Bitshift

compiler/compiler.go

@@ -148,6 +148,10 @@ func (c *Compiler) Compile(node ast.Node) error {
 			c.emit(code.OpBitwiseXOR)
 		case "&":
 			c.emit(code.OpBitwiseAND)
+		case "<<":
+			c.emit(code.OpLeftShift)
+		case ">>":
+			c.emit(code.OpRightShift)
 		case "||":
 			c.emit(code.OpOr)
 		case "&&":

compiler/compiler_test.go

@@ -87,6 +87,26 @@ func TestIntegerArithmetic(t *testing.T) {
 				code.Make(code.OpPop),
 			},
 		},
+		{
+			input:             "1 << 2",
+			expectedConstants: []interface{}{1, 2},
+			expectedInstructions: []code.Instructions{
+				code.Make(code.OpConstant, 0),
+				code.Make(code.OpConstant, 1),
+				code.Make(code.OpLeftShift),
+				code.Make(code.OpPop),
+			},
+		},
+		{
+			input:             "4 >> 2",
+			expectedConstants: []interface{}{4, 2},
+			expectedInstructions: []code.Instructions{
+				code.Make(code.OpConstant, 0),
+				code.Make(code.OpConstant, 1),
+				code.Make(code.OpRightShift),
+				code.Make(code.OpPop),
+			},
+		},
 		{
 			input:             "-1",
 			expectedConstants: []interface{}{1},