/data/refman/pasoursint/CMSSW_5_3_0/src/CommonTools/Utils/src/BinarySelectorSetter.h

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#ifndef CommonTools_Utils_BinarySelectorSetter_h
#define CommonTools_Utils_BinarySelectorSetter_h
/* \class reco::parser::BinarySelectorSetter
 *
 * Binary selector setter
 *
 * \author original version: Chris Jones, Cornell, 
 *         adapted to Reflex by Luca Lista, INFN
 *
 * \version $Revision: 1.1 $
 *
 */
#include "CommonTools/Utils/src/SelectorStack.h"
#include "CommonTools/Utils/src/ComparisonStack.h"
#include "CommonTools/Utils/src/ExpressionStack.h"
#include "CommonTools/Utils/src/BinarySelector.h"
#include "CommonTools/Utils/interface/Exception.h"
#include <boost/shared_ptr.hpp>

namespace reco {
  namespace parser {    
    class BinarySelectorSetter {
    public:
      BinarySelectorSetter(SelectorStack& selStack,
                            ComparisonStack& cmpStack, ExpressionStack& expStack) : 
        selStack_(selStack), cmpStack_(cmpStack), expStack_(expStack) { }
      
      void operator()(const char * begin, const char *) const {
        if(expStack_.empty())
          throw Exception(begin)
            << "Grammar error: empty expression stack. Please contact developer.";
        if(cmpStack_.empty())
          throw Exception(begin)
            << "Grammar error: empty comparator stack. Please contact developer." << "\"";
        boost::shared_ptr<ExpressionBase> rhs = expStack_.back(); expStack_.pop_back();
        boost::shared_ptr<ExpressionBase> lhs = expStack_.back(); expStack_.pop_back();
        boost::shared_ptr<ComparisonBase> comp = cmpStack_.back(); cmpStack_.pop_back();
#ifdef BOOST_SPIRIT_DEBUG 
        BOOST_SPIRIT_DEBUG_OUT << "pushing binary selector" << std::endl;
#endif
        selStack_.push_back(SelectorPtr(new BinarySelector(lhs, comp, rhs)));
      }
    private:
      SelectorStack & selStack_;
      ComparisonStack & cmpStack_;
      ExpressionStack & expStack_;
    };
  }
}

#endif