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floatobject.py
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floatobject.py
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import operator
import math
import sys
from rpython.rlib.objectmodel import compute_hash
from rpython.rlib.rarithmetic import ovfcheck_float_to_int
from rpython.rlib.rbigint import rbigint
from rpython.rlib.rfloat import (formatd, DTSF_ADD_DOT_0, DTSF_STR_PRECISION,
NAN, INFINITY, isfinite, round_away)
from topaz.error import RubyError
from topaz.module import ClassDef
from topaz.objects.exceptionobject import W_ArgumentError
from topaz.objects.objectobject import W_RootObject
from topaz.objects.numericobject import W_NumericObject
class FloatStorage(object):
def __init__(self, space):
self.storages = {}
def get_or_create(self, space, floatvalue):
try:
storage = self.storages[floatvalue]
except KeyError:
self.storages[floatvalue] = storage = space.send(space.w_object, "new")
return storage
class W_FloatObject(W_RootObject):
_immutable_fields_ = ["floatvalue"]
classdef = ClassDef("Float", W_NumericObject.classdef)
def __init__(self, space, floatvalue):
self.floatvalue = floatvalue
def __deepcopy__(self, memo):
obj = super(W_FloatObject, self).__deepcopy__(memo)
obj.floatvalue = self.floatvalue
return obj
def float_w(self, space):
return self.floatvalue
def bigint_w(self, space):
return rbigint.fromfloat(self.floatvalue)
@staticmethod
def float_to_w_int(space, floatvalue):
try:
# the extra case makes sure that this method returns
# bignums for the same numbers as the parser does.
# this is checked in rubyspecs
if floatvalue < 0:
return space.newint(-ovfcheck_float_to_int(-floatvalue))
else:
return space.newint(ovfcheck_float_to_int(floatvalue))
except OverflowError:
return space.newbigint_fromfloat(floatvalue)
@classdef.setup_class
def setup_class(cls, space, w_cls):
space.set_const(w_cls, "MAX", space.newfloat(sys.float_info.max))
space.set_const(w_cls, "MIN", space.newfloat(sys.float_info.min))
space.set_const(w_cls, "INFINITY", space.newfloat(INFINITY))
space.set_const(w_cls, "NAN", space.newfloat(NAN))
space.set_const(w_cls, "DIG", space.newint(sys.float_info.dig))
space.set_const(w_cls, "EPSILON", space.newfloat(sys.float_info.epsilon))
space.set_const(w_cls, "MANT_DIG", space.newint(sys.float_info.mant_dig))
space.set_const(w_cls, "MAX_10_EXP", space.newint(sys.float_info.max_10_exp))
space.set_const(w_cls, "MIN_10_EXP", space.newint(sys.float_info.min_10_exp))
space.set_const(w_cls, "MAX_EXP", space.newint(sys.float_info.max_exp))
space.set_const(w_cls, "MIN_EXP", space.newint(sys.float_info.min_exp))
space.set_const(w_cls, "RADIX", space.newint(sys.float_info.radix))
def find_instance_var(self, space, name):
storage = space.fromcache(FloatStorage).get_or_create(space, self.floatvalue)
return storage.find_instance_var(space, name)
def set_instance_var(self, space, name, w_value):
storage = space.fromcache(FloatStorage).get_or_create(space, self.floatvalue)
storage.set_instance_var(space, name, w_value)
def set_flag(self, space, name):
storage = space.fromcache(FloatStorage).get_or_create(space, self.floatvalue)
storage.set_flag(space, name)
def unset_flag(self, space, name):
storage = space.fromcache(FloatStorage).get_or_create(space, self.floatvalue)
storage.unset_flag(space, name)
def get_flag(self, space, name):
storage = space.fromcache(FloatStorage).get_or_create(space, self.floatvalue)
return storage.get_flag(space, name)
@classdef.method("inspect")
@classdef.method("to_s")
def method_to_s(self, space):
if math.isinf(self.floatvalue):
if self.floatvalue >= 0:
return space.newstr_fromstr("Infinity")
else:
return space.newstr_fromstr("-Infinity")
elif math.isnan(self.floatvalue):
return space.newstr_fromstr("NaN")
else:
return space.newstr_fromstr(formatd(self.floatvalue, "g", DTSF_STR_PRECISION, DTSF_ADD_DOT_0))
@classdef.method("to_f")
def method_to_f(self, space):
return self
@classdef.method("to_i")
def method_to_i(self, space):
if math.isnan(self.floatvalue) or math.isinf(self.floatvalue):
raise space.error(
space.w_FloatDomainError,
space.str_w(space.send(self, "to_s"))
)
return self.float_to_w_int(space, self.floatvalue)
@classdef.method("+", other="float")
def method_add(self, space, other):
return space.newfloat(self.floatvalue + other)
@classdef.method("-", other="float")
def method_sub(self, space, other):
return space.newfloat(self.floatvalue - other)
@classdef.method("*", other="float")
