113 lines
4.7 KiB
C++
113 lines
4.7 KiB
C++
/* $Id$ */
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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 ai_info_dummy.cpp Implementation of a dummy AI. */
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#include <squirrel.h>
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#include "../stdafx.h"
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#include "../string_func.h"
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#include "../strings_func.h"
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#include "table/strings.h"
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/* The reason this exists in C++, is that a user can trash his ai/ dir,
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* leaving no AIs available. The complexity to solve this is insane, and
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* therefor the alternative is used, and make sure there is always an AI
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* available, no matter what the situation is. By defining it in C++, there
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* is simply now way a user can delete it, and therefor safe to use. It has
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* to be noted that this AI is complete invisible for the user, and impossible
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* to select manual. It is a fail-over in case no AIs are available.
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*/
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/** info.nut for the dummy AI. */
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const SQChar _dummy_script_info[] = _SC(" \n\
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class DummyAI extends AIInfo { \n\
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function GetAuthor() { return \"OpenTTD NoAI Developers Team\"; } \n\
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function GetName() { return \"DummyAI\"; } \n\
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function GetShortName() { return \"DUMM\"; } \n\
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function GetDescription() { return \"A Dummy AI that is loaded when your ai/ dir is empty\"; }\n\
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function GetVersion() { return 1; } \n\
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function GetDate() { return \"2008-07-26\"; } \n\
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function CreateInstance() { return \"DummyAI\"; } \n\
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} \n\
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\n\
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RegisterDummyAI(DummyAI()); \n\
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");
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/** Run the dummy info.nut. */
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void AI_CreateAIInfoDummy(HSQUIRRELVM vm)
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{
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sq_pushroottable(vm);
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/* Load and run the script */
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if (SQ_SUCCEEDED(sq_compilebuffer(vm, _dummy_script_info, scstrlen(_dummy_script_info), _SC("dummy"), SQTrue))) {
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sq_push(vm, -2);
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if (SQ_SUCCEEDED(sq_call(vm, 1, SQFalse, SQTrue))) {
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sq_pop(vm, 1);
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return;
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}
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}
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NOT_REACHED();
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}
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/** Run the dummy AI and let it generate an error message. */
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void AI_CreateAIDummy(HSQUIRRELVM vm)
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{
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/* We want to translate the error message.
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* We do this in three steps:
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* 1) We get the error message
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*/
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char error_message[1024];
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GetString(error_message, STR_ERROR_AI_NO_AI_FOUND, lastof(error_message));
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/* Make escapes for all quotes and slashes. */
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char safe_error_message[1024];
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char *q = safe_error_message;
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for (const char *p = error_message; *p != '\0' && q < lastof(safe_error_message) - 2; p++, q++) {
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if (*p == '"' || *p == '\\') *q++ = '\\';
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*q = *p;
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}
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*q = '\0';
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/* 2) We construct the AI's code. This is done by merging a header, body and footer */
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char dummy_script[4096];
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char *dp = dummy_script;
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dp = strecpy(dp, "class DummyAI extends AIController {\n function Start()\n {\n", lastof(dummy_script));
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/* As special trick we need to split the error message on newlines and
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* emit each newline as a separate error printing string. */
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char *newline;
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char *p = safe_error_message;
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do {
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newline = strchr(p, '\n');
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if (newline != NULL) *newline = '\0';
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dp += seprintf(dp, lastof(dummy_script), " AILog.Error(\"%s\");\n", p);
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p = newline + 1;
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} while (newline != NULL);
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dp = strecpy(dp, " }\n}\n", lastof(dummy_script));
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/* 3) We translate the error message in the character format that Squirrel wants.
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* We can use the fact that the wchar string printing also uses %s to print
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* old style char strings, which is what was generated during the script generation. */
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const SQChar *sq_dummy_script = OTTD2SQ(dummy_script);
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/* And finally we load and run the script */
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sq_pushroottable(vm);
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if (SQ_SUCCEEDED(sq_compilebuffer(vm, sq_dummy_script, scstrlen(sq_dummy_script), _SC("dummy"), SQTrue))) {
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sq_push(vm, -2);
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if (SQ_SUCCEEDED(sq_call(vm, 1, SQFalse, SQTrue))) {
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sq_pop(vm, 1);
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return;
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}
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}
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NOT_REACHED();
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}
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