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// Assimilate eventual foreign promise
"use strict";
var isObject = require("es5-ext/object/is-object")
, isPromise = require("./is-promise")
, deferred = require("./deferred")
, nextTick = require("next-tick");
var getPrototypeOf = Object.getPrototypeOf;
module.exports = function self(value) {
var then, done, def, resolve, reject;
if (!value) return value;
try { then = value.then; }
catch (e) { return value; }
if (typeof then !== "function") return value;
if (isPromise(value)) return value;
if (!isObject(value)) return value;
if (!getPrototypeOf(value)) return value;
try { done = value.done; }
catch (ignore) {}
def = deferred();
resolve = function (resolvedValue) { def.resolve(self(resolvedValue)); };
reject = function (resolvedReason) { def.reject(resolvedReason); };
if (typeof done === "function") {
try { done.call(value, resolve, reject); }
catch (e) { return def.reject(e); }
return def.promise;
}
try {
then.call(
value,
function (resolvedValue) {
nextTick(function () { resolve(resolvedValue); });
},
function (resolvedReason) {
nextTick(function () { reject(resolvedReason); });
}
);
} catch (e) {
return def.reject(e);
}
return def.promise;
};
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