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https://github.com/python/cpython.git
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SF patch #1043218
Simplify internal calls and logic for _fix() and _fixexponents(). (Contributed by Facundo Batista.)
This commit is contained in:
Raymond Hettinger
parent
7a8ce5afcc
commit
dab988dd23
@ -459,7 +459,7 @@ class Decimal(object):
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# (-1)**_sign * _int * 10**_exp
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# Special values are signified by _is_special == True
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# We're immutable, so use _new__ not __init__
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# We're immutable, so use __new__ not __init__
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def __new__(cls, value="0", context=None):
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"""Create a decimal point instance.
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@ -851,7 +851,7 @@ class Decimal(object):
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if context is None:
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context = getcontext()
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if context._rounding_decision == ALWAYS_ROUND:
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return Decimal((sign, self._int, self._exp))._fix(context=context)
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return Decimal((sign, self._int, self._exp))._fix(context)
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return Decimal( (sign, self._int, self._exp))
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def __pos__(self, context=None):
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@ -873,7 +873,7 @@ class Decimal(object):
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context = getcontext()
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if context._rounding_decision == ALWAYS_ROUND:
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ans = self._fix(context=context)
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ans = self._fix(context)
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else:
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ans = Decimal(self)
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ans._sign = sign
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@ -943,14 +943,14 @@ class Decimal(object):
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exp = other._exp - context.prec-1
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ans = other._rescale(exp, watchexp=0, context=context)
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if shouldround:
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ans = ans._fix(context=context)
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ans = ans._fix(context)
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return ans
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if not other:
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if exp < self._exp - context.prec-1:
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exp = self._exp - context.prec-1
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ans = self._rescale(exp, watchexp=0, context=context)
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if shouldround:
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ans = ans._fix(context=context)
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ans = ans._fix(context)
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return ans
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op1 = _WorkRep(self)
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@ -991,7 +991,7 @@ class Decimal(object):
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result.exp = op1.exp
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ans = Decimal(result)
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if shouldround:
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ans = ans._fix(context=context)
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ans = ans._fix(context)
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return ans
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__radd__ = __add__
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@ -1052,7 +1052,7 @@ class Decimal(object):
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if context is None:
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context = getcontext()
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if round and context._rounding_decision == ALWAYS_ROUND:
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ans = ans._fix(context=context)
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ans = ans._fix(context)
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return ans
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def __mul__(self, other, context=None):
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@ -1090,19 +1090,19 @@ class Decimal(object):
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ans = Decimal((resultsign, (0,), resultexp))
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if shouldround:
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#Fixing in case the exponent is out of bounds
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ans = ans._fix(context=context)
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ans = ans._fix(context)
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return ans
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# Special case for multiplying by power of 10
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if self._int == (1,):
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ans = Decimal((resultsign, other._int, resultexp))
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if shouldround:
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ans = ans._fix(context=context)
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ans = ans._fix(context)
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return ans
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if other._int == (1,):
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ans = Decimal((resultsign, self._int, resultexp))
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if shouldround:
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ans = ans._fix(context=context)
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ans = ans._fix(context)
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return ans
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op1 = _WorkRep(self)
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@ -1110,7 +1110,7 @@ class Decimal(object):
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ans = Decimal( (resultsign, map(int, str(op1.int * op2.int)), resultexp))
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if shouldround:
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ans = ans._fix(context=context)
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ans = ans._fix(context)
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return ans
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__rmul__ = __mul__
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@ -1209,7 +1209,7 @@ class Decimal(object):
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exp = min(self._exp, other._exp)
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ans2 = self._rescale(exp, context=context, watchexp=0)
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if shouldround:
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ans2 = ans2._fix(context=context)
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ans2 = ans2._fix(context)
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return (Decimal( (sign, (0,), 0) ),
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ans2)
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@ -1246,7 +1246,7 @@ class Decimal(object):
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watchexp=0)
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context._regard_flags(*frozen)
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if shouldround:
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otherside = otherside._fix(context=context)
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otherside = otherside._fix(context)
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return (Decimal(res), otherside)
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if op1.int == 0 and adjust >= 0 and not divmod:
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@ -1286,7 +1286,7 @@ class Decimal(object):
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ans = Decimal(res)
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if shouldround:
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ans = ans._fix(context=context)
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ans = ans._fix(context)
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return ans
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def __rdiv__(self, other, context=None):
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@ -1371,7 +1371,7 @@ class Decimal(object):
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r._sign, comparison._sign = s1, s2
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#Get flags now
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self.__divmod__(other, context=context)
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return r._fix(context=context)
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return r._fix(context)
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r._sign, comparison._sign = s1, s2
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rounding = context._set_rounding_decision(NEVER_ROUND)
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@ -1402,7 +1402,7 @@ class Decimal(object):
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else:
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r._sign, comparison._sign = s1, s2
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return r._fix(context=context)
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return r._fix(context)
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def __floordiv__(self, other, context=None):
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"""self // other"""
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@ -1441,44 +1441,31 @@ class Decimal(object):
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"""
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return long(self.__int__())
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def _fix(self, prec=None, rounding=None, folddown=None, context=None):
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def _fix(self, context):
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"""Round if it is necessary to keep self within prec precision.
