public static string WrapWithThrow(bool isVoid, string name, IEnumerable <string> args)
{
var argList = string.Join("", args.Select(a => $"{a}, "));
var cs = new IndentedCodeBuilder();
cs.StartBlock("{");
cs.AppendLine($"{(isVoid ? "" : "var result = ")}{name}({argList}out char_ptr_ptr errptr);");
cs.AppendLine($"if (errptr != IntPtr.Zero)");
cs.AppendIndentedLine("throw new RocksDbException(errptr);");
if (!isVoid)
{
cs.AppendLine($"return result;");
}
cs.EndBlock("}");
return(cs.ToString());
}
static void Main(string[] args)
{
if (args.Length == 0)
{
Console.Error.WriteLine("Usage: <exe> <version>");
Console.Error.WriteLine(" Where <exe> is this executable and <version> is something like v5.18.3");
return;
}
var version = args[0];
// Download the original by commit id
var urlOfCHeader = $"https://raw.githubusercontent.com/facebook/rocksdb/{version}/include/rocksdb/c.h";
var original = Download(urlOfCHeader);
Console.Error.WriteLine($"Using: {urlOfCHeader}");
// Transform from CRLF to LF
var modified = original.Replace("\r\n", "\n");
var regions = ParseRocksHeaderFileRegion(modified).ToList();
var managedFunctions = regions.ToDictionary(r => r.Title, r => GetManagedFunctions(r).ToArray());
var nativeRawCs = new IndentedCodeBuilder();
nativeRawCs.AppendLine($"/* WARNING: This file was autogenerated from version {version} of rocksdb/c.h at");
nativeRawCs.AppendLine($" {urlOfCHeader}");
nativeRawCs.AppendLine($" */");
nativeRawCs.AppendLine(GetCsharpHeader());
nativeRawCs.AppendLine("namespace RocksDbSharp");
nativeRawCs.StartBlock("{");
nativeRawCs.AppendLine("#region Type aliases");
// Get every type in use as an argument type or a return type
var typeVariations = managedFunctions
.SelectMany(rmf => rmf.Value)
.SelectMany(mf =>
mf.ReturnType.Once()
.Concat(mf.Args
.SelectMany(mfa => mfa.Variations.Where(mfav => mfav.TypeStrategy != "delegate"))
.Select(mfav => mfav.Type)
)
)
.Select(v => Regex.Replace(v, @"\[\]$", ""))
.ToHashSet();
foreach (var typeAlias in GetTypeAliases(regions))
{
// Find all the variations that are actually in use and include those
foreach (var typeVariation in typeVariations.Where(tv => tv.Contains(typeAlias.Name)))
{
nativeRawCs.AppendLine(typeAlias.Variation(typeVariation));
}
}
nativeRawCs.AppendLine("#endregion");
nativeRawCs.AppendLine("#region Delegates");
var delegateSignatures = managedFunctions
.SelectMany(rmf => rmf.Value)
.SelectMany(mf => mf.Args.Select(mfa => (FuncName: mf.Name.RegexReplace(@"^rocksdb_|_create$", ""), Arg: mfa)))
.SelectMany(mfa => mfa.Arg.Variations
.Where(mfav => mfav.TypeStrategy == "delegate")
.Select(mfav => (mfa.FuncName, mfav.Type, ArgName: mfav.Name))
)
.ToList();
var delegatesByName = delegateSignatures.GroupBy(ds => ds.ArgName);
foreach (var nameGroup in delegatesByName)
{
var unique = nameGroup.Select(ng => ng.Type).Distinct();
if (unique.Count() == 1)
{
var definition = nameGroup.First();
var parsed = Regex.Match(definition.Type, @"^\((.*?)\) -> (.+)$");
var delegateReturnType = parsed.Groups[2].Value;
var delegateSignature = parsed.Groups[1].Value;
var delegateName = nameGroup.Key;
var name = $"{SnakeCaseToPascalCase(delegateName)}Delegate";
nativeRawCs.AppendLine($"public delegate {delegateReturnType} {name}({delegateSignature});");
}
else
{
nativeRawCs.AppendLine("// If you get the below error, then that means the c.h file in the rocksdb project");
nativeRawCs.AppendLine("// now contains delegate arguments which share a name, but have different signatures.");
nativeRawCs.AppendLine("// The code generator will need logic to try to generate different names for the");
nativeRawCs.AppendLine("// different arguments");
nativeRawCs.AppendLine(string.Join("", nameGroup.Select((ng, i) => $" Arg {i + 1}: {ng.ArgName} in {ng.FuncName} with signature {ng.Type}\n")));
nativeRawCs.AppendLineWithoutIndent($"#error Unable to create single delegate because arguments named {nameGroup.Key} have different delegate signatures");
}
}
nativeRawCs.AppendLine("#endregion");
foreach (var region in regions.Where(r => (r.NativeEnums.Length + r.NativeFunctions.Length) > 0))
{
nativeRawCs.AppendLine($"#region {region.Title}");
foreach (var managedEnum in GetManagedEnums(region))
{
nativeRawCs.AppendLine(managedEnum);
}
nativeRawCs.AppendLine($"public partial class Native");
nativeRawCs.StartBlock("{");
foreach (var managedFunction in managedFunctions[region.Title])
{
nativeRawCs.AppendLine(managedFunction.WithTypeLookup((name, type, strategy) => strategy == "delegate" ? $"{SnakeCaseToPascalCase(name)}Delegate" : type));
}
nativeRawCs.EndBlock($"}} // class Native");
nativeRawCs.AppendLine($"#endregion // {region.Title}");
}
nativeRawCs.EndBlock("} // namespace RocksDbSharp");
var output = nativeRawCs.ToString();
Console.WriteLine(output);
Console.Error.WriteLine($"Done");
}