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objfloat.rs
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651 lines (581 loc) · 21 KB
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use super::objbytes;
use super::objint;
use super::objstr;
use super::objtype;
use crate::function::OptionalArg;
use crate::obj::objstr::PyStringRef;
use crate::obj::objtype::PyClassRef;
use crate::pyhash;
use crate::pyobject::{
IdProtocol, IntoPyObject, PyClassImpl, PyContext, PyObjectRef, PyRef, PyResult, PyValue,
TryFromObject, TypeProtocol,
};
use crate::vm::VirtualMachine;
use hexf_parse;
use num_bigint::{BigInt, ToBigInt};
use num_rational::Ratio;
use num_traits::{float::Float, sign::Signed, ToPrimitive, Zero};
/// Convert a string or number to a floating point number, if possible.
#[pyclass(name = "float")]
#[derive(Debug, Copy, Clone, PartialEq)]
pub struct PyFloat {
value: f64,
}
impl PyFloat {
pub fn to_f64(self) -> f64 {
self.value
}
}
impl PyValue for PyFloat {
fn class(vm: &VirtualMachine) -> PyClassRef {
vm.ctx.float_type()
}
}
impl IntoPyObject for f64 {
fn into_pyobject(self, vm: &VirtualMachine) -> PyResult {
Ok(vm.ctx.new_float(self))
}
}
impl IntoPyObject for f32 {
fn into_pyobject(self, vm: &VirtualMachine) -> PyResult {
Ok(vm.ctx.new_float(f64::from(self)))
}
}
impl From<f64> for PyFloat {
fn from(value: f64) -> Self {
PyFloat { value }
}
}
pub fn try_float(value: &PyObjectRef, vm: &VirtualMachine) -> PyResult<Option<f64>> {
Ok(if objtype::isinstance(&value, &vm.ctx.float_type()) {
Some(get_value(&value))
} else if objtype::isinstance(&value, &vm.ctx.int_type()) {
Some(objint::get_float_value(&value, vm)?)
} else {
None
})
}
macro_rules! impl_try_from_object_float {
($($t:ty),*) => {
$(impl TryFromObject for $t {
fn try_from_object(vm: &VirtualMachine, obj: PyObjectRef) -> PyResult<Self> {
PyFloatRef::try_from_object(vm, obj).map(|f| f.to_f64() as $t)
}
})*
};
}
impl_try_from_object_float!(f32, f64);
fn inner_div(v1: f64, v2: f64, vm: &VirtualMachine) -> PyResult<f64> {
if v2 != 0.0 {
Ok(v1 / v2)
} else {
Err(vm.new_zero_division_error("float division by zero".to_string()))
}
}
fn inner_mod(v1: f64, v2: f64, vm: &VirtualMachine) -> PyResult<f64> {
if v2 != 0.0 {
Ok(v1 % v2)
} else {
Err(vm.new_zero_division_error("float mod by zero".to_string()))
}
}
fn try_to_bigint(value: f64, vm: &VirtualMachine) -> PyResult<BigInt> {
match value.to_bigint() {
Some(int) => Ok(int),
None => {
if value.is_infinite() {
Err(vm.new_overflow_error(
"OverflowError: cannot convert float infinity to integer".to_string(),
))
} else if value.is_nan() {
Err(vm
.new_value_error("ValueError: cannot convert float NaN to integer".to_string()))
} else {
// unreachable unless BigInt has a bug
unreachable!(
"A finite float value failed to be converted to bigint: {}",
value
)
}
}
}
}
fn inner_floordiv(v1: f64, v2: f64, vm: &VirtualMachine) -> PyResult<f64> {
if v2 != 0.0 {
Ok((v1 / v2).floor())
} else {
Err(vm.new_zero_division_error("float floordiv by zero".to_string()))
}
}
fn inner_divmod(v1: f64, v2: f64, vm: &VirtualMachine) -> PyResult<(f64, f64)> {
if v2 != 0.0 {
Ok(((v1 / v2).floor(), v1 % v2))
} else {
Err(vm.new_zero_division_error("float divmod()".to_string()))
}
}
fn inner_lt_int(value: f64, other_int: &BigInt) -> bool {
match (value.to_bigint(), other_int.to_f64()) {
(Some(self_int), Some(other_float)) => value < other_float || self_int < *other_int,
