JSONPointer
Implementation of JSON Pointers according to RFC 6901
Overview
JSONPointer is a Unicode string containing a sequence of zero or more reference tokens, each prefixed by a '/' (%x2F) character.
Examples
Constructing Dictionary
using JSONPointer
julia>p1 = j"/a/1/b"
p2 = j"/a/2/b"
data = PointerDict(p1 =>1, p2 => 2)
PointerDict{String,Any} with 1 entry:
"a" => Any[OrderedDict{String,Any}("b"=>1), OrderedDict{String,Any}("b"=>2)]
Accessing nested data
using JSONPointer
julia> arr = [[10, 20, 30, ["me"]]]
arr[j"/1"] == [10, 20, 30, ["me"]]
arr[j"/1/2"] == 20
arr[j"/1/4"] == ["me"]
arr[j"/1/4/1"] == "me"
julia> dict = PointerDict("a" => Dict("b" => Dict("c" => [100, Dict("d" => 200)])))
dict[j"/a"]
dict[j"/a/b"]
dict[j"/a/b/c/1"]
dict[j"/a/b/c/2/d"]Advanced
Array-index
- Note that Julia is using 1-based index, 0-based index can be used if argument
shift_index = trueis given to aJSONPointer.Pointerconstructer
julia>JSONPointer.Pointer(j"/foo/0"; shift_index = true)Constructing Dictionary With Static type
You can enforce type with ::T at the end of pointer:
p1 = j"/a::array"
p2 = j"/b/2::string"
data = PointerDict(p1 => [1,2,3], p2 => "Must be a String")
data = PointerDict(p1 => "MethodError", p2 => "Must be a String")
data = PointerDict(p1 => [1,2,3], p2 => :MethodError)The type T must be one of the six types supported by JSON:
::string::number::object::array::boolean::null
String number as a key
If you need to use a string number as key for dict, put '' in front of a number
p1 = j"/\10"
data = PointerDict(p1 => "this won't be a array")
data[p1]