from barely_json import parse
from pyparsing import ParseException
from resolver import pattern


@pattern(name="JsonString")
class JsonString(str):
    """
    A specific derived string which is converted from JSON or dict.
    """

    def __new__(cls, plaintext: str):
        return str.__new__(cls, plaintext)

    def parsed(self):
        try:
            return parse(self)
        except ParseException as e:
            raise ValueError(f"Invalid json-string. Error message: {e}")