#[proc_macro_derive(Builder)] pub fn derive(input: TokenStream) -> TokenStream { let st = syn::parse_macro_input!(input as syn::DeriveInput); match expand_code(&st) { Ok(token_stream) => token_stream.into(), Err(e) => e.to_compile_error().into(), } } fn get_fields( st:...
quote! { pub struct CommandBuilder { #builder_fields } } 在为CommandBuilder类添加字段后,Command::builder函数中生成CommandBuilder的默认实例还未添加字段初始值,这里简单起见,我们用#[derive(Default)]派生宏自动为CommandBuilder类实现DefaultTrait,从而可以调用该Traitdefault()函数生成其默认实例。
/// 应用配置构建器#[derive(bon::Builder)]#[builder(doc ="构建应用配置")]structAppConfig{/// 服务器监听端口#[builder(default = 8080)]port:u16,/// 数据库连接URL#[builder(validate = |url: &str| url.starts_with("postgres://"))]database_url:String,/// 日志级别#[builder(default ="in...
}fnexpand_code(st: &syn::DeriveInput)->syn::Result<proc_macro2::TokenStream> {letstruct_name_literal= st.ident.to_string();letbuilder_name_literal=format!("{}Builder", struct_name_literal);letbuilder_name_ident= syn::Ident::new(&builder_name_literal, st.span());letstruct_ident= &st...
#[derive(Builder)]pubstructCommand{executable:String,#[builder(each ="arg")]args:Vec<String>,#[builder(each ="env")]env:Vec<String>,current_dir:Option<String>,} AST 对应的语法树结构: 代码语言:ini 复制 // Command 语法树 DeriveInput { ...
Rust macro to automatically implement the builder pattern for arbitrary structs. A simple #[derive(Builder)] will generate a FooBuilder for your struct Foo with all setter-methods and a build method. How it Works use derive_builder::Builder; #[derive(Default, Builder, Debug)] #[builder(sette...
在提交代码时,clippy 嫌弃某个函数参数过多。于是我们引入了 derive_builder。由于数据结构是 tonic_build 生成的,所以我们需要修改 build 脚本来添加更多的 attribute。我们使用了一个 trait 来简化 build 代码。最后,修复了 rsvp.query 函数的一个隐含的没有做参数校验的问题。
Rustmacro to automatically implement thebuilder patternfor arbitrary structs. A simple#[derive(Builder)]will generate aFooBuilderfor your structFoowith all setter-methods and a build method. How it Works usederive_builder::Builder;#[derive(Default,Builder,Debug)]#[builder(setter(into))]structChanne...
// Window 抽象pub struct Window{pub(crate)window:platform_impl::Window,}// Clipboard 抽象#[derive(Debug,Clone,Default)]/// Object that allows you to access the `Clipboard` instance.pub structClipboard(ClipboardPlatform);// EventLoop 抽象pub struct EventLoop<T:'static>{pub(crate)event_loop:...
use bon::Builder; #[derive(Builder)] // 添加这一行就够了 struct User {id: u32, name: String, } let user = User::builder() .id(1) .name("Bon".to_owned()) .build(); assert_eq!(user.id, 1); assert_eq!(user.name, "Bon"); ...