From 181c834a932ac98bc4451c6f0110cf9816b9808b Mon Sep 17 00:00:00 2001
From: Yuriy Glukhov <yutiy.glukhov@gmail.com>
Date: Tue, 5 Apr 2016 22:55:00 +0300
Subject: [PATCH] Added json.getOrDefault along with {singleKey} tr
 optimization.

---
 lib/pure/json.nim | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/lib/pure/json.nim b/lib/pure/json.nim
index 5be0986640..b9da8a0dd0 100644
--- a/lib/pure/json.nim
+++ b/lib/pure/json.nim
@@ -858,6 +858,14 @@ proc `{}`*(node: JsonNode, keys: varargs[string]): JsonNode =
       return nil
     result = result.fields.getOrDefault(key)
 
+proc getOrDefault*(node: JsonNode, key: string): JsonNode =
+  ## Gets a field from a `node`. If `node` is nil or not an object or
+  ## value at `key` does not exist, returns nil
+  if not isNil(node) and node.kind == JObject:
+    result = node.fields.getOrDefault(key)
+
+template simpleGetOrDefault*{`{}`(node, [key])}(node: JsonNode, key: string): JsonNode = node.getOrDefault(key)
+
 proc `{}=`*(node: JsonNode, keys: varargs[string], value: JsonNode) =
   ## Traverses the node and tries to set the value at the given location
   ## to ``value``. If any of the keys are missing, they are added.