ensuring local tags are retained after loading a node + test

src/emitfromevents.cpp

@@ -116,8 +116,13 @@ void EmitFromEvents::BeginNode() {
 }
 
 void EmitFromEvents::EmitProps(const std::string& tag, anchor_t anchor) {
-  if (!tag.empty() && tag != "?" && tag != "!")
+  if (!tag.empty() && tag != "?" && tag != "!"){
+      if (tag[0] == '!') {
+        m_emitter << LocalTag(std::string(tag.begin()+1, tag.end()));
+      } else {
         m_emitter << VerbatimTag(tag);
+      }
+  }
   if (anchor)
     m_emitter << Anchor(ToString(anchor));
 }

test/integration/emitter_test.cpp

@@ -629,6 +629,17 @@ TEST_F(EmitterTest, LocalTagWithScalar) {
   ExpectEmit("!foo bar");
 }
 
+TEST_F(EmitterTest, LocalTagRetainedAfterLoadingNode) {
+  Node n = Node("hello");
+  out << LocalTag("foo") << n;
+  std::string expected = "!foo hello";
+  ExpectEmit(expected);
+  Node yamlNode = Load(out.c_str());
+  Emitter emitter;
+  emitter << yamlNode;
+  EXPECT_EQ(expected, emitter.c_str());
+}
+
 TEST_F(EmitterTest, ComplexDoc) {
   out << BeginMap;
   out << Key << "receipt";