func()

in winterm/win_event_handler.go [203:283]
70 lines of code
22 McCabe index (conditional complexity)

func (h *windowsAnsiEventHandler) Execute(b byte) error {
	switch b {
	case ansiterm.ANSI_TAB:
		h.logf("Execute(TAB)")
		// Move to the next tab stop, but preserve auto-wrap if already set.
		if !h.wrapNext {
			pos, info, err := h.getCurrentInfo()
			if err != nil {
				return err
			}
			pos.X = (pos.X + 8) - pos.X%8
			if pos.X >= info.Size.X {
				pos.X = info.Size.X - 1
			}
			if err := h.Flush(); err != nil {
				return err
			}
			if err := SetConsoleCursorPosition(h.fd, pos); err != nil {
				return err
			}
		}
		return nil

	case ansiterm.ANSI_BEL:
		h.buffer.WriteByte(ansiterm.ANSI_BEL)
		return nil

	case ansiterm.ANSI_BACKSPACE:
		if h.wrapNext {
			if err := h.Flush(); err != nil {
				return err
			}
			h.clearWrap()
		}
		pos, _, err := h.getCurrentInfo()
		if err != nil {
			return err
		}
		if pos.X > 0 {
			pos.X--
			h.updatePos(pos)
			h.buffer.WriteByte(ansiterm.ANSI_BACKSPACE)
		}
		return nil

	case ansiterm.ANSI_VERTICAL_TAB, ansiterm.ANSI_FORM_FEED:
		// Treat as true LF.
		return h.executeLF()

	case ansiterm.ANSI_LINE_FEED:
		// Simulate a CR and LF for now since there is no way in go-ansiterm
		// to tell if the LF should include CR (and more things break when it's
		// missing than when it's incorrectly added).
		handled, err := h.simulateLF(true)
		if handled || err != nil {
			return err
		}
		return h.buffer.WriteByte(ansiterm.ANSI_LINE_FEED)

	case ansiterm.ANSI_CARRIAGE_RETURN:
		if h.wrapNext {
			if err := h.Flush(); err != nil {
				return err
			}
			h.clearWrap()
		}
		pos, _, err := h.getCurrentInfo()
		if err != nil {
			return err
		}
		if pos.X != 0 {
			pos.X = 0
			h.updatePos(pos)
			h.buffer.WriteByte(ansiterm.ANSI_CARRIAGE_RETURN)
		}
		return nil

	default:
		return nil
	}
}