// finite float, other_int too big for float,
// the result depends only on other_int’s sign
(Some(_), None) => other_int.is_positive(),
// infinite float must be bigger or lower than any int, depending on its sign
_ if value.is_infinite() => value.is_sign_negative(),
// NaN, always false
_ => false,
}
}
fn inner_gt_int(value: f64, other_int: &BigInt) -> bool {
match (value.to_bigint(), other_int.to_f64()) {
(Some(self_int), Some(other_float)) => value > other_float || self_int > *other_int,
// finite float, other_int too big for float,
// the result depends only on other_int’s sign
(Some(_), None) => other_int.is_negative(),
// infinite float must be bigger or lower than any int, depending on its sign
_ if value.is_infinite() => value.is_sign_positive(),
// NaN, always false
_ => false,
}
}
#[pyimpl]
#[allow(clippy::trivially_copy_pass_by_ref)]
impl PyFloat {
#[pymethod(name = "__eq__")]
fn eq(&self, other: PyObjectRef, vm: &VirtualMachine) -> PyObjectRef {
let value = self.value;
let result = if objtype::isinstance(&other, &vm.ctx.float_type()) {
let other = get_value(&other);
value == other
} else if objtype::isinstance(&other, &vm.ctx.int_type()) {
let other_int = objint::get_value(&other);
if let (Some(self_int), Some(other_float)) = (value.to_bigint(), other_int.to_f64()) {
value == other_float && self_int == *other_int
} else {
false
}
} else {
return vm.ctx.not_implemented();
};
vm.ctx.new_bool(result)
}
#[pymethod(name = "__lt__")]
fn lt(&self, i2: PyObjectRef, vm: &VirtualMachine) -> PyObjectRef {
let v1 = self.value;
if objtype::isinstance(&i2, &vm.ctx.float_type()) {
vm.ctx.new_bool(v1 < get_value(&i2))
} else if objtype::isinstance(&i2, &vm.ctx.int_type()) {
let other_int = objint::get_value(&i2);
vm.ctx.new_bool(inner_lt_int(self.value, other_int))
} else {
vm.ctx.not_implemented()
}
}
#[pymethod(name = "__le__")]
fn le(&self, i2: PyObjectRef, vm: &VirtualMachine) -> PyObjectRef {
let v1 = self.value;
if objtype::isinstance(&i2, &vm.ctx.float_type()) {
vm.ctx.new_bool(v1 <= get_value(&i2))
} else if objtype::isinstance(&i2, &vm.ctx.int_type()) {
let other_int = objint::get_value(&i2);
let result = if let (Some(self_int), Some(other_float)) =
(self.value.to_bigint(), other_int.to_f64())
{
self.value <= other_float && self_int <= *other_int
} else {
// certainly not equal, forward to inner_lt_int
inner_lt_int(self.value, other_int)
};
vm.ctx.new_bool(result)
} else {
vm.ctx.not_implemented()
}
}
#[pymethod(name = "__gt__")]
fn gt(&self, i2: PyObjectRef, vm: &VirtualMachine) -> PyObjectRef {
let v1 = self.value;
if objtype::isinstance(&i2, &vm.ctx.float_type()) {
vm.ctx.new_bool(v1 > get_value(&i2))
} else if objtype::isinstance(&i2, &vm.ctx.int_type()) {
let other_int = objint::get_value(&i2);
vm.ctx.new_bool(inner_gt_int(self.value, other_int))
} else {
vm.ctx.not_implemented()
}
}
#[pymethod(name = "__ge__")]
fn ge(&self, i2: PyObjectRef, vm: &VirtualMachine) -> PyObjectRef {
let v1 = self.value;
if objtype::isinstance(&i2, &vm.ctx.float_type()) {
vm.ctx.new_bool(v1 >= get_value(&i2))
} else if objtype::isinstance(&i2, &vm.ctx.int_type()) {
let other_int = objint::get_value(&i2);
let result = if let (Some(self_int), Some(other_float)) =
(self.value.to_bigint(), other_int.to_f64())
{
self.value >= other_float && self_int >= *other_int
} else {
// certainly not equal, forward to inner_gt_int
