WORD Scraper::attributesMask()

in src/agent/Scraper.cc [397:432]

• 29 lines of code
• 12 McCabe index (conditional complexity)

WORD Scraper::attributesMask()
{
    const auto WINPTY_ENABLE_VIRTUAL_TERMINAL_PROCESSING = 0x4u;
    const auto WINPTY_ENABLE_LVB_GRID_WORLDWIDE          = 0x10u;
    const auto WINPTY_COMMON_LVB_REVERSE_VIDEO           = 0x4000u;
    const auto WINPTY_COMMON_LVB_UNDERSCORE              = 0x8000u;

    const auto cp = GetConsoleOutputCP();
    const auto isCjk = (cp == 932 || cp == 936 || cp == 949 || cp == 950);

    const DWORD outputMode = [this]{
        ASSERT(this->m_consoleBuffer != nullptr);
        DWORD mode = 0;
        if (!GetConsoleMode(this->m_consoleBuffer->conout(), &mode)) {
            mode = 0;
        }
        return mode;
    }();
    const bool hasEnableLvbGridWorldwide =
        (outputMode & WINPTY_ENABLE_LVB_GRID_WORLDWIDE) != 0;
    const bool hasEnableVtProcessing =
        (outputMode & WINPTY_ENABLE_VIRTUAL_TERMINAL_PROCESSING) != 0;

    // The new Windows 10 console (as of 14393) seems to respect
    // COMMON_LVB_REVERSE_VIDEO even in CP437 w/o the other enabling modes, so
    // try to match that behavior.
    const auto isReverseSupported =
        isCjk || hasEnableLvbGridWorldwide || hasEnableVtProcessing || m_console.isNewW10();
    const auto isUnderscoreSupported =
        isCjk || hasEnableLvbGridWorldwide || hasEnableVtProcessing;

    WORD mask = ~0;
    if (!isReverseSupported)    { mask &= ~WINPTY_COMMON_LVB_REVERSE_VIDEO; }
    if (!isUnderscoreSupported) { mask &= ~WINPTY_COMMON_LVB_UNDERSCORE; }
    return mask;
}