private static ManagedArg GetManagedArg(NativeArg nativeArg, int argCount, string funcName)
{
var name = nativeArg.Name.OrElse(null)
?? GuessOptionSetArgName(nativeArg, argCount, funcName)
?? GuessManagedArgNameForArg(nativeArg)
?? $"p{nativeArg.Index}";
if (nativeArg.IsDelegate)
{
var argsLength = FindClosingParenthesis(nativeArg.NativeType, 1) - 1;
var funcArgsUnparsed = nativeArg.NativeType.Substring(1, argsLength);
var nativeReturnType = nativeArg.NativeType.Substring(1 + argsLength + ") -> ".Length);
var delegateNativeArgs = ParseNativeArgs(funcArgsUnparsed).ToList();
var delegateManagedArgs = delegateNativeArgs.Select(dna => GetManagedArg(dna, delegateNativeArgs.Count, $"{funcName}_{name}"));
var delegateManagedArgsString = string.Join(", ", delegateManagedArgs.Select(dma => dma.Variations.First()));
var delegateManagedReturnType = GetManagedType(nativeReturnType);
var managedType = $"({delegateManagedArgsString}) -> {delegateManagedReturnType}";
return(new ManagedArg(
new[]
{
new ManagedArgVariation("delegate_ptr", name, "default"),
new ManagedArgVariation(managedType, name, "delegate"),
}
));
}
else
{
var managedTypes = GetManagedTypeOverride(nativeArg, argCount, funcName) ?? GetManagedTypeVariations(nativeArg, name);
return(new ManagedArg(managedTypes.Select(mt => new ManagedArgVariation(mt.Type, name, mt.Strategy))));
}
}
private static string GuessOptionSetArgName(NativeArg nativeArg, int argCount, string funcName)
{
return
// second arg in a set operation that has 2 args
// or first arg in a set operation that has one arg which is not a pointer
((nativeArg.Index == 1 && argCount == 2 && funcName != null) || (nativeArg.Index == 0 && argCount == 1 && !nativeArg.NativeType.EndsWith("*")) ? RocksDbOptionSetPattern.Match(funcName).If(m => m.Success)?.Groups[1].Value :
null);
}
/* Sometimes we can't determine the appropriate type automatically and we just have to override it
* These are the function/argname:type -> managed type mappings
*/
private static IEnumerable <(string Type, string Strategy)> OverrideType(NativeArg arg, int argCount, string funcName)
{
// The Strategy returned allows multiple overloads for a function.
// In general, just pass "default" unless you need to ensure multiple overloads
// "keys" and "values" in "options" functions are strings
if (funcName.IsMatchedBy(@".*options.*") && arg.Name.IsMatchedBy("keys|values") && arg.NativeType.IsMatchedBy(@".*\*\*|.*\* const\*"))
{
yield return("string[]", "default");
}
// Some options take enumerations as values
if (funcName == "rocksdb_options_set_compression_per_level" && arg.Name == "level_values")
{
yield return("Compression[]", "enum");
yield return("int[]", "default");
}
if (funcName == "rocksdb_options_set_compression" && arg.NativeType == "int")
{
yield return("Compression", "enum");
yield return("int", "default");
}
if (funcName == "rocksdb_options_set_compaction_style" && arg.NativeType == "int")
{
yield return("Compaction", "enum");
yield return("int", "default");
}
if (funcName == "rocksdb_options_set_wal_recovery_mode" && arg.NativeType == "int")
{
yield return("Recovery", "enum");
yield return("int", "default");
}
if (funcName == "rocksdb_block_based_options_set_index_type" && arg.NativeType == "int")
{
yield return("BlockBasedTableIndexType", "enum");
yield return("int", "default");
}
if (funcName == "rocksdb_set_perf_level" && arg.NativeType == "int")
