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  1. struct stringdata
  2. {
  3.   string tag, value;
  4. }
  5.  
  6. void readLine(ifstream &inFile, stringdata &data)
  7. {
  8.   string dataLine;
  9.   int start, readLength;
  10.   bool validData = false;
  11.  
  12.   data.value = "";
  13.  
  14.   while (!validData && inFile && !inFile.eof()) //Checks if valid data has been read, the file is still good, and not at the end of the file.
  15.   {
  16.     getline(inFile, dataLine);
  17.  
  18.     if (dataLine.find('=') != string::npos && dataLine != "")
  19.     {
  20.       while (dataLine.at(0) == ' ' && dataLine != "") //Checks for leading whitespace and empty strings
  21.       {
  22.         dataLine = dataLine.substr(1, dataLine.length());
  23.       }
  24.  
  25.       if (dataLine.at(0) != '#') // Leading comment, ignore line
  26.       {
  27.         start = dataLine.find('=');
  28.         char positionChar;
  29.  
  30.         do //Finds a non whitespace character to the left of the equal sign, giving us the tag
  31.         {
  32.           start--;
  33.           positionChar = dataLine.at(start);
  34.         }while (positionChar == ' ');
  35.  
  36.         data.tag = dataLine.substr(0, start + 1);
  37.  
  38.         start = dataLine.find('=');
  39.  
  40.         do //Finds the start of the value
  41.         {
  42.           start++;
  43.           positionChar = dataLine.at(start);
  44.         }while (positionChar == ' ');
  45.  
  46.         while (dataLine.at(dataLine.length() - 1) == ' ') //Checks for and cleans up trailing whitespace
  47.         {
  48.           dataLine = dataLine.substr(0, dataLine.length() - 1);
  49.         }
  50.  
  51.         if (dataLine.find('#') != string::npos) //If a comment tag is found somewhere in the string
  52.         {
  53.           readLength = dataLine.find('#'); //Find the comment
  54.  
  55.           do //and read backwards from the comment to the value
  56.           {
  57.             readLength--;
  58.             positionChar = dataLine.at(readLength);
  59.           }while (positionChar == ' ');
  60.  
  61.           readLength = (readLength - start) + 1; //Calculate the length of the value for substringing
  62.         }
  63.         else
  64.           readLength =  dataLine.length() - start + 1; //Calculate the length of the value for substringing
  65.  
  66.         data.value = dataLine.substr(start, readLength);
  67.  
  68.         validData = true;
  69.       }
  70.     }
  71.     else if (dataLine.find(ECHO) != string::npos)
  72.     {
  73.       while (dataLine.at(0) == ' ' && dataLine != "") //Checks for leading whitespace and empty strings
  74.       {
  75.         dataLine = dataLine.substr(1, dataLine.length());
  76.       }
  77.       if (dataLine.at(0) != '#')
  78.         echoDebug = true;
  79.     }
  80.     else if (dataLine.find('<') != string::npos && dataLine.find('>') != string::npos ) //Header tag
  81.     {
  82.       while (dataLine.at(0) == ' ' && dataLine != "") //Checks for leading whitespace and empty strings
  83.       {
  84.         dataLine = dataLine.substr(1, dataLine.length());
  85.       }
  86.  
  87.       if (dataLine.at(0) != '#')
  88.       {
  89.         data.tag = dataLine.substr(dataLine.find('<'), dataLine.find('>') - dataLine.find('<') + 1);
  90.         data.value = "";
  91.         validData = true;
  92.       }
  93.       //      if (echoDebug)
  94.       //        cout << "Tag: " << data.tag << endl;
  95.  
  96.     }
  97.     else if (dataLine.find('=') == string::npos && dataLine != "") //Missing a "=", blank lines are ignored
  98.     {
  99.       while (dataLine.at(0) == ' ' && dataLine != "") //Checks for leading whitespace and empty strings
  100.       {
  101.         dataLine = dataLine.substr(1, dataLine.length());
  102.       }
  103.  
  104.       if (dataLine.at(0) != '#')
  105.         cout << "Line \"" << dataLine << "\" is missing something important. (Make sure you have an '=' somewhere)" << endl;
  106.     }
  107.     else if (!inFile && !inFile.eof()) //File is bad and not just at the end of the file
  108.     {
  109.       cout << "File read error. Please make sure you are using a valid file" << endl
  110.            << "Last line read: \"" << dataLine << "\"." << endl
  111.            << "Now terminating" << endl;
  112.       exit(1); //Terminate program as invalid data is crashable
  113.     }
  114.   }
  115. }
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https://ideone.com/FZ1EP
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
public

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