diff options
| -rw-r--r-- | lib/pure/json.nim | 43 |
1 files changed, 27 insertions, 16 deletions
diff --git a/lib/pure/json.nim b/lib/pure/json.nim index 1617402c9..f0c554551 100644 --- a/lib/pure/json.nim +++ b/lib/pure/json.nim @@ -808,22 +808,25 @@ proc `[]=`*(obj: JsonNode, key: string, val: JsonNode) = return obj.fields.add((key, val)) -proc `{}`*(node: JsonNode, key: string): JsonNode = - ## Transverses the node and gets the given value. If any of the - ## names does not exist, returns nil +proc `{}`*(node: JsonNode, keys: varargs[string]): JsonNode = + ## Traverses the node and gets the given value. If any of the + ## keys do not exist, returns nil. Also returns nil if one of the + ## intermediate data structures is not an object result = node - if isNil(node): return nil - result = result[key] - -proc `{}=`*(node: JsonNode, names: varargs[string], value: JsonNode) = - ## Transverses the node and tries to set the value at the given location - ## to `value` If any of the names are missing, they are added + for key in keys: + if isNil(result) or result.kind!=JObject: + return nil + result=result[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 var node = node - for i in 0..(names.len-2): - if isNil(node[names[i]]): - node[names[i]] = newJObject() - node = node[names[i]] - node[names[names.len-1]] = value + for i in 0..(keys.len-2): + if isNil(node[keys[i]]): + node[keys[i]] = newJObject() + node = node[keys[i]] + node[keys[keys.len-1]] = value proc delete*(obj: JsonNode, key: string) = ## Deletes ``obj[key]`` preserving the order of the other (key, value)-pairs. @@ -1186,9 +1189,17 @@ when isMainModule: except: assert(false, "EInvalidIndex thrown for valid index") + assert(testJson{"b"}.str=="asd", "Couldn't fetch a singly nested key with {}") + assert(isNil(testJson{"nonexistent"}), "Non-existent keys should return nil") + assert(parsed2{"repository", "description"}.str=="IRC Library for Haskell", "Couldn't fetch via multiply nested key using {}") + assert(isNil(testJson{"a", "b"}), "Indexing through a list should return nil") + assert(isNil(testJson{"a", "b"}), "Indexing through a list should return nil") + assert(testJson{"a"}==parseJson"[1, 2, 3, 4]", "Didn't return a non-JObject when there was one to be found") + assert(isNil(parseJson("[1, 2, 3]"){"foo"}), "Indexing directly into a list should return nil") + # Generator: var j = %* [{"name": "John", "age": 30}, {"name": "Susan", "age": 31}] - assert j == %[%{"name": %"John", "age": %30}, %{"name": %"Susan", "age": %31}] + assert j == %[%{"name": %"John", "age": %30}, %{"name": %"Susan", "age": %31}] var j2 = %* [ @@ -1216,7 +1227,7 @@ when isMainModule: } ] assert j3 == %[%{"name": %"John", "age": %30}, %{"name": %"Susan", "age": %31}] - + discard """ while true: var json = stdin.readLine() |