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"70ec6ce85bb158151cae5e5c87f95a8e97d2c0c4b001223f33a334e3ce5de178" dependencies = [ "winapi", ] [[package]] name = "winapi-x86_64-pc-windows-gnu" version = "0.4.0" source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f" kstring-2.0.0/Cargo.toml0000644000000044270000000000100105210ustar # 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 = "2018" name = "kstring" version = "2.0.0" authors = ["Ed Page "] include = ["build.rs", "src/**/*", "Cargo.toml", "LICENSE*", "README.md", "benches/**/*", "examples/**/*"] description = "Key String: optimized for map keys" documentation = "https://docs.rs/kstring" readme = "README.md" keywords = ["serde", "serialization", "string"] categories = ["data-structures", "text-processing"] license = "MIT OR Apache-2.0" repository = "https://github.com/cobalt-org/kstring" [package.metadata.docs.rs] all-features = true [[package.metadata.release.pre-release-replacements]] file = "CHANGELOG.md" min = 1 replace = "{{version}}" search = "Unreleased" [[package.metadata.release.pre-release-replacements]] exactly = 1 file = "CHANGELOG.md" replace = "...{{tag_name}}" search = "\\.\\.\\.HEAD" [[package.metadata.release.pre-release-replacements]] file = "CHANGELOG.md" min = 1 replace = "{{date}}" search = "ReleaseDate" [[package.metadata.release.pre-release-replacements]] exactly = 1 file = "CHANGELOG.md" replace = "\n## [Unreleased] - ReleaseDate\n" search = "" [[package.metadata.release.pre-release-replacements]] exactly = 1 file = "CHANGELOG.md" replace = "\n[Unreleased]: https://github.com/cobalt-org/kstring/compare/{{tag_name}}...HEAD" search = "" [profile.release] debug = 1 [[bench]] name = "clone" harness = false [[bench]] name = "access" harness = false [dependencies.document-features] version = "0.2" optional = true [dependencies.serde] version = "1.0" optional = true [dependencies.static_assertions] version = "1.1.0" [dev-dependencies.criterion] version = "0.3" [dev-dependencies.proptest] version = "1.0.0" [features] arc = [] default = ["std", "unsafe"] max_inline = [] std = [] unsafe = [] unstable_bench_subset = [] kstring-2.0.0/Cargo.toml.orig000064400000000000000000000033360072674642500142300ustar 00000000000000[package] name = "kstring" version = "2.0.0" description = "Key String: optimized for map keys" authors = ["Ed Page "] license = "MIT OR Apache-2.0" repository = "https://github.com/cobalt-org/kstring" documentation = "https://docs.rs/kstring" readme = "README.md" categories = ["data-structures", "text-processing"] keywords = ["serde", "serialization", "string"] edition = "2018" include = [ "build.rs", "src/**/*", "Cargo.toml", "LICENSE*", "README.md", "benches/**/*", "examples/**/*" ] [package.metadata.docs.rs] all-features = true [package.metadata.release] pre-release-replacements = [ {file="CHANGELOG.md", search="Unreleased", replace="{{version}}", min=1}, {file="CHANGELOG.md", search="\\.\\.\\.HEAD", replace="...{{tag_name}}", exactly=1}, {file="CHANGELOG.md", search="ReleaseDate", replace="{{date}}", min=1}, {file="CHANGELOG.md", search="", replace="\n## [Unreleased] - ReleaseDate\n", exactly=1}, {file="CHANGELOG.md", search="", replace="\n[Unreleased]: https://github.com/cobalt-org/kstring/compare/{{tag_name}}...HEAD", exactly=1}, ] [features] default = ["std", "unsafe"] ## Allow use of `std` std = [] ## O(1) clone support arc = [] ## Inline (stack) strings use the full width of `KString`s max_inline = [] ## Allow unsafe code unsafe = [] unstable_bench_subset = [] [dependencies] static_assertions = "1.1.0" ## `serde` compatibility serde = { version = "1.0", optional = true } document-features = { version = "0.2", optional = true } [dev-dependencies] criterion = "0.3" proptest = "1.0.0" [[bench]] name = "clone" harness = false [[bench]] name = "access" harness = false [profile.release] debug = 1 kstring-2.0.0/LICENSE-APACHE000064400000000000000000000251370072674642500132700ustar 00000000000000 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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See the License for the specific language governing permissions and limitations under the License. kstring-2.0.0/LICENSE-MIT000064400000000000000000000021270072674642500127720ustar 00000000000000The MIT License (MIT) Copyright (c) 2014-2016 Ning Sun and tojson_macros contributors Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 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. kstring-2.0.0/README.md000064400000000000000000000037700072674642500126220ustar 00000000000000KString =========== > Key String: Optimized for map keys. [![Crates Status](https://img.shields.io/crates/v/kstring.svg)](https://crates.io/crates/kstring) ## Background Considerations: - Large maps - Most keys live and drop without being used in any other way - Most keys are relatively small (single to double digit bytes) - Keys are immutable - Allow zero-cost abstractions between structs and maps (e.g. no allocating when dealing with struct field names) Ramifications: - Inline small strings rather than going to the heap. - Preserve `&'static str` across strings (`KString`), references (`KStringRef`), and lifetime abstractions (`KStringCow`) to avoid allocating for struct field names. - Use `Box` rather than `String` to use less memory. Features - `max_inline`: Instead of aligning the inline-string for performance (15 bytes + length on 64-bit), use the full width (22 bytes on 64-bit) - `arc`: Instead of using `Box`, use `Arc`. Note: allocations are fast enough that this can actually slow things down for small enough strings. Alternatives - [`smol_str`](https://crates.io/crates/smol_str) - Size of String - Always uses `Arc` instead of `Box` - Always inlines 22 bytes - Whitespace-only optimizations - [`smartstring`](https://crates.io/crates/smartstring) - Size of String - Allows mutability at the cost of relying on implementation details of `String` - Always inlines 23 bytes - [`compact_str`](https://crates.io/crates/compact_str) - Size of String - Always uses `Arc` instead of `Box` - Inlines 22-23 bytes, depending on implementation ## License Licensed under either of * Apache License, Version 2.0, (http://www.apache.org/licenses/LICENSE-2.0) * MIT license (http://opensource.org/licenses/MIT) at your option. ### Contribution Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions. kstring-2.0.0/benches/access.rs000064400000000000000000000110200072674642500145440ustar 00000000000000#![allow( clippy::clone_on_copy, clippy::useless_conversion, clippy::clone_double_ref )] use criterion::{criterion_group, criterion_main, BenchmarkId, Criterion, Throughput}; type StringCow<'s> = std::borrow::Cow<'s, str>; #[cfg(not(feature = "unstable_bench_subset"))] pub static FIXTURES: &[&str] = &[ "", "0", "01", "012", "0123", "01234", "012345", "0123456", "01234567", "012345678", "0123456789", "01234567890123456789", "0123456789012345678901234567890123456789", "01234567890123456789012345678901234567890123456789012345678901234567890123456789", ]; #[cfg(feature = "unstable_bench_subset")] pub static FIXTURES: &[&str] = &[ "0123456789", "01234567890123456789012345678901234567890123456789012345678901234567890123456789", ]; // Note: this is meant to measure the overhead for accessing the underlying str. We shouldn't try // to optimize *just* the case being measured here. fn