Import YamlDotNet.

Assets/YamlDotNet/RepresentationModel/DocumentLoadingState.cs

@@ -0,0 +1,111 @@
+// This file is part of YamlDotNet - A .NET library for YAML.
+// Copyright (c) Antoine Aubry and contributors
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy of
+// this software and associated documentation files (the "Software"), to deal in
+// the Software without restriction, including without limitation the rights to
+// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+// of the Software, and to permit persons to whom the Software is furnished to do
+// so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+using System;
+using System.Collections.Generic;
+using System.Diagnostics.CodeAnalysis;
+using YamlDotNet.Core;
+
+namespace YamlDotNet.RepresentationModel
+{
+    /// <summary>
+    /// Manages the state of a <see cref="YamlDocument" /> while it is loading.
+    /// </summary>
+    internal class DocumentLoadingState
+    {
+        private readonly IDictionary<AnchorName, YamlNode> anchors = new Dictionary<AnchorName, YamlNode>();
+        private readonly IList<YamlNode> nodesWithUnresolvedAliases = new List<YamlNode>();
+
+        /// <summary>
+        /// Adds the specified node to the anchor list.
+        /// </summary>
+        /// <param name="node">The node.</param>
+        public void AddAnchor(YamlNode node)
+        {
+            if (node.Anchor.IsEmpty)
+            {
+                throw new ArgumentException("The specified node does not have an anchor");
+            }
+
+            if (anchors.ContainsKey(node.Anchor))
+            {
+                anchors[node.Anchor] = node;
+            }
+            else
+            {
+                anchors.Add(node.Anchor, node);
+            }
+        }
+
+        /// <summary>
+        /// Gets the node with the specified anchor.
+        /// </summary>
+        /// <param name="anchor">The anchor.</param>
+        /// <param name="start">The start position.</param>
+        /// <param name="end">The end position.</param>
+        /// <returns></returns>
+        /// <exception cref="AnchorNotFoundException">if there is no node with that anchor.</exception>
+        public YamlNode GetNode(AnchorName anchor, Mark start, Mark end)
+        {
+            if (anchors.TryGetValue(anchor, out var target))
+            {
+                return target;
+            }
+            else
+            {
+                throw new AnchorNotFoundException(start, end, $"The anchor '{anchor}' does not exists");
+            }
+        }
+
+        /// <summary>
+        /// Gets the node with the specified anchor.
+        /// </summary>
+        /// <param name="anchor">The anchor.</param>
+        /// <param name="node">The node that was retrieved.</param>
+        /// <returns>true if the anchor was found; otherwise false.</returns>
+        public bool TryGetNode(AnchorName anchor, [NotNullWhen(true)] out YamlNode? node)
+        {
+            return anchors.TryGetValue(anchor, out node);
+        }
+
+        /// <summary>
+        /// Adds the specified node to the collection of nodes with unresolved aliases.
+        /// </summary>
+        /// <param name="node">
+        /// The <see cref="YamlNode"/> that has unresolved aliases.
+        /// </param>
+        public void AddNodeWithUnresolvedAliases(YamlNode node)
+        {
+            nodesWithUnresolvedAliases.Add(node);
+        }
+
+        /// <summary>
+        /// Resolves the aliases that could not be resolved while loading the document.
+        /// </summary>
+        public void ResolveAliases()
+        {
+            foreach (var node in nodesWithUnresolvedAliases)
+            {
+                node.ResolveAliases(this);
+            }
+        }
+    }
+}