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| 1 // Copyright (c) 2016, the Dart project authors. Please see the AUTHORS file |
| 2 // for details. All rights reserved. Use of this source code is governed by a |
| 3 // BSD-style license that can be found in the LICENSE file. |
| 4 |
| 5 import 'package:source_span/source_span.dart'; |
| 6 |
| 7 import 'ast.dart'; |
| 8 import 'visitor.dart'; |
| 9 |
| 10 typedef bool _IsDefined(String variable); |
| 11 |
| 12 /// An AST visitor that ensures that all variables are valid. |
| 13 class Validator extends RecursiveVisitor { |
| 14 final _IsDefined _isDefined; |
| 15 |
| 16 Validator(this._isDefined); |
| 17 |
| 18 void visitVariable(VariableNode node) { |
| 19 if (_isDefined(node.name)) return; |
| 20 throw new SourceSpanFormatException("Undefined variable.", node.span); |
| 21 } |
| 22 } |
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