65 lines
2.0 KiB
Python
65 lines
2.0 KiB
Python
#from collections import namedtuple
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from io import BytesIO
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from .abstract import AbstractType
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from .types import Schema
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class Struct(AbstractType):
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SCHEMA = Schema()
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def __init__(self, *args, **kwargs):
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if len(args) == len(self.SCHEMA.fields):
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for i, name in enumerate(self.SCHEMA.names):
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self.__dict__[name] = args[i]
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elif len(args) > 0:
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raise ValueError('Args must be empty or mirror schema')
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else:
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self.__dict__.update(kwargs)
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# overloading encode() to support both class and instance
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self.encode = self._encode_self
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@classmethod
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def encode(cls, item): # pylint: disable=E0202
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bits = []
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for i, field in enumerate(cls.SCHEMA.fields):
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bits.append(field.encode(item[i]))
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return b''.join(bits)
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def _encode_self(self):
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return self.SCHEMA.encode(
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[self.__dict__[name] for name in self.SCHEMA.names]
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)
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@classmethod
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def decode(cls, data):
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if isinstance(data, bytes):
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data = BytesIO(data)
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return cls(*[field.decode(data) for field in cls.SCHEMA.fields])
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def __repr__(self):
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key_vals = []
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for name, field in zip(self.SCHEMA.names, self.SCHEMA.fields):
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key_vals.append('%s=%s' % (name, field.repr(self.__dict__[name])))
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return self.__class__.__name__ + '(' + ', '.join(key_vals) + ')'
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def __hash__(self):
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return hash(self.encode())
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def __eq__(self, other):
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if self.SCHEMA != other.SCHEMA:
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return False
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for attr in self.SCHEMA.names:
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if self.__dict__[attr] != other.__dict__[attr]:
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return False
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return True
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"""
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class MetaStruct(type):
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def __new__(cls, clsname, bases, dct):
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nt = namedtuple(clsname, [name for (name, _) in dct['SCHEMA']])
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bases = tuple([Struct, nt] + list(bases))
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return super(MetaStruct, cls).__new__(cls, clsname, bases, dct)
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"""
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