rustversion-1.0.14/.cargo_vcs_info.json0000644000000001360000000000100135220ustar { "git": { "sha1": "7231250c8168f21103da4a99246ff485a109f8b4" }, "path_in_vcs": "" }rustversion-1.0.14/.github/FUNDING.yml000064400000000000000000000000201046102023000154570ustar 00000000000000github: dtolnay rustversion-1.0.14/.github/workflows/ci.yml000064400000000000000000000036271046102023000170350ustar 00000000000000name: CI on: push: pull_request: workflow_dispatch: schedule: [cron: "40 1 * * *"] permissions: contents: read env: RUSTFLAGS: -Dwarnings jobs: pre_ci: uses: dtolnay/.github/.github/workflows/pre_ci.yml@master test: name: Rust ${{matrix.rust}} needs: pre_ci if: needs.pre_ci.outputs.continue runs-on: ubuntu-latest strategy: fail-fast: false matrix: rust: [nightly, beta, stable, 1.56.0] timeout-minutes: 45 steps: - uses: actions/checkout@v3 - uses: dtolnay/rust-toolchain@master with: toolchain: ${{matrix.rust}} - name: Enable type layout randomization run: echo RUSTFLAGS=${RUSTFLAGS}\ -Zrandomize-layout >> $GITHUB_ENV if: matrix.rust == 'nightly' - run: cargo test msrv: name: Rust 1.31.0 needs: pre_ci if: needs.pre_ci.outputs.continue runs-on: ubuntu-latest timeout-minutes: 45 steps: - uses: actions/checkout@v3 - uses: dtolnay/rust-toolchain@1.31.0 - run: cargo check clippy: name: Clippy runs-on: ubuntu-latest if: github.event_name != 'pull_request' timeout-minutes: 45 steps: - uses: actions/checkout@v3 - uses: dtolnay/rust-toolchain@clippy - run: cargo clippy --tests -- -Dclippy::all -Dclippy::pedantic miri: name: Miri needs: pre_ci if: needs.pre_ci.outputs.continue runs-on: ubuntu-latest timeout-minutes: 45 steps: - uses: actions/checkout@v3 - uses: dtolnay/rust-toolchain@miri - run: cargo miri setup - run: cargo miri test env: MIRIFLAGS: -Zmiri-strict-provenance outdated: name: Outdated runs-on: ubuntu-latest if: github.event_name != 'pull_request' timeout-minutes: 45 steps: - uses: actions/checkout@v3 - uses: dtolnay/install@cargo-outdated - run: cargo outdated --workspace --exit-code 1 rustversion-1.0.14/.gitignore000064400000000000000000000000361046102023000143010ustar 00000000000000/target **/*.rs.bk Cargo.lock rustversion-1.0.14/Cargo.toml0000644000000022050000000000100115170ustar # 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" rust-version = "1.31" name = "rustversion" version = "1.0.14" authors = ["David Tolnay "] build = "build/build.rs" description = "Conditional compilation according to rustc compiler version" documentation = "https://docs.rs/rustversion" readme = "README.md" categories = [ "development-tools::build-utils", "no-std", "no-std::no-alloc", ] license = "MIT OR Apache-2.0" repository = "https://github.com/dtolnay/rustversion" [package.metadata.docs.rs] rustdoc-args = ["--generate-link-to-definition"] targets = ["x86_64-unknown-linux-gnu"] [lib] proc-macro = true [dev-dependencies.trybuild] version = "1.0.49" features = ["diff"] rustversion-1.0.14/Cargo.toml.orig000064400000000000000000000012251046102023000152010ustar 00000000000000[package] name = "rustversion" version = "1.0.14" authors = ["David Tolnay "] build = "build/build.rs" categories = ["development-tools::build-utils", "no-std", "no-std::no-alloc"] description = "Conditional compilation according to rustc compiler version" documentation = "https://docs.rs/rustversion" edition = "2018" license = "MIT OR Apache-2.0" repository = "https://github.com/dtolnay/rustversion" rust-version = "1.31" [lib] proc-macro = true [dev-dependencies] trybuild = { version = "1.0.49", features = ["diff"] } [package.metadata.docs.rs] targets = ["x86_64-unknown-linux-gnu"] rustdoc-args = ["--generate-link-to-definition"] rustversion-1.0.14/LICENSE-APACHE000064400000000000000000000227731046102023000142510ustar 00000000000000 Apache License Version 2.0, January 2004 http://www.apache.org/licenses/ TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 1. Definitions. "License" shall mean the terms and conditions for use, reproduction, and distribution as defined by Sections 1 through 9 of this document. "Licensor" shall mean the copyright owner or entity authorized by the copyright owner that is granting the License. "Legal Entity" shall mean the union of the acting entity and all other entities that control, are controlled by, or are under common control with that entity. For the purposes of this definition, "control" means (i) the power, direct or indirect, to cause the direction or management of such entity, whether by contract or otherwise, or (ii) ownership of fifty percent (50%) or more of the outstanding shares, or (iii) beneficial ownership of such entity. "You" (or "Your") shall mean an individual or Legal Entity exercising permissions granted by this License. "Source" form shall mean the preferred form for making modifications, including but not limited to software source code, documentation source, and configuration files. 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END OF TERMS AND CONDITIONS rustversion-1.0.14/LICENSE-MIT000064400000000000000000000017771046102023000137620ustar 00000000000000Permission 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. rustversion-1.0.14/README.md000064400000000000000000000103351046102023000135730ustar 00000000000000Compiler version cfg ==================== [github](https://github.com/dtolnay/rustversion) [crates.io](https://crates.io/crates/rustversion) [docs.rs](https://docs.rs/rustversion) [build status](https://github.com/dtolnay/rustversion/actions?query=branch%3Amaster) This crate provides macros for conditional compilation according to rustc compiler version, analogous to [`#[cfg(...)]`][cfg] and [`#[cfg_attr(...)]`][cfg_attr]. [cfg]: https://doc.rust-lang.org/reference/conditional-compilation.html#the-cfg-attribute [cfg_attr]: https://doc.rust-lang.org/reference/conditional-compilation.html#the-cfg_attr-attribute ```toml [dependencies] rustversion = "1.0" ```
## Selectors - `#[rustversion::stable]` —
True on any stable compiler. - `#[rustversion::stable(1.34)]` —
True on exactly the specified stable compiler. - `#[rustversion::beta]` —
True on any beta compiler. - `#[rustversion::nightly]` —
True on any nightly compiler or dev build. - `#[rustversion::nightly(2019-01-01)]` —
True on exactly one nightly. - `#[rustversion::since(1.34)]` —
True on that stable release and any later compiler, including beta and nightly. - `#[rustversion::since(2019-01-01)]` —
True on that nightly and all newer ones. - `#[rustversion::before(`version or date`)]` —
Negative of *#[rustversion::since(...)]*. - `#[rustversion::not(`selector`)]` —
Negative of any selector; for example *#[rustversion::not(nightly)]*. - `#[rustversion::any(`selectors...`)]` —
True if any of the comma-separated selectors is true; for example *#[rustversion::any(stable, beta)]*. - `#[rustversion::all(`selectors...`)]` —
True if all of the comma-separated selectors are true; for example *#[rustversion::all(since(1.31), before(1.34))]*. - `#[rustversion::attr(`selector`, `attribute`)]` —
For conditional inclusion of attributes; analogous to `cfg_attr`.
## Use cases Providing additional trait impls as types are stabilized in the standard library without breaking compatibility with older compilers; in this case Pin\ stabilized in [Rust 1.33][pin]: [pin]: https://blog.rust-lang.org/2019/02/28/Rust-1.33.0.html#pinning ```rust #[rustversion::since(1.33)] use std::pin::Pin; #[rustversion::since(1.33)] impl MyTrait for Pin

