How to convert jCard into first-class JSON? - json

Question

I need a stable and secure convertion algorithm (any language), that can produce the final output as "first class" JSON objects. Example:
jCard format: [["version", {}, "text", "4.0"],["fn", {}, "text", "Forrest Gump"]]
First-class JSON format: {"version":"4.0","fn":"Forrest Gump"}.

Answer 1

In python
first, I create one function named jcard_to_json that takes a jCard as input and converts it to a "first-class" JSON object. The function iterates over the items in the jCard, and for each item, it adds a key-value pair to the json_obj dictionary, where the key is the first item in the jCard thing and the value is the fourth item
Example:-
def jcard_to_json(jcard):
json_obj = {}
for item in jcard:
json_obj[item[0]] = item[3]
return json_obj
jcard = [["version", {}, "text", "4.0"], ["fn", {}, "text", "Forrest
Gump"]]
json_obj = jcard_to_json(jcard)

Answer 2

In Java.
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
public class JCardTest {
public static void main(String[] args) throws JSONException {
String jcardStr = "[\"vcard\","
+ " ["
+ " [\"version\", {}, \"float\", \"4.0\"],"
+ " [\"fn\", {}, \"text\", \"John Doe\"],"
+ " [\"gender\", {}, \"text\", \"M\"],"
+ " [\"categories\", {}, \"text\", \"computers\", \"cameras\"],"
+ " [\"number\", {}, \"integer\", 12345],"
+ " [\"adr\","
+ " { \"type\": \"work\" },"
+ " \"text\","
+ " ["
+ " \"\","
+ " \"Suite D2-630\","
+ " \"2875 Laurier\","
+ " \"Quebec\","
+ " \"QC\","
+ " \"G1V 2M2\","
+ " \"Canada\""
+ " ]"
+ " ]"
+ " ]"
+ " ]";
JSONArray jcard = new JSONArray(jcardStr);
jcard = jcard.getJSONArray(1);
JSONObject result = new JSONObject();
for (int i = 0; i < jcard.length(); i++) {
JSONArray arr = jcard.getJSONArray(i);
String name = arr.getString(0);
String dataType = arr.getString(2);
if (arr.length() == 4) {
switch (dataType) {
case "integer": {
long val = arr.getLong(3);
result.put(name, val);
}
break;
case "float": {
double val = arr.getDouble(3);
result.put(name, val);
}
break;
default:
Object val = arr.get(3);
if (val instanceof JSONArray) {
result.put(name, (JSONArray) val);
} else {
result.put(name, val.toString());
}
break;
}
} else {
JSONArray resArr = new JSONArray();
for (int j = 3; j < arr.length(); j++) {
resArr.put(arr.get(j).toString());
}
result.put(name, resArr);
}
}
System.out.println(result);
}
}
This ignores the 'parameter" part (arr.get(1)) of the jCard entries.
the code is verbose to not to hide important details. it could be written more compact.
Example is based on examples in the jCard RFC7095.