quickerNES/source/inputParser.hpp

#pragma once

// Base controller class
// by eien86

#include <cstdint>
#include <jaffarCommon/exceptions.hpp>
#include <jaffarCommon/json.hpp>
#include <sstream>
#include <string>

namespace jaffar
{

typedef uint32_t port_t;

struct input_t
{
  bool power = false;
  bool reset = false;
  port_t port1 = 0;
  port_t port2 = 0;
  port_t arkanoidLatch = 0;
  uint8_t arkanoidFire = 0;
};

class InputParser
{
  public:
  enum controller_t
  {
    none,
    joypad,
    fourscore1,
    fourscore2,
    arkanoidNES,
    arkanoidFamicom
  };

  controller_t _controller1Type;
  controller_t _controller2Type;
  
  InputParser(const nlohmann::json &config)
  {
    // Parsing controller 1 type
    {
      bool isTypeRecognized = false;
      const auto controller1Type = jaffarCommon::json::getString(config, "Controller 1 Type");
      if (controller1Type == "None")
      {
        _controller1Type = controller_t::none;
        isTypeRecognized = true;
      }
      if (controller1Type == "Joypad")
      {
        _controller1Type = controller_t::joypad;
        isTypeRecognized = true;
      }
      if (controller1Type == "FourScore1")
      {
        _controller1Type = controller_t::fourscore1;
        isTypeRecognized = true;
      }
      if (controller1Type == "FourScore2")
      {
        _controller1Type = controller_t::fourscore2;
        isTypeRecognized = true;
      }
      if (controller1Type == "ArkanoidNES")
      {
        _controller1Type = controller_t::arkanoidNES;
        isTypeRecognized = true;
      }
      if (controller1Type == "ArkanoidFamicom")
      {
        _controller1Type = controller_t::arkanoidFamicom;
        isTypeRecognized = true;
      }
      if (isTypeRecognized == false) JAFFAR_THROW_LOGIC("Controller 1 type not recognized: '%s'\n", controller1Type.c_str());
    }

    // Parsing controller 2 type
    {
      bool isTypeRecognized = false;
      const auto controller2Type = jaffarCommon::json::getString(config, "Controller 2 Type");
      if (controller2Type == "None")
      {
        _controller2Type = controller_t::none;
        isTypeRecognized = true;
      }
      if (controller2Type == "Joypad")
      {
        _controller2Type = controller_t::joypad;
        isTypeRecognized = true;
      }
      if (controller2Type == "FourScore1")
      {
        _controller2Type = controller_t::fourscore1;
        isTypeRecognized = true;
      }
      if (controller2Type == "FourScore2")
      {
        _controller2Type = controller_t::fourscore2;
        isTypeRecognized = true;
      }
      if (isTypeRecognized == false) JAFFAR_THROW_LOGIC("Controller 2 type not recognized: '%s'\n", controller2Type.c_str());
    }
  }

  inline input_t parseInputString(const std::string &inputString) const
  {
    // Storage for the input
    input_t input;

    // Converting input into a stream for parsing
    std::istringstream ss(inputString);

    // Start separator
    if (ss.get() != '|') reportBadInputString(inputString);

    // Parsing console inputs
    parseConsoleInputs(input.reset, input.power, ss, inputString);

    // Parsing controller 1 inputs
    if (_controller1Type == arkanoidNES) parseArkanoidNESInput(input, ss, inputString);
    if (_controller1Type == arkanoidFamicom) parseArkanoidFamicomInput(input, ss, inputString);
    if (_controller1Type == joypad || _controller1Type == fourscore1) parseControllerInputs(_controller1Type, input.port1, ss, inputString);

    // Parsing controller 2 inputs
    if (_controller2Type == joypad || _controller2Type == fourscore2) parseControllerInputs(_controller2Type, input.port2, ss, inputString);

    // End separator
    if (ss.get() != '|') reportBadInputString(inputString);

    // If its not the end of the stream, then extra values remain and its invalid
    ss.get();
    if (ss.eof() == false) reportBadInputString(inputString);

    return input;
  }

  private:
  static inline void reportBadInputString(const std::string &inputString)
  {
    JAFFAR_THROW_LOGIC("Could not decode input string: '%s'\n", inputString.c_str());
  }

  static void parseJoyPadInput(uint8_t &code, std::istringstream &ss, const std::string &inputString)
  {
    // Currently read character
    char c;

    // Cleaning code
    code = 0;

    // Up
    c = ss.get();
    if (c != '.' && c != 'U') reportBadInputString(inputString);
    if (c == 'U') code |= 0b00010000;

    // Down
    c = ss.get();
    if (c != '.' && c != 'D') reportBadInputString(inputString);
    if (c == 'D') code |= 0b00100000;

    // Left
    c = ss.get();
    if (c != '.' && c != 'L') reportBadInputString(inputString);
    if (c == 'L') code |= 0b01000000;

    // Right
    c = ss.get();
    if (c != '.' && c != 'R') reportBadInputString(inputString);
    if (c == 'R') code |= 0b10000000;

    // Start
    c = ss.get();
    if (c != '.' && c != 'S') reportBadInputString(inputString);
    if (c == 'S') code |= 0b00001000;

    // Select
    c = ss.get();
    if (c != '.' && c != 's') reportBadInputString(inputString);
    if (c == 's') code |= 0b00000100;

    // B
    c = ss.get();
    if (c != '.' && c != 'B') reportBadInputString(inputString);
    if (c == 'B') code |= 0b00000010;

