kb.h

Go to the documentation of this file.

 
/*
Copyright (c) 2026 MrXie1109
 
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
 
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
 
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/
 
#pragma once
#ifdef _WIN32
#include <windows.h>
#include <conio.h>
#else
#include <termios.h>
#include <unistd.h>
#include <poll.h>
#endif
 
namespace console
{
    enum class Key : int
    {
        None = 0,
 
        A = 'A',
        B,
        C,
        D,
        E,
        F,
        G,
        H,
        I,
        J,
        K,
        L,
        M,
        N,
        O,
        P,
        Q,
        R,
        S,
        T,
        U,
        V,
        W,
        X,
        Y,
        Z,
 
        Num0 = '0',
        Num1,
        Num2,
        Num3,
        Num4,
        Num5,
        Num6,
        Num7,
        Num8,
        Num9,
 
        Space = ' ',
 
        Enter = 13,
        Esc = 27,
        Backspace = 127,
        Tab = 9,
 
        Up = 1000,
        Down,
        Left,
        Right,
 
        F1,
        F2,
        F3,
        F4,
        F5,
        F6,
        F7,
        F8,
        F9,
        F10,
        F11,
        F12,
    };

    class Keyboard
    {
    public:
        Keyboard()
        {
#ifdef _WIN32
            hStdin = GetStdHandle(STD_INPUT_HANDLE);
            GetConsoleMode(hStdin, &oldMode);
            SetConsoleMode(hStdin, oldMode & ~(ENABLE_ECHO_INPUT | ENABLE_LINE_INPUT));
#else
            tcgetattr(STDIN_FILENO, &oldTio);
            struct termios newTio = oldTio;
            newTio.c_lflag &= ~(ICANON | ECHO);
            newTio.c_cc[VMIN] = 0;
            newTio.c_cc[VTIME] = 0;
            tcsetattr(STDIN_FILENO, TCSANOW, &newTio);
#endif
        }

        ~Keyboard()
        {
#ifdef _WIN32
            SetConsoleMode(hStdin, oldMode);
#else
            tcsetattr(STDIN_FILENO, TCSANOW, &oldTio);
#endif
        }

        Keyboard(const Keyboard &) = delete;

        Keyboard(Keyboard &&) = delete;

        Keyboard &operator=(const Keyboard &) = delete;

        Keyboard &operator=(Keyboard &&) = delete;

        Key get()
        {
            int raw = readRaw();
            if (raw == -1)
                return Key::None;
            return parse(raw);
        }

        Key wait()
        {
            while (true)
            {
                int raw = readRawBlock();
                if (raw != -1)
                    return parse(raw);
            }
        }
 
    private:
#ifdef _WIN32
        HANDLE hStdin; 
        DWORD oldMode; 
#else
        struct termios oldTio; 
#endif

        int readRaw()
        {
#ifdef _WIN32
            if (_kbhit())
                return _getch();
            return -1;
#else
            struct pollfd pfd = {STDIN_FILENO, POLLIN, 0};
            if (poll(&pfd, 1, 0) <= 0)
                return -1;
            unsigned char c;
            if (read(STDIN_FILENO, &c, 1) != 1)
                return -1;
            return c;
#endif
        }

        int readRawBlock()
        {
#ifdef _WIN32
            return _getch();
#else
            unsigned char c;
            struct pollfd pfd = {STDIN_FILENO, POLLIN, 0};
            while (true)
            {
                if (poll(&pfd, 1, -1) > 0)
                {
                    if (read(STDIN_FILENO, &c, 1) == 1)
                        return c;
                }
            }
#endif
        }

        Key parse(int raw)
        {
            if ((raw >= 'A' && raw <= 'Z') || (raw >= '0' && raw <= '9'))
            {
                return static_cast<Key>(raw);
            }
            if (raw >= 'a' && raw <= 'z')
            {
                return static_cast<Key>(raw - 32);
            }
            switch (raw)
            {
            case ' ':
                return Key::Space;
            case 13:
                return Key::Enter;
            case 27:
                return handleEscape();
            case 8:
            case 127:
                return Key::Backspace;
            case 9:
                return Key::Tab;
            }
#ifdef _WIN32
            if (raw == 0xE0 || raw == 0x00)
            {
                int ext = _getch();
                switch (ext)
                {
                case 0x48:
                    return Key::Up;
                case 0x50:
                    return Key::Down;
                case 0x4B:
                    return Key::Left;
                case 0x4D:
                    return Key::Right;
                case 0x3B:
                    return Key::F1;
                case 0x3C:
                    return Key::F2;
                case 0x3D:
                    return Key::F3;
                case 0x3E:
                    return Key::F4;
                case 0x3F:
                    return Key::F5;
                case 0x40:
                    return Key::F6;
                case 0x41:
                    return Key::F7;
                case 0x42:
                    return Key::F8;
                case 0x43:
                    return Key::F9;
                case 0x44:
                    return Key::F10;
                case 0x85:
                    return Key::F11;
                case 0x86:
                    return Key::F12;
                }
            }
#endif
            return Key::None;
        }

        Key handleEscape()
        {
#ifndef _WIN32
            struct pollfd pfd = {STDIN_FILENO, POLLIN, 0};
            if (poll(&pfd, 1, 5) <= 0)
                return Key::Esc;
            char seq[3];
            int n = read(STDIN_FILENO, seq, 3);
            if (n >= 2 && seq[0] == '[')
            {
                switch (seq[1])
                {
                case 'A':
                    return Key::Up;
                case 'B':
                    return Key::Down;
                case 'C':
                    return Key::Right;
                case 'D':
                    return Key::Left;
                }
            }
#endif
            return Key::Esc;
        }
    };
}