Add skeleton and test for Encode/RefEncode macros

Author: madsmtm

.github/workflows/ci.yml

@@ -153,7 +153,7 @@ jobs:
       ARGS: --no-default-features --features ${{ matrix.runtime || 'apple' }} ${{ matrix.args }}
       # Use --no-fail-fast, except with dinghy
       TESTARGS: ${{ matrix.dinghy && ' ' || '--no-fail-fast' }} ${{ matrix.test-args }}
-      FEATURES: ${{ matrix.features || 'malloc,block,exception,catch_all,verify_message' }}
+      FEATURES: ${{ matrix.features || 'malloc,block,exception,catch_all,verify_message,derive' }}
       UNSTABLE_FEATURES: ${{ matrix.unstable-features || 'unstable-autoreleasesafe' }}
 
     runs-on: ${{ matrix.os }}

objc2-encode/Cargo.toml

@@ -18,6 +18,12 @@ repository = "https://github.com/madsmtm/objc2"
 documentation = "https://docs.rs/objc2-encode/"
 license = "MIT"
 
+[features]
+derive = ["objc2-proc-macros"]
+
+[dependencies]
+objc2-proc-macros = { path = "../objc2-proc-macros", optional = true }
+
 [package.metadata.docs.rs]
 default-target = "x86_64-apple-darwin"
 

objc2-encode/src/lib.rs

@@ -115,3 +115,5 @@ mod static_str;
 
 pub use self::encode::{Encode, EncodeArguments, RefEncode};
 pub use self::encoding::Encoding;
+#[cfg(feature = "derive")]
+pub use objc2_proc_macros::{Encode, RefEncode};

objc2-encode/tests/test_derive.rs

@@ -0,0 +1,22 @@
+#![cfg(feature = "derive")]
+use objc2_encode::{Encode, Encoding, RefEncode};
+
+#[cfg(target_pointer_width = "32")]
+type CGFloat = f32;
+
+#[cfg(target_pointer_width = "64")]
+type CGFloat = f64;
+
+#[derive(Encode, RefEncode)]
+#[repr(C)]
+struct CGPoint {
+    x: CGFloat,
+    y: CGFloat,
+}
+
+#[test]
+fn cgpoint() {
+    let enc = Encoding::Struct("CGPoint", &[CGFloat::ENCODING, CGFloat::ENCODING]);
+    assert_eq!(CGPoint::ENCODING, enc);
+    assert_eq!(CGPoint::ENCODING_REF, Encoding::Pointer(&enc));
+}

objc2-proc-macros/Cargo.toml

@@ -30,5 +30,10 @@ gnustep-1-9 = ["gnustep-1-8"]
 gnustep-2-0 = ["gnustep-1-9"]
 gnustep-2-1 = ["gnustep-2-0"]
 
+[dependencies]
+syn = "1.0"
+quote = "1.0"
+# TODO: Use `proc-macro-crate` or similar for better usage downstream?
+
 [package.metadata.docs.rs]
 default-target = "x86_64-apple-darwin"

objc2-proc-macros/src/lib.rs

@@ -16,3 +16,19 @@
 #[cfg(doctest)]
 #[doc = include_str!("../README.md")]
 extern "C" {}
+
+use proc_macro::TokenStream;
+
+/// TODO
+#[proc_macro_derive(Encode)]
+pub fn encode_derive(input: TokenStream) -> TokenStream {
+    dbg!(input);
+    todo!()
+}
+
+/// TODO
+#[proc_macro_derive(RefEncode)]
+pub fn ref_encode_derive(input: TokenStream) -> TokenStream {
+    dbg!(input);
+    todo!()
+}