https://github.com/sergiobenitez/proc-macro2-diagnostics
Diagnostics for stable and nightly proc-macros!
https://github.com/sergiobenitez/proc-macro2-diagnostics
Last synced: 4 months ago
JSON representation
Diagnostics for stable and nightly proc-macros!
- Host: GitHub
- URL: https://github.com/sergiobenitez/proc-macro2-diagnostics
- Owner: SergioBenitez
- License: apache-2.0
- Created: 2019-09-19T23:38:22.000Z (over 5 years ago)
- Default Branch: master
- Last Pushed: 2024-03-13T07:51:42.000Z (over 1 year ago)
- Last Synced: 2025-01-29T19:46:40.083Z (5 months ago)
- Language: Rust
- Size: 37.1 KB
- Stars: 10
- Watchers: 5
- Forks: 5
- Open Issues: 6
-
Metadata Files:
- Readme: README.md
- License: LICENSE-APACHE
Awesome Lists containing this project
README
# proc-macro2-diagnostics [![crates.io]][crate] [![docs.rs]][docs]
[crates.io]: https://img.shields.io/crates/v/proc-macro2-diagnostics.svg
[crate]: https://crates.io/crates/proc-macro2-diagnostics
[docs.rs]: https://docs.rs/proc-macro2-diagnostics/badge.svg
[docs]: https://docs.rs/proc-macro2-diagnostics
Diagnostics for stable and nightly proc-macros!
## Usage
1. Depend on the library in your proc-macro.
```toml
[dependencies]
proc-macro2-diagnostics = "0.10"
```
2. Import `SpanDiagnosticExt` and use its methods on a `proc_macro2::Span` to
create `Diagnostic`s:
```rust
use syn::spanned::Spanned;
use proc_macro2::TokenStream;
use proc_macro2_diagnostics::{SpanDiagnosticExt, Diagnostic};
fn my_macro(input: TokenStream) -> Result {
Err(input.span().error("there's a problem here..."))
}
```
3. If there's an error, emit the diagnostic as tokens:
```rust
extern crate proc_macro;
pub fn real_macro(tokens: proc_macro::TokenStream) -> proc_macro::TokenStream {
match my_macro(tokens.into()) {
Ok(tokens) => tokens.into(),
Err(diag) => diag.emit_as_expr_tokens().into()
}
}
```
This does the right thing on nightly _or_ stable.
### Caveats
On stable, due to limitations, any top-level, non-error diagnostics are
emitted as errors. This will abort compilation. To avoid this, you may want
to `cfg`-gate emitting non-error diagnostics to nightly.
### Colors
By default, error messages are colored on stable. To disable, disable
default features:
```toml
[dependencies]
proc-macro2-diagnostics = { version = "0.10", default-features = false }
```
The compiler always colors diagnostics on nightly.
## License
Licensed under either of the following, at your option:
* Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
* MIT License ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)