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use std::fmt;
use rb_sys::{
rb_float_new_in_heap, rb_float_value, rb_flt_rationalize, rb_flt_rationalize_with_prec,
rb_to_float, ruby_value_type, VALUE,
};
#[cfg(ruby_use_flonum)]
use crate::value::Flonum;
use crate::{
error::{protect, Error},
into_value::IntoValue,
numeric::Numeric,
r_rational::RRational,
try_convert::TryConvert,
value::{
private::{self, ReprValue as _},
NonZeroValue, ReprValue, Value,
},
Ruby,
};
/// # `Float`
///
/// Functions that can be used to create instances of [`Float`].
///
/// See also the [`Float`] type.
impl Ruby {
/// Create a new `Float` from an `f64`.
///
/// # Examples
///
/// ```
/// use magnus::{rb_assert, Error, Ruby};
///
/// fn example(ruby: &Ruby) -> Result<(), Error> {
/// let f = ruby.float_from_f64(1.7272337110188893e-77);
/// rb_assert!(ruby, "f == 1.7272337110188893e-77", f);
///
/// let f = ruby.float_from_f64(1.7272337110188890e-77);
/// rb_assert!(ruby, "f == 1.7272337110188890e-77", f);
///
/// Ok(())
/// }
/// # Ruby::init(example).unwrap()
/// ```
#[inline]
pub fn float_from_f64(&self, n: f64) -> Float {
unsafe {
#[cfg(ruby_use_flonum)]
let val = Flonum::from_f64_impl(n)
.map(|f| f.as_rb_value())
.unwrap_or_else(|| rb_float_new_in_heap(n));
#[cfg(not(ruby_use_flonum))]
let val = rb_float_new_in_heap(n);
Float::from_rb_value_unchecked(val)
}
}
}
/// A type wrapping either a [`Flonum`](crate::value::Flonum) or an
/// [`RFloat`](crate::r_float::RFloat) value.
///
/// See the [`ReprValue`] trait for additional methods available on this type.
/// See [`Ruby`](Ruby#float) for methods to create a `Float`.
#[derive(Clone, Copy)]
#[repr(transparent)]
pub struct Float(NonZeroValue);
impl Float {
/// Return `Some(Float)` if `val` is a `Float`, `None` otherwise.
///
/// # Examples
///
/// ```
/// use magnus::{eval, Float};
/// # let _cleanup = unsafe { magnus::embed::init() };
///
/// assert!(Float::from_value(eval("1.7272337110188893e-77").unwrap()).is_some());
/// assert!(Float::from_value(eval("1.7272337110188890e-77").unwrap()).is_some());
/// assert!(Float::from_value(eval("1").unwrap()).is_none());
/// ```
#[inline]
pub fn from_value(val: Value) -> Option<Self> {
unsafe {
if cfg!(ruby_use_flonum) && val.is_flonum() {
return Some(Self(NonZeroValue::new_unchecked(val)));
}
debug_assert_value!(val);
(val.rb_type() == ruby_value_type::RUBY_T_FLOAT)
.then(|| Self(NonZeroValue::new_unchecked(val)))
}
}
#[inline]
pub(crate) unsafe fn from_rb_value_unchecked(val: VALUE) -> Self {
Self(NonZeroValue::new_unchecked(Value::new(val)))
}
/// Create a new `Float` from an `f64`.
///
/// # Panics
///
/// Panics if called from a non-Ruby thread. See [`Ruby::float_from_f64`]
/// for the non-panicking version.
///
/// # Examples
///
/// ```
/// # #![allow(deprecated)]
/// use magnus::{rb_assert, Float};
/// # let _cleanup = unsafe { magnus::embed::init() };
///
/// let f = Float::from_f64(1.7272337110188893e-77);
/// rb_assert!("f == 1.7272337110188893e-77", f);
///
/// let f = Float::from_f64(1.7272337110188890e-77);
/// rb_assert!("f == 1.7272337110188890e-77", f);
/// ```
#[cfg_attr(
not(feature = "old-api"),
deprecated(note = "please use `Ruby::float_from_f64` instead")
)]
#[cfg_attr(docsrs, doc(cfg(feature = "old-api")))]
#[inline]
pub fn from_f64(n: f64) -> Self {
get_ruby!().float_from_f64(n)
}
/// Convert `self` to a `f64`.
///
/// # Examples
///
/// ```
/// use magnus::{eval, Float};
/// # let _cleanup = unsafe { magnus::embed::init() };
///
/// let f: Float = eval("2.0").unwrap();
/// assert_eq!(f.to_f64(), 2.0);
/// ```
#[inline]
pub fn to_f64(self) -> f64 {
#[cfg(ruby_use_flonum)]
if let Some(flonum) = Flonum::from_value(self.as_value()) {
return flonum.to_f64();
}
unsafe { rb_float_value(self.as_rb_value()) }
}
/// Returns a rational approximation of `self`.
///
/// # Examples
///
/// ```
/// use magnus::{rb_assert, Error, Ruby};
///
/// fn example(ruby: &Ruby) -> Result<(), Error> {
/// let pi = ruby.float_from_f64(3.141592);
///
/// let r = pi.rationalize_with_prec(ruby.float_from_f64(0.001));
/// rb_assert!(ruby, "r == 201/64r", r);
///
/// let r = pi.rationalize_with_prec(ruby.float_from_f64(0.01));
/// rb_assert!(ruby, "r == 22/7r", r);
///
/// let r = pi.rationalize_with_prec(ruby.float_from_f64(0.1));
/// rb_assert!(ruby, "r == 16/5r", r);
///
/// let r = pi.rationalize_with_prec(ruby.float_from_f64(1.));
/// rb_assert!(ruby, "r == 3/1r", r);
///
/// Ok(())
/// }
/// # Ruby::init(example).unwrap()
/// ```
pub fn rationalize_with_prec(self, prec: Self) -> RRational {
unsafe {
RRational::from_rb_value_unchecked(rb_flt_rationalize_with_prec(
self.as_rb_value(),
prec.as_rb_value(),
))
}
}
/// Returns a rational approximation of `self`.
///
/// # Examples
///
/// ```
/// use magnus::{rb_assert, Error, Ruby};
///
/// fn example(ruby: &Ruby) -> Result<(), Error> {
/// let pi = ruby.float_from_f64(3.141592);
/// rb_assert!(ruby, "r = 392699/125000r", r = pi.rationalize());
///
/// Ok(())
/// }
/// # Ruby::init(example).unwrap()
/// ```
pub fn rationalize(self) -> RRational {
unsafe { RRational::from_rb_value_unchecked(rb_flt_rationalize(self.as_rb_value())) }
}
}
impl fmt::Display for Float {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{}", unsafe { self.to_s_infallible() })
}
}
impl fmt::Debug for Float {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{}", self.inspect())
}
}
impl IntoValue for Float {
#[inline]
fn into_value_with(self, _: &Ruby) -> Value {
self.0.get()
}
}
unsafe impl private::ReprValue for Float {}
impl Numeric for Float {}
impl ReprValue for Float {}
impl TryConvert for Float {
fn try_convert(val: Value) -> Result<Self, Error> {
match Self::from_value(val) {
Some(i) => Ok(i),
None => protect(|| {
debug_assert_value!(val);
unsafe { Self::from_rb_value_unchecked(rb_to_float(val.as_rb_value())) }
}),
}
}
}