js-sync-back/index.js at master · lsby/js-sync-back · GitHub

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module.exports = function (opt) {
	opt = opt || { debug: true }
	var debug = opt.debug

	return function (f, back) {
		var api = {
			next: function (err, data) {
				if (err) {
					_debugOut(err)
					fx.throw(err)
				}

				step(data)
			},
			nextOne: function (data) {
				step(data)
			}
		}
		var fx = f(api)
		step()

		function step(data) {
			setTimeout(function () {
				try {
					var c = fx.next(data)
					if (c.done == true)
						_back(null, c.value)
				} catch (err) {
					_debugOut(err)
					_back(err)
				}
			}, 0)
		}
		function _back(err, data) {
			if (back != null)
				back(err, data)
		}
		function _debugOut(err) {
			if (debug)
				console.error(err)
		}
	}
}