Behave to cucumber JSON formatter

# -*- coding: utf-8 -*-

from __future__ import absolute_import
from behave.model_core import Status
from behave.formatter.base import Formatter
import base64
import six
import copy
try:
    import json
except ImportError:
    import simplejson as json


# -----------------------------------------------------------------------------
# CLASS: JSONFormatter
# -----------------------------------------------------------------------------
class CucumberJSONFormatter(Formatter):
    name = 'json'
    description = 'JSON dump of test run'
    dumps_kwargs = {
   }

    json_number_types = six.integer_types + (float,)
    json_scalar_types = json_number_types + (six.text_type, bool, type(None))

    def __init__(self, stream_opener, config):
        super(CucumberJSONFormatter, self).__init__(stream_opener, config)
        # -- ENSURE: Output stream is open.
        self.stream = self.open()
        self.feature_count = 0
        self.current_feature = None
        self.current_feature_data = None
        self._step_index = 0
        self.current_background = None
        self.current_background_data = None

    def reset(self):
        self.current_feature = None
        self.current_feature_data = None
        self._step_index = 0
        self.current_background = None

    # -- FORMATTER API:
    def uri(self, uri):
        pass

    def feature(self, feature):
        self.reset()
        self.current_feature = feature
        self.current_feature_data = {
   
            'id': self.generate_id(feature),
            'uri': feature.location.filename,
            'line': feature.location.line,
            'description': '',
            'keyword': feature.keyword,
            'name': feature.name,
            'tags': self.write_tags(feature.tags),
            'status': feature.status.name,
        }
        element = self.current_feature_data
        if feature.description:
            element['description'