feat(rustlang book): Advanced features(Derive Macros)

Author: unpervertedkid

rustlang_book/advanced_features/macros/hello_macro/Cargo.toml

@@ -0,0 +1,9 @@
+workspace = { members = ["hello_macro_derive"] }
+[package]
+name = "hello_macro"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

rustlang_book/advanced_features/macros/hello_macro/hello_macro_derive/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "hello_macro_derive"
+version = "0.1.0"
+edition = "2021"
+
+[lib]
+proc-macro = true
+
+[dependencies]
+syn = "1.0"
+quote = "1.0"

rustlang_book/advanced_features/macros/hello_macro/hello_macro_derive/src/lib.rs

@@ -0,0 +1,27 @@
+use proc_macro::TokenStream;
+use quote::quote;
+use syn;
+
+#[proc_macro_derive(HelloMacro)]
+pub fn hello_macro_derive(input: TokenStream) -> TokenStream {
+    // Construct a representation of Rust code as a syntax tree
+    // that we can manipulate
+    let ast = syn::parse(input).unwrap();
+
+    // Build the trait implementation
+    impl_hello_macro(&ast)
+}
+
+fn impl_hello_macro(ast: &syn::DeriveInput) -> TokenStream {
+    let name = &ast.ident;
+
+    let gen = quote! {
+        impl HelloMacro for #name {
+        fn hello_macro() {
+        println!("Hello, Macro! My name is {}", stringify!(#name));
+        }
+        }
+    };
+
+    gen.into()
+}

rustlang_book/advanced_features/macros/hello_macro/src/lib.rs

@@ -0,0 +1,3 @@
+pub trait HelloMacro {
+    fn hello_macro();
+}

rustlang_book/advanced_features/macros/pancakes/Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "pancakes"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+hello_macro = { path = "../hello_macro" }
+hello_macro_derive = { path = "../hello_macro/hello_macro_derive/" }

rustlang_book/advanced_features/macros/pancakes/src/main.rs

@@ -0,0 +1,9 @@
+use hello_macro::HelloMacro;
+use hello_macro_derive::HelloMacro;
+
+#[derive(HelloMacro)]
+struct Chapatis;
+
+fn main() {
+    Chapatis::hello_macro();
+}