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Rounds and fixes the exponent. Does not raise on a sNaN.
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Arguments:
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self - Decimal instance
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prec - precision to which to round. By default, the context decides.
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rounding - Rounding method. By default, the context decides.
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folddown - Fold down high elements, by default context._clamp
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context - context used.
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"""
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if self._is_special:
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return self
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if context is None:
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context = getcontext()
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if prec is None:
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prec = context.prec
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ans = Decimal(self)
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ans = ans._fixexponents(prec, rounding, folddown=folddown,
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context=context)
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prec = context.prec
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ans = self._fixexponents(prec, context)
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if len(ans._int) > prec:
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ans = ans._round(prec, rounding, context=context)
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ans = ans._fixexponents(prec, rounding, folddown=folddown,
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context=context)
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ans = ans._round(prec, context=context)
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ans = ans._fixexponents(prec, context)
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return ans
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def _fixexponents(self, prec=None, rounding=None, folddown=None,
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context=None):
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"""Fix the exponents and return a copy with the exponent in bounds."""
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if self._is_special:
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return self
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if context is None:
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context = getcontext()
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if prec is None:
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prec = context.prec
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if folddown is None:
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folddown = context._clamp
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def _fixexponents(self, prec, context):
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"""Fix the exponents and return a copy with the exponent in bounds.
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Only call if known to not be a special value.
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"""
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folddown = context._clamp
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Emin = context.Emin
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ans = Decimal(self)
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ans_adjusted = ans.adjusted()
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@ -1756,7 +1743,7 @@ class Decimal(object):
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context.prec = firstprec
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if shouldround:
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return val._fix(context=context)
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return val._fix(context)
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return val
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def __rpow__(self, other, context=None):
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@ -1772,7 +1759,7 @@ class Decimal(object):
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if ans:
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return ans
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dup = self._fix(context=context)
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dup = self._fix(context)
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if dup._isinfinity():
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return dup
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@ -1786,7 +1773,7 @@ class Decimal(object):
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return Decimal( (dup._sign, dup._int[:end], exp) )
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def quantize(self, exp, rounding = None, context=None, watchexp = 1):
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def quantize(self, exp, rounding=None, context=None, watchexp=1):
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"""Quantize self so its exponent is the same as that of exp.
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Similar to self._rescale(exp._exp) but with error checking.
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@ -1817,7 +1804,7 @@ class Decimal(object):
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return self._isinfinity() and other._isinfinity() and True
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return self._exp == other._exp
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def _rescale(self, exp, rounding = None, context=None, watchexp = 1):
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def _rescale(self, exp, rounding=None, context=None, watchexp=1):
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"""Rescales so that the exponent is exp.
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exp = exp to scale to (an integer)
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@ -1848,13 +1835,13 @@ class Decimal(object):
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return ans
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diff = self._exp - exp
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digits = len(self._int)+diff
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digits = len(self._int) + diff
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if watchexp and digits > context.prec:
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return context._raise_error(InvalidOperation, 'Rescale > prec')
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tmp = Decimal(self)
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tmp._int = (0,)+tmp._int
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tmp._int = (0,) + tmp._int
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digits += 1
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prevexact = context.flags[Inexact]
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@ -1875,7 +1862,7 @@ class Decimal(object):
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return context._raise_error(InvalidOperation, 'rescale(a, INF)')
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return tmp
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def to_integral(self, rounding = None, context=None):
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def to_integral(self, rounding=None, context=None):
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"""Rounds to the nearest integer, without raising inexact, rounded."""
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if self._is_special:
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ans = self._check_nans(context=context)
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@ -1991,7 +1978,7 @@ class Decimal(object):
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context.prec = firstprec
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context.rounding = rounding
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ans = ans._fix(context=context)
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ans = ans._fix(context)
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rounding = context._set_rounding_decision(NEVER_ROUND)
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if not ans.__mul__(ans, context=context) == self:
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@ -2011,7 +1998,7 @@ class Decimal(object):
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context._regard_flags(flags)
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context.Emax, context.Emin = Emax, Emin
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return ans._fix(context=context)
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return ans._fix(context)
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def max(self, other, context=None):
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"""Returns the larger value.
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@ -2057,7 +2044,7 @@ class Decimal(object):
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if context is None:
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context = getcontext()
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context._rounding_decision == ALWAYS_ROUND
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return ans._fix(context=context)
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return ans._fix(context)
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def min(self, other, context=None):
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"""Returns the smaller value.
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@ -2103,7 +2090,7 @@ class Decimal(object):
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if context is None:
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context = getcontext()
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context._rounding_decision == ALWAYS_ROUND
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return ans._fix(context=context)
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return ans._fix(context)
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def _isinteger(self):
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"""Returns whether self is an integer"""
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@ -2316,7 +2303,7 @@ class Context(object):
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def create_decimal(self, num='0'):
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"""Creates a new Decimal instance but using self as context."""
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d = Decimal(num, context=self)
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return d._fix(context=self)
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return d._fix(self)
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#Methods
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def abs(self, a):
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@ -2348,7 +2335,7 @@ class Context(object):
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return a.__add__(b, context=self)
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def _apply(self, a):
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return str(a._fix(context=self))
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return str(a._fix(self))
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def compare(self, a, b):
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"""Compares values numerically.
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