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Add C# binding for GetNextTokens #1865

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Merged
kunal-vaishnavi merged 5 commits into from
Nov 12, 2025
Merged

Add C# binding for GetNextTokens #1865

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73e7ef9
Add C# API for GetNextTokens
kunal-vaishnavi Nov 12, 2025
e4e2523
Add native methods call
kunal-vaishnavi Nov 12, 2025
a56003c
Remove extra newline
kunal-vaishnavi Nov 12, 2025
8f1f2ef
Use GetNextTokens in C# examples
kunal-vaishnavi Nov 12, 2025
5dde034
Merge branch 'main' into kvaishnavi/get-next-token
kunal-vaishnavi Nov 12, 2025
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4 changes: 2 additions & 2 deletions examples/csharp/HelloPhi/Program.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -158,7 +158,7 @@ static string GetPrompt(bool interactive)
while (!generator.IsDone())
{
generator.GenerateNextToken();
Console.Write(tokenizerStream.Decode(generator.GetSequence(0)[^1]));
Console.Write(tokenizerStream.Decode(generator.GetNextTokens()[0]));
}
Console.WriteLine();
watch.Stop();
Expand Down Expand Up @@ -195,7 +195,7 @@ static string GetPrompt(bool interactive)
while (!generator.IsDone())
{
generator.GenerateNextToken();
Console.Write(tokenizerStream.Decode(generator.GetSequence(0)[^1]));
Console.Write(tokenizerStream.Decode(generator.GetNextTokens()[0]));
}
Console.WriteLine();
watch.Stop();
Expand Down
2 changes: 1 addition & 1 deletion examples/csharp/HelloPhi3V/Program.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -175,7 +175,7 @@ void PrintUsage()
{
break;
}
Console.Write(stream.Decode(generator.GetSequence(0)[^1]));
Console.Write(stream.Decode(generator.GetNextTokens()[0]));
}
watch.Stop();
var runTimeInSeconds = watch.Elapsed.TotalSeconds;
Expand Down
2 changes: 1 addition & 1 deletion examples/csharp/HelloPhi4MM/Program.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -222,7 +222,7 @@ void PrintUsage()
{
break;
}
Console.Write(stream.Decode(generator.GetSequence(0)[^1]));
Console.Write(stream.Decode(generator.GetNextTokens()[0]));
}
watch.Stop();
var runTimeInSeconds = watch.Elapsed.TotalSeconds;
Expand Down
9 changes: 9 additions & 0 deletions src/csharp/Generator.cs
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Expand Up @@ -61,6 +61,15 @@ public void RewindTo(ulong newLength)
Result.VerifySuccess(NativeMethods.OgaGenerator_RewindTo(_generatorHandle, (UIntPtr)newLength));
}

public ReadOnlySpan<int> GetNextTokens()
{
Result.VerifySuccess(NativeMethods.OgaGenerator_GetNextTokens(_generatorHandle, out IntPtr tokenIds, out UIntPtr tokenCount));
unsafe
{
return new ReadOnlySpan<int>(tokenIds.ToPointer(), (int)tokenCount.ToUInt64());
}
}

public ReadOnlySpan<int> GetSequence(ulong index)
{
ulong sequenceLength = NativeMethods.OgaGenerator_GetSequenceCount(_generatorHandle, (UIntPtr)index).ToUInt64();
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5 changes: 5 additions & 0 deletions src/csharp/NativeMethods.cs
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Expand Up @@ -125,6 +125,11 @@ internal class NativeLib
[DllImport(NativeLib.DllName, CallingConvention = CallingConvention.Winapi)]
public static extern byte OgaGenerator_IsDone(IntPtr /* const OgaGenerator* */ generator);

[DllImport(NativeLib.DllName, CallingConvention = CallingConvention.Winapi)]
public static extern IntPtr /* OgaResult* */ OgaGenerator_GetNextTokens(IntPtr /* const OgaGenerator* */ generator,
out IntPtr /* const int32_t** */ outTokenIds,
out UIntPtr /* size_t* */ outTokenCount);

// This function is used to generate the next token in the sequence using the greedy search algorithm.
[DllImport(NativeLib.DllName, CallingConvention = CallingConvention.Winapi)]
public static extern IntPtr /* OgaResult* */ OgaGenerator_GenerateNextToken(IntPtr /* OgaGenerator* */ generator);
Expand Down
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