From 2d736f2b871fdcec1c6cd9c063be3d72956db933 Mon Sep 17 00:00:00 2001
From: Tim Mickel <tim.mickel@gmail.com>
Date: Thu, 22 Sep 2016 17:00:38 -0400
Subject: [PATCH] "Wait until" implementation (#210)

---
 src/blocks/scratch3_control.js | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/blocks/scratch3_control.js b/src/blocks/scratch3_control.js
index 5f3370895..eab6c1a0f 100644
--- a/src/blocks/scratch3_control.js
+++ b/src/blocks/scratch3_control.js
@@ -19,6 +19,7 @@ Scratch3ControlBlocks.prototype.getPrimitives = function() {
         'control_repeat_until': this.repeatUntil,
         'control_forever': this.forever,
         'control_wait': this.wait,
+        'control_wait_until': this.waitUntil,
         'control_if': this.if,
         'control_if_else': this.ifElse,
         'control_stop': this.stop,
@@ -76,6 +77,14 @@ Scratch3ControlBlocks.prototype.repeatUntil = function(args, util) {
     }
 };
 
+Scratch3ControlBlocks.prototype.waitUntil = function(args, util) {
+    var condition = Cast.toBoolean(args.CONDITION);
+    // Only execute once per frame.
+    if (!condition) {
+        util.yieldFrame();
+    }
+};
+
 Scratch3ControlBlocks.prototype.forever = function(args, util) {
     // Only execute once per frame.
     // When the branch finishes, `forever` will be executed again and