strip_comments.cpp

#include <string>
#include <unordered_set>

std::string stripComments(
  const std::string& str,
  const std::unordered_set<char>& markers
) {
  std::string s;
  bool b = false;
  for (size_t i = 0; i < str.length(); ++i) {
    if (markers.find(str[i]) != markers.end()) {
      b = (true);
      continue; 
    }
    b = (str[i] == '\n') ? (false) : (b);
    if(!b)
      s += str[i];
  }
  for (size_t i = 0; i <= s.length(); ++i) {
      if(s[i] == '\n' || s[i] == '\0'){
          if(i == 0) continue;
          size_t j = (i);
          --j;
          while(1) {
               if (std::isalpha(static_cast<unsigned char>(s[j])))
                    break; 
                s.erase(j, 1);
                if (j == 0) break;
                --j;
          }
      }      
  }
  return (s);
}