Better json management

source/util.d

@@ -3,18 +3,24 @@ module util;
 import std.format;
 import std.json;
 
-JSONValue requiredKey(string key)(JSONValue val) {
-  const(JSONValue)* j = key in val;
+void optional(T)(ref JSONValue val, string key, ref T receiver) {
+  const(JSONValue)* p = key in val;
 
-  if (j)
-    return *j;
+  if (p == null)
+    return;
 
-  throw new Exception(format("Key %s not found in json", key));
+  static if (is(JSONValue == T))
+    receiver = *p;
+  else
+    receiver = (*p).get!T;
 }
 
-T checkKey(T)(JSONValue val, string key) {
-  if (JSONValue* j = key in val)
-    return (*j).get!T;
-
-  return T.init;
+T optional(T)(ref JSONValue val, string key) {
+  T t;
+  optional(val, key, t);
+  return t;
+}
+
+void required(T)(ref JSONValue val, string key, ref T receiver) {
+  receiver = val[key].get!T;
 }