{ /* ... */ } ``` Similar but for language features; the ability to control alignment greater than 1 of packed structs was stabilized in [Rust 1.33][packed]. [packed]: https://github.com/rust-lang/rust/blob/master/RELEASES.md#version-1330-2019-02-28 ```rust #[rustversion::attr(before(1.33), repr(packed))] #[rustversion::attr(since(1.33), repr(packed(2)))] struct Six(i16, i32); fn main() { println!("{}", std::mem::align_of::()); } ``` Augmenting code with `const` as const impls are stabilized in the standard library. This use of `const` as an attribute is recognized as a special case by the rustversion::attr macro. ```rust use std::time::Duration; #[rustversion::attr(since(1.32), const)] fn duration_as_days(dur: Duration) -> u64 { dur.as_secs() / 60 / 60 / 24 } ```
#### License Licensed under either of Apache License, Version 2.0 or MIT license at your option.
Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in this crate by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions. rustversion-1.0.14/build/build.rs000064400000000000000000000044441046102023000150640ustar 00000000000000#![allow( clippy::enum_glob_use, clippy::must_use_candidate, clippy::single_match_else )] mod rustc; use std::env; use std::ffi::OsString; use std::fs; use std::path::Path; use std::process::{self, Command}; fn main() { println!("cargo:rerun-if-changed=build/build.rs"); let rustc = env::var_os("RUSTC").unwrap_or_else(|| OsString::from("rustc")); let mut is_clippy_driver = false; let version = loop { let mut command = Command::new(&rustc); if is_clippy_driver { command.arg("--rustc"); } command.arg("--version"); let output = match command.output() { Ok(output) => output, Err(e) => { let rustc = rustc.to_string_lossy(); eprintln!("Error: failed to run `{} --version`: {}", rustc, e); process::exit(1); } }; let string = match String::from_utf8(output.stdout) { Ok(string) => string, Err(e) => { let rustc = rustc.to_string_lossy(); eprintln!( "Error: failed to parse output of `{} --version`: {}", rustc, e, ); process::exit(1); } }; break match rustc::parse(&string) { rustc::ParseResult::Success(version) => version, rustc::ParseResult::OopsClippy if !is_clippy_driver => { is_clippy_driver = true; continue; } rustc::ParseResult::Unrecognized | rustc::ParseResult::OopsClippy => { eprintln!( "Error: unexpected output from `rustc --version`: {:?}\n\n\ Please file an issue in https://github.com/dtolnay/rustversion", string ); process::exit(1); } }; }; if version.minor < 38 { // Prior to 1.38, a #[proc_macro] is not allowed to be named `cfg`. println!("cargo:rustc-cfg=cfg_macro_not_allowed"); } let version = format!("{:#?}\n", version); let out_dir = env::var_os("OUT_DIR").expect("OUT_DIR not set"); let out_file = Path::new(&out_dir).join("version.expr"); fs::write(out_file, version).expect("failed to write version.expr"); } rustversion-1.0.14/build/rustc.rs000064400000000000000000000071151046102023000151230ustar 00000000000000use self::Channel::*; use std::fmt::{self, Debug}; pub enum ParseResult { Success(Version), OopsClippy, Unrecognized, } #[cfg_attr(test, derive(PartialEq))] pub struct Version { pub minor: u16, pub patch: u16, pub channel: Channel, } #[cfg_attr(test, derive(PartialEq))] pub enum Channel { Stable, Beta, Nightly(Date), Dev, } #[cfg_attr(test, derive(PartialEq))] pub struct Date { pub year: u16, pub month: u8, pub day: u8, } pub fn parse(string: &str) -> ParseResult { let last_line = string.lines().last().unwrap_or(string); let mut words = last_line.trim().split(' '); match words.next() { Some("rustc") => {} Some(word) if word.starts_with("clippy") => return ParseResult::OopsClippy, Some(_) | None => return ParseResult::Unrecognized, } parse_words(&mut words).map_or(ParseResult::Unrecognized, ParseResult::Success) } fn parse_words(words: &mut dyn Iterator) -> Option { let mut version_channel = words.next()?.split('-'); let version = version_channel.next()?; let channel = version_channel.next(); let mut digits = version.split('.'); let major = digits.next()?; if major != "1" { return None; } let minor = digits.next()?.parse().ok()?; let patch = digits.next().unwrap_or("0").parse().ok()?; let channel = match channel { None => Stable, Some(channel) if channel == "dev" => Dev, Some(channel) if channel.starts_with("beta") => Beta, Some(channel) if channel == "nightly" => match words.next() { Some(hash) if hash.starts_with('(') => match words.next() { None if hash.ends_with(')') => Dev, Some(date) if date.ends_with(')') => { let mut date = date[..date.len() - 1].split('-'); let year = date.next()?.parse().ok()?; let month = date.next()?.parse().ok()?; let day = date.next()?.parse().ok()?; match date.next() { None => Nightly(Date { year, month, day }), Some(_) => return None, } } None | Some(_) => return None, }, Some(_) => return None, None => Dev, }, Some(_) => return None, }; Some(Version { minor, patch, channel, }) } impl Debug for Version { fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { formatter .debug_struct("crate::version::Version") .field("minor", &self.minor) .field("patch", &self.patch) .field("channel", &self.channel) .finish() } } impl