31 lines
1.0 KiB
Rust
31 lines
1.0 KiB
Rust
use proc_macro::TokenStream;
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use quote::quote;
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use syn::{parse_macro_input, parse_quote, ItemTrait};
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/// Attribute to use `Send + Sync` for everything but wasm32
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#[proc_macro_attribute]
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pub fn send_sync(_attr: TokenStream, input: TokenStream) -> TokenStream {
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// Parse the input tokens into a syntax tree
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let mut input = parse_macro_input!(input as ItemTrait);
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let send_trait_bound = parse_quote!(std::marker::Send);
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let sync_trait_bound = parse_quote!(std::marker::Sync);
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input.supertraits.push(send_trait_bound);
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input.supertraits.push(sync_trait_bound);
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TokenStream::from(quote!(#input))
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}
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/// A wasm32 compatible wrapper for the async_trait::async_trait macro
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#[proc_macro_attribute]
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pub fn async_trait(_attr: TokenStream, item: TokenStream) -> TokenStream {
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let attrs = r#"
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#[cfg_attr(target_arch = "wasm32", async_trait::async_trait(?Send))]
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#[cfg_attr(not(target_arch = "wasm32"), async_trait::async_trait)]
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"#;
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let mut out: TokenStream = attrs.parse().unwrap();
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out.extend(item);
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out
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}
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