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/utf8_iter/.cargo-checksum.json | 1 + third_party/rust/utf8_iter/COPYRIGHT | 42 ++++ third_party/rust/utf8_iter/Cargo.toml | 34 +++ third_party/rust/utf8_iter/LICENSE-APACHE | 202 ++++++++++++++++++ third_party/rust/utf8_iter/LICENSE-MIT | 25 +++ third_party/rust/utf8_iter/README.md | 46 ++++ third_party/rust/utf8_iter/src/indices.rs | 120 +++++++++++ third_party/rust/utf8_iter/src/lib.rs | 273 ++++++++++++++++++++++++ 8 files changed, 743 insertions(+) create mode 100644 third_party/rust/utf8_iter/.cargo-checksum.json create mode 100644 third_party/rust/utf8_iter/COPYRIGHT create mode 100644 third_party/rust/utf8_iter/Cargo.toml create mode 100644 third_party/rust/utf8_iter/LICENSE-APACHE create mode 100644 third_party/rust/utf8_iter/LICENSE-MIT create mode 100644 third_party/rust/utf8_iter/README.md create mode 100644 third_party/rust/utf8_iter/src/indices.rs create mode 100644 third_party/rust/utf8_iter/src/lib.rs (limited to 'third_party/rust/utf8_iter') diff --git a/third_party/rust/utf8_iter/.cargo-checksum.json b/third_party/rust/utf8_iter/.cargo-checksum.json new file mode 100644 index 0000000000..c82c22f3e7 --- /dev/null +++ b/third_party/rust/utf8_iter/.cargo-checksum.json @@ -0,0 +1 @@ +{"files":{"COPYRIGHT":"c30152c94a6d75e021adbc52b3a52470366a46edb917e17deae3259251af244c","Cargo.toml":"7da67fd58b8f357a045af06383ca245de59e8221a56abc34406fb6ed6e1cc43a","LICENSE-APACHE":"cfc7749b96f63bd31c3c42b5c471bf756814053e847c10f3eb003417bc523d30","LICENSE-MIT":"3fa4ca83dcc9237839b1bdeb2e6d16bdfb5ec0c5ce42b24694d8bbf0dcbef72c","README.md":"6acce7a548969e2ef506f385a81ec6d648fdda145e7a035247a4d438e0372b44","src/indices.rs":"b01fbaac3c9a09be130cac57066a980362a1290fac2fe0f27f6238818235f94c","src/lib.rs":"4a5510ee6c8f7c3fbf55d7a26d799b78e766b2ecc170c1d2e55d093b89b45040"},"package":"64a8922555b9500e3d865caed19330172cd67cbf82203f1a3311d8c305cc9f33"} \ No newline at end of file diff --git a/third_party/rust/utf8_iter/COPYRIGHT b/third_party/rust/utf8_iter/COPYRIGHT new file mode 100644 index 0000000000..b5e9457404 --- /dev/null +++ b/third_party/rust/utf8_iter/COPYRIGHT @@ -0,0 +1,42 @@ +Copyright Mozilla Foundation + +Licensed under the Apache License (Version 2.0), or the MIT license, +(the "Licenses") at your option. You may not use this file except in +compliance with one of the Licenses. You may obtain copies of the +Licenses at: + + https://www.apache.org/licenses/LICENSE-2.0 + https://opensource.org/licenses/MIT + +Unless required by applicable law or agreed to in writing, software +distributed under the Licenses is distributed on an "AS IS" BASIS, +WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +See the Licenses for the specific language governing permissions and +limitations under the Licenses. + +-- + +Test code is dedicated to the Public Domain when so designated (see +the individual files for PD/CC0-dedicated sections). + +-- + +The implementation for Utf8CharIndices was adapted from the +CharIndices implementation of the Rust standard library at revision +ab32548539ec38a939c1b58599249f3b54130026 +(https://github.com/rust-lang/rust/blob/ab32548539ec38a939c1b58599249f3b54130026/library/core/src/str/iter.rs). + +Excerpt from https://github.com/rust-lang/rust/blob/ab32548539ec38a939c1b58599249f3b54130026/COPYRIGHT , +which refers to +https://github.com/rust-lang/rust/blob/ab32548539ec38a939c1b58599249f3b54130026/LICENSE-APACHE +and +https://github.com/rust-lang/rust/blob/ab32548539ec38a939c1b58599249f3b54130026/LICENSE-MIT +: + +For full authorship information, see the version control history or +https://thanks.rust-lang.org + +Except as otherwise noted (below and/or in individual files), Rust is +licensed under the Apache License, Version 2.0 or + or the MIT license + or , at your option. diff --git a/third_party/rust/utf8_iter/Cargo.toml b/third_party/rust/utf8_iter/Cargo.toml