json-to-xml

#!/usr/bin/env python3

import json
import sys
import xmltodict

JSON_FROM_PYTHON_NAMES = {
    dict: "object",
    list: "array",
    int: "Number",
    float: "Number",
    bool: "Boolean",
    None: "null"
}


class InvalidXMLSerializableData(Exception):
    pass


class IncompleteIfTreeException(Exception):
    pass


def validate_data(data):
    if type(data) == dict and len(data.keys()) == 1:
        return

    # Prefacing \n makes multierror lines easier to read
    message = "\n    Only a json object with 1 key can be serialized to xml"
    if type(data) != dict:
        type_name = JSON_FROM_PYTHON_NAMES[type(data)]
        if type_name[0] in ["a", "e", "i", "o", "u"]:
            message += "\n    The inputted json value is not an object, it is an {}".format(
                type_name)
        else:
            message += "\n    The inputted json value is not an object, it is a {}".format(
                type_name)
    elif type(data) == dict and len(data.keys()) != 1:
        message += "\n    Input object does not have 1 key, it has {} keys".format(
            data.keys())
    else:
        raise Exception(
            "The code cannot handle this input, to receive support, please file a bug specifying the input")
    raise InvalidXMLSerializableData(message)


def main():
    if len(sys.argv) != 1:
        print("Usage: json-to-xml")

    data = json.load(sys.stdin)
    validate_data(data)
    print(xmltodict.unparse(data, pretty=True))


if __name__ == "__main__":
    main()