Go to the documentation of this file.00001 #ifndef CommonTools_Utils_expressionParset_h
00002 #define CommonTools_Utils_expressionParset_h
00003 #include "CommonTools/Utils/src/ExpressionPtr.h"
00004 #include "CommonTools/Utils/src/Grammar.h"
00005 #include "FWCore/Utilities/interface/EDMException.h"
00006 #include <string>
00007
00008 namespace reco {
00009 namespace parser {
00010 template<typename T>
00011 bool expressionParser( const std::string & value, ExpressionPtr & expr, bool lazy=false) {
00012 using namespace boost::spirit::classic;
00013 Grammar grammar(expr, (const T*)(0), lazy);
00014 bool returnValue = false;
00015 const char* startingFrom = value.c_str();
00016 try {
00017 returnValue=parse(startingFrom, grammar.use_parser<1>() >> end_p, space_p).full;
00018 } catch(BaseException&e){
00019 throw edm::Exception(edm::errors::Configuration)<<"Expression parser error:"<<baseExceptionWhat(e)<<" (char "<<e.where-startingFrom<<")\n";
00020 }
00021 return returnValue;
00022 }
00023 }
00024 }
00025
00026 #endif
1.7.3