value.h

/* Swinder - Portable library for spreadsheet 
   Copyright (C) 2003 Ariya Hidayat <ariya@kde.org>
 
   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public
   License as published by the Free Software Foundation; either
   version 2 of the License, or (at your option) any later version.
   
   This library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.
 
   You should have received a copy of the GNU Library General Public License
   along with this library; see the file COPYING.LIB.  If not, write to
   the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA
*/
 
#ifndef SWINDER_VALUE_H
#define SWINDER_VALUE_H
 
#include <iostream>
#include "ustring.h"
 
namespace Swinder
{
 
class ValueData;
 
 
 
class Value
{
 
  public:
 
    typedef enum {
      Empty,
      Boolean,
      Integer,
      Float,
      String,
      CellRange, // not used yet
      Array,     // not used yet
      Error
    } Type;
 
    Value();
 
    Value( Type _type );
 
    virtual ~Value();
 
    Value( const Value& _value );
 
    Value& operator= ( const Value& _value );
 
    Value& assign( const Value& _value );
 
    Value( bool b );
 
    Value( int i );
 
    Value( double f );
 
    Value( const UString& s );
 
    Type type() const;
 
    bool isEmpty() const { return type() == Empty; }
 
    bool isBoolean() const { return type() == Boolean; }
 
    bool isInteger() const { return type() == Integer; }
 
    bool isFloat() const { return type() == Float; }
 
    bool isNumber() const { return (type() == Integer) || (type() == Float); }
 
    bool isString() const { return type() == String; }
 
    bool isError() const { return type() == Error; }
 
    void setValue( const Value& v );
 
    void setValue( bool b );
 
    void setValue( int i );
 
    void setValue( double f );
 
    void setValue( const UString& s );
 
    void setError( const UString& msg );
 
    bool asBoolean() const;
 
    int asInteger() const;
 
    double asFloat() const;
 
    UString asString() const;
 
    UString errorMessage() const;
 
    void detach();
 
    static const Value& empty();
 
    static const Value& errorDIV0();
 
    static const Value& errorNA();
 
    static const Value& errorNAME();
 
    static const Value& errorNUM();
 
    static const Value& errorNULL();
 
    static const Value& errorREF();
 
    static const Value& errorVALUE();
 
  protected:
 
    ValueData* d; // can't never be 0
};
 
std::ostream& operator<<( std::ostream& s, Value value );
 
} // namespace Swinder
 
#endif // SWINDER_VALUE_H