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'use strict';
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.default = function (tasks, concurrency, callback) {
if (typeof arguments[1] === 'function') {
// concurrency is optional, shift the args.
callback = concurrency;
concurrency = null;
}
callback = (0, _once2.default)(callback || _noop2.default);
var keys = (0, _keys2.default)(tasks);
var remainingTasks = keys.length;
if (!remainingTasks) {
return callback(null);
}
if (!concurrency) {
concurrency = remainingTasks;
}
var results = {};
var runningTasks = 0;
var hasError = false;
var listeners = [];
function addListener(fn) {
listeners.unshift(fn);
}
function removeListener(fn) {
var idx = (0, _indexOf2.default)(listeners, fn);
if (idx >= 0) listeners.splice(idx, 1);
}
function taskComplete() {
remainingTasks--;
(0, _arrayEach2.default)(listeners.slice(), function (fn) {
fn();
});
}
addListener(function () {
if (!remainingTasks) {
callback(null, results);
}
});
(0, _arrayEach2.default)(keys, function (k) {
if (hasError) return;
var task = (0, _isArray2.default)(tasks[k]) ? tasks[k] : [tasks[k]];
var taskCallback = (0, _rest2.default)(function (err, args) {
runningTasks--;
if (args.length <= 1) {
args = args[0];
}
if (err) {
var safeResults = {};
(0, _forOwn2.default)(results, function (val, rkey) {
safeResults[rkey] = val;
});
safeResults[k] = args;
hasError = true;
callback(err, safeResults);
} else {
results[k] = args;
(0, _setImmediate2.default)(taskComplete);
}
});
var requires = task.slice(0, task.length - 1);
// prevent dead-locks
var len = requires.length;
var dep;
while (len--) {
if (!(dep = tasks[requires[len]])) {
throw new Error('Has non-existent dependency in ' + requires.join(', '));
}
if ((0, _isArray2.default)(dep) && (0, _indexOf2.default)(dep, k) >= 0) {
throw new Error('Has cyclic dependencies');
}
}
function ready() {
return runningTasks < concurrency && !(0, _baseHas2.default)(results, k) && (0, _arrayEvery2.default)(requires, function (x) {
return (0, _baseHas2.default)(results, x);
});
}
if (ready()) {
runningTasks++;
task[task.length - 1](taskCallback, results);
} else {
addListener(listener);
}
function listener() {
if (ready()) {
runningTasks++;
removeListener(listener);
task[task.length - 1](taskCallback, results);
}
}
});
};
var _arrayEach = require('lodash/_arrayEach');
var _arrayEach2 = _interopRequireDefault(_arrayEach);
var _arrayEvery = require('lodash/_arrayEvery');
var _arrayEvery2 = _interopRequireDefault(_arrayEvery);
var _baseHas = require('lodash/_baseHas');
var _baseHas2 = _interopRequireDefault(_baseHas);
var _forOwn = require('lodash/forOwn');
var _forOwn2 = _interopRequireDefault(_forOwn);
var _indexOf = require('lodash/indexOf');
var _indexOf2 = _interopRequireDefault(_indexOf);
var _isArray = require('lodash/isArray');
var _isArray2 = _interopRequireDefault(_isArray);
var _keys = require('lodash/keys');
var _keys2 = _interopRequireDefault(_keys);
var _noop = require('lodash/noop');
var _noop2 = _interopRequireDefault(_noop);
var _once = require('lodash/once');
var _once2 = _interopRequireDefault(_once);
var _rest = require('lodash/rest');
var _rest2 = _interopRequireDefault(_rest);
var _setImmediate = require('./internal/setImmediate');
var _setImmediate2 = _interopRequireDefault(_setImmediate);
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
module.exports = exports['default'];
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