Initial commit

2026-04-14 03:44:59 +02:00
commit a6eb642c76
32 changed files with 589 additions and 0 deletions
@@ -0,0 +1,12 @@
+[package]
+name = "demo_macro"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+proc-macro2 = "1.0.106"
+quote = "1.0.45"
+syn = "2.0.117"
+
+[lib]
+proc-macro = true
@@ -0,0 +1,70 @@
+use proc_macro::TokenStream;
+
+#[proc_macro]
+pub fn hello_world(_item: TokenStream) -> TokenStream {
+    "println!(\"Hello, World\")".parse().unwrap()
+}
+
+// #[proc_macro]
+// pub fn make_answer(_item: TokenStream) -> TokenStream {
+//     "fn answer() -> u32 { 42 }".parse().unwrap()
+// }
+
+// use quote::quote;
+//
+// #[proc_macro]
+// pub fn make_answer_quote(_item: TokenStream) -> TokenStream {
+//     let value: u32 = 43;
+//
+//     quote! {
+//         fn answer_quote() -> u32 {
+//             #value
+//         }
+//     }
+//     .into()
+// }
+
+// use quote::ToTokens;
+// use syn::{
+//     Error, LitInt, Token,
+//     parse::{Parse, ParseStream},
+//     parse_macro_input,
+// };
+//
+// struct Custom {
+//     value: LitInt,
+// }
+//
+// impl Parse for Custom {
+//     // answer = <value>
+//     fn parse(input: ParseStream) -> syn::Result<Self> {
+//         let ident: syn::Ident = input.parse()?;
+//         if ident != "answer" {
+//             return Err(Error::new(ident.span(), "expected 'answer'"));
+//         }
+//
+//         input.parse::<Token![=]>()?;
+//
+//         let value = input.parse()?;
+//
+//         Ok(Custom { value })
+//     }
+// }
+//
+// impl ToTokens for Custom {
+//     fn to_tokens(&self, tokens: &mut proc_macro2::TokenStream) {
+//         self.value.to_tokens(tokens);
+//     }
+// }
+//
+// #[proc_macro]
+// pub fn make_answer_custom(input: TokenStream) -> TokenStream {
+//     let custom = parse_macro_input!(input as Custom);
+//
+//     quote! {
+//         fn answer_custom() -> u32 {
+//             #custom
+//         }
+//     }
+//     .into()
+// }