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  1. #include <iostream>
  2. #include <string>
  3. #include <unordered_map>
  4.  
  5. std::string replaceVariables(std::string input, std::unordered_map<std::string, std::string>& variables) {
  6.   std::size_t start = input.find("%");
  7.   while (start != std::string::npos) {
  8.     std::size_t end = input.find("%", start + 1);
  9.     std::string key = input.substr(start + 1, end - start - 1);
  10.  
  11.     // Check if value also contains variables 
  12.     auto it = variables.find(key);
  13.     if (it != variables.end()) {
  14.       std::string value = it->second;
  15.       value = replaceVariables(value, variables);
  16.       input.replace(start, end - start + 1, value);
  17.     }
  18.     else {
  19.       input.replace(start, end - start + 1, key);  
  20.     }
  21.  
  22.     start = input.find("%", end);
  23.   }
  24.   return input;
  25. }
  26.  
  27. int main() {
  28.   std::unordered_map<std::string, std::string> variables = {
  29.     {"USER", "%XX%-admin"},
  30.     {"HOME", "/%USER%/home"},
  31.     {"XX", "YY"}
  32.   };
  33.  
  34.   std::string input = "I am %USER% My home is %HOME%";
  35.   std::string output = replaceVariables(input, variables);
  36.  
  37.   std::cout << output << std::endl;
  38.  
  39.   return 0;
  40. }
Success #stdin #stdout 0s 5284KB
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Standard input is empty
stdout
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I am YY-admin My home is /YY-admin/home
https://ideone.com/DbHATF
language:
C++ (gcc 8.3)
created:
43 days ago
visibility:
public

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