import re
import sys


#
# Return a file handle or STDIN
#
def open_file(filename):
    if filename and not filename == "-":
        return open(filename)
    else:
        return sys.stdin


#
# Read lines of defines into a dictionary
#
def parse_hw_defs(filename):
    hw_defs = {}

    with open_file(filename) as file:
        for line in file.readlines():
            m = re.match(r"#define ([^\s]*)\s*(.*)", line.rstrip())
            if m:
                name = m.group(1)
                value = m.group(2)
                if value.isnumeric():
                    value = int(value)
                elif not value:
                    value = None
                hw_defs[name] = value

    return hw_defs


def prune_dict(d):
    # ret = {}
    # for k, v in d.items():
    #     if v is not None:
    #         ret[k] = v
    # return ret
    return d


# class DictEncoder(json.JSONEncoder):
#     def default(self, o):
#         if isinstance(o, Switch):
#             return prune_dict(o.__dict__)
#         if isinstance(o, ADCInput):
#             return prune_dict(o.__dict__)
#         if isinstance(o, SPI_ADCInput):
#             return prune_dict(o.__dict__)
#         if isinstance(o, ADC):
#             return prune_dict(o.__dict__)
#         if isinstance(o, Trim):
#             return prune_dict(o.__dict__)
#         if isinstance(o, Key):
#             return prune_dict(o.__dict__)
#         if isinstance(o, Display):
#             return prune_dict(o.__dict__)
#         if isinstance(o, CFS):
#             return prune_dict(o.__dict__)
#         if isinstance(o, Misc):
#             return prune_dict(o.__dict__)

#         # Let the base class default method raise the TypeError
#         return json.JSONEncoder.default(self, o)


#
# Parse HAL defines into JSON
#
def parse_defines(filename, target):
    # hw_defs = LoggingDict(parse_hw_defs(filename))
    # out_defs = {}
    #
    # print(json.dumps(out_defs, cls=DictEncoder, indent=2))
    pass