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/*
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* This file is part of OpenTTD.
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* OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
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* OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file command_func.h Functions related to commands. */
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#ifndef COMMAND_FUNC_H
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#define COMMAND_FUNC_H
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#include "command_type.h"
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#include "company_type.h"
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#include <vector>
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#include "tile_map.h"
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/**
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* Define a default return value for a failed command.
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*
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* This variable contains a CommandCost object with is declared as "failed".
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* Other functions just need to return this error if there is an error,
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* which doesn't need to specific by a StringID.
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*/
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static const CommandCost CMD_ERROR = CommandCost(INVALID_STRING_ID);
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/**
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* Returns from a function with a specific StringID as error.
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*
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* This macro is used to return from a function. The parameter contains the
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* StringID which will be returned.
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*
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* @param errcode The StringID to return
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*/
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#define return_cmd_error(errcode) return CommandCost(errcode);
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/** Storage buffer for serialized command data. */
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typedef std::vector<byte> CommandDataBuffer;
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bool DoCommandP(Commands cmd, StringID err_message, CommandCallback *callback, TileIndex tile, uint32 p1, uint32 p2, const std::string &text = {});
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bool DoCommandP(Commands cmd, StringID err_message, TileIndex tile, uint32 p1, uint32 p2, const std::string &text = {});
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bool DoCommandP(Commands cmd, CommandCallback *callback, TileIndex tile, uint32 p1, uint32 p2, const std::string &text = {});
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bool DoCommandP(Commands cmd, TileIndex tile, uint32 p1, uint32 p2, const std::string &text = {});
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bool InjectNetworkCommand(Commands cmd, StringID err_message, CommandCallback *callback, bool my_cmd, TileIndex tile, uint32 p1, uint32 p2, const std::string &text);
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CommandCost DoCommandPInternal(Commands cmd, StringID err_message, CommandCallback *callback, bool my_cmd, bool estimate_only, bool network_command, TileIndex tile, uint32 p1, uint32 p2, const std::string &text);
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void NetworkSendCommand(Commands cmd, StringID err_message, CommandCallback *callback, CompanyID company, TileIndex tile, uint32 p1, uint32 p2, const std::string &text);
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void NetworkSendCommand(Commands cmd, StringID err_message, CommandCallback *callback, CompanyID company, TileIndex location, const CommandDataBuffer &cmd_data);
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extern Money _additional_cash_required;
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bool IsValidCommand(Commands cmd);
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CommandFlags GetCommandFlags(Commands cmd);
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const char *GetCommandName(Commands cmd);
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Money GetAvailableMoneyForCommand();
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bool IsCommandAllowedWhilePaused(Commands cmd);
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template <Commands Tcmd>
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constexpr CommandFlags GetCommandFlags()
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{
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return CommandTraits<Tcmd>::flags;
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}
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/**
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* Extracts the DC flags needed for DoCommand from the flags returned by GetCommandFlags
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* @param cmd_flags Flags from GetCommandFlags
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* @return flags for DoCommand
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*/
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static constexpr inline DoCommandFlag CommandFlagsToDCFlags(CommandFlags cmd_flags)
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{
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DoCommandFlag flags = DC_NONE;
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if (cmd_flags & CMD_NO_WATER) flags |= DC_NO_WATER;
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if (cmd_flags & CMD_AUTO) flags |= DC_AUTO;
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if (cmd_flags & CMD_ALL_TILES) flags |= DC_ALL_TILES;
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return flags;
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}
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/** Helper class to keep track of command nesting level. */
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struct RecursiveCommandCounter {
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RecursiveCommandCounter() noexcept { _counter++; }
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~RecursiveCommandCounter() noexcept { _counter--; }
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/** Are we in the top-level command execution? */
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bool IsTopLevel() const { return _counter == 1; }
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private:
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static int _counter;
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};
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template<Commands TCmd, typename T> struct CommandHelper;
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class CommandHelperBase {
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protected:
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static void InternalDoBefore(bool top_level, bool test);
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static void InternalDoAfter(CommandCost &res, DoCommandFlag flags, bool top_level, bool test);
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};
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/**
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* Templated wrapper that exposes the command parameter arguments
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* for the various Command::Do/Post calls.
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* @tparam Tcmd The command-id to execute.
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* @tparam Targs The command parameter types.
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*/
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template <Commands Tcmd, typename... Targs>
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struct CommandHelper<Tcmd, CommandCost(*)(DoCommandFlag, Targs...)> : protected CommandHelperBase {
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public:
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/**
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* This function executes a given command with the parameters from the #CommandProc parameter list.
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* Depending on the flags parameter it executes or tests a command.
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*
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* @note This function is to be called from the StateGameLoop or from within the execution of a Command.
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* This function must not be called from the context of a "player" (real person, AI, game script).
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* Use ::Post for commands directly triggered by "players".
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*
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* @param flags Flags for the command and how to execute the command
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* @param args Parameters for the command
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* @see CommandProc
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* @return the cost
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*/
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static CommandCost Do(DoCommandFlag flags, Targs... args)
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{
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if constexpr (std::is_same_v<TileIndex, std::tuple_element_t<0, std::tuple<Targs...>>>) {
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/* Do not even think about executing out-of-bounds tile-commands. */
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TileIndex tile = std::get<0>(std::make_tuple(args...));
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if (tile != 0 && (tile >= MapSize() || (!IsValidTile(tile) && (flags & DC_ALL_TILES) == 0))) return CMD_ERROR;
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}
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RecursiveCommandCounter counter{};
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/* Only execute the test call if it's toplevel, or we're not execing. */
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if (counter.IsTopLevel() || !(flags & DC_EXEC)) {
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InternalDoBefore(counter.IsTopLevel(), true);
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CommandCost res = CommandTraits<Tcmd>::proc(flags & ~DC_EXEC, args...);
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InternalDoAfter(res, flags, counter.IsTopLevel(), true); // Can modify res.
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if (res.Failed() || !(flags & DC_EXEC)) return res;
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}
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/* Execute the command here. All cost-relevant functions set the expenses type
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* themselves to the cost object at some point. */
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InternalDoBefore(counter.IsTopLevel(), false);
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CommandCost res = CommandTraits<Tcmd>::proc(flags, args...);
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InternalDoAfter(res, flags, counter.IsTopLevel(), false);
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return res;
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}
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};
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template <Commands Tcmd>
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using Command = CommandHelper<Tcmd, typename CommandTraits<Tcmd>::ProcType>;
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#endif /* COMMAND_FUNC_H */
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