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79 lines
2.2 KiB
Python
79 lines
2.2 KiB
Python
""" Efficient representation of tokens
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We want to have a token_list and start_position for everything the
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tokenizer returns. Therefore we need a memory efficient class. We
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found that a flat object with slots is the best. The Token object is
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that plus indexing and string backwards compatibility.
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"""
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class Token(object):
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__slots__ = [
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"token_type", "token", "start_pos_line", "start_pos_col"
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]
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@classmethod
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def from_tuple(cls, tp):
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return Token(tp[0], tp[1], tp[2][0], tp[2][1])
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def __init__(
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self, token_type, token, start_pos_line, start_pos_col
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):
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self.token_type = token_type
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self.token = token
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self.start_pos_line = start_pos_line
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self.start_pos_col = start_pos_col
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def __repr__(self):
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return "<%s: %s>" % (type(self).__name__, tuple(self))
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# Backward compatibility
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def __str__(self):
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return str(self.token)
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# Backward compatibility
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def __getitem__(self, key):
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# Builds the same structure as tuple used to have
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if key == 0:
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return self.token_type
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elif key == 1:
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return self.token
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elif key == 2:
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return (self.start_pos_line, self.start_pos_col)
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else:
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raise IndexError()
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# Backward compatibility
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def __setitem__(self, key, value):
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# setitem analogous to
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if key == 0:
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self.token_type = value
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elif key == 1:
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self.token = value
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elif key == 2:
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self.start_pos_line = value[0]
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self.start_pos_col = value[1]
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else:
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raise IndexError()
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# Backward compatibility
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def __getattr__(self, attr):
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# Expose the missing start_pos attribute
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if attr == "start_pos":
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return (self.start_pos_line, self.start_pos_col)
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else:
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raise AttributeError(
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"type '%s' has no attriubte '%s'" % (
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type(self),
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attr
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)
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)
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# Make cache footprint smaller
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def __getstate__(self):
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return tuple(self)
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def __setstate__(self, state):
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for i in range(len(state)):
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self[i] = state[i]
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