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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 09:22:09 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 09:22:09 +0000 |
commit | 43a97878ce14b72f0981164f87f2e35e14151312 (patch) | |
tree | 620249daf56c0258faa40cbdcf9cfba06de2a846 /third_party/rust/rustversion/src/expr.rs | |
parent | Initial commit. (diff) | |
download | firefox-43a97878ce14b72f0981164f87f2e35e14151312.tar.xz firefox-43a97878ce14b72f0981164f87f2e35e14151312.zip |
Adding upstream version 110.0.1.upstream/110.0.1upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'third_party/rust/rustversion/src/expr.rs')
-rw-r--r-- | third_party/rust/rustversion/src/expr.rs | 163 |
1 files changed, 163 insertions, 0 deletions
diff --git a/third_party/rust/rustversion/src/expr.rs b/third_party/rust/rustversion/src/expr.rs new file mode 100644 index 0000000000..45ed7d2156 --- /dev/null +++ b/third_party/rust/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<Expr>), + Any(Vec<Expr>), + All(Vec<Expr>), +} + +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<Expr> { + 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<Expr> { + 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<Expr> { + 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<Expr> { + 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<Expr> { + 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<Expr> { + 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<Expr> { + 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<Expr> { + 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<Vec<Expr>> { + 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) +} |