ceph/src/boost/libs/spirit/example/x3/employee.cpp

   1 /*=============================================================================
   2     Copyright (c) 2002-2015 Joel de Guzman
   3
   4     Distributed under the Boost Software License, Version 1.0. (See accompanying
   5     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   6 =============================================================================*/
   7 ///////////////////////////////////////////////////////////////////////////////
   8 //
   9 //  A parser for arbitrary tuples. This example presents a parser
  10 //  for an employee structure.
  11 //
  12 //  [ JDG May 9, 2007 ]
  13 //  [ JDG May 13, 2015 ]    spirit X3
  14 //
  15 ///////////////////////////////////////////////////////////////////////////////
  16
  17 #include <boost/config/warning_disable.hpp>
  18 #include <boost/spirit/home/x3.hpp>
  19 #include <boost/fusion/include/adapt_struct.hpp>
  20 #include <boost/fusion/include/io.hpp>
  21
  22 #include <iostream>
  23 #include <string>
  24
  25 namespace client { namespace ast
  26 {
  27     ///////////////////////////////////////////////////////////////////////////
  28     //  Our employee struct
  29     ///////////////////////////////////////////////////////////////////////////
  30     struct employee
  31     {
  32         int age;
  33         std::string forename;
  34         std::string surname;
  35         double salary;
  36     };
  37
  38     using boost::fusion::operator<<;
  39 }}
  40
  41 // We need to tell fusion about our employee struct
  42 // to make it a first-class fusion citizen. This has to
  43 // be in global scope.
  44
  45 BOOST_FUSION_ADAPT_STRUCT(client::ast::employee,
  46     age, forename, surname, salary
  47 )
  48
  49 namespace client
  50 {
  51     ///////////////////////////////////////////////////////////////////////////////
  52     //  Our employee parser
  53     ///////////////////////////////////////////////////////////////////////////////
  54     namespace parser
  55     {
  56         namespace x3 = boost::spirit::x3;
  57         namespace ascii = boost::spirit::x3::ascii;
  58
  59         using x3::int_;
  60         using x3::lit;
  61         using x3::double_;
  62         using x3::lexeme;
  63         using ascii::char_;
  64
  65         x3::rule<class employee, ast::employee> const employee = "employee";
  66
  67         auto const quoted_string = lexeme['"' >> +(char_ - '"') >> '"'];
  68
  69         auto const employee_def =
  70             lit("employee")
  71             >> '{'
  72             >>  int_ >> ','
  73             >>  quoted_string >> ','
  74             >>  quoted_string >> ','
  75             >>  double_
  76             >>  '}'
  77             ;
  78
  79         BOOST_SPIRIT_DEFINE(employee);
  80     }
  81 }
  82
  83 ////////////////////////////////////////////////////////////////////////////
  84 //  Main program
  85 ////////////////////////////////////////////////////////////////////////////
  86 int
  87 main()
  88 {
  89     std::cout << "/////////////////////////////////////////////////////////\n\n";
  90     std::cout << "\t\tAn employee parser for Spirit...\n\n";
  91     std::cout << "/////////////////////////////////////////////////////////\n\n";
  92
  93     std::cout
  94         << "Give me an employee of the form :"
  95         << "employee{age, \"forename\", \"surname\", salary } \n";
  96     std::cout << "Type [q or Q] to quit\n\n";
  97
  98     using boost::spirit::x3::ascii::space;
  99     typedef std::string::const_iterator iterator_type;
 100     using client::parser::employee;
 101
 102     std::string str;
 103     while (getline(std::cin, str))
 104     {
 105         if (str.empty() || str[0] == 'q' || str[0] == 'Q')
 106             break;
 107
 108         client::ast::employee emp;
 109         iterator_type iter = str.begin();
 110         iterator_type const end = str.end();
 111         bool r = phrase_parse(iter, end, employee, space, emp);
 112
 113         if (r && iter == end)
 114         {
 115             std::cout << boost::fusion::tuple_open('[');
 116             std::cout << boost::fusion::tuple_close(']');
 117             std::cout << boost::fusion::tuple_delimiter(", ");
 118
 119             std::cout << "-------------------------\n";
 120             std::cout << "Parsing succeeded\n";
 121             std::cout << "got: " << emp << std::endl;
 122             std::cout << "\n-------------------------\n";
 123         }
 124         else
 125         {
 126             std::cout << "-------------------------\n";
 127             std::cout << "Parsing failed\n";
 128             std::cout << "-------------------------\n";
 129         }
 130     }
 131
 132     std::cout << "Bye... :-) \n\n";
 133     return 0;
 134 }