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/* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */
#ifndef I_GAME_COMMANDS_H
#define I_GAME_COMMANDS_H
#include "System/StringUtil.h"
#include "System/UnorderedMap.hpp"
#include <array>
#include <string>
template<class TActionExecutor>
class IGameCommands
{
protected:
IGameCommands() { actionExecutors.reserve(64); }
virtual ~IGameCommands() { RemoveAllActionExecutors(); }
public:
/**
* Registers the default action-executors for chat commands.
* These are all the ones that are not logically tied to a specific
* part/sub-module of the engine (for example rendering related switches).
* @see AddActionExecutor
*/
virtual void AddDefaultActionExecutors() = 0;
/**
* Registers a new action-executor for a chat command.
* @param executor has to be new'ed, will be delete'ed internally.
* @see RemoveActionExecutor
*/
void AddActionExecutor(TActionExecutor* executor) {
const std::string& commandLower = StringToLower(executor->GetCommand());
// prevent registering a duplicate action-executor for command
if (actionExecutors.find(commandLower) != actionExecutors.end())
return;
actionExecutors[commandLower] = executor;
}
/**
* Returns the action-executor for the given command (case-insensitive).
* @param command used to lookup the action-executor to be removed.
* @return the action-executor for the given command, or NULL, if none is
* registered.
*/
const TActionExecutor* GetActionExecutor(const std::string& command) const {
const auto aei = actionExecutors.find(StringToLower(command));
if (aei == actionExecutors.end())
return nullptr;
return aei->second;
}
const spring::unsynced_map<std::string, TActionExecutor*>& GetActionExecutors() const { return actionExecutors; }
const std::vector< std::pair<std::string, TActionExecutor*> >& GetSortedActionExecutors() {
using P = typename decltype(sortedExecutors)::value_type;
// no need for caching, very rarely called
sortedExecutors.clear();
sortedExecutors.reserve(actionExecutors.size());
for (const auto& pair: actionExecutors) {
sortedExecutors.emplace_back(pair);
}
std::sort(sortedExecutors.begin(), sortedExecutors.end(), [](const P& a, const P& b) { return (a.first < b.first); });
return sortedExecutors;
}
private:
/**
* Deregisters all currently registered action-executor for chat commands.
* @see RemoveActionExecutor
*/
void RemoveAllActionExecutors() {
for (const auto& pair: actionExecutors) {
pair.second->~TActionExecutor();
}
actionExecutors.clear();
sortedExecutors.clear();
}
protected:
template<typename T, typename... A> T* AllocActionExecutor(A&&... a) {
constexpr size_t size = sizeof(T);
if ((actionExecMemIndex + size) > actionExecutorMem.size()) {
assert(false);
return nullptr;
}
return new (&actionExecutorMem[(actionExecMemIndex += size) - size]) T(std::forward<A>(a)...);
}
protected:
// currently registered lower-case commands with their respective action-executors
spring::unsynced_map<std::string, TActionExecutor*> actionExecutors;
std::vector< std::pair<std::string, TActionExecutor*> > sortedExecutors;
std::array<uint8_t, 17400> actionExecutorMem;
size_t actionExecMemIndex = 0;
// size_t numActionExecutors = 0;
};
#endif // I_GAME_COMMANDS_H
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