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  1. //#define BOOST_SPIRIT_DEBUG
  2. #include <boost/spirit/include/qi.hpp>
  3.  
  4. namespace qi = boost::spirit::qi;
  5.  
  6. typedef std::string Column;
  7. typedef std::vector<Column> Columns;
  8. typedef Columns CsvLine;
  9. typedef std::vector<CsvLine> CsvFile;
  10.  
  11. template <typename It>
  12. struct CsvGrammar : qi::grammar<It, CsvFile(), qi::blank_type>
  13. {
  14.     CsvGrammar() : CsvGrammar::base_type(start)
  15.     {
  16.         static const char colsep = ',';
  17.  
  18.         start  = -line % qi::eol;
  19.         line   = column % colsep;
  20.         column = quoted | *~qi::char_(colsep);
  21.         quoted = '"' >> *("\"\"" | ~qi::char_('"')) >> '"';
  22.  
  23.         BOOST_SPIRIT_DEBUG_NODES((start)(line)(column)(quoted));
  24.     }
  25.   private:
  26.     qi::rule<It, CsvFile(), qi::blank_type> start;
  27.     qi::rule<It, CsvLine(), qi::blank_type> line;
  28.     qi::rule<It, Column(),  qi::blank_type> column;
  29.     qi::rule<It, std::string()> quoted;
  30. };
  31.  
  32. int main()
  33. {
  34.     const std::string s = "1997,Ford,E350,\"ac, abs, moon\",\"\"\"rusty\"\"\",3001.00";
  35.  
  36.     typedef std::string::const_iterator It;
  37.     It f(s.begin()), l(s.end());
  38.     CsvGrammar<It> p;
  39.  
  40.     CsvFile parsed;
  41.     bool ok = qi::phrase_parse(f,l,p,qi::blank,parsed);
  42.  
  43.     if (ok)
  44.     {
  45.         for (CsvFile::const_iterator lit = parsed.begin(); lit != parsed.end(); ++lit) {
  46.             for (Columns::const_iterator cit = lit->begin(); cit != lit->end(); ++cit)
  47.                 std::cout << '[' << *cit << ']';
  48.             std::cout << std::endl;
  49.         }
  50.     } else
  51.     {
  52.         std::cout << "Parse failed\n";
  53.     }
  54.  
  55.     if (f!=l)
  56.         std::cout << "Remaining unparsed: '" << std::string(f,l) << "'\n";
  57. }
  58.  
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https://ideone.com/VVVTYe
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
secret

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