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