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/* $Id$ */
/*
* This file is part of OpenTTD.
* 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.
* 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.
* 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/>.
*/
/** @file ai_error.hpp Everything to query errors. */
#ifndef AI_ERROR_HPP
#define AI_ERROR_HPP
#include "ai_object.hpp"
#include <map>
/**
* Helper to write precondition enforcers for the AI API in an abbreviated manner.
* @param returnval The value to return on failure.
* @param condition The condition that must be obeyed.
*/
#define EnforcePrecondition(returnval, condition) \
if (!(condition)) { \
AIObject::SetLastError(AIError::ERR_PRECONDITION_FAILED); \
return returnval; \
}
/**
* Helper to write precondition enforcers for the AI API in an abbreviated manner.
* @param returnval The value to return on failure.
* @param condition The condition that must be obeyed.
* @param error_code The error code passed to AIObject::SetLastError.
*/
#define EnforcePreconditionCustomError(returnval, condition, error_code) \
if (!(condition)) { \
AIObject::SetLastError(error_code); \
return returnval; \
}
/**
* Class that handles all error related functions.
*/
class AIError : public AIObject {
public:
/** Get the name of this class to identify it towards squirrel. */
static const char *GetClassName() { return "AIError"; }
/**
* All categories errors can be divided in.
*/
enum ErrorCategories {
ERR_CAT_NONE = 0, ///< Error messages not related to any category.
ERR_CAT_GENERAL, ///< Error messages related to general things.
ERR_CAT_VEHICLE, ///< Error messages related to building / maintaining vehicles.
ERR_CAT_STATION, ///< Error messages related to building / maintaining stations.
ERR_CAT_BRIDGE, ///< Error messages related to building / removing bridges.
ERR_CAT_TUNNEL, ///< Error messages related to building / removing tunnels.
ERR_CAT_TILE, ///< Error messages related to raising / lowering and demolishing tiles.
ERR_CAT_SIGN, ///< Error messages related to building / removing signs.
ERR_CAT_RAIL, ///< Error messages related to building / maintaining rails.
ERR_CAT_ROAD, ///< Error messages related to building / maintaining roads.
ERR_CAT_ORDER, ///< Error messages related to managing orders.
ERR_CAT_MARINE, ///< Error messages related to building / removing ships, docks and channels.
ERR_CAT_WAYPOINT, ///< Error messages related to building / maintaining waypoints.
/**
* DO NOT USE! The error bitsize determines how many errors can be stored in
* a category and what the offsets are of all categories.
*/
ERR_CAT_BIT_SIZE = 8,
};
/**
* All general related error messages.
*/
enum ErrorMessages {
/** Initial error value */
ERR_NONE = ERR_CAT_NONE << ERR_CAT_BIT_SIZE, // []
/** If an error occurred and the error wasn't mapped */
ERR_UNKNOWN, // []
/** If a precondition is not met */
ERR_PRECONDITION_FAILED, // []
/** A string supplied was too long */
ERR_PRECONDITION_STRING_TOO_LONG, // []
/** An error returned by a NewGRF. No possibility to get the exact error in an AI readable format */
ERR_NEWGRF_SUPPLIED_ERROR, // []
/** Base for general errors */
ERR_GENERAL_BASE = ERR_CAT_GENERAL << ERR_CAT_BIT_SIZE,
/** Not enough cash to perform the previous action */
ERR_NOT_ENOUGH_CASH, // [STR_ERROR_NOT_ENOUGH_CASH_REQUIRES_CURRENCY]
/** Local authority won't allow the previous action */
ERR_LOCAL_AUTHORITY_REFUSES, // [STR_ERROR_LOCAL_AUTHORITY_REFUSES_TO_ALLOW_THIS]
/** The piece of infrastructure you tried to build is already in place */
ERR_ALREADY_BUILT, // [STR_ERROR_ALREADY_BUILT, STR_ERROR_MUST_DEMOLISH_BRIDGE_FIRST]
/** Area isn't clear, try to demolish the building on it */
