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/**********************************************************************
** Copyright (C) 2000 Trolltech AS. All rights reserved.
**
** This file is part of Qtopia Environment.
**
** This file may be distributed and/or modified under the terms of the
** GNU General Public License version 2 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
** See http://www.trolltech.com/gpl/ for GPL licensing information.
**
** Contact info@trolltech.com if any conditions of this licensing are
** not clear to you.
**
**********************************************************************/
#ifndef ENGINE_H
#define ENGINE_H
#include <qwidget.h>
#include <qstack.h> // Instruction stack
#include <qstring.h> // Display
#include "instruction.h"
// Possible states
enum State {
sStart, // start inputting a new number
sAppend, // continue inputting a number
sError
};
// State machine
class Engine:public QWidget {
Q_OBJECT
public:
Engine (QWidget * parent = 0, const char *name = 0):QWidget (parent, name) {
hardReset();
setRepresentation(rDec);
};
~Engine () { };
void immediateInstruction (Instruction *);
void pushInstruction (Instruction *);
void eval ();
void pushValue (char);
void del ();
void openBrace ();
void closeBrace ();
void softReset () { // clears the number being inputted
decimalPlaces = -1;
clearData(&num);
displayData(num);
state = sStart;
};
void hardReset () { // a "real" reset of the stack
stack.clear ();
memClear();
braces = 0;
softReset ();
};
void memSave () {
mem = num;
};
void memRecall () {
num = mem;
state = sStart;
displayData(num);
};
void memClear () {
clearData(&mem);
};
// rFraction will require a special display enabled here
void setRepresentation(Representation);
// you dont want to call this
void decBraces(void){ braces--; };
private:
void displayData(Data d);
void clearData(Data *d);
int calcBase();
Data evalStack (Data, bool);
Data num,mem;
State state;
QStack < Instruction > stack;
Representation currentRep;
int braces, decimalPlaces; // count of finishing 0's in num
QString displayString; // saves instatiating it over and over
signals:
void display(const QString &);
void display(double); // could get rid of this and
// use a QLabel instead.
void setHexMode();
void setBinMode();
void setDecMode();
void setOctMode();
};
#endif
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