173c0e5ac5
The `data` crate is intended to be used as the manifest serialization
and deserialization format.
This blog post describes the motivation and goals for this crate:
https://rodarmor.com/blog/data
type: added
29 lines
780 B
Rust
29 lines
780 B
Rust
use crate::common::*;
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pub(crate) trait Attribute: FromMeta {
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type Item: syn::parse::Parse;
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fn attribute(
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attr: proc_macro::TokenStream,
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item: proc_macro::TokenStream,
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) -> proc_macro::TokenStream {
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Self::inner(attr.into(), item.into()).tokens().into()
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}
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fn inner(attr: TokenStream, item: TokenStream) -> Result<TokenStream, Error> {
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let args = Punctuated::<NestedMeta, token::Comma>::parse_terminated
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.parse2(attr)?
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.into_iter()
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.collect();
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Self::innermost(args, item)
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}
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fn innermost(args: Vec<NestedMeta>, item: TokenStream) -> Result<TokenStream, Error> {
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let item = syn::parse2::<Self::Item>(item)?;
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Self::from_list(&args)?.expand(item)
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}
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fn expand(&self, item: Self::Item) -> Result<TokenStream, Error>;
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}
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