con_terminal.hpp

#if !defined(__CON_TERMINAL_HPP__)
#define __CON_TERMINAL_HPP__

//
// local includes
//
#include "core/drivers/serial/con_console.hpp"

struct con_terminal : public con_console
{
    //
    // types
    //
    typedef uint16_t cursor_t;
    static_assert(is_unsigned<cursor_t>::conforms, "cursor_t must be an unsigned integer");

  protected:
    //
    // window properties
    //
    struct window_state
    {
        rect_t   screen;
        rect_t   window;
        cursor_t cursor_x, cursor_y;
        color_t  fgcolor, bgcolor;

        inline int goto_xy(const cursor_t x=0, const cursor_t y=0)
        {
            if ((x >= window.w) || (y >= window.h)) return -L4_EINVAL;
            cursor_x=x, cursor_y=y;
            return 0;
        }

        inline void cr(void)
        {
            cursor_x=0;
        }

        inline bool nl(const bool cr_mode=true)
        {
            if (cr_mode) cursor_x=0;
            if (cursor_y >= window.h-1) return true;
            cursor_y++;
            return false;
        }
    } default_state, state;

    //
    // VT52 / VT100 terminal attributes
    //
    struct vt100_attributes
    {
        // dim & blink are currently unused
        unsigned bright     : 1, dim        : 1,
                 underscore : 1, blink      : 1,
                 reverse    : 1, hidden     : 1;
        signed   fgcolor_ix : 4, bgcolor_ix : 4;

        inline vt100_attributes(void)
            : bright(0), dim(0), underscore(0), blink(0), reverse(0), hidden(0),
              fgcolor_ix(-1), bgcolor_ix(-1)
        {}
    } attributes;

  public:
    //
    // constructor, destructor & reset
    //
    con_terminal(color_t fgcolor=DEFAULT_FGCOLOR, color_t bgcolor=DEFAULT_BGCOLOR,
                 const rect_t &margins=((rect_t){x: 0, y: 0, w: 0, h: 0}));

    inline ~con_terminal(void)
    {}

    inline int reset(void)
    {
        if (!is_open()) return -L4_EINVAL;
        screen=(state=default_state).screen;
        return clear_screen();
    }

    //
    // text functions (use character coordinates)
    //
    inline int scroll_screen(const int delta=-1) const
    {
        return vscroll(default_state.bgcolor, delta * font_height);
    }

    inline int clear_screen(const cursor_t x=0, const cursor_t y=0,
                            const cursor_t w=0, const cursor_t h=0) const
    {
        return fill(default_state.bgcolor, x * font_width, y * font_height,
                    w * font_width, h * font_height);
    }

    inline int goto_xy(const cursor_t x=0, const cursor_t y=0)
    {
        return state.goto_xy(x, y);
    }

    int print(const char *text);

  protected:
    int do_print_xy(cursor_t x, cursor_t y, const char *text, int length) const;
    int evaluate_escape_sequence(const uint8_t *&esc);
    int apply_attributes(const vt100_attributes &attrs=vt100_attributes());
};

#endif

// ***** end of source ***** //