def from_yaml()

in tools/yaml_parser.py [0:0]

• 14 lines of code
• 4 McCabe index (conditional complexity)

  def from_yaml(cls: Type[UrlTagConfigType],
                yaml_config: Mapping[str, Any]) -> UrlTagConfigType:
    """Builds an UrlTagConfig instance from a YAML config.

    Args:
      yaml_config: A config loaded from a YAML file.

    Returns:
      An UrlTagConfig instance loaded from the YAML config.

    Raises:
      ValueError:
        - if yaml_config does not contain a `format` field.
        - if yaml_config['format'] is not one of the supported formats.
    """
    if _FORMAT_KEY not in yaml_config:
      raise ValueError(f"YAML config should contain `{_FORMAT_KEY}` key "
                       f"but was {yaml_config}.")

    format_value = yaml_config[_FORMAT_KEY]
    domain_value = None

    if format_value not in _SUPPORTED_FORMAT_VALUES:
      raise ValueError(
          f"'format' must be one of {set(_SUPPORTED_FORMAT_VALUES)} but was "
          f"{format_value}.")

    if _REQUIRED_DOMAIN_KEY in yaml_config:
      domain_value = yaml_config[_REQUIRED_DOMAIN_KEY]
    return cls(format=format_value, required_domain=domain_value)