    // A
    c = ss.get();
    if (c != '.' && c != 'A') reportBadInputString(inputString);
    if (c == 'A') code |= 0b00000001;
  }

  static inline void parseArkanoidInput(input_t& input, std::istringstream& ss, const std::string& inputString)
  {
    uint8_t potentiometer = 0;
    uint8_t fire = 0;

    // Controller separator
    if (ss.get() != '|') reportBadInputString(inputString);

    if (ss.get() != ' ') reportBadInputString(inputString);
    if (ss.get() != ' ') reportBadInputString(inputString);

    char c = ss.get(); // Hundreds
    if (c != ' ' && c < 48 && c > 57) reportBadInputString(inputString);
    if (c != ' ') potentiometer += 100 * ( (uint8_t)c - 48 );

    c = ss.get(); // Tenths
    if (c != ' ' && c < 48 && c > 57) reportBadInputString(inputString);
    if (c != ' ') potentiometer += 10 * ( (uint8_t)c - 48 );

    c = ss.get(); // Units
    if (c != ' ' && c < 48 && c > 57) reportBadInputString(inputString);
    if (c != ' ') potentiometer += (uint8_t)c - 48;

    // Comma
    if (ss.get() != ',') reportBadInputString(inputString);

    // Fire
    
    c = ss.get();
    if (c != '.' && c != 'F') reportBadInputString(inputString);
    if (c == 'F') fire = 1;

    // Fire is encoded in port 1
    input.arkanoidFire = fire;

    // Potentiometer is encoded in port 2 - MSB and adding one bit for signalling the presence of the potentiometer, subtracted from 173
    uint8_t subtracter = 171 - potentiometer;
   
    input.arkanoidLatch = 0;
    if ((subtracter & 128) > 0) input.arkanoidLatch += 1;
    if ((subtracter & 64) > 0) input.arkanoidLatch += 2;
    if ((subtracter & 32) > 0) input.arkanoidLatch += 4;
    if ((subtracter & 16) > 0) input.arkanoidLatch += 8;
    if ((subtracter & 8) > 0) input.arkanoidLatch += 16;
    if ((subtracter & 4) > 0) input.arkanoidLatch += 32;
    if ((subtracter & 2) > 0) input.arkanoidLatch += 64;
    if ((subtracter & 1) > 0) input.arkanoidLatch += 128;
  }

  static void parseControllerInputs(const controller_t type, port_t &port, std::istringstream &ss, const std::string &inputString)
  {
    // If no controller assigned then, its port is all zeroes.
    if (type == controller_t::none)
    {
      port = 0;
      return;
    }

    // Controller separator
    if (ss.get() != '|') reportBadInputString(inputString);

    // If normal joypad, parse its code now
    if (type == controller_t::joypad)
    {
      // Storage for joypad's code
      uint8_t code = 0;

      // Parsing joypad code
      parseJoyPadInput(code, ss, inputString);

      // Pushing input code into the port
      port = code;

      // Adding joypad signature
      // Per https://www.nesdev.org/wiki/Standard_controller, the joypad reports 1s after the first 8 bits
      port |= ~0xFF;
    }

    // If its fourscore, its like two joypads separated by a |
    if (type == controller_t::fourscore1 || type == controller_t::fourscore2)
    {
      // Storage for joypad's code
      uint8_t code1 = 0;
      uint8_t code2 = 0;

      // Parsing joypad code1
      parseJoyPadInput(code1, ss, inputString);

      // Separator
      if (ss.get() != '|') reportBadInputString(inputString);

      // Parsing joypad code1
      parseJoyPadInput(code2, ss, inputString);

      // Creating code
      port = code1;
      port |= (uint32_t)0 | code2 << 8;
      if (type == controller_t::fourscore1) port |= (uint32_t)0 | 1 << 19;
      if (type == controller_t::fourscore2) port |= (uint32_t)0 | 1 << 18;
      port |= (uint32_t)0 | 1 << 24;
      port |= (uint32_t)0 | 1 << 25;
      port |= (uint32_t)0 | 1 << 26;
      port |= (uint32_t)0 | 1 << 27;
      port |= (uint32_t)0 | 1 << 28;
      port |= (uint32_t)0 | 1 << 29;
      port |= (uint32_t)0 | 1 << 30;
      port |= (uint32_t)0 | 1 << 31;
    }
  }

  static inline void parseArkanoidNESInput(input_t& input, std::istringstream& ss, const std::string& inputString)
  {
    // Simply parse the arkanoid controller input
    parseArkanoidInput(input, ss, inputString);
  }

  static inline void parseArkanoidFamicomInput(input_t& input, std::istringstream& ss, const std::string& inputString)
  {
    // Parsing joypad controller
    parseControllerInputs(controller_t::joypad, input.port1, ss, inputString);

    // Controller separator
    if (ss.get() != '|') reportBadInputString(inputString);

    // Advancing 7 positions (this input is not supported)
    for (size_t i = 0; i < 7; i++) if (ss.get() != '.') reportBadInputString(inputString);

    // Then, parse the arkanoid controller input
    parseArkanoidInput(input, ss, inputString);
  }


  static void parseConsoleInputs(bool &reset, bool &power, std::istringstream &ss, const std::string &inputString)
  {
    // Currently read character
    char c;

    // Power trigger
    c = ss.get();
    if (c != '.' && c != 'P') reportBadInputString(inputString);
    if (c == 'P') power = true;
    if (c == '.') power = false;

    // Reset trigger
    c = ss.get();
    if (c != '.' && c != 'r') reportBadInputString(inputString);
    if (c == 'r') reset = true;
    if (c == '.') reset = false;
  }

}; // class InputParser

} // namespace jaffar