From 7e129c9b6495a987019738fe32997f8184a1e15e Mon Sep 17 00:00:00 2001
From: Jesse Beder <jbeder+github@gmail.com>
Date: Tue, 6 Sep 2011 00:24:10 -0500
Subject: [PATCH] Fixed empty string emitter bug (it now with auto-quote it

---
 src/emitterutils.cpp  | 3 +++
 test/emittertests.cpp | 9 +++++++++
 2 files changed, 12 insertions(+)

diff --git a/src/emitterutils.cpp b/src/emitterutils.cpp
index 5bc0ba9..be512af 100644
--- a/src/emitterutils.cpp
+++ b/src/emitterutils.cpp
@@ -128,6 +128,9 @@ namespace YAML
 			}
 			
 			bool IsValidPlainScalar(const std::string& str, bool inFlow, bool allowOnlyAscii) {
+				if(str.empty())
+					return false;
+				
 				// first check the start
 				const RegEx& start = (inFlow ? Exp::PlainScalarInFlow() : Exp::PlainScalar());
 				if(!start.Matches(str))
diff --git a/test/emittertests.cpp b/test/emittertests.cpp
index 329ed3b..a7c13d8 100644
--- a/test/emittertests.cpp
+++ b/test/emittertests.cpp
@@ -846,6 +846,14 @@ namespace Test
 			out << "Oops";
 			desiredOutput = "Hi\n---\nBye\n---\nOops";
 		}
+		
+		void EmptyString(YAML::Emitter& out, std::string& desiredOutput)
+		{
+			out << YAML::BeginMap;
+			out << YAML::Key << "key" << YAML::Value << "";
+			out << YAML::EndMap;
+			desiredOutput = "key: \"\"";
+		}
 
 		////////////////////////////////////////////////////////////////////////////////////////////////////////
 		// incorrect emitting
@@ -1058,6 +1066,7 @@ namespace Test
 		RunEmitterTest(&Emitter::BoolFormatting, "bool formatting", passed, total);
 		RunEmitterTest(&Emitter::DocStartAndEnd, "doc start and end", passed, total);
 		RunEmitterTest(&Emitter::ImplicitDocStart, "implicit doc start", passed, total);
+		RunEmitterTest(&Emitter::EmptyString, "empty string", passed, total);
 		
 		RunEmitterErrorTest(&Emitter::ExtraEndSeq, "extra EndSeq", passed, total);
 		RunEmitterErrorTest(&Emitter::ExtraEndMap, "extra EndMap", passed, total);