Debug for Channel { fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { match self { Channel::Stable => formatter.write_str("crate::version::Channel::Stable"), Channel::Beta => formatter.write_str("crate::version::Channel::Beta"), Channel::Nightly(date) => formatter .debug_tuple("crate::version::Channel::Nightly") .field(date) .finish(), Channel::Dev => formatter.write_str("crate::version::Channel::Dev"), } } } impl Debug for Date { fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { formatter .debug_struct("crate::date::Date") .field("year", &self.year) .field("month", &self.month) .field("day", &self.day) .finish() } } rustversion-1.0.14/src/attr.rs000064400000000000000000000015661046102023000144310ustar 00000000000000use crate::error::{Error, Result}; use crate::expr::{self, Expr}; use crate::{iter, token}; use proc_macro::{Span, TokenStream}; pub struct Args { pub condition: Expr, pub then: Then, } pub enum Then { Const(Span), Attribute(TokenStream), } pub fn parse(input: TokenStream) -> Result { let ref mut input = iter::new(input); let condition = expr::parse(input)?; token::parse_punct(input, ',')?; if input.peek().is_none() { return Err(Error::new(Span::call_site(), "expected one or more attrs")); } let const_span = token::parse_optional_keyword(input, "const"); let then = if let Some(const_span) = const_span { token::parse_optional_punct(input, ','); token::parse_end(input)?; Then::Const(const_span) } else { Then::Attribute(input.collect()) }; Ok(Args { condition, then }) } rustversion-1.0.14/src/bound.rs000064400000000000000000000036761046102023000145720ustar 00000000000000use crate::date::{self, Date}; use crate::error::{Error, Result}; use crate::iter::Iter; use crate::release::{self, Release}; use crate::time; use crate::version::{Channel::*, Version}; use proc_macro::{Group, TokenTree}; use std::cmp::Ordering; pub enum Bound { Nightly(Date), Stable(Release), } pub fn parse(paren: Group, iter: Iter) -> Result { if let Some(TokenTree::Literal(literal)) = iter.peek() { let repr = literal.to_string(); if repr.starts_with(|ch: char| ch.is_ascii_digit()) { if repr.contains('.') { return release::parse(paren, iter).map(Bound::Stable); } else { return date::parse(paren, iter).map(Bound::Nightly); } } } let msg = format!( "expected rustc release number like 1.31, or nightly date like {}", time::today(), ); Err(Error::group(paren, msg)) } impl PartialEq for Version { fn eq(&self, rhs: &Bound) -> bool { match rhs { Bound::Nightly(date) => match self.channel { Stable | Beta | Dev => false, Nightly(nightly) => nightly == *date, }, Bound::Stable(release) => { self.minor == release.minor && release.patch.map_or(true, |patch| self.patch == patch) } } } } impl PartialOrd for Version { fn partial_cmp(&self, rhs: &Bound) -> Option { match rhs { Bound::Nightly(date) => match self.channel { Stable | Beta => Some(Ordering::Less), Nightly(nightly) => Some(nightly.cmp(date)), Dev => Some(Ordering::Greater), }, Bound::Stable(release) => { let version = (self.minor, self.patch); let bound = (release.minor, release.patch.unwrap_or(0)); Some(version.cmp(&bound)) } } } } rustversion-1.0.14/src/constfn.rs000064400000000000000000000034431046102023000151250ustar 00000000000000use crate::error::{Error, Result}; use proc_macro::{Ident, Span, TokenStream, TokenTree}; use std::iter; #[derive(PartialOrd, PartialEq)] enum Qualifiers { None, Async, Unsafe, Extern, Abi, } impl Qualifiers { fn from_ident(ident: &Ident) -> Self { match ident.to_string().as_str() { "async" => Qualifiers::Async, "unsafe" => Qualifiers::Unsafe, "extern" => Qualifiers::Extern, _ => Qualifiers::None, } } } pub(crate) fn insert_const(input: TokenStream, const_span: Span) -> Result { let ref mut input = crate::iter::new(input); let mut out = TokenStream::new(); let mut qualifiers = Qualifiers::None; let mut pending = Vec::new(); while let Some(token) = input.next() { match token { TokenTree::Ident(ref ident) if ident.to_string() == "fn" => { let const_ident = Ident::new("const", const_span); out.extend(iter::once(TokenTree::Ident(const_ident))); out.extend(pending); out.extend(iter::once(token)); out.extend(input); return Ok(out); } TokenTree::Ident(ref ident) if Qualifiers::from_ident(ident) > qualifiers => { qualifiers = Qualifiers::from_ident(ident); pending.push(token); } TokenTree::Literal(_) if qualifiers == Qualifiers::Extern => { qualifiers = Qualifiers::Abi; pending.push(token); } _ => { qualifiers = Qualifiers::None; out.extend(pending.drain(..)); out.extend(iter::once(token)); } } } Err(Error::new(const_span, "only allowed on a fn item")) } rustversion-1.0.14/src/date.rs000064400000000000000000000025761046102023000143760ustar 00000000000000use crate::error::{Error, Result}; use crate::iter::Iter; use crate::{time, token}; use proc_macro::Group; use std::fmt::{self, Display}; #[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord)] pub struct Date { pub year: u16, pub month: u8, pub day: u8, } impl Display for Date { fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { write!