def method_mul(self, space, other):
return space.newfloat(self.floatvalue * other)
@classdef.method("/", other="float")
def method_div(self, space, other):
if other == 0.0:
if self.floatvalue == 0.0:
return space.newfloat(NAN)
else:
inf = math.copysign(INFINITY, other)
if self.floatvalue < 0.0:
return space.newfloat(-inf)
else:
return space.newfloat(inf)
else:
return space.newfloat(self.floatvalue / other)
def new_bool_op(classdef, name, func):
@classdef.method(name)
def method(self, space, w_other):
if space.is_kind_of(w_other, space.w_float):
return space.newbool(func(self.floatvalue, space.float_w(w_other)))
else:
return W_NumericObject.retry_binop_coercing(space, self, w_other, name)
method.__name__ = "method_%s" % func.__name__
return method
method_lt = new_bool_op(classdef, "<", operator.lt)
method_lte = new_bool_op(classdef, "<=", operator.le)
method_gt = new_bool_op(classdef, ">", operator.gt)
method_gte = new_bool_op(classdef, ">=", operator.ge)
@classdef.method("==")
def method_eq(self, space, w_other):
if space.is_kind_of(w_other, space.w_float):
return space.newbool(self.floatvalue == space.float_w(w_other))
try:
return W_NumericObject.retry_binop_coercing(space, self, w_other, "==")
except RubyError as e:
if isinstance(e.w_value, W_ArgumentError):
space.mark_topframe_not_escaped()
return space.send(w_other, "==", [self])
else:
raise
@classdef.method("equal?")
def method_equalp(self, space, w_other):
if space.is_kind_of(w_other, space.w_float):
other = space.float_w(w_other)
return space.newbool(
self.floatvalue == other or
(math.isnan(self.floatvalue) and math.isnan(other))
)
try:
return W_NumericObject.retry_binop_coercing(space, self, w_other, "equal?")
except RubyError as e:
if isinstance(e.w_value, W_ArgumentError):
space.mark_topframe_not_escaped()
return space.send(w_other, "equal?", [self])
else:
raise
@classdef.method("<=>")
def method_comparator(self, space, w_other):
if space.is_kind_of(w_other, space.w_numeric):
other = space.float_w(w_other)
if self.floatvalue < other:
return space.newint(-1)
elif self.floatvalue == other:
return space.newint(0)
elif self.floatvalue > other:
return space.newint(1)
return space.newint(1)
else:
return space.w_nil
@classdef.method("hash")
def method_hash(self, space):
return space.newint(compute_hash(self.floatvalue))
@classdef.method("floor")
def method_floor(self, space):
return space.newint(int(math.floor(self.floatvalue)))
@classdef.method("coerce")
def method_coerce(self, space, w_other):
if space.getclass(w_other) is space.getclass(self):
return space.newarray([w_other, self])
else:
return space.newarray([space.send(self, "Float", [w_other]), self])
@classdef.method("abs")
def method_abs(self, space):
return space.newfloat(abs(self.floatvalue))
@classdef.method("**")
def method_pow(self, space, w_other):
if space.is_kind_of(w_other, space.w_numeric):
x = self.floatvalue
y = space.float_w(w_other)
negate_result = False
if y == 2.0:
return space.newfloat(x * x)
elif y == 0.0:
return space.newfloat(1.0)
elif math.isnan(x):
return space.newfloat(x)
elif math.isnan(y):
if x == 1.0:
return space.newfloat(1.0)
elif x < 0.0:
raise space.error(
space.w_NotImplementedError,
"Complex numbers as results"
)
else:
return space.newfloat(y)
elif math.isinf(y):
if x == 1.0 or x == -1.0:
return space.newfloat(x)
elif x < -1.0 or x > 1.0:
return space.newfloat(INFINITY if y > 0.0 else 0.0)
else:
return space.newfloat(0.0 if y > 0.0 else INFINITY)
elif x == 0.0 and y < 0.0:
return space.newfloat(INFINITY)
if x < 0.0:
x = -x
negate_result = math.fmod(abs(y), 2.0) == 1.0
if math.isinf(x):
if y > 0.0:
return space.newfloat(-INFINITY if negate_result else INFINITY)
else:
return space.newfloat(-0.0 if negate_result else 0.0)
elif x == 1.0:
return space.newfloat(-1.0 if negate_result else 1.0)
else:
try:
# OverflowError raised in math.pow, but not overflow.pow
z = math.pow(x, y)
except OverflowError:
return space.newfloat(-INFINITY if negate_result else INFINITY)
except ValueError:
return space.newfloat(NAN)
return space.newfloat(-z if negate_result else z)
else:
raise space.error(
space.w_TypeError,
"%s can't be coerced into Float" % space.getclass(w_other).name
)
@classdef.method("floor")
def method_floor(self, space):
return self.float_to_w_int(space, math.floor(self.floatvalue))
@classdef.method("ceil")
def method_ceil(self, space):
return self.float_to_w_int(space, math.ceil(self.floatvalue))
@classdef.method("infinite?")
