add token to callback

crates/ctranslate2-bindings/include/ctranslate2.h

@@ -7,7 +7,7 @@ namespace tabby {
 
 struct InferenceContext;
 
-typedef rust::Fn<bool(const InferenceContext&, size_t, rust::String)> InferenceCallback;
+typedef rust::Fn<bool(InferenceContext&, size_t, uint32_t, rust::String)> InferenceCallback;
 
 class TextInferenceEngine {
  public:

crates/ctranslate2-bindings/src/ctranslate2.cc

@@ -65,7 +65,7 @@ class EncoderDecoderImpl : public TextInferenceEngineImpl<ctranslate2::Translato
     x.sampling_temperature = options.sampling_temperature;
     x.beam_size = 1;
     x.callback = [&](ctranslate2::GenerationStepResult result) {
-      return callback(*context, result.step, rust::String(result.token));
+      return callback(*context, result.step, result.token_id, result.token);
     };
     ctranslate2::TranslationResult result = model_->translate_batch({ tokens }, x)[0];
     return std::move(result.output());
@@ -85,7 +85,7 @@ class DecoderImpl : public TextInferenceEngineImpl<ctranslate2::Generator, Decod
     x.sampling_temperature = options.sampling_temperature;
     x.beam_size = 1;
     x.callback = [&](ctranslate2::GenerationStepResult result) {
-      return callback(*context, result.step, rust::String(result.token));
+      return callback(*context, result.step, result.token_id, result.token);
     };
     ctranslate2::GenerationResult result = model_->generate_batch_async({ tokens }, x)[0].get();
     return std::move(result.sequences[0]);

crates/ctranslate2-bindings/src/lib.rs

@@ -27,9 +27,11 @@ mod ffi {
             &self,
             context: Box<InferenceContext>,
             callback: fn(
-                &InferenceContext,
+                &mut InferenceContext,
                 // step
                 usize,
+                // token_id
+                u32,
                 // token
                 String,
             ) -> bool,
@@ -67,7 +69,16 @@ pub struct TextInferenceOptions {
     sampling_temperature: f32,
 }
 
-pub struct InferenceContext(CancellationToken);
+pub struct InferenceContext {
+    cancel: CancellationToken,
+    output_text: String
+}
+
+impl InferenceContext {
+    fn new(cancel: CancellationToken) -> Self {
+        InferenceContext { cancel, output_text: "".to_owned() }
+    }
+}
 
 pub struct TextInferenceEngine {
     engine: cxx::SharedPtr<ffi::TextInferenceEngine>,
@@ -97,7 +108,7 @@ impl TextInferenceEngine {
         let cancel_for_inference = cancel.clone();
         let _guard = cancel.drop_guard();
 
-        let context = InferenceContext(cancel_for_inference);
+        let context = InferenceContext::new(cancel_for_inference);
         let output_tokens = tokio::task::spawn_blocking(move || {
             let context = Box::new(context);
             engine.inference(
@@ -124,8 +135,9 @@ impl TextInferenceEngine {
     }
 }
 
-fn inference_callback(context: &InferenceContext, step: usize, token: String) -> bool {
-    if context.0.is_cancelled() {
+fn inference_callback(context: &mut InferenceContext, _step: usize, _token_id: u32, token: String) -> bool {
+    context.output_text.push_str(&token);
+    if context.cancel.is_cancelled() {
         true
     } else {
         false