feat: starknet-types-macros adding felt!()

Cargo.toml

@@ -2,6 +2,7 @@
 members = [
     "crates/starknet-types-core",
     "crates/starknet-types-rpc",
+    "crates/starknet-types-macros",
 ]
 
 exclude = ["ensure_no_std", "fuzz"]

crates/starknet-types-macros/Cargo.toml

@@ -0,0 +1,21 @@
+[package]
+name = "starknet-types-macros"
+version = "0.1.5"
+edition = "2021"
+license = "MIT"
+homepage = "https://github.com/starknet-io/types-rs"
+repository = "https://github.com/starknet-io/types-rs"
+categories = ["mathematics", "cryptography"]
+keywords = ["stark", "zkp", "cairo"]
+description = "Macros types representation for Starknet"
+readme = "README.md"
+
+[lib]
+proc-macro = true
+
+[dependencies]
+starknet-types-core = { path = "../starknet-types-core", default-features = false, features = [
+    "serde",
+] }
+syn = { version = "0.15", features = ["full", "extra-traits"] }
+quote = "0.6"

crates/starknet-types-macros/src/lib.rs

@@ -0,0 +1,24 @@
+use proc_macro::TokenStream;
+use quote::quote;
+use starknet_types_core::felt::Felt;
+use syn::{parse_macro_input, LitStr};
+
+#[proc_macro]
+pub fn felt(input: TokenStream) -> TokenStream {
+    let input = parse_macro_input!(input as LitStr);
+
+    let str_value = input.value();
+
+    let felt_value = if str_value.starts_with("0x") {
+        Felt::from_hex(&str_value).expect("invalid Felt value")
+    } else {
+        Felt::from_dec_str(&str_value).expect("invalid Felt value")
+    };
+
+    let felt_bytes = felt_value.to_bytes_be();
+
+    quote! {
+        Felt::from_bytes_be(&[#(#felt_bytes),*])
+    }
+    .into()
+}

crates/starknet-types-rpc/Cargo.toml

@@ -22,7 +22,10 @@ default = ["std"]
 std = ["serde/std", "starknet-types-core/std"]
 
 [dependencies]
-starknet-types-core = { path = "../starknet-types-core", default-features = false, features = ["serde"] }
+starknet-types-core = { path = "../starknet-types-core", default-features = false, features = [
+    "serde",
+] }
+starknet-types-macros = { path = "../starknet-types-macros" }
 serde = { version = "1", default-features = false, features = ["derive"] }
 
 [dev-dependencies]

crates/starknet-types-rpc/src/custom/block_id.rs

@@ -69,10 +69,11 @@ impl<'de, F: Deserialize<'de>> serde::Deserialize<'de> for BlockId<F> {
 #[test]
 fn block_id_from_hash() {
     pub use starknet_types_core::felt::Felt;
+    use starknet_types_macros::felt;
 
     let s = "{\"block_hash\":\"0x123\"}";
     let block_id: BlockId<Felt> = serde_json::from_str(s).unwrap();
-    assert_eq!(block_id, BlockId::Hash(Felt::from_hex("0x123").unwrap()));
+    assert_eq!(block_id, BlockId::Hash(felt!("0x123")));
 }
 
 #[test]
@@ -106,8 +107,9 @@ fn block_id_from_pending() {
 #[test]
 fn block_id_to_hash() {
     pub use starknet_types_core::felt::Felt;
+    use starknet_types_macros::felt;
 
-    let block_id = BlockId::Hash(Felt::from_hex("0x123").unwrap());
+    let block_id = BlockId::Hash(felt!("0x123"));
     let s = serde_json::to_string(&block_id).unwrap();
     assert_eq!(s, "{\"block_hash\":\"0x123\"}");
 }