deferred_operand.py

   1 #!/usr/bin/env python3
   2
   3 from abc import ABC, abstractmethod
   4 from typing import Any, Generic, TypeVar
   5
   6 T = TypeVar('T')
   7
   8
   9 class DeferredOperand(ABC, Generic[T]):
  10     """A wrapper around an operand whose value is deferred until it is
  11     needed.  See subclass SmartFuture for an example usage.
  12     """
  13
  14     @abstractmethod
  15     def _resolve(self) -> T:
  16         pass
  17
  18     @staticmethod
  19     def resolve(x: Any) -> Any:
  20         while isinstance(x, DeferredOperand):
  21             x = x._resolve()
  22         return x
  23
  24     def __lt__(self, other: Any) -> bool:
  25         return DeferredOperand.resolve(self) < DeferredOperand.resolve(other)
  26
  27     def __le__(self, other: Any) -> bool:
  28         return DeferredOperand.resolve(self) <= DeferredOperand.resolve(other)
  29
  30     def __eq__(self, other: Any) -> bool:
  31         return DeferredOperand.resolve(self) == DeferredOperand.resolve(other)
  32
  33     def __ne__(self, other: Any) -> bool:
  34         return DeferredOperand.resolve(self) != DeferredOperand.resolve(other)
  35
  36     def __gt__(self, other: Any) -> bool:
  37         return DeferredOperand.resolve(self) > DeferredOperand.resolve(other)
  38
  39     def __ge__(self, other: Any) -> bool:
  40         return DeferredOperand.resolve(self) >= DeferredOperand.resolve(other)
  41
  42     def __not__(self) -> bool:
  43         return not DeferredOperand.resolve(self)
  44
  45     def bool(self) -> bool:
  46         return DeferredOperand.resolve(self)
  47
  48     def __add__(self, other: Any) -> T:
  49         return DeferredOperand.resolve(self) + DeferredOperand.resolve(other)
  50
  51     def __iadd__(self, other: Any) -> T:
  52         return DeferredOperand.resolve(self) + DeferredOperand.resolve(other)
  53
  54     def __radd__(self, other: Any) -> T:
  55         return DeferredOperand.resolve(self) + DeferredOperand.resolve(other)
  56
  57     def __sub__(self, other: Any) -> T:
  58         return DeferredOperand.resolve(self) - DeferredOperand.resolve(other)
  59
  60     def __mul__(self, other: Any) -> T:
  61         return DeferredOperand.resolve(self) * DeferredOperand.resolve(other)
  62
  63     def __pow__(self, other: Any) -> T:
  64         return DeferredOperand.resolve(self) ** DeferredOperand.resolve(other)
  65
  66     def __truediv__(self, other: Any) -> Any:
  67         return DeferredOperand.resolve(self) / DeferredOperand.resolve(other)
  68
  69     def __floordiv__(self, other: Any) -> T:
  70         return DeferredOperand.resolve(self) // DeferredOperand.resolve(other)
  71
  72     def __contains__(self, other):
  73         return DeferredOperand.resolve(other) in DeferredOperand.resolve(self)
  74
  75     def and_(self, other):
  76         return DeferredOperand.resolve(self) & DeferredOperand.resolve(other)
  77
  78     def or_(self, other):
  79         return DeferredOperand.resolve(self) & DeferredOperand.resolve(other)
  80
  81     def xor(self, other):
  82         return DeferredOperand.resolve(self) & DeferredOperand.resolve(other)
  83
  84     def invert(self):
  85         return ~(DeferredOperand.resolve(self))
  86
  87     def is_(self, other):
  88         return DeferredOperand.resolve(self) is DeferredOperand.resolve(other)
  89
  90     def is_not(self, other):
  91         return DeferredOperand.resolve(self) is not DeferredOperand.resolve(other)
  92
  93     def __abs__(self):
  94         return abs(DeferredOperand.resolve(self))
  95
  96     def setitem(self, k, v):
  97         DeferredOperand.resolve(self)[DeferredOperand.resolve(k)] = v
  98
  99     def delitem(self, k):
 100         del DeferredOperand.resolve(self)[DeferredOperand.resolve(k)]
 101
 102     def getitem(self, k):
 103         return DeferredOperand.resolve(self)[DeferredOperand.resolve(k)]
 104
 105     def lshift(self, other):
 106         return DeferredOperand.resolve(self) << DeferredOperand.resolve(other)
 107
 108     def rshift(self, other):
 109         return DeferredOperand.resolve(self) >> DeferredOperand.resolve(other)
 110
 111     def mod(self, other):
 112         return DeferredOperand.resolve(self) % DeferredOperand.resolve(other)
 113
 114     def matmul(self, other):
 115         return DeferredOperand.resolve(self) @ DeferredOperand.resolve(other)
 116
 117     def neg(self):
 118         return -(DeferredOperand.resolve(self))
 119
 120     def pos(self):
 121         return +(DeferredOperand.resolve(self))
 122
 123     def truth(self):
 124         return DeferredOperand.resolve(self)
 125
 126     def __hash__(self):
 127         return DeferredOperand.resolve(self).__hash__()
 128
 129     def __call__(self):
 130         return DeferredOperand.resolve(self)()
 131
 132     def __iter__(self):
 133         return DeferredOperand.resolve(self).__iter__()
 134
 135     def __repr__(self) -> str:
 136         return DeferredOperand.resolve(self).__repr__()
 137
 138     def __bytes__(self) -> bytes:
 139         return DeferredOperand.resolve(self).__bytes__()
 140
 141     def __int__(self) -> int:
 142         return int(DeferredOperand.resolve(self))
 143
 144     def __float__(self) -> float:
 145         return float(DeferredOperand.resolve(self))
 146
 147     def __getattr__(self, method_name):
 148         def method(*args, **kwargs):
 149             return getattr(DeferredOperand.resolve(self), method_name)(
 150                 *args, **kwargs
 151             )
 152         return method