decayParser.cc

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// -*- C++ -*-
//
// Package:     CandCombiner
// Class  :     decayParser
//
// Implementation:
//     <Notes on implementation>
//
// Original Author:
//         Created:  Sun Aug  7 20:26:31 EDT 2005
// $Id: decayParser.cc,v 1.1 2009/03/03 13:50:55 llista Exp $
//
#include "CommonTools/CandAlgos/interface/decayParser.h"
 
#include <boost/spirit/include/classic_core.hpp>
#include <boost/spirit/include/classic_push_back_actor.hpp>
 
#include <vector>
 
using namespace boost::spirit;
using namespace std;
using namespace boost::spirit::classic;
namespace cand {
  namespace parser {
 
    class ModeSetter {
    public:
      ModeSetter(vector<ConjInfo>& iVect, ConjInfo::Mode iMode) : conjInfo_(iVect), mode_(iMode) {}
      void operator()(const char) const { conjInfo_.back().mode_ = mode_; }
 
    private:
      vector<ConjInfo>& conjInfo_;
      ConjInfo::Mode mode_;
    };
 
    typedef scanner_policies<skip_parser_iteration_policy<nothing_parser, iteration_policy>, match_policy, action_policy>
        ScannerPolicy;
    typedef scanner<const char*, ScannerPolicy> ScannerUsed_1;
    typedef rule<ScannerUsed_1> Rule_1;
 
    bool decayParser(const string& iValue, vector<ConjInfo>& oStrings) {
      using namespace boost::spirit;
 
      Rule_1 label = ((+alnum_p) >> *ch_p(':') >> *ch_p('_') >> *alnum_p)[push_back_a(oStrings)];
      Rule_1 conj = (ch_p('@') >> !((ch_p('b') >> ch_p('a') >> ch_p('r')[ModeSetter(oStrings, ConjInfo::kBar)]) |
                                    ch_p('+')[ModeSetter(oStrings, ConjInfo::kPlus)] |
                                    ch_p('-')[ModeSetter(oStrings, ConjInfo::kMinus)]));
 
      return parse(iValue.c_str(), ((label >> !conj) % blank_p), nothing_p).full;
    }
  }  // namespace parser
}  // namespace cand