new file mode 100644 index 0000000000..6e89caa036 --- /dev/null +++ b/third_party/rust/utf8_iter/Cargo.toml @@ -0,0 +1,34 @@ +# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO +# +# When uploading crates to the registry Cargo will automatically +# "normalize" Cargo.toml files for maximal compatibility +# with all versions of Cargo and also rewrite `path` dependencies +# to registry (e.g., crates.io) dependencies. +# +# If you are reading this file be aware that the original Cargo.toml +# will likely look very different (and much more reasonable). +# See Cargo.toml.orig for the original contents. + +[package] +edition = "2021" +name = "utf8_iter" +version = "1.0.3" +authors = ["Henri Sivonen "] +description = "Iterator by char over potentially-invalid UTF-8 in &[u8]" +homepage = "https://docs.rs/utf8_iter/" +documentation = "https://docs.rs/utf8_iter/" +readme = "README.md" +keywords = [ + "encoding", + "UTF-8", + "unicode", + "iterator", +] +categories = [ + "text-processing", + "encoding", + "internationalization", +] +license = "Apache-2.0 OR MIT" +repository = "https://github.com/hsivonen/utf8_iter" +resolver = "2" diff --git a/third_party/rust/utf8_iter/LICENSE-APACHE b/third_party/rust/utf8_iter/LICENSE-APACHE new file mode 100644 index 0000000000..d645695673 --- /dev/null +++ b/third_party/rust/utf8_iter/LICENSE-APACHE @@ -0,0 +1,202 @@ + + Apache License + Version 2.0, January 2004 + http://www.apache.org/licenses/ + + TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + + 1. 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IN NO EVENT +SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY +CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION +OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR +IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER +DEALINGS IN THE SOFTWARE. diff --git a/third_party/rust/utf8_iter/README.md b/third_party/rust/utf8_iter/README.md new file mode 100644 index 0000000000..c6290861ae --- /dev/null +++ b/third_party/rust/utf8_iter/README.md @@ -0,0 +1,46 @@ +# utf8_iter + +[![crates.io](https://img.shields.io/crates/v/utf8_iter.svg)](https://crates.io/crates/utf8_iter) +[![docs.rs](https://docs.rs/utf8_iter/badge.svg)](https://docs.rs/utf8_iter/) + +utf8_iter provides iteration by `char` over potentially-invalid UTF-8 `&[u8]` +such that UTF-8 errors are handled according to the WHATWG Encoding Standard. + +Key parts of the code are copypaste from the UTF-8 to UTF-16 conversion code +in `encoding_rs`, which was optimized for speed in the case of valid input. +The implementation here uses the structure that was found to be fast in the +`encoding_rs` context but the structure hasn't been benchmarked in this +context. + +This is a `no_std` crate. + +## Licensing + +TL;DR: `Apache-2.0 OR MIT` + +Please see the file named +[COPYRIGHT](https://github.com/hsivonen/utf8_iter/blob/master/COPYRIGHT). + +## Documentation + +Generated [API documentation](https://docs.rs/utf8_iter/) is available +online. + +## Release Notes + +### 1.0.3 + +* Fix an error in documentation. + +### 1.0.2 + +* `char_indices()` implementation. + +### 1.0.1 + +* `as_slice()` method. +* Implement `DoubleEndedIterator` + +### 1.0.0 + +The initial release. diff --git a/third_party/rust/utf8_iter/src/indices.rs b/third_party/rust/utf8_iter/src/indices.rs new file mode 100644 index 0000000000..1646f8b8dc --- /dev/null +++ b/third_party/rust/utf8_iter/src/indices.rs @@ -0,0 +1,120 @@ +// The code in this file was adapted from the CharIndices implementation of +// the Rust standard library at revision ab32548539ec38a939c1b58599249f3b54130026 +// (https://github.com/rust-lang/rust/blob/ab32548539ec38a939c1b58599249f3b54130026/library/core/src/str/iter.rs). +// +// Excerpt from https://github.com/rust-lang/rust/blob/ab32548539ec38a939c1b58599249f3b54130026/COPYRIGHT , +// which refers to +// https://github.com/rust-lang/rust/blob/ab32548539ec38a939c1b58599249f3b54130026/LICENSE-APACHE +// and +// https://github.com/rust-lang/rust/blob/ab32548539ec38a939c1b58599249f3b54130026/LICENSE-MIT +// : +// +// For full authorship information, see the version control history or +// https://thanks.rust-lang.org +// +// Except as otherwise noted (below and/or in individual files), Rust is +// licensed under the Apache License, Version 2.0 or +// or the MIT license +// or , at your option. + +use super::Utf8Chars; +use core::iter::FusedIterator; + +/// An iterator over the [`char`]s and their positions. +#[derive(Clone, Debug)] +#[must_use = "iterators are lazy and do nothing unless consumed"] +pub struct Utf8CharIndices<'a> { + front_offset: usize, + iter: Utf8Chars<'a>, +} + +impl<'a> Iterator for Utf8CharIndices<'a> { + type Item = (usize, char); + + #[inline] + fn next(&mut self) -> Option<(usize, char)> { + let pre_len = self.as_slice().len(); + match self.iter.next() { + None => None, + Some(ch) => { + let index = self.front_offset; + let len = self.as_slice().len(); + self.front_offset += pre_len - len; + Some((index, ch)) + } + } + } + + #[inline] + fn count(self) -> usize { + self.iter.count() + } + + #[inline] + fn size_hint(&self) -> (usize, Option) { + self.iter.size_hint() + } + + #[inline] + fn last(mut self) -> Option<(usize, char)> { + // No need to go through the entire string. + self.next_back() + } +} + +impl<'a> DoubleEndedIterator for Utf8CharIndices<'a> { + #[inline] + fn next_back(&mut self) -> Option<(usize, char)> { + self.iter.next_back().map(|ch| { + let index = self.front_offset + self.as_slice().len(); + (index, ch) + }) + } +} + +impl FusedIterator for Utf8CharIndices<'_> {} + +impl<'a> Utf8CharIndices<'a> { + #[inline(always)] + /// Creates the iterator from a byte slice. + pub fn new(bytes: &'a [u8]) -> Self { + Utf8CharIndices::<'a> { + front_offset: 0, + iter: Utf8Chars::new(bytes), + } + } + + /// Views the underlying data as a subslice of the original data. + /// + /// This has the same lifetime as the original slice, and so the + /// iterator can continue to be used while this exists. + #[must_use] + #[inline] + pub fn as_slice(&self) -> &'a [u8] { + self.iter.as_slice() + } + + /// Returns the byte position of the next character, or the length + /// of the underlying string if there are no more characters. + /// + /// # Examples + /// + /// ``` + /// use utf8_iter::Utf8CharsEx; + /// let mut chars = "a楽".as_bytes().char_indices(); + /// + /// assert_eq!(chars.offset(), 0); + /// assert_eq!(chars.next(), Some((0, 'a'))); + /// + /// assert_eq!(chars.offset(), 1); + /// assert_eq!(chars.next(), Some((1, '楽'))); + /// + /// assert_eq!(chars.offset(), 4); + /// assert_eq!(chars.next(), None); + /// ``` + #[inline] + #[must_use] + pub fn offset(&self) -> usize { + self.front_offset + } +} diff --git a/third_party/rust/utf8_iter/src/lib.rs b/third_party/rust/utf8_iter/src/lib.rs new file mode 100644 index 0000000000..bea1ce029b --- /dev/null +++ b/third_party/rust/utf8_iter/src/lib.rs @@ -0,0 +1,273 @@ +// Copyright Mozilla Foundation +// +// Licensed under the Apache License (Version 2.0), or the MIT license, +// (the "Licenses") at your option. You may not use this file except in +// compliance with one of the Licenses. You may obtain copies of the +// Licenses at: +// +// https://www.apache.org/licenses/LICENSE-2.0 +// https://opensource.org/licenses/MIT +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the Licenses is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the Licenses for the specific language governing permissions and +// limitations under the Licenses. + +#![no_std] + +//! Provides iteration by `char` over `&[u8]` containing potentially-invalid +//! UTF-8 such that errors are handled according to the [WHATWG Encoding +//! Standard](https://encoding.spec.whatwg.org/#utf-8-decoder) (i.e. the same +//! way as in `String::from_utf8_lossy`). +//! +//! The trait `Utf8CharsEx` provides the convenience method `chars()` on +//! byte slices themselves instead of having to use the more verbose +//! `Utf8Chars::new(slice)`. +//! +//! ```rust +//! use utf8_iter::Utf8CharsEx; +//! let data = b"\xFF\xC2\xE2\xE2\x98\xF0\xF0\x9F\xF0\x9F\x92\xE2\x98\x83"; +//! let from_iter: String = data.chars().collect(); +//! let from_std = String::from_utf8_lossy(data); +//! assert_eq!