From 5822596ab8f9f9b659a108e0a7f69d403cc86e41 Mon Sep 17 00:00:00 2001
From: David Majda <david@majda.cz>
Date: Tue, 13 Sep 2016 09:09:40 +0200
Subject: [PATCH] Replace classes.subclass with native classes

See #442.
---
 lib/grammar-error.js | 18 ++++++++----------
 lib/utils/classes.js | 12 ------------
 package.json         |  1 -
 3 files changed, 8 insertions(+), 23 deletions(-)
 delete mode 100644 lib/utils/classes.js

diff --git a/lib/grammar-error.js b/lib/grammar-error.js
index 99c8215..d4905e5 100644
--- a/lib/grammar-error.js
+++ b/lib/grammar-error.js
@@ -1,18 +1,16 @@
 "use strict";
 
-let classes = require("./utils/classes");
-
 /* Thrown when the grammar contains an error. */
-function GrammarError(message, location) {
-  this.name = "GrammarError";
-  this.message = message;
-  this.location = location;
+class GrammarError {
+  constructor(message, location) {
+    this.name = "GrammarError";
+    this.message = message;
+    this.location = location;
 
-  if (typeof Error.captureStackTrace === "function") {
-    Error.captureStackTrace(this, GrammarError);
+    if (typeof Error.captureStackTrace === "function") {
+      Error.captureStackTrace(this, GrammarError);
+    }
   }
 }
 
-classes.subclass(GrammarError, Error);
-
 module.exports = GrammarError;
diff --git a/lib/utils/classes.js b/lib/utils/classes.js
deleted file mode 100644
index 49c1c45..0000000
--- a/lib/utils/classes.js
+++ /dev/null
@@ -1,12 +0,0 @@
-"use strict";
-
-/* Class utilities */
-let classes = {
-  subclass: function(child, parent) {
-    function ctor() { this.constructor = child; }
-    ctor.prototype = parent.prototype;
-    child.prototype = new ctor();
-  }
-};
-
-module.exports = classes;
diff --git a/package.json b/package.json
index 7b42b1a..8372e69 100644
--- a/package.json
+++ b/package.json
@@ -37,7 +37,6 @@
     "lib/parser.js",
     "lib/peg.js",
     "lib/utils/arrays.js",
-    "lib/utils/classes.js",
     "lib/utils/objects.js",
     "package.json"
   ],