maybe-polyfill/maybe.min.js

Promises for people afraid of commitment.

!function(t){function e(){}function n(t,e){return function(){t.apply(e,arguments)}}function o(t){if("object"!=typeof this)throw new TypeError("Maybes must be constructed via new");if("function"!=typeof t)throw new TypeError("not a function");this._state=0,this._handled=!1,this._value=void 0,this._deferreds=[],a(t,this)}function r(t,e){for(;3===t._state;)t=t._value;return 0===t._state?void t._deferreds.push(e):(t._handled=!0,void l(function(){var n=1===t._state?e.onFulfilled:e.onRejected;if(null===n)return void(1===t._state?i:u)(e.maybe,t._value);var o;try{o=n(t._value)}catch(r){return void u(e.maybe,r)}i(e.maybe,o)}))}function i(t,e){try{if(e===t)throw new TypeError("A maybe cannot be resolved with itself.");if(e&&("object"==typeof e||"function"==typeof e)){var r=e.then;if(e instanceof o)return t._state=3,t._value=e,void f(t);if("function"==typeof r)return void a(n(r,e),t)}t._state=1,t._value=e,f(t)}catch(i){u(t,i)}}function u(t,e){t._state=2,t._value=e,f(t)}function f(t){2===t._state&&0===t._deferreds.length&&setTimeout(function(){t._handled||o._onUnhandledRejection(t._value)},1);for(var e=0,n=t._deferreds.length;n>e;e++)r(t,t._deferreds[e]);t._deferreds=null}function c(t,e,n){this.onFulfilled="function"==typeof t?t:null,this.onRejected="function"==typeof e?e:null,this.maybe=n}function a(t,e){var n=!1;try{t(function(t){n||(n=!0,i(e,t))},function(t){n||(n=!0,u(e,t))})}catch(o){if(n)return;n=!0,u(e,o)}}var s=setTimeout,l="function"==typeof setImmediate&&setImmediate||function(t){s(t,1)},d=Array.isArray||function(t){return"[object Array]"===Object.prototype.toString.call(t)};o.prototype["catch"]=function(t){return this.then(null,t)},o.prototype.then=function(t,n){var i=new o(e);return r(this,new c(t,n,i)),i},o.all=function(){var t=Array.prototype.slice.call(1===arguments.length&&d(arguments[0])?arguments[0]:arguments);return new o(function(e,n){function o(i,u){try{if(u&&("object"==typeof u||"function"==typeof u)){var f=u.then;if("function"==typeof f)return void f.call(u,function(t){o(i,t)},n)}t[i]=u,0===--r&&e(t)}catch(c){n(c)}}if(0===t.length)return e([]);for(var r=t.length,i=0;i<t.length;i++)o(i,t[i])})},o.resolve=function(t){return t&&"object"==typeof t&&t.constructor===o?t:new o(function(e){e(t)})},o.reject=function(t){return new o(function(e,n){n(t)})},o.race=function(t){return new o(function(e,n){for(var o=0,r=t.length;r>o;o++)t[o].then(e,n)})},o._setImmediateFn=function(t){l=t},o._onUnhandledRejection=function(t){console.warn("Possible Unhandled maybe Rejection:",t)},"undefined"!=typeof module&&module.exports?module.exports=o:t.Maybe||(t.Maybe=o)}(this);