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Merge pull request #2 from matteopolak/feat/add-debug-handler
feat: add #[axum_codec::debug_handler]
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,202 @@ | ||
| use proc_macro2::TokenStream; | ||
| use quote::{quote, ToTokens}; | ||
| use syn::{ | ||
| parse::{Parse, ParseStream}, | ||
| punctuated::Punctuated, | ||
| spanned::Spanned, | ||
| Meta, Path, Token, | ||
| }; | ||
|
|
||
| struct Args { | ||
| encode: bool, | ||
| decode: bool, | ||
| crate_name: Path, | ||
| } | ||
|
|
||
| impl Parse for Args { | ||
| fn parse(input: ParseStream) -> syn::Result<Self> { | ||
| let options = Punctuated::<Meta, Token![,]>::parse_terminated(input)?; | ||
|
|
||
| let mut encode = false; | ||
| let mut decode = false; | ||
| let mut crate_name = syn::parse_str("axum_codec").expect("failed to parse crate name"); | ||
|
|
||
| for meta in options { | ||
| match meta { | ||
| Meta::List(list) => { | ||
| return Err(syn::Error::new( | ||
| list.span(), | ||
| "expected `encode`, `decode`, or `crate`", | ||
| )) | ||
| } | ||
| Meta::Path(path) => { | ||
| let ident = path.get_ident().map(|ident| ident.to_string()); | ||
| match ident.as_deref() { | ||
| Some("encode") if encode => { | ||
| return Err(syn::Error::new( | ||
| path.span(), | ||
| "option `encode` is already enabled", | ||
| )) | ||
| } | ||
| Some("decode") if decode => { | ||
| return Err(syn::Error::new( | ||
| path.span(), | ||
| "option `decode` is already enabled", | ||
| )) | ||
| } | ||
| Some("encode") => encode = true, | ||
| Some("decode") => decode = true, | ||
| Some(other) => { | ||
| return Err(syn::Error::new( | ||
| path.span(), | ||
| format!("unknown option `{other}`, expected `encode` or `decode`"), | ||
| )) | ||
| } | ||
| None => { | ||
| return Err(syn::Error::new( | ||
| path.span(), | ||
| "expected `encode` or `decode`", | ||
| )) | ||
| } | ||
| } | ||
| } | ||
| Meta::NameValue(name_value) => { | ||
| if !name_value.path.is_ident("crate") { | ||
| return Err(syn::Error::new(name_value.path.span(), "expected `crate`")); | ||
| } | ||
|
|
||
| let path = match name_value.value { | ||
| syn::Expr::Lit(ref lit) => match &lit.lit { | ||
| syn::Lit::Str(path) => path, | ||
| _ => return Err(syn::Error::new(lit.span(), "expected a string")), | ||
| }, | ||
| _ => { | ||
| return Err(syn::Error::new( | ||
| name_value.value.span(), | ||
| "expected a literal string", | ||
| )) | ||
| } | ||
| }; | ||
|
|
||
| let mut path = syn::parse_str::<Path>(&path.value()).expect("failed to parse path"); | ||
|
|
||
| path.leading_colon = if path.is_ident("crate") { | ||
| None | ||
| } else { | ||
| Some(Token)) | ||
| }; | ||
|
|
||
| crate_name = path; | ||
| } | ||
| } | ||
| } | ||
|
|
||
| if !encode && !decode { | ||
| return Err(syn::Error::new( | ||
| input.span(), | ||
| "at least one of `encode` or `decode` must be enabled", | ||
| )); | ||
| } | ||
|
|
||
| Ok(Self { | ||
| encode, | ||
| decode, | ||
| crate_name, | ||
| }) | ||
| } | ||
| } | ||
|
|
||
| pub fn apply( | ||
| attr: proc_macro::TokenStream, | ||
| input: proc_macro::TokenStream, | ||
| ) -> proc_macro::TokenStream { | ||
| let args = syn::parse_macro_input!(attr as Args); | ||
|
|
||
| let crate_name = &args.crate_name; | ||
| let mut tokens = TokenStream::default(); | ||
|
|
||
| #[cfg(feature = "serde")] | ||
| { | ||
| if args.encode { | ||
| tokens.extend(quote! { | ||
| #[derive(#crate_name::__private::serde::Serialize)] | ||
| }); | ||
| } | ||
|
|
||
| if args.decode { | ||
| tokens.extend(quote! { | ||
| #[derive(#crate_name::__private::serde::Deserialize)] | ||
| }); | ||
| } | ||
|
|
||
| let crate_ = format!("{}::__private::serde", crate_name.to_token_stream()); | ||
|
|
||
| tokens.extend(quote! { | ||
| #[serde(crate = #crate_)] | ||
| }); | ||
| } | ||
|
|
||
| #[cfg(feature = "bincode")] | ||
| { | ||
| if args.encode { | ||
