blob: f4d78cf3291a2bc71440fdd73c7803fc968b6b49 [file] [log] [blame]
// Copyright (c) 2016, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
import 'package:source_span/source_span.dart';
import 'ast.dart';
import 'visitor.dart';
typedef bool _IsDefined(String variable);
/// An AST visitor that ensures that all variables are valid.
class Validator extends RecursiveVisitor {
final _IsDefined _isDefined;
void visitVariable(VariableNode node) {
if (_isDefined( return;
throw new SourceSpanFormatException("Undefined variable.", node.span);