darling_core/codegen/
error.rs

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1use proc_macro2::TokenStream;
2use quote::{quote, ToTokens, TokenStreamExt};
3
4/// Declares the local variable into which errors will be accumulated.
5#[derive(Default)]
6pub struct ErrorDeclaration {
7    __hidden: (),
8}
9
10impl ToTokens for ErrorDeclaration {
11    fn to_tokens(&self, tokens: &mut TokenStream) {
12        tokens.append_all(quote! {
13            let mut __errors = ::darling::Error::accumulator();
14        })
15    }
16}
17
18/// Returns early if attribute or body parsing has caused any errors.
19#[derive(Default)]
20pub struct ErrorCheck<'a> {
21    location: Option<&'a str>,
22    __hidden: (),
23}
24
25impl<'a> ErrorCheck<'a> {
26    pub fn with_location(location: &'a str) -> Self {
27        ErrorCheck {
28            location: Some(location),
29            __hidden: (),
30        }
31    }
32}
33
34impl<'a> ToTokens for ErrorCheck<'a> {
35    fn to_tokens(&self, tokens: &mut TokenStream) {
36        let at_call = if let Some(ref s) = self.location {
37            quote!(.map_err(|e| e.at(#s)))
38        } else {
39            quote!()
40        };
41
42        tokens.append_all(quote! {
43            __errors.finish() #at_call?;
44        })
45    }
46}
darling_core/codegen/error.rs

darling_core/codegen/
error.rs
