Import YamlDotNet.

Assets/YamlDotNet/Core/Events/ParsingEvent.cs

@@ -0,0 +1,68 @@
+// 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.
+
+namespace YamlDotNet.Core.Events
+{
+    /// <summary>
+    /// Base class for parsing events.
+    /// </summary>
+    public abstract class ParsingEvent
+    {
+        /// <summary>
+        /// Gets a value indicating the variation of depth caused by this event.
+        /// The value can be either -1, 0 or 1. For start events, it will be 1,
+        /// for end events, it will be -1, and for the remaining events, it will be 0.
+        /// </summary>
+        public virtual int NestingIncrease => 0;
+
+        /// <summary>
+        /// Gets the event type, which allows for simpler type comparisons.
+        /// </summary>
+        internal abstract EventType Type { get; }
+
+        /// <summary>
+        /// Gets the position in the input stream where the event starts.
+        /// </summary>
+        public Mark Start { get; }
+
+        /// <summary>
+        /// Gets the position in the input stream where the event ends.
+        /// </summary>
+        public Mark End { get; }
+
+        /// <summary>
+        /// Accepts the specified visitor.
+        /// </summary>
+        /// <param name="visitor">Visitor to accept, may not be null</param>
+        public abstract void Accept(IParsingEventVisitor visitor);
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="ParsingEvent"/> class.
+        /// </summary>
+        /// <param name="start">The start position of the event.</param>
+        /// <param name="end">The end position of the event.</param>
+        internal ParsingEvent(Mark start, Mark end)
+        {
+            this.Start = start ?? throw new System.ArgumentNullException(nameof(start));
+            this.End = end ?? throw new System.ArgumentNullException(nameof(end));
+        }
+    }
+}