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Make proc macros hygienic in bevy_reflect_derive (bevyengine#6752)
# Objective - Fixes bevyengine#3004 ## Solution - Replaced all the types with their fully quallified names - Replaced all trait methods and inherent methods on dyn traits with their fully qualified names - Made a new file `fq_std.rs` that contains structs corresponding to commonly used Structs and Traits from `std`. These structs are replaced by their respective fully qualified names when used inside `quote!`
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,77 @@ | ||
| //! This module contains unit structs that should be used inside `quote!` and `spanned_quote!` using the variable interpolation syntax in place of their equivalent structs and traits present in `std`. | ||
| // | ||
| //! To create hygienic proc macros, all the names must be its fully qualified form. These unit structs help us to not specify the fully qualified name every single time. | ||
| //! | ||
| //! # Example | ||
| //! Instead of writing this: | ||
| //! ```ignore | ||
| //! quote!( | ||
| //! fn get_id() -> Option<i32> { | ||
| //! Some(0) | ||
| //! } | ||
| //! ) | ||
| //! ``` | ||
| //! Or this: | ||
| //! ```ignore | ||
| //! quote!( | ||
| //! fn get_id() -> ::core::option::Option<i32> { | ||
| //! ::core::option::Option::Some(0) | ||
| //! } | ||
| //! ) | ||
| //! ``` | ||
| //! We should write this: | ||
| //! ```ignore | ||
| //! use crate::fq_std::FQOption; | ||
| //! | ||
| //! quote!( | ||
| //! fn get_id() -> #FQOption<i32> { | ||
| //! #FQOption::Some(0) | ||
| //! } | ||
| //! ) | ||
| //! ``` | ||
| use proc_macro2::TokenStream; | ||
| use quote::{quote, ToTokens}; | ||
|
|
||
| pub(crate) struct FQAny; | ||
| pub(crate) struct FQBox; | ||
| pub(crate) struct FQClone; | ||
| pub(crate) struct FQDefault; | ||
| pub(crate) struct FQOption; | ||
| pub(crate) struct FQResult; | ||
|
|
||
| impl ToTokens for FQAny { | ||
| fn to_tokens(&self, tokens: &mut TokenStream) { | ||
| quote!(::core::any::Any).to_tokens(tokens); | ||
| } | ||
| } | ||
|
|
||
| impl ToTokens for FQBox { | ||
| fn to_tokens(&self, tokens: &mut TokenStream) { | ||
| quote!(::std::boxed::Box).to_tokens(tokens); | ||
| } | ||
| } | ||
|
|
||
| impl ToTokens for FQClone { | ||
| fn to_tokens(&self, tokens: &mut TokenStream) { | ||
| quote!(::core::clone::Clone).to_tokens(tokens); | ||
| } | ||
| } | ||
|
|
||
| impl ToTokens for FQDefault { | ||
| fn to_tokens(&self, tokens: &mut TokenStream) { | ||
| quote!(::core::default::Default).to_tokens(tokens); | ||
| } | ||
| } | ||
|
|
||
| impl ToTokens for FQOption { | ||
| fn to_tokens(&self, tokens: &mut TokenStream) { | ||
| quote!(::core::option::Option).to_tokens(tokens); | ||
| } | ||
| } | ||
|
|
||
| impl ToTokens for FQResult { | ||
| fn to_tokens(&self, tokens: &mut TokenStream) { | ||
| quote!(::core::result::Result).to_tokens(tokens); | ||
| } | ||
| } |
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