bench_access(c: &mut Criterion) { let mut group = c.benchmark_group("access"); for fixture in FIXTURES { let len = fixture.len(); group.throughput(Throughput::Bytes(len as u64)); group.bench_with_input( BenchmarkId::new("StringCow::Borrowed", len), &len, |b, _| { let uut = StringCow::Borrowed(*fixture); let uut = criterion::black_box(uut); b.iter(|| uut.is_empty()) }, ); group.bench_with_input(BenchmarkId::new("StringCow::Owned", len), &len, |b, _| { let uut = StringCow::Owned(String::from(*fixture)); let uut = criterion::black_box(uut); b.iter(|| uut.is_empty()) }); group.bench_with_input( BenchmarkId::new("KString::from_static", len), &len, |b, _| { let uut = kstring::KString::from_static(*fixture); let uut = criterion::black_box(uut); b.iter(|| uut.is_empty()) }, ); group.bench_with_input(BenchmarkId::new("KString::from_ref", len), &len, |b, _| { let uut = kstring::KString::from_ref(*fixture); let uut = criterion::black_box(uut); b.iter(|| uut.is_empty()) }); group.bench_with_input( BenchmarkId::new("KString::from_string", len), &len, |b, _| { let uut = kstring::KString::from_string(String::from(*fixture)); let uut = criterion::black_box(uut); b.iter(|| uut.is_empty()) }, ); #[cfg(not(feature = "unstable_bench_subset"))] group.bench_with_input( BenchmarkId::new("KStringCow::from_static", len), &len, |b, _| { let uut = kstring::KStringCow::from_static(*fixture); let uut = criterion::black_box(uut); b.iter(|| uut.is_empty()) }, ); #[cfg(not(feature = "unstable_bench_subset"))] group.bench_with_input( BenchmarkId::new("KStringCow::from_ref", len), &len, |b, _| { let uut = kstring::KStringCow::from_ref(*fixture); let uut = criterion::black_box(uut); b.iter(|| uut.is_empty()) }, ); #[cfg(not(feature = "unstable_bench_subset"))] group.bench_with_input( BenchmarkId::new("KStringCow::from_string", len), &len, |b, _| { let uut = kstring::KStringCow::from_string(String::from(*fixture)); let uut = criterion::black_box(uut); b.iter(|| uut.is_empty()) }, ); #[cfg(not(feature = "unstable_bench_subset"))] group.bench_with_input( BenchmarkId::new("KStringRef::from_static", len), &len, |b, _| { let uut = kstring::KStringRef::from_static(*fixture); let uut = criterion::black_box(uut); b.iter(|| uut.is_empty()) }, ); #[cfg(not(feature = "unstable_bench_subset"))] group.bench_with_input( BenchmarkId::new("KStringRef::from_ref", len), &len, |b, _| { let uut = kstring::KStringRef::from_ref(*fixture); let uut = criterion::black_box(uut); b.iter(|| uut.is_empty()) }, ); } group.finish(); } criterion_group!(benches, bench_access); criterion_main!(benches); kstring-2.0.0/benches/clone.rs000064400000000000000000000123210072674642500144100ustar 00000000000000#![allow( clippy::clone_on_copy, clippy::useless_conversion, clippy::clone_double_ref )] use criterion::{criterion_group, criterion_main, BenchmarkId, Criterion, Throughput}; type StringCow<'s> = std::borrow::Cow<'s, str>; #[cfg(not(feature = "unstable_bench_subset"))] pub static FIXTURES: &[&str] = &[ // Empty handling "", // Barely used "1", // kstring's max small-string size "123456789012345", // Boundary conditions for most small-string optimizations "1234567890123456789012", "12345678901234567890123", "123456789012345678901234", "1234567890123456789012345", // Small heap "1234567890123456789012345678901234567890123456789012345678901234", // Large heap "12345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890", ]; #[cfg(feature = "unstable_bench_subset")] pub static FIXTURES: &[&str] = &[ "0123456789", "01234567890123456789012345678901234567890123456789012345678901234567890123456789", ]; fn bench_clone(c: &mut Criterion) { let mut group = c.benchmark_group("clone"); for fixture in FIXTURES { let len = fixture.len(); group.throughput(Throughput::Bytes(len as u64)); group.bench_with_input( BenchmarkId::new("StringCow::Borrowed", len), &len, |b, _| { let uut = StringCow::Borrowed(*fixture); let uut = criterion::black_box(uut); b.iter(|| uut.clone()) }, ); group.bench_with_input(BenchmarkId::new("StringCow::Owned", len), &len, |b, _| { let fixture = String::from(*fixture); let uut = StringCow::Owned(fixture); let uut = criterion::black_box(uut); b.iter(|| uut.clone()) }); group.bench_with_input( BenchmarkId::new("KString::from_static", len), &len, |b, _| { let uut = kstring::KString::from_static(*fixture); let uut = criterion::black_box(uut); b.iter(|| uut.clone()) }, ); group.bench_with_input(BenchmarkId::new("KString::from_ref", len), &len, |b, _| { let fixture = String::from(*fixture); let uut = kstring::KString::from_ref(&fixture); let uut = criterion::black_box(uut); b.iter(|| uut.clone()) }); group.bench_with_input( BenchmarkId::new("KString::from_string", len), &len, |b, _| { let fixture = String::from(*fixture); let uut = kstring::KString::from_string(fixture); let uut = criterion::black_box(uut); b.iter(|| uut.clone()) }, ); #[cfg(not(feature = "unstable_bench_subset"))] group.bench_with_input( BenchmarkId::new("KStringCow::from_static", len), &len, |b, _| { let uut = kstring::KStringCow::from_static(*fixture); let uut = criterion::black_box(uut); b.iter(|| uut.clone()) }, ); #[cfg(not(feature = "unstable_bench_subset"))] group.bench_with_input( BenchmarkId::new("KStringCow::from_ref", len), &len, |b, _| { let fixture = String::from(*fixture); let uut = kstring::KStringCow::from_ref(&fixture); let uut = criterion::black_box(uut); b.iter(|| uut.clone()) }, ); #[cfg(not(feature = "unstable_bench_subset"))] group.bench_with_input( BenchmarkId::new("KStringCow::from_string", len), &len, |b, _| { let fixture = String::from(*fixture); let uut = kstring::KStringCow::from_string(fixture); let uut = criterion::black_box(uut); b.iter(|| uut.clone()) }, ); #[cfg(not(feature = "unstable_bench_subset"))] group.bench_with_input( BenchmarkId::new("KStringRef::from_static", len), &len, |b, _| { let uut = kstring::KStringRef::from_static(*fixture); let uut = criterion::black_box(uut); b.iter(|| uut.clone()) }, ); #[cfg(not(feature = "unstable_bench_subset"))] group.bench_with_input( BenchmarkId::new("KStringRef::from_ref", len), &len, |b, _| { let fixture = String::from(*fixture); let uut = kstring::KStringRef::from_ref(&fixture); let uut = criterion::black_box(uut); b.iter(|| uut.clone()) }, ); } group.finish(); } criterion_group!(benches, bench_clone); criterion_main!(benches); kstring-2.0.0/examples/bench.rs000064400000000000000000000013450072674642500146020ustar 00000000000000fn main() { let mut args = std::env::args(); let _ = args.next(); let method = args.next().unwrap_or_else(|| String::from("from_ref")); let sample = args.next().unwrap_or_else(|| String::from("0123456789")); let count = args .next() .unwrap_or_else(|| String::from("10000000")) .parse::() .unwrap(); #[allow(clippy::redundant_closure)] // Needed for consistent type let method = match method.as_str() { "from_ref" => |s| kstring::KString::from_ref(s), "from_string" => |s| kstring::KString::from_string(String::from(s)), _ => panic!("{:?} unsupported, try `from_ref`, `from_string`", method), }; (0..count).map(|_| method(&sample)).last(); } kstring-2.0.0/src/backend.rs000064400000000000000000000040100072674642500140530ustar 00000000000000#[cfg(feature = "arc")] pub(crate) type DefaultStr = crate::backend::ArcStr; #[cfg(not(feature = "arc"))] pub(crate) type DefaultStr = crate::backend::BoxedStr; /// Fast allocations, O(n) clones pub type BoxedStr = Box; static_assertions::assert_eq_size!