libs.capnproto-dotnetcore_Runtime/CapnpC.CSharp.Generator/Model/IdentifierRenamer.cs

using Microsoft.CodeAnalysis.CSharp;
using System;
using System.Collections.Generic;
using System.Text;

namespace CapnpC.CSharp.Generator.Model
{
    public class IdentifierRenamer
    {
        public static bool IsAnyKeyword(string str)
        {
            return SyntaxFacts.GetKeywordKind(str) != SyntaxKind.None
                 || SyntaxFacts.GetContextualKeywordKind(str) != SyntaxKind.None;
        }
        public static string ToNonKeyword(string str)
        {
            // Capnp schema identifiers should be already valid, but could be a keyword
            if (IsAnyKeyword(str)) return $"@{str}";
            return str;
        }
    }
}