71 lines
2.0 KiB
C++
71 lines
2.0 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 demonstrate how to utilize alternatives
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// and the built in matching capabilities of Karma generators to emit output
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// in different formats based on the content of an attribute (not its type).
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#include <boost/config/warning_disable.hpp>
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#include <string>
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#include <vector>
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#include <boost/spirit/include/karma.hpp>
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#include <boost/spirit/include/phoenix_stl.hpp>
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namespace client
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{
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namespace karma = boost::spirit::karma;
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namespace phx = boost::phoenix;
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template <typename OutputIterator>
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struct quoted_strings
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: karma::grammar<OutputIterator, std::vector<std::string>()>
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{
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quoted_strings()
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: quoted_strings::base_type(strings)
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{
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strings = (bareword | qstring) % ' ';
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bareword = karma::repeat(phx::size(karma::_val))
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[ karma::alnum | karma::char_("-.,_$") ];
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qstring = '"' << karma::string << '"';
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}
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karma::rule<OutputIterator, std::vector<std::string>()> strings;
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karma::rule<OutputIterator, std::string()> bareword, qstring;
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};
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}
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int main()
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{
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namespace karma = boost::spirit::karma;
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typedef std::back_insert_iterator<std::string> sink_type;
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std::string generated;
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sink_type sink(generated);
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std::vector<std::string> v;
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v.push_back("foo");
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v.push_back("bar baz");
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v.push_back("hello");
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client::quoted_strings<sink_type> g;
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if (!karma::generate(sink, g, v))
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{
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std::cout << "-------------------------\n";
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std::cout << "Generating failed\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 << "Generated: " << generated << "\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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