Merge pull request #854 from kzc/moz-regexp-2

Have mozilla AST RegExpLiteral parser use regex.pattern and regex.flags

lib/mozilla-ast.js

@@ -146,7 +146,14 @@
               case "boolean":
                 return new (val ? AST_True : AST_False)(args);
               default:
-                args.value = M.regex && M.raw ? M.raw : val;
+                var rx = M.regex;
+                if (rx && rx.pattern) {
+                    // RegExpLiteral as per ESTree AST spec
+                    args.value = new RegExp(rx.pattern, rx.flags).toString();
+                } else {
+                    // support legacy RegExp
+                    args.value = M.regex && M.raw ? M.raw : val;
+                }
                 return new AST_RegExp(args);
             }
         },
@@ -334,7 +341,7 @@
         };
     });
 
-    def_to_moz(AST_RegExp, function To_Moz_RegExp(M) {
+    def_to_moz(AST_RegExp, function To_Moz_RegExpLiteral(M) {
         var value = M.value;
         return {
             type: "Literal",