diff options
Diffstat (limited to 'vendor/ryu/src/buffer')
| -rw-r--r-- | vendor/ryu/src/buffer/mod.rs | 171 |
1 files changed, 0 insertions, 171 deletions
diff --git a/vendor/ryu/src/buffer/mod.rs b/vendor/ryu/src/buffer/mod.rs deleted file mode 100644 index 905ee2f..0000000 --- a/vendor/ryu/src/buffer/mod.rs +++ /dev/null @@ -1,171 +0,0 @@ -use crate::raw; -use core::mem::MaybeUninit; -use core::{slice, str}; -#[cfg(feature = "no-panic")] -use no_panic::no_panic; - -const NAN: &str = "NaN"; -const INFINITY: &str = "inf"; -const NEG_INFINITY: &str = "-inf"; - -/// Safe API for formatting floating point numbers to text. -/// -/// ## Example -/// -/// ``` -/// let mut buffer = ryu::Buffer::new(); -/// let printed = buffer.format_finite(1.234); -/// assert_eq!(printed, "1.234"); -/// ``` -pub struct Buffer { - bytes: [MaybeUninit<u8>; 24], -} - -impl Buffer { - /// This is a cheap operation; you don't need to worry about reusing buffers - /// for efficiency. - #[inline] - #[cfg_attr(feature = "no-panic", no_panic)] - pub fn new() -> Self { - let bytes = [MaybeUninit::<u8>::uninit(); 24]; - Buffer { bytes } - } - - /// Print a floating point number into this buffer and return a reference to - /// its string representation within the buffer. - /// - /// # Special cases - /// - /// This function formats NaN as the string "NaN", positive infinity as - /// "inf", and negative infinity as "-inf" to match std::fmt. - /// - /// If your input is known to be finite, you may get better performance by - /// calling the `format_finite` method instead of `format` to avoid the - /// checks for special cases. - #[cfg_attr(feature = "no-panic", inline)] - #[cfg_attr(feature = "no-panic", no_panic)] - pub fn format<F: Float>(&mut self, f: F) -> &str { - if f.is_nonfinite() { - f.format_nonfinite() - } else { - self.format_finite(f) - } - } - - /// Print a floating point number into this buffer and return a reference to - /// its string representation within the buffer. - /// - /// # Special cases - /// - /// This function **does not** check for NaN or infinity. If the input - /// number is not a finite float, the printed representation will be some - /// correctly formatted but unspecified numerical value. - /// - /// Please check [`is_finite`] yourself before calling this function, or - /// check [`is_nan`] and [`is_infinite`] and handle those cases yourself. - /// - /// [`is_finite`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_finite - /// [`is_nan`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_nan - /// [`is_infinite`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_infinite - #[inline] - #[cfg_attr(feature = "no-panic", no_panic)] - pub fn format_finite<F: Float>(&mut self, f: F) -> &str { - unsafe { - let n = f.write_to_ryu_buffer(self.bytes.as_mut_ptr() as *mut u8); - debug_assert!(n <= self.bytes.len()); - let slice = slice::from_raw_parts(self.bytes.as_ptr() as *const u8, n); - str::from_utf8_unchecked(slice) - } - } -} - -impl Copy for Buffer {} - -impl Clone for Buffer { - #[inline] - #[allow(clippy::non_canonical_clone_impl)] // false positive https://github.com/rust-lang/rust-clippy/issues/11072 - fn clone(&self) -> Self { - Buffer::new() - } -} - -impl Default for Buffer { - #[inline] - #[cfg_attr(feature = "no-panic", no_panic)] - fn default() -> Self { - Buffer::new() - } -} - -/// A floating point number, f32 or f64, that can be written into a -/// [`ryu::Buffer`][Buffer]. -/// -/// This trait is sealed and cannot be implemented for types outside of the -/// `ryu` crate. -pub trait Float: Sealed {} -impl Float for f32 {} -impl Float for f64 {} - -pub trait Sealed: Copy { - fn is_nonfinite(self) -> bool; - fn format_nonfinite(self) -> &'static str; - unsafe fn write_to_ryu_buffer(self, result: *mut u8) -> usize; -} - -impl Sealed for f32 { - #[inline] - fn is_nonfinite(self) -> bool { - const EXP_MASK: u32 = 0x7f800000; - let bits = self.to_bits(); - bits & EXP_MASK == EXP_MASK - } - - #[cold] - #[cfg_attr(feature = "no-panic", inline)] - fn format_nonfinite(self) -> &'static str { - const MANTISSA_MASK: u32 = 0x007fffff; - const SIGN_MASK: u32 = 0x80000000; - let bits = self.to_bits(); - if bits & MANTISSA_MASK != 0 { - NAN - } else if bits & SIGN_MASK != 0 { - NEG_INFINITY - } else { - INFINITY - } - } - - #[inline] - unsafe fn write_to_ryu_buffer(self, result: *mut u8) -> usize { - raw::format32(self, result) - } -} - -impl Sealed for f64 { - #[inline] - fn is_nonfinite(self) -> bool { - const EXP_MASK: u64 = 0x7ff0000000000000; - let bits = self.to_bits(); - bits & EXP_MASK == EXP_MASK - } - - #[cold] - #[cfg_attr(feature = "no-panic", inline)] - fn format_nonfinite(self) -> &'static str { - const MANTISSA_MASK: u64 = 0x000fffffffffffff; - const SIGN_MASK: u64 = 0x8000000000000000; - let bits = self.to_bits(); - if bits & MANTISSA_MASK != 0 { - NAN - } else if bits & SIGN_MASK != 0 { - NEG_INFINITY - } else { - INFINITY - } - } - - #[inline] - unsafe fn write_to_ryu_buffer(self, result: *mut u8) -> usize { - raw::format64(self, result) - } -} |