/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_6_2_7/src/CommonTools/Utils/src/ExpressionVarSetter.cc

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#include "CommonTools/Utils/src/ExpressionVarSetter.h"
#include "CommonTools/Utils/src/ExpressionVar.h"
#include "CommonTools/Utils/src/returnType.h"
#include "CommonTools/Utils/interface/Exception.h"
#include <string>
using namespace reco::parser;
using namespace std;

void ExpressionVarSetter::operator()(const char * begin, const char* end) const {
  //std::cerr << "ExpressionVarSetter: Pushed [" << std::string(begin,end) << "]" << std::endl;  
  if (!methStack_.empty())          push(begin,end);
  else if (!lazyMethStack_.empty()) lazyPush(begin,end);
  else throw Exception(begin) << " Expression didn't parse neither hastily nor lazyly. This must not happen.\n";
}

void ExpressionVarSetter::push(const char *begin, const char *end) const {
  edm::TypeWithDict type = typeStack_.back();
  method::TypeCode retType = reco::typeCode(type);
  if(retType == method::invalid) {
    throw  Exception(begin)
      << "member \"" << methStack_.back().methodName() << "\" has an invalid return type: \"" 
      <<  methStack_.back().returnTypeName() << "\"";
  }
  if(!ExpressionVar::isValidReturnType(retType)) {
     throw Exception(begin)
       << "member \"" << methStack_.back().methodName() 
       << "\" return type is \"" << methStack_.back().returnTypeName() 
       << "\" which is not convertible to double.";
  }
  
  exprStack_.push_back(boost::shared_ptr<ExpressionBase>(new ExpressionVar(methStack_, retType)));
  methStack_.clear();
  typeStack_.resize(1);
}

void ExpressionVarSetter::lazyPush(const char *begin, const char *end) const {
  exprStack_.push_back(boost::shared_ptr<ExpressionBase>(new ExpressionLazyVar(lazyMethStack_)));
  lazyMethStack_.clear();
  typeStack_.resize(1);
}