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