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Diffstat (limited to 'src/script/api/script_error.hpp')
| -rw-r--r-- | src/script/api/script_error.hpp | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/src/script/api/script_error.hpp b/src/script/api/script_error.hpp new file mode 100644 index 000000000..12fa83b97 --- /dev/null +++ b/src/script/api/script_error.hpp @@ -0,0 +1,179 @@ +/* $Id$ */ + +/* + * 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 script_error.hpp Everything to query errors. */ + +#ifndef SCRIPT_ERROR_HPP +#define SCRIPT_ERROR_HPP + +#include "script_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: + /** + * 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 /* SCRIPT_ERROR_HPP */ |