Merge pull request #927 from lahma/optimize-scalar-load

Optimize YamlScalarNode.Load and YamlMappingNode.Load

YamlDotNet.Benchmark/YamlStreamBenchmark.cs

@@ -19,7 +19,6 @@
 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 // SOFTWARE.
 
-using System.IO.Compression;
 using BenchmarkDotNet.Attributes;
 using YamlDotNet.RepresentationModel;
 
@@ -33,7 +32,7 @@ public class YamlStreamBenchmark
     [GlobalSetup]
     public void Setup()
     {
-        using var reader = new StreamReader(new GZipStream(File.OpenRead("Resources/saltern.yml.gz"), CompressionMode.Decompress));
+        using var reader = new StreamReader(File.OpenRead("Resources/saltern.yml"));
         yamlString = reader.ReadToEnd();
     }
 

YamlDotNet/Helpers/DictionaryExtensions.cs

@@ -0,0 +1,39 @@
+// 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.Helpers
+{
+    internal static class DictionaryExtensions
+    {
+#if NETSTANDARD2_0 || NETFRAMEWORK
+    public static bool TryAdd<T, V>(this System.Collections.Generic.Dictionary<T, V> dictionary, T key, V value)
+    {
+        if (dictionary.ContainsKey(key))
+        {
+            return false;
+        }
+
+        dictionary.Add(key, value);
+        return true;
+    }
+#endif
+    }
+}