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  1. #include <iostream>
  2. #include <sstream>
  3.  
  4. using namespace std;
  5.  
  6. typedef unsigned char uchar;
  7.  
  8. enum Token {
  9.   TkMD = 'M' | 'D' << 8,
  10.   TkRP = 'R' | 'P' << 8,
  11.   TkTP = 'T' | 'P' << 8,
  12.   TkTT = 'T' | 'T' << 8
  13. };
  14.  
  15. inline Token tokenize(uchar c0, uchar c1) { return (Token)(c0 | c1 << 8); }
  16.  
  17. bool parse(istream &in)
  18. {
  19.   for (;;) {
  20.     // read command (2 chars)
  21.     char cmd[2];
  22.     if (in >> cmd[0] >> cmd[1]) {
  23.       //cout << "DEBUG: token: " << hex << tokenize(cmd[0], cmd[1]) << endl;
  24.       switch (tokenize(cmd[0], cmd[1])) {
  25.         case TkMD: { // MD<num>
  26.           int num;
  27.           if (in >> num) {
  28.             cout << "Received 'MD" << dec << num << "'." << endl;
  29.           } else {
  30.             cerr << "ERROR: Number expected after 'MD'!" << endl;
  31.             return false;
  32.           }
  33.         } break;
  34.         case TkRP:  { // RP<num>
  35.           int num;
  36.           if (in >> num) {
  37.             cout << "Received 'RP" << dec << num << "'." << endl;
  38.           } else {
  39.             cerr << "ERROR: Number expected after 'MD'!" << endl;
  40.             return false;
  41.           }
  42.         } break;
  43.         case TkTP: // TP
  44.           cout << "Received 'TP'." << endl;
  45.           break;
  46.         case TkTT: // TT
  47.           cout << "Received 'TT'." << endl;
  48.           break;
  49.         default:
  50.           cerr << "ERROR: Wrong command '" << cmd[0] << cmd[1] << "'!" << endl;
  51.           return false;
  52.       }
  53.     } else {
  54.       cerr << "ERROR: Command expected!" << endl;
  55.       return false;
  56.     }
  57.     // try to read separator
  58.     char sep;
  59.     if (!(in >> sep)) break; // probably EOF (further checks possible)
  60.     if (sep != ',') {
  61.       cerr << "ERROR: ',' expected!" << endl;
  62.       return false;
  63.     }
  64.   }
  65.   return true;
  66. }
  67.  
  68. int main()
  69. {
  70.   // test string
  71.   string sample("MD1,TP,RP5,TT,RP10");
  72.   // read test string
  73.   istringstream in(sample);
  74.   if (parse(in)) cout << "Done." << endl;
  75.   else cerr << "Interpreting aborted!" << endl;
  76.   // done
  77.   return 0;
  78. }
Success #stdin #stdout 0s 4556KB
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stdin
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Standard input is empty
stdout
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Received 'MD1'.
Received 'TP'.
Received 'RP5'.
Received 'TT'.
Received 'RP10'.
Done.
https://ideone.com/ljANSE
language:
C++ (gcc 8.3)
created:
8 years ago
visibility:
public

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