ceph/src/boost/libs/spirit/example/qi/unescaped_string.cpp

   1 //  Copyright (c) 2010 Jeroen Habraken
   2 //
   3 //  Distributed under the Boost Software License, Version 1.0. (See accompanying
   4 //  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   5
   6 #include <boost/spirit/include/qi.hpp>
   7
   8 #include <iostream>
   9 #include <ostream>
  10 #include <string>
  11
  12 namespace client
  13 {
  14     namespace qi = boost::spirit::qi;
  15
  16     template <typename InputIterator>
  17     struct unescaped_string
  18         : qi::grammar<InputIterator, std::string(char const*)>
  19     {
  20         unescaped_string()
  21             : unescaped_string::base_type(unesc_str)
  22         {
  23             unesc_char.add("\\a", '\a')("\\b", '\b')("\\f", '\f')("\\n", '\n')
  24                           ("\\r", '\r')("\\t", '\t')("\\v", '\v')("\\\\", '\\')
  25                           ("\\\'", '\'')("\\\"", '\"')
  26                 ;
  27
  28             unesc_str = qi::lit(qi::_r1)
  29                     >> *(unesc_char | qi::alnum | "\\x" >> qi::hex)
  30                     >>  qi::lit(qi::_r1)
  31                 ;
  32         }
  33
  34         qi::rule<InputIterator, std::string(char const*)> unesc_str;
  35         qi::symbols<char const, char const> unesc_char;
  36     };
  37
  38 }
  39
  40 ///////////////////////////////////////////////////////////////////////////////
  41 //  Main program
  42 ///////////////////////////////////////////////////////////////////////////////
  43 int main()
  44 {
  45     namespace qi = boost::spirit::qi;
  46
  47     typedef std::string::const_iterator iterator_type;
  48
  49     std::string parsed;
  50
  51     std::string str("'''string\\x20to\\x20unescape\\x3a\\x20\\n\\r\\t\\\"\\'\\x41'''");
  52     char const* quote = "'''";
  53
  54     iterator_type iter = str.begin();
  55     iterator_type end = str.end();
  56
  57     client::unescaped_string<iterator_type> p;
  58     if (!qi::parse(iter, end, p(quote), parsed))
  59     {
  60         std::cout << "-------------------------\n";
  61         std::cout << "Parsing failed\n";
  62         std::cout << "-------------------------\n";
  63     }
  64     else
  65     {
  66         std::cout << "-------------------------\n";
  67         std::cout << "Parsed: " << parsed << "\n";
  68         std::cout << "-------------------------\n";
  69     }
  70
  71     return 0;
  72 }