[Gretl-devel] Re: Datatypes of json items
On Sat, 15 Jun 2019, Artur Tarassow wrote:
Dear all,
I hope you had a successful gretl conference in Naples!
I am currently working with json files again. Using latest git version of
gretl on Ubuntu linux (even though the behavior also occurs for older
versions), I've found that some of the json-elements grabbed are not of the
expected datatype. See the the following example and the file attached:
<hansl>
string PATH2JSON = "/home/at/tmp/" # set your path
string jsonfile = sprintf("%s/ex_json_num_vector.json", PATH2JSON)
string jread = readfile("@jsonfile")
bundle B = jsongetb(jread)
b = B.JSON
# Evaluate type of elements
#-----------------------------------------------------
# Item Expected Is
# v1 string null
# v2 string array string array
# v3 scalar scalar
# v4 matrix string array
loop i=1..nelem(b) -q
string str = "v$i"
eval b["@str"]
eval typestr(typeof(b["@str"]))
print ""
endloop
</hansl>
Is there a rational reason for this behavior?
Not really. It seems that typeof() is not reaching inside bundles to
find the type of their contents. That should be made to happen.
BTW (though not relevant to your question),
b["@str"]
is a kinda ugly construction, the recommended variant would be
b[str]
Allin