Reserved: Update list of reserved words to ECMAScript 2015

Author: Mingun

lib/peg.js

@@ -6,6 +6,7 @@ const parser = require("./parser");
 const VERSION = require("./version");
 
 const RESERVED_WORDS = [
+  // Reserved keywords as of ECMAScript 2015
   "break",
   "case",
   "catch",
@@ -17,38 +18,61 @@ const RESERVED_WORDS = [
   "delete",
   "do",
   "else",
-  "enum",
   "export",
   "extends",
-  "false",
   "finally",
   "for",
   "function",
   "if",
   "import",
-  "instanceof",
   "in",
+  "instanceof",
   "new",
-  "null",
   "return",
   "super",
   "switch",
   "this",
   "throw",
-  "true",
   "try",
   "typeof",
   "var",
   "void",
   "while",
-  "with"
+  "with",
+  // "yield", // encountered twice on the web page
+
+  // Special constants
+  "null",
+  "true",
+  "false",
+
+  // These are always reserved:
+  "enum",
+
+  // The following are only reserved when they are found in strict mode code
+  // Peggy generates code in strictly mode, so it applicable to it
+  "implements",
+  "interface",
+  "let",
+  "package",
+  "private",
+  "protected",
+  "public",
+  "static",
+  "yield",
+
+  // The following are only reserved when they are found in module code:
+  "await"
 ];
 
 const peg = {
   // Peggy version (filled in by /tools/release).
   VERSION,
   /**
-   * Default list of reserved words.
+   * Default list of reserved words. Contains list of currently and future
+   * JavaScript (ECMAScript 2015) reserved words.
+   *
+   * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Lexical_grammar#reserved_keywords_as_of_ecmascript_2015
    */
   RESERVED_WORDS,
   GrammarError,