152 lines
4.6 KiB
C++
152 lines
4.6 KiB
C++
/*=============================================================================
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Copyright (c) 2002-2010 Joel de Guzman
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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=============================================================================*/
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///////////////////////////////////////////////////////////////////////////////
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//
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// A parser for arbitrary tuples. This example presents a parser
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// for an employee structure.
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//
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// [ JDG May 9, 2007 ]
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//
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///////////////////////////////////////////////////////////////////////////////
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#include <boost/config/warning_disable.hpp>
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#include <boost/spirit/include/qi.hpp>
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#include <boost/spirit/include/phoenix_core.hpp>
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#include <boost/spirit/include/phoenix_operator.hpp>
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#include <boost/spirit/include/phoenix_object.hpp>
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#include <boost/fusion/include/adapt_struct.hpp>
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#include <boost/fusion/include/io.hpp>
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#include <iostream>
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#include <string>
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#include <complex>
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namespace client
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{
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namespace qi = boost::spirit::qi;
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namespace ascii = boost::spirit::ascii;
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///////////////////////////////////////////////////////////////////////////
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// Our employee struct
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///////////////////////////////////////////////////////////////////////////
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//[tutorial_employee_struct
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struct employee
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{
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int age;
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std::string surname;
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std::string forename;
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double salary;
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};
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//]
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}
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// We need to tell fusion about our employee struct
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// to make it a first-class fusion citizen. This has to
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// be in global scope.
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//[tutorial_employee_adapt_struct
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BOOST_FUSION_ADAPT_STRUCT(
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client::employee,
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(int, age)
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(std::string, surname)
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(std::string, forename)
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(double, salary)
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)
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//]
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namespace client
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{
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///////////////////////////////////////////////////////////////////////////////
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// Our employee parser
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///////////////////////////////////////////////////////////////////////////////
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//[tutorial_employee_parser
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template <typename Iterator>
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struct employee_parser : qi::grammar<Iterator, employee(), ascii::space_type>
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{
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employee_parser() : employee_parser::base_type(start)
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{
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using qi::int_;
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using qi::lit;
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using qi::double_;
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using qi::lexeme;
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using ascii::char_;
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quoted_string %= lexeme['"' >> +(char_ - '"') >> '"'];
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start %=
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lit("employee")
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>> '{'
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>> int_ >> ','
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>> quoted_string >> ','
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>> quoted_string >> ','
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>> double_
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>> '}'
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;
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}
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qi::rule<Iterator, std::string(), ascii::space_type> quoted_string;
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qi::rule<Iterator, employee(), ascii::space_type> start;
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};
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//]
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}
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////////////////////////////////////////////////////////////////////////////
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// Main program
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////////////////////////////////////////////////////////////////////////////
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int
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main()
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{
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std::cout << "/////////////////////////////////////////////////////////\n\n";
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std::cout << "\t\tAn employee parser for Spirit...\n\n";
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std::cout << "/////////////////////////////////////////////////////////\n\n";
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std::cout
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<< "Give me an employee of the form :"
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<< "employee{age, \"surname\", \"forename\", salary } \n";
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std::cout << "Type [q or Q] to quit\n\n";
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using boost::spirit::ascii::space;
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typedef std::string::const_iterator iterator_type;
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typedef client::employee_parser<iterator_type> employee_parser;
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employee_parser g; // Our grammar
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std::string str;
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while (getline(std::cin, str))
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{
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if (str.empty() || str[0] == 'q' || str[0] == 'Q')
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break;
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client::employee emp;
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std::string::const_iterator iter = str.begin();
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std::string::const_iterator end = str.end();
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bool r = phrase_parse(iter, end, g, space, emp);
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if (r && iter == end)
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{
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std::cout << boost::fusion::tuple_open('[');
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std::cout << boost::fusion::tuple_close(']');
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std::cout << boost::fusion::tuple_delimiter(", ");
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std::cout << "-------------------------\n";
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std::cout << "Parsing succeeded\n";
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std::cout << "got: " << boost::fusion::as_vector(emp) << std::endl;
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std::cout << "\n-------------------------\n";
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}
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else
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{
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std::cout << "-------------------------\n";
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std::cout << "Parsing failed\n";
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std::cout << "-------------------------\n";
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}
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}
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std::cout << "Bye... :-) \n\n";
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return 0;
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}
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