From cf72deef8b39c845c04210899f9caf8ce972e0c6 Mon Sep 17 00:00:00 2001
From: alpha <alpha@kejadlen.dev>
Date: Tue, 26 Jul 2022 20:28:18 +0000
Subject: [PATCH] make a Visitable module

FossilOrigin-Name: 3ffc71c707c994c44a9f33025ed50ab91d2a7e60be6c639b6ed28798d82728a2
---
 ruby/lib/lox/expr.rb | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/ruby/lib/lox/expr.rb b/ruby/lib/lox/expr.rb
index 38860a2..99bfbd1 100644
--- a/ruby/lib/lox/expr.rb
+++ b/ruby/lib/lox/expr.rb
@@ -1,19 +1,26 @@
 module Lox
   module Expr
+    module Visitable
+      def accept(visitor)
+        klass = self.class.to_s.split("::").last.downcase
+        visitor.send("visit_#{klass}", self)
+      end
+    end
+
     Binary = Struct.new(:left, :op, :right) do
-      def accept(visitor) = visitor.visit_binary(self)
+      include Visitable
     end
 
     Grouping = Struct.new(:expr) do
-      def accept(visitor) = visitor.visit_grouping(self)
+      include Visitable
     end
 
     Literal = Struct.new(:value) do
-      def accept(visitor) = visitor.visit_literal(self)
+      include Visitable
     end
 
     Unary = Struct.new(:op, :right) do
-      def accept(visitor) = visitor.visit_unary(self)
+      include Visitable
     end
   end
 end