( formatter, "{:04}-{:02}-{:02}", self.year, self.month, self.day, ) } } pub fn parse(paren: Group, iter: Iter) -> Result { try_parse(iter).map_err(|_| { let msg = format!("expected nightly date, like {}", time::today()); Error::group(paren, msg) }) } fn try_parse(iter: Iter) -> Result { let year = token::parse_literal(iter).map_err(drop)?; token::parse_punct(iter, '-').map_err(drop)?; let month = token::parse_literal(iter).map_err(drop)?; token::parse_punct(iter, '-').map_err(drop)?; let day = token::parse_literal(iter).map_err(drop)?; let year = year.to_string().parse::().map_err(drop)?; let month = month.to_string().parse::().map_err(drop)?; let day = day.to_string().parse::().map_err(drop)?; if year >= 3000 || month > 12 || day > 31 { return Err(()); } Ok(Date { year: year as u16, month: month as u8, day: day as u8, }) } rustversion-1.0.14/src/error.rs000064400000000000000000000032621046102023000146030ustar 00000000000000use proc_macro::{Delimiter, Group, Ident, Literal, Punct, Spacing, Span, TokenStream, TokenTree}; use std::fmt::Display; use std::iter::FromIterator; pub type Result = std::result::Result; pub struct Error { begin: Span, end: Span, msg: String, } impl Error { pub fn new(span: Span, msg: impl Display) -> Self { Self::new2(span, span, msg) } pub fn new2(begin: Span, end: Span, msg: impl Display) -> Self { Error { begin, end, msg: msg.to_string(), } } pub fn group(group: Group, msg: impl Display) -> Self { let mut iter = group.stream().into_iter(); let delimiter = group.span(); let begin = iter.next().map_or(delimiter, |t| t.span()); let end = iter.last().map_or(begin, |t| t.span()); Self::new2(begin, end, msg) } pub fn into_compile_error(self) -> TokenStream { // compile_error! { $msg } TokenStream::from_iter(vec![ TokenTree::Ident(Ident::new("compile_error", self.begin)), TokenTree::Punct({ let mut punct = Punct::new('!', Spacing::Alone); punct.set_span(self.begin); punct }), TokenTree::Group({ let mut group = Group::new(Delimiter::Brace, { TokenStream::from_iter(vec![TokenTree::Literal({ let mut string = Literal::string(&self.msg); string.set_span(self.end); string })]) }); group.set_span(self.end); group }), ]) } } rustversion-1.0.14/src/expand.rs000064400000000000000000000052721046102023000147340ustar 00000000000000use crate::attr::{self, Then}; use crate::error::{Error, Result}; use crate::{constfn, expr, iter, token}; use proc_macro::{Delimiter, Group, Ident, Punct, Spacing, Span, TokenStream, TokenTree}; use std::iter::FromIterator; pub fn cfg(introducer: &str, args: TokenStream, input: TokenStream) -> TokenStream { try_cfg(introducer, args, input).unwrap_or_else(Error::into_compile_error) } fn try_cfg(introducer: &str, args: TokenStream, input: TokenStream) -> Result { let introducer = Ident::new(introducer, Span::call_site()); let mut full_args = TokenStream::from(TokenTree::Ident(introducer)); if !args.is_empty() { full_args.extend(std::iter::once(TokenTree::Group(Group::new( Delimiter::Parenthesis, args, )))); } let ref mut full_args = iter::new(full_args); let expr = expr::parse(full_args)?; token::parse_end(full_args)?; if expr.eval(crate::RUSTVERSION) { Ok(input) } else { Ok(TokenStream::new()) } } pub fn try_attr(args: attr::Args, input: TokenStream) -> Result { if !args.condition.eval(crate::RUSTVERSION) { return Ok(input); } match args.then { Then::Const(const_token) => constfn::insert_const(input, const_token), Then::Attribute(then) => { // #[cfg_attr(all(), #then)] Ok(TokenStream::from_iter( vec![ TokenTree::Punct(Punct::new('#', Spacing::Alone)), TokenTree::Group(Group::new( Delimiter::Bracket, TokenStream::from_iter(vec![ TokenTree::Ident(Ident::new("cfg_attr", Span::call_site())), TokenTree::Group(Group::new( Delimiter::Parenthesis, TokenStream::from_iter( vec![ TokenTree::Ident(Ident::new("all", Span::call_site())), TokenTree::Group(Group::new( Delimiter::Parenthesis, TokenStream::new(), )), TokenTree::Punct(Punct::new(',', Spacing::Alone)), ] .into_iter() .chain(then), ), )), ]), )), ] .into_iter() .chain(input), )) } } } rustversion-1.0.14/src/expr.rs000064400000000000000000000121051046102023000144240ustar 00000000000000use crate::bound::{self, Bound}; use crate::date::{self, Date}; use crate::error::{Error, Result}; use crate::iter::{self, Iter}; use crate::release::{self, Release}; use crate::token; use crate::version::{Channel, Version}; use proc_macro::{Ident, Span, TokenTree}; pub enum Expr { Stable, Beta, Nightly, Date(Date), Since(Bound), Before(Bound), Release(Release), Not(Box), Any(Vec), All(Vec), } impl Expr { pub fn eval(&self, rustc: Version) -> bool { use self::Expr::*; match self { Stable => rustc.channel == Channel::Stable, Beta => rustc.channel == Channel::Beta, Nightly => match rustc.channel { Channel::Nightly(_) | Channel::Dev => true, Channel::Stable | Channel::Beta => false, }, Date(date) => match rustc.channel { Channel::Nightly(rustc) => rustc == *date, Channel::Stable | Channel::Beta | Channel::Dev => false, }, Since(bound) => rustc >= *bound, Before(bound) => rustc < *bound, Release(release) => { rustc.channel == Channel::Stable && rustc.minor == release.minor && release.patch.map_or(true, |patch| rustc.patch == patch) } Not(expr) => !expr.eval(rustc), Any(exprs) => exprs.iter().any(|e| e.eval(rustc)), All(exprs) => exprs.iter().all(|e| e.eval(rustc)), } } } pub fn parse(iter: Iter) -> Result { match &iter.next() { Some(TokenTree::Ident(i)) if i.to_string() == "stable" => parse_stable(iter), Some(TokenTree::Ident(i)) if i.to_string() == "beta" => Ok(Expr::Beta), Some(TokenTree::Ident(i)) if i.to_string() == "nightly" => parse_nightly(iter), Some(TokenTree::Ident(i)) if i.to_string() == "since" => parse_since(i, iter), Some(TokenTree::Ident(i)) if i.to_string() == "before" => parse_before(i, iter), Some(TokenTree::Ident(i)) if i.to_string() == "not" => parse_not(i, iter), Some(TokenTree::Ident(i)) if i.to_string() == "any" => parse_any(i, iter), Some(TokenTree::Ident(i)) if i.to_string() == "all" => parse_all(i, iter), unexpected => { let span = unexpected .as_ref() .map_or_else(Span::call_site, TokenTree::span); Err(Error::new(span, "expected one of `stable`, `beta`, `nightly`, `since`, `before`, `not`, `any`, `all`")) } } } fn parse_nightly(iter: Iter) -> Result { let paren = match token::parse_optional_paren(iter) { Some(group) => group, None => return Ok(Expr::Nightly), }; let ref mut inner = iter::new(paren.stream()); let date = date::parse(paren, inner)?; token::parse_optional_punct(inner, ','); token::parse_end(inner)?; Ok(Expr::Date(date)) } fn parse_stable(iter: Iter) -> Result { let paren = match token::parse_optional_paren(iter) { Some(group) => group, None => return Ok(Expr::Stable), }; let ref mut inner = iter::new(paren.stream()); let release = release::parse(paren, inner)?; token::parse_optional_punct(inner, ','); token::parse_end(inner)?; Ok(Expr::Release(release)) } fn parse_since(introducer: &Ident, iter: Iter) -> Result { let paren = token::parse_paren(introducer, iter)?; let ref mut inner = iter::new(paren.stream()); let bound = bound::parse(paren, inner)?; token::parse_optional_punct(inner, ','); token::parse_end(inner)?; Ok(Expr::Since(bound)) } fn parse_before(introducer: &Ident, iter: Iter) -> Result { let paren = token::parse_paren(introducer, iter)?; let ref mut inner = iter::new(paren.stream()); let bound = bound::parse(paren, inner)?; token::parse_optional_punct(inner, ','); token::parse_end(inner)?; Ok(Expr::Before(bound)) } fn parse_not(introducer: &Ident, iter: Iter) -> Result { let paren = token::parse_paren(introducer, iter)?; let ref mut inner = iter::new(paren.stream()); let expr = self::parse(inner)?; token::parse_optional_punct(inner, ','); token::parse_end(inner)?; Ok(Expr::Not(Box::new(expr))) } fn parse_any(introducer: &Ident, iter: Iter) -> Result { let paren = token::parse_paren(introducer, iter)?; let ref mut inner = iter::new(paren.stream()); let exprs = parse_comma_separated(inner)?; Ok(Expr::Any(exprs.into_iter().collect())) } fn parse_all(introducer: &Ident, iter: Iter) -> Result { let paren = token::parse_paren(introducer, iter)?; let ref mut inner = iter::new(paren.stream()); let exprs = parse_comma_separated(inner)?; Ok(Expr::All(exprs.into_iter().collect())) } fn parse_comma_separated(iter: Iter) -> Result> { let mut exprs = Vec::new(); while iter.peek().is_some() { let expr = self::parse(iter)?; exprs.push(expr); if iter.peek().is_none() { break; } token::parse_punct(iter, ',')?; } Ok(exprs) } rustversion-1.0.14/src/iter.rs000064400000000000000000000020451046102023000144130ustar 00000000000000use proc_macro::{token_stream, Delimiter, TokenStream, TokenTree}; pub type Iter<'a> = &'a mut IterImpl; pub struct IterImpl { stack: Vec, peeked: Option, } pub fn new(tokens: TokenStream) -> IterImpl { IterImpl { stack: vec![tokens.into_iter()], peeked: None, } } impl IterImpl { pub fn peek(&mut self) -> Option<&TokenTree> { self.peeked = self.next(); self.peeked.as_ref() } } impl Iterator for IterImpl { type Item = TokenTree; fn next(&mut self) -> Option { if let Some(tt) = self.peeked.take() { return Some(tt); } loop { let top = self.stack.last_mut()?; match top.next() { None => drop(self.stack.pop()), Some(TokenTree::Group(ref group)) if group.delimiter() == Delimiter::None => { self.stack.push(group.stream().into_iter()); } Some(tt) => return Some(tt), } } } } rustversion-1.0.14/src/lib.rs000064400000000000000000000170221046102023000142170ustar 00000000000000//! [![github]](https://github.com/dtolnay/rustversion) [![crates-io]](https://crates.io/crates/rustversion) [![docs-rs]](https://docs.rs/rustversion) //! //! [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 //! //!
//! //! This crate provides macros for conditional compilation according to rustc //! compiler version, analogous to [`#[cfg(...)]`][cfg] and //! [`#[cfg_attr(...)]`][cfg_attr]. //! //! [cfg]: https://doc.rust-lang.org/reference/conditional-compilation.html#the-cfg-attribute //! [cfg_attr]: https://doc.rust-lang.org/reference/conditional-compilation.html#the-cfg_attr-attribute //! //!
//! //! # Selectors //! //! -

