Converting JSONValue to AssociativeArray.

Aug 01, 2022

hype_editor

Aug 01, 2022

Steven Schveighoffer

Aug 01, 2022

Ali Çehreli

Aug 02, 2022

hype_editor

import std.json : JSONValue; import std.stdio : writefln; void main() { JSONValue data = parseJSON(`{ "name": "Hype Editor", "hobby": "Programming" }`); writefln("%s", data); auto aa_data = /+ Converting +/; writefln("%s", aa_data); }

August 01, 2022

Re: Converting JSONValue to AssociativeArray.

Posted by Steven Schveighoffer
in reply to hype_editor

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Steven Schveighoffer

Posted in reply to hype_editor

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On 8/1/22 2:00 PM, hype_editor wrote:

I need to convert variable of type JSONValue to variable of type string[string] (AssociativeArray).

import std.json : JSONValue;
import std.stdio : writefln;

void main()
{
     JSONValue data = parseJSON(`{ "name": "Hype Editor", "hobby": "Programming" }`);
     writefln("%s", data);

     auto aa_data = /+ Converting +/;
     writefln("%s", aa_data);
}

And output will be:

["name":"Hype Editor","hobby":"Programming"]

How can I do this in D?

// option 1
    string[string] aa_data;
    foreach(string k, v; data) {
        aa_data[k] = v.get!string;
    }
// option 2
    import std.algorithm : map;
    import std.array : assocArray;
    import std.typecons : tuple;
    auto aa_data = data.object
        .byKeyValue
        .map!(kv => tuple(kv.key, kv.value.get!string))
        .assocArray;

I personally prefer the straightforward loop.

-Steve

On 8/1/22 15:47, Steven Schveighoffer wrote: You beat me to it. I used .object and .str: import std; void main() { JSONValue data = parseJSON(`{ "name": "Hype Editor", "hobby": "Programming" }`); writefln("%s", data); // This already sees the data as an AA but the type is JSONValue[string]": auto o = data.object; static assert(is(typeof(o) == JSONValue[string])); writeln("Accessing the data with .str:"); foreach (key, jsonValue; o) { writeln(" ", key, ": ", jsonValue.str); } // If that much is not sufficient, you can convert it to a // proper AA like this: auto aa_data = o .byKeyValue .map!(kv => tuple(kv.key, kv.value.str)) .assocArray; static assert(is(typeof(aa_data) == string[string])); writeln("Now it's string[string]:"); writefln(" %s", aa_data); } Ali

// option 1 string[string] aa_data; foreach(string k, v; data) { aa_data[k] = v.get!string; } // option 2 import std.algorithm : map; import std.array : assocArray; import std.typecons : tuple; auto aa_data = data.object .byKeyValue .map!(kv => tuple(kv.key, kv.value.get!string)) .assocArray;

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