inner_gt_int(self.value, other_int)
};
vm.ctx.new_bool(result)
} else {
vm.ctx.not_implemented()
}
}
#[pymethod(name = "__abs__")]
fn abs(&self, _vm: &VirtualMachine) -> f64 {
self.value.abs()
}
#[pymethod(name = "__add__")]
fn add(&self, other: PyObjectRef, vm: &VirtualMachine) -> PyResult {
try_float(&other, vm)?.map_or_else(
|| Ok(vm.ctx.not_implemented()),
|other| (self.value + other).into_pyobject(vm),
)
}
#[pymethod(name = "__radd__")]
fn radd(&self, other: PyObjectRef, vm: &VirtualMachine) -> PyResult {
self.add(other, vm)
}
#[pymethod(name = "__bool__")]
fn bool(&self, _vm: &VirtualMachine) -> bool {
self.value != 0.0
}
#[pymethod(name = "__divmod__")]
fn divmod(&self, other: PyObjectRef, vm: &VirtualMachine) -> PyResult {
try_float(&other, vm)?.map_or_else(
|| Ok(vm.ctx.not_implemented()),
|other| {
let (r1, r2) = inner_divmod(self.value, other, vm)?;
Ok(vm
.ctx
.new_tuple(vec![vm.ctx.new_float(r1), vm.ctx.new_float(r2)]))
},
)
}
#[pymethod(name = "__rdivmod__")]
fn rdivmod(&self, other: PyObjectRef, vm: &VirtualMachine) -> PyResult {
try_float(&other, vm)?.map_or_else(
|| Ok(vm.ctx.not_implemented()),
|other| {
let (r1, r2) = inner_divmod(other, self.value, vm)?;
Ok(vm
.ctx
.new_tuple(vec![vm.ctx.new_float(r1), vm.ctx.new_float(r2)]))
},
)
}
#[pymethod(name = "__floordiv__")]
fn floordiv(&self, other: PyObjectRef, vm: &VirtualMachine) -> PyResult {
try_float(&other, vm)?.map_or_else(
|| Ok(vm.ctx.not_implemented()),
|other| inner_floordiv(self.value, other, vm)?.into_pyobject(vm),
)
}
#[pymethod(name = "__rfloordiv__")]
fn rfloordiv(&self, other: PyObjectRef, vm: &VirtualMachine) -> PyResult {
try_float(&other, vm)?.map_or_else(
|| Ok(vm.ctx.not_implemented()),
|other| inner_floordiv(other, self.value, vm)?.into_pyobject(vm),
)
}
#[pymethod(name = "__new__")]
fn float_new(cls: PyClassRef, arg: PyObjectRef, vm: &VirtualMachine) -> PyResult<PyFloatRef> {
let value = if objtype::isinstance(&arg, &vm.ctx.float_type()) {
get_value(&arg)
} else if objtype::isinstance(&arg, &vm.ctx.int_type()) {
objint::get_float_value(&arg, vm)?
} else if objtype::isinstance(&arg, &vm.ctx.str_type()) {
match lexical::try_parse(objstr::get_value(&arg)) {
Ok(f) => f,
Err(_) => {
let arg_repr = vm.to_pystr(&arg)?;
return Err(vm.new_value_error(format!(
"could not convert string to float: '{}'",
arg_repr
)));
}
}
} else if objtype::isinstance(&arg, &vm.ctx.bytes_type()) {
match lexical::try_parse(objbytes::get_value(&arg).as_slice()) {
Ok(f) => f,
Err(_) => {
let arg_repr = vm.to_pystr(&arg)?;
return Err(vm.new_value_error(format!(
"could not convert string to float: '{}'",
arg_repr
)));
}
}
} else {
return Err(vm.new_type_error(format!("can't convert {} to float", arg.class().name)));
};
PyFloat { value }.into_ref_with_type(vm, cls)
}
#[pymethod(name = "__mod__")]
fn mod_(&self, other: PyObjectRef, vm: &VirtualMachine) -> PyResult {
try_float(&other, vm)?.map_or_else(
|| Ok(vm.ctx.not_implemented()),
|other| inner_mod(self.value, other, vm)?.into_pyobject(vm),
)
}
#[pymethod(name = "__rmod__")]
fn rmod(&self, other: PyObjectRef, vm: &VirtualMachine) -> PyResult {
try_float(&other, vm)?.map_or_else(
|| Ok(vm.ctx.not_implemented()),
|other| inner_mod(other, self.value, vm)?.into_pyobject(vm),
)
}
#[pymethod(name = "__pos__")]
fn pos(&self, _vm: &VirtualMachine) -> f64 {
self.value
}
#[pymethod(name = "__neg__")]
fn neg(&self, _vm: &VirtualMachine) -> f64 {
