Added long key flow map

src/emitter.cpp

@@ -422,10 +422,59 @@ namespace YAML
 
     void Emitter::FlowMapPrepareLongKey(EmitterNodeType::value child)
     {
+        const unsigned lastIndent = m_pState->LastIndent();
+        
+        if(!m_pState->HasBegunNode()) {
+            if(m_stream.comment())
+                m_stream << "\n";
+            m_stream << IndentTo(lastIndent);
+            if(m_pState->CurGroupChildCount() == 0)
+                m_stream << "{ ?";
+            else
+                m_stream << ", ?";
+        }
+        
+        switch(child) {
+            case EmitterNodeType::None:
+                break;
+            case EmitterNodeType::Property:
+            case EmitterNodeType::Scalar:
+            case EmitterNodeType::FlowSeq:
+            case EmitterNodeType::FlowMap:
+                SpaceOrIndentTo(m_pState->HasBegunContent() || m_pState->CurGroupChildCount() > 0, lastIndent);
+                break;
+            case EmitterNodeType::BlockSeq:
+            case EmitterNodeType::BlockMap:
+                assert(false);
+                break;
+        }
     }
     
     void Emitter::FlowMapPrepareLongKeyValue(EmitterNodeType::value child)
     {
+        const unsigned lastIndent = m_pState->LastIndent();
+        
+        if(!m_pState->HasBegunNode()) {
+            if(m_stream.comment())
+                m_stream << "\n";
+            m_stream << IndentTo(lastIndent);
+            m_stream << ":";
+        }
+        
+        switch(child) {
+            case EmitterNodeType::None:
+                break;
+            case EmitterNodeType::Property:
+            case EmitterNodeType::Scalar:
+            case EmitterNodeType::FlowSeq:
+            case EmitterNodeType::FlowMap:
+                SpaceOrIndentTo(m_pState->HasBegunContent() || m_pState->CurGroupChildCount() > 0, lastIndent);
+                break;
+            case EmitterNodeType::BlockSeq:
+            case EmitterNodeType::BlockMap:
+                assert(false);
+                break;
+        }
     }
     
     void Emitter::FlowMapPrepareSimpleKey(EmitterNodeType::value child)