| tokens.extend(quote! { | ||
| #[derive(#crate_name::__private::bincode::Encode)] | ||
| }); | ||
| } | ||
|
|
||
| if args.decode { | ||
| tokens.extend(quote! { | ||
| #[derive(#crate_name::__private::bincode::Decode)] | ||
| }); | ||
| } | ||
|
|
||
| let crate_ = format!("{}::__private::bincode", crate_name.to_token_stream()); | ||
|
|
||
| tokens.extend(quote! { | ||
| #[bincode(crate = #crate_)] | ||
| }); | ||
| } | ||
|
|
||
| #[cfg(feature = "bitcode")] | ||
| { | ||
| if args.encode { | ||
| tokens.extend(quote! { | ||
| #[derive(#crate_name::__private::bitcode::Encode)] | ||
| }); | ||
| } | ||
|
|
||
| if args.decode { | ||
| tokens.extend(quote! { | ||
| #[derive(#crate_name::__private::bitcode::Decode)] | ||
| }); | ||
| } | ||
|
|
||
| let crate_ = format!("{}::__private::bitcode", crate_name.to_token_stream()); | ||
|
|
||
| tokens.extend(quote! { | ||
| #[bitcode(crate = #crate_)] | ||
| }); | ||
| } | ||
|
|
||
| #[cfg(feature = "aide")] | ||
| { | ||
| let crate_ = format!("{}::__private::schemars", crate_name.to_token_stream()); | ||
|
|
||
| tokens.extend(quote! { | ||
| #[derive(#crate_name::__private::schemars::JsonSchema)] | ||
| #[schemars(crate = #crate_)] | ||
| }); | ||
| } | ||
|
|
||
| // TODO: Implement #[validate(crate = "...")] | ||
| // For now, use the real crate name so the error is nicer. | ||
| #[cfg(feature = "validator")] | ||
| if args.decode { | ||
| tokens.extend(quote! { | ||
| #[derive(validator::Validate)] | ||
| }); | ||
| } | ||
|
|
||
| tokens.extend(TokenStream::from(input)); | ||
| tokens.into() | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,60 @@ | ||
| // This is copied from Axum under the following license: | ||
| // | ||
| // Copyright 2021 Axum Contributors | ||
| // | ||
| // Permission is hereby granted, free of charge, to any | ||
| // person obtaining a copy of this software and associated | ||
| // documentation files (the "Software"), to deal in the | ||
| // Software without restriction, including without | ||
| // limitation the rights to use, copy, modify, merge, | ||
| // publish, distribute, sublicense, and/or sell copies of | ||
| // the Software, and to permit persons to whom the Software | ||
| // is furnished to do so, subject to the following | ||
| // conditions: | ||
| // | ||
| // The above copyright notice and this permission notice | ||
| // shall be included in all copies or substantial portions | ||
| // of the Software. | ||
| // | ||
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF | ||
| // ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED | ||
| // TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A | ||
| // PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT | ||
| // SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY | ||
| // CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION | ||
| // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR | ||
| // IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER | ||
| // DEALINGS IN THE SOFTWARE. | ||
|
|
||
| use quote::ToTokens; | ||
| use syn::{ | ||
| parse::{Parse, ParseStream}, | ||
| Token, | ||
| }; | ||
|
|
||
| pub(crate) fn parse_assignment_attribute<K, T>( | ||
| input: ParseStream, | ||
| out: &mut Option<(K, T)>, | ||
| ) -> syn::Result<()> | ||
| where | ||
| K: Parse + ToTokens, | ||
| T: Parse, | ||
| { | ||
| let kw = input.parse()?; | ||
| input.parse::<Token![=]>()?; | ||
| let inner = input.parse()?; | ||
|
|
||
| if out.is_some() { | ||
| let kw_name = std::any::type_name::<K>().split("::").last().unwrap(); | ||
| let msg = format!("`{kw_name}` specified more than once"); | ||
| return Err(syn::Error::new_spanned(kw, msg)); | ||
| } | ||
|
|
||
| *out = Some((kw, inner)); | ||
|
|
||
| Ok(()) | ||
| } | ||
|
|
||
| pub(crate) fn second<T, K>(tuple: (T, K)) -> K { | ||
| tuple.1 | ||
| } |
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