更新：添加doString方法及对应的单元测试

src/bridge.cj

@@ -1,4 +1,4 @@
-package luarunner
+package luaRunner
 
 // ==================== FFI底层 ====================
 
@@ -13,6 +13,8 @@ foreign func unload_lib(selfd: CPointer<Unit>, name: CString): Int32
 @C
 foreign func run(selfd: CPointer<Unit>, path: CString, arg: CString): Int32
 @C
+foreign func dostring(selfd: CPointer<Unit>,target: CString): Int32
+@C
 foreign func cleanup(selfd: CPointer<Unit>): Int32
 @C
 foreign func get_errno(): Int32
@@ -212,6 +214,21 @@ public class LuaRunner {
         }
         return this.cachedResult
     }
+
+    public func doString(target: String): String
+    {
+        let targetptr = toCStr(target);
+        let code = unsafe { dostring(this.handle, targetptr) }
+        unsafe{
+            if(!targetptr.isNull()){LibC.free(targetptr)}
+        }
+        this.cachedResult = toString(unsafe { getresult(this.handle) })
+        
+        if (code != 0) { 
+            throw LuaError(unsafe { get_errno() }, this.cachedResult) 
+        }
+        return this.cachedResult
+    }
     
     /// 获取缓存的结果
     public func result(): String { this.cachedResult }

src/lua_runner_test.cj

@@ -1,4 +1,4 @@
-package luarunner
+package luaRunner
 
 import std.unittest.*  // cjlint-ignore G.PKG.01
 import std.fs.*  // cjlint-ignore G.PKG.01
@@ -254,7 +254,58 @@ func testRedirectIoRead(): Unit {
 }
 
 // ====================
-// 6. 错误码与回调
+// 6. doString 测试
+// ====================
+
+@Test
+func testDoStringSimple(): Unit {
+    let runner = LuaRunner()
+    let res = runner.doString("return 1 + 1")
+    @Expect(res, "2")
+}
+
+@Test
+func testDoStringWithGlobal(): Unit {
+    let runner = LuaRunner()
+    let res = runner.doString("g = 42; return g")
+    @Expect(res, "42")
+}
+
+@Test
+func testDoStringNoReturn(): Unit {
+    let runner = LuaRunner()
+    try {
+        runner.doString("x = 10")
+        fail("Should throw bad ret error")
+    } catch (e: LuaError) {
+        @Expect(e.code, 5011)
+    }
+}
+
+@Test
+func testDoStringSyntaxError(): Unit {
+    let runner = LuaRunner()
+    try {
+        runner.doString("if true then")
+        fail("Should throw syntax error")
+    } catch (e: LuaError) {
+        @Expect(e.code, 5020)
+    }
+}
+
+@Test
+func testDoStringNilReturn(): Unit {
+    let runner = LuaRunner()
+    try {
+        runner.doString("return nil")
+        fail("Should throw bad ret error")
+    } catch (e: LuaError) {
+        @Expect(e.code, 5011)
+    }
+}
+
+// ====================
+// 7. 错误码与回调
 // ====================
 
 @Test