| /*============================================================================= |
| Copyright (c) 2002-2015 Joel de Guzman |
| |
| Distributed under the Boost Software License, Version 1.0. (See accompanying |
| file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
| =============================================================================*/ |
| /////////////////////////////////////////////////////////////////////////////// |
| // |
| // A parser for arbitrary tuples. This example presents a parser |
| // for an employee structure. |
| // |
| // [ JDG May 9, 2007 ] |
| // [ JDG May 13, 2015 ] spirit X3 |
| // |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| #include <boost/config/warning_disable.hpp> |
| #include <boost/spirit/home/x3.hpp> |
| #include <boost/fusion/include/adapt_struct.hpp> |
| #include <boost/fusion/include/io.hpp> |
| |
| #include <iostream> |
| #include <string> |
| |
| namespace client { namespace ast |
| { |
| /////////////////////////////////////////////////////////////////////////// |
| // Our employee struct |
| /////////////////////////////////////////////////////////////////////////// |
| struct employee |
| { |
| int age; |
| std::string forename; |
| std::string surname; |
| double salary; |
| }; |
| |
| using boost::fusion::operator<<; |
| }} |
| |
| // We need to tell fusion about our employee struct |
| // to make it a first-class fusion citizen. This has to |
| // be in global scope. |
| |
| BOOST_FUSION_ADAPT_STRUCT(client::ast::employee, |
| age, forename, surname, salary |
| ) |
| |
| namespace client |
| { |
| /////////////////////////////////////////////////////////////////////////////// |
| // Our employee parser |
| /////////////////////////////////////////////////////////////////////////////// |
| namespace parser |
| { |
| namespace x3 = boost::spirit::x3; |
| namespace ascii = boost::spirit::x3::ascii; |
| |
| using x3::int_; |
| using x3::lit; |
| using x3::double_; |
| using x3::lexeme; |
| using ascii::char_; |
| |
| x3::rule<class employee, ast::employee> const employee = "employee"; |
| |
| auto const quoted_string = lexeme['"' >> +(char_ - '"') >> '"']; |
| |
| auto const employee_def = |
| lit("employee") |
| >> '{' |
| >> int_ >> ',' |
| >> quoted_string >> ',' |
| >> quoted_string >> ',' |
| >> double_ |
| >> '}' |
| ; |
| |
| BOOST_SPIRIT_DEFINE(employee); |
| } |
| } |
| |
| //////////////////////////////////////////////////////////////////////////// |
| // Main program |
| //////////////////////////////////////////////////////////////////////////// |
| int |
| main() |
| { |
| std::cout << "/////////////////////////////////////////////////////////\n\n"; |
| std::cout << "\t\tAn employee parser for Spirit...\n\n"; |
| std::cout << "/////////////////////////////////////////////////////////\n\n"; |
| |
| std::cout |
| << "Give me an employee of the form :" |
| << "employee{age, \"forename\", \"surname\", salary } \n"; |
| std::cout << "Type [q or Q] to quit\n\n"; |
| |
| using boost::spirit::x3::ascii::space; |
| typedef std::string::const_iterator iterator_type; |
| using client::parser::employee; |
| |
| std::string str; |
| while (getline(std::cin, str)) |
| { |
| if (str.empty() || str[0] == 'q' || str[0] == 'Q') |
| break; |
| |
| client::ast::employee emp; |
| iterator_type iter = str.begin(); |
| iterator_type const end = str.end(); |
| bool r = phrase_parse(iter, end, employee, space, emp); |
| |
| if (r && iter == end) |
| { |
| std::cout << boost::fusion::tuple_open('['); |
| std::cout << boost::fusion::tuple_close(']'); |
| std::cout << boost::fusion::tuple_delimiter(", "); |
| |
| std::cout << "-------------------------\n"; |
| std::cout << "Parsing succeeded\n"; |
| std::cout << "got: " << emp << std::endl; |
| std::cout << "\n-------------------------\n"; |
| } |
| else |
| { |
| std::cout << "-------------------------\n"; |
| std::cout << "Parsing failed\n"; |
| std::cout << "-------------------------\n"; |
| } |
| } |
| |
| std::cout << "Bye... :-) \n\n"; |
| return 0; |
| } |