Spelling corrections

Interpreter can now evaluate Booleans

git-svn-id: https://svn.tlawal.org/svn/monkey@45 f6afcba9-9ef1-4bdd-9b72-7484f5705bac

evaluator/evaluator.go

@@ -17,6 +17,9 @@ func Eval(node ast.Node) object.Object {
 		// Expressions
 	case *ast.IntegerLiteral:
 		return &object.Integer{Value: node.Value}
+
+	case *ast.Boolean:
+		return &object.Boolean{Value: node.Value}
 	}
 
 	return nil

evaluator/evaluator_test.go

@@ -22,6 +22,22 @@ func TestEvalIntegerExpression(l_test *testing.T) {
 	}
 }
 
+func TestEvalBooleanExpression(l_test *testing.T){
+	tests := []struct {
+		input string
+		expected bool
+	}{
+		{"true", true},
+		{"false", false},
+	}
+
+	for _, tt := range tests{
+			evaluated := test_eval(tt.input)
+			test_boolean_object(l_test, evaluated, tt.expected)
+		}
+	}
+
+
 // Helpers
 func test_eval(input string) object.Object {
 	l_lexer := lexer.New(input)
@@ -43,3 +59,17 @@ func test_integer_object(l_test *testing.T, l_object object.Object, expected int
 	}
 	return true
 }
+
+func test_boolean_object(l_test *testing.T, l_object object.Object, expected bool)bool {
+	result, ok := l_object.(*object.Boolean)
+	if !ok {
+		l_test.Errorf("object is not Boolean, got=%T (%+v)", l_object, l_object)
+		return false
+	}
+
+	if result.Value != expected {
+		l_test.Errorf("object has wrong value, got=%T, want=%t", result.Value, expected)
+		return false
+	}
+	return true
+}

object/object.go

@@ -37,7 +37,7 @@ func (b *Boolean) Type() ObjectType {
 	return BOOLEAN_OBJECT
 }
 
-func (b *Boolean) Inpect() string {
+func (b *Boolean) Inspect() string {
 	return fmt.Sprintf("%t", b.Value)
 }
 
@@ -48,6 +48,6 @@ func (n *Null) Type() ObjectType {
 	return NULL_OBJECT
 }
 
-func (n *Null) Inpect() string {
+func (n *Null) Inspect() string {
 	return "null"
 }