-self.value
}
#[pymethod(name = "__pow__")]
fn pow(&self, other: PyObjectRef, vm: &VirtualMachine) -> PyResult {
try_float(&other, vm)?.map_or_else(
|| Ok(vm.ctx.not_implemented()),
|other| self.value.powf(other).into_pyobject(vm),
)
}
#[pymethod(name = "__rpow__")]
fn rpow(&self, other: PyObjectRef, vm: &VirtualMachine) -> PyResult {
try_float(&other, vm)?.map_or_else(
|| Ok(vm.ctx.not_implemented()),
|other| other.powf(self.value).into_pyobject(vm),
)
}
#[pymethod(name = "__sub__")]
fn sub(&self, other: PyObjectRef, vm: &VirtualMachine) -> PyResult {
try_float(&other, vm)?.map_or_else(
|| Ok(vm.ctx.not_implemented()),
|other| (self.value - other).into_pyobject(vm),
)
}
#[pymethod(name = "__rsub__")]
fn rsub(&self, other: PyObjectRef, vm: &VirtualMachine) -> PyResult {
try_float(&other, vm)?.map_or_else(
|| Ok(vm.ctx.not_implemented()),
|other| (other - self.value).into_pyobject(vm),
)
}
#[pymethod(name = "__repr__")]
fn repr(&self, vm: &VirtualMachine) -> String {
if self.is_integer(vm) {
format!("{:.1}", self.value)
} else {
self.value.to_string()
}
}
#[pymethod(name = "__truediv__")]
fn truediv(&self, other: PyObjectRef, vm: &VirtualMachine) -> PyResult {
try_float(&other, vm)?.map_or_else(
|| Ok(vm.ctx.not_implemented()),
|other| inner_div(self.value, other, vm)?.into_pyobject(vm),
)
}
#[pymethod(name = "__rtruediv__")]
fn rtruediv(&self, other: PyObjectRef, vm: &VirtualMachine) -> PyResult {
try_float(&other, vm)?.map_or_else(
|| Ok(vm.ctx.not_implemented()),
|other| inner_div(other, self.value, vm)?.into_pyobject(vm),
)
}
#[pymethod(name = "__mul__")]
fn mul(&self, other: PyObjectRef, vm: &VirtualMachine) -> PyResult {
try_float(&other, vm)?.map_or_else(
|| Ok(vm.ctx.not_implemented()),
|other| (self.value * other).into_pyobject(vm),
)
}
#[pymethod(name = "__rmul__")]
fn rmul(&self, other: PyObjectRef, vm: &VirtualMachine) -> PyResult {
self.mul(other, vm)
}
#[pymethod(name = "__trunc__")]
fn trunc(&self, vm: &VirtualMachine) -> PyResult<BigInt> {
try_to_bigint(self.value, vm)
}
#[pymethod(name = "__round__")]
fn round(&self, ndigits: OptionalArg<PyObjectRef>, vm: &VirtualMachine) -> PyResult {
let ndigits = match ndigits {
OptionalArg::Missing => None,
OptionalArg::Present(ref value) => {
if !vm.get_none().is(value) {
if !objtype::isinstance(value, &vm.ctx.int_type()) {
return Err(vm.new_type_error(format!(
"'{}' object cannot be interpreted as an integer",
value.class().name
)));
};
// Only accept int type ndigits
let ndigits = objint::get_value(value);
Some(ndigits)
} else {
None
}
}
};
if let Some(ndigits) = ndigits {
if ndigits.is_zero() {
let fract = self.value.fract();
let value = if (fract.abs() - 0.5).abs() < std::f64::EPSILON {
if self.value.trunc() % 2.0 == 0.0 {
self.value - fract
} else {
self.value + fract
}
} else {
self.value.round()
};
Ok(vm.ctx.new_float(value))
} else {
Ok(vm.ctx.not_implemented())
}
} else {
let fract = self.value.fract();
let value = if (fract.abs() - 0.5).abs() < std::f64::EPSILON {
if self.value.trunc() % 2.0 == 0.0 {
self.value - fract
} else {
self.value + fract
}
} else {
self.value.round()
};
let int = try_to_bigint(value, vm)?;
Ok(vm.ctx.new_int(int))
}
}
#[pymethod(name = "__int__")]
fn int(&self, vm: &VirtualMachine) -> PyResult<BigInt> {
self.trunc(vm)
}
#[pymethod(name = "__float__")]
fn float(zelf: PyRef<Self>, _vm: &VirtualMachine) -> PyFloatRef {
zelf
}
