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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.
*
* $URL$
* $Id$
*
*/
#ifndef DRACI_SCRIPT_H
#define DRACI_SCRIPT_H
#include "common/str.h"
#include "common/stream.h"
#include "common/queue.h"
namespace Draci {
/** The maximum number of parameters for a GPL command */
const int kMaxParams = 3;
class DraciEngine;
class Script;
enum {
kNumCommands = 55
};
typedef void (Script::* GPLHandler)(Common::Queue<int> &);
typedef int (Script::* GPLOperatorHandler)(int, int);
typedef int (Script::* GPLFunctionHandler)(int);
/**
* Represents a single command in the GPL scripting language bytecode.
* Each command is represented in the bytecode by a command number and a
* subnumber.
*/
struct GPL2Command {
byte _number;
byte _subNumber;
Common::String _name;
uint16 _numParams;
int _paramTypes[kMaxParams];
GPLHandler _handler;
};
struct GPL2Operator {
Common::String _name;
GPLOperatorHandler _handler;
};
struct GPL2Function {
Common::String _name;
GPLFunctionHandler _handler;
};
/**
* A convenience data type that holds both the actual bytecode and the
* length of the bytecode. Passed to Script::run().
*/
struct GPL2Program {
GPL2Program() : _bytecode(NULL), _length(0) {}
byte *_bytecode;
uint16 _length;
};
class Script {
public:
Script(DraciEngine *vm) : _vm(vm) { setupCommandList(); };
int run(GPL2Program program, uint16 offset);
private:
/** List of all GPL commands. Initialised in the constructor. */
const GPL2Command *_commandList;
const GPL2Operator *_operatorList;
const GPL2Function *_functionList;
void load(Common::Queue<int> ¶ms);
void start(Common::Queue<int> ¶ms);
int operAnd(int op1, int op2);
int operOr(int op1, int op2);
int operXor(int op1, int op2);
int operSub(int op1, int op2);
int operAdd(int op1, int op2);
int operDiv(int op1, int op2);
int operMul(int op1, int op2);
int operEqual(int op1, int op2);
int operNotEqual(int op1, int op2);
int operGreater(int op1, int op2);
int operLess(int op1, int op2);
int operGreaterOrEqual(int op1, int op2);
int operLessOrEqual(int op1, int op2);
int operMod(int op1, int op2);
void setupCommandList();
const GPL2Command *findCommand(byte num, byte subnum);
int handleMathExpression(Common::MemoryReadStream &reader);
DraciEngine *_vm;
};
}
#endif // DRACI_SCRIPT_H
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