52 lines
1.7 KiB
C++
52 lines
1.7 KiB
C++
// Copyright (c) 2001-2010 Hartmut Kaiser
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//
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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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// The purpose of this example is to show how a simple custom primitive parser
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// component can be written. We develop a custom parser exposing the current
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// iterator position as its attribute.
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//
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// For more information see: http://spirit.sourceforge.net/home/?page_id=567
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#include <boost/spirit/include/qi_parse_attr.hpp>
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#include <boost/spirit/include/qi_char.hpp>
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#include <boost/spirit/include/qi_operator.hpp>
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#include <boost/spirit/repository/include/qi_iter_pos.hpp>
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#include <string>
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namespace qi = boost::spirit::qi;
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int main()
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{
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using boost::spirit::repository::qi::iter_pos;
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std::string prefix, suffix; // attributes receiving the
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std::string::iterator position; // parsed values
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std::string input("prefix1234567");
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std::string::iterator first = input.begin();
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bool result =
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qi::parse(first, input.end()
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, +qi::alpha >> iter_pos >> +qi::digit
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, prefix, position, suffix);
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if (result)
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{
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std::cout << "-------------------------------- \n";
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std::cout << "Parsing succeeded\n";
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std::cout << "prefix is: " << prefix << "\n";
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std::cout << "suffix is: " << suffix << "\n";
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std::cout << "position is: " << std::distance(input.begin(), position) << "\n";
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std::cout << "-------------------------------- \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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return 0;
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}
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