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- // Copyright (c) 2010 Peter Schueller
- // Copyright (c) 2001-2010 Hartmut Kaiser
- //
- // 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)
- #include <boost/config/warning_disable.hpp>
- #include <boost/detail/lightweight_test.hpp>
- #include <vector>
- #include <istream>
- #include <sstream>
- #include <iostream>
- #include <boost/spirit/include/qi.hpp>
- #include <boost/spirit/include/support_multi_pass.hpp>
- namespace qi = boost::spirit::qi;
- namespace ascii = boost::spirit::ascii;
- std::vector<double> parse(std::istream& input)
- {
- // iterate over stream input
- typedef std::istreambuf_iterator<char> base_iterator_type;
- base_iterator_type in_begin(input);
- // convert input iterator to forward iterator, usable by spirit parser
- typedef boost::spirit::multi_pass<base_iterator_type> forward_iterator_type;
- forward_iterator_type fwd_begin = boost::spirit::make_default_multi_pass(in_begin);
- forward_iterator_type fwd_end;
- // prepare output
- std::vector<double> output;
- // parse
- bool r = qi::phrase_parse(
- fwd_begin, fwd_end, // iterators over input
- qi::double_ >> *(',' >> qi::double_) >> qi::eoi, // recognize list of doubles
- ascii::space | '#' >> *(ascii::char_ - qi::eol) >> qi::eol, // comment skipper
- output); // doubles are stored into this object
- // error detection
- if( !r || fwd_begin != fwd_end )
- throw std::runtime_error("parse error");
- // return result
- return output;
- }
- int main()
- {
- try {
- std::stringstream str("1.0,2.0\n");
- std::vector<double> values = parse(str);
- BOOST_TEST(values.size() == 2 && values[0] == 1.0 && values[1] == 2.0);
- }
- catch(std::exception const&) {
- BOOST_TEST(false);
- }
- return boost::report_errors();
- }
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