From 176f852bf16cab52beaf96cd97e2457daf3c719f Mon Sep 17 00:00:00 2001
From: Camilo Roca <camilo.roca@cobi.bike>
Date: Fri, 20 Mar 2020 13:51:01 +0100
Subject: [PATCH] refactored AltLabelStructDecl to use es6 class

---
 .../tool/templates/codegen/JavaScript/JavaScript.stg  | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/tool/resources/org/antlr/v4/tool/templates/codegen/JavaScript/JavaScript.stg b/tool/resources/org/antlr/v4/tool/templates/codegen/JavaScript/JavaScript.stg
index cb167dc7f..b101bd9d4 100644
--- a/tool/resources/org/antlr/v4/tool/templates/codegen/JavaScript/JavaScript.stg
+++ b/tool/resources/org/antlr/v4/tool/templates/codegen/JavaScript/JavaScript.stg
@@ -701,11 +701,12 @@ class <struct.name> extends <if(contextSuperClass)><contextSuperClass><else>antl
 >>
 
 AltLabelStructDecl(struct,attrs,getters,dispatchMethods) ::= <<
-function <struct.name>(parser, ctx) {
-	<currentRule.name; format="cap">Context.call(this, parser);
-    <attrs:{a | <a>;}; separator="\n">
-    <currentRule.name; format="cap">Context.prototype.copyFrom.call(this, ctx);
-    return this;
+class <struct.name> extends <currentRule.name; format="cap">Context {
+    constructor(parser, ctx) {
+        super(parser);
+        <attrs:{a | <a>;}; separator="\n">
+        <currentRule.name; format="cap">Context.prototype.copyFrom.call(this, ctx);
+    }
 }
 
 <struct.name>.prototype = Object.create(<currentRule.name; format="cap">Context.prototype);