: every,
everyLimit: everyLimit,
everySeries: everySeries,
filter: filter,
filterLimit: filterLimit,
filterSeries: filterSeries,
forever: forever,
log: log,
map: map,
mapLimit: mapLimit,
mapSeries: mapSeries,
mapValues: mapValues,
mapValuesLimit: mapValuesLimit,
mapValuesSeries: mapValuesSeries,
memoize: memoize,
nextTick: nextTick,
parallel: parallelLimit,
parallelLimit: parallelLimit$1,
priorityQueue: priorityQueue,
queue: queue$1,
race: race,
reduce: reduce,
reduceRight: reduceRight,
reflect: reflect,
reflectAll: reflectAll,
reject: reject,
rejectLimit: rejectLimit,
rejectSeries: rejectSeries,
retry: retry,
retryable: retryable,
seq: seq,
series: series,
setImmediate: setImmediate$1,
some: some,
someLimit: someLimit,
someSeries: someSeries,
sortBy: sortBy,
timeout: timeout,
times: times,
timesLimit: timeLimit,
timesSeries: timesSeries,
transform: transform,
unmemoize: unmemoize,
until: until,
waterfall: waterfall,
whilst: whilst,
// aliases
all: every,
any: some,
forEach: eachLimit,
forEachSeries: eachSeries,
forEachLimit: eachLimit$1,
forEachOf: eachOf,
forEachOfSeries: eachOfSeries,
forEachOfLimit: eachOfLimit,
inject: reduce,
foldl: reduce,
foldr: reduceRight,
select: filter,
selectLimit: filterLimit,
selectSeries: filterSeries,
wrapSync: asyncify
};
exports['default'] = index;
exports.applyEach = applyEach;
exports.applyEachSeries = applyEachSeries;
exports.apply = apply$1;
exports.asyncify = asyncify;
exports.auto = auto;
exports.autoInject = autoInject;
exports.cargo = cargo;
exports.compose = compose;
exports.concat = concat;
exports.concatSeries = concatSeries;
exports.constant = constant;
exports.detect = detect;
exports.detectLimit = detectLimit;
exports.detectSeries = detectSeries;
exports.dir = dir;
exports.doDuring = doDuring;
exports.doUntil = doUntil;
exports.doWhilst = doWhilst;
exports.during = during;
exports.each = eachLimit;
exports.eachLimit = eachLimit$1;
exports.eachOf = eachOf;
exports.eachOfLimit = eachOfLimit;
exports.eachOfSeries = eachOfSeries;
exports.eachSeries = eachSeries;
exports.ensureAsync = ensureAsync;
exports.every = every;
exports.everyLimit = everyLimit;
exports.everySeries = everySeries;
exports.filter = filter;
exports.filterLimit = filterLimit;
exports.filterSeries = filterSeries;
exports.forever = forever;
exports.log = log;
exports.map = map;
exports.mapLimit = mapLimit;
exports.mapSeries = mapSeries;
exports.mapValues = mapValues;
exports.mapValuesLimit = mapValuesLimit;
exports.mapValuesSeries = mapValuesSeries;
exports.memoize = memoize;
exports.nextTick = nextTick;
exports.parallel = parallelLimit;
exports.parallelLimit = parallelLimit$1;
exports.priorityQueue = priorityQueue;
exports.queue = queue$1;
exports.race = race;
exports.reduce = reduce;
exports.reduceRight = reduceRight;
exports.reflect = reflect;
exports.reflectAll = reflectAll;
exports.reject = reject;
exports.rejectLimit = rejectLimit;
exports.rejectSeries = rejectSeries;
exports.retry = retry;
exports.retryable = retryable;
exports.seq = seq;
exports.series = series;
exports.setImmediate = setImmediate$1;
exports.some = some;
exports.someLimit = someLimit;
exports.someSeries = someSeries;
exports.sortBy = sortBy;
exports.timeout = timeout;
exports.times = times;
exports.timesLimit = timeLimit;
exports.timesSeries = timesSeries;
exports.transform = transform;
exports.unmemoize = unmemoize;
exports.until = until;
exports.waterfall = waterfall;
exports.whilst = whilst;
exports.all = every;
exports.allLimit = everyLimit;
exports.allSeries = everySeries;
exports.any = some;
exports.anyLimit = someLimit;
exports.anySeries = someSeries;
exports.find = detect;
exports.findLimit = detectLimit;
exports.findSeries = detectSeries;
exports.forEach = eachLimit;
exports.forEachSeries = eachSeries;
exports.forEachLimit = eachLimit$1;
exports.forEachOf = eachOf;
exports.forEachOfSeries = eachOfSeries;
exports.forEachOfLimit = eachOfLimit;
exports.inject = reduce;
exports.foldl = reduce;
exports.foldr = reduceRight;
exports.select = filter;
exports.selectLimit = filterLimit;
exports.selectSeries = filterSeries;
exports.wrapSync = asyncify;
}));