2 files changed, 19 insertions, 2 deletions
diff --git a/source/core/StarJsonExtra.cpp b/source/core/StarJsonExtra.cpp
index 7a660d1..aed4989 100644
--- a/source/core/StarJsonExtra.cpp
+++ b/source/core/StarJsonExtra.cpp
@@ -301,7 +301,7 @@ StringList jsonToStringList(Json const& v) {
 
 Json jsonFromStringList(List<String> const& v) {
   JsonArray result;
-  for (auto e : v)
+  for (auto& e : v)
     result.push_back(e);
   return result;
 }
@@ -322,7 +322,7 @@ StringSet jsonToStringSet(Json const& v) {
 
 Json jsonFromStringSet(StringSet const& v) {
   JsonArray result;
-  for (auto e : v)
+  for (auto& e : v)
     result.push_back(e);
   return result;
 }
@@ -369,6 +369,20 @@ List<Color> jsonToColorList(Json const& v) {
   return result;
 }
 
+List<Directives> jsonToDirectivesList(Json const& v) {
+  List<Directives> result;
+  for (auto const& entry : v.iterateArray())
+    result.append(move(entry.toString()));
+  return result;
+}
+
+Json jsonFromDirectivesList(List<Directives> const& v) {
+  JsonArray result;
+  for (auto& e : v)
+    result.push_back(e.toString());
+  return result;
+}
+
 Json weightedChoiceFromJson(Json const& source, Json const& default_) {
   if (source.isNull())
     return default_;
diff --git a/source/core/StarJsonExtra.hpp b/source/core/StarJsonExtra.hpp
index 3bf5b9c..cfe7efb 100644
--- a/source/core/StarJsonExtra.hpp
+++ b/source/core/StarJsonExtra.hpp
@@ -6,6 +6,7 @@
 #include "StarColor.hpp"
 #include "StarSet.hpp"
 #include "StarWeightedPool.hpp"
+#include "StarDirectives.hpp"
 
 namespace Star {
 
@@ -81,6 +82,8 @@ List<Vec2U> jsonToVec2UList(Json const& v);
 List<Vec2F> jsonToVec2FList(Json const& v);
 List<Vec4B> jsonToVec4BList(Json const& v);
 List<Color> jsonToColorList(Json const& v);
+List<Directives> jsonToDirectivesList(Json const& v);
+Json jsonFromDirectivesList(List<Directives> const& v);
 
 Json weightedChoiceFromJson(Json const& source, Json const& default_);