def method_infinity(self, space):
if math.isinf(self.floatvalue):
return space.newint(int(math.copysign(1, self.floatvalue)))
return space.w_nil
@classdef.method("finite?")
def method_finite(self, space):
return space.newbool(isfinite(self.floatvalue))
@classdef.method("nan?")
def method_nan(self, space):
return space.newbool(math.isnan(self.floatvalue))
@classdef.method("round")
def method_round(self, space):
return space.newint(int(round_away(self.floatvalue)))
@classdef.method("quo")
def method_quo(self, space):
raise space.error(space.w_NotImplementedError, "Numeric#quo")
@classdef.method("divmod")
def method_divmod(self, space, w_other):
if math.isnan(self.floatvalue) or math.isinf(self.floatvalue):
raise space.error(
space.w_FloatDomainError,
space.obj_to_s(space.getclass(w_other))
)
if (space.is_kind_of(w_other, space.w_fixnum) or
space.is_kind_of(w_other, space.w_bignum) or
space.is_kind_of(w_other, space.w_float)):
y = space.float_w(w_other)
if math.isnan(y):
raise space.error(
space.w_FloatDomainError,
space.obj_to_s(space.getclass(w_other))
)
x = self.floatvalue
mod = space.float_w(self.method_mod_float_impl(space, y))
# TAKEN FROM: pypy/module/cpytext/floatobject.py
div = (x - mod) / y
if (mod):
# ensure the remainder has the same sign as the denominator
if ((y < 0.0) != (mod < 0.0)):
mod += y
div -= 1.0
else:
mod *= mod # hide "mod = +0" from optimizer
if y < 0.0:
mod = -mod
# snap quotient to nearest integral value
if div:
floordiv = math.floor(div)
if (div - floordiv > 0.5):
floordiv += 1.0
else:
# div is zero - get the same sign as the true quotient
div *= div # hide "div = +0" from optimizers
floordiv = div * x / y # zero w/ sign of vx/wx
try:
return space.newarray([self.float_to_w_int(space, round_away(div)), space.newfloat(mod)])
except OverflowError:
return space.newarray([space.newbigint_fromfloat(div), space.newfloat(mod)])
else:
raise space.error(
space.w_TypeError,
"%s can't be coerced into Float" % (
space.obj_to_s(space.getclass(w_other))
)
)
@classdef.method("%")
@classdef.method("modulo")
def method_mod(self, space, w_other):
if (space.is_kind_of(w_other, space.w_fixnum) or
space.is_kind_of(w_other, space.w_bignum) or
space.is_kind_of(w_other, space.w_float)):
return self.method_mod_float_impl(space, space.float_w(w_other))
else:
raise space.error(
space.w_TypeError,
"%s can't be coerced into Float" % (
space.obj_to_s(space.getclass(w_other))
)
)
def method_mod_float_impl(self, space, other):
if other == 0.0:
raise space.error(space.w_ZeroDivisionError, "divided by 0")
elif self.floatvalue == -0.0:
return space.newfloat(-0.0)
elif math.isinf(other) and other < 0.0:
return space.newfloat(other)
elif math.isnan(self.floatvalue) or math.isinf(self.floatvalue):
return space.newfloat(NAN)
return space.newfloat(math.fmod(self.floatvalue, other))