Update wasm code

Add exception test (useful for wasm)

Author: khvzak

.github/workflows/main.yml

@@ -99,7 +99,7 @@ jobs:
         lua: [lua54, lua53, lua52, lua51]
     steps:
     - uses: actions/checkout@v3
-    - uses: dtolnay/rust-toolchain@stable
+    - uses: dtolnay/rust-toolchain@nightly
       with:
         target: wasm32-unknown-emscripten
     - name: Install emscripten

src/lib.rs

@@ -118,14 +118,13 @@ impl Build {
 
                 for file in fs::read_dir(&source_dir).unwrap() {
                     let file = file.unwrap();
-                    let filename = file.file_name().to_string_lossy().to_string();
+                    let filename = file.file_name();
+                    let filename = filename.to_str().unwrap();
                     let src_file = source_dir.join(file.file_name());
                     let dst_file = cpp_source_dir.join(file.file_name());
 
                     let mut content = fs::read(src_file).unwrap();
-                    // ljumptab.h only contains definitions and will cause errors when wrapping with
-                    // 'extern "C"'
-                    if filename.ends_with(".h") && !["ljumptab.h"].contains(&filename.as_str()) {
+                    if ["lauxlib.h", "lua.h", "lualib.h"].contains(&filename) {
                         content.splice(0..0, b"extern \"C\" {\n".to_vec());
                         content.extend(b"\n}".to_vec())
                     }

testcrate/src/lib.rs

@@ -6,6 +6,34 @@ extern "C" {
     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;
+    pub fn luaL_error(state: *mut c_void, fmt: *const c_char, ...) -> c_int;
+
+    pub fn lua_pushcclosure(
+        state: *mut c_void,
+        f: unsafe extern "C-unwind" fn(state: *mut c_void) -> c_int,
+        n: c_int,
+    );
+
+    #[cfg(feature = "lua51")]
+    pub fn lua_pcall(state: *mut c_void, nargs: c_int, nresults: c_int, errfunc: c_int) -> c_int;
+    #[cfg(feature = "lua52")]
+    pub fn lua_pcallk(
+        state: *mut c_void,
+        nargs: c_int,
+        nresults: c_int,
+        errfunc: c_int,
+        ctx: c_int,
+        k: *const c_void,
+    ) -> c_int;
+    #[cfg(any(feature = "lua53", feature = "lua54"))]
+    pub fn lua_pcallk(
+        state: *mut c_void,
+        nargs: c_int,
+        nresults: c_int,
+        errfunc: c_int,
+        ctx: isize,
+        k: *const c_void,
+    ) -> c_int;
 
     #[cfg(feature = "lua52")]
     pub fn lua_getglobal(state: *mut c_void, k: *const c_char);
@@ -18,8 +46,18 @@ pub unsafe fn lua_getglobal(state: *mut c_void, k: *const c_char) {
     lua_getfield(state, -10002 /* LUA_GLOBALSINDEX */, k);
 }
 
+#[cfg(any(feature = "lua52", feature = "lua53", feature = "lua54"))]
+pub unsafe fn lua_pcall(
+    state: *mut c_void,
+    nargs: c_int,
+    nresults: c_int,
+    errfunc: c_int,
+) -> c_int {
+    lua_pcallk(state, nargs, nresults, errfunc, 0, std::ptr::null())
+}
+
 #[test]
-fn lua_works() {
+fn test_lua() {
     use std::{ptr, slice};
     unsafe {
         let state = luaL_newstate();
@@ -46,7 +84,7 @@ fn lua_works() {
 }
 
 #[test]
-fn unicode_identifiers() {
+fn test_unicode_identifiers() {
     unsafe {
         let state = luaL_newstate();
         let code = "local 😀 = 0\0";
@@ -57,3 +95,27 @@ fn unicode_identifiers() {
         assert_ne!(0, ret);
     }
 }
+
+#[test]
+fn test_exceptions() {
+    use std::{ptr, slice, str};
+    unsafe {
+        let state = luaL_newstate();
+        assert!(state != ptr::null_mut());
+
+        unsafe extern "C-unwind" fn it_panics(state: *mut c_void) -> c_int {
+            luaL_error(state, "exception!\0".as_ptr().cast())
+        }
+
+        lua_pushcclosure(state, it_panics, 0);
+        let result = lua_pcall(state, 0, 0, 0);
+        assert_eq!(result, 2); // LUA_ERRRUN
+        let s = {
+            let mut len: c_long = 0;
+            let version_ptr = lua_tolstring(state, -1, &mut len);
+            let s = slice::from_raw_parts(version_ptr as *const u8, len as usize);
+            str::from_utf8(s).unwrap()
+        };
+        assert_eq!(s, "exception!");
+    }
+}