| 1 | |
| 2 |
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| 3 | use std::fmt::Display;
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| 4 |
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| 5 | use proc_macro2::TokenStream;
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| 6 | use quote::quote_spanned;
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| 7 | use syn::{spanned::Spanned, Error};
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| 8 |
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| 9 | pub(crate) struct DiagCtxt(TokenStream);
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| 10 | pub(crate) struct ErrorGuaranteed(());
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| 11 |
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| 12 | impl DiagCtxt {
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| 13 | pub(crate) fn error(&mut self, span: impl Spanned, msg: impl Display) -> ErrorGuaranteed {
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| 14 | let error = Error::new(span.span(), msg);
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| 15 | self.0.extend(error.into_compile_error());
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| 16 | ErrorGuaranteed(())
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| 17 | }
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| 18 |
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| 19 | pub(crate) fn warn(&mut self, span: impl Spanned, msg: impl Display) {
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| 20 | |
| 21 | let msg = format!("\n{}", msg);
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| 22 | self.0.extend(quote_spanned!(span.span() =>
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| 23 | |
| 24 | const _: () = {
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| 25 | #[deprecated = #msg]
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| 26 | const fn warn() {}
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| 27 | warn();
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| 28 | };
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| 29 | ));
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| 30 | }
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| 31 |
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| 32 | pub(crate) fn with(
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| 33 | fun: impl FnOnce(&mut DiagCtxt) -> Result<TokenStream, ErrorGuaranteed>,
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| 34 | ) -> TokenStream {
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| 35 | let mut dcx = Self(TokenStream::new());
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| 36 | match fun(&mut dcx) {
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| 37 | Ok(mut stream) => {
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| 38 | stream.extend(dcx.0);
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| 39 | stream
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| 40 | }
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| 41 | Err(ErrorGuaranteed(())) => dcx.0,
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| 42 | }
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| 43 | }
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| 44 | }
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