add yaml serialization library

src/logic/scripting/lua/libs/api_lua.hpp

@@ -14,6 +14,7 @@
 ///    int l_function_name(lua::State* L);
 
 // Libraries
+extern const luaL_Reg applib[];
 extern const luaL_Reg audiolib[];
 extern const luaL_Reg base64lib[];
 extern const luaL_Reg bjsonlib[];
@@ -38,7 +39,6 @@ extern const luaL_Reg packlib[];
 extern const luaL_Reg particleslib[]; // gfx.particles
 extern const luaL_Reg playerlib[];
 extern const luaL_Reg quatlib[];
-extern const luaL_Reg applib[];
 extern const luaL_Reg text3dlib[]; // gfx.text3d
 extern const luaL_Reg timelib[];
 extern const luaL_Reg tomllib[];
@@ -48,6 +48,7 @@ extern const luaL_Reg vec3lib[];  // vecn.cpp
 extern const luaL_Reg vec4lib[];  // vecn.cpp
 extern const luaL_Reg weatherlib[];
 extern const luaL_Reg worldlib[];
+extern const luaL_Reg yamllib[];
 
 // Components
 extern const luaL_Reg skeletonlib[];

src/logic/scripting/lua/libs/libjson.cpp

@@ -19,4 +19,5 @@ static int l_json_parse(lua::State* L) {
 const luaL_Reg jsonlib[] = {
     {"tostring", lua::wrap<l_json_stringify>},
     {"parse", lua::wrap<l_json_parse>},
-    {NULL, NULL}};
+    {NULL, NULL}
+};

src/logic/scripting/lua/libs/libyaml.cpp

@@ -0,0 +1,20 @@
+#include "coders/yaml.hpp"
+#include "api_lua.hpp"
+
+static int l_stringify(lua::State* L) {
+    auto value = lua::tovalue(L, 1);
+    auto string = yaml::stringify(value);
+    return lua::pushstring(L, string);
+}
+
+static int l_parse(lua::State* L) {
+    auto string = lua::require_string(L, 1);
+    auto element = yaml::parse("[string]", string);
+    return lua::pushvalue(L, element);
+}
+
+const luaL_Reg yamllib[] = {
+    {"tostring", lua::wrap<l_stringify>},
+    {"parse", lua::wrap<l_parse>},
+    {NULL, NULL}
+};