/data/refman/pasoursint/CMSSW_5_3_1/src/CommonTools/Utils/src/cutParser.cc

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#include "CommonTools/Utils/interface/cutParser.h"
#include "CommonTools/Utils/src/AnyObjSelector.h"
#include "CommonTools/Utils/src/Grammar.h"
#include "FWCore/Utilities/interface/EDMException.h"

using namespace reco::parser;
bool reco::parser::cutParser(const Reflex::Type &t, const std::string & cut, SelectorPtr & sel, bool lazy=false) {
    bool justBlanks = true;
    for(std::string::const_iterator c = cut.begin(); c != cut.end(); ++c) {
        if(*c != ' ') { justBlanks = false; break; }
    }
    if(justBlanks) {
        sel = SelectorPtr(new AnyObjSelector);
        return true;
    } else {
        using namespace boost::spirit::classic;
        Grammar grammar(sel, t, lazy);
        bool returnValue = false;
        const char* startingFrom =cut.c_str();
        try {
            returnValue = parse(startingFrom, grammar.use_parser<0>() >> end_p, space_p).full;
        } 
        catch(BaseException& e) {
            throw edm::Exception(edm::errors::Configuration)<<"Cut parser error:"<<baseExceptionWhat(e)<<" (char "<<e.where-startingFrom<<")\n";
        }
        return returnValue;
    }
}