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Merge pull request #4051 from yglukhov/json-getOrDefault

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Added json.getOrDefault along with {singleKey} tr optimization.
This commit is contained in:
Andreas Rumpf 2016-04-09 13:07:36 +02:00
commit d6cf109952
1 changed files with 8 additions and 0 deletions
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8
lib/pure/json.nim
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@ -858,6 +858,14 @@ proc `{}`*(node: JsonNode, keys: varargs[string]): JsonNode =
return nil return nil
result = result.fields.getOrDefault(key) 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) = proc `{}=`*(node: JsonNode, keys: varargs[string], value: JsonNode) =
## Traverses the node and tries to set the value at the given location ## 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. ## to ``value``. If any of the keys are missing, they are added.