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1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file |
2 // for details. All rights reserved. Use of this source code is governed by a | 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. | 3 // BSD-style license that can be found in the LICENSE file. |
4 | 4 |
5 /** | 5 /** |
6 * Takes a parsed and composed YAML document (what the spec calls the | 6 * Takes a parsed and composed YAML document (what the spec calls the |
7 * "representation graph") and creates native Dart objects that represent that | 7 * "representation graph") and creates native Dart objects that represent that |
8 * document. | 8 * document. |
9 */ | 9 */ |
10 class _Constructor extends _Visitor { | 10 class _Constructor extends _Visitor { |
11 /** The root node of the representation graph. */ | 11 /** The root node of the representation graph. */ |
12 _Node root; | 12 _Node root; |
13 | 13 |
14 /** Map from anchor names to the most recent Dart node with that anchor. */ | 14 /** Map from anchor names to the most recent Dart node with that anchor. */ |
15 Map<String, Dynamic> anchors; | 15 Map<String, dynamic> anchors; |
16 | 16 |
17 _Constructor(this.root) : this.anchors = {}; | 17 _Constructor(this.root) : this.anchors = {}; |
18 | 18 |
19 /** Runs the Constructor to produce a Dart object. */ | 19 /** Runs the Constructor to produce a Dart object. */ |
20 construct() => root.visit(this); | 20 construct() => root.visit(this); |
21 | 21 |
22 /** Returns the value of a scalar. */ | 22 /** Returns the value of a scalar. */ |
23 visitScalar(_ScalarNode scalar) => scalar.value; | 23 visitScalar(_ScalarNode scalar) => scalar.value; |
24 | 24 |
25 /** Converts a sequence into a List of Dart objects. */ | 25 /** Converts a sequence into a List of Dart objects. */ |
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49 if (anchors.containsKey(anchored.anchor)) return anchors[anchored.anchor]; | 49 if (anchors.containsKey(anchored.anchor)) return anchors[anchored.anchor]; |
50 } | 50 } |
51 | 51 |
52 /** Records that [value] is the Dart object representing [anchored]. */ | 52 /** Records that [value] is the Dart object representing [anchored]. */ |
53 setAnchor(_Node anchored, value) { | 53 setAnchor(_Node anchored, value) { |
54 if (anchored.anchor == null) return value; | 54 if (anchored.anchor == null) return value; |
55 anchors[anchored.anchor] = value; | 55 anchors[anchored.anchor] = value; |
56 return value; | 56 return value; |
57 } | 57 } |
58 } | 58 } |
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