array literals

compiler/compiler.go

@@ -194,6 +194,16 @@ func (c *Compiler) Compile(node ast.Node) error {
 		str := &object.String{Value: node.Value}
 		c.emit(code.OpConstant, c.addConstant(str))
 
+	case *ast.ArrayLiteral:
+		for _, el := range node.Elements {
+			err := c.Compile(el)
+			if err != nil {
+				return err
+			}
+		}
+
+		c.emit(code.OpArray, len(node.Elements))
+
 	}
 
 	return nil

compiler/compiler_test.go

@@ -302,6 +302,49 @@ func TestStringExpressions(t *testing.T) {
 	runCompilerTests(t, tests)
 }
 
+func TestArrayLiterals(t *testing.T) {
+	tests := []compilerTestCase{
+		{
+			input:             "[]",
+			expectedConstants: []interface{}{},
+			expectedInstructions: []code.Instructions{
+				code.Make(code.OpArray, 0),
+				code.Make(code.OpPop),
+			},
+		},
+		{
+			input:             "[1, 2, 3]",
+			expectedConstants: []interface{}{1, 2, 3},
+			expectedInstructions: []code.Instructions{
+				code.Make(code.OpConstant, 0),
+				code.Make(code.OpConstant, 1),
+				code.Make(code.OpConstant, 2),
+				code.Make(code.OpArray, 3),
+				code.Make(code.OpPop),
+			},
+		},
+		{
+			input:             "[1 + 2, 3 - 4, 5 * 6]",
+			expectedConstants: []interface{}{1, 2, 3, 4, 5, 6},
+			expectedInstructions: []code.Instructions{
+				code.Make(code.OpConstant, 0),
+				code.Make(code.OpConstant, 1),
+				code.Make(code.OpAdd),
+				code.Make(code.OpConstant, 2),
+				code.Make(code.OpConstant, 3),
+				code.Make(code.OpSub),
+				code.Make(code.OpConstant, 4),
+				code.Make(code.OpConstant, 5),
+				code.Make(code.OpMul),
+				code.Make(code.OpArray, 3),
+				code.Make(code.OpPop),
+			},
+		},
+	}
+
+	runCompilerTests(t, tests)
+}
+
 func runCompilerTests(t *testing.T, tests []compilerTestCase) {
 	t.Helper()