(DefaultStr, BoxedStr); /// Cross-thread, O(1) clones pub type ArcStr = std::sync::Arc; static_assertions::assert_eq_size!(DefaultStr, ArcStr); /// O(1) clones pub type RcStr = std::rc::Rc; static_assertions::assert_eq_size!(DefaultStr, RcStr); /// Abstract over different type of heap-allocated strings pub trait HeapStr: std::fmt::Debug + Clone + private::Sealed { fn from_str(other: &str) -> Self; fn from_string(other: String) -> Self; fn from_boxed_str(other: BoxedStr) -> Self; fn as_str(&self) -> &str; } impl HeapStr for BoxedStr { #[inline] fn from_str(other: &str) -> Self { other.into() } #[inline] fn from_string(other: String) -> Self { other.into_boxed_str() } #[inline] fn from_boxed_str(other: BoxedStr) -> Self { other } #[inline] fn as_str(&self) -> &str { self } } impl HeapStr for ArcStr { #[inline] fn from_str(other: &str) -> Self { other.into() } #[inline] fn from_string(other: String) -> Self { other.into_boxed_str().into() } #[inline] fn from_boxed_str(other: BoxedStr) -> Self { other.into() } #[inline] fn as_str(&self) -> &str { self } } impl HeapStr for RcStr { #[inline] fn from_str(other: &str) -> Self { other.into() } #[inline] fn from_string(other: String) -> Self { other.into_boxed_str().into() } #[inline] fn from_boxed_str(other: BoxedStr) -> Self { other.into() } #[inline] fn as_str(&self) -> &str { self } } pub(crate) mod private { pub trait Sealed {} impl Sealed for super::BoxedStr {} impl Sealed for super::ArcStr {} impl Sealed for super::RcStr {} } kstring-2.0.0/src/lib.rs000064400000000000000000000042610072674642500132420ustar 00000000000000//! Key String: Optimized for map keys. //! //! # Examples //! //! String creation //! ```rust //! // Explicit //! let literal = kstring::KString::from_static("literal"); //! // Implicit //! let literal = kstring::KString::from("literal"); //! //! // Explicit //! let inline = kstring::KString::try_inline("stack").unwrap(); //! let inline = kstring::KString::from_ref("stack"); //! //! let formatted: kstring::KStringCow = format!("Hello {} and {}", literal, inline).into(); //! ``` //! //! # Background //! //! Considerations: //! - Large maps //! - Most keys live and drop without being used in any other way //! - Most keys are relatively small (single to double digit bytes) //! - Keys are immutable //! - Allow zero-cost abstractions between structs and maps (e.g. no allocating //! when dealing with struct field names) //! //! Ramifications: //! - Inline small strings rather than going to the heap. //! - Preserve `&'static str` across strings ([`KString`]), //! references ([`KStringRef`]), and lifetime abstractions ([`KStringCow`]) to avoid //! allocating for struct field names. //! - Use `Box` rather than `String` to use less memory. //! //! # Feature Flags //! #![cfg_attr(feature = "document-features", doc = document_features::document_features!())] #![cfg_attr(feature = "safe", forbid(unsafe_code))] #[cfg(not(feature = "std"))] compile_error!("`std` feature is required; reserved for future `no_std` support"); mod stack; mod string; mod string_cow; mod string_ref; pub mod backend; pub use stack::StackString; pub use string::*; pub use string_cow::*; pub use string_ref::*; #[cfg(test)] mod test { #[test] fn test_size() { println!( "String: {}", std::mem::size_of::() ); println!( "Box: {}", std::mem::size_of::() ); println!( "Box>: {}", std::mem::size_of::>() ); println!("str: {}", std::mem::size_of::<&'static str>()); println!( "Cow: {}", std::mem::size_of::>() ); } } kstring-2.0.0/src/stack.rs000064400000000000000000000275660072674642500136160ustar 00000000000000use std::fmt; pub(crate) type Len = u8; /// Fixed-size stack-allocated string #[derive(Copy, Clone)] pub struct StackString { len: Len, buffer: StrBuffer, } impl StackString { pub const CAPACITY: usize = CAPACITY; pub const EMPTY: Self = Self::empty(); const fn empty() -> Self { Self { len: 0, buffer: StrBuffer::empty(), } } /// Create a `StackString` from a `&str`, if it'll fit within `Self::CAPACITY` /// /// # Examples /// /// Basic usage: /// /// ``` /// let s = kstring::StackString::<3>::try_new("foo"); /// assert_eq!(s.as_deref(), Some("foo")); /// let s = kstring::StackString::<3>::try_new("foobar"); /// assert_eq!(s, None); /// ``` #[inline] #[must_use] pub fn try_new(s: &str) -> Option { let len = s.as_bytes().len(); if len <= Self::CAPACITY { #[cfg(feature = "unsafe")] let stack = { unsafe { // SAFETY: We've confirmed `len` is within size Self::new_unchecked(s) } }; #[cfg(not(feature = "unsafe"))] let stack = { Self::new(s) }; Some(stack) } else { None } } /// Create a `StackString` from a `&str` /// /// # Panic /// /// Calling this function with a string larger than `Self::CAPACITY` will panic /// /// # Examples /// /// Basic usage: /// /// ``` /// let s = kstring::StackString::<3>::new("foo"); /// assert_eq!(s, "foo"); /// ``` #[inline] #[must_use] pub fn new(s: &str) -> Self { let len = s.as_bytes().len() as u8; debug_assert!(Self::CAPACITY <= Len::MAX.into()); let buffer = StrBuffer::new(s); Self { len, buffer } } /// Create a `StackString` from a `&str` /// /// # Safety /// /// Calling this function with a string larger than `Self::CAPACITY` is undefined behavior. /// /// # Examples /// /// Basic usage: /// /// ``` /// let s = unsafe { /// // SAFETY: Literal is short-enough /// kstring::StackString::<3>::new_unchecked("foo") /// }; /// assert_eq!(s, "foo"); /// ``` #[inline] #[must_use] #[cfg(feature = "unsafe")] pub unsafe fn new_unchecked(s: &str) -> Self { let len = s.as_bytes().len() as u8; debug_assert!(Self::CAPACITY <= Len::MAX.into()); let buffer = StrBuffer::new_unchecked(s); Self { len, buffer } } /// Extracts a string slice containing the entire `StackString`. /// /// # Examples /// /// Basic usage: /// /// ``` /// let s = kstring::StackString::<3>::try_new("foo").unwrap(); /// /// assert_eq!("foo", s.as_str()); /// ``` #[inline] #[must_use] pub fn as_str(&self) -> &str { let len = self.len as usize; #[cfg(feature = "unsafe")] unsafe { // SAFETY: Constructors guarantee that `buffer[..len]` is a `str`, // and we don't mutate the data afterwards. self.buffer.as_str_unchecked(len) } #[cfg(not(feature = "unsafe"))] self.buffer.as_str(len) } /// Converts a `StackString` into a mutable string slice. /// /// # Examples /// /// Basic usage: /// /// ``` /// let mut s = kstring::StackString::<6>::try_new("foobar").unwrap(); /// let s_mut_str = s.as_mut_str(); /// /// s_mut_str.make_ascii_uppercase(); /// /// assert_eq!("FOOBAR", s_mut_str); /// ``` #[inline] #[must_use] pub fn as_mut_str(&mut self) -> &mut str { let len = self.len as usize; #[cfg(feature = "unsafe")] unsafe { // SAFETY: Constructors guarantee that `buffer[..len]` is a `str`, // and we don't mutate the data afterwards. self.buffer.as_mut_str_unchecked(len) } #[cfg(not(feature = "unsafe"))] self.buffer.as_mut_str(len) } /// Returns the length of this `StasckString`, in bytes, not [`char`]s or /// graphemes. In other words, it might not be what a human considers the /// length of the string. /// /// # Examples /// /// Basic usage: /// /// ``` /// let a = kstring::StackString::<3>::try_new("foo").unwrap(); /// assert_eq!(a.len(), 3); /// /// let fancy_f = kstring::StackString::<4>::try_new("ƒoo").unwrap(); /// assert_eq!(fancy_f.len(), 4); /// assert_eq!