formatToolsPromptWithFormat method

String formatToolsPromptWithFormat(String toolsJson, String formatName)

Format tool definitions into a system prompt using C++ implementation with a specific format.

toolsJson JSON array of tool definitions formatName Format name ("default", "lfm2") Returns formatted system prompt string

Implementation

String formatToolsPromptWithFormat(String toolsJson, String formatName) {
  if (toolsJson.isEmpty || toolsJson == '[]') {
    return '';
  }

  try {
    final formatFn = lib.lookupFunction<
        Int32 Function(Pointer<Utf8>, Pointer<Utf8>, Pointer<Pointer<Utf8>>),
        int Function(Pointer<Utf8>, Pointer<Utf8>, Pointer<Pointer<Utf8>>)>(
      'rac_tool_call_format_prompt_json_with_format_name',
    );

    final racFreeFn = lib.lookupFunction<Void Function(Pointer<Void>),
        void Function(Pointer<Void>)>('rac_free');

    final toolsPtr = toolsJson.toNativeUtf8();
    final formatPtr = formatName.toNativeUtf8();
    final promptPtrPtr = calloc<Pointer<Utf8>>();

    try {
      final rc = formatFn(toolsPtr, formatPtr, promptPtrPtr);

      if (rc != RAC_SUCCESS || promptPtrPtr.value == nullptr) {
        _logger.error('formatToolsPromptWithFormat C++ returned error: $rc');
        return formatToolsPrompt(toolsJson); // Fallback to default
      }

      final result = promptPtrPtr.value.toDartString();
      racFreeFn(promptPtrPtr.value.cast());
      return result;
    } finally {
      calloc.free(toolsPtr);
      calloc.free(formatPtr);
      calloc.free(promptPtrPtr);
    }
  } catch (e) {
    _logger.error('formatToolsPromptWithFormat failed: $e');
    return formatToolsPrompt(toolsJson); // Fallback to default
  }
}