//! #[rustversion::stable] //! —
//! True on any stable compiler. //!

//! //! -

//! #[rustversion::stable(1.34)] //! —
//! True on exactly the specified stable compiler. //!

//! //! -

//! #[rustversion::beta] //! —
//! True on any beta compiler. //!

//! //! -

//! #[rustversion::nightly] //! —
//! True on any nightly compiler or dev build. //!

//! //! -

//! #[rustversion::nightly(2019-01-01)] //! —
//! True on exactly one nightly. //!

//! //! -

//! #[rustversion::since(1.34)] //! —
//! True on that stable release and any later compiler, including beta and //! nightly. //!

//! //! -

//! #[rustversion::since(2019-01-01)] //! —
//! True on that nightly and all newer ones. //!

//! //! -

//! #[rustversion::before(version or date)] //! —
//! Negative of #[rustversion::since(...)]. //!

//! //! -

//! #[rustversion::not(selector)] //! —
//! Negative of any selector; for example #[rustversion::not(nightly)]. //!

//! //! -

//! #[rustversion::any(selectors...)] //! —
//! True if any of the comma-separated selectors is true; for example //! #[rustversion::any(stable, beta)]. //!

//! //! -

//! #[rustversion::all(selectors...)] //! —
//! True if all of the comma-separated selectors are true; for example //! #[rustversion::all(since(1.31), before(1.34))]. //!

//! //! -

//! #[rustversion::attr(selector, attribute)] //! —
//! For conditional inclusion of attributes; analogous to //! cfg_attr. //!

//! //!
//! //! # Use cases //! //! Providing additional trait impls as types are stabilized in the standard library //! without breaking compatibility with older compilers; in this case Pin\ //! stabilized in [Rust 1.33][pin]: //! //! [pin]: https://blog.rust-lang.org/2019/02/28/Rust-1.33.0.html#pinning //! //! ``` //! # trait MyTrait {} //! # //! #[rustversion::since(1.33)] //! use std::pin::Pin; //! //! #[rustversion::since(1.33)] //! impl MyTrait for Pin

