Stop running pub get at gclient sync time and fix build bugs

mojo/public/dart/third_party/yaml/lib/src/yaml_node.dart

+// 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 yaml.yaml_node;
+
+import 'dart:collection' as collection;
+
+import 'package:collection/collection.dart';
+import 'package:source_span/source_span.dart';
+
+import 'null_span.dart';
+import 'style.dart';
+import 'yaml_node_wrapper.dart';
+
+/// An interface for parsed nodes from a YAML source tree.
+///
+/// [YamlMap]s and [YamlList]s implement this interface in addition to the
+/// normal [Map] and [List] interfaces, so any maps and lists will be
+/// [YamlNode]s regardless of how they're accessed.
+///
+/// Scalars values like strings and numbers, on the other hand, don't have this
+/// interface by default. Instead, they can be accessed as [YamlScalar]s via
+/// [YamlMap.nodes] or [YamlList.nodes].
+abstract class YamlNode {
+  /// The source span for this node.
+  ///
+  /// [SourceSpan.message] can be used to produce a human-friendly message about
+  /// this node.
+  SourceSpan get span => _span;
+
+  SourceSpan _span;
+
+  /// The inner value of this node.
+  ///
+  /// For [YamlScalar]s, this will return the wrapped value. For [YamlMap] and
+  /// [YamlList], it will return [this], since they already implement [Map] and
+  /// [List], respectively.
+  get value;
+}
+
+/// A read-only [Map] parsed from YAML.
+class YamlMap extends YamlNode with collection.MapMixin, UnmodifiableMapMixin  {
+  /// A view of [this] where the keys and values are guaranteed to be
+  /// [YamlNode]s.
+  ///
+  /// The key type is `dynamic` to allow values to be accessed using
+  /// non-[YamlNode] keys, but [Map.keys] and [Map.forEach] will always expose
+  /// them as [YamlNode]s. For example, for `{"foo": [1, 2, 3]}` [nodes] will be
+  /// a map from a [YamlScalar] to a [YamlList], but since the key type is
+  /// `dynamic` `map.nodes["foo"]` will still work.
+  final Map<dynamic, YamlNode> nodes;
+
+  /// The style used for the map in the original document.
+  final CollectionStyle style;
+
+  Map get value => this;
+
+  Iterable get keys => nodes.keys.map((node) => node.value);
+
+  /// Creates an empty YamlMap.
+  ///
+  /// This map's [span] won't have useful location information. However, it will
+  /// have a reasonable implementation of [SourceSpan.message]. If [sourceUrl]
+  /// is passed, it's used as the [SourceSpan.sourceUrl].
+  ///
+  /// [sourceUrl] may be either a [String], a [Uri], or `null`.
+  factory YamlMap({sourceUrl}) =>
+      new YamlMapWrapper(const {}, sourceUrl);
+
+  /// Wraps a Dart map so that it can be accessed (recursively) like a
+  /// [YamlMap].
+  ///
+  /// Any [SourceSpan]s returned by this map or its children will be dummies
+  /// without useful location information. However, they will have a reasonable
+  /// implementation of [SourceSpan.getLocationMessage]. If [sourceUrl] is
+  /// passed, it's used as the [SourceSpan.sourceUrl].
+  ///
+  /// [sourceUrl] may be either a [String], a [Uri], or `null`.
+  factory YamlMap.wrap(Map dartMap, {sourceUrl}) =>
+      new YamlMapWrapper(dartMap, sourceUrl);
+
+  /// Users of the library should not use this constructor.
+  YamlMap.internal(Map<dynamic, YamlNode> nodes, SourceSpan span, this.style)
+      : nodes = new UnmodifiableMapView<dynamic, YamlNode>(nodes) {
+    _span = span;
+  }
+
+  operator [](key) {
+    var node = nodes[key];
+    return node == null ? null : node.value;
+  }
+}
+
+// TODO(nweiz): Use UnmodifiableListMixin when issue 18970 is fixed.
+/// A read-only [List] parsed from YAML.
+class YamlList extends YamlNode with collection.ListMixin {
+  final List<YamlNode> nodes;
+
+  /// The style used for the list in the original document.
+  final CollectionStyle style;
+
+  List get value => this;
+
+  int get length => nodes.length;
+
+  set length(int index) {
+    throw new UnsupportedError("Cannot modify an unmodifiable List");
+  }
+
+  /// Creates an empty YamlList.
+  ///
+  /// This list's [span] won't have useful location information. However, it
+  /// will have a reasonable implementation of [SourceSpan.message]. If
+  /// [sourceUrl] is passed, it's used as the [SourceSpan.sourceUrl].
+  ///
+  /// [sourceUrl] may be either a [String], a [Uri], or `null`.
+  factory YamlList({sourceUrl}) =>
+      new YamlListWrapper(const [], sourceUrl);
+
+  /// Wraps a Dart list so that it can be accessed (recursively) like a
+  /// [YamlList].
+  ///
+  /// Any [SourceSpan]s returned by this list or its children will be dummies
+  /// without useful location information. However, they will have a reasonable
+  /// implementation of [SourceSpan.getLocationMessage]. If [sourceUrl] is
+  /// passed, it's used as the [SourceSpan.sourceUrl].
+  ///
+  /// [sourceUrl] may be either a [String], a [Uri], or `null`.
+  factory YamlList.wrap(List dartList, {sourceUrl}) =>
+      new YamlListWrapper(dartList, sourceUrl);
+
+  /// Users of the library should not use this constructor.
+  YamlList.internal(List<YamlNode> nodes, SourceSpan span, this.style)
+      : nodes = new UnmodifiableListView<YamlNode>(nodes) {
+    _span = span;
+  }
+
+  operator [](int index) => nodes[index].value;
+
+  operator []=(int index, value) {
+    throw new UnsupportedError("Cannot modify an unmodifiable List");
+  }
+}
+
+/// A wrapped scalar value parsed from YAML.
+class YamlScalar extends YamlNode {
+  final value;
+
+  /// The style used for the scalar in the original document.
+  final ScalarStyle style;
+
+  /// Wraps a Dart value in a [YamlScalar].
+  ///
+  /// This scalar's [span] won't have useful location information. However, it
+  /// will have a reasonable implementation of [SourceSpan.message]. If
+  /// [sourceUrl] is passed, it's used as the [SourceSpan.sourceUrl].
+  ///
+  /// [sourceUrl] may be either a [String], a [Uri], or `null`.
+  YamlScalar.wrap(this.value, {sourceUrl})
+      : style = ScalarStyle.ANY {
+    _span = new NullSpan(sourceUrl);
+  }
+
+  /// Users of the library should not use this constructor.
+  YamlScalar.internal(this.value, SourceSpan span, this.style) {
+    _span = span;
+  }
+
+  String toString() => value.toString();
+}
+
+/// Sets the source span of a [YamlNode].
+///
+/// This method is not exposed publicly.
+void setSpan(YamlNode node, SourceSpan span) {
+  node._span = span;
+}