| // Copyright (c) 2012, 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. |
| |
| library visitor; |
| |
| import 'model.dart'; |
| import 'yaml_map.dart'; |
| |
| /// The visitor pattern for YAML documents. |
| class Visitor { |
| /// Returns [alias]. |
| visitAlias(AliasNode alias) => alias; |
| |
| /// Returns [scalar]. |
| visitScalar(ScalarNode scalar) => scalar; |
| |
| /// Visits each node in [seq] and returns a list of the results. |
| visitSequence(SequenceNode seq) |
| => seq.content.map((e) => e.visit(this)).toList(); |
| |
| /// Visits each key and value in [map] and returns a map of the results. |
| visitMapping(MappingNode map) { |
| var out = new YamlMap(); |
| for (var key in map.content.keys) { |
| out[key.visit(this)] = map.content[key].visit(this); |
| } |
| return out; |
| } |
| } |