41 lines
1.8 KiB
Python
41 lines
1.8 KiB
Python
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class MessageParser():
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def __init__(self):
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self.handlers = {}
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def add_handler(self, code: str, args={}):
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self.handlers[code] = {
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"args": args
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}
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def parse(self, message: str):
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if len(message) < 1:
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return None, "Message is empty"
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message_code = message[0]
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if message_code not in self.handlers:
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return None, "Message code is not handled"
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message_arguments = message[1:].split(";")
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handler = self.handlers[message_code]
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decoded_arguments = {}
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if len(handler["args"]) != len(message_arguments):
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return None, "Got message with invalid argument count"
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for i, argument_name in enumerate(handler["args"]):
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argument_type = handler["args"][argument_name]
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if argument_type == "int":
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try:
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decoded_arguments[argument_name] = int(message_arguments[i])
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except ValueError:
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return None, "Error parsing int argument for message (is it really an int?)"
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elif argument_type == "float":
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try:
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decoded_arguments[argument_name] = float(message_arguments[i])
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except ValueError:
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return None, "Error parsing float argument for message (is it really a float?)"
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elif argument_type == "str":
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decoded_arguments[argument_name] = message_arguments[i]
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elif argument_type == "char":
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if len(message_arguments[i]) != 1:
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return None, "Error parsing char argument due to invalid size"
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decoded_arguments[argument_name] = message_arguments[i]
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else:
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raise ValueError("parse(): Message handler references an invalid argument type")
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return message_code, decoded_arguments
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