Real.cpp

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// ------------------------------------------------------------------------
// $RCSfile: Real.cpp,v $
// ------------------------------------------------------------------------
// $Revision: 1.2 $
// ------------------------------------------------------------------------
// Copyright: see Copyright.readme
// ------------------------------------------------------------------------
//
// Class Real:
//   A class used to parse real attributes.
//
// ------------------------------------------------------------------------
//
// $Date: 2000/12/15 10:08:28 $
// $Author: opal $
//
// ------------------------------------------------------------------------
 
#include "Attributes/Real.h"
#include "AbstractObjects/Expressions.h"
#include "Expressions/SAutomatic.h"
#include "Expressions/SDeferred.h"
#include "Expressions/SValue.h"
#include "Parser/SimpleStatement.h"
#include "Parser/StringStream.h"
#include "Parser/Token.h"
#include "Utilities/ClassicException.h"
#include "Utilities/ParseError.h"
 
using namespace Expressions;
using std::cerr;
using std::endl;
 
 
// Class Real
// ------------------------------------------------------------------------
 
namespace Attributes {
 
    Real::Real(const std::string &name, const std::string &help):
        AttributeHandler(name, help, 0)
    {}
 
 
    Real::~Real()
    {}
 
 
    const std::string &Real::getType() const {
        static const std::string type("real");
        return type;
    }
 
 
    void Real::parse(Attribute &attr, Statement &statement, bool eval) const {
        PtrToScalar<double> expr = parseReal(statement);
 
        if(eval || expr->isConstant()) {
            attr.set(new SValue<double>(expr->evaluate()));
        } else if(isDeferred()) {
            attr.set(new SDeferred<double>(expr));
        } else {
            attr.set(new SAutomatic<double>(expr));
        }
    }
 
};