| /*============================================================================= |
| Copyright (c) 2002-2003 Joel de Guzman |
| http://spirit.sourceforge.net/ |
| |
| Use, modification and distribution is subject to 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) |
| =============================================================================*/ |
| /////////////////////////////////////////////////////////////////////////////// |
| // |
| // This sample demontrates a parser for a comma separated list of identifiers |
| // This is a variation of stuff_vector.cpp. |
| // This is discussed in the "Phoenix" chapter in the Spirit User's Guide. |
| // |
| // [ JDG 1/12/2004 ] |
| // |
| /////////////////////////////////////////////////////////////////////////////// |
| #include <boost/spirit/include/classic_core.hpp> |
| #include <boost/spirit/include/classic_operators.hpp> |
| #include <boost/spirit/include/phoenix1_functions.hpp> |
| #include <boost/spirit/include/phoenix1_primitives.hpp> |
| #include <boost/spirit/include/phoenix1_casts.hpp> |
| #include <iostream> |
| #include <string> |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| using namespace std; |
| using namespace BOOST_SPIRIT_CLASSIC_NS; |
| using namespace phoenix; |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| // |
| // Our comma separated list parser |
| // |
| /////////////////////////////////////////////////////////////////////////////// |
| struct push_back_impl |
| { |
| template <typename Container, typename Item> |
| struct result |
| { |
| typedef void type; |
| }; |
| |
| template <typename Container, typename Item> |
| void operator()(Container& c, Item const& item) const |
| { |
| c.push_back(item); |
| } |
| }; |
| |
| function<push_back_impl> const push_back = push_back_impl(); |
| |
| bool |
| parse_identifiers(char const* str, vector<std::string>& v) |
| { |
| return parse(str, |
| |
| // Begin grammar |
| ( |
| (+alpha_p) |
| [ |
| push_back(var(v), construct_<std::string>(arg1, arg2)) |
| ] |
| >> |
| *(',' >> |
| (+alpha_p) |
| [ |
| push_back(var(v), construct_<std::string>(arg1, arg2)) |
| ] |
| ) |
| ) |
| , |
| // End grammar |
| |
| space_p).full; |
| } |
| |
| //////////////////////////////////////////////////////////////////////////// |
| // |
| // Main program |
| // |
| //////////////////////////////////////////////////////////////////////////// |
| int |
| main() |
| { |
| cout << "/////////////////////////////////////////////////////////\n\n"; |
| cout << "\t\tA comma separated list parser for Spirit...\n\n"; |
| cout << "/////////////////////////////////////////////////////////\n\n"; |
| |
| cout << "Give me a comma separated list of identifiers.\n"; |
| cout << "An identifier is comprised of one or more alphabetic characters.\n"; |
| cout << "The identifiers will be inserted in a vector of numbers\n"; |
| cout << "Type [q or Q] to quit\n\n"; |
| |
| string str; |
| while (getline(cin, str)) |
| { |
| if (str.empty() || str[0] == 'q' || str[0] == 'Q') |
| break; |
| |
| vector<std::string> v; |
| if (parse_identifiers(str.c_str(), v)) |
| { |
| cout << "-------------------------\n"; |
| cout << "Parsing succeeded\n"; |
| cout << str << " Parses OK: " << endl; |
| |
| for (vector<std::string>::size_type i = 0; i < v.size(); ++i) |
| cout << i << ": " << v[i] << endl; |
| |
| cout << "-------------------------\n"; |
| } |
| else |
| { |
| cout << "-------------------------\n"; |
| cout << "Parsing failed\n"; |
| cout << "-------------------------\n"; |
| } |
| } |
| |
| cout << "Bye... :-) \n\n"; |
| return 0; |
| } |
| |
| |