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1 files changed, 111 insertions, 0 deletions

diff --git a/noncore/tools/calc2/engine.h b/noncore/tools/calc2/engine.h
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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