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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 | var isPromise = function (value) {
return value && typeof value.then === "function";
};
var defer = function () {
var pending = [], value;
return {
resolve: function (_value) {
if (pending) {
value = ref(_value);
for (var i = 0, ii = pending.length; i < ii; i++) {
// apply the pending arguments to "then"
value.then.apply(value, pending[i]);
}
pending = undefined;
}
},
promise: {
then: function (_callback, _errback) {
var result = defer();
var callback = function (value) {
result.resolve(_callback(value));
};
var errback = function (reason) {
result.resolve(_errback(reason));
};
if (pending) {
pending.push([callback, errback]);
} else {
value.then(callback, errback);
}
return result.promise;
}
}
};
};
var ref = function (value) {
if (value && typeof value.then === "function")
return value;
return {
then: function (callback) {
return ref(callback(value));
}
};
};
var reject = function (reason) {
return {
then: function (callback, errback) {
return ref(errback(reason));
}
};
};
|