(from_iter, from_std); +//! ``` + +mod indices; + +pub use crate::indices::Utf8CharIndices; +use core::iter::FusedIterator; + +#[repr(align(64))] // Align to cache lines +struct Utf8Data { + pub table: [u8; 384], +} + +// This is generated code copied and pasted from utf_8.rs of encoding_rs. +// Please don't edit by hand but instead regenerate as instructed in that +// file. + +static UTF8_DATA: Utf8Data = Utf8Data { + table: [ + 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, + 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, + 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, + 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, + 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, + 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, + 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, + 252, 252, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 148, 148, 148, + 148, 148, 148, 148, 148, 148, 148, 148, 148, 148, 148, 148, 148, 164, 164, 164, 164, 164, + 164, 164, 164, 164, 164, 164, 164, 164, 164, 164, 164, 164, 164, 164, 164, 164, 164, 164, + 164, 164, 164, 164, 164, 164, 164, 164, 164, 252, 252, 252, 252, 252, 252, 252, 252, 252, + 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, + 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, + 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, + 252, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, + 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, + 4, 4, 4, 4, 4, 4, 4, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, + 8, 8, 8, 8, 8, 8, 8, 16, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 32, 8, 8, 64, 8, 8, 8, 128, 4, + 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, + ], +}; + +// End manually copypasted generated code. + +#[inline(always)] +fn in_inclusive_range8(i: u8, start: u8, end: u8) -> bool { + i.wrapping_sub(start) <= (end - start) +} + +/// Iterator by `char` over `&[u8]` that contains +/// potentially-invalid UTF-8. See the crate documentation. +#[derive(Debug, Clone)] +pub struct Utf8Chars<'a> { + remaining: &'a [u8], +} + +impl<'a> Utf8Chars<'a> { + #[inline(always)] + /// Creates the iterator from a byte slice. + pub fn new(bytes: &'a [u8]) -> Self { + Utf8Chars::<'a> { remaining: bytes } + } + + /// Views the current remaining data in the iterator as a subslice + /// of the original slice. + #[inline(always)] + pub fn as_slice(&self) -> &'a [u8] { + self.remaining + } + + #[inline(never)] + fn next_fallback(&mut self) -> Option { + if self.remaining.is_empty() { + return None; + } + let first = self.remaining[0]; + if first < 0x80 { + self.remaining = &self.remaining[1..]; + return Some(char::from(first)); + } + if !in_inclusive_range8(first, 0xC2, 0xF4) || self.remaining.len() == 1 { + self.remaining = &self.remaining[1..]; + return Some('\u{FFFD}'); + } + let second = self.remaining[1]; + let (lower_bound, upper_bound) = match first { + 0xE0 => (0xA0, 0xBF), + 0xED => (0x80, 0x9F), + 0xF0 => (0x90, 0xBF), + 0xF4 => (0x80, 0x8F), + _ => (0x80, 0xBF), + }; + if !in_inclusive_range8(second, lower_bound, upper_bound) { + self.remaining = &self.remaining[1..]; + return Some('\u{FFFD}'); + } + if first < 0xE0 { + self.remaining = &self.remaining[2..]; + let point = ((u32::from(first) & 0x1F) << 6) | (u32::from(second) & 0x3F); + return Some(unsafe { char::from_u32_unchecked(point) }); + } + if self.remaining.len() == 2 { + self.remaining = &self.remaining[2..]; + return Some('\u{FFFD}'); + } + let third = self.remaining[2]; + if !in_inclusive_range8(third, 0x80, 0xBF) { + self.remaining = &self.remaining[2..]; + return Some('\u{FFFD}'); + } + if first < 0xF0 { + self.remaining = &self.remaining[3..]; + let point = ((u32::from(first) & 0xF) << 12) + | ((u32::from(second) & 0x3F) << 6) + | (u32::from(third) & 0x3F); + return Some(unsafe { char::from_u32_unchecked(point) }); + } + // At this point, we have a valid 3-byte prefix of a + // four-byte sequence that has to be incomplete, because + // otherwise `next()` would have succeeded. + self.remaining = &self.remaining[3..]; + Some('\u{FFFD}') + } +} + +impl<'a> Iterator for Utf8Chars<'a> { + type Item = char; + + #[inline] + fn next(&mut self) -> Option { + // This loop is only broken out of as goto forward + #[allow(clippy::never_loop)] + loop { + if self.remaining.len() < 4 { + break; + } + let first = self.remaining[0]; + if first < 0x80 { + self.remaining = &self.remaining[1..]; + return Some(char::from(first)); + } + let second = self.remaining[1]; + if in_inclusive_range8(first, 0xC2, 0xDF) { + if !in_inclusive_range8(second, 0x80, 0xBF) { + break; + } + let point = ((u32::from(first) & 0x1F) << 6) | (u32::from(second) & 0x3F); + self.remaining = &self.remaining[2..]; + return Some(unsafe { char::from_u32_unchecked(point) }); + } + // This table-based formulation was benchmark-based in encoding_rs, + // but it hasn't been re-benchmarked in this iterator context. + let third = self.remaining[2]; + if first < 0xF0 { + if ((UTF8_DATA.table[usize::from(second)] + & UTF8_DATA.table[usize::from(first) + 0x80]) + | (third >> 6)) + != 2 + { + break; + } + let point = ((u32::from(first) & 0xF) << 12) + | ((u32::from(second) & 0x3F) << 6) + | (u32::from(third) & 0x3F); + self.remaining = &self.remaining[3..]; + return Some(unsafe { char::from_u32_unchecked(point) }); + } + let fourth = self.remaining[3]; + if (u16::from( + UTF8_DATA.table[usize::from(second)] & UTF8_DATA.table[usize::from(first) + 0x80], + ) | u16::from(third >> 6) + | (u16::from(fourth & 0xC0) << 2)) + != 0x202 + { + break; + } + let point = ((u32::from(first) & 0x7) << 18) + | ((u32::from(second) & 0x3F) << 12) + | ((u32::from(third) & 0x3F) << 6) + | (u32::from(fourth) & 0x3F); + self.remaining = &self.remaining[4..]; + return Some(unsafe { char::from_u32_unchecked(point) }); + } + self.next_fallback() + } +} + +impl<'a> DoubleEndedIterator for Utf8Chars<'a> { + #[inline] + fn next_back(&mut self) -> Option { + if self.remaining.is_empty() { + return None; + } + let mut attempt = 1; + for b in self.remaining.iter().rev() { + if b & 0xC0 != 0x80 { + let (head, tail) = self.remaining.split_at(self.remaining.len() - attempt); + let mut inner = Utf8Chars::new(tail); + let candidate = inner.next(); + if inner.as_slice().is_empty() { + self.remaining = head; + return candidate; + } + break; + } + if attempt == 4 { + break; + } + attempt += 1; + } + + self.remaining = &self.remaining[..self.remaining.len() - 1]; + Some('\u{FFFD}') + } +} + +impl FusedIterator for Utf8Chars<'_> {} + +/// Convenience trait that adds `chars()` and `char_indices()` methods +/// similar to the ones on string slices to byte slices. +pub trait Utf8CharsEx { + fn chars(&self) -> Utf8Chars<'_>; + fn char_indices(&self) -> Utf8CharIndices<'_>; +} + +impl Utf8CharsEx for [u8] { + /// Convenience method for creating an UTF-8 iterator + /// for the slice. + #[inline] + fn chars(&self) -> Utf8Chars<'_> { + Utf8Chars::new(self) + } + /// Convenience method for creating a byte index and + /// UTF-8 iterator for the slice. + #[inline] + fn char_indices(&self) -> Utf8CharIndices<'_> { + Utf8CharIndices::new(self) + } +} + +// No manually-written tests for forward-iteration, because the code passed multiple +// days of fuzzing comparing with known-good behavior. -- cgit v1.2.3