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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program 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; either version 2
* of the License, or (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#ifndef GLK_ALAN3_ALT_INFO
#define GLK_ALAN3_ALT_INFO
/* An info node about the Verb Alternatives found and possibly executed */
#include "glk/alan3/types.h"
#include "glk/alan3/acode.h"
#include "glk/alan3/jumps.h"
#include "glk/alan3/params.h"
#include "glk/alan3/parameter_position.h"
namespace Glk {
namespace Alan3 {
/* Constants */
#define GLOBAL_LEVEL (0)
#define LOCATION_LEVEL (1)
#define PARAMETER_LEVEL (2)
#define NO_PARAMETER ((Aword)-1)
#define NO_INSTANCE ((Aword)-1)
#define NO_CLASS ((Aword)-1)
/* tryCheck() flags */
#define EXECUTE_CHECK_BODY_ON_FAIL TRUE
#define DONT_EXECUTE_CHECK_BODY_ON_FAIL FALSE
/* Types */
struct AltInfo {
bool end; /* Indicator of end in AltInfoArray, first empty has TRUE here */
AltEntry *alt;
bool done;
Aint level; /* 0 - Global, 1 - location, 2 - parameter */
Aid _class; /* In which class, only used for tracing */
Aid instance; /* In which instance the Alternative was found,
used to set current.instance and tracing */
Aid parameter; /* In which parameter, only used for tracing */
};
typedef AltEntry *(*AltEntryFinder)(int verb, int parameterNumber, int theInstance, int theClass);
typedef AltInfo AltInfoArray[];
/* Data */
/* Functions */
extern void primeAltInfo(AltInfo *altInfo, int level, int parameter, int instance, int cls);
extern bool executedOk(CONTEXT, AltInfo *altInfo);
extern bool checkFailed(CONTEXT, AltInfo *altInfo, bool execute);
extern bool canBeExecuted(AltInfo *altInfo);
extern AltInfo *duplicateAltInfoArray(AltInfoArray altInfos);
extern int lastAltInfoIndex(AltInfoArray altInfos);
extern bool anyCheckFailed(CONTEXT, AltInfoArray altInfos, bool execute);
extern bool anythingToExecute(AltInfoArray altInfos);
extern bool possible(CONTEXT, int verb, Parameter parameters[], ParameterPosition parameterPositions[]);
extern AltInfo *findAllAlternatives(int verb, Parameter parameters[]);
} // End of namespace Alan3
} // End of namespace Glk
#endif
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