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  1. #include <iostream>
  2. #include <map>
  3. #include <string>
  4. #include <vector>
  5.  
  6. int main() {
  7.     std::string str("0=My,1=comma,2=separated,3=string,0=with,3=repeated,7=IDs");
  8.     std::vector<std::string> out0;
  9.     std::map<std::string, std::string> out;
  10.  
  11.     size_t startPos = 0, delimPos, nameStart, nameEnd, valueStart, valueEnd;
  12.  
  13.     // loop over the string, collecting "key=value" pairs
  14.     while (startPos < str.size()){
  15.         nameStart = startPos;
  16.         delimPos = str.find_first_of("=,", startPos, 2);
  17.         if (delimPos == std::string::npos) {
  18.             nameEnd = valueStart = valueEnd = str.size();
  19.         }
  20.         else {
  21.             nameEnd = delimPos;
  22.             if (str[delimPos] == '=') {
  23.                 valueStart = nameEnd + 1;
  24.                 valueEnd = str.find(',', valueStart);
  25.                 if (valueEnd == std::string::npos) {
  26.                     valueEnd = str.size();
  27.                 }
  28.             }
  29.             else {
  30.                 valueStart = valueEnd = nameEnd;
  31.             }
  32.         }
  33.  
  34.         // TODO: if needed, adjust nameStart/End and valueStartEnd to
  35.         // ignore leading/trailing whitespace around the name and value
  36.         // substrings...
  37.  
  38.         if (str.compare(nameStart, nameEnd - nameStart, "0", 1) == 0) {
  39.             out0.push_back(str.substr(valueStart, valueEnd - valueStart));
  40.         } else {
  41.             out[str.substr(nameStart, nameEnd - nameStart)] = str.substr(valueStart, valueEnd - valueStart);
  42.         }
  43.  
  44.         startPos = valueEnd + 1;
  45.     }
  46.  
  47.     // print out the data structures
  48.     std::cout << "out0:";
  49.     for (auto& entry : out0) {
  50.         std::cout << ' ' << entry;
  51.     }
  52.     std::cout << std::endl;
  53.  
  54.     std::cout << "out:";
  55.     for (auto &it : out) {
  56.         std::cout << ' ' << it.first << '=' << it.second;
  57.     }
  58. }
  59.  
Success #stdin #stdout 0s 4372KB
comments (?)
stdin 
Standard input is empty
stdout 
out0: My with
out: 1=comma 2=separated 3=repeated 7=IDs
https://ideone.com/69a07J
language:
C++ (gcc 8.3)
created:
6 years ago
visibility:
public

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