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IPromise.js
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IPromise.js
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function IPromise() {
'use strict';
var Promise = function Promise(id, context, byForce) {
if (!byForce && Promise.instances[id]) {
return Promise.instances[id];
}
var pendeing = {status: 'pendeing'};
var error = {status: 'rejected'};
var future_value = pendeing;
var done = [];
var broke = [];
var promise;
function setStatus(is_resolved, newValue) {
if (future_value !== pendeing) { return promise; }
if (is_resolved) {
future_value = newValue;
} else {
error.data = newValue;
future_value = error;
}
return invoke(is_resolved ? done : broke);
}
function callToFutureValue(callTo, ctx) {
if (callTo) {
if (future_value.isBreaker && future_value.isBreaker() === 'breaker') {
future_value.push(promise);
invoke.lastValue = callTo[0].apply(callTo[1] || ctx, future_value);
future_value.pop();
} else {
invoke.lastValue = callTo[0].call(callTo[1] || ctx, future_value, promise);
}
future_value = invoke.lastValue !== undefined ? invoke.lastValue : future_value;
}
}
function invoke(callbacks, ctx) {
function next() {
if (arguments.length) {
future_value = Promise.argsArray(Array.prototype.slice.call(arguments, 0, arguments.length - 1));
}
setTimeout(function () {
callToFutureValue(callbacks[invoke.index++], ctx);
if (invoke.index < callbacks.length) {
if (invoke.lastValue && invoke.lastValue.type === 'Promise') {
return invoke.lastValue.always(next);
}
next();
} else {
invoke.index = -1;
done.length = 0;
broke.length = 0;
}
}, 0);
}
if (invoke.index === -1 && callbacks.length) {
ctx = context || promise;
invoke.index++;
next();
}
return promise;
}
invoke.index = -1;
invoke.lastValue = undefined;
promise = {
constructor: Promise,
type: 'Promise',
id: id ? id.toString() : 'anonymous',
status: function () {
if (future_value === pendeing) { return 'pendeing'; }
if (future_value === error) { return 'rejected'; }
return 'resolved';
},
then: function (sxs, fail, context) {
if(sxs) {done.push([sxs, context]);}
if(fail) {broke.push([fail, context]);}
if (promise.status() === 'pendeing') { return promise;}
return invoke(promise.status() === 'rejected' ? broke : done);
},
fail: function (fail, context) { return promise.then(null, fail, context); },
done: function (sxs, context) { return promise.then(sxs, null, context); },
always: function (always, context) { return promise.then(always, always, context); },
timeout: function (time, errorData) {
setTimeout(promise.reject.$with(errorData), time);
return promise;
}
};
promise.resolve = setStatus.bind(promise, true);
promise.reject = setStatus.bind(promise, false);
promise.resolve.$with = function (value) {
return promise.resolve.bind(null, value);
};
promise.reject.$with = function (value) {
return promise.reject.bind(null, value);
};
return Promise.store(id, promise);
};
Promise.instances = {};
Promise.store = function (id, promise) {
if (id !== undefined && id !== null) {
Promise.instances[id] = promise;
}
return promise;
};
Promise.when = function (id, promises, context) {
promises = promises || [];
var values = Promise.argsArray();
var was_error = false;
var i;
var whenPromise = Promise(id, context);
if (!promises.length) {
return whenPromise.resolve(values);
}
var advanceWhenState = function (promise, value) {
if (promise.status() === 'rejected') {
was_error = true;
}
values.push(value);
if (promises.length === values.length) {
return was_error ? whenPromise.reject(values) : whenPromise.resolve(values);
}
return undefined;
};
for (i = 0; i < promises.length; i++) {
promises[i].always(advanceWhenState.bind(null, promises[i]), context);
}
return whenPromise;
};
Promise.argsArray = function (array) {
var args = array || [];
args.isBreaker = function () {
return 'breaker';
};
return args;
};
if (!Promise.name) {
Promise.name = 'Promise';
} //IE Fix
return Promise;
}