diff options
Diffstat (limited to 'syntax/attrs.rs')
| -rw-r--r-- | syntax/attrs.rs | 25 |
1 files changed, 23 insertions, 2 deletions
diff --git a/syntax/attrs.rs b/syntax/attrs.rs index 4808f2e1..fa6c8097 100644 --- a/syntax/attrs.rs +++ b/syntax/attrs.rs @@ -4,7 +4,7 @@ use crate::syntax::Atom::{self, *}; use crate::syntax::{Derive, Doc, ForeignName}; use proc_macro2::{Ident, TokenStream}; use quote::ToTokens; -use syn::parse::{ParseStream, Parser as _}; +use syn::parse::{Nothing, Parse, ParseStream, Parser as _}; use syn::{Attribute, Error, LitStr, Path, Result, Token}; // Intended usage: @@ -33,6 +33,7 @@ pub struct Parser<'a> { pub namespace: Option<&'a mut Namespace>, pub cxx_name: Option<&'a mut Option<ForeignName>>, pub rust_name: Option<&'a mut Option<Ident>>, + pub variants_from_header: Option<&'a mut Option<Attribute>>, // Suppress clippy needless_update lint ("struct update has no effect, all // the fields in the struct have already been specified") when preemptively @@ -121,6 +122,14 @@ pub fn parse(cx: &mut Errors, attrs: Vec<Attribute>, mut parser: Parser) -> Othe break; } } + } else if attr.path.is_ident("variants_from_header") && cfg!(feature = "experimental") { + if let Err(err) = Nothing::parse.parse2(attr.tokens.clone()) { + cx.push(err); + } + if let Some(variants_from_header) = &mut parser.variants_from_header { + **variants_from_header = Some(attr); + continue; + } } else if attr.path.is_ident("allow") || attr.path.is_ident("warn") || attr.path.is_ident("deny") @@ -224,7 +233,19 @@ impl OtherAttrs { impl ToTokens for OtherAttrs { fn to_tokens(&self, tokens: &mut TokenStream) { for attr in &self.0 { - attr.to_tokens(tokens); + let Attribute { + pound_token, + style, + bracket_token, + path, + tokens: attr_tokens, + } = attr; + pound_token.to_tokens(tokens); + let _ = style; // ignore; render outer and inner attrs both as outer + bracket_token.surround(tokens, |tokens| { + path.to_tokens(tokens); + attr_tokens.to_tokens(tokens); + }); } } } |