JSON API, fetch() API

flumi/Scripts/Utils/Lua/JSON.gd

@@ -0,0 +1,37 @@
+class_name LuaJSONUtils
+extends RefCounted
+
+static func setup_json_api(vm: LuauVM):
+	vm.lua_newtable()
+	
+	vm.lua_pushcallable(_lua_json_parse_handler, "JSON.parse")
+	vm.lua_setfield(-2, "parse")
+	
+	vm.lua_pushcallable(_lua_json_stringify_handler, "JSON.stringify")
+	vm.lua_setfield(-2, "stringify")
+	
+	vm.lua_setglobal("JSON")
+
+static func _lua_json_parse_handler(vm: LuauVM) -> int:
+	var json_string: String = vm.luaL_checkstring(1)
+	
+	var json = JSON.new()
+	var parse_result = json.parse(json_string)
+	
+	if parse_result == OK:
+		vm.lua_pushvariant(json.data)
+		return 1
+	else:
+		# Return nil and error message
+		vm.lua_pushnil()
+		vm.lua_pushstring("JSON parse error: " + json.get_error_message())
+		return 2
+
+static func _lua_json_stringify_handler(vm: LuauVM) -> int:
+	var value = vm.lua_tovariant(1)
+	
+	var json = JSON.new()
+	var json_string = json.stringify(value)
+	
+	vm.lua_pushstring(json_string)
+	return 1