Add primitive procedural macro example

commit-id:824a01ae

Cargo.toml

@@ -18,6 +18,7 @@ members = [
     "utils/test-for-each-example",
     "xtask",
 ]
+exclude = ["examples/procedural_macro/some_macro"]
 "resolver" = "2"
 
 [workspace.package]

examples/procedural_macro/hello_world/Scarb.lock

@@ -0,0 +1,13 @@
+# Code generated by scarb DO NOT EDIT.
+version = 1
+
+[[package]]
+name = "hello_world"
+version = "0.1.0"
+dependencies = [
+ "some_macro",
+]
+
+[[package]]
+name = "some_macro"
+version = "0.1.0"

examples/procedural_macro/hello_world/Scarb.toml

@@ -0,0 +1,12 @@
+[package]
+name = "hello_world"
+version = "0.1.0"
+edition = "2023_10"
+
+# See more keys and their definitions at https://docs.swmansion.com/scarb/docs/reference/manifest.html
+
+[dependencies]
+some_macro = { path = "../some_macro" }
+
+[dev-dependencies]
+cairo_test = "2.6.4"

examples/procedural_macro/hello_world/src/lib.cairo

@@ -0,0 +1,2 @@
+#[some]
+fn main() -> felt252 { 12 }

examples/procedural_macro/some_macro/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "some_macro"
+version = "0.1.0"
+edition = "2021"
+publish = false
+
+[lib]
+crate-type = ["cdylib"]
+
+[dependencies]
+cairo-lang-macro = "0.1"

examples/procedural_macro/some_macro/Scarb.toml

@@ -0,0 +1,5 @@
+[package]
+name = "some_macro"
+version = "0.1.0"
+
+[cairo-plugin]

examples/procedural_macro/some_macro/src/lib.rs

@@ -0,0 +1,7 @@
+use cairo_lang_macro::{attribute_macro, ProcMacroResult, TokenStream};
+
+#[attribute_macro]
+pub fn some(_attr: TokenStream, token_stream: TokenStream) -> ProcMacroResult {
+    let token_stream = TokenStream::new(token_stream.to_string().replace("12", "34"));
+    ProcMacroResult::new(token_stream)
+}