#[pymethod(name = "__hash__")]
fn hash(&self, _vm: &VirtualMachine) -> pyhash::PyHash {
pyhash::hash_float(self.value)
}
#[pyproperty(name = "real")]
fn real(zelf: PyRef<Self>, _vm: &VirtualMachine) -> PyFloatRef {
zelf
}
#[pyproperty(name = "imag")]
fn imag(&self, _vm: &VirtualMachine) -> f64 {
0.0f64
}
#[pymethod(name = "conjugate")]
fn conjugate(zelf: PyRef<Self>, _vm: &VirtualMachine) -> PyFloatRef {
zelf
}
#[pymethod(name = "is_integer")]
fn is_integer(&self, _vm: &VirtualMachine) -> bool {
let v = self.value;
(v - v.round()).abs() < std::f64::EPSILON
}
#[pymethod(name = "as_integer_ratio")]
fn as_integer_ratio(&self, vm: &VirtualMachine) -> PyResult {
let value = self.value;
if value.is_infinite() {
return Err(
vm.new_overflow_error("cannot convert Infinity to integer ratio".to_string())
);
}
if value.is_nan() {
return Err(vm.new_value_error("cannot convert NaN to integer ratio".to_string()));
}
let ratio = Ratio::from_float(value).unwrap();
let numer = vm.ctx.new_int(ratio.numer().clone());
let denom = vm.ctx.new_int(ratio.denom().clone());
Ok(vm.ctx.new_tuple(vec![numer, denom]))
}
#[pymethod]
fn fromhex(repr: PyStringRef, vm: &VirtualMachine) -> PyResult<f64> {
hexf_parse::parse_hexf64(&repr.value, false).or_else(|_| match repr.value.as_ref() {
"nan" => Ok(std::f64::NAN),
"inf" => Ok(std::f64::INFINITY),
"-inf" => Ok(std::f64::NEG_INFINITY),
_ => Err(vm.new_value_error("invalid hexadecimal floating-point string".to_string())),
})
}
#[pymethod]
fn hex(&self, _vm: &VirtualMachine) -> String {
to_hex(self.value)
}
}
fn to_hex(value: f64) -> String {
let (mantissa, exponent, sign) = value.integer_decode();
let sign_fmt = if sign < 0 { "-" } else { "" };
match value {
value if value.is_zero() => format!("{}0x0.0p+0", sign_fmt),
value if value.is_infinite() => format!("{}inf", sign_fmt),
value if value.is_nan() => "nan".to_string(),
_ => {
const BITS: i16 = 52;
const FRACT_MASK: u64 = 0xf_ffff_ffff_ffff;
format!(
"{}0x{:x}.{:013x}p{:+}",
sign_fmt,
mantissa >> BITS,
mantissa & FRACT_MASK,
exponent + BITS
)
}
}
}
#[test]
fn test_to_hex() {
use rand::Rng;
for _ in 0..20000 {
let bytes = rand::thread_rng().gen::<[u64; 1]>();
let f = f64::from_bits(bytes[0]);
if !f.is_finite() {
continue;
}
let hex = to_hex(f);
// println!("{} -> {}", f, hex);
let roundtrip = hexf_parse::parse_hexf64(&hex, false).unwrap();
// println!(" -> {}", roundtrip);
assert!(f == roundtrip, "{} {} {}", f, hex, roundtrip);
}
}
pub fn ufrexp(value: f64) -> (f64, i32) {
if 0.0 == value {
(0.0, 0i32)
} else {
let bits = value.to_bits();
let exponent: i32 = ((bits >> 52) & 0x7ff) as i32 - 1022;
let mantissa_bits = bits & (0x000f_ffff_ffff_ffff) | (1022 << 52);
(f64::from_bits(mantissa_bits), exponent)
}
}
pub type PyFloatRef = PyRef<PyFloat>;
// Retrieve inner float value:
pub fn get_value(obj: &PyObjectRef) -> f64 {
obj.payload::<PyFloat>().unwrap().value
}
pub fn make_float(vm: &VirtualMachine, obj: &PyObjectRef) -> PyResult<f64> {
if objtype::isinstance(obj, &vm.ctx.float_type()) {
Ok(get_value(obj))
} else {
let method = vm.get_method_or_type_error(obj.clone(), "__float__", || {
format!(
"float() argument must be a string or a number, not '{}'",
obj.class().name
)
})?;
let result = vm.invoke(&method, vec![])?;
Ok(get_value(&result))
}
}
#[rustfmt::skip] // to avoid line splitting
pub fn init(context: &PyContext) {
PyFloat::extend_class(context, &context.types.float_type);
}