www.pudn.com > calculator.rar > engine.h


/****************************************************************************
**
** Copyright (C) 2000-2006 TROLLTECH ASA. All rights reserved.
**
** This file is part of the Phone Edition of the Qtopia Toolkit.
**
** Licensees holding a valid license agreement from Trolltech or any of its
** authorized distributors may use this file in accordance with
** the License Agreement provided with the Licensed Software.
**
** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
** information about Trolltech's Commercial License Agreements.
**
** Contact info@trolltech.com if any conditions of this licensing are
** not clear to you.
**
**
**
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
****************************************************************************/

#ifndef CALCULATOR_SYSTEM_H
#define CALCULATOR_SYSTEM_H

#include <qtopia/qtopiaglobal.h>
#include <qstack.h>
#include <qlist.h>
#include <qlabel.h>

#include "instruction.h"
#include "display.h"

class iBraceOpen;
enum State { sStart, sAppend, sError };
enum Error { eError, eOutOfRange, eDivZero, eNotSolvable, eNonPositive,
eNonInteger,eNotANumber,eInf,eNoDataFactory,eNegInf, eSurpassLimits };
enum ResetState { drNone, drSoft, drHard };

class Engine:public QObject {
Q_OBJECT
public:
Engine();
~Engine();

void registerInstruction(Instruction*);
void pushInstruction(QString);
void evaluate();

Data *getData();
void putData(Data *);

void dualReset();
void softReset();
void hardReset();
void push(char);
void push(QString);
void delChar();
void memoryRecall();
void memorySave();
void memoryReset();

void openBrace();
void closeBrace();

void setError(Error = eError, bool resetStack = true);
void setError(QString, bool resetStack = true);
void setDisplay(MyLcdDisplay *);
void setAccType(QString);
QString getDisplay();

#ifdef QTOPIA_PHONE
int numOps();
bool error();
#endif

signals:
void stackChanged();
void dualResetStateChanged(ResetState);


protected:
friend class iBraceOpen;
friend class iBraceOpenImpl;
friend class MyLcdDisplay;

void incBraceCount();
bool checkState();
QString errorString;
Instruction *resolve(QString);

private:
void doEvalStack(int=0,bool=false);
void evalStack(int=0,bool=false);
void executeInstructionOnStack(QString);
void executeInstructionOnStack(Instruction *);

void changeState(State);
void changeResetState(ResetState);

int previousInstructionsPrecedence;


State state;
ResetState drs;
#ifdef QTOPIA_PHONE
public:
#endif
QStack<QString*> iStack;
QStack<Data*> dStack;
private:
QStack <Data*> tmpDStack;

QString currentType,wantedType;
int braceCount;

QLabel *memMark,*kMark;
Data *mem;
Data *recoveredDStack;
Instruction *kDesc;

QList<Instruction*> list;
MyLcdDisplay *lcd;
};

extern Engine *systemEngine;
#endif //CALCULATOR_SYSTEM_H