dolphin/Source/Core/InputCommon/ControllerInterface/ExpressionParser.h

// Copyright 2013 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.

#pragma once

#include <memory>
#include <string>
#include "InputCommon/ControllerInterface/Device.h"

namespace ciface
{
namespace ExpressionParser
{
class ControlQualifier
{
public:
  bool has_device;
  Core::DeviceQualifier device_qualifier;
  std::string control_name;

  ControlQualifier() : has_device(false) {}
  operator std::string()
  {
    if (has_device)
      return device_qualifier.ToString() + ":" + control_name;
    else
      return control_name;
  }
};

class ControlFinder
{
public:
  ControlFinder(const Core::DeviceContainer& container_, const Core::DeviceQualifier& default_,
                const bool is_input_)
      : container(container_), default_device(default_), is_input(is_input_)
  {
  }
  std::shared_ptr<Core::Device> FindDevice(ControlQualifier qualifier);
  Core::Device::Control* FindControl(ControlQualifier qualifier);

private:
  const Core::DeviceContainer& container;
  const Core::DeviceQualifier& default_device;
  bool is_input;
};

class ExpressionNode;
class Expression
{
public:
  Expression() : node(nullptr) {}
  Expression(ExpressionNode* node);
  ~Expression();
  ControlState GetValue();
  void SetValue(ControlState state);
  int num_controls;
  ExpressionNode* node;
};

enum ExpressionParseStatus
{
  EXPRESSION_PARSE_SUCCESS = 0,
  EXPRESSION_PARSE_SYNTAX_ERROR,
  EXPRESSION_PARSE_NO_DEVICE,
};

ExpressionParseStatus ParseExpression(const std::string& expr, ControlFinder& finder,
                                      Expression** expr_out);
}
}