new extension primitive for querying all variable names accessible from a specified scope (global, sprite, script)

HISTORY.md

@@ -23,6 +23,7 @@
     * new "this script" primitive, experimental
     * new localization extension primitives in the "ide" category, hyperized
     * new extension primitive for importing a costume from a url
+    * new extension primitive for querying all variable names accessible from a specified scope (global, sprite, script)
     * new support for setting the translation via the API
     * new "Tad" and "Jahrd" costume series, thanks, Meghan and Brian!
 * **Notable Changes:**
@@ -59,6 +60,7 @@
 * threads: added support for "defaults" selector on primitives
 * threads: added support for "editables" selector on primitives
 * threads, byob: added support for "menus" selector on primitives
+* extensions: new extension primitive for querying all variable names accessible from a specified scope (global, sprite, script)
 
 ### 2022-06-28
 * blocks, byob, threads: new "menus" selector for block attributes

snap.html

@@ -28,7 +28,7 @@
         <script src="src/sketch.js?version=2021-11-03"></script>
         <script src="src/video.js?version=2019-06-27"></script>
         <script src="src/maps.js?version=2021-06-15"></script>
-        <script src="src/extensions.js?version=2022-05-28"></script>
+        <script src="src/extensions.js?version=2022-06-29"></script>
         <script src="src/xml.js?version=2021-07-05"></script>
         <script src="src/store.js?version=2022-04-26"></script>
         <script src="src/locale.js?version=2022-06-28"></script>

src/extensions.js

@@ -34,7 +34,7 @@ SVG_Costume, newCanvas, Point*/
 
 /*jshint esversion: 11, bitwise: false*/
 
-modules.extensions = '2022-May-28';
+modules.extensions = '2022-June-29';
 
 // Global stuff
 
@@ -735,6 +735,23 @@ SnapExtensions.primitives.set(
     }
 );
 
+SnapExtensions.primitives.set(
+    'var_names(scope)',
+    function (scope, proc) {
+        var frame;
+        if (scope === 'script') {
+            frame = proc.context.isInCustomBlock() ?
+                        proc.homeContext.variables
+                        : proc.context.outerContext.variables;
+        } else if (scope === 'sprite') {
+            frame = this.variables;
+        } else {
+            frame = this.globalVariables();
+        }
+        return new List(frame.allNames());
+    }
+);
+
 SnapExtensions.primitives.set(
     'var_delete(name)',
     function (name, proc) {