这篇文章主要讲解了“Rust的proc-macro-error怎么使用”,文中的讲解内容简单清晰,易于学习与理解,下面请大家跟着小编的思路慢慢深入,一起来研究和学习“Rust的proc-macro-error怎么使用”吧!
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use proc_macro_error::*;
use proc_macro::TokenStream;
use syn::{spanned::Spanned, DeriveInput, ItemStruct, Fields, Attribute , parse_macro_input};
use quote::quote;
fn process_attrs(attrs: &[Attribute]) -> Vec
{ attrs
.iter()
.filter_map(|attr| match process_attr(attr) {
Ok(res) => Some(res),
Err(msg) => {
emit_error!(attr, "Invalid attribute: {}", msg);
None
}
})
.collect()
}
fn process_fields(_attrs: &Fields) -> Vec
{ // processing fields in pretty much the same way as attributes
unimplemented!()
}
#[proc_macro]
#[proc_macro_error]
pub fn make_answer(input: TokenStream) -> TokenStream {
let input = parse_macro_input!(input as ItemStruct);
let attrs = process_attrs(&input.attrs);
// abort right now if some errors were encountered
// at the attributes processing stage
abort_if_dirty();
let fields = process_fields(&input.fields);
// no need to think about emitted errors
// #[proc_macro_error] will handle them for you
//
// just return a TokenStream as you normally would
quote!(/* stuff */).into()
}
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