75 lines
2.3 KiB
C++
75 lines
2.3 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 main purpose of this example is to show how we can generate output from
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// a container holding key/value pairs.
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//
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// For more information see here: http://spirit.sourceforge.net/home/?p=400
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#include <boost/config/warning_disable.hpp>
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#include <boost/spirit/include/karma.hpp>
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#include <boost/spirit/include/karma_stream.hpp>
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#include <boost/spirit/include/phoenix.hpp>
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#include <boost/fusion/include/std_pair.hpp>
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#include <iostream>
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#include <map>
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#include <algorithm>
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#include <cstdlib>
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namespace client
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{
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namespace karma = boost::spirit::karma;
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typedef std::pair<std::string, boost::optional<std::string> > pair_type;
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template <typename OutputIterator>
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struct keys_and_values
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: karma::grammar<OutputIterator, std::vector<pair_type>()>
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{
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keys_and_values()
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: keys_and_values::base_type(query)
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{
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query = pair << *('&' << pair);
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pair = karma::string << -('=' << karma::string);
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}
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karma::rule<OutputIterator, std::vector<pair_type>()> query;
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karma::rule<OutputIterator, pair_type()> pair;
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};
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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::vector<client::pair_type>::value_type value_type;
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typedef std::back_insert_iterator<std::string> sink_type;
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std::vector<client::pair_type> v;
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v.push_back(value_type("key1", boost::optional<std::string>("value1")));
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v.push_back(value_type("key2", boost::optional<std::string>()));
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v.push_back(value_type("key3", boost::optional<std::string>("")));
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std::string generated;
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sink_type sink(generated);
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client::keys_and_values<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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