Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 123 insertions, 0 deletions

diff --git a/third_party/rust/ryu/src/lib.rs b/third_party/rust/ryu/src/lib.rs
new file mode 100644
index 0000000000..59e0dcd0cb
--- /dev/null
+++ b/third_party/rust/ryu/src/lib.rs
@@ -0,0 +1,123 @@
+//! [![github]](https://github.com/dtolnay/ryu) [![crates-io]](https://crates.io/crates/ryu) [![docs-rs]](https://docs.rs/ryu)
+//!
+//! [github]: https://img.shields.io/badge/github-8da0cb?style=for-the-badge&labelColor=555555&logo=github
+//! [crates-io]: https://img.shields.io/badge/crates.io-fc8d62?style=for-the-badge&labelColor=555555&logo=rust
+//! [docs-rs]: https://img.shields.io/badge/docs.rs-66c2a5?style=for-the-badge&labelColor=555555&logo=docs.rs
+//!
+//! <br>
+//!
+//! Pure Rust implementation of Ryū, an algorithm to quickly convert floating
+//! point numbers to decimal strings.
+//!
+//! The PLDI'18 paper [*Ryū: fast float-to-string conversion*][paper] by Ulf
+//! Adams includes a complete correctness proof of the algorithm. The paper is
+//! available under the creative commons CC-BY-SA license.
+//!
+//! This Rust implementation is a line-by-line port of Ulf Adams' implementation
+//! in C, [https://github.com/ulfjack/ryu][upstream].
+//!
+//! [paper]: https://dl.acm.org/citation.cfm?id=3192369
+//! [upstream]: https://github.com/ulfjack/ryu
+//!
+//! # Example
+//!
+//! ```
+//! fn main() {
+//!     let mut buffer = ryu::Buffer::new();
+//!     let printed = buffer.format(1.234);
+//!     assert_eq!(printed, "1.234");
+//! }
+//! ```
+//!
+//! ## Performance (lower is better)
+//!
+//! ![performance](https://raw.githubusercontent.com/dtolnay/ryu/master/performance.png)
+//!
+//! You can run upstream's benchmarks with:
+//!
+//! ```console
+//! $ git clone https://github.com/ulfjack/ryu c-ryu
+//! $ cd c-ryu
+//! $ bazel run -c opt //ryu/benchmark
+//! ```
+//!
+//! And the same benchmark against our implementation with:
+//!
+//! ```console
+//! $ git clone https://github.com/dtolnay/ryu rust-ryu
+//! $ cd rust-ryu
+//! $ cargo run --example upstream_benchmark --release
+//! ```
+//!
+//! These benchmarks measure the average time to print a 32-bit float and average
+//! time to print a 64-bit float, where the inputs are distributed as uniform random
+//! bit patterns 32 and 64 bits wide.
+//!
+//! The upstream C code, the unsafe direct Rust port, and the safe pretty Rust API
+//! all perform the same, taking around 21 nanoseconds to format a 32-bit float and
+//! 31 nanoseconds to format a 64-bit float.
+//!
+//! There is also a Rust-specific benchmark comparing this implementation to the
+//! standard library which you can run with:
+//!
+//! ```console
+//! $ cargo bench
+//! ```
+//!
+//! The benchmark shows Ryū approximately 2-5x faster than the standard library
+//! across a range of f32 and f64 inputs. Measurements are in nanoseconds per
+//! iteration; smaller is better.
+//!
+//! ## Formatting
+//!
+//! This library tends to produce more human-readable output than the standard
+//! library's to\_string, which never uses scientific notation. Here are two
+//! examples:
+//!
+//! - *ryu:* 1.23e40, *std:* 12300000000000000000000000000000000000000
+//! - *ryu:* 1.23e-40, *std:* 0.000000000000000000000000000000000000000123
+//!
+//! Both libraries print short decimals such as 0.0000123 without scientific
+//! notation.
+
+#![no_std]
+#![doc(html_root_url = "https://docs.rs/ryu/1.0.12")]
+#![allow(
+    clippy::cast_lossless,
+    clippy::cast_possible_truncation,
+    clippy::cast_possible_wrap,
+    clippy::cast_sign_loss,
+    clippy::checked_conversions,
+    clippy::doc_markdown,
+    clippy::expl_impl_clone_on_copy,
+    clippy::if_not_else,
+    clippy::many_single_char_names,
+    clippy::missing_panics_doc,
+    clippy::module_name_repetitions,
+    clippy::must_use_candidate,
+    clippy::similar_names,
+    clippy::too_many_lines,
+    clippy::unreadable_literal,
+    clippy::unseparated_literal_suffix,
+    clippy::wildcard_imports
+)]
+
+mod buffer;
+mod common;
+mod d2s;
+#[cfg(not(feature = "small"))]
+mod d2s_full_table;
+mod d2s_intrinsics;
+#[cfg(feature = "small")]
+mod d2s_small_table;
+mod digit_table;
+mod f2s;
+mod f2s_intrinsics;
+mod pretty;
+
+pub use crate::buffer::{Buffer, Float};
+
+/// Unsafe functions that mirror the API of the C implementation of Ryū.
+pub mod raw {
+    pub use crate::pretty::{format32, format64};
+}