PixelConditionsAlgorithms Namespace Reference

Functions
std::vector< std::pair< int, int > >	parseDeadMapString (const std::string &s)

Function Documentation

parseDeadMapString()

std::vector< std::pair< int, int > > PixelConditionsAlgorithms::parseDeadMapString

(

const std::string &

s

)

Definition at line 19 of file StringUtilities.cxx.

                                         {
    std::vector<std::pair<int, int>> result;
    //the Trigger_athenaHLT_v1Cosmic CI test returns a pair of empty braces, "{}"; trap this
    //in fact the minimal useful string would be {"d":d}, where d is a digit
    if (s.size()<7) return result;
    //a valid string is json, enclosed in braces.
    const bool is_valid = (s.front() == '{') and (s.back() == '}');
    if (not is_valid) return result;
    auto is_digit=[](const char c)->bool{
      return (c>='0') and (c<='9');
    };
    auto is_quote=[](const char c)->bool{
      return (c=='"');
    };
    const auto *pc=s.data();
    const auto *const pcEnd=pc+s.size();
    int hash{};
    int status{};
    static constexpr  std::errc success{};
    
    //database strings look like : {"12":0,"19":0,"53":0,"64":256}
    for (;pc<pcEnd;++pc){
      //fast-forward to the first quote
      pc=std::find_if(pc,pcEnd,is_quote);
      //the following converts everything up to the first non-digit character 
      //the ptr is pointing to the first non-digit character (which should be a quote)
      const auto &[ptr, errCode] = std::from_chars(++pc, pcEnd, hash);
      if (errCode!= success){
        throw std::runtime_error("Bad hash conversion from database string in PixelConditionsAlgorithms::parseDeadMapString:" +s+".");
      }
      //fast-forward to the next digit
      pc=std::find_if(ptr,pcEnd,is_digit);
      const auto &[ptr2, errCode2] = std::from_chars(pc, pcEnd, status);
      if (errCode2!= success){
        throw std::runtime_error("Bad status conversion from database string in PixelConditionsAlgorithms::parseDeadMapString:"+s+".");
      }
      pc=ptr2;
      result.emplace_back(hash, status);
    }
    
    //
    return result;
  }