diff options
Diffstat (limited to 'src/lib.rs')
| -rw-r--r-- | src/lib.rs | 103 |
1 files changed, 93 insertions, 10 deletions
@@ -2,7 +2,7 @@ //! //! [github]: https://img.shields.io/badge/github-8da0cb?style=for-the-badge&labelColor=555555&logo=github //! [crates-io]: https://img.shields.io/badge/crates.io-fc8d62?style=for-the-badge&labelColor=555555&logo=rust -//! [docs-rs]: https://img.shields.io/badge/docs.rs-66c2a5?style=for-the-badge&labelColor=555555&logoColor=white&logo=data:image/svg+xml;base64,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 +//! [docs-rs]: https://img.shields.io/badge/docs.rs-66c2a5?style=for-the-badge&labelColor=555555&logo=docs.rs //! //! <br> //! @@ -119,31 +119,110 @@ //! [Kixunil]: https://github.com/Kixunil //! [`dont_panic`]: https://github.com/Kixunil/dont_panic +#![doc(html_root_url = "https://docs.rs/no-panic/0.1.21")] +#![allow( + clippy::doc_markdown, + clippy::match_same_arms, + clippy::missing_panics_doc +)] +#![cfg_attr(all(test, exhaustive), feature(non_exhaustive_omitted_patterns_lint))] + extern crate proc_macro; use proc_macro::TokenStream; -use proc_macro2::Span; +use proc_macro2::{Span, TokenStream as TokenStream2}; use quote::quote; -use syn::{parse_macro_input, parse_quote, Attribute, FnArg, Ident, ItemFn, PatType, ReturnType}; +use syn::parse::{Error, Nothing, Result}; +use syn::{ + parse_quote, Attribute, FnArg, GenericArgument, Ident, ItemFn, Pat, PatType, Path, + PathArguments, ReturnType, Token, Type, TypeInfer, TypeParamBound, +}; #[proc_macro_attribute] -pub fn no_panic(args: TokenStream, function: TokenStream) -> TokenStream { - assert!(args.is_empty()); +pub fn no_panic(args: TokenStream, input: TokenStream) -> TokenStream { + let args = TokenStream2::from(args); + let input = TokenStream2::from(input); + let expanded = match parse(args, input.clone()) { + Ok(function) => expand_no_panic(function), + Err(parse_error) => { + let compile_error = parse_error.to_compile_error(); + quote!(#compile_error #input) + } + }; + TokenStream::from(expanded) +} + +fn parse(args: TokenStream2, input: TokenStream2) -> Result<ItemFn> { + let function: ItemFn = syn::parse2(input)?; + let _: Nothing = syn::parse2::<Nothing>(args)?; + if function.sig.asyncness.is_some() { + return Err(Error::new( + Span::call_site(), + "no_panic attribute on async fn is not supported", + )); + } + Ok(function) +} + +// Convert `Path<impl Trait>` to `Path<_>` +fn make_impl_trait_wild(ret: &mut Type) { + match ret { + Type::ImplTrait(impl_trait) => { + *ret = Type::Infer(TypeInfer { + underscore_token: Token, + }); + } + Type::Array(ret) => make_impl_trait_wild(&mut ret.elem), + Type::Group(ret) => make_impl_trait_wild(&mut ret.elem), + Type::Paren(ret) => make_impl_trait_wild(&mut ret.elem), + Type::Path(ret) => make_impl_trait_wild_in_path(&mut ret.path), + Type::Ptr(ret) => make_impl_trait_wild(&mut ret.elem), + Type::Reference(ret) => make_impl_trait_wild(&mut ret.elem), + Type::Slice(ret) => make_impl_trait_wild(&mut ret.elem), + Type::TraitObject(ret) => { + for bound in &mut ret.bounds { + if let TypeParamBound::Trait(bound) = bound { + make_impl_trait_wild_in_path(&mut bound.path); + } + } + } + Type::Tuple(ret) => ret.elems.iter_mut().for_each(make_impl_trait_wild), + Type::BareFn(_) | Type::Infer(_) | Type::Macro(_) | Type::Never(_) | Type::Verbatim(_) => {} + #[cfg_attr(all(test, exhaustive), deny(non_exhaustive_omitted_patterns))] + _ => {} + } +} - let mut function = parse_macro_input!(function as ItemFn); +fn make_impl_trait_wild_in_path(path: &mut Path) { + for segment in &mut path.segments { + if let PathArguments::AngleBracketed(bracketed) = &mut segment.arguments { + for arg in &mut bracketed.args { + if let GenericArgument::Type(arg) = arg { + make_impl_trait_wild(arg); + } + } + } + } +} +fn expand_no_panic(mut function: ItemFn) -> TokenStream2 { let mut move_self = None; let mut arg_pat = Vec::new(); let mut arg_val = Vec::new(); for (i, input) in function.sig.inputs.iter_mut().enumerate() { let numbered = Ident::new(&format!("__arg{}", i), Span::call_site()); match input { - FnArg::Typed(PatType { pat, .. }) => { + FnArg::Typed(PatType { pat, .. }) + if match pat.as_ref() { + Pat::Ident(pat) => pat.ident != "self", + _ => true, + } => + { arg_pat.push(quote!(#pat)); arg_val.push(quote!(#numbered)); *pat = parse_quote!(mut #numbered); } - FnArg::Receiver(_) => { + FnArg::Typed(_) | FnArg::Receiver(_) => { move_self = Some(quote! { if false { loop {} @@ -168,7 +247,11 @@ pub fn no_panic(args: TokenStream, function: TokenStream) -> TokenStream { let ret = match &function.sig.output { ReturnType::Default => quote!(-> ()), - output @ ReturnType::Type(..) => quote!(#output), + ReturnType::Type(arrow, output) => { + let mut output = output.clone(); + make_impl_trait_wild(&mut output); + quote!(#arrow #output) + } }; let stmts = function.block.stmts; let message = format!( @@ -200,5 +283,5 @@ pub fn no_panic(args: TokenStream, function: TokenStream) -> TokenStream { __result })); - TokenStream::from(quote!(#function)) + quote!(#function) } |