added bitwise operators and shift support, updated parser, compiler, and docs. fixed copyright.

lynglib/src/commonTest/kotlin/BitwiseTest.kt

@@ -0,0 +1,50 @@
+/*
+ * Copyright 2025 Sergey S. Chernov real.sergeych@gmail.com
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+import kotlinx.coroutines.test.runTest
+import net.sergeych.lyng.eval
+import net.sergeych.lyng.obj.ObjInt
+import kotlin.test.Test
+import kotlin.test.assertEquals
+import kotlin.test.assertFails
+
+class BitwiseTest {
+    @Test
+    fun bitwiseOperators_Int() = runTest {
+        suspend fun e(src: String) = eval(src)
+
+        assertEquals(ObjInt(1), e("5 & 3"))
+        assertEquals(ObjInt(7), e("5 | 3"))
+        assertEquals(ObjInt(6), e("5 ^ 3"))
+        assertEquals(ObjInt(-1), e("~0"))
+
+        assertEquals(ObjInt(8), e("1 << 3"))
+        assertEquals(ObjInt(1), e("8 >> 3"))
+
+        // shift count masking (like JVM): 65 -> 1
+        assertEquals(ObjInt(2), e("1 << 65"))
+
+        // precedence: additive tighter than shifts
+        assertEquals(ObjInt(24), e("1 + 2 << 3"))
+
+        // precedence chain: & tighter than ^ tighter than |
+        assertEquals(ObjInt(3), e("1 | 2 ^ 3 & 1"))
+
+        // type mismatch should raise
+        assertFails { e("1 & 2.0") }
+    }
+}

lynglib/src/commonTest/kotlin/ScriptTest.kt

@@ -28,7 +28,6 @@ import kotlin.test.*
 import kotlin.time.Duration.Companion.seconds
 
 class ScriptTest {
-
     @Test
     fun testVersion() {
         println("--------------------------------------------")
@@ -3381,4 +3380,4 @@ class ScriptTest {
                 .trimIndent()
         )
     }
-}
+}

lynglib/src/commonTest/kotlin/ScriptTest_OptionalAssign.kt

@@ -1,3 +1,20 @@
+/*
+ * Copyright 2025 Sergey S. Chernov real.sergeych@gmail.com
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
 /*
  * Tests for optional chaining assignment semantics (no-op on null receiver)
  */