{
yield return("PerfLevel", "enum");
yield return("int", "default");
}
if (funcName == "rocksdb_perfcontext_metric" && arg.NativeType == "int")
{
yield return("PerfMetric", "enum");
yield return("int", "default");
}
yield break;
}
private static string GetManagedType(NativeArg nativeArg)
{
if (nativeArg.Name == "errptr" && nativeArg.NativeType == "char**")
{
return("out char_ptr_ptr");
}
if (nativeArg.Name == "errs" && nativeArg.NativeType == "char**")
{
return("char_ptr[]");
}
if (nativeArg.Name.IsMatchedBy(@"len.*|size|.*len") && nativeArg.NativeType == "size_t*")
{
return("out size_t");
}
if (nativeArg.Name == "file_list" && nativeArg.NativeType == "const char* const*")
{
return("string[]");
}
return(GetManagedType(nativeArg.NativeType));
}
private static string GuessManagedArgNameForArg(NativeArg nativeArg)
{
return(RocksDbStructPtrPattern.Match(nativeArg.NativeType).If(m => m.Success)?.Groups[1].Value
?? nativeArg.NativeType.If(t => t == "size_t").Then(t => "size"));
}
private static IEnumerable <(string Type, string Strategy)> GetManagedTypeOverride(NativeArg nativeArg, int argCount, string funcName)
{
var overrides = OverrideType(nativeArg, argCount, funcName).ToList();
return((overrides.Count > 0) ? overrides : null);
}
private static IEnumerable <(string Type, string Strategy)> GetManagedTypeVariations(NativeArg nativeArg, string managedArgName)
{
// Note: the managedArgName can be convenient since a native arg name is not always supplied
yield return(Type : GetManagedType(nativeArg), Strategy : "default");
if (managedArgName.IsMatchedBy(".*name|name.*|.*dir|.*path") && nativeArg.NativeType == "const char*")
{
yield return(Type : "string", Strategy : "string name");
}
if (nativeArg.Name.IsMatchedBy(".*names|names.*") && nativeArg.NativeType == "const char**")
{
yield return(Type : "string[]", Strategy : "array");
}
if (nativeArg.Name.IsMatchedBy(".*column_famil.*|iterators") && nativeArg.NativeType.EndsWith("**"))
{
yield return(Type : $"{AsArrayType(GetManagedType(nativeArg.NativeType))}", Strategy : "array");
}
if (nativeArg.Name.IsMatchedBy(@"key|k|val|v|.*_key|.*_val") && nativeArg.NativeType.In("const char*", "char*"))
{
yield return(Type : "byte*", Strategy : "kv byte*");
yield return(Type : "byte[]", Strategy : "kv byte[]");
}
if (nativeArg.Name.IsMatchedBy(@"rep") && nativeArg.NativeType.In("const char*", "char*"))
{
yield return(Type : "byte*", Strategy : "rep byte*");
yield return(Type : "byte[]", Strategy : "rep byte[]");
}
if (nativeArg.Name.IsMatchedBy(@"blob") && nativeArg.NativeType.In("const char*", "char*"))
{
yield return(Type : "byte*", Strategy : "blob byte*");
yield return(Type : "byte[]", Strategy : "blob byte[]");
}
if (nativeArg.Name.ToLower().EndsWith("list") && nativeArg.NativeType.In("const char* const*", "char**"))
{
yield return(Type : "IntPtr[]", Strategy : "array");
}
if (nativeArg.Name.ToLower().EndsWith("sizes") && nativeArg.NativeType.In("const size_t*", "size_t*"))
{
yield return(Type : "size_t[]", Strategy : "array");
}
if (nativeArg.Name == "column_families" && nativeArg.NativeType == "const rocksdb_column_family_handle_t* const*")
{
yield return(Type : "rocksdb_column_family_handle_t_ptr[]", Strategy : "array");
}
if (nativeArg.Name == "level_values" && nativeArg.NativeType == "int*")
{
yield return(Type : "int[]", Strategy : "array");
}
}