90 lines
2.4 KiB
JavaScript
90 lines
2.4 KiB
JavaScript
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"use strict";
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module.exports = function(Promise, INTERNAL) {
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var util = require("./util.js");
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var errorObj = util.errorObj;
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var isObject = util.isObject;
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function tryConvertToPromise(obj, context) {
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if (isObject(obj)) {
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if (obj instanceof Promise) {
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return obj;
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}
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else if (isAnyBluebirdPromise(obj)) {
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var ret = new Promise(INTERNAL);
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obj._then(
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ret._fulfillUnchecked,
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ret._rejectUncheckedCheckError,
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ret._progressUnchecked,
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ret,
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null
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);
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return ret;
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}
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var then = util.tryCatch(getThen)(obj);
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if (then === errorObj) {
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if (context) context._pushContext();
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var ret = Promise.reject(then.e);
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if (context) context._popContext();
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return ret;
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} else if (typeof then === "function") {
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return doThenable(obj, then, context);
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}
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}
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return obj;
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}
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function getThen(obj) {
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return obj.then;
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}
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var hasProp = {}.hasOwnProperty;
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function isAnyBluebirdPromise(obj) {
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return hasProp.call(obj, "_promise0");
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}
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function doThenable(x, then, context) {
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var promise = new Promise(INTERNAL);
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var ret = promise;
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if (context) context._pushContext();
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promise._captureStackTrace();
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if (context) context._popContext();
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var synchronous = true;
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var result = util.tryCatch(then).call(x,
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resolveFromThenable,
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rejectFromThenable,
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progressFromThenable);
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synchronous = false;
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if (promise && result === errorObj) {
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promise._rejectCallback(result.e, true, true);
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promise = null;
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}
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function resolveFromThenable(value) {
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if (!promise) return;
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if (x === value) {
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promise._rejectCallback(
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Promise._makeSelfResolutionError(), false, true);
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} else {
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promise._resolveCallback(value);
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}
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promise = null;
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}
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function rejectFromThenable(reason) {
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if (!promise) return;
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promise._rejectCallback(reason, synchronous, true);
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promise = null;
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}
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function progressFromThenable(value) {
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if (!promise) return;
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if (typeof promise._progress === "function") {
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promise._progress(value);
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}
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}
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return ret;
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}
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return tryConvertToPromise;
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};
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