from header import *
import importlib


def process_caption(caption):
    caption = re.sub(
        r"([\"()*#:;~])",
        " ",
        caption.lower(),
    )
    caption = re.sub(
        r"\s{2,}",
        " ",
        caption,
    )
    caption = caption.rstrip("\n")
    caption = caption.strip(" ")

    return caption


def instantiate_from_config(config):
    if not "target" in config:
        if config == '__is_first_stage__':
            return None
        elif config == "__is_unconditional__":
            return None
        raise KeyError("Expected key `target` to instantiate.")
    return get_obj_from_str(config["target"])(**config.get("params", dict()))


def get_obj_from_str(string, reload=False):
    module, cls = string.rsplit(".", 1)
    if reload:
        module_imp = importlib.import_module(module)
        importlib.reload(module_imp)
    return getattr(importlib.import_module(module, package=None), cls)