added support for counting down using the "numbers" reporter

HISTORY.md

@@ -3,11 +3,15 @@
 ## in development:
 * **New Features:**
 * **Notable Changes:**
+    * added support for counting down using the "numbers" reporter
 * **Notable Fixes:**
     * optimized performance for backgrounds and pen trails
     * removed "current" option from "switch to costume" block's drop-down menu
 * **Translation Updates:**
 
+### 2019-10-29
+* threads: added support for counting down using the "numbers" reporter
+
 ### 2019-10-28
 * new dev version
 * morphic: enable recycling and deep copying canvas elements

snap.html

@@ -7,7 +7,7 @@
         <script type="text/javascript" src="src/morphic.js?version=2019-10-28"></script>
         <script type="text/javascript" src="src/widgets.js?version=2019-10-16"></script>
         <script type="text/javascript" src="src/blocks.js?version=2019-10-28"></script>
-        <script type="text/javascript" src="src/threads.js?version=2019-10-25"></script>
+        <script type="text/javascript" src="src/threads.js?version=2019-10-29"></script>
         <script type="text/javascript" src="src/objects.js?version=2019-10-28"></script>
         <script type="text/javascript" src="src/gui.js?version=2019-10-28"></script>
         <script type="text/javascript" src="src/paint.js?version=2019-06-27"></script>

src/threads.js

@@ -61,7 +61,7 @@ StageMorph, SpriteMorph, StagePrompterMorph, Note, modules, isString, copy,
 isNil, WatcherMorph, List, ListWatcherMorph, alert, console, TableMorph, Color,
 TableFrameMorph, ColorSlotMorph, isSnapObject, Map, newCanvas, Symbol*/
 
-modules.threads = '2019-October-25';
+modules.threads = '2019-October-29';
 
 var ThreadManager;
 var Process;
@@ -1838,20 +1838,21 @@ Process.prototype.reportNumbers = function (start, end) {
         this.context.accumulator = {
             target : new List(),
             end : null,
-            idx : +start
+            idx : +start,
+            step: +end > +start ? +1 : -1
         };
         this.context.accumulator.target.isLinked = true;
         this.context.accumulator.end = this.context.accumulator.target;
     }
     dta = this.context.accumulator;
-    if (dta.idx > +end) {
+    if (dta.step === 1 ? dta.idx > +end : dta.idx < +end) {
         dta.end.rest = new List();
         this.returnValueToParentContext(dta.target.cdr());
         return;
     }
     dta.end.rest = dta.target.cons(dta.idx);
     dta.end = dta.end.rest;
-    dta.idx += 1;
+    dta.idx += dta.step;
     this.pushContext();
 };