ERR_AREA_NOT_CLEAR, // [STR_ERROR_BUILDING_MUST_BE_DEMOLISHED, STR_ERROR_MUST_DEMOLISH_BRIDGE_FIRST, STR_ERROR_MUST_DEMOLISH_RAILROAD, STR_ERROR_MUST_DEMOLISH_AIRPORT_FIRST, STR_ERROR_MUST_DEMOLISH_CARGO_TRAM_STATION_FIRST, STR_ERROR_MUST_DEMOLISH_TRUCK_STATION_FIRST, STR_ERROR_MUST_DEMOLISH_PASSENGER_TRAM_STATION_FIRST, STR_ERROR_MUST_DEMOLISH_BUS_STATION_FIRST, STR_ERROR_BUOY_IN_THE_WAY, STR_ERROR_MUST_DEMOLISH_DOCK_FIRST, STR_ERROR_GENERIC_OBJECT_IN_THE_WAY, STR_ERROR_COMPANY_HEADQUARTERS_IN, STR_ERROR_OBJECT_IN_THE_WAY, STR_ERROR_MUST_REMOVE_ROAD_FIRST, STR_ERROR_MUST_REMOVE_RAILROAD_TRACK, STR_ERROR_MUST_DEMOLISH_BRIDGE_FIRST, STR_ERROR_MUST_DEMOLISH_TUNNEL_FIRST, STR_ERROR_EXCAVATION_WOULD_DAMAGE]
/** Area / property is owned by another company */
ERR_OWNED_BY_ANOTHER_COMPANY, // [STR_ERROR_AREA_IS_OWNED_BY_ANOTHER, STR_ERROR_OWNED_BY]
/** The name given is not unique for the object type */
ERR_NAME_IS_NOT_UNIQUE, // [STR_ERROR_NAME_MUST_BE_UNIQUE]
/** The building you want to build requires flat land */
ERR_FLAT_LAND_REQUIRED, // [STR_ERROR_FLAT_LAND_REQUIRED]
/** Land is sloped in the wrong direction for this build action */
ERR_LAND_SLOPED_WRONG, // [STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION]
/** A vehicle is in the way */
ERR_VEHICLE_IN_THE_WAY, // [STR_ERROR_TRAIN_IN_THE_WAY, STR_ERROR_ROAD_VEHICLE_IN_THE_WAY, STR_ERROR_SHIP_IN_THE_WAY, STR_ERROR_AIRCRAFT_IN_THE_WAY]
/** Site is unsuitable */
ERR_SITE_UNSUITABLE, // [STR_ERROR_SITE_UNSUITABLE]
/** Too close to the edge of the map */
ERR_TOO_CLOSE_TO_EDGE, // [STR_ERROR_TOO_CLOSE_TO_EDGE_OF_MAP]
/** Station is too spread out */
ERR_STATION_TOO_SPREAD_OUT, // [STR_ERROR_STATION_TOO_SPREAD_OUT]
};
/**
* Check the membership of the last thrown error.
* @return The category the error belongs to.
* @note The last throw error can be aquired by calling GetLastError().
*/
static ErrorCategories GetErrorCategory();
/**
* Get the last error.
* @return An ErrorMessages enum value.
*/
static AIErrorType GetLastError();
/**
* Get the last error in string format (for human readability).
* @return An ErrorMessage enum item, as string.
*/
static char *GetLastErrorString();
#ifndef EXPORT_SKIP
/**
* Get the error based on the OpenTTD StringID.
* @note DO NOT INVOKE THIS METHOD YOURSELF!
* @param internal_string_id The string to convert.
* @return The NoAI equivalent error message.
*/
static AIErrorType StringToError(StringID internal_string_id);
/**
* Map an internal OpenTTD error message to its NoAI equivalent.
* @note DO NOT INVOKE THIS METHOD YOURSELF! The calls are autogenerated.
* @param internal_string_id The OpenTTD StringID used for an error.
* @param ai_error_msg The NoAI equivalent error message.
*/
static void RegisterErrorMap(StringID internal_string_id, AIErrorType ai_error_msg);
/**
* Map an internal OpenTTD error message to its NoAI equivalent.
* @note DO NOT INVOKE THIS METHOD YOURSELF! The calls are autogenerated.
* @param ai_error_msg The NoAI error message representation.
* @param message The string representation of this error message, used for debug purposes.
*/
static void RegisterErrorMapString(AIErrorType ai_error_msg, const char *message);
#endif /* EXPORT_SKIP */
private:
typedef std::map<StringID, AIErrorType> AIErrorMap; ///< The type for mapping between error (internal OpenTTD) StringID to the AI error type.
typedef std::map<AIErrorType, const char *> AIErrorMapString; ///< The type for mapping between error type and textual representation.
static AIErrorMap error_map; ///< The mapping between error (internal OpenTTD) StringID to the AI error type.
static AIErrorMapString error_map_string; ///< The mapping between error type and textual representation.
};
#endif /* AI_ERROR_HPP */
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