def javascript_datatypes_filter()

in glean_parser/javascript.py [0:0]

• 37 lines of code
• 12 McCabe index (conditional complexity)

def javascript_datatypes_filter(value: util.JSONType) -> str:
    """
    A Jinja2 filter that renders Javascript literals.

    Based on Python's JSONEncoder, but overrides:
      - lists to use listOf
      - sets to use setOf
      - Rate objects to a CommonMetricData initializer
        (for external Denominators' Numerators lists)
    """

    class JavascriptEncoder(json.JSONEncoder):
        def iterencode(self, value):
            if isinstance(value, enum.Enum):
                yield from super().iterencode(util.camelize(value.name))
            elif isinstance(value, list):
                yield "["
                first = True
                for subvalue in value:
                    if not first:
                        yield ", "
                    yield from self.iterencode(subvalue)
                    first = False
                yield "]"
            elif isinstance(value, set):
                yield "["
                first = True
                for subvalue in sorted(list(value)):
                    if not first:
                        yield ", "
                    yield from self.iterencode(subvalue)
                    first = False
                yield "]"
            elif isinstance(value, metrics.Rate):
                yield "CommonMetricData("
                first = True
                for arg_name in util.common_metric_args:
                    if hasattr(value, arg_name):
                        if not first:
                            yield ", "
                        yield f"{util.camelize(arg_name)} = "
                        yield from self.iterencode(getattr(value, arg_name))
                        first = False
                yield ")"
            else:
                yield from super().iterencode(value)

    return "".join(JavascriptEncoder().iterencode(value))