[Pkg-mozext-commits] [tabmixplus] 22/61: New module AsyncUtils.jsm to help use callbacks as promises

[David Prévot]

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taffit pushed a commit to branch master
in repository tabmixplus.

commit bbaab28ada0b7e9707ae6f0026fc991af4360163
Author: onemen <tabmix.onemen at gmail.com>
Date:   Tue Jul 21 21:13:47 2015 +0300

    New module AsyncUtils.jsm to help use callbacks as promises
---
 modules/AsyncUtils.jsm | 59 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)

diff --git a/modules/AsyncUtils.jsm b/modules/AsyncUtils.jsm
new file mode 100644
index 0000000..30b1a52
--- /dev/null
+++ b/modules/AsyncUtils.jsm
@@ -0,0 +1,59 @@
+/* jshint esnext: true */
+"use strict";
+
+var EXPORTED_SYMBOLS = ["AsyncUtils"];
+
+const Cu = Components.utils;
+
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+
+XPCOMUtils.defineLazyModuleGetter(this, "Promise",
+                                  "resource://gre/modules/Promise.jsm");
+
+XPCOMUtils.defineLazyModuleGetter(this, "TabmixSvc",
+                                  "resource://tabmixplus/Services.jsm");
+this.AsyncUtils = {
+  /* PromiseUtils.defer exsit since Firefox 39 */
+  defer : function() {
+    return new Deferred();
+  },
+
+  spawnFn: function(thisArg, fn, index) {
+    return this.promisify(thisArg, fn, index).call(undefined);
+  },
+
+  asyncFn: function(thisArg, fn, index) {
+    return this.promisify(thisArg, fn, index);
+  },
+
+  promisify: function(thisArg, fn, index) {
+    return function() {
+      let deferred = new Deferred();
+      let args = Array.slice(arguments);
+      if (typeof index == "undefined")
+        index = args.length;
+      args.splice(index, 0, deferred.callback);
+
+      try {
+        fn.apply(thisArg, args);
+      } catch(ex) {
+        deferred.reject(ex);
+      }
+      return deferred.promise;
+    };
+  }
+};
+
+function Deferred() {
+  this.resolve = null;
+  this.reject = null;
+  this.callback = (result, error) => {
+    if (error)
+      return this.reject(error);
+    return this.resolve(result);
+  };
+  this.promise = new Promise((resolve, reject) => {
+    this.resolve = resolve;
+    this.reject = reject;
+  });
+}

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