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thenables.js

"use strict";
module.exports = function(Promise, INTERNAL) {
var util = require("./util");
var errorObj = util.errorObj;
var isObject = util.isObject;

function doGetThen(obj) {
    return obj.then;
}

function getThen(obj) {
    try {
        return doGetThen(obj);
    } catch (e) {
        errorObj.e = e;
        return errorObj;
    }
}

var hasProp = {}.hasOwnProperty;
function isAnyBluebirdPromise(obj) {
    try {
        return hasProp.call(obj, "_promise0");
    } catch (e) {
        return false;
    }
}

function doThenable(x, then, context) {
    var promise = new Promise(INTERNAL);
    var ret = promise;
    if (context) context._pushContext();
    promise._captureStackTrace();
    if (context) context._popContext();
    var synchronous = true;
    var result = util.tryCatch(then).call(x, resolve, reject);
    synchronous = false;

if (promise && result === errorObj) {
        promise._rejectCallback(result.e, true, true);
        promise = null;
    }

function resolve(value) {
        if (!promise) return;
        promise._resolveCallback(value);
        promise = null;
    }

function reject(reason) {
        if (!promise) return;
        promise._rejectCallback(reason, synchronous, true);
        promise = null;
    }
    return ret;
}

return tryConvertToPromise;
};

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