From 698f8c2f01ea549d77d7dc3338a12e04c11057b9 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Wed, 17 Apr 2024 14:02:58 +0200 Subject: Adding upstream version 1.64.0+dfsg1. Signed-off-by: Daniel Baumann --- vendor/rustversion/src/attr.rs | 35 +++++ vendor/rustversion/src/bound.rs | 63 ++++++++ vendor/rustversion/src/constfn.rs | 58 ++++++++ vendor/rustversion/src/date.rs | 50 +++++++ vendor/rustversion/src/error.rs | 56 +++++++ vendor/rustversion/src/expr.rs | 163 +++++++++++++++++++++ vendor/rustversion/src/iter.rs | 42 ++++++ vendor/rustversion/src/lib.rs | 297 ++++++++++++++++++++++++++++++++++++++ vendor/rustversion/src/release.rs | 34 +++++ vendor/rustversion/src/time.rs | 51 +++++++ vendor/rustversion/src/token.rs | 78 ++++++++++ vendor/rustversion/src/version.rs | 18 +++ 12 files changed, 945 insertions(+) create mode 100644 vendor/rustversion/src/attr.rs create mode 100644 vendor/rustversion/src/bound.rs create mode 100644 vendor/rustversion/src/constfn.rs create mode 100644 vendor/rustversion/src/date.rs create mode 100644 vendor/rustversion/src/error.rs create mode 100644 vendor/rustversion/src/expr.rs create mode 100644 vendor/rustversion/src/iter.rs create mode 100644 vendor/rustversion/src/lib.rs create mode 100644 vendor/rustversion/src/release.rs create mode 100644 vendor/rustversion/src/time.rs create mode 100644 vendor/rustversion/src/token.rs create mode 100644 vendor/rustversion/src/version.rs (limited to 'vendor/rustversion/src') diff --git a/vendor/rustversion/src/attr.rs b/vendor/rustversion/src/attr.rs new file mode 100644 index 000000000..6023d1eaf --- /dev/null +++ b/vendor/rustversion/src/attr.rs @@ -0,0 +1,35 @@ +use 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 }) +} diff --git a/vendor/rustversion/src/bound.rs b/vendor/rustversion/src/bound.rs new file mode 100644 index 000000000..a667a5b0d --- /dev/null +++ b/vendor/rustversion/src/bound.rs @@ -0,0 +1,63 @@ +use 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)) + } + } + } +} diff --git a/vendor/rustversion/src/constfn.rs b/vendor/rustversion/src/constfn.rs new file mode 100644 index 000000000..0e50c0396 --- /dev/null +++ b/vendor/rustversion/src/constfn.rs @@ -0,0 +1,58 @@ +use 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")) +} diff --git a/vendor/rustversion/src/date.rs b/vendor/rustversion/src/date.rs new file mode 100644 index 000000000..5cdb691da --- /dev/null +++ b/vendor/rustversion/src/date.rs @@ -0,0 +1,50 @@ +use 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, + }) +} diff --git a/vendor/rustversion/src/error.rs b/vendor/rustversion/src/error.rs new file mode 100644 index 000000000..a99625b4a --- /dev/null +++ b/vendor/rustversion/src/error.rs @@ -0,0 +1,56 @@ +use 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 + }), + ]) + } +} diff --git a/vendor/rustversion/src/expr.rs b/vendor/rustversion/src/expr.rs new file mode 100644 index 000000000..45ed7d215 --- /dev/null +++ b/vendor/rustversion/src/expr.rs @@ -0,0 +1,163 @@ +use 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) +} diff --git a/vendor/rustversion/src/iter.rs b/vendor/rustversion/src/iter.rs new file mode 100644 index 000000000..722013c7d --- /dev/null +++ b/vendor/rustversion/src/iter.rs @@ -0,0 +1,42 @@ +use 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), + } + } + } +} diff --git a/vendor/rustversion/src/lib.rs b/vendor/rustversion/src/lib.rs new file mode 100644 index 000000000..172eb8938 --- /dev/null +++ b/vendor/rustversion/src/lib.rs @@ -0,0 +1,297 @@ +//! [![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&logoColor=white&logo=data:image/svg+xml;base64,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 +//! +//!
+//! +//! 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 +//! } +//! ``` +//! +//!
+ +#![allow( + clippy::cast_lossless, + clippy::cast_possible_truncation, + clippy::doc_markdown, + clippy::enum_glob_use, + clippy::from_iter_instead_of_collect, + 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 expr; +mod iter; +mod release; +mod time; +mod token; +mod version; + +use crate::attr::Then; +use crate::error::{Error, Result}; +use crate::version::Version; +use proc_macro::{Delimiter, Group, Ident, Punct, Spacing, Span, TokenStream, TokenTree}; +use std::iter::FromIterator; + +const RUSTVERSION: Version = include!(concat!(env!("OUT_DIR"), "/version.rs")); + +#[proc_macro_attribute] +pub fn stable(args: TokenStream, input: TokenStream) -> TokenStream { + cfg("stable", args, input) +} + +#[proc_macro_attribute] +pub fn beta(args: TokenStream, input: TokenStream) -> TokenStream { + cfg("beta", args, input) +} + +#[proc_macro_attribute] +pub fn nightly(args: TokenStream, input: TokenStream) -> TokenStream { + cfg("nightly", args, input) +} + +#[proc_macro_attribute] +pub fn since(args: TokenStream, input: TokenStream) -> TokenStream { + cfg("since", args, input) +} + +#[proc_macro_attribute] +pub fn before(args: TokenStream, input: TokenStream) -> TokenStream { + cfg("before", args, input) +} + +#[proc_macro_attribute] +pub fn not(args: TokenStream, input: TokenStream) -> TokenStream { + cfg("not", args, input) +} + +#[proc_macro_attribute] +pub fn any(args: TokenStream, input: TokenStream) -> TokenStream { + cfg("any", args, input) +} + +#[proc_macro_attribute] +pub fn all(args: TokenStream, input: TokenStream) -> TokenStream { + cfg("all", args, input) +} + +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(RUSTVERSION) { + Ok(input) + } else { + Ok(TokenStream::new()) + } +} + +#[proc_macro_attribute] +pub fn attr(args: TokenStream, input: TokenStream) -> TokenStream { + attr::parse(args) + .and_then(|args| try_attr(args, input)) + .unwrap_or_else(Error::into_compile_error) +} + +fn try_attr(args: attr::Args, input: TokenStream) -> Result { + if !args.condition.eval(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), + )) + } + } +} diff --git a/vendor/rustversion/src/release.rs b/vendor/rustversion/src/release.rs new file mode 100644 index 000000000..3f421c657 --- /dev/null +++ b/vendor/rustversion/src/release.rs @@ -0,0 +1,34 @@ +use 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 }) +} diff --git a/vendor/rustversion/src/time.rs b/vendor/rustversion/src/time.rs new file mode 100644 index 000000000..3c21463dd --- /dev/null +++ b/vendor/rustversion/src/time.rs @@ -0,0 +1,51 @@ +use 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; + } +} diff --git a/vendor/rustversion/src/token.rs b/vendor/rustversion/src/token.rs new file mode 100644 index 000000000..ebb6f1c01 --- /dev/null +++ b/vendor/rustversion/src/token.rs @@ -0,0 +1,78 @@ +use 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")), + } +} diff --git a/vendor/rustversion/src/version.rs b/vendor/rustversion/src/version.rs new file mode 100644 index 000000000..f4a69f518 --- /dev/null +++ b/vendor/rustversion/src/version.rs @@ -0,0 +1,18 @@ +#![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, +} -- cgit v1.2.3