From 5ce69e991a00a5a0c5016bffd150ce0abbf84e1b Mon Sep 17 00:00:00 2001
From: Chris Fallin <cfallin@c1f.net>
Date: Fri, 12 Dec 2014 17:31:25 -0800
Subject: Support Ruby code generation only for proto3.

---
 src/google/protobuf/compiler/ruby/ruby_generator.cc | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'src/google/protobuf/compiler/ruby/ruby_generator.cc')

diff --git a/src/google/protobuf/compiler/ruby/ruby_generator.cc b/src/google/protobuf/compiler/ruby/ruby_generator.cc
index e70425ff..c5687903 100644
--- a/src/google/protobuf/compiler/ruby/ruby_generator.cc
+++ b/src/google/protobuf/compiler/ruby/ruby_generator.cc
@@ -297,6 +297,14 @@ bool Generator::Generate(
     const string& parameter,
     GeneratorContext* generator_context,
     string* error) const {
+
+  if (file->syntax() != FileDescriptor::SYNTAX_PROTO3) {
+    *error =
+        "Can only generate Ruby code for proto3 .proto files.\n"
+        "Please add 'syntax = \"proto3\";' to the top of your .proto file.\n";
+    return false;
+  }
+
   std::string filename =
       StripDotProto(file->name()) + ".rb";
   scoped_ptr<io::ZeroCopyOutputStream> output(generator_context->Open(filename));
-- 
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