(fancy_f.chars().count(), 3); /// ``` #[inline] #[must_use] pub fn len(&self) -> usize { self.len as usize } /// Returns `true` if this `StackString` has a length of zero, and `false` otherwise. /// /// # Examples /// /// Basic usage: /// /// ``` /// let mut v = kstring::StackString::<20>::EMPTY; /// assert!(v.is_empty()); /// /// let a = kstring::StackString::<3>::try_new("foo").unwrap(); /// assert!(!a.is_empty()); /// ``` #[inline] #[must_use] pub fn is_empty(&self) -> bool { self.len() == 0 } /// Truncates this `StackString`, removing all contents. /// /// # Examples /// /// Basic usage: /// /// ``` /// let mut s = kstring::StackString::<3>::try_new("foo").unwrap(); /// /// s.clear(); /// /// assert!(s.is_empty()); /// assert_eq!(0, s.len()); /// ``` #[inline] pub fn clear(&mut self) { self.len = 0; } /// Shortens this `StackString` to the specified length. /// /// If `new_len` is greater than the string's current length, this has no /// effect. /// /// Note that this method has no effect on the allocated capacity /// of the string /// /// # Panics /// /// Panics if `new_len` does not lie on a [`char`] boundary. /// /// # Examples /// /// Basic usage: /// /// ``` /// let mut s = kstring::StackString::<5>::try_new("hello").unwrap(); /// /// s.truncate(2); /// /// assert_eq!(s, "he"); /// ``` #[inline] pub fn truncate(&mut self, new_len: usize) { if new_len <= self.len() { assert!(self.is_char_boundary(new_len)); self.len = new_len as u8; } } } impl Default for StackString { fn default() -> Self { Self::empty() } } impl std::ops::Deref for StackString { type Target = str; #[inline] fn deref(&self) -> &str { self.as_str() } } impl Eq for StackString {} impl PartialEq> for StackString { #[inline] fn eq(&self, other: &StackString) -> bool { PartialEq::eq(self.as_str(), other.as_str()) } } impl PartialEq for StackString { #[inline] fn eq(&self, other: &str) -> bool { PartialEq::eq(self.as_str(), other) } } impl<'s, const CAPACITY: usize> PartialEq<&'s str> for StackString { #[inline] fn eq(&self, other: &&str) -> bool { PartialEq::eq(self.as_str(), *other) } } impl PartialEq for StackString { #[inline] fn eq(&self, other: &String) -> bool { PartialEq::eq(self.as_str(), other.as_str()) } } impl Ord for StackString { #[inline] fn cmp(&self, other: &Self) -> std::cmp::Ordering { self.as_str().cmp(other.as_str()) } } impl PartialOrd> for StackString { #[inline] fn partial_cmp(&self, other: &StackString) -> Option { self.as_str().partial_cmp(other.as_str()) } } impl PartialOrd for StackString { #[inline] fn partial_cmp(&self, other: &str) -> Option { self.as_str().partial_cmp(other) } } impl<'s, const CAPACITY: usize> PartialOrd<&'s str> for StackString { #[inline] fn partial_cmp(&self, other: &&str) -> Option { self.as_str().partial_cmp(other) } } impl PartialOrd for StackString { #[inline] fn partial_cmp(&self, other: &String) -> Option { self.as_str().partial_cmp(other.as_str()) } } impl std::hash::Hash for StackString { #[inline] fn hash(&self, state: &mut H) { self.as_str().hash(state); } } impl fmt::Debug for StackString { #[inline] fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { fmt::Debug::fmt(self.as_str(), f) } } impl fmt::Display for StackString { #[inline] fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { fmt::Display::fmt(self.as_str(), f) } } impl AsRef for StackString { #[inline] fn as_ref(&self) -> &str { self.as_str() } } impl AsRef<[u8]> for StackString { #[inline] fn as_ref(&self) -> &[u8] { self.as_bytes() } } impl AsRef for StackString { #[inline] fn as_ref(&self) -> &std::ffi::OsStr { (&**self).as_ref() } } impl AsRef for StackString { #[inline] fn as_ref(&self) -> &std::path::Path { std::path::Path::new(self) } } impl std::borrow::Borrow for StackString { #[inline] fn borrow(&self) -> &str { self.as_str() } } #[derive(Copy, Clone)] #[repr(transparent)] pub(crate) struct StrBuffer([u8; CAPACITY]); impl StrBuffer { pub(crate) const fn empty() -> Self { let array = [0; CAPACITY]; StrBuffer(array) } #[inline] pub(crate) fn new(s: &str) -> Self { let len = s.as_bytes().len(); debug_assert!(len <= CAPACITY); let mut buffer = Self::default(); if let Some(buffer) = buffer.0.get_mut(..len) { buffer.copy_from_slice(s.as_bytes()); } else { panic!("`{}` is larger than capacity {}", s, CAPACITY); } buffer } #[inline] #[cfg(not(feature = "unsafe"))] pub(crate) fn as_str(&self, len: usize) -> &str { let slice = self.0.get(..len).unwrap(); std::str::from_utf8(slice).unwrap() } #[inline] #[cfg(not(feature = "unsafe"))] pub(crate) fn as_mut_str(&mut self, len: usize) -> &mut str { let slice = self.0.get_mut(..len).unwrap(); std::str::from_utf8_mut(slice).unwrap() } } impl StrBuffer { #[inline] #[cfg(feature = "unsafe")] pub(crate) unsafe fn new_unchecked(s: &str) -> Self { let len = s.as_bytes().len(); debug_assert!(len <= CAPACITY); let mut buffer = Self::default(); buffer .0 .get_unchecked_mut(..len) .copy_from_slice(s.as_bytes()); buffer } #[inline] #[cfg(feature = "unsafe")] pub(crate) unsafe fn as_str_unchecked(&self, len: usize) -> &str { let slice = self.0.get_unchecked(..len); std::str::from_utf8_unchecked(slice) } #[inline] #[cfg(feature = "unsafe")] pub(crate) unsafe fn as_mut_str_unchecked(&mut self, len: usize) -> &mut str { let slice = self.0.get_unchecked_mut(..len); std::str::from_utf8_unchecked_mut(slice) } } impl Default for StrBuffer { fn default() -> Self { Self::empty() } } kstring-2.0.0/src/string.rs000064400000000000000000000610460072674642500140060ustar 00000000000000use std::{borrow::Cow, fmt}; use crate::stack::StackString; use crate::KStringCowBase; use crate::KStringRef; pub(crate) type StdString = std::string::String; /// A UTF-8 encoded, immutable string. pub type KString = KStringBase; /// A UTF-8 encoded, immutable string. #[derive(Clone)] #[repr(transparent)] pub struct KStringBase { inner: KStringInner, } impl KStringBase { pub const EMPTY: Self = KStringBase::from_static(""); /// Create a new empty `KStringBase`. #[inline] #[must_use] pub fn new() -> Self { Self::EMPTY } /// Create a reference to a `'static` data. #[inline] #[must_use] pub const fn from_static(other: &'static str) -> Self { Self { inner: KStringInner::from_static(other), } } /// Create an inline string, if possible #[inline] #[must_use] pub fn try_inline(other: &str) -> Option { KStringInner::try_inline(other).map(|inner| Self { inner }) } } impl KStringBase { /// Create an owned `KStringBase`. #[inline] #[must_use] pub fn from_boxed(other: crate::backend::BoxedStr) -> Self { Self { inner: KStringInner::from_boxed(other), } } /// Create an owned `KStringBase`. #[inline] #[must_use] pub fn from_string(other: StdString) -> Self { Self { inner: KStringInner::from_string(other), } } /// Create an owned `KStringBase` optimally from a reference. #[inline] #[must_use] pub fn from_ref(other: &str) -> Self { Self { inner: KStringInner::from_ref(other), } } /// Get a reference to the `KStringBase`. #[inline] #[must_use] pub fn as_ref(&self) -> KStringRef<'_> { self.inner.as_ref() } /// Extracts a string slice containing the entire `KStringBase`. #[inline] #[must_use] pub fn as_str(&self) -> &str { self.inner.as_str() } /// Convert to a mutable string type, cloning the data if necessary. #[inline] #[must_use] pub fn into_string(self) -> StdString { String::from(self.into_boxed_str()) } /// Convert to a mutable string type, cloning the data if