mirror of
https://github.com/libretro/scummvm.git
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121 lines
3.0 KiB
C++
121 lines
3.0 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* $URL$
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* $Id$
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*
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*/
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#ifndef DRACI_SCRIPT_H
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#define DRACI_SCRIPT_H
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#include "common/str.h"
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#include "common/stream.h"
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#include "common/queue.h"
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namespace Draci {
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/** The maximum number of parameters for a GPL command */
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const int kMaxParams = 3;
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class DraciEngine;
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class Script;
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enum {
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kNumCommands = 55
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};
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typedef void (Script::* GPLHandler)(Common::Queue<int> &);
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typedef int (Script::* GPLOperatorHandler)(int, int);
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/**
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* Represents a single command in the GPL scripting language bytecode.
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* Each command is represented in the bytecode by a command number and a
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* subnumber.
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*/
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struct GPL2Command {
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byte _number;
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byte _subNumber;
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Common::String _name;
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uint16 _numParams;
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int _paramTypes[kMaxParams];
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GPLHandler _handler;
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};
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struct GPL2Operator {
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Common::String _name;
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GPLOperatorHandler _handler;
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};
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/**
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* A convenience data type that holds both the actual bytecode and the
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* length of the bytecode. Passed to Script::run().
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*/
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struct GPL2Program {
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GPL2Program() : _bytecode(NULL), _length(0) {}
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byte *_bytecode;
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uint16 _length;
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};
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class Script {
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public:
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Script(DraciEngine *vm) : _vm(vm) { setupCommandList(); };
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int run(GPL2Program program, uint16 offset);
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private:
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/** List of all GPL commands. Initialised in the constructor. */
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const GPL2Command *_commandList;
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const GPL2Operator *_operatorList;
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void load(Common::Queue<int> ¶ms);
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void start(Common::Queue<int> ¶ms);
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int operAnd(int op1, int op2);
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int operOr(int op1, int op2);
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int operXor(int op1, int op2);
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int operSub(int op1, int op2);
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int operAdd(int op1, int op2);
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int operDiv(int op1, int op2);
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int operMul(int op1, int op2);
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int operEqual(int op1, int op2);
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int operNotEqual(int op1, int op2);
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int operGreater(int op1, int op2);
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int operLess(int op1, int op2);
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int operGreaterOrEqual(int op1, int op2);
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int operLessOrEqual(int op1, int op2);
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int operMod(int op1, int op2);
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void setupCommandList();
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const GPL2Command *findCommand(byte num, byte subnum);
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int handleMathExpression(Common::MemoryReadStream &reader);
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DraciEngine *_vm;
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};
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}
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#endif // DRACI_SCRIPT_H
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