def build_filters()

in src/dispatch/database/service.py [0:0]

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

def build_filters(filter_spec):
    """Recursively process `filter_spec`"""
    if _is_iterable_filter(filter_spec):
        return list(chain.from_iterable(build_filters(item) for item in filter_spec))

    if isinstance(filter_spec, dict):
        # Check if filter spec defines a boolean function.
        for boolean_function in BOOLEAN_FUNCTIONS:
            if boolean_function.key in filter_spec:
                # The filter spec is for a boolean-function
                # Get the function argument definitions and validate
                fn_args = filter_spec[boolean_function.key]

                if not _is_iterable_filter(fn_args):
                    raise BadFilterFormat(
                        "`{}` value must be an iterable across the function "
                        "arguments".format(boolean_function.key)
                    )
                if boolean_function.only_one_arg and len(fn_args) != 1:
                    raise BadFilterFormat(
                        "`{}` must have one argument".format(boolean_function.key)
                    )
                if not boolean_function.only_one_arg and len(fn_args) < 1:
                    raise BadFilterFormat(
                        "`{}` must have one or more arguments".format(boolean_function.key)
                    )
                return [BooleanFilter(boolean_function.sqlalchemy_fn, *build_filters(fn_args))]

    return [Filter(filter_spec)]