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Scripts/Utilities/ExpressionParser/Sprache/StringExtensions.cs

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+using System;
+using System.Collections.Generic;
+using UniLinq;
+
+namespace Sprache
+{
+    internal static class StringExtensions
+    {
+        public static IEnumerable<char> ToEnumerable(this string @this)
+        {
+#if STRING_IS_ENUMERABLE
+            return @this;
+#else
+            if (@this == null) throw new ArgumentNullException(nameof(@this));
+
+            for (var i = 0; i < @this.Length; ++i)
+            {
+                yield return @this[i];
+            }
+#endif
+        }
+
+        public static string Join<T>(string separator, IEnumerable<T> values)
+        {
+#if STRING_JOIN_ENUMERABLE
+            return string.Join(separator, values);
+#else
+            return string.Join(separator, values.Select(v => v.ToString()).ToArray());
+#endif
+        }
+    }
+}