[Mammoth] Add a keyboard library that translates scancode to keycodes.

lib/mammoth/input/keyboard.h

@@ -0,0 +1,88 @@
+#pragma once
+
+#include "mammoth/ipc/port_server.h"
+#include "mammoth/proc/thread.h"
+
+namespace mmth {
+
+enum Keycode {
+  kUnknownKeycode = 0x0,
+
+  kA = 0x1,
+  kB = 0x2,
+  kC = 0x3,
+  kD = 0x4,
+  kE = 0x5,
+  kF = 0x6,
+  kG = 0x7,
+  kH = 0x8,
+  kI = 0x9,
+  kJ = 0xA,
+  kK = 0xB,
+  kL = 0xC,
+  kM = 0xD,
+  kN = 0xE,
+  kO = 0xF,
+  kP = 0x10,
+  kQ = 0x11,
+  kR = 0x12,
+  kS = 0x13,
+  kT = 0x14,
+  kU = 0x15,
+  kV = 0x16,
+  kW = 0x17,
+  kX = 0x18,
+  kY = 0x19,
+  kZ = 0x1A,
+
+  k1 = 0x20,
+  k2 = 0x21,
+  k3 = 0x22,
+  k4 = 0x23,
+  k5 = 0x24,
+  k6 = 0x25,
+  k7 = 0x26,
+  k8 = 0x27,
+  k9 = 0x28,
+  k0 = 0x29,
+
+  kSpace = 0x30,
+  kEnter = 0x31,
+};
+
+enum Action {
+  kUnknownAction,
+  kPressed,
+  kReleased,
+};
+
+class KeyboardListenerBase {
+ public:
+  KeyboardListenerBase();
+  KeyboardListenerBase(const KeyboardListenerBase&) = delete;
+  KeyboardListenerBase(KeyboardListenerBase&&) = delete;
+
+  void Register();
+
+  Thread Listen();
+
+  void ListenLoop();
+
+  // Override this to recieve all raw keycodes. By default
+  // this function will try to translate each keycode into
+  // a printable character and call HandleCharacter.
+  virtual void HandleKeycode(Keycode code, Action action);
+
+  // This function is called by the default HandleKeycode
+  // implementation if you do not override it. If it recieves
+  // input that corresponds to a printable character it will
+  virtual void HandleCharacter(char c){};
+
+ private:
+  PortServer server_;
+
+  Keycode ScancodeToKeycode(uint8_t scancode);
+  Action ScancodeToAction(uint8_t scancode);
+};
+
+}  // namespace mmth