Refactor polyfills

CliFx/Utils/Polyfills.Collections.cs

@@ -0,0 +1,26 @@
+// ReSharper disable CheckNamespace
+
+#if NETSTANDARD2_0
+using System.Collections.Generic;
+
+internal static class CollectionPolyfills
+{
+    public static void Deconstruct<TKey, TValue>(this KeyValuePair<TKey, TValue> pair, out TKey key, out TValue value)
+    {
+        key = pair.Key;
+        value = pair.Value;
+    }
+
+    public static TValue GetValueOrDefault<TKey, TValue>(this IReadOnlyDictionary<TKey, TValue> dic, TKey key) =>
+        dic.TryGetValue(key!, out var result) ? result! : default!;
+}
+
+namespace System.Linq
+{
+    internal static class LinqPolyfills
+    {
+        public static HashSet<T> ToHashSet<T>(this IEnumerable<T> source, IEqualityComparer<T> comparer) =>
+            new(source, comparer);
+    }
+}
+#endif

CliFx/Utils/Polyfills.Streams.cs

@@ -0,0 +1,11 @@
+// ReSharper disable CheckNamespace
+
+#if NETSTANDARD2_0
+using System.IO;
+
+internal static class StreamPolyfills
+{
+    public static void Write(this Stream stream, byte[] buffer) =>
+        stream.Write(buffer, 0, buffer.Length);
+}
+#endif

CliFx/Utils/Polyfills.Strings.cs

@@ -0,0 +1,12 @@
+// ReSharper disable CheckNamespace
+
+#if NETSTANDARD2_0
+internal static class StringPolyfills
+{
+    public static bool StartsWith(this string str, char c) =>
+        str.Length > 0 && str[0] == c;
+
+    public static bool EndsWith(this string str, char c) =>
+        str.Length > 0 && str[str.Length - 1] == c;
+}
+#endif

CliFx/Utils/Polyfills.cs

@@ -1,52 +0,0 @@
-// ReSharper disable CheckNamespace
-
-#if NETSTANDARD2_0
-using System;
-using System.Collections.Generic;
-using System.IO;
-
-internal static partial class PolyfillExtensions
-{
-    public static bool StartsWith(this string str, char c) =>
-        str.Length > 0 && str[0] == c;
-
-    public static bool EndsWith(this string str, char c) =>
-        str.Length > 0 && str[str.Length - 1] == c;
-
-    public static string[] Split(this string str, char separator, StringSplitOptions splitOptions) =>
-        str.Split(new[] {separator}, splitOptions);
-}
-
-internal static partial class PolyfillExtensions
-{
-    public static void Deconstruct<TKey, TValue>(this KeyValuePair<TKey, TValue> pair, out TKey key, out TValue value)
-    {
-        key = pair.Key;
-        value = pair.Value;
-    }
-}
-
-internal static partial class PolyfillExtensions
-{
-    public static void Write(this Stream stream, byte[] buffer) =>
-        stream.Write(buffer, 0, buffer.Length);
-}
-
-namespace System.Linq
-{
-    internal static class PolyfillExtensions
-    {
-        public static HashSet<T> ToHashSet<T>(this IEnumerable<T> source, IEqualityComparer<T> comparer) =>
-            new(source, comparer);
-    }
-}
-
-namespace System.Collections.Generic
-{
-    internal static class PolyfillExtensions
-    {
-        public static TValue GetValueOrDefault<TKey, TValue>(this IReadOnlyDictionary<TKey, TValue> dic, TKey key) =>
-            dic.TryGetValue(key!, out var result) ? result! : default!;
-    }
-}
-#endif