gerrit.onap Code Review - aai/esr-gui.git/blob

   1 "use strict";
   2 module.exports = function(Promise, INTERNAL) {
   3 var util = require("./util.js");
   4 var errorObj = util.errorObj;
   5 var isObject = util.isObject;
   6
   7 function tryConvertToPromise(obj, context) {
   8     if (isObject(obj)) {
   9         if (obj instanceof Promise) {
  10             return obj;
  11         }
  12         else if (isAnyBluebirdPromise(obj)) {
  13             var ret = new Promise(INTERNAL);
  14             obj._then(
  15                 ret._fulfillUnchecked,
  16                 ret._rejectUncheckedCheckError,
  17                 ret._progressUnchecked,
  18                 ret,
  19                 null
  20             );
  21             return ret;
  22         }
  23         var then = util.tryCatch(getThen)(obj);
  24         if (then === errorObj) {
  25             if (context) context._pushContext();
  26             var ret = Promise.reject(then.e);
  27             if (context) context._popContext();
  28             return ret;
  29         } else if (typeof then === "function") {
  30             return doThenable(obj, then, context);
  31         }
  32     }
  33     return obj;
  34 }
  35
  36 function getThen(obj) {
  37     return obj.then;
  38 }
  39
  40 var hasProp = {}.hasOwnProperty;
  41 function isAnyBluebirdPromise(obj) {
  42     return hasProp.call(obj, "_promise0");
  43 }
  44
  45 function doThenable(x, then, context) {
  46     var promise = new Promise(INTERNAL);
  47     var ret = promise;
  48     if (context) context._pushContext();
  49     promise._captureStackTrace();
  50     if (context) context._popContext();
  51     var synchronous = true;
  52     var result = util.tryCatch(then).call(x,
  53                                         resolveFromThenable,
  54                                         rejectFromThenable,
  55                                         progressFromThenable);
  56     synchronous = false;
  57     if (promise && result === errorObj) {
  58         promise._rejectCallback(result.e, true, true);
  59         promise = null;
  60     }
  61
  62     function resolveFromThenable(value) {
  63         if (!promise) return;
  64         promise._resolveCallback(value);
  65         promise = null;
  66     }
  67
  68     function rejectFromThenable(reason) {
  69         if (!promise) return;
  70         promise._rejectCallback(reason, synchronous, true);
  71         promise = null;
  72     }
  73
  74     function progressFromThenable(value) {
  75         if (!promise) return;
  76         if (typeof promise._progress === "function") {
  77             promise._progress(value);
  78         }
  79     }
  80     return ret;
  81 }
  82
  83 return tryConvertToPromise;
  84 };