extractJson method

String? extractJson(String text)

Extract JSON from generated text Uses C++ rac_structured_output_extract_json

Implementation

String? extractJson(String text) {
  final textPtr = text.toNativeUtf8();
  final jsonPtrPtr = calloc<Pointer<Utf8>>();

  try {
    final lib = PlatformLoader.loadCommons();
    final extractJsonFn = lib.lookupFunction<
        Int32 Function(Pointer<Utf8>, Pointer<Pointer<Utf8>>, Pointer<Void>),
        int Function(Pointer<Utf8>, Pointer<Pointer<Utf8>>,
            Pointer<Void>)>('rac_structured_output_extract_json');

    final result = extractJsonFn(textPtr, jsonPtrPtr, nullptr);

    if (result != RAC_SUCCESS) {
      _logger.warning('extractJson failed with code $result');
      return _fallbackExtractJson(text);
    }

    final jsonPtr = jsonPtrPtr.value;
    if (jsonPtr == nullptr) {
      return _fallbackExtractJson(text);
    }

    final jsonString = jsonPtr.toDartString();
    lib.lookupFunction<Void Function(Pointer<Void>),
        void Function(Pointer<Void>)>('rac_free')(jsonPtr.cast<Void>());

    return jsonString;
  } catch (e) {
    _logger.error('extractJson exception: $e');
    return _fallbackExtractJson(text);
  } finally {
    calloc.free(textPtr);
    calloc.free(jsonPtrPtr);
  }
}