necessary. #[inline] #[must_use] pub fn into_boxed_str(self) -> crate::backend::BoxedStr { self.inner.into_boxed_str() } /// Convert to a Cow str #[inline] #[must_use] pub fn into_cow_str(self) -> Cow<'static, str> { self.inner.into_cow_str() } } impl std::ops::Deref for KStringBase { type Target = str; #[inline] fn deref(&self) -> &str { self.as_str() } } impl Eq for KStringBase {} impl<'s, B: crate::backend::HeapStr> PartialEq> for KStringBase { #[inline] fn eq(&self, other: &Self) -> bool { PartialEq::eq(self.as_str(), other.as_str()) } } impl<'s, B: crate::backend::HeapStr> PartialEq for KStringBase { #[inline] fn eq(&self, other: &str) -> bool { PartialEq::eq(self.as_str(), other) } } impl<'s, B: crate::backend::HeapStr> PartialEq<&'s str> for KStringBase { #[inline] fn eq(&self, other: &&str) -> bool { PartialEq::eq(self.as_str(), *other) } } impl<'s, B: crate::backend::HeapStr> PartialEq for KStringBase { #[inline] fn eq(&self, other: &StdString) -> bool { PartialEq::eq(self.as_str(), other.as_str()) } } impl Ord for KStringBase { #[inline] fn cmp(&self, other: &Self) -> std::cmp::Ordering { self.as_str().cmp(other.as_str()) } } impl PartialOrd for KStringBase { #[inline] fn partial_cmp(&self, other: &Self) -> Option { self.as_str().partial_cmp(other.as_str()) } } impl std::hash::Hash for KStringBase { #[inline] fn hash(&self, state: &mut H) { self.as_str().hash(state); } } impl fmt::Debug for KStringBase { #[inline] fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { self.as_str().fmt(f) } } impl fmt::Display for KStringBase { #[inline] fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { fmt::Display::fmt(self.as_str(), f) } } impl AsRef for KStringBase { #[inline] fn as_ref(&self) -> &str { self.as_str() } } impl AsRef<[u8]> for KStringBase { #[inline] fn as_ref(&self) -> &[u8] { self.as_bytes() } } impl AsRef for KStringBase { #[inline] fn as_ref(&self) -> &std::ffi::OsStr { (&**self).as_ref() } } impl AsRef for KStringBase { #[inline] fn as_ref(&self) -> &std::path::Path { std::path::Path::new(self) } } impl std::borrow::Borrow for KStringBase { #[inline] fn borrow(&self) -> &str { self.as_str() } } impl Default for KStringBase { #[inline] fn default() -> Self { Self::new() } } impl<'s, B: crate::backend::HeapStr> From> for KStringBase { #[inline] fn from(other: KStringRef<'s>) -> Self { other.to_owned() } } impl<'s, B: crate::backend::HeapStr> From<&'s KStringRef<'s>> for KStringBase { #[inline] fn from(other: &'s KStringRef<'s>) -> Self { other.to_owned() } } impl<'s, B: crate::backend::HeapStr> From> for KStringBase { #[inline] fn from(other: KStringCowBase<'s, B>) -> Self { other.into_owned() } } impl<'s, B: crate::backend::HeapStr> From<&'s KStringCowBase<'s, B>> for KStringBase { #[inline] fn from(other: &'s KStringCowBase<'s, B>) -> Self { other.clone().into_owned() } } impl From for KStringBase { #[inline] fn from(other: StdString) -> Self { Self::from_string(other) } } impl<'s, B: crate::backend::HeapStr> From<&'s StdString> for KStringBase { #[inline] fn from(other: &'s StdString) -> Self { Self::from_ref(other) } } impl From for KStringBase { #[inline] fn from(other: crate::backend::BoxedStr) -> Self { Self::from_boxed(other) } } impl<'s, B: crate::backend::HeapStr> From<&'s crate::backend::BoxedStr> for KStringBase { #[inline] fn from(other: &'s crate::backend::BoxedStr) -> Self { Self::from_ref(other) } } impl From<&'static str> for KStringBase { #[inline] fn from(other: &'static str) -> Self { Self::from_static(other) } } impl std::str::FromStr for KStringBase { type Err = std::convert::Infallible; #[inline] fn from_str(s: &str) -> Result { Ok(Self::from_ref(s)) } } #[cfg(feature = "serde")] impl serde::Serialize for KStringBase { #[inline] fn serialize(&self, serializer: S) -> Result where S: serde::Serializer, { serializer.serialize_str(self.as_str()) } } #[cfg(feature = "serde")] impl<'de, B: crate::backend::HeapStr> serde::Deserialize<'de> for KStringBase { fn deserialize(deserializer: D) -> Result where D: serde::Deserializer<'de>, { deserializer.deserialize_string(StringVisitor(std::marker::PhantomData)) } } #[cfg(feature = "serde")] struct StringVisitor(std::marker::PhantomData); #[cfg(feature = "serde")] impl<'de, B: crate::backend::HeapStr> serde::de::Visitor<'de> for StringVisitor { type Value = KStringBase; fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result { formatter.write_str("a string") } fn visit_str(self, v: &str) -> Result where E: serde::de::Error, { Ok(Self::Value::from_ref(v)) } fn visit_string(self, v: String) -> Result where E: serde::de::Error, { Ok(Self::Value::from_string(v)) } fn visit_bytes(self, v: &[u8]) -> Result where E: serde::de::Error, { match std::str::from_utf8(v) { Ok(s) => Ok(Self::Value::from_ref(s)), Err(_) => Err(serde::de::Error::invalid_value( serde::de::Unexpected::Bytes(v), &self, )), } } fn visit_byte_buf(self, v: Vec) -> Result where E: serde::de::Error, { match String::from_utf8(v) { Ok(s) => Ok(Self::Value::from_string(s)), Err(e) => Err(serde::de::Error::invalid_value( serde::de::Unexpected::Bytes(&e.into_bytes()), &self, )), } } } use inner::KStringInner; #[cfg(not(feature = "unsafe"))] mod inner { use super::*; pub(super) enum KStringInner { Singleton(&'static str), Inline(StackString), Owned(B), } impl KStringInner { /// Create a reference to a `'static` data. #[inline] pub const fn from_static(other: &'static str) -> Self { Self::Singleton(other) } #[inline] pub fn try_inline(other: &str) -> Option { StackString::try_new(other).map(Self::Inline) } } impl KStringInner { #[inline] pub(super) fn from_boxed(other: crate::backend::BoxedStr) -> Self { #[allow(clippy::useless_conversion)] Self::Owned(B::from_boxed_str(other)) } #[inline] pub(super) fn from_string(other: StdString) -> Self { if (0..=CAPACITY).contains(&other.len()) { let inline = { StackString::new(other.as_str()) }; Self::Inline(inline) } else { Self::from_boxed(other.into_boxed_str()) } } #[inline] pub(super) fn from_ref(other: &str) -> Self { if (0..=CAPACITY).contains(&other.len()) { let inline = { StackString::new(other) }; Self::Inline(inline) } else { Self::Owned(B::from_str(other)) } } #[inline] pub(super) fn as_ref(&self) -> KStringRef<'_> { match self { Self::Singleton(s) => KStringRef::from_static(s), Self::Inline(s) => KStringRef::from_ref(s.as_str()), Self::Owned(s) => KStringRef::from_ref(s.as_str()), } } #[inline] pub(super) fn as_str(&self) -> &str { match self { Self::Singleton(s) => s, Self::Inline(s) => s.as_str(), Self::Owned(s) => s.as_str(), } } #[inline] pub(super) fn into_boxed_str(self) -> crate::backend::BoxedStr { match self { Self::Singleton(s) => crate::backend::BoxedStr::from(s), Self::Inline(s) => crate::backend::BoxedStr::from(s.as_str()), Self::Owned(s) => crate::backend::BoxedStr::from(s.as_str()), } } /// Convert to a Cow str #[inline] pub(super) fn into_cow_str(self) -> Cow<'static, str> { match self { Self::Singleton(s) => Cow::Borrowed(s), Self::Inline(s) => Cow::Owned(s.as_str().into()), Self::Owned(s) => Cow::Owned(s.as_str().into()), } } } // Explicit to avoid inlining which cuts clone times in half. // // An automatically derived `clone()` has 10ns overhead while the explicit `Deref`/`as_str` has // none of that. Being explicit and removing the `#[inline]` attribute dropped the overhead to // 5ns. // // My only guess is that the `clone()` calls we