From 26a029d407be480d791972afb5975cf62c9360a6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Fri, 19 Apr 2024 02:47:55 +0200 Subject: Adding upstream version 124.0.1. Signed-off-by: Daniel Baumann --- third_party/rust/unicode-width/src/lib.rs | 131 ++++++++++++++++++++++++++++++ 1 file changed, 131 insertions(+) create mode 100644 third_party/rust/unicode-width/src/lib.rs (limited to 'third_party/rust/unicode-width/src/lib.rs') diff --git a/third_party/rust/unicode-width/src/lib.rs b/third_party/rust/unicode-width/src/lib.rs new file mode 100644 index 0000000000..1ee35c85d5 --- /dev/null +++ b/third_party/rust/unicode-width/src/lib.rs @@ -0,0 +1,131 @@ +// Copyright 2012-2015 The Rust Project Developers. See the COPYRIGHT +// file at the top-level directory of this distribution and at +// http://rust-lang.org/COPYRIGHT. +// +// Licensed under the Apache License, Version 2.0 or the MIT license +// , at your +// option. This file may not be copied, modified, or distributed +// except according to those terms. + +//! Determine displayed width of `char` and `str` types according to +//! [Unicode Standard Annex #11](http://www.unicode.org/reports/tr11/) +//! rules. +//! +//! ```rust +//! extern crate unicode_width; +//! +//! use unicode_width::UnicodeWidthStr; +//! +//! fn main() { +//! let teststr = "Ｈｅｌｌｏ, ｗｏｒｌｄ!"; +//! let width = UnicodeWidthStr::width(teststr); +//! println!("{}", teststr); +//! println!("The above string is {} columns wide.", width); +//! let width = teststr.width_cjk(); +//! println!("The above string is {} columns wide (CJK).", width); +//! } +//! ``` +//! +//! # features +//! +//! unicode-width supports a `no_std` feature. This eliminates dependence +//! on std, and instead uses equivalent functions from core. +//! +//! # crates.io +//! +//! You can use this package in your project by adding the following +//! to your `Cargo.toml`: +//! +//! ```toml +//! [dependencies] +//! unicode-width = "0.1.5" +//! ``` + +#![deny(missing_docs, unsafe_code)] +#![doc(html_logo_url = "https://unicode-rs.github.io/unicode-rs_sm.png", + html_favicon_url = "https://unicode-rs.github.io/unicode-rs_sm.png")] + +#![cfg_attr(feature = "bench", feature(test))] +#![no_std] + +#[cfg(test)] +#[macro_use] +extern crate std; + +#[cfg(feature = "bench")] +extern crate test; + +use tables::charwidth as cw; +pub use tables::UNICODE_VERSION; + +use core::ops::Add; + +mod tables; + +#[cfg(test)] +mod tests; + +/// Methods for determining displayed width of Unicode characters. +pub trait UnicodeWidthChar { + /// Returns the character's displayed width in columns, or `None` if the + /// character is a control character other than `'\x00'`. + /// + /// This function treats characters in the Ambiguous category according + /// to [Unicode Standard Annex #11](http://www.unicode.org/reports/tr11/) + /// as 1 column wide. This is consistent with the recommendations for non-CJK + /// contexts, or when the context cannot be reliably determined. + fn width(self) -> Option; + + /// Returns the character's displayed width in columns, or `None` if the + /// character is a control character other than `'\x00'`. + /// + /// This function treats characters in the Ambiguous category according + /// to [Unicode Standard Annex #11](http://www.unicode.org/reports/tr11/) + /// as 2 columns wide. This is consistent with the recommendations for + /// CJK contexts. + fn width_cjk(self) -> Option; +} + +impl UnicodeWidthChar for char { + #[inline] + fn width(self) -> Option { cw::width(self, false) } + + #[inline] + fn width_cjk(self) -> Option { cw::width(self, true) } +} + +/// Methods for determining displayed width of Unicode strings. +pub trait UnicodeWidthStr { + /// Returns the string's displayed width in columns. + /// + /// Control characters are treated as having zero width. + /// + /// This function treats characters in the Ambiguous category according + /// to [Unicode Standard Annex #11](http://www.unicode.org/reports/tr11/) + /// as 1 column wide. This is consistent with the recommendations for + /// non-CJK contexts, or when the context cannot be reliably determined. + fn width<'a>(&'a self) -> usize; + + /// Returns the string's displayed width in columns. + /// + /// Control characters are treated as having zero width. + /// + /// This function treats characters in the Ambiguous category according + /// to [Unicode Standard Annex #11](http://www.unicode.org/reports/tr11/) + /// as 2 column wide. This is consistent with the recommendations for + /// CJK contexts. + fn width_cjk<'a>(&'a self) -> usize; +} + +impl UnicodeWidthStr for str { + #[inline] + fn width(&self) -> usize { + self.chars().map(|c| cw::width(c, false).unwrap_or(0)).fold(0, Add::add) + } + + #[inline] + fn width_cjk(&self) -> usize { + self.chars().map(|c| cw::width(c, true).unwrap_or(0)).fold(0, Add::add) + } +} -- cgit v1.2.3