{ //! /* ... */ //! } //! ``` //! //! Similar but for language features; the ability to control alignment greater than //! 1 of packed structs was stabilized in [Rust 1.33][packed]. //! //! [packed]: https://github.com/rust-lang/rust/blob/master/RELEASES.md#version-1330-2019-02-28 //! //! ``` //! #[rustversion::attr(before(1.33), repr(packed))] //! #[rustversion::attr(since(1.33), repr(packed(2)))] //! struct Six(i16, i32); //! //! fn main() { //! println!("{}", std::mem::align_of::()); //! } //! ``` //! //! Augmenting code with `const` as const impls are stabilized in the standard //! library. This use of `const` as an attribute is recognized as a special case //! by the rustversion::attr macro. //! //! ``` //! use std::time::Duration; //! //! #[rustversion::attr(since(1.32), const)] //! fn duration_as_days(dur: Duration) -> u64 { //! dur.as_secs() / 60 / 60 / 24 //! } //! ``` //! //!
#![doc(html_root_url = "https://docs.rs/rustversion/1.0.14")] #![allow( clippy::cast_lossless, clippy::cast_possible_truncation, clippy::derive_partial_eq_without_eq, clippy::doc_markdown, clippy::enum_glob_use, clippy::from_iter_instead_of_collect, // https://github.com/rust-lang/rust-clippy/issues/8539 clippy::iter_with_drain, clippy::module_name_repetitions, clippy::must_use_candidate, clippy::needless_doctest_main, clippy::needless_pass_by_value, clippy::redundant_else, clippy::toplevel_ref_arg, clippy::unreadable_literal )] extern crate proc_macro; mod attr; mod bound; mod constfn; mod date; mod error; mod expand; mod expr; mod iter; mod release; mod time; mod token; mod version; use crate::error::Error; use crate::version::Version; use proc_macro::TokenStream; const RUSTVERSION: Version = include!(concat!(env!("OUT_DIR"), "/version.expr")); #[proc_macro_attribute] pub fn stable(args: TokenStream, input: TokenStream) -> TokenStream { expand::cfg("stable", args, input) } #[proc_macro_attribute] pub fn beta(args: TokenStream, input: TokenStream) -> TokenStream { expand::cfg("beta", args, input) } #[proc_macro_attribute] pub fn nightly(args: TokenStream, input: TokenStream) -> TokenStream { expand::cfg("nightly", args, input) } #[proc_macro_attribute] pub fn since(args: TokenStream, input: TokenStream) -> TokenStream { expand::cfg("since", args, input) } #[proc_macro_attribute] pub fn before(args: TokenStream, input: TokenStream) -> TokenStream { expand::cfg("before", args, input) } #[proc_macro_attribute] pub fn not(args: TokenStream, input: TokenStream) -> TokenStream { expand::cfg("not", args, input) } #[proc_macro_attribute] pub fn any(args: TokenStream, input: TokenStream) -> TokenStream { expand::cfg("any", args, input) } #[proc_macro_attribute] pub fn all(args: TokenStream, input: TokenStream) -> TokenStream { expand::cfg("all", args, input) } #[proc_macro_attribute] pub fn attr(args: TokenStream, input: TokenStream) -> TokenStream { attr::parse(args) .and_then(|args| expand::try_attr(args, input)) .unwrap_or_else(Error::into_compile_error) } #[cfg(not(cfg_macro_not_allowed))] #[proc_macro] pub fn cfg(input: TokenStream) -> TokenStream { use proc_macro::{Ident, Span, TokenTree}; (|| { let ref mut args = iter::new(input); let expr = expr::parse(args)?; token::parse_end(args)?; let boolean = expr.eval(RUSTVERSION); let ident = Ident::new(&boolean.to_string(), Span::call_site()); Ok(TokenStream::from(TokenTree::Ident(ident))) })() .unwrap_or_else(Error::into_compile_error) } rustversion-1.0.14/src/release.rs000064400000000000000000000016411046102023000150710ustar 00000000000000use crate::error::{Error, Result}; use crate::iter::Iter; use crate::token; use proc_macro::Group; #[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord)] pub struct Release { pub minor: u16, pub patch: Option, } pub fn parse(paren: Group, iter: Iter) -> Result { try_parse(iter).map_err(|_| Error::group(paren, "expected rustc release number, like 1.31")) } fn try_parse(iter: Iter) -> Result { let major_minor = token::parse_literal(iter).map_err(drop)?; let string = major_minor.to_string(); if !string.starts_with("1.") { return Err(()); } let minor: u16 = string[2..].parse().map_err(drop)?; let patch = if token::parse_optional_punct(iter, '.').is_some() { let int = token::parse_literal(iter).map_err(drop)?; Some(int.to_string().parse().map_err(drop)?) } else { None }; Ok(Release { minor, patch }) } rustversion-1.0.14/src/time.rs000064400000000000000000000026001046102023000144030ustar 00000000000000use crate::date::Date; use std::env; use std::time::{SystemTime, UNIX_EPOCH}; // Timestamp of 2016-03-01 00:00:00 in UTC. const BASE: u64 = 1456790400; const BASE_YEAR: u16 = 2016; const BASE_MONTH: u8 = 3; // Days between leap days. const CYCLE: u64 = 365 * 4 + 1; const DAYS_BY_MONTH: [u8; 12] = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]; pub fn today() -> Date { let default = Date { year: 2020, month: 2, day: 25, }; try_today().unwrap_or(default) } fn try_today() -> Option { if let Some(pkg_name) = env::var_os("CARGO_PKG_NAME") { if pkg_name.to_str() == Some("rustversion-tests") { return None; // Stable date for ui testing. } } let now = SystemTime::now(); let since_epoch = now.duration_since(UNIX_EPOCH).ok()?; let secs = since_epoch.as_secs(); let approx_days = secs.checked_sub(BASE)? / 60 / 60 / 24; let cycle = approx_days / CYCLE; let mut rem = approx_days % CYCLE; let mut year = BASE_YEAR + cycle as u16 * 4; let mut month = BASE_MONTH; loop { let days_in_month = DAYS_BY_MONTH[month as usize - 1]; if rem < days_in_month as u64 { let day = rem as u8 + 1; return Some(Date { year, month, day }); } rem -= days_in_month as u64; year += (month == 12) as u16; month = month % 12 + 1; } } rustversion-1.0.14/src/token.rs000064400000000000000000000046121046102023000145720ustar 00000000000000use crate::error::{Error, Result}; use crate::iter::Iter; use proc_macro::{Delimiter, Group, Ident, Literal, Span, TokenTree}; pub fn parse_punct(iter: Iter, ch: char) -> Result<()> { match iter.next() { Some(TokenTree::Punct(ref punct)) if punct.as_char() == ch => Ok(()), unexpected => { let span = unexpected .as_ref() .map_or_else(Span::call_site, TokenTree::span); Err(Error::new(span, format!("expected `{}`", ch))) } } } pub fn parse_optional_punct(iter: Iter, ch: char) -> Option<()> { match iter.peek() { Some(TokenTree::Punct(punct)) if punct.as_char() == ch => iter.next().map(drop), _ => None, } } pub fn parse_optional_keyword(iter: Iter, keyword: &str) -> Option { match iter.peek() { Some(TokenTree::Ident(ident)) if ident.to_string() == keyword => { Some(iter.next().unwrap().span()) } _ => None, } } pub fn parse_literal(iter: Iter) -> Result { match iter.next() { Some(TokenTree::Literal(literal)) => Ok(literal), unexpected => { let span = unexpected .as_ref() .map_or_else(Span::call_site, TokenTree::span); Err(Error::new(span, "expected literal")) } } } pub fn parse_paren(introducer: &Ident, iter: Iter) -> Result { match iter.peek() { Some(TokenTree::Group(group)) if group.delimiter() == Delimiter::Parenthesis => { match iter.next() { Some(TokenTree::Group(group)) => Ok(group), _ => unreachable!