jinja.py 文件源码

def create_macro_capture_env(node):

    class ParserMacroCapture(jinja2.Undefined):
        """
        This class sets up the parser to capture macros.
        """
        def __init__(self, hint=None, obj=None, name=None,
                     exc=None):
            super(jinja2.Undefined, self).__init__()

            self.node = node
            self.name = name
            self.package_name = node.get('package_name')

        def __getattr__(self, name):

            # jinja uses these for safety, so we have to override them.
            # see https://github.com/pallets/jinja/blob/master/jinja2/sandbox.py#L332-L339 # noqa
            if name in ['unsafe_callable', 'alters_data']:
                return False

            self.package_name = self.name
            self.name = name

            return self

        def __call__(self, *args, **kwargs):
            return True

    return ParserMacroCapture