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  1. #include <map>
  2. #include <sstream>
  3. #include <stdexcept>
  4. #include <string>
  5.  
  6. std::map<std::string, std::string> options; // global?
  7.  
  8. void parse(std::istream & cfgfile)
  9. {
  10.     for (std::string line; std::getline(cfgfile, line); )
  11.     {
  12.         std::istringstream iss(line);
  13.         std::string id, eq, val;
  14.  
  15.         bool error = false;
  16.  
  17.         if (!(iss >> id))
  18.         {
  19.             error = true;
  20.         }
  21.         else if (id[0] == '#')
  22.         {
  23.             continue;
  24.         }
  25.         else if (!(iss >> eq >> val >> std::ws) || eq != "=" || iss.get() != EOF)
  26.         {
  27.             error = true;
  28.         }
  29.  
  30.         if (error) { throw std::runtime_error("Parse error"); }
  31.  
  32.         options[id] = val;
  33.     }
  34. }
  35.  
  36. #include <iostream>
  37.  
  38. int main()
  39. {
  40. 	parse(std::cin);
  41. 	for (const auto& p : options)
  42. 	{
  43. 		std::cout << "Option['" << p.first << "'] = " << p.second << '\n';
  44. 	}
  45. }
Success #stdin #stdout 0s 3468KB
comments (?)
stdin
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a = 10
b = bob
# this is a comment
c = 1,2,3
stdout
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Option['a'] = 10
Option['b'] = bob
Option['c'] = 1,2,3
https://ideone.com/evTjHO
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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