moulo

compiler/compiler.go

@@ -139,6 +139,8 @@ func (c *Compiler) Compile(node ast.Node) error {
 			c.emit(code.OpMul)
 		case "/":
 			c.emit(code.OpDiv)
+		case "%":
+			c.emit(code.OpMod)
 		case ">":
 			c.emit(code.OpGreaterThan)
 		case ">=":

compiler/compiler_test.go

@@ -77,6 +77,16 @@ func TestIntegerArithmetic(t *testing.T) {
 				code.Make(code.OpPop),
 			},
 		},
+		{
+			input:             "5 % 2",
+			expectedConstants: []interface{}{5, 2},
+			expectedInstructions: []code.Instructions{
+				code.Make(code.OpConstant, 0),
+				code.Make(code.OpConstant, 1),
+				code.Make(code.OpMod),
+				code.Make(code.OpPop),
+			},
+		},
 		{
 			input:             "-1",
 			expectedConstants: []interface{}{1},