(), } } Some(unexpected) => Err(Error::new(unexpected.span(), "expected `(`")), None => Err(Error::new( introducer.span(), format!("expected `(` after `{}`", introducer), )), } } pub fn parse_optional_paren(iter: Iter) -> Option { match iter.peek() { Some(TokenTree::Group(group)) if group.delimiter() == Delimiter::Parenthesis => { match iter.next() { Some(TokenTree::Group(group)) => Some(group), _ => unreachable!(), } } _ => None, } } pub fn parse_end(iter: Iter) -> Result<()> { match iter.next() { None => Ok(()), Some(unexpected) => Err(Error::new(unexpected.span(), "unexpected token")), } } rustversion-1.0.14/src/version.rs000064400000000000000000000004411046102023000151330ustar 00000000000000#![allow(dead_code)] use crate::date::Date; #[derive(Copy, Clone, Debug, PartialEq)] pub struct Version { pub minor: u16, pub patch: u16, pub channel: Channel, } #[derive(Copy, Clone, Debug, PartialEq)] pub enum Channel { Stable, Beta, Nightly(Date), Dev, } rustversion-1.0.14/tests/compiletest.rs000064400000000000000000000002461046102023000163540ustar 00000000000000#[rustversion::attr(not(nightly), ignore)] #[cfg_attr(miri, ignore)] #[test] fn ui() { let t = trybuild::TestCases::new(); t.compile_fail("tests/ui/*.rs"); } rustversion-1.0.14/tests/test_const.rs000064400000000000000000000014401046102023000162060ustar 00000000000000#![allow(clippy::semicolon_if_nothing_returned)] // https://github.com/rust-lang/rust-clippy/issues/7324 #[rustversion::attr(all(), const)] fn _basic() {} const _BASIC: () = _basic(); #[rustversion::attr(all(), const)] unsafe fn _unsafe() {} const _UNSAFE: () = unsafe { _unsafe() }; macro_rules! item { ($i:item) => { #[rustversion::attr(all(), const)] $i }; } item! {fn _item() {}} const _ITEM: () = _item(); macro_rules! ident { ($fn:ident) => { #[rustversion::attr(all(), const)] $fn _ident() {} }; } ident! {fn} const _IDENT: () = _ident(); #[rustversion::attr(all(), const)] /// doc fn _doc_below() {} const _DOC_BELOW: () = _doc_below(); /// doc #[rustversion::attr(all(), const)] fn _doc_above() {} const _DOC_ABOVE: () = _doc_above(); rustversion-1.0.14/tests/test_eval.rs000064400000000000000000000004631046102023000160130ustar 00000000000000#[rustversion::any( stable, stable(1.34), stable(1.34.0), beta, nightly, nightly(2020-02-25), since(1.34), since(2020-02-25), before(1.34), before(2020-02-25), not(nightly), all(stable, beta, nightly), )] fn success() {} #[test] fn test() { success(); } rustversion-1.0.14/tests/test_parse.rs000064400000000000000000000047321046102023000162010ustar 00000000000000#![allow( clippy::derive_partial_eq_without_eq, clippy::enum_glob_use, clippy::must_use_candidate )] include!("../build/rustc.rs"); #[test] fn test_parse() { let cases = &[ ( "rustc 1.0.0 (a59de37e9 2015-05-13) (built 2015-05-14)", Version { minor: 0, patch: 0, channel: Stable, }, ), ( "rustc 1.18.0", Version { minor: 18, patch: 0, channel: Stable, }, ), ( "rustc 1.24.1 (d3ae9a9e0 2018-02-27)", Version { minor: 24, patch: 1, channel: Stable, }, ), ( "rustc 1.35.0-beta.3 (c13114dc8 2019-04-27)", Version { minor: 35, patch: 0, channel: Beta, }, ), ( "rustc 1.36.0-nightly (938d4ffe1 2019-04-27)", Version { minor: 36, patch: 0, channel: Nightly(Date { year: 2019, month: 4, day: 27, }), }, ), ( "rustc 1.36.0-dev", Version { minor: 36, patch: 0, channel: Dev, }, ), ( "rustc 1.36.0-nightly", Version { minor: 36, patch: 0, channel: Dev, }, ), ( "warning: invalid logging spec 'warning', ignoring it rustc 1.30.0-nightly (3bc2ca7e4 2018-09-20)", Version { minor: 30, patch: 0, channel: Nightly(Date { year: 2018, month: 9, day: 20, }), }, ), ( "rustc 1.52.1-nightly (gentoo)", Version { minor: 52, patch: 1, channel: Dev, }, ), ]; for (string, expected) in cases { match parse(string) { ParseResult::Success(version) => assert_eq!(version, *expected), ParseResult::OopsClippy | ParseResult::Unrecognized => { panic!("unrecognized: {:?}", string); } } } } rustversion-1.0.14/tests/ui/bad-bound.rs000064400000000000000000000001441046102023000162710ustar 00000000000000#[rustversion::since(stable)] struct S; #[rustversion::any(since(stable))] struct S; fn main() {} rustversion-1.0.14/tests/ui/bad-bound.stderr000064400000000000000000000005661046102023000171600ustar 00000000000000error: expected rustc release number like 1.31, or nightly date like 2020-02-25 --> tests/ui/bad-bound.rs:1:22 | 1 | #[rustversion::since(stable)] | ^^^^^^ error: expected rustc release number like 1.31, or nightly date like 2020-02-25 --> tests/ui/bad-bound.rs:4:26 | 4 | #[rustversion::any(since(stable))] | ^^^^^^ rustversion-1.0.14/tests/ui/bad-date.rs000064400000000000000000000001501046102023000160740ustar 00000000000000#[rustversion::nightly(stable)] struct S; #[rustversion::any(nightly(stable))] struct S; fn main() {} rustversion-1.0.14/tests/ui/bad-date.stderr000064400000000000000000000004701046102023000167600ustar 00000000000000error: expected nightly date, like 2020-02-25 --> tests/ui/bad-date.rs:1:24 | 1 | #[rustversion::nightly(stable)] | ^^^^^^ error: expected nightly date, like 2020-02-25 --> tests/ui/bad-date.rs:4:28 | 4 | #[rustversion::any(nightly(stable))] | ^^^^^^ rustversion-1.0.14/tests/ui/bad-not.rs000064400000000000000000000001321046102023000157570ustar 00000000000000#[rustversion::any(not)] struct S; #[rustversion::any(not, not)] struct S; fn main() {} rustversion-1.0.14/tests/ui/bad-not.stderr000064400000000000000000000003571046102023000166470ustar 00000000000000error: expected `(` after `not` --> tests/ui/bad-not.rs:1:20 | 1 | #[rustversion::any(not)] | ^^^ error: expected `(` --> tests/ui/bad-not.rs:4:23 | 4 | #[rustversion::any(not, not)] | ^ rustversion-1.0.14/tests/ui/bad-version.rs000064400000000000000000000001501046102023000166440ustar 00000000000000#[rustversion::stable(nightly)] struct S; #[rustversion::any(stable(nightly))] struct S; fn main() {} rustversion-1.0.14/tests/ui/bad-version.stderr000064400000000000000000000005021046102023000175240ustar 00000000000000error: expected rustc release number, like 1.31 --> tests/ui/bad-version.rs:1:23 | 1 | #[rustversion::stable(nightly)] | ^^^^^^^ error: expected rustc release number, like 1.31 --> tests/ui/bad-version.rs:4:27 | 4 | #[rustversion::any(stable(nightly))] | ^^^^^^^ rustversion-1.0.14/tests/ui/const-not-fn.rs000064400000000000000000000000771046102023000167700ustar 00000000000000#[rustversion::attr(all(), const)] pub struct S; fn main() {} rustversion-1.0.14/tests/ui/const-not-fn.stderr000064400000000000000000000002241046102023000176410ustar 00000000000000error: only allowed on a fn item --> tests/ui/const-not-fn.rs:1:28 | 1 | #[rustversion::attr(all(), const)] | ^^^^^