move isEmpty() into Kiss class

kiss/src/kiss/AsyncEmbeddedScript.hx

@@ -10,6 +10,7 @@ using kiss.Helpers;
 #end
 
 import kiss.Kiss;
+import kiss.ReaderExp;
 import kiss.Prelude;
 import kiss.cloner.Cloner;
 
@@ -178,7 +179,8 @@ class AsyncEmbeddedScript {
                 Reader.readAndProcess(Stream.fromFile(scriptFile), k, (nextExp) -> {
                     var exprString = Reader.toString(nextExp.def);
                     var expr = Kiss.readerExpToHaxeExpr(nextExp, k);
-
+                    if (Kiss.isEmpty(expr))
+                        return;
                     #if debug
                     expr = macro { Prelude.print($v{exprString}); $expr; };
                     expr = expr.expr.withMacroPosOf(nextExp);

kiss/src/kiss/Kiss.hx

@@ -399,24 +399,12 @@ class Kiss {
             // readerExpToHaxeExpr must be called to process readermacro, alias, and macro definitions
             macroUsed = false;
             var expr = readerExpToHaxeExpr(nextExp, k);
-
+            
             // exps in the loaded file that actually become haxe expressions can be inserted into the
             // file that loaded them at the position (load) was called.
             // conditional compiler macros like (#when) tend to return empty blocks, or blocks containing empty blocks
             // when they contain field forms, so this should also be ignored
-            function isEmpty(expr) {
-                switch (expr.expr) {
-                    case EBlock([]):
-                    case EBlock(blockExps):
-                        for (exp in blockExps) {
-                            if (!isEmpty(exp))
-                                return false;
-                        }
-                    default:
-                        return false;
-                }
-                return true;
-            }
+            
             // When calling from build(), we can't add all expressions to the (begin) returned by (load), because that will
             // cause double-evaluation of field forms
             if (loadAllExps) {
@@ -786,5 +774,19 @@ class Kiss {
         return result;
     }
 
+    public static function isEmpty(expr:Expr) {
+        switch (expr.expr) {
+            case EBlock([]):
+            case EBlock(blockExps):
+                for (exp in blockExps) {
+                    if (!isEmpty(exp))
+                        return false;
+                }
+            default:
+                return false;
+        }
+        return true;
+    }
+
     #end
 }