add feature ucid for lua54 unicode identifiers

Author: Kingfree

Cargo.toml

@@ -11,6 +11,9 @@ description = """
 Sources of Lua 5.1/5.2/5.3/5.4 and logic to build them.
 """
 
+[features]
+ucid = [] # accept UniCode IDentifiers
+
 [workspace]
 members = ["testcrate"]
 

src/lib.rs

@@ -108,6 +108,8 @@ impl Build {
 
         if let Lua54 = version {
             config.define("LUA_COMPAT_5_3", None);
+            #[cfg(feature = "ucid")]
+            config.define("LUA_UCID", None);
         }
 
         if cfg!(debug_assertions) {

testcrate/Cargo.toml

@@ -10,5 +10,6 @@ lua53 = []
 lua52 = []
 lua51 = []
 
-[build-dependencies]
-lua-src = { path = ".." }
+[build-dependencies.lua-src]
+path = ".."
+features = ["ucid"]

testcrate/src/lib.rs

@@ -5,6 +5,7 @@ extern "C" {
     pub fn luaL_openlibs(state: *mut c_void);
     pub fn lua_getfield(state: *mut c_void, index: c_int, k: *const c_char);
     pub fn lua_tolstring(state: *mut c_void, index: c_int, len: *mut c_long) -> *const c_char;
+    pub fn luaL_loadstring(state: *mut c_void, s: *const c_char) -> c_int;
 
     #[cfg(any(feature = "lua52", feature = "lua53", feature = "lua54"))]
     pub fn lua_getglobal(state: *mut c_void, k: *const c_char);
@@ -41,3 +42,16 @@ fn lua_works() {
         assert_eq!(version, "Lua 5.4".as_bytes());
     }
 }
+
+#[test]
+fn unicode_identifiers() {
+    unsafe {
+        let state = luaL_newstate();
+        let code = "local 😀 = 0\n";
+        let ret = luaL_loadstring(state, code.as_ptr().cast());
+        #[cfg(feature = "lua54")]
+        assert_eq!(0, ret);
+        #[cfg(not(feature = "lua54"))]
+        assert_ne!(0, ret);
+    }
+}