bendns' repos / rust-analyzer
Unnamed repository; edit this file 'description' to name the repository. 
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elf.by_key(sym::rustc_builtin_macro).tt_values().next()?; parse_macro_name_and_helper_attrs(derive) } } // This fn is intended for `#[proc_macro_derive(..)]` and `#[rustc_builtin_macro(..)]`, which have // the same structure. #[rustfmt::skip] pub(crate) fn parse_macro_name_and_helper_attrs(tt: &TopSubtree) -> Option<(Name, Box<[Name]>)> { match tt.token_trees().flat_tokens() { // `#[proc_macro_derive(Trait)]` // `#[rustc_builtin_macro(Trait)]` [TokenTree::Leaf(Leaf::Ident(trait_name))] => Some((trait_name.as_name(), Box::new([]))), // `#[proc_macro_derive(Trait, attributes(helper1, helper2, ...))]` // `#[rustc_builtin_macro(Trait, attributes(helper1, helper2, ...))]` [ TokenTree::Leaf(Leaf::Ident(trait_name)), TokenTree::Leaf(Leaf::Punct(comma)), TokenTree::Leaf(Leaf::Ident(attributes)), TokenTree::Subtree(_), .. ] if comma.char == ',' && attributes.sym == sym::attributes => { let helpers = tt::TokenTreesView::new(&tt.token_trees().flat_tokens()[3..]).try_into_subtree()?; let helpers = helpers .iter() .filter( |tt| !matches!(tt, TtElement::Leaf(Leaf::Punct(comma)) if comma.char == ','), ) .map(|tt| match tt { TtElement::Leaf(Leaf::Ident(helper)) => Some(helper.as_name()), _ => None, }) .collect::<Option<Box<[_]>>>()?; Some((trait_name.as_name(), helpers)) } _ => None, } }