Import YamlDotNet.

Assets/YamlDotNet/Core/StringLookAheadBuffer.cs

@@ -0,0 +1,61 @@
+// 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;
+
+namespace YamlDotNet.Core
+{
+    internal sealed class StringLookAheadBuffer : ILookAheadBuffer
+    {
+        private readonly string value;
+
+        public int Position { get; private set; }
+
+        public StringLookAheadBuffer(string value)
+        {
+            this.value = value;
+        }
+
+        public int Length => value.Length;
+
+        public bool EndOfInput => IsOutside(Position);
+
+        public char Peek(int offset)
+        {
+            var index = Position + offset;
+            return IsOutside(index) ? '\0' : value[index];
+        }
+
+        private bool IsOutside(int index)
+        {
+            return index >= value.Length;
+        }
+
+        public void Skip(int length)
+        {
+            if (length < 0)
+            {
+                throw new ArgumentOutOfRangeException(nameof(length), "The length must be positive.");
+            }
+            Position += length;
+        }
+    }
+}