linux-kernel - Re: [PATCH 1/3] rust: macros: Make expect

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Date:   Sat, 25 Feb 2023 00:29:18 +0000
From:   Gary Guo <gary@...yguo.net>
To:     Asahi Lina <lina@...hilina.net>
Cc:     Miguel Ojeda <ojeda@...nel.org>,
        Alex Gaynor <alex.gaynor@...il.com>,
        Wedson Almeida Filho <wedsonaf@...il.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Björn Roy Baron <bjorn3_gh@...tonmail.com>,
        rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org,
        asahi@...ts.linux.dev
Subject: Re: [PATCH 1/3] rust: macros: Make expect_punct() return the Punct
 directly

On Fri, 24 Feb 2023 16:25:55 +0900
Asahi Lina <lina@...hilina.net> wrote:

> This makes it mirror the way expect_ident() works, and means we can more
> easily push the result back into the token stream.
> 
> Signed-off-by: Asahi Lina <lina@...hilina.net>

Reviewed-by: Gary Guo <gary@...yguo.net>

> ---
>  rust/macros/concat_idents.rs | 2 +-
>  rust/macros/helpers.rs       | 6 +++---
>  rust/macros/module.rs        | 4 ++--
>  3 files changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/rust/macros/concat_idents.rs b/rust/macros/concat_idents.rs
> index 7e4b450f3a50..6d955d65016e 100644
> --- a/rust/macros/concat_idents.rs
> +++ b/rust/macros/concat_idents.rs
> @@ -15,7 +15,7 @@ fn expect_ident(it: &mut token_stream::IntoIter) -> Ident {
>  pub(crate) fn concat_idents(ts: TokenStream) -> TokenStream {
>      let mut it = ts.into_iter();
>      let a = expect_ident(&mut it);
> -    assert_eq!(expect_punct(&mut it), ',');
> +    assert_eq!(expect_punct(&mut it).as_char(), ',');
>      let b = expect_ident(&mut it);
>      assert!(it.next().is_none(), "only two idents can be concatenated");
>      let res = Ident::new(&format!("{a}{b}"), b.span());
> diff --git a/rust/macros/helpers.rs b/rust/macros/helpers.rs
> index cf7ad950dc1e..65706ecc007e 100644
> --- a/rust/macros/helpers.rs
> +++ b/rust/macros/helpers.rs
> @@ -1,6 +1,6 @@
>  // SPDX-License-Identifier: GPL-2.0
>  
> -use proc_macro::{token_stream, TokenTree};
> +use proc_macro::{token_stream, Punct, TokenTree};
>  
>  pub(crate) fn try_ident(it: &mut token_stream::IntoIter) -> Option<String> {
>      if let Some(TokenTree::Ident(ident)) = it.next() {
> @@ -38,9 +38,9 @@ pub(crate) fn expect_ident(it: &mut token_stream::IntoIter) -> String {
>      try_ident(it).expect("Expected Ident")
>  }
>  
> -pub(crate) fn expect_punct(it: &mut token_stream::IntoIter) -> char {
> +pub(crate) fn expect_punct(it: &mut token_stream::IntoIter) -> Punct {
>      if let TokenTree::Punct(punct) = it.next().expect("Reached end of token stream for Punct") {
> -        punct.as_char()
> +        punct
>      } else {
>          panic!("Expected Punct");
>      }
> diff --git a/rust/macros/module.rs b/rust/macros/module.rs
> index a7e363c2b044..07503b242d2d 100644
> --- a/rust/macros/module.rs
> +++ b/rust/macros/module.rs
> @@ -104,7 +104,7 @@ impl ModuleInfo {
>                  );
>              }
>  
> -            assert_eq!(expect_punct(it), ':');
> +            assert_eq!(expect_punct(it).as_char(), ':');
>  
>              match key.as_str() {
>                  "type" => info.type_ = expect_ident(it),
> @@ -119,7 +119,7 @@ impl ModuleInfo {
>                  ),
>              }
>  
> -            assert_eq!(expect_punct(it), ',');
> +            assert_eq!(expect_punct(it).as_char(), ',');
>  
>              seen_keys.push(key);
>          }
>