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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.
**
**********************************************************************/
#include "engine.h"
#include <qstring.h>
#include <math.h>
#include <qlcdnumber.h>
Data Engine::evalStack (Data num, bool inbrace = FALSE)
{
if (state != sError) {
Instruction *i;
// Pop the next op from the stack
while (!stack.isEmpty () && (braces || !inbrace)) {
i = stack.pop ();
// Check this ops prec vs next ops prec
if (!stack.isEmpty ())
if (i->precedence <= stack.top()->precedence)
i->acc = evalStack (i->acc, inbrace);
// Evaluate this instruction
num = i->eval (num);
// Error-check ( change this to work for all types )
if (isnan (num.dbl) || isinf (num.dbl)) {
qDebug ("bad result from operation");
state = sError;
clearData(&num);
return num;
}
}
}
return num;
}
// Plugins call this to request the stack be evaluated
void Engine::eval ()
{
num = evalStack (num);
if (state != sError) {
displayData(num);
state = sStart;
}
// if the user didnt close all their braces, its no big deal
braces = 0;
}
void Engine::immediateInstruction (Instruction * i)
{
if (state != sError) {
i->setRep(currentRep);
num = i->eval (num);
displayData(num);
state = sStart;
}
}
void Engine::pushInstruction (Instruction * i)
{
if (state != sError) {
i->setRep(currentRep);
i->acc = num;
stack.push (i);
state = sStart;
}
}
void Engine::pushValue (char v)
{
if (state == sAppend) {
bool ok = FALSE;
switch (currentRep) {
case rDouble:
displayString.append(v);
num.dbl=displayString.toDouble(&ok);
break;
case rFraction:
break;
default:
displayString.append(v);
num.i=displayString.toInt(&ok, calcBase());
};
if (!ok) {
state = sError;
qDebug("pushValue() - num->string conversion");
} else {
const QString constString = displayString;
emit(display(constString));
};
} else if (state == sStart) {
softReset();
displayString.truncate(0);
state = sAppend;
pushValue (v);
} else if (state == sError) {
qDebug ("in error state");
return;
}
}
void Engine::del ()
{
bool ok;
switch (currentRep) {
case rDouble:
displayString.truncate(displayString.length());
num.dbl=displayString.toDouble(&ok);
break;
case rFraction:
qDebug("not available");
break;
default:
displayString.truncate(displayString.length());
num.i = displayString.toInt(&ok, calcBase());
};
if (!ok) {
state = sError;
qDebug("del() - num->string conversion");
} else {
const QString constString = displayString;
emit(display(constString));
};
}
void Engine::displayData(Data d) {
switch (currentRep) {
case rDouble:
displayString.setNum(d.dbl);
break;
case rFraction:
qDebug("fractional display not yet impl");
break;
default:
displayString.setNum(d.i, calcBase());
break;
};
const QString constString= displayString;
emit(display(constString));
}
// Returns the base when Rep is an integer type
int Engine::calcBase () {
switch (currentRep) {
case rBin:
return 2;
case rOct:
return 8;
case rDec:
return 10;
case rHex:
return 16;
default:
state = sError;
qDebug("Error - attempt to calc base for non-integer");
return 10;
};
}
// Special instruction for internal use only
class iOpenBrace:public Instruction {
public:
iOpenBrace (Engine *e):Instruction (100) {engine = e;};
~iOpenBrace () {};
Data eval (Data num) {
engine->decBraces();
return num;
};
private:
Engine *engine;
};
void Engine::openBrace() {
pushInstruction(new iOpenBrace(this));
}
void Engine::closeBrace() {
braces++;evalStack(num,TRUE);
}
// will need to show and hide display widgets
void Engine::setRepresentation(Representation r) {
currentRep = r;
clearData(&num);
clearData(&mem);
state = sStart;
}
void Engine::clearData(Data *d) {
d->i = d->fraction.numerator = d->fraction.denominator = 0;
d->dbl = 0;
}
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