delegate to are just that much bigger than // `as_str()` that, when combined with a jump table, is blowing the icache, slowing things down. impl Clone for KStringInner { fn clone(&self) -> Self { match self { Self::Singleton(s) => Self::Singleton(s), Self::Inline(s) => Self::Inline(*s), Self::Owned(s) => Self::Owned(s.clone()), } } } #[allow(unused)] const LEN_SIZE: usize = std::mem::size_of::(); #[allow(unused)] const TAG_SIZE: usize = std::mem::size_of::(); #[allow(unused)] const MAX_CAPACITY: usize = std::mem::size_of::() - TAG_SIZE - LEN_SIZE; // Performance seems to slow down when trying to occupy all of the padding left by `String`'s // discriminant. The question is whether faster len=1-16 "allocations" outweighs going to the heap // for len=17-22. #[allow(unused)] const ALIGNED_CAPACITY: usize = std::mem::size_of::() - LEN_SIZE; #[cfg(feature = "max_inline")] const CAPACITY: usize = MAX_CAPACITY; #[cfg(not(feature = "max_inline"))] const CAPACITY: usize = ALIGNED_CAPACITY; } #[cfg(feature = "unsafe")] mod inner { use super::*; pub(super) union KStringInner { tag: TagVariant, singleton: SingletonVariant, owned: std::mem::ManuallyDrop>, inline: InlineVariant, } impl KStringInner { /// Create a reference to a `'static` data. #[inline] pub const fn from_static(other: &'static str) -> Self { Self { singleton: SingletonVariant::new(other), } } #[inline] pub fn try_inline(other: &str) -> Option { StackString::try_new(other).map(|inline| Self { inline: InlineVariant::new(inline), }) } #[inline] const fn tag(&self) -> Tag { unsafe { // SAFETY: `tag` is in the same spot in each variant self.tag.tag } } } impl KStringInner { #[inline] pub(super) fn from_boxed(other: crate::backend::BoxedStr) -> Self { #[allow(clippy::useless_conversion)] let payload = B::from_boxed_str(other); Self { owned: std::mem::ManuallyDrop::new(OwnedVariant::new(payload)), } } #[inline] pub(super) fn from_string(other: StdString) -> Self { if (0..=CAPACITY).contains(&other.len()) { let payload = unsafe { // SAFETY: range check ensured this is always safe StackString::new_unchecked(other.as_str()) }; Self { inline: InlineVariant::new(payload), } } else { Self::from_boxed(other.into_boxed_str()) } } #[inline] pub(super) fn from_ref(other: &str) -> Self { if (0..=CAPACITY).contains(&other.len()) { let payload = unsafe { // SAFETY: range check ensured this is always safe StackString::new_unchecked(other) }; Self { inline: InlineVariant::new(payload), } } else { #[allow(clippy::useless_conversion)] let payload = B::from_str(other); Self { owned: std::mem::ManuallyDrop::new(OwnedVariant::new(payload)), } } } #[inline] pub(super) fn as_ref(&self) -> KStringRef<'_> { let tag = self.tag(); unsafe { // SAFETY: `tag` ensures access to correct variant if tag.is_singleton() { KStringRef::from_static(self.singleton.payload) } else if tag.is_owned() { KStringRef::from_ref(self.owned.payload.as_str()) } else { debug_assert!(tag.is_inline()); KStringRef::from_ref(self.inline.payload.as_str()) } } } #[inline] pub(super) fn as_str(&self) -> &str { let tag = self.tag(); unsafe { // SAFETY: `tag` ensures access to correct variant if tag.is_singleton() { self.singleton.payload } else if tag.is_owned() { self.owned.payload.as_str() } else { debug_assert!(tag.is_inline()); self.inline.payload.as_str() } } } #[inline] pub(super) fn into_boxed_str(self) -> crate::backend::BoxedStr { let tag = self.tag(); unsafe { // SAFETY: `tag` ensures access to correct variant if tag.is_singleton() { crate::backend::BoxedStr::from(self.singleton.payload) } else if tag.is_owned() { crate::backend::BoxedStr::from(self.owned.payload.as_str()) } else { debug_assert!(tag.is_inline()); crate::backend::BoxedStr::from(self.inline.payload.as_ref()) } } } /// Convert to a Cow str #[inline] pub(super) fn into_cow_str(self) -> Cow<'static, str> { let tag = self.tag(); unsafe { // SAFETY: `tag` ensures access to correct variant if tag.is_singleton() { Cow::Borrowed(self.singleton.payload) } else if tag.is_owned() { Cow::Owned(self.owned.payload.as_str().into()) } else { debug_assert!(tag.is_inline()); Cow::Owned(self.inline.payload.as_str().into()) } } } } // Explicit to avoid inlining which cuts clone times in half. // // An automatically derived `clone()` has 10ns overhead while the explicit `Deref`/`as_str` has // none of that. Being explicit and removing the `#[inline]` attribute dropped the overhead to // 5ns. // // My only guess is that the `clone()` calls we delegate to are just that much bigger than // `as_str()` that, when combined with a jump table, is blowing the icache, slowing things down. impl Clone for KStringInner { fn clone(&self) -> Self { let tag = self.tag(); if tag.is_owned() { unsafe { // SAFETY: `tag` ensures access to correct variant Self { owned: std::mem::ManuallyDrop::new(OwnedVariant::new( self.owned.payload.clone(), )), } } } else { unsafe { // SAFETY: `tag` ensures access to correct variant // SAFETY: non-owned types are copyable std::mem::transmute_copy(self) } } } } impl Drop for KStringInner { fn drop(&mut self) { let tag = self.tag(); if tag.is_owned() { unsafe { // SAFETY: `tag` ensures we are using the right variant std::mem::ManuallyDrop::drop(&mut self.owned) } } } } #[allow(unused)] const LEN_SIZE: usize = std::mem::size_of::(); #[allow(unused)] const TAG_SIZE: usize = std::mem::size_of::(); #[allow(unused)] const PAYLOAD_SIZE: usize = std::mem::size_of::(); type Payload = Padding; #[allow(unused)] const TARGET_SIZE: usize = std::mem::size_of::(); type Target = crate::string::StdString; #[allow(unused)] const MAX_CAPACITY: usize = TARGET_SIZE - LEN_SIZE - TAG_SIZE; // Performance seems to slow down when trying to occupy all of the padding left by `String`'s // discriminant. The question is whether faster len=1-16 "allocations" outweighs going to the heap // for len=17-22. #[allow(unused)] const ALIGNED_CAPACITY: usize = PAYLOAD_SIZE - LEN_SIZE; #[cfg(feature = "max_inline")] const CAPACITY: usize = MAX_CAPACITY; #[cfg(not(feature = "max_inline"))] const CAPACITY: usize = ALIGNED_CAPACITY; const PAYLOAD_PAD_SIZE: usize = TARGET_SIZE - PAYLOAD_SIZE - TAG_SIZE; const INLINE_PAD_SIZE: usize = TARGET_SIZE - CAPACITY - LEN_SIZE - TAG_SIZE; #[derive(Copy, Clone)] #[repr(C)] struct TagVariant { payload: Payload, pad: Padding, tag: Tag, } static_assertions::assert_eq_size!(Target, TagVariant); #[derive(Copy, Clone)] #[repr(C)] struct SingletonVariant { payload: &'static str, pad: Padding, tag: Tag, } static_assertions::assert_eq_size!(Payload, &'static str); static_assertions::assert_eq_size!(Target, SingletonVariant); impl SingletonVariant { #[inline] const fn new(payload: &'static str) -> Self { Self { payload, pad: Padding::new(), tag: Tag::SINGLETON, } } } impl std::fmt::Debug for SingletonVariant { #[inline] fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { self.payload.fmt(f) } } #[derive(Clone)] #[repr(C)] struct OwnedVariant { payload: B, pad: Padding, tag: Tag, } static_assertions::assert_eq_size!(Payload, crate::backend::DefaultStr); static_assertions::assert_eq_size!(Target, OwnedVariant); impl OwnedVariant { #[inline] const fn new(payload: B) -> Self { Self { payload, pad: Padding::new(), tag: Tag::OWNED, } } } impl std::fmt::Debug for OwnedVariant { #[inline] fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { self.payload.fmt(f) } } #[derive(Copy, Clone)] #[repr(C)] struct InlineVariant { payload: StackString, pad: Padding, tag: Tag, } static_assertions::assert_eq_size!