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/* $Id$ */
/** @file ai_info_dummy.cpp Implementation of a dummy AI. */
#include <squirrel.h>
#include "../stdafx.h"
#include "../string_func.h"
#include "../strings_func.h"
#include "table/strings.h"
/* The reason this exists in C++, is that a user can trash his ai/ dir,
* leaving no AIs available. The complexity to solve this is insane, and
* therefor the alternative is used, and make sure there is always an AI
* available, no matter what the situation is. By defining it in C++, there
* is simply now way a user can delete it, and therefor safe to use. It has
* to be noted that this AI is complete invisible for the user, and impossible
* to select manual. It is a fail-over in case no AIs are available.
*/
const SQChar _dummy_script_info[] = _SC(" \n\
class DummyAI extends AIInfo { \n\
function GetAuthor() { return \"OpenTTD NoAI Developers Team\"; } \n\
function GetName() { return \"DummyAI\"; } \n\
function GetShortName() { return \"DUMM\"; } \n\
function GetDescription() { return \"A Dummy AI that is loaded when your ai/ dir is empty\"; }\n\
function GetVersion() { return 1; } \n\
function GetDate() { return \"2008-07-26\"; } \n\
function CreateInstance() { return \"DummyAI\"; } \n\
} \n\
\n\
RegisterDummyAI(DummyAI()); \n\
");
void AI_CreateAIInfoDummy(HSQUIRRELVM vm)
{
sq_pushroottable(vm);
/* Load and run the script */
if (SQ_SUCCEEDED(sq_compilebuffer(vm, _dummy_script_info, scstrlen(_dummy_script_info), _SC("dummy"), SQTrue))) {
sq_push(vm, -2);
if (SQ_SUCCEEDED(sq_call(vm, 1, SQFalse, SQTrue))) {
sq_pop(vm, 1);
return;
}
}
NOT_REACHED();
}
void AI_CreateAIDummy(HSQUIRRELVM vm)
{
/* We want to translate the error message.
* We do this in three steps:
* 1) We get the error message
*/
char error_message[1024];
GetString(error_message, STR_ERROR_AI_NO_AI_FOUND, lastof(error_message));
/* 2) We construct the AI's code. This is done by merging a header, body and footer */
char dummy_script[4096];
char *dp = dummy_script;
dp = strecpy(dp, "class DummyAI extends AIController {\n function Start() {\n", lastof(dummy_script));
/* As special trick we need to split the error message on newlines and
* emit each newline as a separate error printing string. */
char *newline;
char *p = error_message;
do {
newline = strchr(p, '\n');
if (newline != NULL) *newline = '\0';
dp += seprintf(dp, lastof(dummy_script), " AILog.Error(\"%s\");\n", p);
p = newline + 1;
} while (newline != NULL);
dp = strecpy(dp, " }\n}\n", lastof(dummy_script));
/* 3) We translate the error message in the character format that Squirrel wants.
* We can use the fact that the wchar string printing also uses %s to print
* old style char strings, which is what was generated during the script generation. */
const SQChar *sq_dummy_script = OTTD2FS(dummy_script);
/* And finally we load and run the script */
sq_pushroottable(vm);
if (SQ_SUCCEEDED(sq_compilebuffer(vm, sq_dummy_script, scstrlen(sq_dummy_script), _SC("dummy"), SQTrue))) {
sq_push(vm, -2);
if (SQ_SUCCEEDED(sq_call(vm, 1, SQFalse, SQTrue))) {
sq_pop(vm, 1);
return;
}
}
NOT_REACHED();
}
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