(Target, InlineVariant); impl InlineVariant { #[inline] const fn new(payload: StackString) -> Self { Self { payload, pad: Padding::new(), tag: Tag::INLINE, } } } impl std::fmt::Debug for InlineVariant { #[inline] fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { self.payload.fmt(f) } } #[derive(Copy, Clone, PartialEq, Eq)] #[repr(transparent)] struct Tag(u8); impl Tag { const SINGLETON: Tag = Tag(0); const OWNED: Tag = Tag(u8::MAX); const INLINE: Tag = Tag(1); #[inline] const fn is_singleton(self) -> bool { self.0 == Self::SINGLETON.0 } #[inline] const fn is_owned(self) -> bool { self.0 == Self::OWNED.0 } #[inline] const fn is_inline(self) -> bool { !self.is_singleton() && !self.is_owned() } } #[derive(Copy, Clone)] #[repr(transparent)] struct Padding([std::mem::MaybeUninit; L]); impl Padding { const fn new() -> Self { let padding = unsafe { // SAFETY: Padding, never actually used std::mem::MaybeUninit::uninit().assume_init() }; Self(padding) } } impl Default for Padding { fn default() -> Self { Self::new() } } } #[cfg(test)] mod test { use super::*; #[test] fn test_size() { println!("KString: {}", std::mem::size_of::()); } } kstring-2.0.0/src/string_cow.rs000064400000000000000000000233410072674642500146520ustar 00000000000000use std::{borrow::Cow, fmt}; use crate::KStringBase; use crate::KStringRef; use crate::KStringRefInner; type StdString = std::string::String; type BoxedStr = Box; /// A reference to a UTF-8 encoded, immutable string. pub type KStringCow<'s> = KStringCowBase<'s, crate::backend::DefaultStr>; /// A reference to a UTF-8 encoded, immutable string. #[derive(Clone)] #[repr(transparent)] pub struct KStringCowBase<'s, B = crate::backend::DefaultStr> { pub(crate) inner: KStringCowInner<'s, B>, } #[derive(Clone)] pub(crate) enum KStringCowInner<'s, B> { Borrowed(&'s str), Owned(KStringBase), } impl<'s, B> KStringCowBase<'s, B> { /// Create a new empty `KStringCowBase`. #[inline] #[must_use] pub const fn new() -> Self { Self::from_static("") } /// Create a reference to a `'static` data. #[inline] #[must_use] pub const fn from_static(other: &'static str) -> Self { Self { inner: KStringCowInner::Owned(KStringBase::from_static(other)), } } } impl<'s, B: crate::backend::HeapStr> KStringCowBase<'s, B> { /// Create an owned `KStringCowBase`. #[inline] #[must_use] pub fn from_boxed(other: BoxedStr) -> Self { Self { inner: KStringCowInner::Owned(KStringBase::from_boxed(other)), } } /// Create an owned `KStringCowBase`. #[inline] #[must_use] pub fn from_string(other: StdString) -> Self { Self { inner: KStringCowInner::Owned(KStringBase::from_string(other)), } } /// Create a reference to a borrowed data. #[inline] #[must_use] pub fn from_ref(other: &'s str) -> Self { Self { inner: KStringCowInner::Borrowed(other), } } /// Get a reference to the `KStringBase`. #[inline] #[must_use] pub fn as_ref(&self) -> KStringRef<'_> { self.inner.as_ref() } /// Clone the data into an owned-type. #[inline] #[must_use] pub fn into_owned(self) -> KStringBase { self.inner.into_owned() } /// Extracts a string slice containing the entire `KStringCowBase`. #[inline] #[must_use] pub fn as_str(&self) -> &str { self.inner.as_str() } /// Convert to a mutable string type, cloning the data if necessary. #[inline] #[must_use] pub fn into_string(self) -> StdString { String::from(self.into_boxed_str()) } /// Convert to a mutable string type, cloning the data if necessary. #[inline] #[must_use] pub fn into_boxed_str(self) -> BoxedStr { self.inner.into_boxed_str() } /// Convert to a Cow str #[inline] #[must_use] pub fn into_cow_str(self) -> Cow<'s, str> { self.inner.into_cow_str() } } impl<'s, B: crate::backend::HeapStr> KStringCowInner<'s, B> { #[inline] fn as_ref(&self) -> KStringRef<'_> { match self { Self::Borrowed(s) => KStringRef::from_ref(s), Self::Owned(s) => s.as_ref(), } } #[inline] fn into_owned(self) -> KStringBase { match self { Self::Borrowed(s) => KStringBase::from_ref(s), Self::Owned(s) => s, } } #[inline] fn as_str(&self) -> &str { match self { Self::Borrowed(s) => s, Self::Owned(s) => s.as_str(), } } #[inline] fn into_boxed_str(self) -> BoxedStr { match self { Self::Borrowed(s) => BoxedStr::from(s), Self::Owned(s) => s.into_boxed_str(), } } /// Convert to a Cow str #[inline] fn into_cow_str(self) -> Cow<'s, str> { match self { Self::Borrowed(s) => Cow::Borrowed(s), Self::Owned(s) => s.into_cow_str(), } } } impl<'s, B: crate::backend::HeapStr> std::ops::Deref for KStringCowBase<'s, B> { type Target = str; #[inline] fn deref(&self) -> &str { self.as_str() } } impl<'s, B: crate::backend::HeapStr> Eq for KStringCowBase<'s, B> {} impl<'s, B: crate::backend::HeapStr> PartialEq> for KStringCowBase<'s, B> { #[inline] fn eq(&self, other: &KStringCowBase<'s, B>) -> bool { PartialEq::eq(self.as_str(), other.as_str()) } } impl<'s, B: crate::backend::HeapStr> PartialEq for KStringCowBase<'s, B> { #[inline] fn eq(&self, other: &str) -> bool { PartialEq::eq(self.as_str(), other) } } impl<'s, B: crate::backend::HeapStr> PartialEq<&'s str> for KStringCowBase<'s, B> { #[inline] fn eq(&self, other: &&str) -> bool { PartialEq::eq(self.as_str(), *other) } } impl<'s, B: crate::backend::HeapStr> PartialEq for KStringCowBase<'s, B> { #[inline] fn eq(&self, other: &StdString) -> bool { PartialEq::eq(self.as_str(), other.as_str()) } } impl<'s, B: crate::backend::HeapStr> Ord for KStringCowBase<'s, B> { #[inline] fn cmp(&self, other: &Self) -> std::cmp::Ordering { self.as_str().cmp(other.as_str()) } } impl<'s, B: crate::backend::HeapStr> PartialOrd for KStringCowBase<'s, B> { #[inline] fn partial_cmp(&self, other: &Self) -> Option { self.as_str().partial_cmp(other.as_str()) } } impl<'s, B: crate::backend::HeapStr> std::hash::Hash for KStringCowBase<'s, B> { #[inline] fn hash(&self, state: &mut H) { self.as_str().hash(state); } } impl<'s, B: crate::backend::HeapStr> fmt::Debug for KStringCowBase<'s, B> { #[inline] fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { self.as_str().fmt(f) } } impl<'s, B: crate::backend::HeapStr> fmt::Display for KStringCowBase<'s, B> { #[inline] fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { fmt::Display::fmt(self.as_str(), f) } } impl<'s, B: crate::backend::HeapStr> AsRef for KStringCowBase<'s, B> { #[inline] fn as_ref(&self) -> &str { self.as_str() } } impl<'s, B: crate::backend::HeapStr> AsRef<[u8]> for KStringCowBase<'s, B> { #[inline] fn as_ref(&self) -> &[u8] { self.as_bytes() } } impl<'s, B: crate::backend::HeapStr> AsRef for KStringCowBase<'s, B> { #[inline] fn as_ref(&self) -> &std::ffi::OsStr { (&**self).as_ref() } } impl<'s, B: crate::backend::HeapStr> AsRef for KStringCowBase<'s, B> { #[inline] fn as_ref(&self) -> &std::path::Path { std::path::Path::new(self) } } impl<'s, B: crate::backend::HeapStr> std::borrow::Borrow for KStringCowBase<'s, B> { #[inline] fn borrow(&self) -> &str { self.as_str() } } impl<'s, B> Default for KStringCowBase<'s, B> { #[inline] fn default() -> Self { Self::new() } } impl<'s, B: crate::backend::HeapStr> From> for KStringCowBase<'s, B> { #[inline] fn from(other: KStringBase) -> Self { let inner = KStringCowInner::Owned(other); Self { inner } } } impl<'s, B: crate::backend::HeapStr> From<&'s KStringBase> for KStringCowBase<'s, B> { #[inline] fn from(other: &'s KStringBase) -> Self { let other = other.as_ref(); other.into() } } impl<'s, B: crate::backend::HeapStr> From> for KStringCowBase<'s, B> { #[inline] fn from(other: KStringRef<'s>) -> Self { match other.inner { KStringRefInner::Borrowed(s) => Self::from_ref(s), KStringRefInner::Singleton(s) => Self::from_static(s), } } } impl<'s, B: crate::backend::HeapStr> From<&'s KStringRef<'s>> for KStringCowBase<'s, B> { #[inline] fn from(other: &'s KStringRef<'s>) -> Self { match other.inner { KStringRefInner::Borrowed(s) => Self::from_ref(s), KStringRefInner::Singleton(s) => Self::from_static(s), } } } impl<'s, B: crate::backend::HeapStr> From for KStringCowBase<'s, B> { #[inline] fn from(other: StdString) -> Self { Self::from_string(other) } } impl<'s, B: crate::backend::HeapStr> From<&'s StdString> for KStringCowBase<'s, B> { #[inline] fn from(other: &'s StdString) -> Self { Self::from_ref(other.as_str()) } } impl<'s, B: crate::backend::HeapStr> From for KStringCowBase<'s, B> { #[inline] fn from(other: BoxedStr) -> Self { // Since the memory is already allocated, don't bother moving it into a FixedString Self::from_boxed(other) } } impl<'s, B: crate::backend::HeapStr> From<&'s BoxedStr> for KStringCowBase<'s, B> { #[inline] fn from(other: &'s BoxedStr) -> Self { Self::from_ref(other) } } impl<'s, B: crate::backend::HeapStr> From<&'s str> for KStringCowBase<'s, B> { #[inline] fn from(other: &'s str) -> Self { Self::from_ref(other) } } impl std::str::FromStr for KStringCowBase<'_, B> { type Err = std::convert::Infallible; #[inline] fn from_str(s: &str) -> Result { Ok(Self::from_string(s.into())) } } #[cfg(feature = "serde")] impl<'s, B: crate::backend::HeapStr> serde::Serialize for KStringCowBase<'s, B> { #[inline] fn serialize(&self, serializer: S) -> Result where S: serde::Serializer, { serializer.serialize_str(self.as_str()) } } #[cfg(feature = "serde")] impl<'de, 's, B: crate::backend::HeapStr> serde::Deserialize<'de> for KStringCowBase<'s, B> { fn deserialize(deserializer: D) -> Result where D: serde::Deserializer<'de>, { KStringBase::deserialize(deserializer).map(|s| s.into()) } } #[cfg(test)] mod test { use super::*; #[test] fn test_size() { println!("KStringCow: {}", std::mem::size_of::>()); } } kstring-2.0.0/src/string_ref.rs000064400000000000000000000141200072674642500146310ustar 00000000000000use std::fmt; use crate::KStringBase; use crate::KStringCowBase; type StdString = std::string::String; type BoxedStr = Box; /// A reference to a UTF-8 encoded, immutable string. #[derive(Copy, Clone)] #[repr(transparent)] pub struct KStringRef<'s> { pub(crate) inner: KStringRefInner<'s>, } #[derive(Copy, Clone, Debug)] pub(crate) enum KStringRefInner<'s> { Borrowed(&'s str), Singleton(&'static str), } impl<'s> KStringRef<'s> { /// Create a new empty `KStringBase`. #[inline] #[must_use] pub const fn new() -> Self { Self::from_static("") } /// Create a reference to a `'static` data. #[inline] #[must_use] pub const fn from_static(other: &'static str) -> Self { Self { inner: KStringRefInner::Singleton(other), } } /// Create a reference to a borrowed data. #[inline] #[must_use] pub fn from_ref(other: &'s str) -> Self { Self { inner: KStringRefInner::Borrowed(other), } } /// Clone the data into an owned-type. #[inline] #[must_use] #[allow(clippy::wrong_self_convention)] pub fn to_owned(&self) -> KStringBase { self.inner.to_owned() } /// Extracts a string slice containing the entire `KStringRef`. #[inline] #[must_use] pub fn as_str(&self) -> &str { self.inner.as_str() } /// Convert to a mutable string type, cloning the data if necessary. #[inline] #[must_use] pub fn into_mut(self) -> StdString { self.inner.into_mut() } } impl<'s> KStringRefInner<'s> { #[inline] #[allow(clippy::wrong_self_convention)] fn to_owned(&self) -> KStringBase { match self { Self::Borrowed(s) => KStringBase::from_ref(s), Self::Singleton(s) => KStringBase::from_static(s), } } #[inline] fn as_str(&self) -> &str { match self { Self::Borrowed(s) => s, Self::Singleton(s) => s, } } #[inline] fn into_mut(self) -> StdString { self.as_str().to_owned() } } impl<'s> std::ops::Deref for KStringRef<'s> { type Target = str; #[inline] fn deref(&self) -> &str { self.as_str() } } impl<'s> Eq for KStringRef<'s> {} impl<'s> PartialEq> for KStringRef<'s> { #[inline] fn eq(&self, other: &KStringRef<'s>) -> bool { PartialEq::eq(self.as_str(), other.as_str()) } } impl<'s> PartialEq for KStringRef<'s> { #[inline] fn eq(&self, other: &str) -> bool { PartialEq::eq(self.as_str(), other) } } impl<'s> PartialEq<&'s str> for KStringRef<'s> { #[inline] fn eq(&self, other: &&str) -> bool { PartialEq::eq(self.as_str(), *other) } } impl<'s> PartialEq for KStringRef<'s> { #[inline] fn eq(&self, other: &StdString) -> bool { PartialEq::eq(self.as_str(), other.as_str()) } } impl<'s> Ord for KStringRef<'s> { #[inline] fn cmp(&self, other: &Self) -> std::cmp::Ordering { self.as_str().cmp(other.as_str()) } } impl<'s> PartialOrd for KStringRef<'s> { #[inline] fn partial_cmp(&self, other: &Self) -> Option { self.as_str().partial_cmp(other.as_str()) } } impl<'s> std::hash::Hash for KStringRef<'s> { #[inline] fn hash(&self, state: &mut H) { self.as_str().hash(state); } } impl<'s> fmt::Debug for KStringRef<'s> { #[inline] fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { fmt::Debug::fmt(&self.inner, f) } } impl<'s> fmt::Display for KStringRef<'s> { #[inline] fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { fmt::Display::fmt(self.as_str(), f) } } impl<'s> AsRef for KStringRef<'s> { #[inline] fn as_ref(&self) -> &str { self.as_str() } } impl<'s> AsRef<[u8]> for KStringRef<'s> { #[inline] fn as_ref(&self) -> &[u8] { self.as_bytes() } } impl<'s> AsRef for KStringRef<'s> { #[inline] fn as_ref(&self) -> &std::ffi::OsStr { (&**self).as_ref() } } impl<'s> AsRef for KStringRef<'s> { #[inline] fn as_ref(&self) -> &std::path::Path { std::path::Path::new(self) } } impl<'s> std::borrow::Borrow for KStringRef<'s> { #[inline] fn borrow(&self) -> &str { self.as_str() } } impl<'s> Default for KStringRef<'s> { #[inline] fn default() -> Self { Self::new() } } impl<'s, B: crate::backend::HeapStr> From<&'s KStringBase> for KStringRef<'s> { #[inline] fn from(other: &'s KStringBase) -> Self { other.as_ref() } } impl<'s, B: crate::backend::HeapStr> From<&'s KStringCowBase<'s, B>> for KStringRef<'s> { #[inline] fn from(other: &'s KStringCowBase<'s, B>) -> Self { other.as_ref() } } impl<'s> From<&'s StdString> for KStringRef<'s> { #[inline] fn from(other: &'s StdString) -> Self { KStringRef::from_ref(other.as_str()) } } impl<'s> From<&'s BoxedStr> for KStringRef<'s> { #[inline] fn from(other: &'s BoxedStr) -> Self { Self::from_ref(other) } } impl<'s> From<&'s str> for KStringRef<'s> { #[inline] fn from(other: &'s str) -> Self { KStringRef::from_ref(other) } } #[cfg(feature = "serde")] impl<'s> serde::Serialize for KStringRef<'s> { #[inline] fn serialize(&self, serializer: S) -> Result where S: serde::Serializer, { serializer.serialize_str(self.as_str()) } } #[cfg(feature = "serde")] impl<'de: 's, 's> serde::Deserialize<'de> for KStringRef<'s> { fn deserialize(deserializer: D) -> Result where D: serde::Deserializer<'de>, { let s: &'s str = serde::Deserialize::deserialize(deserializer)?; let s = KStringRef::from_ref(s); Ok(s) } } #[cfg(test)] mod test { use super::*; #[test] fn test_size() { println!("KStringRef: {}", std::mem::size_of::>()); } }